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runtime: increase maxargs to avoid syscall18 crash when called with more than 16 args

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Fixes #45524

Change-Id: Id867f45ea98689b73d5b1b141c19317bc7608b05
GitHub-Last-Rev: e9b09fb557
GitHub-Pull-Request: golang/go#45531
Reviewed-on: https://go-review.googlesource.com/c/go/+/309390
Reviewed-by: El Mostafa Idrassi <el.mostafa.idrassi@gmail.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
El Mostafa Idrassi 2021-04-13 20:08:46 +00:00 committed by Alex Brainman
parent 58fdac04e4
commit ab02cbd29f
2 changed files with 46 additions and 1 deletions
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2
src/runtime/sys_windows_amd64.s
View File

@ -8,7 +8,7 @@
// maxargs should be divisible by 2, as Windows stack
// must be kept 16-byte aligned on syscall entry.
#define maxargs 16
#define maxargs 18
// void runtime·asmstdcall(void *c);
TEXT runtime·asmstdcall<ABIInternal>(SB),NOSPLIT|NOFRAME,$0

45
src/runtime/syscall_windows_test.go
View File

@ -744,6 +744,51 @@ uintptr_t cfunc(callback f, uintptr_t n) {
}
}
func TestSyscall18(t *testing.T) {
if _, err := exec.LookPath("gcc"); err != nil {
t.Skip("skipping test: gcc is missing")
}
if runtime.GOARCH != "amd64" {
t.Skipf("skipping test: GOARCH=%s", runtime.GOARCH)
}
const src = `
#include <stdint.h>
#include <windows.h>
int cfunc( int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8, int a9,
int a10, int a11, int a12, int a13, int a14, int a15, int a16, int a17, int a18) {
return 1;
}
`
tmpdir := t.TempDir()
srcname := "mydll.c"
err := os.WriteFile(filepath.Join(tmpdir, srcname), []byte(src), 0)
if err != nil {
t.Fatal(err)
}
outname := "mydll.dll"
cmd := exec.Command("gcc", "-shared", "-s", "-Werror", "-o", outname, srcname)
cmd.Dir = tmpdir
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("failed to build dll: %v - %v", err, string(out))
}
dllpath := filepath.Join(tmpdir, outname)
dll := syscall.MustLoadDLL(dllpath)
defer dll.Release()
proc := dll.MustFindProc("cfunc")
// proc.Call() will call Syscall18() internally.
r, _, err := proc.Call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
if r != 1 {
t.Errorf("got %d want 1 (err=%v)", r, err)
}
}
func TestFloatArgs(t *testing.T) {
if _, err := exec.LookPath("gcc"); err != nil {
t.Skip("skipping test: gcc is missing")