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[llvm-objcopy][MachO] Fix segment size alignment

Browse Source 
This diff addresses the old TODO in MachOObjcopy.cpp and
correctly sets the page size used for alignment of segments.
In particular, now llvm-objcopy's output is consistent
with the input (the alignment of vmsize doesn't change).

Test plan:

1. make check-all
2. verify that a binary copied via llvm-objcopy now correctly works on iOS.

Differential revision: https://reviews.llvm.org/D82503
This commit is contained in:
Alexander Shaposhnikov 2020-06-29 23:09:38 -07:00
parent 4bd32c5a01
commit 1130a0fbe6
2 changed files with 909 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

897
test/tools/llvm-objcopy/MachO/segment-size-alignment.test Normal file
View File

@ -0,0 +1,897 @@
# RUN: yaml2obj --docnum=1 %s -o %t.armv7
# RUN: llvm-objdump --private-headers %t.armv7 | FileCheck %s --check-prefix=ARMV7
# ARMV7: segname __PAGEZERO
# ARMV7-NEXT: vmaddr 0x00000000
# ARMV7-NEXT: vmsize 0x00004000
# ARMV7: segname __TEXT
# ARMV7-NEXT: vmaddr 0x00004000
# ARMV7-NEXT: vmsize 0x00008000
# ARMV7: segname __LINKEDIT
# ARMV7-NEXT: vmaddr 0x0000c000
# ARMV7-NEXT: vmsize 0x00004000
# RUN: yaml2obj --docnum=2 %s -o %t.arm64
# RUN: llvm-objdump --private-headers %t.arm64 | FileCheck %s --check-prefix=ARM64
# ARM64: segname __PAGEZERO
# ARM64-NEXT: vmaddr 0x0000000000000000
# ARM64-NEXT: vmsize 0x0000000100000000
# ARM64: segname __TEXT
# ARM64-NEXT: vmaddr 0x0000000100000000
# ARM64-NEXT: vmsize 0x0000000000008000
# ARM64: segname __LINKEDIT
# ARM64-NEXT: vmaddr 0x0000000100008000
# ARM64-NEXT: vmsize 0x0000000000004000
# RUN: yaml2obj --docnum=3 %s -o %t.arm64_32
# RUN: llvm-objdump --private-headers %t.arm64_32 | FileCheck %s --check-prefix=ARM64_32
# ARM64_32: segname __PAGEZERO
# ARM64_32-NEXT: vmaddr 0x00000000
# ARM64_32-NEXT: vmsize 0x00004000
# ARM64_32: segname __TEXT
# ARM64_32-NEXT: vmaddr 0x00004000
# ARM64_32-NEXT: vmsize 0x00008000
# ARM64_32: segname __LINKEDIT
# ARM64_32-NEXT: vmaddr 0x0000c000
# ARM64_32-NEXT: vmsize 0x00004000
# RUN: yaml2obj --docnum=4 %s -o %t.x86_64
# RUN: llvm-objdump --private-headers %t.x86_64 | FileCheck %s --check-prefix=X86_64
# X86_64: segname __PAGEZERO
# X86_64-NEXT: vmaddr 0x0000000000000000
# X86_64-NEXT: vmsize 0x0000000100000000
# X86_64: segname __TEXT
# X86_64-NEXT: vmaddr 0x0000000100000000
# X86_64-NEXT: vmsize 0x0000000000001000
# X86_64: segname __LINKEDIT
# X86_64-NEXT: vmaddr 0x0000000100001000
# X86_64-NEXT: vmsize 0x0000000000001000
## Input binaries:
## Case 1: armv7 iOS binary.
## This binary can be built on OSX as follows:
## main.c: int main() { return 0; }
## xcrun -sdk iphoneos clang -arch armv7 main.c -o main.exe
--- !mach-o
FileHeader:
magic: 0xFEEDFACE
cputype: 0x0000000C
cpusubtype: 0x00000009
filetype: 0x00000002
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sizeofcmds: 600
flags: 0x00200085
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cmdsize: 56
segname: __PAGEZERO
vmaddr: 0
vmsize: 16384
fileoff: 0
filesize: 0
maxprot: 0
initprot: 0
nsects: 0
flags: 0
- cmd: LC_SEGMENT
cmdsize: 124
segname: __TEXT
vmaddr: 16384
vmsize: 32768
fileoff: 0
filesize: 32768
maxprot: 5
initprot: 5
nsects: 1
flags: 0
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segname: __TEXT
addr: 0x000000000000BFF6
size: 10
offset: 0x00007FF6
align: 1
reloff: 0x00000000
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flags: 0x80000400
reserved1: 0x00000000
reserved2: 0x00000000
reserved3: 0x00000000
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vmsize: 16384
fileoff: 32768
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name: 12
PayloadString: '/usr/lib/dyld'
ZeroPadBytes: 3
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uuid: C84A0193-BE6F-3625-882F-CBFC052AF6CF
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version: 0
- cmd: LC_MAIN
cmdsize: 24
entryoff: 32759
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timestamp: 2
current_version: 83951616
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## main.c: int main() { return 0; }
## xcrun -sdk iphoneos clang -arch arm64 main.c -o main.exe
--- !mach-o
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## main.c: int main() { return 0; }
## xcrun -sdk watchos clang -arch arm64_32 main.c -o main.exe
--- !mach-o
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15
tools/llvm-objcopy/MachO/MachOObjcopy.cpp
View File

@ -338,9 +338,18 @@ Error executeObjcopyOnBinary(const CopyConfig &Config,
if (Error E = handleArgs(Config, *O))
return createFileError(Config.InputFilename, std::move(E));
// TODO: Support 16KB pages which are employed in iOS arm64 binaries:
// https://github.com/llvm/llvm-project/commit/1bebb2832ee312d3b0316dacff457a7a29435edb
const uint64_t PageSize = 4096;
// Page size used for alignment of segment sizes in Mach-O executables and
// dynamic libraries.
uint64_t PageSize;
switch (In.getArch()) {
case Triple::ArchType::arm:
case Triple::ArchType::aarch64:
case Triple::ArchType::aarch64_32:
PageSize = 16384;
break;
default:
PageSize = 4096;
}
MachOWriter Writer(*O, In.is64Bit(), In.isLittleEndian(), PageSize, Out);
if (auto E = Writer.finalize())