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[ELF] Support R_PPC64_ADDR16_HIGH 

R_PPC64_ADDR16_HI represents bits 16-31 of a 32-bit value
R_PPC64_ADDR16_HIGH represents bits 16-31 of a 64-bit value.

In the Linux kernel, `LOAD_REG_IMMEDIATE_SYM` defined in `arch/powerpc/include/asm/ppc_asm.h`
uses @l, @high, @higher, @highest to load the 64-bit value of a symbol.

Fixes https://github.com/ClangBuiltLinux/linux/issues/1260
This commit is contained in:
Fangrui Song 2021-01-19 11:42:52 -08:00
parent e12e0d66c0
commit 5fcb412ed0
3 changed files with 11 additions and 0 deletions
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4
lld/ELF/Arch/PPC64.cpp
View File

@ -948,6 +948,7 @@ RelExpr PPC64::getRelExpr(RelType type, const Symbol &s,
case R_PPC64_ADDR16_DS:
case R_PPC64_ADDR16_HA:
case R_PPC64_ADDR16_HI:
case R_PPC64_ADDR16_HIGH:
case R_PPC64_ADDR16_HIGHER:
case R_PPC64_ADDR16_HIGHERA:
case R_PPC64_ADDR16_HIGHEST:
@ -1230,6 +1231,9 @@ void PPC64::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
checkInt(loc, val, 32, rel);
write16(loc, hi(val));
break;
case R_PPC64_ADDR16_HIGH:
write16(loc, hi(val));
break;
case R_PPC64_ADDR16_HIGHER:
case R_PPC64_TPREL16_HIGHER:
write16(loc, higher(val));

5
lld/test/ELF/ppc64-reloc-addr.s
View File

@ -25,6 +25,11 @@
.section .R_PPC64_ADDR16_HA,"ax",@progbits
lis 4, b@ha
# CHECK-LABEL: <.R_PPC64_ADDR16_HIGH>:
# CHECK-NEXT: lis 4, -30293
.section .R_PPC64_ADDR16_HIGH,"ax",@progbits
lis 4, a@high
# CHECK-LABEL: <.R_PPC64_ADDR16_HIGHER>:
# CHECK-NEXT: li 3, 17767
.section .R_PPC64_ADDR16_HIGHER,"ax",@progbits

2
lld/test/ELF/ppc64-reloc-addr16-err.s
View File

@ -18,3 +18,5 @@ lis 4, a@h # R_PPC64_ADDR16_HI
.ifdef HA
lis 4, a@ha # R_PPC64_ADDR16_HA
.endif
lis 4, a@high # R_PPC64_ADDR16_HIGH