forked from go-delve/delve
/
registers_linux_amd64.go
337 lines (311 loc) · 7.37 KB
/
registers_linux_amd64.go
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package native
import (
"fmt"
"golang.org/x/arch/x86/x86asm"
sys "golang.org/x/sys/unix"
"github.com/derekparker/delve/pkg/proc"
)
// Regs is a wrapper for sys.PtraceRegs.
type Regs struct {
regs *sys.PtraceRegs
fpregs []proc.Register
fpregset *proc.LinuxX86Xstate
}
func (r *Regs) Slice() []proc.Register {
var regs = []struct {
k string
v uint64
}{
{"Rip", r.regs.Rip},
{"Rsp", r.regs.Rsp},
{"Rax", r.regs.Rax},
{"Rbx", r.regs.Rbx},
{"Rcx", r.regs.Rcx},
{"Rdx", r.regs.Rdx},
{"Rdi", r.regs.Rdi},
{"Rsi", r.regs.Rsi},
{"Rbp", r.regs.Rbp},
{"R8", r.regs.R8},
{"R9", r.regs.R9},
{"R10", r.regs.R10},
{"R11", r.regs.R11},
{"R12", r.regs.R12},
{"R13", r.regs.R13},
{"R14", r.regs.R14},
{"R15", r.regs.R15},
{"Orig_rax", r.regs.Orig_rax},
{"Cs", r.regs.Cs},
{"Eflags", r.regs.Eflags},
{"Ss", r.regs.Ss},
{"Fs_base", r.regs.Fs_base},
{"Gs_base", r.regs.Gs_base},
{"Ds", r.regs.Ds},
{"Es", r.regs.Es},
{"Fs", r.regs.Fs},
{"Gs", r.regs.Gs},
}
out := make([]proc.Register, 0, len(regs)+len(r.fpregs))
for _, reg := range regs {
if reg.k == "Eflags" {
out = proc.AppendEflagReg(out, reg.k, reg.v)
} else {
out = proc.AppendQwordReg(out, reg.k, reg.v)
}
}
out = append(out, r.fpregs...)
return out
}
// PC returns the value of RIP register.
func (r *Regs) PC() uint64 {
return r.regs.PC()
}
// SP returns the value of RSP register.
func (r *Regs) SP() uint64 {
return r.regs.Rsp
}
func (r *Regs) BP() uint64 {
return r.regs.Rbp
}
// CX returns the value of RCX register.
func (r *Regs) CX() uint64 {
return r.regs.Rcx
}
// TLS returns the address of the thread
// local storage memory segment.
func (r *Regs) TLS() uint64 {
return r.regs.Fs_base
}
func (r *Regs) GAddr() (uint64, bool) {
return 0, false
}
// SetPC sets RIP to the value specified by 'pc'.
func (thread *Thread) SetPC(pc uint64) error {
ir, err := registers(thread, false)
if err != nil {
return err
}
r := ir.(*Regs)
r.regs.SetPC(pc)
thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, r.regs) })
return err
}
// SetSP sets RSP to the value specified by 'sp'
func (thread *Thread) SetSP(sp uint64) (err error) {
var ir proc.Registers
ir, err = registers(thread, false)
if err != nil {
return err
}
r := ir.(*Regs)
r.regs.Rsp = sp
thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, r.regs) })
return
}
func (thread *Thread) SetDX(dx uint64) (err error) {
var ir proc.Registers
ir, err = registers(thread, false)
if err != nil {
return err
}
r := ir.(*Regs)
r.regs.Rdx = dx
thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, r.regs) })
return
}
func (r *Regs) Get(n int) (uint64, error) {
reg := x86asm.Reg(n)
const (
mask8 = 0x000f
mask16 = 0x00ff
mask32 = 0xffff
)
switch reg {
// 8-bit
case x86asm.AL:
return r.regs.Rax & mask8, nil
case x86asm.CL:
return r.regs.Rcx & mask8, nil
case x86asm.DL:
return r.regs.Rdx & mask8, nil
case x86asm.BL:
return r.regs.Rbx & mask8, nil
case x86asm.AH:
return (r.regs.Rax >> 8) & mask8, nil
case x86asm.CH:
return (r.regs.Rcx >> 8) & mask8, nil
case x86asm.DH:
return (r.regs.Rdx >> 8) & mask8, nil
case x86asm.BH:
return (r.regs.Rbx >> 8) & mask8, nil
case x86asm.SPB:
return r.regs.Rsp & mask8, nil
case x86asm.BPB:
return r.regs.Rbp & mask8, nil
case x86asm.SIB:
return r.regs.Rsi & mask8, nil
