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cmd/link: introduce and use peFile.addInitArray

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Change-Id: I4377c478159129ab3f3b5ddc58d1944f8f4a4b07
Reviewed-on: https://go-review.googlesource.com/56320
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Alex Brainman 2017-06-05 16:56:33 +10:00
parent 7188e00287
commit 7f7be843e9
1 changed files with 34 additions and 38 deletions
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72
src/cmd/link/internal/ld/pe.go
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@ -10,7 +10,6 @@ import (
"debug/pe"
"encoding/binary"
"fmt"
"os"
"sort"
"strconv"
"strings"
@ -490,6 +489,39 @@ func (f *peFile) addDWARFSection(name string, size int) *peSection {
return h
}
// addInitArray adds .ctors COFF section to the file f.
func (f *peFile) addInitArray(ctxt *Link) *peSection {
// The size below was determined by the specification for array relocations,
// and by observing what GCC writes here. If the initarray section grows to
// contain more than one constructor entry, the size will need to be 8 * constructor_count.
// 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
switch objabi.GOARCH {
default:
Exitf("peFile.addInitArray: unsupported GOARCH=%q\n", objabi.GOARCH)
case "386":
size = 4
case "amd64":
size = 8
}
sect := f.addSection(".ctors", size, size)
sect.Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ
sect.SizeOfRawData = uint32(size)
Cseek(int64(sect.PointerToRawData))
sect.checkOffset(coutbuf.Offset())
init_entry := ctxt.Syms.Lookup(*flagEntrySymbol, 0)
addr := uint64(init_entry.Value) - init_entry.Sect.Vaddr
switch objabi.GOARCH {
case "386":
Lputl(uint32(addr))
case "amd64":
Vputl(addr)
}
return sect
}
var pefile peFile
func Peinit(ctxt *Link) {
@ -1170,42 +1202,6 @@ func addpersrc(ctxt *Link) {
dd[IMAGE_DIRECTORY_ENTRY_RESOURCE].Size = h.VirtualSize
}
func addinitarray(ctxt *Link) (c *peSection) {
// The size below was determined by the specification for array relocations,
// and by observing what GCC writes here. If the initarray section grows to
// contain more than one constructor entry, the size will need to be 8 * constructor_count.
// 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
switch objabi.GOARCH {
default:
fmt.Fprintf(os.Stderr, "link: unknown architecture for PE: %q\n", objabi.GOARCH)
os.Exit(2)
case "386":
size = 4
case "amd64":
size = 8
}
c = pefile.addSection(".ctors", size, size)
c.Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ
c.SizeOfRawData = uint32(size)
Cseek(int64(c.PointerToRawData))
c.checkOffset(coutbuf.Offset())
init_entry := ctxt.Syms.Lookup(*flagEntrySymbol, 0)
addr := uint64(init_entry.Value) - init_entry.Sect.Vaddr
switch objabi.GOARCH {
case "386":
Lputl(uint32(addr))
case "amd64":
Vputl(addr)
}
return c
}
func Asmbpe(ctxt *Link) {
switch SysArch.Family {
default:
@ -1250,7 +1246,7 @@ func Asmbpe(ctxt *Link) {
}
if Linkmode == LinkExternal {
c = addinitarray(ctxt)
c = pefile.addInitArray(ctxt)
}
Cseek(int64(pefile.nextFileOffset))