* [Tarantool-patches] [PATCH luajit 0/2] Fixes in Mach-O generation code
@ 2024-07-05 13:10 Sergey Bronnikov via Tarantool-patches
2024-07-05 13:10 ` [Tarantool-patches] [PATCH luajit 1/2] Fix typo Sergey Bronnikov via Tarantool-patches
` (2 more replies)
0 siblings, 3 replies; 12+ messages in thread
From: Sergey Bronnikov via Tarantool-patches @ 2024-07-05 13:10 UTC (permalink / raw)
To: tarantool-patches, Sergey Kaplun, Maxim Kokryashkin
From: Sergey Bronnikov <sergeyb@tarantool.org>
Patch series brings two patches with fixes in <jit/bcsave.lua>.
Branch: https://github.com/tarantool/luajit/tree/ligurio/gh-1181-64bit-non-FAT-Mach-O-object-files
Issues:
- https://github.com/tarantool/tarantool/issues/10199
- https://github.com/LuaJIT/LuaJIT/issues/1181
- https://github.com/LuaJIT/LuaJIT/issues/1223
Mike Pall (2):
Fix typo.
OSX/iOS: Always generate 64 bit non-FAT Mach-O object files.
src/jit/bcsave.lua | 157 +++-------
...-865-cross-generation-mach-o-file.test.lua | 294 +++---------------
2 files changed, 71 insertions(+), 380 deletions(-)
--
2.34.1
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Tarantool-patches] [PATCH luajit 1/2] Fix typo.
2024-07-05 13:10 [Tarantool-patches] [PATCH luajit 0/2] Fixes in Mach-O generation code Sergey Bronnikov via Tarantool-patches
@ 2024-07-05 13:10 ` Sergey Bronnikov via Tarantool-patches
2024-07-09 12:15 ` Sergey Kaplun via Tarantool-patches
2024-07-11 9:15 ` Maxim Kokryashkin via Tarantool-patches
2024-07-05 13:10 ` [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files Sergey Bronnikov via Tarantool-patches
2024-10-18 15:06 ` [Tarantool-patches] [PATCH luajit 0/2] Fixes in Mach-O generation code Sergey Kaplun via Tarantool-patches
2 siblings, 2 replies; 12+ messages in thread
From: Sergey Bronnikov via Tarantool-patches @ 2024-07-05 13:10 UTC (permalink / raw)
To: tarantool-patches, Sergey Kaplun, Maxim Kokryashkin
Reported by Sergey Bronnikov.
(cherry picked from commit 0f8b878e2f3ea280648fc04309c5527cf261bfc8)
Part of tarantool/tarantool#10199
---
src/jit/bcsave.lua | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/jit/bcsave.lua b/src/jit/bcsave.lua
index 069cf1a3..26ec29c6 100644
--- a/src/jit/bcsave.lua
+++ b/src/jit/bcsave.lua
@@ -571,7 +571,7 @@ typedef struct {
o.sym_entry.strx = 1
ffi.copy(o.space+1, symname)
- -- Write Macho-O object file.
+ -- Write Mach-O object file.
local fp = savefile(output, "wb")
fp:write(ffi.string(o, mach_size))
bcsave_tail(fp, output, s)
--
2.34.1
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files.
2024-07-05 13:10 [Tarantool-patches] [PATCH luajit 0/2] Fixes in Mach-O generation code Sergey Bronnikov via Tarantool-patches
2024-07-05 13:10 ` [Tarantool-patches] [PATCH luajit 1/2] Fix typo Sergey Bronnikov via Tarantool-patches
@ 2024-07-05 13:10 ` Sergey Bronnikov via Tarantool-patches
2024-07-09 13:03 ` Sergey Kaplun via Tarantool-patches
2024-10-18 15:06 ` [Tarantool-patches] [PATCH luajit 0/2] Fixes in Mach-O generation code Sergey Kaplun via Tarantool-patches
2 siblings, 1 reply; 12+ messages in thread
From: Sergey Bronnikov via Tarantool-patches @ 2024-07-05 13:10 UTC (permalink / raw)
To: tarantool-patches, Sergey Kaplun, Maxim Kokryashkin
Reported by Sergey Bronnikov.
(cherry picked from commit 7110b935672489afd6ba3eef3e5139d2f3bd05b6)
Previously, LuaJIT generated Mach-O FAT object files for ARM and
ARM64 on macOS. The patch removes support of 32-bit ARM and
FAT object files and now LuaJIT generate Mach-O object files for
ARM64.
Sergey Bronnikov:
* added the description and the trimmed the test for the problem
Part of tarantool/tarantool#10199
---
src/jit/bcsave.lua | 155 ++-------
...-865-cross-generation-mach-o-file.test.lua | 294 +++---------------
2 files changed, 70 insertions(+), 379 deletions(-)
diff --git a/src/jit/bcsave.lua b/src/jit/bcsave.lua
index 26ec29c6..61953c2d 100644
--- a/src/jit/bcsave.lua
+++ b/src/jit/bcsave.lua
@@ -412,24 +412,12 @@ typedef struct
{
mach_header; uint32_t reserved;
} mach_header_64;
-typedef struct {
- uint32_t cmd, cmdsize;
- char segname[16];
- uint32_t vmaddr, vmsize, fileoff, filesize;
- uint32_t maxprot, initprot, nsects, flags;
-} mach_segment_command;
typedef struct {
uint32_t cmd, cmdsize;
char segname[16];
uint64_t vmaddr, vmsize, fileoff, filesize;
uint32_t maxprot, initprot, nsects, flags;
} mach_segment_command_64;
-typedef struct {
- char sectname[16], segname[16];
- uint32_t addr, size;
- uint32_t offset, align, reloff, nreloc, flags;
- uint32_t reserved1, reserved2;
-} mach_section;
typedef struct {
char sectname[16], segname[16];
uint64_t addr, size;
@@ -439,133 +427,58 @@ typedef struct {
typedef struct {
uint32_t cmd, cmdsize, symoff, nsyms, stroff, strsize;
} mach_symtab_command;
-typedef struct {
- int32_t strx;
- uint8_t type, sect;
- int16_t desc;
- uint32_t value;
-} mach_nlist;
typedef struct {
int32_t strx;
uint8_t type, sect;
uint16_t desc;
uint64_t value;
} mach_nlist_64;
-typedef struct
-{
- int32_t magic, nfat_arch;
-} mach_fat_header;
-typedef struct
-{
- int32_t cputype, cpusubtype, offset, size, align;
-} mach_fat_arch;
-typedef struct {
- struct {
- mach_header hdr;
- mach_segment_command seg;
- mach_section sec;
- mach_symtab_command sym;
- } arch[1];
- mach_nlist sym_entry;
- uint8_t space[4096];
-} mach_obj;
typedef struct {
- struct {
- mach_header_64 hdr;
- mach_segment_command_64 seg;
- mach_section_64 sec;
- mach_symtab_command sym;
- } arch[1];
+ mach_header_64 hdr;
+ mach_segment_command_64 seg;
+ mach_section_64 sec;
+ mach_symtab_command sym;
mach_nlist_64 sym_entry;
uint8_t space[4096];
} mach_obj_64;
-typedef struct {
- mach_fat_header fat;
- mach_fat_arch fat_arch[2];
- struct {
- mach_header hdr;
- mach_segment_command seg;
- mach_section sec;
- mach_symtab_command sym;
- } arch[2];
- mach_nlist sym_entry;
- uint8_t space[4096];
-} mach_fat_obj;
-typedef struct {
- mach_fat_header fat;
- mach_fat_arch fat_arch[2];
- struct {
- mach_header_64 hdr;
- mach_segment_command_64 seg;
- mach_section_64 sec;
- mach_symtab_command sym;
- } arch[2];
- mach_nlist_64 sym_entry;
- uint8_t space[4096];
-} mach_fat_obj_64;
]]
local symname = '_'..LJBC_PREFIX..ctx.modname
- local isfat, is64, align, mobj = false, false, 4, "mach_obj"
- if ctx.arch == "x64" then
- is64, align, mobj = true, 8, "mach_obj_64"
- elseif ctx.arch == "arm" then
- isfat, mobj = true, "mach_fat_obj"
- elseif ctx.arch == "arm64" then
- is64, align, isfat, mobj = true, 8, true, "mach_fat_obj_64"
- else
- check(ctx.arch == "x86", "unsupported architecture for OSX")
+ local cputype, cpusubtype = 0x01000007, 3
+ if ctx.arch ~= "x64" then
+ check(ctx.arch == "arm64", "unsupported architecture for OSX")
+ cputype, cpusubtype = 0x0100000c, 0
end
local function aligned(v, a) return bit.band(v+a-1, -a) end
- local be32 = bit.bswap -- Mach-O FAT is BE, supported archs are LE.
-- Create Mach-O object and fill in header.
- local o = ffi.new(mobj)
- local mach_size = aligned(ffi.offsetof(o, "space")+#symname+2, align)
- local cputype = ({ x86={7}, x64={0x01000007}, arm={7,12}, arm64={0x01000007,0x0100000c} })[ctx.arch]
- local cpusubtype = ({ x86={3}, x64={3}, arm={3,9}, arm64={3,0} })[ctx.arch]
- if isfat then
- o.fat.magic = be32(0xcafebabe)
- o.fat.nfat_arch = be32(#cpusubtype)
- end
+ local o = ffi.new("mach_obj_64")
+ local mach_size = aligned(ffi.offsetof(o, "space")+#symname+2, 8)
-- Fill in sections and symbols.
- for i=0,#cpusubtype-1 do
- local ofs = 0
- if isfat then
- local a = o.fat_arch[i]
- a.cputype = be32(cputype[i+1])
- a.cpusubtype = be32(cpusubtype[i+1])
- -- Subsequent slices overlap each other to share data.
- ofs = ffi.offsetof(o, "arch") + i*ffi.sizeof(o.arch[0])
- a.offset = be32(ofs)
- a.size = be32(mach_size-ofs+#s)
- end
- local a = o.arch[i]
- a.hdr.magic = is64 and 0xfeedfacf or 0xfeedface
- a.hdr.cputype = cputype[i+1]
- a.hdr.cpusubtype = cpusubtype[i+1]
- a.hdr.filetype = 1
- a.hdr.ncmds = 2
- a.hdr.sizeofcmds = ffi.sizeof(a.seg)+ffi.sizeof(a.sec)+ffi.sizeof(a.sym)
- a.seg.cmd = is64 and 0x19 or 0x1
- a.seg.cmdsize = ffi.sizeof(a.seg)+ffi.sizeof(a.sec)
- a.seg.vmsize = #s
- a.seg.fileoff = mach_size-ofs
- a.seg.filesize = #s
- a.seg.maxprot = 1
- a.seg.initprot = 1
- a.seg.nsects = 1
- ffi.copy(a.sec.sectname, "__data")
- ffi.copy(a.sec.segname, "__DATA")
- a.sec.size = #s
- a.sec.offset = mach_size-ofs
- a.sym.cmd = 2
- a.sym.cmdsize = ffi.sizeof(a.sym)
- a.sym.symoff = ffi.offsetof(o, "sym_entry")-ofs
- a.sym.nsyms = 1
- a.sym.stroff = ffi.offsetof(o, "sym_entry")+ffi.sizeof(o.sym_entry)-ofs
- a.sym.strsize = aligned(#symname+2, align)
- end
+ o.hdr.magic = 0xfeedfacf
+ o.hdr.cputype = cputype
+ o.hdr.cpusubtype = cpusubtype
+ o.hdr.filetype = 1
+ o.hdr.ncmds = 2
+ o.hdr.sizeofcmds = ffi.sizeof(o.seg)+ffi.sizeof(o.sec)+ffi.sizeof(o.sym)
+ o.seg.cmd = 0x19
+ o.seg.cmdsize = ffi.sizeof(o.seg)+ffi.sizeof(o.sec)
+ o.seg.vmsize = #s
+ o.seg.fileoff = mach_size
+ o.seg.filesize = #s
+ o.seg.maxprot = 1
+ o.seg.initprot = 1
+ o.seg.nsects = 1
+ ffi.copy(o.sec.sectname, "__data")
+ ffi.copy(o.sec.segname, "__DATA")
+ o.sec.size = #s
+ o.sec.offset = mach_size
+ o.sym.cmd = 2
+ o.sym.cmdsize = ffi.sizeof(o.sym)
+ o.sym.symoff = ffi.offsetof(o, "sym_entry")
+ o.sym.nsyms = 1
+ o.sym.stroff = ffi.offsetof(o, "sym_entry")+ffi.sizeof(o.sym_entry)
+ o.sym.strsize = aligned(#symname+2, 8)
o.sym_entry.type = 0xf
o.sym_entry.sect = 1
o.sym_entry.strx = 1
diff --git a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
index f008f3bd..6a58de95 100644
--- a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
+++ b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
@@ -3,109 +3,11 @@ local test = tap.test('lj-865-cross-generation-mach-o-file')
local utils = require('utils')
local ffi = require('ffi')
-test:plan(2)
+test:plan(1)
-- The test creates an object file in Mach-O format with LuaJIT
-- bytecode and checks the validity of the object file fields.
