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[MC][X86] Support .reloc *, BFD_RELOC_{NONE,8,16,32,64}, *

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The names are unfortunate, but BFD_RELOC_NONE provides a generic way indicating
a dependency between two sections, which is useful for ld --gc-sections.
See https://sourceware.org/bugzilla/show_bug.cgi?id=27530
This commit is contained in:
Fangrui Song 2021-03-05 21:01:32 -08:00
parent 073a491a84
commit d0c3033896
3 changed files with 38 additions and 0 deletions
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9
lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
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@ -680,12 +680,21 @@ Optional<MCFixupKind> X86AsmBackend::getFixupKind(StringRef Name) const {
#define ELF_RELOC(X, Y) .Case(#X, Y) #define ELF_RELOC(X, Y) .Case(#X, Y)
#include "llvm/BinaryFormat/ELFRelocs/x86_64.def" #include "llvm/BinaryFormat/ELFRelocs/x86_64.def"
#undef ELF_RELOC #undef ELF_RELOC
.Case("BFD_RELOC_NONE", ELF::R_X86_64_NONE)
.Case("BFD_RELOC_8", ELF::R_X86_64_8)
.Case("BFD_RELOC_16", ELF::R_X86_64_16)
.Case("BFD_RELOC_32", ELF::R_X86_64_32)
.Case("BFD_RELOC_64", ELF::R_X86_64_64)
.Default(-1u); .Default(-1u);
} else { } else {
Type = llvm::StringSwitch<unsigned>(Name) Type = llvm::StringSwitch<unsigned>(Name)
#define ELF_RELOC(X, Y) .Case(#X, Y) #define ELF_RELOC(X, Y) .Case(#X, Y)
#include "llvm/BinaryFormat/ELFRelocs/i386.def" #include "llvm/BinaryFormat/ELFRelocs/i386.def"
#undef ELF_RELOC #undef ELF_RELOC
.Case("BFD_RELOC_NONE", ELF::R_386_NONE)
.Case("BFD_RELOC_8", ELF::R_386_8)
.Case("BFD_RELOC_16", ELF::R_386_16)
.Case("BFD_RELOC_32", ELF::R_386_32)
.Default(-1u); .Default(-1u);
} }
if (Type == -1u) if (Type == -1u)

13
test/MC/X86/reloc-directive-elf-32.s
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@ -10,6 +10,10 @@
# PRINT-NEXT: .reloc 0, R_386_32, .data+2 # PRINT-NEXT: .reloc 0, R_386_32, .data+2
# PRINT-NEXT: .reloc 0, R_386_IRELATIVE, foo+3 # PRINT-NEXT: .reloc 0, R_386_IRELATIVE, foo+3
# PRINT-NEXT: .reloc 0, R_386_GOT32X, 5 # PRINT-NEXT: .reloc 0, R_386_GOT32X, 5
# PRINT-NEXT: .reloc 0, BFD_RELOC_NONE, 9
# PRINT-NEXT: .reloc 0, BFD_RELOC_8, 9
# PRINT-NEXT: .reloc 0, BFD_RELOC_16, 9
# PRINT-NEXT: .reloc 0, BFD_RELOC_32, 9
# X86 relocations use the Elf32_Rel format. Addends are neither stored in the # X86 relocations use the Elf32_Rel format. Addends are neither stored in the
# relocation entries nor applied in the referenced locations. # relocation entries nor applied in the referenced locations.
@ -19,6 +23,10 @@
# CHECK-NEXT: 0x0 R_386_32 .data # CHECK-NEXT: 0x0 R_386_32 .data
# CHECK-NEXT: 0x0 R_386_IRELATIVE foo # CHECK-NEXT: 0x0 R_386_IRELATIVE foo
# CHECK-NEXT: 0x0 R_386_GOT32X - # CHECK-NEXT: 0x0 R_386_GOT32X -
# CHECK-NEXT: 0x0 R_386_NONE -
# CHECK-NEXT: 0x0 R_386_8 -
# CHECK-NEXT: 0x0 R_386_16 -
# CHECK-NEXT: 0x0 R_386_32 -
# HEX: 0x00000000 00000000 00000000 # HEX: 0x00000000 00000000 00000000
@ -33,6 +41,11 @@
.reloc 0, R_386_IRELATIVE, foo+3 .reloc 0, R_386_IRELATIVE, foo+3
.reloc 0, R_386_GOT32X, 5 .reloc 0, R_386_GOT32X, 5
.reloc 0, BFD_RELOC_NONE, 9
.reloc 0, BFD_RELOC_8, 9
.reloc 0, BFD_RELOC_16, 9
.reloc 0, BFD_RELOC_32, 9
.data .data
.globl foo .globl foo
foo: foo:

