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[ELF/AArch64] Add support for R_AARCH64_LDST16_ABS_LO12_NC relocation. 

Found while trying to self-host the toolchain that libLTO needs it.

llvm-svn: 257854
This commit is contained in:
Davide Italiano 2016-01-15 01:49:51 +00:00
parent 2c22a86f94
commit 2dfc5fd1ea
2 changed files with 18 additions and 0 deletions
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4
lld/ELF/Target.cpp
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@ -1271,6 +1271,7 @@ bool AArch64TargetInfo::needsCopyRel(uint32_t Type, const SymbolBody &S) const {
case R_AARCH64_ADR_PREL_LO21:
case R_AARCH64_ADR_PREL_PG_HI21:
case R_AARCH64_LDST8_ABS_LO12_NC:
case R_AARCH64_LDST16_ABS_LO12_NC:
case R_AARCH64_LDST32_ABS_LO12_NC:
case R_AARCH64_LDST64_ABS_LO12_NC:
case R_AARCH64_LDST128_ABS_LO12_NC:
@ -1384,6 +1385,9 @@ void AArch64TargetInfo::relocateOne(uint8_t *Loc, uint8_t *BufEnd,
case R_AARCH64_LDST128_ABS_LO12_NC:
or32le(Loc, (SA & 0x0FF8) << 6);
break;
case R_AARCH64_LDST16_ABS_LO12_NC:
or32le(Loc, (SA & 0x0FFC) << 9);
break;
case R_AARCH64_LDST8_ABS_LO12_NC:
or32le(Loc, (SA & 0xFFF) << 10);
break;

14
lld/test/ELF/aarch64-relocs.s
View File

@ -136,3 +136,17 @@ foo128:
# CHECK: 1104c: 74 16 c0 3d ldr q20, [x19, #80]
#foo128:
# 11050: 66 6f 6f 00 .word
.section .R_AARCH64_LDST16_ABS_LO12_NC,"ax",@progbits
ldst16:
ldr h17, [x19, :lo12:foo16]
foo16:
.asciz "foo"
.size mystr, 3
# S = 0x11054, A = 0x4
# R = ((S + A) & 0x0FFC) << 9 = 0xb000
# 0xb000 | 0x7d400271 = 0x7d40b271
# CHECK: Disassembly of section .R_AARCH64_LDST16_ABS_LO12_NC:
# CHECK-NEXT: ldst16:
# CHECK-NEXT: 11054: 71 b2 40 7d ldr h17, [x19, #88]