---
--- The original problem is reproduced with LuaJIT, which is built
--- with enabled AVX512F instructions. The support for AVX512F
--- could be checked in `/proc/cpuinfo` on Linux and
--- `sysctl hw.optional.avx512f` on Mac. AVX512F must be
--- implicitly enabled in a C compiler by passing a CPU codename.
--- Please take a look at the GCC Online Documentation [1] for
--- available CPU codenames. Also, see the Wikipedia for CPUs with
--- AVX-512 support [2].
--- Execute command below to detect the CPU codename:
--- `gcc -march=native -Q --help=target | grep march`.
---
--- 1. https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
--- 2. https://en.wikipedia.org/wiki/AVX-512#CPUs_with_AVX-512
---
--- Manual steps for reproducing are the following:
---
--- $ CC=gcc TARGET_CFLAGS='skylake-avx512' cmake -S . -B build
--- $ cmake --build build --parallel
--- $ echo > test.lua
--- $ LUA_PATH="src/?.lua;;" luajit -b -o osx -a arm test.lua test.o
--- $ file test.o
--- empty.o: DOS executable (block device driver)
--- LuaJIT can generate so called Universal Binary with Lua
--- bytecode. The Universal Binary format is a format for
--- executable files that run natively on hardware platforms with
--- different hardware architectures. This concept is more
--- generally known as a fat binary.
---
--- The format of the Mach-O is described in the document
--- "OS X ABI Mach-O File Format Reference", published by Apple
--- company. The copy of the (now removed) official documentation
--- can be found here [1]. Yet another source of truth is
--- XNU headers, see the definition of C-structures in:
--- [2] (`nlist_64`), [3] (`fat_arch` and `fat_header`).
---
--- There is a good visual representation of Universal Binary
--- in "Mac OS X Internals" book (pages 67-68) [5] and in the [6].
--- Below is the schematic structure of Universal Binary, which
--- includes two executables for PowerPC and Intel i386 (omitted):
---
--- 0x0000000 ---------------------------------------
--- |
--- struct | 0xcafebabe FAT_MAGIC magic
--- fat_header | -------------------------------------
--- | 0x00000003 nfat_arch
--- ---------------------------------------
--- | 0x00000012 CPU_TYPE_POWERPC cputype
--- | -------------------------------------
--- | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
--- struct | -------------------------------------
--- fat_arch | 0x00001000 4096 bytes offset
--- | -------------------------------------
--- | 0x00004224 16932 bytes size
--- | -------------------------------------
--- | 0x0000000c 2^12 = 4096 bytes align
--- ---------------------------------------
--- ---------------------------------------
--- | 0x00000007 CPU_TYPE_I386 cputype
--- | -------------------------------------
--- | 0x00000003 CPU_SUBTYPE_I386_ALL cpusubtype
--- struct | -------------------------------------
--- fat_arch | 0x00006000 24576 bytes offset
--- | -------------------------------------
--- | 0x0000292c 10540 bytes size
--- | -------------------------------------
--- | 0x0000000c 2^12 = 4096 bytes align
--- ---------------------------------------
--- Unused
--- 0x00001000 ---------------------------------------
--- | 0xfeedface MH_MAGIC magic
--- | ------------------------------------
--- | 0x00000012 CPU_TYPE_POWERPC cputype
--- | ------------------------------------
--- struct | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
--- mach_header | ------------------------------------
--- | 0x00000002 MH_EXECUTE filetype
--- | ------------------------------------
--- | 0x0000000b 10 load commands ncmds
--- | ------------------------------------
--- | 0x00000574 1396 bytes sizeofcmds
--- | ------------------------------------
--- | 0x00000085 DYLDLINK TWOLEVEL flags
--- --------------------------------------
--- Load commands
--- ---------------------------------------
--- Data
--- ---------------------------------------
---
--- < x86 executable >
---
--- 1. https://github.com/aidansteele/osx-abi-macho-file-format-reference
--- 2. https://github.com/apple-oss-distributions/xnu/blob/xnu-10002.1.13/EXTERNAL_HEADERS/mach-o/nlist.h
--- 3. https://github.com/apple-oss-distributions/xnu/blob/xnu-10002.1.13/EXTERNAL_HEADERS/mach-o/fat.h
--- 4. https://developer.apple.com/documentation/apple-silicon/addressing-architectural-differences-in-your-macos-code
--- 5. https://reverseengineering.stackexchange.com/a/6357/46029
--- 6. http://formats.kaitai.io/mach_o/index.html
---
-- Using the same declarations as defined in <src/jit/bcsave.lua>.
ffi.cdef[[
typedef struct
@@ -118,13 +20,6 @@ typedef struct
mach_header; uint32_t reserved;
} mach_header_64;
-typedef struct {
- uint32_t cmd, cmdsize;
- char segname[16];
- uint32_t vmaddr, vmsize, fileoff, filesize;
- uint32_t maxprot, initprot, nsects, flags;
-} mach_segment_command;
-
typedef struct {
uint32_t cmd, cmdsize;
char segname[16];
@@ -132,13 +27,6 @@ typedef struct {
uint32_t maxprot, initprot, nsects, flags;
} mach_segment_command_64;
-typedef struct {
- char sectname[16], segname[16];
- uint32_t addr, size;
- uint32_t offset, align, reloff, nreloc, flags;
- uint32_t reserved1, reserved2;
-} mach_section;
-
typedef struct {
char sectname[16], segname[16];
uint64_t addr, size;
@@ -150,13 +38,6 @@ typedef struct {
uint32_t cmd, cmdsize, symoff, nsyms, stroff, strsize;
} mach_symtab_command;
-typedef struct {
- int32_t strx;
- uint8_t type, sect;
- int16_t desc;
- uint32_t value;
-} mach_nlist;
-
typedef struct {
int32_t strx;
uint8_t type, sect;
@@ -164,41 +45,14 @@ typedef struct {
uint64_t value;
} mach_nlist_64;
-typedef struct
-{
- int32_t magic, nfat_arch;
-} mach_fat_header;
-
-typedef struct
-{
- int32_t cputype, cpusubtype, offset, size, align;
-} mach_fat_arch;
-
-typedef struct {
- mach_fat_header fat;
- mach_fat_arch fat_arch[2];
- struct {
- mach_header hdr;
- mach_segment_command seg;
- mach_section sec;
- mach_symtab_command sym;
- } arch[2];
- mach_nlist sym_entry;
- uint8_t space[4096];
-} mach_fat_obj;
-
typedef struct {
- mach_fat_header fat;
- mach_fat_arch fat_arch[2];
- struct {
- mach_header_64 hdr;
- mach_segment_command_64 seg;
- mach_section_64 sec;
- mach_symtab_command sym;
- } arch[2];
+ mach_header_64 hdr;
+ mach_segment_command_64 seg;
+ mach_section_64 sec;
+ mach_symtab_command sym;
mach_nlist_64 sym_entry;
uint8_t space[4096];
-} mach_fat_obj_64;
+} mach_obj_64;
]]
local function create_obj_file(name, arch)
@@ -212,108 +66,37 @@ local function create_obj_file(name, arch)
return mach_o_path
end
--- Parses a buffer in the Mach-O format and returns the FAT magic
--- number and `nfat_arch`.
+-- Parses a buffer in the Mach-O format and returns its fields
+-- in a table.
local function read_mach_o(buf, hw_arch)
- local res = {
- header = {
- magic = 0,
- nfat_arch = 0,
- },
- fat_arch = {},
- }
-
local is64 = hw_arch == 'arm64'
- -- Mach-O FAT object.
- local mach_fat_obj_type = ffi.typeof(is64 and
- 'mach_fat_obj_64 *' or
- 'mach_fat_obj *')
- local obj = ffi.cast(mach_fat_obj_type, buf)
+ -- Mach-O object.
+ local mach_obj_type = ffi.typeof(is64 and 'mach_obj_64 *')
+ local obj = ffi.cast(mach_obj_type, buf)
- -- Mach-O FAT object header.
- local mach_fat_header = obj.fat
- -- Mach-O FAT is BE, target arch is LE.
- local be32 = bit.bswap
- res.header.magic = be32(mach_fat_header.magic)
- res.header.nfat_arch = be32(mach_fat_header.nfat_arch)
+ -- Mach-O object header.
+ local mach_header = obj.hdr
- -- Mach-O FAT object arches.
- for i = 0, res.header.nfat_arch - 1 do
- local fat_arch = obj.fat_arch[i]
- local arch = {
- cputype = be32(fat_arch.cputype),
- cpusubtype = be32(fat_arch.cpusubtype),
- }
- table.insert(res.fat_arch, arch)
- end
-
- return res
+ return {
+ header = {
+ magic = mach_header.magic,
+ cputype = mach_header.cputype,
+ cpusubtype = mach_header.cpusubtype,
+ filetype = mach_header.filetype,
+ ncmds = mach_header.ncmds,
+ },
+ }
end
--- Universal Binary can contain executables for more than one
--- CPU architecture. For simplicity, the test compares the *sum*
--- of CPU types and CPU subtypes.
---
--- <src/jit/bcsave.lua:bcsave_machobj> has the definitions of the
--- numbers below. The original XNU source code may be found in
--- <osfmk/mach/machine.h> [1].
---
--- 1. https://opensource.apple.com/source/xnu/xnu-4570.41.2/osfmk/mach/machine.h.auto.html
---
-local SUM_CPUTYPE = {
- -- x86 + arm.
- arm = 7 + 12,
- -- x64 + arm64.
- arm64 = 0x01000007 + 0x0100000c,
-}
-local SUM_CPUSUBTYPE = {
- -- x86 + arm.
- arm = 3 + 9,
- -- x64 + arm64.
- arm64 = 3 + 0,
-}
-
--- The function builds Mach-O FAT object file and retrieves
--- its header fields (magic and nfat_arch) and fields of each arch
--- (cputype, cpusubtype).
---
--- The Mach-O FAT object header can be retrieved with `otool` on
--- macOS:
---
--- $ otool -f empty.o
--- Fat headers
--- fat_magic 0xcafebabe
--- nfat_arch 2
--- <snipped>
---
--- CPU type and subtype can be retrieved with `lipo` on macOS:
---
--- $ luajit -b -o osx -a arm empty.lua empty.o
--- $ lipo -archs empty.o
--- i386 armv7
--- $ luajit -b -o osx -a arm64 empty.lua empty.o
--- $ lipo -archs empty.o
--- x86_64 arm64
+-- The function builds Mach-O object file and retrieves
+-- its header fields.
local function build_and_check_mach_o(subtest)
local hw_arch = subtest.name
- assert(hw_arch == 'arm' or hw_arch == 'arm64')
+ -- LuaJIT always generate 64-bit non-FAT Mach-O object files.