16
test/MC/X86/reloc-directive-elf-64.s
View File

@ -9,6 +9,11 @@
# PRINT-NEXT: .reloc 0, R_X86_64_64, .data+2 # PRINT-NEXT: .reloc 0, R_X86_64_64, .data+2
# PRINT-NEXT: .reloc 0, R_X86_64_GOTPCRELX, foo+3 # PRINT-NEXT: .reloc 0, R_X86_64_GOTPCRELX, foo+3
# PRINT-NEXT: .reloc 0, R_X86_64_REX_GOTPCRELX, 5 # PRINT-NEXT: .reloc 0, R_X86_64_REX_GOTPCRELX, 5
# PRINT-NEXT: .reloc 0, BFD_RELOC_NONE, 9
# PRINT-NEXT: .reloc 0, BFD_RELOC_8, 9
# PRINT-NEXT: .reloc 0, BFD_RELOC_16, 9
# PRINT-NEXT: .reloc 0, BFD_RELOC_32, 9
# PRINT-NEXT: .reloc 0, BFD_RELOC_64, 9
# CHECK: 0x2 R_X86_64_NONE .data 0x0 # CHECK: 0x2 R_X86_64_NONE .data 0x0
# CHECK-NEXT: 0x1 R_X86_64_NONE foo 0x4 # CHECK-NEXT: 0x1 R_X86_64_NONE foo 0x4
@ -16,6 +21,11 @@
# CHECK-NEXT: 0x0 R_X86_64_64 .data 0x2 # CHECK-NEXT: 0x0 R_X86_64_64 .data 0x2
# CHECK-NEXT: 0x0 R_X86_64_GOTPCRELX foo 0x3 # CHECK-NEXT: 0x0 R_X86_64_GOTPCRELX foo 0x3
# CHECK-NEXT: 0x0 R_X86_64_REX_GOTPCRELX - 0x5 # CHECK-NEXT: 0x0 R_X86_64_REX_GOTPCRELX - 0x5
# CHECK-NEXT: 0x0 R_X86_64_NONE - 0x9
# CHECK-NEXT: 0x0 R_X86_64_8 - 0x9
# CHECK-NEXT: 0x0 R_X86_64_16 - 0x9
# CHECK-NEXT: 0x0 R_X86_64_32 - 0x9
# CHECK-NEXT: 0x0 R_X86_64_64 - 0x9
.text .text
ret ret
@ -28,6 +38,12 @@
.reloc 0, R_X86_64_GOTPCRELX, foo+3 .reloc 0, R_X86_64_GOTPCRELX, foo+3
.reloc 0, R_X86_64_REX_GOTPCRELX, 5 .reloc 0, R_X86_64_REX_GOTPCRELX, 5
.reloc 0, BFD_RELOC_NONE, 9
.reloc 0, BFD_RELOC_8, 9
.reloc 0, BFD_RELOC_16, 9
.reloc 0, BFD_RELOC_32, 9
.reloc 0, BFD_RELOC_64, 9
.data .data
.globl foo .globl foo
foo: foo: