Commit e93870c1 by Ian Lance Taylor

re PR go/65417 (debug/elf: lacks support for PPC relocations)

	PR go/65417
debug/elf: support reading debug info from 32-bit PPC objects

This is a backport of http://golang.org/7590 from the master
Go library.

From-SVN: r221644
parent ab24432b
...@@ -532,6 +532,9 @@ func (f *File) applyRelocations(dst []byte, rels []byte) error { ...@@ -532,6 +532,9 @@ func (f *File) applyRelocations(dst []byte, rels []byte) error {
if f.Class == ELFCLASS64 && f.Machine == EM_AARCH64 { if f.Class == ELFCLASS64 && f.Machine == EM_AARCH64 {
return f.applyRelocationsARM64(dst, rels) return f.applyRelocationsARM64(dst, rels)
} }
if f.Class == ELFCLASS32 && f.Machine == EM_PPC {
return f.applyRelocationsPPC(dst, rels)
}
if f.Class == ELFCLASS64 && f.Machine == EM_PPC64 { if f.Class == ELFCLASS64 && f.Machine == EM_PPC64 {
return f.applyRelocationsPPC64(dst, rels) return f.applyRelocationsPPC64(dst, rels)
} }
...@@ -677,6 +680,46 @@ func (f *File) applyRelocationsARM64(dst []byte, rels []byte) error { ...@@ -677,6 +680,46 @@ func (f *File) applyRelocationsARM64(dst []byte, rels []byte) error {
return nil return nil
} }
func (f *File) applyRelocationsPPC(dst []byte, rels []byte) error {
// 12 is the size of Rela32.
if len(rels)%12 != 0 {
return errors.New("length of relocation section is not a multiple of 12")
}
symbols, _, err := f.getSymbols(SHT_SYMTAB)
if err != nil {
return err
}
b := bytes.NewReader(rels)
var rela Rela32
for b.Len() > 0 {
binary.Read(b, f.ByteOrder, &rela)
symNo := rela.Info >> 8
t := R_PPC(rela.Info & 0xff)
if symNo == 0 || symNo > uint32(len(symbols)) {
continue
}
sym := &symbols[symNo-1]
if SymType(sym.Info&0xf) != STT_SECTION {
// We don't handle non-section relocations for now.
continue
}
switch t {
case R_PPC_ADDR32:
if rela.Off+4 >= uint32(len(dst)) || rela.Addend < 0 {
continue
}
f.ByteOrder.PutUint32(dst[rela.Off:rela.Off+4], uint32(rela.Addend))
}
}
return nil
}
func (f *File) applyRelocationsPPC64(dst []byte, rels []byte) error { func (f *File) applyRelocationsPPC64(dst []byte, rels []byte) error {
// 24 is the size of Rela64. // 24 is the size of Rela64.
if len(rels)%24 != 0 { if len(rels)%24 != 0 {
......
...@@ -261,6 +261,12 @@ var relocationTests = []relocationTest{ ...@@ -261,6 +261,12 @@ var relocationTests = []relocationTest{
}, },
}, },
{ {
"testdata/go-relocation-test-gcc5-ppc.obj",
[]relocationTestEntry{
{0, &dwarf.Entry{Offset: 0xb, Tag: dwarf.TagCompileUnit, Children: true, Field: []dwarf.Field{dwarf.Field{Attr: dwarf.AttrProducer, Val: "GNU C11 5.0.0 20150116 (experimental) -Asystem=linux -Asystem=unix -Asystem=posix -g"}, dwarf.Field{Attr: dwarf.AttrLanguage, Val: int64(12)}, dwarf.Field{Attr: dwarf.AttrName, Val: "go-relocation-test-gcc5-ppc.c"}, dwarf.Field{Attr: dwarf.AttrCompDir, Val: "/tmp"}, dwarf.Field{Attr: dwarf.AttrLowpc, Val: uint64(0x0)}, dwarf.Field{Attr: dwarf.AttrHighpc, Val: int64(0x44)}, dwarf.Field{Attr: dwarf.AttrStmtList, Val: int64(0)}}}},
},
},
{
"testdata/go-relocation-test-gcc482-ppc64le.obj", "testdata/go-relocation-test-gcc482-ppc64le.obj",
[]relocationTestEntry{ []relocationTestEntry{
{0, &dwarf.Entry{Offset: 0xb, Tag: dwarf.TagCompileUnit, Children: true, Field: []dwarf.Field{dwarf.Field{Attr: dwarf.AttrProducer, Val: "GNU C 4.8.2 -Asystem=linux -Asystem=unix -Asystem=posix -msecure-plt -mtune=power8 -mcpu=power7 -gdwarf-2 -fstack-protector"}, dwarf.Field{Attr: dwarf.AttrLanguage, Val: int64(1)}, dwarf.Field{Attr: dwarf.AttrName, Val: "go-relocation-test-gcc482-ppc64le.c"}, dwarf.Field{Attr: dwarf.AttrCompDir, Val: "/tmp"}, dwarf.Field{Attr: dwarf.AttrLowpc, Val: uint64(0x0)}, dwarf.Field{Attr: dwarf.AttrHighpc, Val: uint64(0x24)}, dwarf.Field{Attr: dwarf.AttrStmtList, Val: int64(0)}}}}, {0, &dwarf.Entry{Offset: 0xb, Tag: dwarf.TagCompileUnit, Children: true, Field: []dwarf.Field{dwarf.Field{Attr: dwarf.AttrProducer, Val: "GNU C 4.8.2 -Asystem=linux -Asystem=unix -Asystem=posix -msecure-plt -mtune=power8 -mcpu=power7 -gdwarf-2 -fstack-protector"}, dwarf.Field{Attr: dwarf.AttrLanguage, Val: int64(1)}, dwarf.Field{Attr: dwarf.AttrName, Val: "go-relocation-test-gcc482-ppc64le.c"}, dwarf.Field{Attr: dwarf.AttrCompDir, Val: "/tmp"}, dwarf.Field{Attr: dwarf.AttrLowpc, Val: uint64(0x0)}, dwarf.Field{Attr: dwarf.AttrHighpc, Val: uint64(0x24)}, dwarf.Field{Attr: dwarf.AttrStmtList, Val: int64(0)}}}},
......
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