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