+ assert(hw_arch == 'arm64')
- subtest:plan(4)
- -- FAT_MAGIC is an integer containing the value 0xCAFEBABE in
- -- big-endian byte order format. On a big-endian host CPU,
- -- this can be validated using the constant FAT_MAGIC;
- -- on a little-endian host CPU, it can be validated using
- -- the constant FAT_CIGAM.
- --
- -- FAT_NARCH is an integer specifying the number of fat_arch
- -- data structures that follow. This is the number of
- -- architectures contained in this binary.
- --
- -- See the aforementioned "OS X ABI Mach-O File Format
- -- Reference".
- local FAT_MAGIC = '0xffffffffcafebabe'
- local FAT_NARCH = 2
+ subtest:plan(5)
local MODULE_NAME = 'lango_team'
@@ -327,24 +110,19 @@ local function build_and_check_mach_o(subtest)
assert(os.remove(mach_o_obj_path), 'remove an object file')
local magic_str = string.format('%#x', mach_o.header.magic)
- subtest:is(magic_str, FAT_MAGIC,
- 'fat_magic is correct in Mach-O')
- subtest:is(mach_o.header.nfat_arch, FAT_NARCH,
- 'nfat_arch is correct in Mach-O')
-
- local total_cputype = 0
- local total_cpusubtype = 0
- for i = 1, FAT_NARCH do
- total_cputype = total_cputype + mach_o.fat_arch[i].cputype
- total_cpusubtype = total_cpusubtype + mach_o.fat_arch[i].cpusubtype
- end
- subtest:is(total_cputype, SUM_CPUTYPE[hw_arch],
+ subtest:is(magic_str, '0xfeedfacf',
+ 'magic is correct in Mach-O')
+ local cputype_str = string.format('%#x', mach_o.header.cputype)
+ subtest:is(cputype_str, '0x100000c',
'cputype is correct in Mach-O')
- subtest:is(total_cpusubtype, SUM_CPUSUBTYPE[hw_arch],
+ subtest:is(mach_o.header.cpusubtype, 0,
'cpusubtype is correct in Mach-O')
+ subtest:is(mach_o.header.filetype, 1,
+ 'filetype is correct in Mach-O')
+ subtest:is(mach_o.header.ncmds, 2,
+ 'ncmds is correct in Mach-O')
end
-test:test('arm', build_and_check_mach_o)
test:test('arm64', build_and_check_mach_o)
test:done(true)
--
2.34.1
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [Tarantool-patches] [PATCH luajit 1/2] Fix typo.
2024-07-05 13:10 ` [Tarantool-patches] [PATCH luajit 1/2] Fix typo Sergey Bronnikov via Tarantool-patches
@ 2024-07-09 12:15 ` Sergey Kaplun via Tarantool-patches
2024-07-11 9:15 ` Maxim Kokryashkin via Tarantool-patches
1 sibling, 0 replies; 12+ messages in thread
From: Sergey Kaplun via Tarantool-patches @ 2024-07-09 12:15 UTC (permalink / raw)
To: Sergey Bronnikov; +Cc: tarantool-patches
Hi, Sergey!
Thanks for the patch!
LGTM!
--
Best regards,
Sergey Kaplun
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files.
2024-07-05 13:10 ` [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files Sergey Bronnikov via Tarantool-patches
@ 2024-07-09 13:03 ` Sergey Kaplun via Tarantool-patches
2024-07-10 12:43 ` Sergey Bronnikov via Tarantool-patches
0 siblings, 1 reply; 12+ messages in thread
From: Sergey Kaplun via Tarantool-patches @ 2024-07-09 13:03 UTC (permalink / raw)
To: Sergey Bronnikov; +Cc: tarantool-patches
Hi, Sergey!
Thanks for the patch!
Please consider my comments below.
May we add the test [1] to verify that there will be no regression in the
future?
On 05.07.24, Sergey Bronnikov wrote:
> Reported by Sergey Bronnikov.
>
> (cherry picked from commit 7110b935672489afd6ba3eef3e5139d2f3bd05b6)
>
> Previously, LuaJIT generated Mach-O FAT object files for ARM and
> ARM64 on macOS. The patch removes support of 32-bit ARM and
> FAT object files and now LuaJIT generate Mach-O object files for
> ARM64.
I suppose we should mention that no x86/x86_64 objects are generated
now.
>
> Sergey Bronnikov:
> * added the description and the trimmed the test for the problem
>
> Part of tarantool/tarantool#10199
> ---
> src/jit/bcsave.lua | 155 ++-------
> ...-865-cross-generation-mach-o-file.test.lua | 294 +++---------------
> 2 files changed, 70 insertions(+), 379 deletions(-)
>
> diff --git a/src/jit/bcsave.lua b/src/jit/bcsave.lua
> index 26ec29c6..61953c2d 100644
> --- a/src/jit/bcsave.lua
> +++ b/src/jit/bcsave.lua
<snipped>
> diff --git a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
> index f008f3bd..6a58de95 100644
> --- a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
> +++ b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
> @@ -3,109 +3,11 @@ local test = tap.test('lj-865-cross-generation-mach-o-file')
> local utils = require('utils')
> local ffi = require('ffi')
>
> -test:plan(2)
> +test:plan(1)
>
> -- The test creates an object file in Mach-O format with LuaJIT
> -- bytecode and checks the validity of the object file fields.
> ---
> --- The original problem is reproduced with LuaJIT, which is built
> --- with enabled AVX512F instructions. The support for AVX512F
> --- could be checked in `/proc/cpuinfo` on Linux and
> --- `sysctl hw.optional.avx512f` on Mac. AVX512F must be
> --- implicitly enabled in a C compiler by passing a CPU codename.
> --- Please take a look at the GCC Online Documentation [1] for
> --- available CPU codenames. Also, see the Wikipedia for CPUs with
> --- AVX-512 support [2].
> --- Execute command below to detect the CPU codename:
> --- `gcc -march=native -Q --help=target | grep march`.
> ---
> --- 1. https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
> --- 2. https://en.wikipedia.org/wiki/AVX-512#CPUs_with_AVX-512
> ---
> --- Manual steps for reproducing are the following:
> ---
> --- $ CC=gcc TARGET_CFLAGS='skylake-avx512' cmake -S . -B build
> --- $ cmake --build build --parallel
> --- $ echo > test.lua
> --- $ LUA_PATH="src/?.lua;;" luajit -b -o osx -a arm test.lua test.o
> --- $ file test.o
> --- empty.o: DOS executable (block device driver)
>
> --- LuaJIT can generate so called Universal Binary with Lua
> --- bytecode. The Universal Binary format is a format for
> --- executable files that run natively on hardware platforms with
> --- different hardware architectures. This concept is more
> --- generally known as a fat binary.
> ---
> --- The format of the Mach-O is described in the document
> --- "OS X ABI Mach-O File Format Reference", published by Apple
> --- company. The copy of the (now removed) official documentation
> --- can be found here [1]. Yet another source of truth is
> --- XNU headers, see the definition of C-structures in:
> --- [2] (`nlist_64`), [3] (`fat_arch` and `fat_header`).
> ---
> --- There is a good visual representation of Universal Binary
> --- in "Mac OS X Internals" book (pages 67-68) [5] and in the [6].
> --- Below is the schematic structure of Universal Binary, which
> --- includes two executables for PowerPC and Intel i386 (omitted):
> ---
> --- 0x0000000 ---------------------------------------
> --- |
> --- struct | 0xcafebabe FAT_MAGIC magic
> --- fat_header | -------------------------------------
> --- | 0x00000003 nfat_arch
> --- ---------------------------------------
> --- | 0x00000012 CPU_TYPE_POWERPC cputype
> --- | -------------------------------------
> --- | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
> --- struct | -------------------------------------
> --- fat_arch | 0x00001000 4096 bytes offset
> --- | -------------------------------------
> --- | 0x00004224 16932 bytes size
> --- | -------------------------------------
> --- | 0x0000000c 2^12 = 4096 bytes align
> --- ---------------------------------------
> --- ---------------------------------------
> --- | 0x00000007 CPU_TYPE_I386 cputype
> --- | -------------------------------------
> --- | 0x00000003 CPU_SUBTYPE_I386_ALL cpusubtype
> --- struct | -------------------------------------
> --- fat_arch | 0x00006000 24576 bytes offset
> --- | -------------------------------------
> --- | 0x0000292c 10540 bytes size
> --- | -------------------------------------
> --- | 0x0000000c 2^12 = 4096 bytes align
> --- ---------------------------------------
> --- Unused
> --- 0x00001000 ---------------------------------------
> --- | 0xfeedface MH_MAGIC magic
> --- | ------------------------------------
> --- | 0x00000012 CPU_TYPE_POWERPC cputype
> --- | ------------------------------------
> --- struct | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
> --- mach_header | ------------------------------------
> --- | 0x00000002 MH_EXECUTE filetype
> --- | ------------------------------------
> --- | 0x0000000b 10 load commands ncmds
> --- | ------------------------------------
> --- | 0x00000574 1396 bytes sizeofcmds
> --- | ------------------------------------
> --- | 0x00000085 DYLDLINK TWOLEVEL flags
> --- --------------------------------------
> --- Load commands
> --- ---------------------------------------
> --- Data
> --- ---------------------------------------
> ---
> --- < x86 executable >
> ---
> --- 1. https://github.com/aidansteele/osx-abi-macho-file-format-reference
> --- 2. https://github.com/apple-oss-distributions/xnu/blob/xnu-10002.1.13/EXTERNAL_HEADERS/mach-o/nlist.h
> --- 3. https://github.com/apple-oss-distributions/xnu/blob/xnu-10002.1.13/EXTERNAL_HEADERS/mach-o/fat.h
> --- 4. https://developer.apple.com/documentation/apple-silicon/addressing-architectural-differences-in-your-macos-code
> --- 5. https://reverseengineering.stackexchange.com/a/6357/46029
> --- 6. http://formats.kaitai.io/mach_o/index.html
I prefer to keep the non-FAT part of this comment since it is very
useful.
> ---
> -- Using the same declarations as defined in <src/jit/bcsave.lua>.
> ffi.cdef[[
<snipped>
> local function create_obj_file(name, arch)
> @@ -212,108 +66,37 @@ local function create_obj_file(name, arch)
> return mach_o_path
> end
>
> --- Parses a buffer in the Mach-O format and returns the FAT magic
> --- number and `nfat_arch`.
> +-- Parses a buffer in the Mach-O format and returns its fields
> +-- in a table.
> local function read_mach_o(buf, hw_arch)
I suggest renaming it to `read_mach_o_hdr()` and returning only the
header without any additional wrapping in the table.
> - local res = {
> - header = {
> - magic = 0,
> - nfat_arch = 0,
> - },
> - fat_arch = {},
> - }
> -
> local is64 = hw_arch == 'arm64'
Maybe it is better to use assert here, like we do for the
`build_and_check_mach_o()` routine?
>
> - -- Mach-O FAT object.
> - local mach_fat_obj_type = ffi.typeof(is64 and
> - 'mach_fat_obj_64 *' or
> - 'mach_fat_obj *')
> - local obj = ffi.cast(mach_fat_obj_type, buf)
> + -- Mach-O object.
> + local mach_obj_type = ffi.typeof(is64 and 'mach_obj_64 *')
Maybe just use mach_obj_64 since there is no alternative?
> + local obj = ffi.cast(mach_obj_type, buf)
>
> - -- Mach-O FAT object header.
> - local mach_fat_header = obj.fat
> - -- Mach-O FAT is BE, target arch is LE.
