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llvm-project/llvm/test/tools/llvm-objdump/ELF/program-headers.test
Fangrui Song 11a8fc6856 [llvm-objdump] --private-headers: change errors to warnings for dynamic section dumping 
Fix #54456: `objcopy --only-keep-debug` produces a linked image with invalid
empty dynamic section. llvm-objdump -p currently reports an error which seems
excessive.

```
% llvm-readelf -l a.out
llvm-readelf: warning: 'a.out': no valid dynamic table was found
...
```

Follow the spirit of llvm-readelf -l (D64472) and report a warning instead.
This allows later files to be dumped despite warnings for an input file, and
improves objdump compatibility in that the exit code is now 0 instead of 1.

```
% llvm-objdump -p a.out  # new behavior
...
Program Header:
llvm-objdump: warning: 'a.out': invalid empty dynamic section
% objdump -p a.out
...
Dynamic Section:

```

Reviewed By: jhenderson, raj.khem

Differential Revision: https://reviews.llvm.org/D122505
2022-03-28 01:00:43 -07:00

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## Check that program headers are output correctly
# RUN: yaml2obj --docnum=1 -DBITS=32 -DMACHINE=EM_386 %s -o %t32.elf
# RUN: llvm-objdump --private-headers %t32.elf | FileCheck %s --check-prefixes=ELF32
# ELF32: Program Header:
# ELF32-NEXT: PHDR off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags -w-
# ELF32-NEXT: PHDR off 0x00000317 vaddr 0x00002000 paddr 0x00002000 align 2**0
# ELF32-NEXT: filesz 0x00000007 memsz 0x00000007 flags --x
# ELF32-NEXT: UNKNOWN off 0x00000317 vaddr 0x00002000 paddr 0x00002000 align 2**0
# ELF32-NEXT: filesz 0x00000007 memsz 0x00000007 flags --x
# ELF32-NEXT: DYNAMIC off 0x00000324 vaddr 0x00006000 paddr 0x00006000 align 2**0
# ELF32-NEXT: filesz 0x00000010 memsz 0x00000010 flags rwx
# ELF32-NEXT: INTERP off 0x0000031e vaddr 0x00003000 paddr 0x00003000 align 2**0
# ELF32-NEXT: filesz 0x00000004 memsz 0x00000004 flags rw-
# ELF32-NEXT: NOTE off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: UNKNOWN off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000001 memsz 0x00000001 flags ---
# ELF32-NEXT: TLS off 0x00000322 vaddr 0x00004000 paddr 0x00004000 align 2**0
# ELF32-NEXT: filesz 0x00000001 memsz 0x00000001 flags ---
# ELF32-NEXT: UNKNOWN off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT:EH_FRAME off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: UNKNOWN off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: STACK off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: RELRO off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT:PROPERTY off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: OPENBSD_RANDOMIZE off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: OPENBSD_WXNEEDED off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: OPENBSD_BOOTDATA off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: UNKNOWN off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: UNKNOWN off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: UNKNOWN off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: UNKNOWN off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: UNKNOWN off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-NEXT: UNKNOWN off 0x00000314 vaddr 0x00001000 paddr 0x00001000 align 2**0
# ELF32-NEXT: filesz 0x00000003 memsz 0x00000003 flags ---
# ELF32-EMPTY:
# RUN: yaml2obj --docnum=1 -DBITS=64 -DMACHINE=EM_X86_64 %s -o %t64.elf
# RUN: llvm-objdump --private-headers %t64.elf | FileCheck %s --check-prefixes=ELF64
# ELF64: Program Header:
# ELF64-NEXT: PHDR off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags -w-
# ELF64-NEXT: PHDR off 0x000000000000054b vaddr 0x0000000000002000 paddr 0x0000000000002000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000007 memsz 0x0000000000000007 flags --x
# ELF64-NEXT: UNKNOWN off 0x000000000000054b vaddr 0x0000000000002000 paddr 