mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-17 15:56:40 +00:00
a169d4c2e9
When then linker creates runtime pseudo relocations, it places them in a list with the assumption that the runtime will fix these relocations later, when the image gets loaded. If the relevant runtime function doesn't seem to be present in the linked image, error out. Normally when linking the mingw-w64 runtime libraries, this function always is available. However, if linking without including the mingw-w64 CRT startup files, and the image needs runtime pseudo relocations, make it clear that this won't work as expected at runtime. With ld.bfd, this situation is a hard error too; ld.bfd adds an undefined reference to this symbol if runtime pseudo relocations are needed. A later alternative would be to actually try to pull in the symbol (if seen in a static library, but not included yet). This would allow decoupling the function from the main mingw-w64 CRT startup code (making it optional, only running if the linker actually produced runtime pseudo relocations). Doing that would require restructuring the lld code (gathering pseudo relocations earlier, then loading the relocator function, then pulling in more object files to satisfy the dependencies of the relocator) though. Also, ld.bfd doesn't currently successfully pull in more object files to satisfy the dependency on _pei386_runtime_relocator, so with that in mind, there's not much extra value in making LLD do it currently either; we can't make such a change in mingw-w64's CRT until both linkers handle it. This fixes one issue brought up in https://github.com/llvm/llvm-project/issues/84424.
46 lines
1.6 KiB
ArmAsm
46 lines
1.6 KiB
ArmAsm
# REQUIRES: arm
|
|
|
|
# RUN: echo -e ".global variable\n.global DllMainCRTStartup\n.thumb\n.text\nDllMainCRTStartup:\nbx lr\n.data\nvariable:\n.long 42" > %t-lib.s
|
|
# RUN: llvm-mc -triple=armv7-windows-gnu %t-lib.s -filetype=obj -o %t-lib.obj
|
|
# RUN: lld-link -out:%t-lib.dll -dll -entry:DllMainCRTStartup %t-lib.obj -lldmingw -implib:%t-lib.lib
|
|
|
|
# RUN: llvm-mc -triple=armv7-windows-gnu %s -filetype=obj -o %t.obj
|
|
# RUN: lld-link -lldmingw -out:%t.exe -entry:main %t.obj %t-lib.lib -verbose
|
|
|
|
# RUN: llvm-readobj --coff-imports %t.exe | FileCheck -check-prefix=IMPORTS %s
|
|
# RUN: llvm-objdump -s %t.exe | FileCheck --check-prefix=CONTENTS %s
|
|
|
|
# IMPORTS: Import {
|
|
# IMPORTS-NEXT: Name: autoimport-arm-data.s.tmp-lib.dll
|
|
# IMPORTS-NEXT: ImportLookupTableRVA: 0x2050
|
|
# IMPORTS-NEXT: ImportAddressTableRVA: 0x2058
|
|
# IMPORTS-NEXT: Symbol: variable (0)
|
|
# IMPORTS-NEXT: }
|
|
|
|
# Runtime pseudo reloc list header consisting of 0x0, 0x0, 0x1.
|
|
# First runtime pseudo reloc, with import from 0x2058,
|
|
# applied at 0x3000, with a size of 32 bits.
|
|
# CONTENTS: Contents of section .rdata:
|
|
# CONTENTS: 402000 00000000 00000000 01000000 58200000
|
|
# CONTENTS: 402010 00300000 20000000
|
|
# ptr: pointing at the IAT RVA at 0x2058
|
|
# relocs: pointing at the runtime pseudo reloc list at
|
|
# 0x2000 - 0x2018.
|
|
# CONTENTS: Contents of section .data:
|
|
# CONTENTS: 403000 58204000 00204000 18204000
|
|
|
|
.global main
|
|
.text
|
|
.thumb
|
|
main:
|
|
bx lr
|
|
.global _pei386_runtime_relocator
|
|
_pei386_runtime_relocator:
|
|
bx lr
|
|
.data
|
|
ptr:
|
|
.long variable
|
|
relocs:
|
|
.long __RUNTIME_PSEUDO_RELOC_LIST__
|
|
.long __RUNTIME_PSEUDO_RELOC_LIST_END__
|