> - local be32 = bit.bswap
> - res.header.magic = be32(mach_fat_header.magic)
> - res.header.nfat_arch = be32(mach_fat_header.nfat_arch)
> + -- Mach-O object header.
> + local mach_header = obj.hdr
>
> - -- Mach-O FAT object arches.
> - for i = 0, res.header.nfat_arch - 1 do
> - local fat_arch = obj.fat_arch[i]
> - local arch = {
> - cputype = be32(fat_arch.cputype),
> - cpusubtype = be32(fat_arch.cpusubtype),
> - }
> - table.insert(res.fat_arch, arch)
> - end
> -
> - return res
> + return {
> + header = {
> + magic = mach_header.magic,
> + cputype = mach_header.cputype,
> + cpusubtype = mach_header.cpusubtype,
> + filetype = mach_header.filetype,
> + ncmds = mach_header.ncmds,
> + },
> + }
> end
>
> --- Universal Binary can contain executables for more than one
> --- CPU architecture. For simplicity, the test compares the *sum*
> --- of CPU types and CPU subtypes.
> ---
> --- <src/jit/bcsave.lua:bcsave_machobj> has the definitions of the
> --- numbers below. The original XNU source code may be found in
> --- <osfmk/mach/machine.h> [1].
> ---
> --- 1. https://opensource.apple.com/source/xnu/xnu-4570.41.2/osfmk/mach/machine.h.auto.html
> ---
> -local SUM_CPUTYPE = {
> - -- x86 + arm.
> - arm = 7 + 12,
> - -- x64 + arm64.
> - arm64 = 0x01000007 + 0x0100000c,
> -}
> -local SUM_CPUSUBTYPE = {
> - -- x86 + arm.
> - arm = 3 + 9,
> - -- x64 + arm64.
> - arm64 = 3 + 0,
> -}
> -
> --- The function builds Mach-O FAT object file and retrieves
> --- its header fields (magic and nfat_arch) and fields of each arch
> --- (cputype, cpusubtype).
> ---
> --- The Mach-O FAT object header can be retrieved with `otool` on
> --- macOS:
> ---
> --- $ otool -f empty.o
> --- Fat headers
> --- fat_magic 0xcafebabe
> --- nfat_arch 2
> --- <snipped>
> ---
> --- CPU type and subtype can be retrieved with `lipo` on macOS:
> ---
> --- $ luajit -b -o osx -a arm empty.lua empty.o
> --- $ lipo -archs empty.o
> --- i386 armv7
> --- $ luajit -b -o osx -a arm64 empty.lua empty.o
> --- $ lipo -archs empty.o
> --- x86_64 arm64
> +-- The function builds Mach-O object file and retrieves
> +-- its header fields.
> local function build_and_check_mach_o(subtest)
> local hw_arch = subtest.name
> - assert(hw_arch == 'arm' or hw_arch == 'arm64')
> + -- LuaJIT always generate 64-bit non-FAT Mach-O object files.
The fact that these files are generated only for M1 CPUs looks worth
mentioning.
> + assert(hw_arch == 'arm64')
>
> - subtest:plan(4)
> - -- FAT_MAGIC is an integer containing the value 0xCAFEBABE in
> - -- big-endian byte order format. On a big-endian host CPU,
> - -- this can be validated using the constant FAT_MAGIC;
> - -- on a little-endian host CPU, it can be validated using
> - -- the constant FAT_CIGAM.
> - --
> - -- FAT_NARCH is an integer specifying the number of fat_arch
> - -- data structures that follow. This is the number of
> - -- architectures contained in this binary.
> - --
> - -- See the aforementioned "OS X ABI Mach-O File Format
> - -- Reference".
The similar comment about Mach-O format will be appretiated.
> - local FAT_MAGIC = '0xffffffffcafebabe'
> - local FAT_NARCH = 2
> + subtest:plan(5)
>
> local MODULE_NAME = 'lango_team'
>
> @@ -327,24 +110,19 @@ local function build_and_check_mach_o(subtest)
> assert(os.remove(mach_o_obj_path), 'remove an object file')
>
> local magic_str = string.format('%#x', mach_o.header.magic)
> - subtest:is(magic_str, FAT_MAGIC,
> - 'fat_magic is correct in Mach-O')
> - subtest:is(mach_o.header.nfat_arch, FAT_NARCH,
> - 'nfat_arch is correct in Mach-O')
> -
> - local total_cputype = 0
> - local total_cpusubtype = 0
> - for i = 1, FAT_NARCH do
> - total_cputype = total_cputype + mach_o.fat_arch[i].cputype
> - total_cpusubtype = total_cpusubtype + mach_o.fat_arch[i].cpusubtype
> - end
> - subtest:is(total_cputype, SUM_CPUTYPE[hw_arch],
> + subtest:is(magic_str, '0xfeedfacf',
Please use MH_MAGIC_64 named constant for this magic string.
> + 'magic is correct in Mach-O')
Looks like this line may be joined with the previous one.
> + local cputype_str = string.format('%#x', mach_o.header.cputype)
> + subtest:is(cputype_str, '0x100000c',
Please use the named constant CPU_TYPE_ARM64 for this magic string.
> 'cputype is correct in Mach-O')
Looks like this line may be joined with the previous one.
> - subtest:is(total_cpusubtype, SUM_CPUSUBTYPE[hw_arch],
> + subtest:is(mach_o.header.cpusubtype, 0,
Please use the named constant CPU_SUBTYPE_ARM64 for this magic constant.
> 'cpusubtype is correct in Mach-O')
Looks like this line may be joined with the previous one.
> + subtest:is(mach_o.header.filetype, 1,
What does the 1 filetype mean?
Please use the named constant.
> + 'filetype is correct in Mach-O')
Looks like this line may be joined with the previous one.
> + subtest:is(mach_o.header.ncmds, 2,
Why there are 2 commands for Mach-O format?
Please use the named constant.
> + 'ncmds is correct in Mach-O')
Looks like this line may be joined with the previous one.
> end
>
> -test:test('arm', build_and_check_mach_o)
> test:test('arm64', build_and_check_mach_o)
>
> test:done(true)
> --
> 2.34.1
>
[1]: https://github.com/LuaJIT/LuaJIT/issues/1181#issue-2202788411
--
Best regards,
Sergey Kaplun
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files.
2024-07-09 13:03 ` Sergey Kaplun via Tarantool-patches
@ 2024-07-10 12:43 ` Sergey Bronnikov via Tarantool-patches
2024-07-11 7:29 ` Sergey Kaplun via Tarantool-patches
0 siblings, 1 reply; 12+ messages in thread
From: Sergey Bronnikov via Tarantool-patches @ 2024-07-10 12:43 UTC (permalink / raw)
To: Sergey Kaplun, Sergey Bronnikov; +Cc: tarantool-patches
[-- Attachment #1: Type: text/plain, Size: 21753 bytes --]
Sergey,
thanks for review. Fixes applied and force-pushed to the same branch.
Sergey
On 09.07.2024 16:03, Sergey Kaplun via Tarantool-patches wrote:
> Hi, Sergey!
> Thanks for the patch!
> Please consider my comments below.
>
> May we add the test [1] to verify that there will be no regression in the
> future?
This "test" was for a FAT binary generated by LuaJIT.
With backported patches, FAT (aka Universal Binary) support is gone.
mach-O header is checked by tests in proposed patch.
>
> On 05.07.24, Sergey Bronnikov wrote:
>> Reported by Sergey Bronnikov.
>>
>> (cherry picked from commit 7110b935672489afd6ba3eef3e5139d2f3bd05b6)
>>
>> Previously, LuaJIT generated Mach-O FAT object files for ARM and
>> ARM64 on macOS. The patch removes support of 32-bit ARM and
>> FAT object files and now LuaJIT generate Mach-O object files for
>> ARM64.
> I suppose we should mention that no x86/x86_64 objects are generated
> now.
x86_64 is still there:
$ ./build/gc64/src/luajit -b -o osx -a arm64 empty.lua empty.o
$ file empty.o
empty.o: Mach-O 64-bit arm64 object
$ ./build/gc64/src/luajit -b -o osx -a x64 empty.lua empty.o
$ file empty.o
empty.o: Mach-O 64-bit x86_64 object
$
Anyway, commit message has been updated.
>> Sergey Bronnikov:
>> * added the description and the trimmed the test for the problem
>>
>> Part of tarantool/tarantool#10199
>> ---
>> src/jit/bcsave.lua | 155 ++-------
>> ...-865-cross-generation-mach-o-file.test.lua | 294 +++---------------
>> 2 files changed, 70 insertions(+), 379 deletions(-)
>>
>> diff --git a/src/jit/bcsave.lua b/src/jit/bcsave.lua
>> index 26ec29c6..61953c2d 100644
>> --- a/src/jit/bcsave.lua
>> +++ b/src/jit/bcsave.lua
> <snipped>
>
>> diff --git a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
>> index f008f3bd..6a58de95 100644
>> --- a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
>> +++ b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
>> @@ -3,109 +3,11 @@ local test = tap.test('lj-865-cross-generation-mach-o-file')
>> local utils = require('utils')
>> local ffi = require('ffi')
>>
>> -test:plan(2)
>> +test:plan(1)
>>
>> -- The test creates an object file in Mach-O format with LuaJIT
>> -- bytecode and checks the validity of the object file fields.
>> ---
>> --- The original problem is reproduced with LuaJIT, which is built
>> --- with enabled AVX512F instructions. The support for AVX512F
>> --- could be checked in `/proc/cpuinfo` on Linux and
>> --- `sysctl hw.optional.avx512f` on Mac. AVX512F must be
>> --- implicitly enabled in a C compiler by passing a CPU codename.
>> --- Please take a look at the GCC Online Documentation [1] for
>> --- available CPU codenames. Also, see the Wikipedia for CPUs with
>> --- AVX-512 support [2].
>> --- Execute command below to detect the CPU codename:
>> --- `gcc -march=native -Q --help=target | grep march`.
>> ---
>> --- 1.https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
>> --- 2.https://en.wikipedia.org/wiki/AVX-512#CPUs_with_AVX-512
>> ---
>> --- Manual steps for reproducing are the following:
>> ---
>> --- $ CC=gcc TARGET_CFLAGS='skylake-avx512' cmake -S . -B build
>> --- $ cmake --build build --parallel
>> --- $ echo > test.lua
>> --- $ LUA_PATH="src/?.lua;;" luajit -b -o osx -a arm test.lua test.o
>> --- $ file test.o
>> --- empty.o: DOS executable (block device driver)
>>
>> --- LuaJIT can generate so called Universal Binary with Lua
>> --- bytecode. The Universal Binary format is a format for
>> --- executable files that run natively on hardware platforms with
>> --- different hardware architectures. This concept is more
>> --- generally known as a fat binary.
>> ---
>> --- The format of the Mach-O is described in the document
>> --- "OS X ABI Mach-O File Format Reference", published by Apple
>> --- company. The copy of the (now removed) official documentation
>> --- can be found here [1]. Yet another source of truth is
>> --- XNU headers, see the definition of C-structures in:
>> --- [2] (`nlist_64`), [3] (`fat_arch` and `fat_header`).
>> ---
>> --- There is a good visual representation of Universal Binary
>> --- in "Mac OS X Internals" book (pages 67-68) [5] and in the [6].