0x0000000000002000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000007 memsz 0x0000000000000007 flags --x
# ELF64-NEXT: DYNAMIC off 0x0000000000000558 vaddr 0x0000000000006000 paddr 0x0000000000006000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000020 memsz 0x0000000000000020 flags rwx
# ELF64-NEXT: INTERP off 0x0000000000000552 vaddr 0x0000000000003000 paddr 0x0000000000003000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000004 memsz 0x0000000000000004 flags rw-
# ELF64-NEXT: NOTE off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: UNKNOWN off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000001 memsz 0x0000000000000001 flags ---
# ELF64-NEXT: TLS off 0x0000000000000556 vaddr 0x0000000000004000 paddr 0x0000000000004000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000001 memsz 0x0000000000000001 flags ---
# ELF64-NEXT: UNKNOWN off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT:EH_FRAME off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: UNKNOWN off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: STACK off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: RELRO off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: PROPERTY off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: OPENBSD_RANDOMIZE off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: OPENBSD_WXNEEDED off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: OPENBSD_BOOTDATA off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: UNKNOWN off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: UNKNOWN off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: UNKNOWN off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: UNKNOWN off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: UNKNOWN off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-NEXT: UNKNOWN off 0x0000000000000548 vaddr 0x0000000000001000 paddr 0x0000000000001000 align 2**0
# ELF64-NEXT: filesz 0x0000000000000003 memsz 0x0000000000000003 flags ---
# ELF64-EMPTY:
--- !ELF
FileHeader:
Class: ELFCLASS[[BITS]]
Data: ELFDATA2LSB
Type: ET_EXEC
Machine: [[MACHINE]]
Sections:
- Name: .foo.begin
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
Address: 0x1000
Size: 0x1
- Name: .foo.end
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
Size: 0x2
- Name: .bar.begin
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
Address: 0x2000
Size: 0x3
- Name: .bar.end
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
Size: 0x4
- Name: .interp
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
Address: 0x3000
Content: "41424300" ## "ABC"
- Name: .tls
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_TLS ]
Address: 0x4000
Size: 0x1
- Name: .unused
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_TLS ]
Address: 0x5000
Size: 0x1
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Address: 0x6000
Entries:
- Tag: DT_NEEDED
Value: 0x1
- Tag: DT_NULL
Value: 0x0
ProgramHeaders:
## Case 1: an arbitrary segment with sections.
- Type: PT_PHDR
Flags: [ PF_W ]
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 2: another segment with different sections.
- Type: PT_PHDR
Flags: [ PF_X ]
VAddr: 0x2000
FirstSec: .bar.begin
LastSec: .bar.end
## Case 3: the PT_NULL segment.
- Type: PT_NULL
Flags: [ PF_X ]
VAddr: 0x2000
FirstSec: .bar.begin
LastSec: .bar.end
## Case 4: the PT_DYNAMIC segment.
- Type: PT_DYNAMIC
Flags: [ PF_R, PF_W, PF_X ]
VAddr: 0x6000
FirstSec: .dynamic
LastSec: .dynamic
## Case 5: the PT_INTERP segment.
- Type: PT_INTERP
Flags: [ PF_R, PF_W ]
VAddr: 0x3000
FirstSec: .interp
LastSec: .interp
## Case 6: the PT_NOTE segment.
- Type: PT_NOTE
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 7: the PT_SHLIB segment.
- Type: PT_SHLIB
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.begin
## Case 8: the PT_TLS segment.
- Type: PT_TLS
VAddr: 0x4000
FirstSec: .tls
LastSec: .tls
## Case 9: the PT_LOOS segment.
- Type: 0x60000000 ## PT_LOOS
