Imported Upstream version 1.4upstream/1.4

1 files changed, 206 insertions, 0 deletions

diff --git a/src/cmd/internal/rsc.io/x86/x86asm/xedext_test.go b/src/cmd/internal/rsc.io/x86/x86asm/xedext_test.go
new file mode 100644
index 000000000..d7aa8e3e2
--- /dev/null
+++ b/src/cmd/internal/rsc.io/x86/x86asm/xedext_test.go
@@ -0,0 +1,206 @@
+package x86asm
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+// xed binary from Intel sde-external-6.22.0-2014-03-06.
+const xedPath = "/Users/rsc/bin/xed"
+
+func testXedArch(t *testing.T, arch int, generate func(func([]byte))) {
+	if testing.Short() {
+		t.Skip("skipping libmach test in short mode")
+	}
+
+	if _, err := os.Stat(xedPath); err != nil {
+		t.Fatal(err)
+	}
+
+	testExtDis(t, "intel", arch, xed, generate, allowedMismatchXed)
+}
+
+func testXed32(t *testing.T, generate func(func([]byte))) {
+	testXedArch(t, 32, generate)
+}
+
+func testXed64(t *testing.T, generate func(func([]byte))) {
+	testXedArch(t, 64, generate)
+}
+
+func xed(ext *ExtDis) error {
+	b, err := ext.Run(xedPath, fmt.Sprintf("-%d", ext.Arch), "-n", "1G", "-ir", ext.File.Name())
+	if err != nil {
+		return err
+	}
+
+	nmatch := 0
+	next := uint32(start)
+	var (
+		addr   uint32
+		encbuf [32]byte
+		enc    []byte
+		text   string
+	)
+
+	var xedEnd = []byte("# end of text section")
+	var xedEnd1 = []byte("# Errors")
+
+	eof := false
+	for {
+		line, err := b.ReadSlice('\n')
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return fmt.Errorf("reading objdump output: %v", err)
+		}
+		if debug {
+			os.Stdout.Write(line)
+		}
+		if bytes.HasPrefix(line, xedEnd) || bytes.HasPrefix(line, xedEnd1) {
+			eof = true
+		}
+		if eof {
+			continue
+		}
+		nmatch++
+		addr, enc, text = parseLineXed(line, encbuf[:0])
+		if addr > next {
+			return fmt.Errorf("address out of sync expected <= %#x at %q in:\n%s", next, line, line)
+		}
+		if addr < next {
+			continue
+		}
+		switch text {
+		case "repz":
+			text = "rep"
+		case "repnz":
+			text = "repn"
+		default:
+			text = strings.Replace(text, "repz ", "rep ", -1)
+			text = strings.Replace(text, "repnz ", "repn ", -1)
+		}
+		if m := pcrelw.FindStringSubmatch(text); m != nil {
+			targ, _ := strconv.ParseUint(m[2], 16, 64)
+			text = fmt.Sprintf("%s .%+#x", m[1], int16(uint32(targ)-uint32(uint16(addr))-uint32(len(enc))))
+		}
+		if m := pcrel.FindStringSubmatch(text); m != nil {
+			targ, _ := strconv.ParseUint(m[2], 16, 64)
+			text = fmt.Sprintf("%s .%+#x", m[1], int32(uint32(targ)-addr-uint32(len(enc))))
+		}
+		ext.Dec <- ExtInst{addr, encbuf, len(enc), text}
+		encbuf = [32]byte{}
+		enc = nil
+		next += 32
+	}
+	if next != start+uint32(ext.Size) {
+		return fmt.Errorf("not enough results found [%d %d]", next, start+ext.Size)
+	}
+	if err := ext.Wait(); err != nil {
+		return fmt.Errorf("exec: %v", err)
+	}
+
+	return nil
+}
+
+var (
+	xedInRaw    = []byte("In raw...")
+	xedDots     = []byte("...")
+	xdis        = []byte("XDIS ")
+	xedError    = []byte("ERROR: ")
+	xedNoDecode = []byte("Could not decode at offset: 0x")
+)
+
+func parseLineXed(line []byte, encstart []byte) (addr uint32, enc []byte, text string) {
+	oline := line
+	if bytes.HasPrefix(line, xedInRaw) || bytes.HasPrefix(line, xedDots) {
+		return 0, nil, ""
+	}
+	if bytes.HasPrefix(line, xedError) {
+		i := bytes.IndexByte(line[len(xedError):], ' ')
+		if i < 0 {
+			log.Fatalf("cannot parse error: %q", oline)
+		}
+		errstr := string(line[len(xedError):])
+		i = bytes.Index(line, xedNoDecode)
+		if i < 0 {
+			log.Fatalf("cannot parse error: %q", oline)
+		}
+		i += len(xedNoDecode)
+		j := bytes.IndexByte(line[i:], ' ')
+		if j < 0 {
+			log.Fatalf("cannot parse error: %q", oline)
+		}
+		x, err := strconv.ParseUint(string(trimSpace(line[i:i+j])), 16, 32)
+		if err != nil {
+			log.Fatalf("cannot parse disassembly: %q", oline)
+		}
+		addr = uint32(x)
+		return addr, nil, errstr
+	}
+
+	if !bytes.HasPrefix(line, xdis) {
+		log.Fatalf("cannot parse disassembly: %q", oline)
+	}
+
+	i := bytes.IndexByte(line, ':')
+	if i < 0 {
+		log.Fatalf("cannot parse disassembly: %q", oline)
+	}
+	x, err := strconv.ParseUint(string(trimSpace(line[len(xdis):i])), 16, 32)
+	if err != nil {
+		log.Fatalf("cannot parse disassembly: %q", oline)
+	}
+	addr = uint32(x)
+
+	// spaces
+	i++
+	for i < len(line) && line[i] == ' ' {
+		i++
+	}
+	// instruction class, spaces
+	for i < len(line) && line[i] != ' ' {
+		i++
+	}
+	for i < len(line) && line[i] == ' ' {
+		i++
+	}
+	// instruction set, spaces
+	for i < len(line) && line[i] != ' ' {
+		i++
+	}
+	for i < len(line) && line[i] == ' ' {
+		i++
+	}
+
+	// hex
+	hexStart := i
+	for i < len(line) && line[i] != ' ' {
+		i++
+	}
+	hexEnd := i
+	for i < len(line) && line[i] == ' ' {
+		i++
+	}
+
+	// text
+	textStart := i
+	for i < len(line) && line[i] != '\n' {
+		i++
+	}
+	textEnd := i
+
+	enc, ok := parseHex(line[hexStart:hexEnd], encstart)
+	if !ok {
+		log.Fatalf("cannot parse disassembly: %q", oline)
+	}
+
+	return addr, enc, string(fixSpace(line[textStart:textEnd]))
+}