>> --- Below is the schematic structure of Universal Binary, which
>> --- includes two executables for PowerPC and Intel i386 (omitted):
>> ---
>> --- 0x0000000 ---------------------------------------
>> --- |
>> --- struct | 0xcafebabe FAT_MAGIC magic
>> --- fat_header | -------------------------------------
>> --- | 0x00000003 nfat_arch
>> --- ---------------------------------------
>> --- | 0x00000012 CPU_TYPE_POWERPC cputype
>> --- | -------------------------------------
>> --- | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
>> --- struct | -------------------------------------
>> --- fat_arch | 0x00001000 4096 bytes offset
>> --- | -------------------------------------
>> --- | 0x00004224 16932 bytes size
>> --- | -------------------------------------
>> --- | 0x0000000c 2^12 = 4096 bytes align
>> --- ---------------------------------------
>> --- ---------------------------------------
>> --- | 0x00000007 CPU_TYPE_I386 cputype
>> --- | -------------------------------------
>> --- | 0x00000003 CPU_SUBTYPE_I386_ALL cpusubtype
>> --- struct | -------------------------------------
>> --- fat_arch | 0x00006000 24576 bytes offset
>> --- | -------------------------------------
>> --- | 0x0000292c 10540 bytes size
>> --- | -------------------------------------
>> --- | 0x0000000c 2^12 = 4096 bytes align
>> --- ---------------------------------------
>> --- Unused
>> --- 0x00001000 ---------------------------------------
>> --- | 0xfeedface MH_MAGIC magic
>> --- | ------------------------------------
>> --- | 0x00000012 CPU_TYPE_POWERPC cputype
>> --- | ------------------------------------
>> --- struct | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
>> --- mach_header | ------------------------------------
>> --- | 0x00000002 MH_EXECUTE filetype
>> --- | ------------------------------------
>> --- | 0x0000000b 10 load commands ncmds
>> --- | ------------------------------------
>> --- | 0x00000574 1396 bytes sizeofcmds
>> --- | ------------------------------------
>> --- | 0x00000085 DYLDLINK TWOLEVEL flags
>> --- --------------------------------------
>> --- Load commands
>> --- ---------------------------------------
>> --- Data
>> --- ---------------------------------------
>> ---
>> --- < x86 executable >
>> ---
>> --- 1.https://github.com/aidansteele/osx-abi-macho-file-format-reference
>> --- 2.https://github.com/apple-oss-distributions/xnu/blob/xnu-10002.1.13/EXTERNAL_HEADERS/mach-o/nlist.h
>> --- 3.https://github.com/apple-oss-distributions/xnu/blob/xnu-10002.1.13/EXTERNAL_HEADERS/mach-o/fat.h
>> --- 4.https://developer.apple.com/documentation/apple-silicon/addressing-architectural-differences-in-your-macos-code
>> --- 5.https://reverseengineering.stackexchange.com/a/6357/46029
>> --- 6.http://formats.kaitai.io/mach_o/index.html
> I prefer to keep the non-FAT part of this comment since it is very
> useful.
reverted:
diff --git a/build/src/luajit b/build/src/luajit
deleted file mode 100755
index bd10e09a..00000000
Binary files a/build/src/luajit and /dev/null differ
diff --git
a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
index 6a58de95..f9ca6e38 100644
--- a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
+++ b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
@@ -68,6 +68,62 @@ end
-- Parses a buffer in the Mach-O format and returns its fields
-- in a table.
+-- The test creates an object file in Mach-O format with LuaJIT
+-- bytecode and checks the validity of the object file fields.
+---
+--- The original problem is reproduced with LuaJIT, which is built
+--- with enabled AVX512F instructions. The support for AVX512F
+--- could be checked in `/proc/cpuinfo` on Linux and
+--- `sysctl hw.optional.avx512f` on Mac. AVX512F must be
+--- implicitly enabled in a C compiler by passing a CPU codename.
+--- Please take a look at the GCC Online Documentation [1] for
+--- available CPU codenames. Also, see the Wikipedia for CPUs with
+--- AVX-512 support [2].
+--- Execute command below to detect the CPU codename:
+--- `gcc -march=native -Q --help=target | grep march`.
+---
+--- 1. https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
+--- 2. https://en.wikipedia.org/wiki/AVX-512#CPUs_with_AVX-512
+---
+--- Manual steps for reproducing are the following:
+---
+--- $ CC=gcc TARGET_CFLAGS='skylake-avx512' cmake -S . -B build
+--- $ cmake --build build --parallel
+--- $ echo > test.lua
+--- $ LUA_PATH="src/?.lua;;" luajit -b -o osx -a arm test.lua test.o
+--- $ file test.o
+--- empty.o: DOS executable (block device driver)
+
+--- The format of the Mach-O is described in the document
+--- "OS X ABI Mach-O File Format Reference", published by Apple
+--- company. The copy of the (now removed) official documentation
+--- can be found here [1]. There is a good visual representation
+--- of Mach-O format in "Mac OS X Internals" book (pages 67-68)
+--- [2] and in the [3].
+--
+--- 0x0000000 ---------------------------------------
+--- | 0xfeedface MH_MAGIC magic
+--- | ------------------------------------
+--- | 0x00000012 CPU_TYPE_POWERPC cputype
+--- | ------------------------------------
+--- struct | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
+--- mach_header | ------------------------------------
+--- | 0x00000002 MH_EXECUTE filetype
+--- | ------------------------------------
+--- | 0x0000000b 10 load commands ncmds
+--- | ------------------------------------
+--- | 0x00000574 1396 bytes sizeofcmds
+--- | ------------------------------------
+--- | 0x00000085 DYLDLINK TWOLEVEL flags
+--- --------------------------------------
+--- Load commands
+--- ---------------------------------------
+--- Data
+--- ---------------------------------------
+---
+--- 1. https://github.com/aidansteele/osx-abi-macho-file-format-reference
+--- 2. https://reverseengineering.stackexchange.com/a/6357/46029
+--- 3. http://formats.kaitai.io/mach_o/index.html
local function read_mach_o(buf, hw_arch)
local is64 = hw_arch == 'arm64'
>
>> ---
>> -- Using the same declarations as defined in <src/jit/bcsave.lua>.
>> ffi.cdef[[
> <snipped>
>
>> local function create_obj_file(name, arch)
>> @@ -212,108 +66,37 @@ local function create_obj_file(name, arch)
>> return mach_o_path
>> end
>>
>> --- Parses a buffer in the Mach-O format and returns the FAT magic
>> --- number and `nfat_arch`.
>> +-- Parses a buffer in the Mach-O format and returns its fields
>> +-- in a table.
>> local function read_mach_o(buf, hw_arch)
> I suggest renaming it to `read_mach_o_hdr()` and returning only the
> header without any additional wrapping in the table.
Updated:
diff --git a/build/src/luajit b/build/src/luajit
deleted file mode 100755
index bd10e09a..00000000
Binary files a/build/src/luajit and /dev/null differ
diff --git
a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
index 6a58de95..0f269a8c 100644
--- a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
+++ b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
@@ -78,15 +134,7 @@ local function read_mach_o(buf, hw_arch)
-- Mach-O object header.
local mach_header = obj.hdr
- return {
- header = {
- magic = mach_header.magic,
- cputype = mach_header.cputype,
- cpusubtype = mach_header.cpusubtype,
- filetype = mach_header.filetype,
- ncmds = mach_header.ncmds,
- },
- }
+ return mach_header
end
-- The function builds Mach-O object file and retrieves
@@ -104,22 +152,22 @@ local function build_and_check_mach_o(subtest)
local mach_o_buf = utils.tools.read_file(mach_o_obj_path)
assert(mach_o_buf ~= nil and #mach_o_buf ~= 0, 'cannot read an
object file')
- local mach_o = read_mach_o(mach_o_buf, hw_arch)
+ local mach_o = read_mach_o_hdr(mach_o_buf, hw_arch)
-- Teardown.
assert(os.remove(mach_o_obj_path), 'remove an object file')
- local magic_str = string.format('%#x', mach_o.header.magic)
+ local magic_str = string.format('%#x', mach_o.magic)
subtest:is(magic_str, '0xfeedfacf',
'magic is correct in Mach-O')
- local cputype_str = string.format('%#x', mach_o.header.cputype)
+ local cputype_str = string.format('%#x', mach_o.cputype)
subtest:is(cputype_str, '0x100000c',
'cputype is correct in Mach-O')
- subtest:is(mach_o.header.cpusubtype, 0,
+ subtest:is(mach_o.cpusubtype, 0,
'cpusubtype is correct in Mach-O')
- subtest:is(mach_o.header.filetype, 1,
+ subtest:is(mach_o.filetype, 1,
'filetype is correct in Mach-O')
- subtest:is(mach_o.header.ncmds, 2,
+ subtest:is(mach_o.ncmds, 2,
'ncmds is correct in Mach-O')
end
>> - local res = {
>> - header = {
>> - magic = 0,
>> - nfat_arch = 0,
>> - },
>> - fat_arch = {},
>> - }
>> -
>> local is64 = hw_arch == 'arm64'
> Maybe it is better to use assert here, like we do for the
> `build_and_check_mach_o()` routine?
Added, but read_mach_o_hdr is called by build_and_check_mach_o where
assert already added.
>
>>
>> - -- Mach-O FAT object.
>> - local mach_fat_obj_type = ffi.typeof(is64 and
>> - 'mach_fat_obj_64 *' or
>> - 'mach_fat_obj *')
>> - local obj = ffi.cast(mach_fat_obj_type, buf)
>> + -- Mach-O object.
>> + local mach_obj_type = ffi.typeof(is64 and 'mach_obj_64 *')
> Maybe just use mach_obj_64 since there is no alternative?
ok
>> + local obj = ffi.cast(mach_obj_type, buf)
>>
>> - -- Mach-O FAT object header.
>> - local mach_fat_header = obj.fat
>> - -- Mach-O FAT is BE, target arch is LE.
>> - local be32 = bit.bswap
>> - res.header.magic = be32(mach_fat_header.magic)
>> - res.header.nfat_arch = be32(mach_fat_header.nfat_arch)
>> + -- Mach-O object header.
>> + local mach_header = obj.hdr
>>
>> - -- Mach-O FAT object arches.
>> - for i = 0, res.header.nfat_arch - 1 do
>> - local fat_arch = obj.fat_arch[i]
>> - local arch = {
>> - cputype = be32(fat_arch.cputype),
>> - cpusubtype = be32(fat_arch.cpusubtype),
>> - }
>> - table.insert(res.fat_arch, arch)
>> - end
>> -
>> - return res
>> + return {
>> + header = {
>> + magic = mach_header.magic,
>> + cputype = mach_header.cputype,
>> + cpusubtype = mach_header.cpusubtype,
>> + filetype = mach_header.filetype,
>> + ncmds = mach_header.ncmds,
>> + },
>> + }
>> end
>>
>> --- Universal Binary can contain executables for more than one
>> --- CPU architecture. For simplicity, the test compares the *sum*
>> --- of CPU types and CPU subtypes.
>> ---
>> --- <src/jit/bcsave.lua:bcsave_machobj> has the definitions of the
>> --- numbers below. The original XNU source code may be found in
>> --- <osfmk/mach/machine.h> [1].
>> ---
>> --- 1.https://opensource.apple.com/source/xnu/xnu-4570.41.2/osfmk/mach/machine.h.auto.html
>> ---
>> -local SUM_CPUTYPE = {
>> - -- x86 + arm.
>> - arm = 7 + 12,
>> - -- x64 + arm64.
>> - arm64 = 0x01000007 + 0x0100000c,
>> -}
>> -local SUM_CPUSUBTYPE = {
>> - -- x86 + arm.
>> - arm = 3 + 9,
>> - -- x64 + arm64.
>> - arm64 = 3 + 0,
>> -}
>> -
>> --- The function builds Mach-O FAT object file and retrieves
>> --- its header fields (magic and nfat_arch) and fields of each arch
>> --- (cputype, cpusubtype).
>> ---
>> --- The Mach-O FAT object header can be retrieved with `otool` on
>> --- macOS:
>> ---
>> --- $ otool -f empty.o
>> --- Fat headers
>> --- fat_magic 0xcafebabe
>> --- nfat_arch 2
>> --- <snipped>
>> ---
>> --- CPU type and subtype can be retrieved with `lipo` on macOS:
>> ---
>> --- $ luajit -b -o osx -a arm empty.lua empty.o
>> --- $ lipo -archs empty.o
>> --- i386 armv7
>> --- $ luajit -b -o osx -a arm64 empty.lua empty.o
>> --- $ lipo -archs empty.o
>> --- x86_64 arm64
>> +-- The function builds Mach-O object file and retrieves
>> +-- its header fields.
