forked from OSchip/llvm-project
[ELF][MIPS] R_MIPS_GOT_DISP, R_MIPS_GOT_PAGE, R_MIPS_GOT_OFST relocations support
These relocations introduced by MIPS N64 ABI. R_MIPS_GOT_DISP references GOT entry with full symbol's address, R_MIPS_GOT_PAGE creates GOT entry with address of memory page which includes symbol's address, R_MIPS_GOT_OFST used together with R_MIPS_GOT_PAGE. This relocation calculates offset from beginning of memory page to the symbol address. llvm-svn: 268525
This commit is contained in:
Simon Atanasyan
parent
b192670279
commit
be804559f8
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@ -1252,6 +1252,7 @@ RelExpr MipsTargetInfo<ELFT>::getRelExpr(uint32_t Type,
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return R_PLT;
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case R_MIPS_HI16:
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case R_MIPS_LO16:
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case R_MIPS_GOT_OFST:
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// MIPS _gp_disp designates offset between start of function and 'gp'
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// pointer into GOT. __gnu_local_gp is equal to the current value of
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// the 'gp'. Therefore any relocations against them do not require
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@ -1268,12 +1269,16 @@ RelExpr MipsTargetInfo<ELFT>::getRelExpr(uint32_t Type,
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case R_MIPS_PCLO16:
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return R_PC;
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case R_MIPS_GOT16:
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case R_MIPS_CALL16:
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if (S.isLocal())
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return R_MIPS_GOT_LOCAL;
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// fallthrough
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case R_MIPS_CALL16:
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case R_MIPS_GOT_DISP:
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if (!S.isPreemptible())
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return R_MIPS_GOT;
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return R_GOT_OFF;
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case R_MIPS_GOT_PAGE:
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return R_MIPS_GOT_LOCAL;
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}
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}
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@ -1451,10 +1456,13 @@ void MipsTargetInfo<ELFT>::relocateOne(uint8_t *Loc, uint32_t Type,
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write32<E>(Loc, (Instr & ~0x3ffffff) | (Val >> 2));
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break;
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}
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case R_MIPS_GOT_DISP:
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case R_MIPS_GOT_PAGE:
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case R_MIPS_GOT16:
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checkInt<16>(Val, Type);
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// fallthrough
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case R_MIPS_CALL16:
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case R_MIPS_GOT_OFST:
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writeMipsLo16<E>(Loc, Val);
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break;
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case R_MIPS_GPREL16: {
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@ -1515,7 +1523,7 @@ void MipsTargetInfo<ELFT>::relocateOne(uint8_t *Loc, uint32_t Type,
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template <class ELFT>
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bool MipsTargetInfo<ELFT>::usesOnlyLowPageBits(uint32_t Type) const {
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return Type == R_MIPS_LO16;
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return Type == R_MIPS_LO16 || Type == R_MIPS_GOT_OFST;
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}
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}
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}
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@ -0,0 +1,80 @@
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# Check MIPS N64 ABI GOT relocations
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# RUN: llvm-mc -filetype=obj -triple=mips64-unknown-linux \
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# RUN: %p/Inputs/mips-pic.s -o %t.so.o
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# RUN: llvm-mc -filetype=obj -triple=mips64-unknown-linux %s -o %t.exe.o
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# RUN: ld.lld %t.so.o -shared -o %t.so
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# RUN: ld.lld %t.exe.o %t.so -o %t.exe
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# RUN: llvm-objdump -d -t %t.exe | FileCheck %s
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# RUN: llvm-readobj -r -mips-plt-got %t.exe | FileCheck -check-prefix=GOT %s
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# REQUIRES: mips
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# CHECK: __start:
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# CHECK-NEXT: 20000: df 82 80 20 ld $2, -32736($gp)
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# CHECK-NEXT: 20004: 64 42 00 14 daddiu $2, $2, 20
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# CHECK-NEXT: 20008: 24 42 80 30 addiu $2, $2, -32720
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# CHECK-NEXT: 2000c: 24 42 80 28 addiu $2, $2, -32728
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# CHECK: 0000000000020014 .text 00000000 foo
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# CHECK: 0000000000037ff0 .got 00000000 .hidden _gp
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# CHECK: 0000000000020000 .text 00000000 __start
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# CHECK: 0000000000020010 .text 00000000 bar
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# GOT: Relocations [
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# GOT-NEXT: ]
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# GOT-NEXT: Primary GOT {
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# GOT-NEXT: Canonical gp value: 0x37FF0
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# GOT-NEXT: Reserved entries [
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# GOT-NEXT: Entry {
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# GOT-NEXT: Address: 0x30000
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# GOT-NEXT: Access: -32752
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# GOT-NEXT: Initial: 0x0
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# GOT-NEXT: Purpose: Lazy resolver
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# GOT-NEXT: }
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# GOT-NEXT: Entry {
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# GOT-NEXT: Address: 0x30008
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# GOT-NEXT: Access: -32744
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# GOT-NEXT: Initial: 0x8000000000000000
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# GOT-NEXT: Purpose: Module pointer (GNU extension)
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# GOT-NEXT: }
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# GOT-NEXT: ]
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# GOT-NEXT: Local entries [
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# GOT-NEXT: Entry {
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# GOT-NEXT: Address: 0x30010
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# GOT-NEXT: Access: -32736
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# GOT-NEXT: Initial: 0x20000
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# GOT-NEXT: }
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# GOT-NEXT: Entry {
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# GOT-NEXT: Address: 0x30018
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# GOT-NEXT: Access: -32728
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# GOT-NEXT: Initial: 0x20010
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# GOT-NEXT: }
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# GOT-NEXT: ]
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# GOT-NEXT: Global entries [
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# GOT-NEXT: Entry {
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# GOT-NEXT: Address: 0x30020
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# GOT-NEXT: Access: -32720
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# GOT-NEXT: Initial: 0x0
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# GOT-NEXT: Value: 0x0
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# GOT-NEXT: Type: Function
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# GOT-NEXT: Section: Undefined
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# GOT-NEXT: Name: foo1a
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# GOT-NEXT: }
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# GOT-NEXT: ]
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# GOT-NEXT: Number of TLS and multi-GOT entries: 0
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# GOT-NEXT: }
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.text
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.global __start, bar
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__start:
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ld $v0,%got_page(foo)($gp) # R_MIPS_GOT_PAGE
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daddiu $v0,$v0,%got_ofst(foo) # R_MIPS_GOT_OFST
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addiu $v0,$v0,%got_disp(foo1a) # R_MIPS_GOT_DISP
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addiu $v0,$v0,%got_disp(bar) # R_MIPS_GOT_DISP
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bar:
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nop
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foo:
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nop
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