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Debugger architecture interface and definitions for AMD64.

R=rsc
APPROVED=rsc
DELTA=114  (114 added, 0 deleted, 0 changed)
OCL=33957
CL=33962
This commit is contained in:
Austin Clements 2009-08-27 11:24:13 -07:00
parent c0dd9f526b
commit ea62b3441f

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usr/austin/ogle/arch.go Normal file
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ogle
import (
"math";
"ptrace";
)
type Arch interface {
// ToWord converts an array of up to 8 bytes in memory order
// to a word.
ToWord(data []byte) ptrace.Word;
// FromWord converts a word to an array of up to 8 bytes in
// memory order.
FromWord(v ptrace.Word, out []byte);
// ToFloat32 converts a word to a float. The order of this
// word will be the order returned by ToWord on the memory
// representation of a float, and thus may require reversing.
ToFloat32(bits uint32) float32;
// FromFloat32 converts a float to a word. This should return
// a word that can be passed to FromWord to get the memory
// representation of a float on this architecture.
FromFloat32(f float32) uint32;
// ToFloat64 is to float64 as ToFloat32 is to float32.
ToFloat64(bits uint64) float64;
// FromFloat64 is to float64 as FromFloat32 is to float32.
FromFloat64(f float64) uint64;
// IntSize returns the number of bytes in an 'int'.
IntSize() int;
// PtrSize returns the number of bytes in a 'uintptr'.
PtrSize() int;
// FloatSize returns the number of bytes in a 'float'.
FloatSize() int;
// Align rounds offset up to the appropriate offset for a
// basic type with the given width.
Align(offset, width int) int;
// G returns the current G pointer.
G(regs ptrace.Regs) ptrace.Word;
}
type ArchLSB struct {}
func (ArchLSB) ToWord(data []byte) ptrace.Word {
var v ptrace.Word;
for i, b := range data {
v |= ptrace.Word(b) << (uint(i)*8);
}
return v;
}
func (ArchLSB) FromWord(v ptrace.Word, out []byte) {
for i := range out {
out[i] = byte(v);
v >>= 8;
}
}
func (ArchLSB) ToFloat32(bits uint32) float32 {
// TODO(austin) Do these definitions depend on my current
// architecture?
return math.Float32frombits(bits);
}
func (ArchLSB) FromFloat32(f float32) uint32 {
return math.Float32bits(f);
}
func (ArchLSB) ToFloat64(bits uint64) float64 {
return math.Float64frombits(bits);
}
func (ArchLSB) FromFloat64(f float64) uint64 {
return math.Float64bits(f);
}
type ArchAlignedMultiple struct {}
func (ArchAlignedMultiple) Align(offset, width int) int {
return ((offset - 1) | (width - 1)) + 1;
}
type amd64 struct {
ArchLSB;
ArchAlignedMultiple;
gReg int;
}
func (a *amd64) IntSize() int {
return 4;
}
func (a *amd64) PtrSize() int {
return 8;
}
func (a *amd64) FloatSize() int {
return 4;
}
func (a *amd64) G(regs ptrace.Regs) ptrace.Word {
// See src/pkg/runtime/mkasmh
if a.gReg == -1 {
ns := regs.Names();
for i, n := range ns {
if n == "r15" {
a.gReg = i;
break;
}
}
}
return regs.Get(a.gReg);
}
var Amd64 = &amd64{gReg: -1};