>> local function build_and_check_mach_o(subtest)
>> local hw_arch = subtest.name
>> - assert(hw_arch == 'arm' or hw_arch == 'arm64')
>> + -- LuaJIT always generate 64-bit non-FAT Mach-O object files.
> The fact that these files are generated only for M1 CPUs looks worth
> mentioning.
>
>> + assert(hw_arch == 'arm64')
>>
>> - subtest:plan(4)
>> - -- FAT_MAGIC is an integer containing the value 0xCAFEBABE in
>> - -- big-endian byte order format. On a big-endian host CPU,
>> - -- this can be validated using the constant FAT_MAGIC;
>> - -- on a little-endian host CPU, it can be validated using
>> - -- the constant FAT_CIGAM.
>> - --
>> - -- FAT_NARCH is an integer specifying the number of fat_arch
>> - -- data structures that follow. This is the number of
>> - -- architectures contained in this binary.
>> - --
>> - -- See the aforementioned "OS X ABI Mach-O File Format
>> - -- Reference".
> The similar comment about Mach-O format will be appretiated.
mach-o header struct described in a comment above
>
>> - local FAT_MAGIC = '0xffffffffcafebabe'
>> - local FAT_NARCH = 2
>> + subtest:plan(5)
>>
>> local MODULE_NAME = 'lango_team'
>>
>> @@ -327,24 +110,19 @@ local function build_and_check_mach_o(subtest)
>> assert(os.remove(mach_o_obj_path), 'remove an object file')
>>
>> local magic_str = string.format('%#x', mach_o.header.magic)
>> - subtest:is(magic_str, FAT_MAGIC,
>> - 'fat_magic is correct in Mach-O')
>> - subtest:is(mach_o.header.nfat_arch, FAT_NARCH,
>> - 'nfat_arch is correct in Mach-O')
>> -
>> - local total_cputype = 0
>> - local total_cpusubtype = 0
>> - for i = 1, FAT_NARCH do
>> - total_cputype = total_cputype + mach_o.fat_arch[i].cputype
>> - total_cpusubtype = total_cpusubtype + mach_o.fat_arch[i].cpusubtype
>> - end
>> - subtest:is(total_cputype, SUM_CPUTYPE[hw_arch],
>> + subtest:is(magic_str, '0xfeedfacf',
> Please use MH_MAGIC_64 named constant for this magic string.
Added
>
>> + 'magic is correct in Mach-O')
> Looks like this line may be joined with the previous one.
not enough free space for this
>> + local cputype_str = string.format('%#x', mach_o.header.cputype)
>> + subtest:is(cputype_str, '0x100000c',
> Please use the named constant CPU_TYPE_ARM64 for this magic string.
Added
>
>> 'cputype is correct in Mach-O')
> Looks like this line may be joined with the previous one.
not enough free space for this
>
>> - subtest:is(total_cpusubtype, SUM_CPUSUBTYPE[hw_arch],
>> + subtest:is(mach_o.header.cpusubtype, 0,
> Please use the named constant CPU_SUBTYPE_ARM64 for this magic constant.
added
>
>> 'cpusubtype is correct in Mach-O')
> Looks like this line may be joined with the previous one.
not enough free space for this
>
>> + subtest:is(mach_o.header.filetype, 1,
> What does the 1 filetype mean?
> Please use the named constant.
MH_OBJECT, added * The file type MH_OBJECT is a compact format intended
as output of the * assembler and input (and possibly output) of the link
editor (the .o * format). All sections are in one unnamed segment with
no segment padding. * This format is used as an executable format when
the file is so small the * segment padding greatly increases it's size.
https://opensource.apple.com/source/xnu/xnu-344/EXTERNAL_HEADERS/mach-o/loader.h.auto.html
>
>> + 'filetype is correct in Mach-O')
> Looks like this line may be joined with the previous one.
no free space for this
>
>> + subtest:is(mach_o.header.ncmds, 2,
> Why there are 2 commands for Mach-O format?
> Please use the named constant.
is constant name 'ncmds' self-explained?
>
>> + 'ncmds is correct in Mach-O')
> Looks like this line may be joined with the previous one.
joined
>
>> end
>>
>> -test:test('arm', build_and_check_mach_o)
>> test:test('arm64', build_and_check_mach_o)
>>
>> test:done(true)
>> --
>> 2.34.1
>>
> [1]:https://github.com/LuaJIT/LuaJIT/issues/1181#issue-2202788411
>
[-- Attachment #2: Type: text/html, Size: 30014 bytes --]
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files.
2024-07-10 12:43 ` Sergey Bronnikov via Tarantool-patches
@ 2024-07-11 7:29 ` Sergey Kaplun via Tarantool-patches
2024-07-23 20:07 ` Sergey Bronnikov via Tarantool-patches
0 siblings, 1 reply; 12+ messages in thread
From: Sergey Kaplun via Tarantool-patches @ 2024-07-11 7:29 UTC (permalink / raw)
To: Sergey Bronnikov; +Cc: Sergey Bronnikov, tarantool-patches
Hi, Sergey!
Thanks for the fixes!
I've applied some minor fixes to your branch.
LGTM, after adding the comment about ncmds value.
On 10.07.24, Sergey Bronnikov wrote:
> Sergey,
>
> thanks for review. Fixes applied and force-pushed to the same branch.
>
>
> Sergey
>
> On 09.07.2024 16:03, Sergey Kaplun via Tarantool-patches wrote:
> > Hi, Sergey!
> > Thanks for the patch!
> > Please consider my comments below.
> >
> > May we add the test [1] to verify that there will be no regression in the
> > future?
>
> This "test" was for a FAT binary generated by LuaJIT.
>
> With backported patches, FAT (aka Universal Binary) support is gone.
>
> mach-O header is checked by tests in proposed patch.
OK, let's leave it as is.
>
> >
> > On 05.07.24, Sergey Bronnikov wrote:
> >> Reported by Sergey Bronnikov.
> >>
> >> (cherry picked from commit 7110b935672489afd6ba3eef3e5139d2f3bd05b6)
> >>
> >> Previously, LuaJIT generated Mach-O FAT object files for ARM and
> >> ARM64 on macOS. The patch removes support of 32-bit ARM and
> >> FAT object files and now LuaJIT generate Mach-O object files for
> >> ARM64.
> > I suppose we should mention that no x86/x86_64 objects are generated
> > now.
> x86_64 is still there:
>
> $ ./build/gc64/src/luajit -b -o osx -a arm64 empty.lua empty.o
> $ file empty.o
> empty.o: Mach-O 64-bit arm64 object
> $ ./build/gc64/src/luajit -b -o osx -a x64 empty.lua empty.o
> $ file empty.o
> empty.o: Mach-O 64-bit x86_64 object
> $
My bad, thanks for the clarification.
>
> Anyway, commit message has been updated.
>
> >> Sergey Bronnikov:
> >> * added the description and the trimmed the test for the problem
> >>
> >> Part of tarantool/tarantool#10199
> >> ---
> >> src/jit/bcsave.lua | 155 ++-------
> >> ...-865-cross-generation-mach-o-file.test.lua | 294 +++---------------
> >> 2 files changed, 70 insertions(+), 379 deletions(-)
> >>
> >> diff --git a/src/jit/bcsave.lua b/src/jit/bcsave.lua
> >> index 26ec29c6..61953c2d 100644
> >> --- a/src/jit/bcsave.lua
> >> +++ b/src/jit/bcsave.lua
<snipped>
> >
> >> + subtest:is(mach_o.header.ncmds, 2,
> > Why there are 2 commands for Mach-O format?
> > Please use the named constant.
> is constant name 'ncmds' self-explained?
No, since I don't understand why it is 2 and not 12. Please, add a
comment to make it obvious for any reader.
> >
> >> + 'ncmds is correct in Mach-O')
> > Looks like this line may be joined with the previous one.
> joined
> >
> >> end
<snipped>
I've added some fixes to your branch:
* Fixed the comment from --- to --.
* Fixed some typos.
* Moved constant declarations to the beginning of the file.
* Join some lines since there is no need to add a new line.
===================================================================
diff --git a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
index d30198c0..9963bf88 100644
--- a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
+++ b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
@@ -3,6 +3,12 @@ local test = tap.test('lj-865-cross-generation-mach-o-file')
local utils = require('utils')
local ffi = require('ffi')
+local CPU_TYPE_ARM64 = '0x100000c'
+local CPU_SUBTYPE_ARM64 = 0x0
+local MH_MAGIC_64 = '0xfeedfacf'
+-- Relocatable object file.
+local MH_OBJECT = 0x1
+
test:plan(1)
-- The test creates an object file in Mach-O format with LuaJIT
@@ -66,64 +72,64 @@ local function create_obj_file(name, arch)
return mach_o_path
end
--- Parses a buffer in the Mach-O format and returns its fields
--- in a table.
+-- Parses a buffer in the Mach-O format and returns its fields in
+-- a table.
-- The test creates an object file in Mach-O format with LuaJIT
-- bytecode and checks the validity of the object file fields.
----
---- The original problem is reproduced with LuaJIT, which is built
---- with enabled AVX512F instructions. The support for AVX512F
---- could be checked in `/proc/cpuinfo` on Linux and
---- `sysctl hw.optional.avx512f` on Mac. AVX512F must be
---- implicitly enabled in a C compiler by passing a CPU codename.
---- Please take a look at the GCC Online Documentation [1] for
---- available CPU codenames. Also, see the Wikipedia for CPUs with
---- AVX-512 support [2].
---- Execute command below to detect the CPU codename:
---- `gcc -march=native -Q --help=target | grep march`.
----
---- 1. https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
---- 2. https://en.wikipedia.org/wiki/AVX-512#CPUs_with_AVX-512
----
---- Manual steps for reproducing are the following:
----
---- $ CC=gcc TARGET_CFLAGS='skylake-avx512' cmake -S . -B build
---- $ cmake --build build --parallel
---- $ echo > test.lua
---- $ LUA_PATH="src/?.lua;;" luajit -b -o osx -a arm test.lua test.o
---- $ file test.o
---- empty.o: DOS executable (block device driver)
-
---- The format of the Mach-O is described in the document
---- "OS X ABI Mach-O File Format Reference", published by Apple
---- company. The copy of the (now removed) official documentation
---- can be found here [1]. There is a good visual representation
---- of Mach-O format in "Mac OS X Internals" book (pages 67-68)
---- [2] and in the [3].
--
---- 0x0000000 ---------------------------------------
---- | 0xfeedface MH_MAGIC magic
---- | ------------------------------------
---- | 0x00000012 CPU_TYPE_POWERPC cputype
---- | ------------------------------------
---- struct | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
---- mach_header | ------------------------------------
---- | 0x00000002 MH_EXECUTE filetype
---- | ------------------------------------
---- | 0x0000000b 10 load commands ncmds
---- | ------------------------------------
---- | 0x00000574 1396 bytes sizeofcmds
---- | ------------------------------------
---- | 0x00000085 DYLDLINK TWOLEVEL flags
---- --------------------------------------
---- Load commands
---- ---------------------------------------
---- Data
---- ---------------------------------------
----
---- 1. https://github.com/aidansteele/osx-abi-macho-file-format-reference
---- 2. https://reverseengineering.stackexchange.com/a/6357/46029
---- 3. http://formats.kaitai.io/mach_o/index.html
+-- The original problem is reproduced with LuaJIT, which is built
+-- with enabled AVX512F instructions. The support for AVX512F
+-- could be checked in `/proc/cpuinfo` on Linux and
+-- `sysctl hw.optional.avx512f` on Mac. AVX512F must be implicitly
+-- enabled in a C compiler by passing a CPU codename.
