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cmd/link: Add section data slice to Archrelocvariant

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PPC64 needs to preserve bits when applying some relocations. DS form
relocations must preserve the lower two bits, and thus needs to inspect
the section data as it streams out.

Similarly, the overflow checking requires inspecting the primary
opcode to see if the value is sign or zero extended.

The existing PPC64 code no longer works as the slice returned by
(loader*).Data is cleared as we layout the symbol and process
relocations.  This data is always the section undergoing relocation,
thus we can directly inspect the contents to preserve bits or
check for overflows.

Change-Id: I239211f7e5e96208673663b6553b3017adae7e01
Reviewed-on: https://go-review.googlesource.com/c/go/+/300555
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
This commit is contained in:
Paul E. Murphy 2021-03-10 15:10:05 -06:00 committed by Lynn Boger
parent b95e4b7850
commit e4253cd023
11 changed files with 18 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/cmd/link/internal/amd64/asm.go
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@ -548,7 +548,7 @@ func archreloc(*ld.Target, *loader.Loader, *ld.ArchSyms, loader.Reloc, loader.Sy
return -1, 0, false
}
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64) int64 {
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64, []byte) int64 {
log.Fatalf("unexpected relocation variant")
return -1
}

2
src/cmd/link/internal/arm/asm.go
View File

@ -565,7 +565,7 @@ func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loade
return val, 0, false
}
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64) int64 {
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64, []byte) int64 {
log.Fatalf("unexpected relocation variant")
return -1
}

2
src/cmd/link/internal/arm64/asm.go
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@ -865,7 +865,7 @@ func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loade
return val, 0, false
}
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64) int64 {
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64, []byte) int64 {
log.Fatalf("unexpected relocation variant")
return -1
}

2
src/cmd/link/internal/ld/data.go
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@ -507,7 +507,7 @@ func (st *relocSymState) relocsym(s loader.Sym, P []byte) {
if target.IsPPC64() || target.IsS390X() {
if rv != sym.RV_NONE {
o = thearch.Archrelocvariant(target, ldr, r, rv, s, o)
o = thearch.Archrelocvariant(target, ldr, r, rv, s, o, P)
}
}

2
src/cmd/link/internal/ld/lib.go
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@ -223,7 +223,7 @@ type Arch struct {
// to-be-relocated data item (from sym.P). Return is an updated
// offset value.
Archrelocvariant func(target *Target, ldr *loader.Loader, rel loader.Reloc,
rv sym.RelocVariant, sym loader.Sym, offset int64) (relocatedOffset int64)
rv sym.RelocVariant, sym loader.Sym, offset int64, data []byte) (relocatedOffset int64)
// Generate a trampoline for a call from s to rs if necessary. ri is
// index of the relocation.

2
src/cmd/link/internal/mips/asm.go
View File

@ -140,7 +140,7 @@ func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loade
return val, 0, false
}
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64) int64 {
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64, []byte) int64 {
return -1
}

2
src/cmd/link/internal/mips64/asm.go
View File

@ -138,7 +138,7 @@ func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loade
return val, 0, false
}
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64) int64 {
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64, []byte) int64 {
return -1
}

15
src/cmd/link/internal/ppc64/asm.go
View File

@ -859,7 +859,7 @@ func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loade
return val, nExtReloc, false
}
func archrelocvariant(target *ld.Target, ldr *loader.Loader, r loader.Reloc, rv sym.RelocVariant, s loader.Sym, t int64) (relocatedOffset int64) {
func archrelocvariant(target *ld.Target, ldr *loader.Loader, r loader.Reloc, rv sym.RelocVariant, s loader.Sym, t int64, p []byte) (relocatedOffset int64) {
rs := ldr.ResolveABIAlias(r.Sym())
switch rv & sym.RV_TYPE_MASK {
default:
@ -875,9 +875,10 @@ func archrelocvariant(target *ld.Target, ldr *loader.Loader, r loader.Reloc, rv
// overflow depends on the instruction
var o1 uint32
if target.IsBigEndian() {
o1 = binary.BigEndian.Uint32(ldr.Data(s)[r.Off()-2:])
o1 = binary.BigEndian.Uint32(p[r.Off()-2:])
} else {
o1 = binary.LittleEndian.Uint32(ldr.Data(s)[r.Off():])
o1 = binary.LittleEndian.Uint32(p[r.Off():])
}
switch o1 >> 26 {
case 24, // ori
@ -909,9 +910,9 @@ func archrelocvariant(target *ld.Target, ldr *loader.Loader, r loader.Reloc, rv
// overflow depends on the instruction
var o1 uint32
if target.IsBigEndian() {
o1 = binary.BigEndian.Uint32(ldr.Data(s)[r.Off()-2:])
o1 = binary.BigEndian.Uint32(p[r.Off()-2:])
} else {
o1 = binary.LittleEndian.Uint32(ldr.Data(s)[r.Off():])
o1 = binary.LittleEndian.Uint32(p[r.Off():])
}
switch o1 >> 26 {
case 25, // oris
@ -933,9 +934,9 @@ func archrelocvariant(target *ld.Target, ldr *loader.Loader, r loader.Reloc, rv
case sym.RV_POWER_DS:
var o1 uint32
if target.IsBigEndian() {
o1 = uint32(binary.BigEndian.Uint16(ldr.Data(s)[r.Off():]))
o1 = uint32(binary.BigEndian.Uint16(p[r.Off():]))
} else {
o1 = uint32(binary.LittleEndian.Uint16(ldr.Data(s)[r.Off():]))
o1 = uint32(binary.LittleEndian.Uint16(p[r.Off():]))
}
if t&3 != 0 {
ldr.Errorf(s, "relocation for %s+%d is not aligned: %d", ldr.SymName(rs), r.Off(), t)

2
src/cmd/link/internal/riscv64/asm.go
View File

@ -230,7 +230,7 @@ func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loade
return val, 0, false
}
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64) int64 {
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64, []byte) int64 {
log.Fatalf("archrelocvariant")
return -1
}

2
src/cmd/link/internal/s390x/asm.go
View File

@ -371,7 +371,7 @@ func archreloc(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, r loade
return val, 0, false
}
func archrelocvariant(target *ld.Target, ldr *loader.Loader, r loader.Reloc, rv sym.RelocVariant, s loader.Sym, t int64) int64 {
func archrelocvariant(target *ld.Target, ldr *loader.Loader, r loader.Reloc, rv sym.RelocVariant, s loader.Sym, t int64, p []byte) int64 {
switch rv & sym.RV_TYPE_MASK {
default:
ldr.Errorf(s, "unexpected relocation variant %d", rv)

2
src/cmd/link/internal/x86/asm.go
View File

@ -415,7 +415,7 @@ func archreloc(*ld.Target, *loader.Loader, *ld.ArchSyms, loader.Reloc, loader.Sy
return -1, 0, false
}
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64) int64 {
func archrelocvariant(*ld.Target, *loader.Loader, loader.Reloc, sym.RelocVariant, loader.Sym, int64, []byte) int64 {
log.Fatalf("unexpected relocation variant")
return -1
}