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cmd/link: simplify PE relocations mapping

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The code for mapping Windows PE relocations to Go relocations was
difficult to follow and contains some duplicated code. Also, it was
mapping IMAGE_REL_AMD64_ADDR32 to R_PCREL instead of R_ADDR.

This CL commit simplifies the code and fixes the mapping. I haven't been
able to coerce mingw-w64 to generate IMAGE_REL_AMD64_ADDR32 relocations,
so I haven't been able to test this change. However, the previous
implementation was clearly wrong.

While here, remove code supporting the unsupported windows/arm support.

Updates #71671
Updates #75485

Change-Id: Id0d6f352fa7d5df9e00509fcdf09ca0cb91ca524
Reviewed-on: https://go-review.googlesource.com/c/go/+/672155
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
qmuntal 2025-05-13 11:24:30 +02:00 • committed by Quim Muntal
parent 9df1a289ac
commit 594deca981
1 changed files with 37 additions and 73 deletions
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98
src/cmd/link/internal/loadpe/ldpe.go
View file

@ -17,6 +17,7 @@ import (
"errors"
"fmt"
"io"
"strconv"
"strings"
)
@ -348,11 +349,11 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
return nil, fmt.Errorf("relocation number %d symbol index idx=%d cannot be large then number of symbols %d", j, r.SymbolTableIndex, len(f.COFFSymbols))
}
pesym := &f.COFFSymbols[r.SymbolTableIndex]
_, gosym, err := state.readpesym(pesym)
_, rSym, err := state.readpesym(pesym)
if err != nil {
return nil, err
}
if gosym == 0 {
if rSym == 0 {
name, err := pesym.FullName(f.StringTable)
if err != nil {
name = string(pesym.Name[:])
@ -360,90 +361,53 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
return nil, fmt.Errorf("reloc of invalid sym %s idx=%d type=%d", name, r.SymbolTableIndex, pesym.Type)
}
rSym := gosym
rSize := uint8(4)
rOff := int32(r.VirtualAddress)
var rAdd int64
var rType objabi.RelocType
switch arch.Family {
default:
return nil, fmt.Errorf("%s: unsupported arch %v", pn, arch.Family)
case sys.I386, sys.AMD64:
case sys.I386:
switch r.Type {
default:
return nil, fmt.Errorf("%s: %v: unknown relocation type %v", pn, state.sectsyms[rsect], r.Type)
case IMAGE_REL_I386_REL32, IMAGE_REL_AMD64_REL32,
IMAGE_REL_AMD64_ADDR32, // R_X86_64_PC32
IMAGE_REL_AMD64_ADDR32NB:
if r.Type == IMAGE_REL_AMD64_ADDR32NB {
rType = objabi.R_PEIMAGEOFF
} else {
case IMAGE_REL_I386_REL32:
rType = objabi.R_PCREL
}
rAdd = int64(int32(binary.LittleEndian.Uint32(state.sectdata[rsect][rOff:])))
case IMAGE_REL_I386_DIR32NB, IMAGE_REL_I386_DIR32:
if r.Type == IMAGE_REL_I386_DIR32NB {
rType = objabi.R_PEIMAGEOFF
} else {
case IMAGE_REL_I386_DIR32:
rType = objabi.R_ADDR
case IMAGE_REL_I386_DIR32NB:
rType = objabi.R_PEIMAGEOFF
}
// load addend from image
rAdd = int64(int32(binary.LittleEndian.Uint32(state.sectdata[rsect][rOff:])))
case IMAGE_REL_AMD64_ADDR64: // R_X86_64_64
case sys.AMD64:
switch r.Type {
case IMAGE_REL_AMD64_REL32:
rType = objabi.R_PCREL
case IMAGE_REL_AMD64_ADDR32:
rType = objabi.R_ADDR
case IMAGE_REL_AMD64_ADDR64:
rType = objabi.R_ADDR
rSize = 8
rType = objabi.R_ADDR
// load addend from image
rAdd = int64(binary.LittleEndian.Uint64(state.sectdata[rsect][rOff:]))
}
case sys.ARM:
switch r.Type {
default:
return nil, fmt.Errorf("%s: %v: unknown ARM relocation type %v", pn, state.sectsyms[rsect], r.Type)
case IMAGE_REL_ARM_SECREL:
rType = objabi.R_PCREL
rAdd = int64(int32(binary.LittleEndian.Uint32(state.sectdata[rsect][rOff:])))
case IMAGE_REL_ARM_ADDR32, IMAGE_REL_ARM_ADDR32NB:
if r.Type == IMAGE_REL_ARM_ADDR32NB {
case IMAGE_REL_AMD64_ADDR32NB:
rType = objabi.R_PEIMAGEOFF
} else {
rType = objabi.R_ADDR
}
rAdd = int64(int32(binary.LittleEndian.Uint32(state.sectdata[rsect][rOff:])))
case IMAGE_REL_ARM_BRANCH24:
rType = objabi.R_CALLARM
rAdd = int64(int32(binary.LittleEndian.Uint32(state.sectdata[rsect][rOff:])))
}
case sys.ARM64:
switch r.Type {
default:
return nil, fmt.Errorf("%s: %v: unknown ARM64 relocation type %v", pn, state.sectsyms[rsect], r.Type)
case IMAGE_REL_ARM64_ADDR32, IMAGE_REL_ARM64_ADDR32NB:
if r.Type == IMAGE_REL_ARM64_ADDR32NB {
rType = objabi.R_PEIMAGEOFF
} else {
case IMAGE_REL_ARM64_ADDR32:
rType = objabi.R_ADDR
case IMAGE_REL_ARM64_ADDR32NB:
rType = objabi.R_PEIMAGEOFF
}
}
if rType == 0 {
return nil, fmt.Errorf("%s: %v: unknown relocation type %v", pn, state.sectsyms[rsect], r.Type)
}
var rAdd int64
switch rSize {
default:
panic("unexpected relocation size " + strconv.Itoa(int(rSize)))
case 4:
rAdd = int64(int32(binary.LittleEndian.Uint32(state.sectdata[rsect][rOff:])))
case 8:
rAdd = int64(binary.LittleEndian.Uint64(state.sectdata[rsect][rOff:]))
}
}
// ld -r could generate multiple section symbols for the
// same section but with different values, we have to take
// that into account, or in the case of split resources,