+-- Please take a look at the GCC Online Documentation [1] for
+-- available CPU codenames. Also, see the Wikipedia for CPUs with
+-- AVX-512 support [2].
+-- Execute the command below to detect the CPU codename:
+-- `gcc -march=native -Q --help=target | grep march`.
+--
+-- 1. https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
+-- 2. https://en.wikipedia.org/wiki/AVX-512#CPUs_with_AVX-512
+--
+-- Manual steps for reproducing are the following:
+--
+-- $ CC=gcc TARGET_CFLAGS='skylake-avx512' cmake -S . -B build
+-- $ cmake --build build --parallel
+-- $ echo > test.lua
+-- $ ./luajit -b -o osx -a arm64 test.lua test.o
+-- $ file test.o
+-- test.o: Mach-O 64-bit arm64 object
+
+-- The format of the Mach-O is described in the document
+-- "OS X ABI Mach-O File Format Reference", published by Apple
+-- company. The copy of the (now removed) official documentation
+-- can be found here [1]. There is a good visual representation
+-- of Mach-O format in "Mac OS X Internals" book (pages 67-68)
+-- [2] and in the [3].
+--
+-- 0x0000000 ---------------------------------------
+-- | 0xfeedface MH_MAGIC magic
+-- | ------------------------------------
+-- | 0x00000012 CPU_TYPE_POWERPC cputype
+-- | ------------------------------------
+-- struct | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
+-- mach_header | ------------------------------------
+-- | 0x00000002 MH_EXECUTE filetype
+-- | ------------------------------------
+-- | 0x0000000b 10 load commands ncmds
+-- | ------------------------------------
+-- | 0x00000574 1396 bytes sizeofcmds
+-- | ------------------------------------
+-- | 0x00000085 DYLDLINK TWOLEVEL flags
+-- --------------------------------------
+-- Load commands
+-- ---------------------------------------
+-- Data
+-- ---------------------------------------
+--
+-- 1. https://github.com/aidansteele/osx-abi-macho-file-format-reference
+-- 2. https://reverseengineering.stackexchange.com/a/6357/46029
+-- 3. http://formats.kaitai.io/mach_o/index.html
local function read_mach_o_hdr(buf, hw_arch)
-- LuaJIT always generate 64-bit non-FAT Mach-O object files.
assert(hw_arch == 'arm64')
@@ -138,11 +144,11 @@ local function read_mach_o_hdr(buf, hw_arch)
return mach_header
end
--- The function builds Mach-O object file and retrieves
--- its header fields.
+-- The function builds a Mach-O object file and retrieves its
+-- header fields.
local function build_and_check_mach_o(subtest)
local hw_arch = subtest.name
- -- LuaJIT always generate 64-bit non-FAT Mach-O object files.
+ -- LuaJIT always generates 64-bit, non-FAT Mach-O object files.
assert(hw_arch == 'arm64')
subtest:plan(5)
@@ -159,19 +165,12 @@ local function build_and_check_mach_o(subtest)
assert(os.remove(mach_o_obj_path), 'remove an object file')
local magic_str = string.format('%#x', mach_o.magic)
- local MH_MAGIC_64 = '0xfeedfacf'
- subtest:is(magic_str, MH_MAGIC_64,
- 'magic is correct in Mach-O')
+ subtest:is(magic_str, MH_MAGIC_64, 'magic is correct in Mach-O')
local cputype_str = string.format('%#x', mach_o.cputype)
- local CPU_TYPE_ARM64 = '0x100000c'
- subtest:is(cputype_str, CPU_TYPE_ARM64,
- 'cputype is correct in Mach-O')
- local CPU_SUBTYPE_ARM64 = 0
+ subtest:is(cputype_str, CPU_TYPE_ARM64, 'cputype is correct in Mach-O')
subtest:is(mach_o.cpusubtype, CPU_SUBTYPE_ARM64,
'cpusubtype is correct in Mach-O')
- local MH_OBJECT = 1
- subtest:is(mach_o.filetype, MH_OBJECT,
- 'filetype is correct in Mach-O')
+ subtest:is(mach_o.filetype, MH_OBJECT, 'filetype is correct in Mach-O')
subtest:is(mach_o.ncmds, 2, 'ncmds is correct in Mach-O')
end
===================================================================
Please let me know if you have any concerns.
--
Best regards,
Sergey Kaplun
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [Tarantool-patches] [PATCH luajit 1/2] Fix typo.
2024-07-05 13:10 ` [Tarantool-patches] [PATCH luajit 1/2] Fix typo Sergey Bronnikov via Tarantool-patches
2024-07-09 12:15 ` Sergey Kaplun via Tarantool-patches
@ 2024-07-11 9:15 ` Maxim Kokryashkin via Tarantool-patches
1 sibling, 0 replies; 12+ messages in thread
From: Maxim Kokryashkin via Tarantool-patches @ 2024-07-11 9:15 UTC (permalink / raw)
To: Sergey Bronnikov; +Cc: tarantool-patches
Hi, Sergey!
Thanks for the patch!
LGTM
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files.
2024-07-11 7:29 ` Sergey Kaplun via Tarantool-patches
@ 2024-07-23 20:07 ` Sergey Bronnikov via Tarantool-patches
2024-08-19 9:45 ` Maxim Kokryashkin via Tarantool-patches
0 siblings, 1 reply; 12+ messages in thread
From: Sergey Bronnikov via Tarantool-patches @ 2024-07-23 20:07 UTC (permalink / raw)
To: Sergey Kaplun; +Cc: Sergey Bronnikov, tarantool-patches
[-- Attachment #1: Type: text/plain, Size: 12715 bytes --]
Hi, Sergey
thanks for the comments and fixes!
But please don't squash fixes next time.
Sergey
On 11.07.2024 10:29, Sergey Kaplun wrote:
> Hi, Sergey!
> Thanks for the fixes!
> I've applied some minor fixes to your branch.
> LGTM, after adding the comment about ncmds value.
>
> On 10.07.24, Sergey Bronnikov wrote:
>> Sergey,
>>
>> thanks for review. Fixes applied and force-pushed to the same branch.
>>
>>
>> Sergey
>>
>> On 09.07.2024 16:03, Sergey Kaplun via Tarantool-patches wrote:
>>> Hi, Sergey!
>>> Thanks for the patch!
>>> Please consider my comments below.
>>>
>>> May we add the test [1] to verify that there will be no regression in the
>>> future?
>> This "test" was for a FAT binary generated by LuaJIT.
>>
>> With backported patches, FAT (aka Universal Binary) support is gone.
>>
>> mach-O header is checked by tests in proposed patch.
> OK, let's leave it as is.
Thanks!
>
>>> On 05.07.24, Sergey Bronnikov wrote:
>>>> Reported by Sergey Bronnikov.
>>>>
>>>> (cherry picked from commit 7110b935672489afd6ba3eef3e5139d2f3bd05b6)
>>>>
>>>> Previously, LuaJIT generated Mach-O FAT object files for ARM and
>>>> ARM64 on macOS. The patch removes support of 32-bit ARM and
>>>> FAT object files and now LuaJIT generate Mach-O object files for
>>>> ARM64.
>>> I suppose we should mention that no x86/x86_64 objects are generated
>>> now.
>> x86_64 is still there:
>>
>> $ ./build/gc64/src/luajit -b -o osx -a arm64 empty.lua empty.o
>> $ file empty.o
>> empty.o: Mach-O 64-bit arm64 object
>> $ ./build/gc64/src/luajit -b -o osx -a x64 empty.lua empty.o
>> $ file empty.o
>> empty.o: Mach-O 64-bit x86_64 object
>> $
> My bad, thanks for the clarification.
>
>> Anyway, commit message has been updated.
>>
>>>> Sergey Bronnikov:
>>>> * added the description and the trimmed the test for the problem
>>>>
>>>> Part of tarantool/tarantool#10199
>>>> ---
>>>> src/jit/bcsave.lua | 155 ++-------
>>>> ...-865-cross-generation-mach-o-file.test.lua | 294 +++---------------
>>>> 2 files changed, 70 insertions(+), 379 deletions(-)
>>>>
>>>> diff --git a/src/jit/bcsave.lua b/src/jit/bcsave.lua
>>>> index 26ec29c6..61953c2d 100644
>>>> --- a/src/jit/bcsave.lua
>>>> +++ b/src/jit/bcsave.lua
> <snipped>
>
>>>> + subtest:is(mach_o.header.ncmds, 2,
>>> Why there are 2 commands for Mach-O format?
>>> Please use the named constant.
>> is constant name 'ncmds' self-explained?
> No, since I don't understand why it is 2 and not 12. Please, add a
> comment to make it obvious for any reader.
Why it should be 12?
I just used a constant from bcsave.lua [1].
I don't get an initial idea behind this number. As I got it right from
Mach-O spec `ncmd` is a number of load commands following the header.
The possible load commands listed in a table [2], but no one load command
listed in a table is used in bcsave.lua for generation Mach-O object file.
1.
https://github.com/LuaJIT/LuaJIT/blob/04dca7911ea255f37be799c18d74c305b921c1a6/src/jit/bcsave.lua#L489
2.
https://github.com/aidansteele/osx-abi-macho-file-format-reference?tab=readme-ov-file#table-4-mach-o-load-commands
>>>> + 'ncmds is correct in Mach-O')
>>> Looks like this line may be joined with the previous one.
>> joined
>>>> end
> <snipped>
>
> I've added some fixes to your branch:
> * Fixed the comment from --- to --.
> * Fixed some typos.
> * Moved constant declarations to the beginning of the file.
> * Join some lines since there is no need to add a new line.
Added two more fixes:
* moved test description to the top of the test. It would be better to
place problem description
at the beginning and Mach-O format description before constants.
* sorted constants alphabetically
* and added a comment:
--- a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
+++ b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
@@ -64,6 +64,7 @@ test:plan(1)
local CPU_SUBTYPE_ARM64 = 0x0
local CPU_TYPE_ARM64 = '0x100000c'
+-- MH_MAGIC_64: mach-o, big-endian, x64.
local MH_MAGIC_64 = '0xfeedfacf'
-- Relocatable object file.
local MH_OBJECT = 0x1
>
> ===================================================================
> diff --git a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
> index d30198c0..9963bf88 100644
> --- a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
> +++ b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
> @@ -3,6 +3,12 @@ local test = tap.test('lj-865-cross-generation-mach-o-file')
> local utils = require('utils')
> local ffi = require('ffi')
>
> +local CPU_TYPE_ARM64 = '0x100000c'
> +local CPU_SUBTYPE_ARM64 = 0x0
> +local MH_MAGIC_64 = '0xfeedfacf'
> +-- Relocatable object file.
> +local MH_OBJECT = 0x1
> +
> test:plan(1)
>
> -- The test creates an object file in Mach-O format with LuaJIT
> @@ -66,64 +72,64 @@ local function create_obj_file(name, arch)
> return mach_o_path
> end
>
> --- Parses a buffer in the Mach-O format and returns its fields
> --- in a table.
> +-- Parses a buffer in the Mach-O format and returns its fields in
> +-- a table.
> -- The test creates an object file in Mach-O format with LuaJIT
> -- bytecode and checks the validity of the object file fields.
> ----
> ---- The original problem is reproduced with LuaJIT, which is built
> ---- with enabled AVX512F instructions. The support for AVX512F
> ---- could be checked in `/proc/cpuinfo` on Linux and
> ---- `sysctl hw.optional.avx512f` on Mac. AVX512F must be
> ---- implicitly enabled in a C compiler by passing a CPU codename.
> ---- Please take a look at the GCC Online Documentation [1] for
> ---- available CPU codenames. Also, see the Wikipedia for CPUs with
> ---- AVX-512 support [2].
