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runtime: pass windows float syscall args via XMM

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Based on the calling convention documented in:

	https://msdn.microsoft.com/en-us/library/zthk2dkh.aspx

and long-used in golang.org/x/mobile/gl via some fixup asm:

	https://go.googlesource.com/mobile/+/master/gl/work_windows_amd64.s

Fixes #6510

Change-Id: I97e81baaa2872bcd732b1308915eb66f1ba2168f
Reviewed-on: https://go-review.googlesource.com/32173
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Minux Ma <minux@golang.org>
This commit is contained in:
David Crawshaw 2016-10-26 13:29:39 -04:00
parent dd500193d3
commit 9c02c75639
2 changed files with 64 additions and 0 deletions
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8
src/runtime/sys_windows_amd64.s
View File

@ -45,6 +45,14 @@ loadregs:
MOVQ 8(SI), DX
MOVQ 16(SI), R8
MOVQ 24(SI), R9
// Floating point arguments are passed in the XMM
// registers. Set them here in case any of the arguments
// are floating point values. For details see
// https://msdn.microsoft.com/en-us/library/zthk2dkh.aspx
MOVQ CX, X0
MOVQ DX, X1
MOVQ R8, X2
MOVQ R9, X3
// Call stdcall function.
CALL AX

56
src/runtime/syscall_windows_test.go
View File

@ -10,6 +10,7 @@ import (
"internal/syscall/windows/sysdll"
"internal/testenv"
"io/ioutil"
"math"
"os"
"os/exec"
"path/filepath"
@ -622,6 +623,61 @@ uintptr_t cfunc(callback f, uintptr_t n) {
}
}
func TestFloatArgs(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>
uintptr_t cfunc(uintptr_t a, double b, float c, double d) {
if (a == 1 && b == 2.2 && c == 3.3f && d == 4.4e44) {
return 1;
}
return 0;
}
`
tmpdir, err := ioutil.TempDir("", "TestFloatArgs")
if err != nil {
t.Fatal("TempDir failed: ", err)
}
defer os.RemoveAll(tmpdir)
srcname := "mydll.c"
err = ioutil.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")
r, _, err := proc.Call(
1,
uintptr(math.Float64bits(2.2)),
uintptr(math.Float32bits(3.3)),
uintptr(math.Float64bits(4.4e44)),
)
if r != 1 {
t.Errorf("got %d want 1 (err=%v)", r, err)
}
}
func TestTimeBeginPeriod(t *testing.T) {
const TIMERR_NOERROR = 0
if *runtime.TimeBeginPeriodRetValue != TIMERR_NOERROR {