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cmd/link: set .ctors COFF section to writable and aligned

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Without setting these flags, LLVM's LLD ignores the .ctors section when
merging objects.

Updates #44250.
Updates #39326.
Updates #38755.
Updates #36439.
Updates #43800.

Change-Id: I8766104508f7acd832088a590ee7d68afa0d6065
Reviewed-on: https://go-review.googlesource.com/c/go/+/291633
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
Jason A. Donenfeld 2021-02-14 19:01:39 +01:00
parent 811167e2c9
commit 91cfbf39e4
1 changed files with 8 additions and 7 deletions
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15
src/cmd/link/internal/ld/pe.go
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@ -66,6 +66,8 @@ const (
IMAGE_SCN_MEM_WRITE = 0x80000000
IMAGE_SCN_MEM_DISCARDABLE = 0x2000000
IMAGE_SCN_LNK_NRELOC_OVFL = 0x1000000
IMAGE_SCN_ALIGN_4BYTES = 0x300000
IMAGE_SCN_ALIGN_8BYTES = 0x400000
IMAGE_SCN_ALIGN_32BYTES = 0x600000
)
@ -478,20 +480,19 @@ func (f *peFile) addInitArray(ctxt *Link) *peSection {
// However, the entire Go runtime is initialized from just one function, so it is unlikely
// that this will need to grow in the future.
var size int
var alignment uint32
switch objabi.GOARCH {
default:
Exitf("peFile.addInitArray: unsupported GOARCH=%q\n", objabi.GOARCH)
case "386":
case "386", "arm":
size = 4
case "amd64":
size = 8
case "arm":
size = 4
case "arm64":
alignment = IMAGE_SCN_ALIGN_4BYTES
case "amd64", "arm64":
size = 8
alignment = IMAGE_SCN_ALIGN_8BYTES
}
sect := f.addSection(".ctors", size, size)
sect.characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ
sect.characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE | alignment
sect.sizeOfRawData = uint32(size)
ctxt.Out.SeekSet(int64(sect.pointerToRawData))
sect.checkOffset(ctxt.Out.Offset())