https://sourceware.org/bugzilla/show_bug.cgi?id=33624
Bug ID: 33624
Summary: ld (BFD) misses support for the AMD HSA ELF format
Product: binutils
Version: 2.43.1
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
Currently GCC to AMD GCN GPU offload relies on both the llvm assembler and the
lld linker. readelf knows AMD HSA, an example report from an object file is
ELF Header:
Magic: 7f 45 4c 46 02 01 01 40 02 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: AMD HSA
ABI Version: 2
Type: REL (Relocatable file)
Machine: AMD GPU
Version: 0x1
Entry point address: 0x0
Start of program headers: 0 (bytes into file)
Start of section headers: 1792 (bytes into file)
Flags: 0x45, gfx1036
Size of this header: 64 (bytes)
Size of program headers: 0 (bytes)
Number of program headers: 0
Size of section headers: 64 (bytes)
Number of section headers: 12
Section header string table index: 1
...
Relocation section '.rela.text' at offset 0x4f0 contains 8 entries:
Offset Info Type Sym. Value Sym. Name +
Addend
0000000000a8 00030000000a R_AMDGPU_REL32_LO 0000000000000000 .data.rel.local +
24
0000000000b0 00030000000b R_AMDGPU_REL32_HI 0000000000000000 .data.rel.local +
24
...
Relocation section '.rela.debug_frame' at offset 0x610 contains 4 entries:
Offset Info Type Sym. Value Sym. Name +
Addend
00000000002c 000500000006 R_AMDGPU_ABS32 0000000000000000 .debug_frame + 0
000000000030 000100000003 R_AMDGPU_ABS64 0000000000000000 .text + 0
00000000006c 000500000006 R_AMDGPU_ABS32 0000000000000000 .debug_frame + 0
000000000070 000100000003 R_AMDGPU_ABS64 0000000000000000 .text + 124
but BFD tools report
> objdump -r ../../offload/obj-gcn/gcc/testsuite/gcc/pr66343-1.o
../../offload/obj-gcn/gcc/testsuite/gcc/pr66343-1.o: file format
elf64-little
RELOCATION RECORDS FOR [.text]:
OFFSET TYPE VALUE
00000000000000a8 UNKNOWN .data.rel.local+0x0000000000000024
00000000000000b0 UNKNOWN .data.rel.local+0x0000000000000024
...
and ld support is non-existant.
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