> ---- Execute command below to detect the CPU codename:
> ---- `gcc -march=native -Q --help=target | grep march`.
> ----
> ---- 1.https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
> ---- 2.https://en.wikipedia.org/wiki/AVX-512#CPUs_with_AVX-512
> ----
> ---- Manual steps for reproducing are the following:
> ----
> ---- $ CC=gcc TARGET_CFLAGS='skylake-avx512' cmake -S . -B build
> ---- $ cmake --build build --parallel
> ---- $ echo > test.lua
> ---- $ LUA_PATH="src/?.lua;;" luajit -b -o osx -a arm test.lua test.o
> ---- $ file test.o
> ---- empty.o: DOS executable (block device driver)
> -
> ---- The format of the Mach-O is described in the document
> ---- "OS X ABI Mach-O File Format Reference", published by Apple
> ---- company. The copy of the (now removed) official documentation
> ---- can be found here [1]. There is a good visual representation
> ---- of Mach-O format in "Mac OS X Internals" book (pages 67-68)
> ---- [2] and in the [3].
> --
> ---- 0x0000000 ---------------------------------------
> ---- | 0xfeedface MH_MAGIC magic
> ---- | ------------------------------------
> ---- | 0x00000012 CPU_TYPE_POWERPC cputype
> ---- | ------------------------------------
> ---- struct | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
> ---- mach_header | ------------------------------------
> ---- | 0x00000002 MH_EXECUTE filetype
> ---- | ------------------------------------
> ---- | 0x0000000b 10 load commands ncmds
> ---- | ------------------------------------
> ---- | 0x00000574 1396 bytes sizeofcmds
> ---- | ------------------------------------
> ---- | 0x00000085 DYLDLINK TWOLEVEL flags
> ---- --------------------------------------
> ---- Load commands
> ---- ---------------------------------------
> ---- Data
> ---- ---------------------------------------
> ----
> ---- 1.https://github.com/aidansteele/osx-abi-macho-file-format-reference
> ---- 2.https://reverseengineering.stackexchange.com/a/6357/46029
> ---- 3.http://formats.kaitai.io/mach_o/index.html
> +-- The original problem is reproduced with LuaJIT, which is built
> +-- with enabled AVX512F instructions. The support for AVX512F
> +-- could be checked in `/proc/cpuinfo` on Linux and
> +-- `sysctl hw.optional.avx512f` on Mac. AVX512F must be implicitly
> +-- enabled in a C compiler by passing a CPU codename.
> +-- Please take a look at the GCC Online Documentation [1] for
> +-- available CPU codenames. Also, see the Wikipedia for CPUs with
> +-- AVX-512 support [2].
> +-- Execute the command below to detect the CPU codename:
> +-- `gcc -march=native -Q --help=target | grep march`.
> +--
> +-- 1.https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
> +-- 2.https://en.wikipedia.org/wiki/AVX-512#CPUs_with_AVX-512
> +--
> +-- Manual steps for reproducing are the following:
> +--
> +-- $ CC=gcc TARGET_CFLAGS='skylake-avx512' cmake -S . -B build
> +-- $ cmake --build build --parallel
> +-- $ echo > test.lua
> +-- $ ./luajit -b -o osx -a arm64 test.lua test.o
> +-- $ file test.o
> +-- test.o: Mach-O 64-bit arm64 object
> +
> +-- The format of the Mach-O is described in the document
> +-- "OS X ABI Mach-O File Format Reference", published by Apple
> +-- company. The copy of the (now removed) official documentation
> +-- can be found here [1]. There is a good visual representation
> +-- of Mach-O format in "Mac OS X Internals" book (pages 67-68)
> +-- [2] and in the [3].
> +--
> +-- 0x0000000 ---------------------------------------
> +-- | 0xfeedface MH_MAGIC magic
> +-- | ------------------------------------
> +-- | 0x00000012 CPU_TYPE_POWERPC cputype
> +-- | ------------------------------------
> +-- struct | 0x00000000 CPU_SUBTYPE_POWERPC_ALL cpusubtype
> +-- mach_header | ------------------------------------
> +-- | 0x00000002 MH_EXECUTE filetype
> +-- | ------------------------------------
> +-- | 0x0000000b 10 load commands ncmds
> +-- | ------------------------------------
> +-- | 0x00000574 1396 bytes sizeofcmds
> +-- | ------------------------------------
> +-- | 0x00000085 DYLDLINK TWOLEVEL flags
> +-- --------------------------------------
> +-- Load commands
> +-- ---------------------------------------
> +-- Data
> +-- ---------------------------------------
> +--
> +-- 1.https://github.com/aidansteele/osx-abi-macho-file-format-reference
> +-- 2.https://reverseengineering.stackexchange.com/a/6357/46029
> +-- 3.http://formats.kaitai.io/mach_o/index.html
> local function read_mach_o_hdr(buf, hw_arch)
> -- LuaJIT always generate 64-bit non-FAT Mach-O object files.
> assert(hw_arch == 'arm64')
> @@ -138,11 +144,11 @@ local function read_mach_o_hdr(buf, hw_arch)
> return mach_header
> end
>
> --- The function builds Mach-O object file and retrieves
> --- its header fields.
> +-- The function builds a Mach-O object file and retrieves its
> +-- header fields.
> local function build_and_check_mach_o(subtest)
> local hw_arch = subtest.name
> - -- LuaJIT always generate 64-bit non-FAT Mach-O object files.
> + -- LuaJIT always generates 64-bit, non-FAT Mach-O object files.
> assert(hw_arch == 'arm64')
>
> subtest:plan(5)
> @@ -159,19 +165,12 @@ local function build_and_check_mach_o(subtest)
> assert(os.remove(mach_o_obj_path), 'remove an object file')
>
> local magic_str = string.format('%#x', mach_o.magic)
> - local MH_MAGIC_64 = '0xfeedfacf'
> - subtest:is(magic_str, MH_MAGIC_64,
> - 'magic is correct in Mach-O')
> + subtest:is(magic_str, MH_MAGIC_64, 'magic is correct in Mach-O')
> local cputype_str = string.format('%#x', mach_o.cputype)
> - local CPU_TYPE_ARM64 = '0x100000c'
> - subtest:is(cputype_str, CPU_TYPE_ARM64,
> - 'cputype is correct in Mach-O')
> - local CPU_SUBTYPE_ARM64 = 0
> + subtest:is(cputype_str, CPU_TYPE_ARM64, 'cputype is correct in Mach-O')
> subtest:is(mach_o.cpusubtype, CPU_SUBTYPE_ARM64,
> 'cpusubtype is correct in Mach-O')
> - local MH_OBJECT = 1
> - subtest:is(mach_o.filetype, MH_OBJECT,
> - 'filetype is correct in Mach-O')
> + subtest:is(mach_o.filetype, MH_OBJECT, 'filetype is correct in Mach-O')
> subtest:is(mach_o.ncmds, 2, 'ncmds is correct in Mach-O')
> end
>
> ===================================================================
>
> Please let me know if you have any concerns.
>
[-- Attachment #2: Type: text/html, Size: 16716 bytes --]
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files.
2024-07-23 20:07 ` Sergey Bronnikov via Tarantool-patches
@ 2024-08-19 9:45 ` Maxim Kokryashkin via Tarantool-patches
2024-08-20 8:57 ` Sergey Bronnikov via Tarantool-patches
0 siblings, 1 reply; 12+ messages in thread
From: Maxim Kokryashkin via Tarantool-patches @ 2024-08-19 9:45 UTC (permalink / raw)
To: Sergey Bronnikov; +Cc: tarantool-patches, Sergey Bronnikov
Hi, Sergey!
Thanks for the patch!
As this thread replies grew way beyond comprehensible limit, I'll refer
to the GitHub commit instead.
> Sergey Bronnikov:
> * added the description and the trimmed the test for the problem
Typo: s/the trimmed/trimmed/
<lj-865-cross-generation-mach-o-file.test.lua>
Lines: 149-150:
> -- The function builds a Mach-O object file and retrieves its
> -- header fields.
I believe, "validates" fits better than "retrieves" here.
Line: 153:
> -- LuaJIT always generate 64-bit, non-FAT Mach-O object files.
Typo: s/generate/generates/
Otherwise, LGTM.
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files.
2024-08-19 9:45 ` Maxim Kokryashkin via Tarantool-patches
@ 2024-08-20 8:57 ` Sergey Bronnikov via Tarantool-patches
0 siblings, 0 replies; 12+ messages in thread
From: Sergey Bronnikov via Tarantool-patches @ 2024-08-20 8:57 UTC (permalink / raw)
To: Maxim Kokryashkin; +Cc: tarantool-patches, Sergey Bronnikov
[-- Attachment #1: Type: text/plain, Size: 1384 bytes --]
Hi, Max
thanks for review!
On 19.08.2024 12:45, Maxim Kokryashkin wrote:
> Hi, Sergey!
> Thanks for the patch!
>
> As this thread replies grew way beyond comprehensible limit, I'll refer
> to the GitHub commit instead.
>
>> Sergey Bronnikov:
>> * added the description and the trimmed the test for the problem
> Typo: s/the trimmed/trimmed/
>
> <lj-865-cross-generation-mach-o-file.test.lua>
>
> Lines: 149-150:
>> -- The function builds a Mach-O object file and retrieves its
>> -- header fields.
> I believe, "validates" fits better than "retrieves" here.
>
> Line: 153:
>> -- LuaJIT always generate 64-bit, non-FAT Mach-O object files.
> Typo: s/generate/generates/
Both typos were fixed:
--- a/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
+++ b/test/tarantool-tests/lj-865-cross-generation-mach-o-file.test.lua
@@ -146,11 +146,11 @@ local function read_mach_o_hdr(buf, hw_arch)
return mach_header
end
--- The function builds a Mach-O object file and retrieves its
+-- The function builds a Mach-O object file and validates its
-- header fields.
local function build_and_check_mach_o(subtest)
local hw_arch = subtest.name
- -- LuaJIT always generate 64-bit, non-FAT Mach-O object files.
+ -- LuaJIT always generates 64-bit, non-FAT Mach-O object files.
assert(hw_arch == 'arm64')
subtest:plan(5)
>
> Otherwise, LGTM.
[-- Attachment #2: Type: text/html, Size: 2612 bytes --]
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [Tarantool-patches] [PATCH luajit 0/2] Fixes in Mach-O generation code
2024-07-05 13:10 [Tarantool-patches] [PATCH luajit 0/2] Fixes in Mach-O generation code Sergey Bronnikov via Tarantool-patches
2024-07-05 13:10 ` [Tarantool-patches] [PATCH luajit 1/2] Fix typo Sergey Bronnikov via Tarantool-patches
2024-07-05 13:10 ` [Tarantool-patches] [PATCH luajit 2/2] OSX/iOS: Always generate 64 bit non-FAT Mach-O object files Sergey Bronnikov via Tarantool-patches
@ 2024-10-18 15:06 ` Sergey Kaplun via Tarantool-patches
2 siblings, 0 replies; 12+ messages in thread
From: Sergey Kaplun via Tarantool-patches @ 2024-10-18 15:06 UTC (permalink / raw)
To: Sergey Bronnikov; +Cc: tarantool-patches
Sergey,
I've checked the patchset into all long-term branches in
tarantool/luajit and bumped a new version in master [1], release/3.2 [2]
and release/2.11 [3].
[1]: https://github.com/tarantool/tarantool/pull/10712
[2]: https://github.com/tarantool/tarantool/pull/10713
[3]: https://github.com/tarantool/tarantool/pull/10714
--
Best regards,
Sergey Kaplun
^ permalink raw reply [flat|nested] 12+ messages in thread
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2024-07-09 12:15 ` Sergey Kaplun via Tarantool-patches
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2024-08-20 8:57 ` Sergey Bronnikov via Tarantool-patches
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