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 10: the PT_GNU_EH_FRAME segment.
- Type: PT_GNU_EH_FRAME
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 11: the PT_SUNW_UNWIND segment.
- Type: 0x6464e550 ## PT_SUNW_UNWIND
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 12: the PT_GNU_STACK segment.
- Type: PT_GNU_STACK
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 13: the PT_GNU_RELRO segment.
- Type: PT_GNU_RELRO
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 14: the PT_GNU_PROPERTY segment.
- Type: PT_GNU_PROPERTY
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 15: the PT_OPENBSD_RANDOMIZE segment.
- Type: 0x65a3dbe6 ## PT_OPENBSD_RANDOMIZE
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 16: the PT_OPENBSD_WXNEEDED segment.
- Type: 0x65a3dbe7 ## PT_OPENBSD_WXNEEDED
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 17: the PT_OPENBSD_BOOTDATA segment.
- Type: 0x65a41be6 ## PT_OPENBSD_BOOTDATA
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 18: the PT_HIOS segment.
- Type: 0x6fffffff ## PT_HIOS
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 19: the PT_LOPROC/PT_ARM_ARCHEXT/PT_MIPS_REGINFO segment.
- Type: 0x70000000 ## PT_LOPROC/PT_ARM_ARCHEXT/PT_MIPS_REGINFO
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 20: the PT_ARM_EXIDX/PT_MIPS_RTPROC segment.
- Type: 0x70000001 ## PT_ARM_EXIDX, PT_MIPS_RTPROC
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 20: the PT_MIPS_OPTIONS segment.
- Type: 0x70000002 ## PT_MIPS_OPTIONS
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 21: the PT_MIPS_ABIFLAGS segment.
- Type: 0x70000003 ## PT_MIPS_ABIFLAGS
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Case 22: the PT_HIPROC segment.
- Type: 0x7fffffff ## PT_HIPROC
VAddr: 0x1000
FirstSec: .foo.begin
LastSec: .foo.end
## Check we report an error / warning when we are unable to read program headers.
## Case A: the e_phentsize field is invalid.
# RUN: yaml2obj --docnum=2 -DPHENTSIZE=1 %s -o %t.phdr.err
# RUN: llvm-objdump --private-headers %t.phdr.err 2>&1 | \
# RUN: FileCheck %s -DFILE=%t.phdr.err --check-prefix=PHENTSIZE
# PHENTSIZE: Program Header:
# PHENTSIZE-NEXT: warning: '[[FILE]]': unable to read program headers: invalid e_phentsize: 1
# PHENTSIZE-NEXT: warning: '[[FILE]]': invalid e_phentsize: 1
# PHENTSIZE-EMPTY:
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
EPhEntSize: [[PHENTSIZE=<none>]]
EPhOff: [[PHOFF=<none>]]
Sections:
- Name: .foo
Type: SHT_PROGBITS
ProgramHeaders:
- Type: PT_PHDR
FirstSec: .foo
LastSec: .foo
## Case B: the value of the e_phoff field is invalid.
## Check that we do not report a warning when the program header table ends right before the end of the file.
## 0x160 + size of headers (56) == file size.
# RUN: yaml2obj --docnum=2 -DPHOFF=0x160 %s -o %t.phdr.no.err2
# RUN: llvm-objdump %t.phdr.no.err2 --private-headers 2>&1 | FileCheck %s --implicit-check-not=warning:
## Check we report a warning / error when e_phoff goes 1 byte past the end of the file.
# RUN: yaml2obj --docnum=2 -DPHOFF=0x161 %s -o %t.phdr.err2
# RUN: llvm-objdump --private-headers %t.phdr.err2 2>&1 | \
# RUN: FileCheck %s -DFILE=%t.phdr.err2 --check-prefix=PHOFF -DOFF=0x161
# PHOFF: Program Header:
# PHOFF-NEXT: warning: '[[FILE]]': unable to read program headers: program headers are longer than binary of size 408: e_phoff = [[OFF]], e_phnum = 1, e_phentsize = 56
# PHOFF-NEXT: warning: '[[FILE]]': program headers are longer than binary of size 408: e_phoff = [[OFF]], e_phnum = 1, e_phentsize = 56
# PHOFF-EMPTY:
## Check we report a warning / error when the value of e_phoff is so large that
## e_phoff + e_phnum * e_phentsize > UINT64_MAX.
# RUN: yaml2obj --docnum=2 -DPHOFF=0xffffffffffffffff %s -o %t.phdr.err3
# RUN: llvm-objdump --private-headers %t.phdr.err3 2>&1 | \
# RUN: FileCheck %s -DFILE=%t.phdr.err3 --check-prefix=PHOFF -DOFF=0xffffffffffffffff
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