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[ExecutionEngine] Correct the size of a write in a COFF i386 relocation

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We want to be writing a 32bit value, so we should be writing 4 bytes
instead of 2.

Patch by Alex Langford <apl@fb.com>.

Differential Revision: https://reviews.llvm.org/D38872

llvm-svn: 315964
This commit is contained in:
Shoaib Meenai 2017-10-17 01:41:14 +00:00
parent 200728ffcb
commit 81eb39490f
2 changed files with 12 additions and 8 deletions
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2
lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldCOFFI386.h
View File

@ -209,7 +209,7 @@ public:
DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
<< " RelType: IMAGE_REL_I386_SECREL Value: " << RE.Addend
<< '\n');
writeBytesUnaligned(RE.Addend, Target, 2);
writeBytesUnaligned(RE.Addend, Target, 4);
break;
default:
llvm_unreachable("unsupported relocation type");

18
test/ExecutionEngine/RuntimeDyld/X86/COFF_i386.s
View File

@ -49,11 +49,6 @@ __imp__ExitProcess:
.long "_ExitProcess@4" // IMAGE_REL_I386_DIR32
# rtdyld-check: *{4}__imp__ExitProcess = 0xffffffff
.global string
.align 1
string:
.asciz "Hello World!\n"
.global relocations
relocations:
rel5:
@ -63,8 +58,8 @@ rel6:
# rtdyld-check: *{2}rel6 = 1
.secidx __imp__OutputDebugStringA // IMAGE_REL_I386_SECTION
rel7:
# rtdyld-check: *{4}rel7 = relocations - section_addr(COFF_i386.s.tmp.obj, .data)
.secrel32 relocations // IMAGE_REL_I386_SECREL
# rtdyld-check: *{4}rel7 = string - section_addr(COFF_i386.s.tmp.obj, .data)
.secrel32 string // IMAGE_REL_I386_SECREL
# Test that addends work.
rel8:
@ -79,3 +74,12 @@ rel10:
rel11:
# rtdyld-check: *{4}rel11 = string - section_addr(COFF_i386.s.tmp.obj, .data) + 1
.long string@SECREL32+1 // IMAGE_REL_I386_SECREL
# We explicitly add padding to put string outside of the 16bit address space
# (absolute and as an offset from .data), so that relocations involving
# 32bit addresses / offsets are not accidentally truncated to 16 bits.
.space 65536
.global string
.align 1
string:
.asciz "Hello World!\n"