case x86asm.DIB:
return r.regs.Rdi & mask8, nil
case x86asm.R8B:
return r.regs.R8 & mask8, nil
case x86asm.R9B:
return r.regs.R9 & mask8, nil
case x86asm.R10B:
return r.regs.R10 & mask8, nil
case x86asm.R11B:
return r.regs.R11 & mask8, nil
case x86asm.R12B:
return r.regs.R12 & mask8, nil
case x86asm.R13B:
return r.regs.R13 & mask8, nil
case x86asm.R14B:
return r.regs.R14 & mask8, nil
case x86asm.R15B:
return r.regs.R15 & mask8, nil
// 16-bit
case x86asm.AX:
return r.regs.Rax & mask16, nil
case x86asm.CX:
return r.regs.Rcx & mask16, nil
case x86asm.DX:
return r.regs.Rdx & mask16, nil
case x86asm.BX:
return r.regs.Rbx & mask16, nil
case x86asm.SP:
return r.regs.Rsp & mask16, nil
case x86asm.BP:
return r.regs.Rbp & mask16, nil
case x86asm.SI:
return r.regs.Rsi & mask16, nil
case x86asm.DI:
return r.regs.Rdi & mask16, nil
case x86asm.R8W:
return r.regs.R8 & mask16, nil
case x86asm.R9W:
return r.regs.R9 & mask16, nil
case x86asm.R10W:
return r.regs.R10 & mask16, nil
case x86asm.R11W:
return r.regs.R11 & mask16, nil
case x86asm.R12W:
return r.regs.R12 & mask16, nil
case x86asm.R13W:
return r.regs.R13 & mask16, nil
case x86asm.R14W:
return r.regs.R14 & mask16, nil
case x86asm.R15W:
return r.regs.R15 & mask16, nil
// 32-bit
case x86asm.EAX:
return r.regs.Rax & mask32, nil
case x86asm.ECX:
return r.regs.Rcx & mask32, nil
case x86asm.EDX:
return r.regs.Rdx & mask32, nil
case x86asm.EBX:
return r.regs.Rbx & mask32, nil
case x86asm.ESP:
return r.regs.Rsp & mask32, nil
case x86asm.EBP:
return r.regs.Rbp & mask32, nil
case x86asm.ESI:
return r.regs.Rsi & mask32, nil
case x86asm.EDI:
return r.regs.Rdi & mask32, nil
case x86asm.R8L:
return r.regs.R8 & mask32, nil
case x86asm.R9L:
return r.regs.R9 & mask32, nil
case x86asm.R10L:
return r.regs.R10 & mask32, nil
case x86asm.R11L:
return r.regs.R11 & mask32, nil
case x86asm.R12L:
return r.regs.R12 & mask32, nil
case x86asm.R13L:
return r.regs.R13 & mask32, nil
case x86asm.R14L:
return r.regs.R14 & mask32, nil
case x86asm.R15L:
return r.regs.R15 & mask32, nil
// 64-bit
case x86asm.RAX:
return r.regs.Rax, nil
case x86asm.RCX:
return r.regs.Rcx, nil
case x86asm.RDX:
return r.regs.Rdx, nil
case x86asm.RBX:
return r.regs.Rbx, nil
case x86asm.RSP:
return r.regs.Rsp, nil
case x86asm.RBP:
return r.regs.Rbp, nil
case x86asm.RSI:
return r.regs.Rsi, nil
case x86asm.RDI:
return r.regs.Rdi, nil
case x86asm.R8:
return r.regs.R8, nil
case x86asm.R9:
return r.regs.R9, nil
case x86asm.R10:
return r.regs.R10, nil
case x86asm.R11:
return r.regs.R11, nil
case x86asm.R12:
return r.regs.R12, nil
case x86asm.R13:
return r.regs.R13, nil
case x86asm.R14:
return r.regs.R14, nil
case x86asm.R15:
return r.regs.R15, nil
}
return 0, proc.UnknownRegisterError
}
func registers(thread *Thread, floatingPoint bool) (proc.Registers, error) {
var (
regs sys.PtraceRegs
err error
)
thread.dbp.execPtraceFunc(func() { err = sys.PtraceGetRegs(thread.ID, ®s) })
if err != nil {
return nil, err
}
r := &Regs{®s, nil, nil}
if floatingPoint {
var fpregset proc.LinuxX86Xstate
r.fpregs, fpregset, err = thread.fpRegisters()
r.fpregset = &fpregset
if err != nil {
return nil, err
}
}
return r, nil
}
const (
_X86_XSTATE_MAX_SIZE = 2688
_NT_X86_XSTATE = 0x202
_XSAVE_HEADER_START = 512
_XSAVE_HEADER_LEN = 64
_XSAVE_EXTENDED_REGION_START = 576
_XSAVE_SSE_REGION_LEN = 416
)
func (thread *Thread) fpRegisters() (regs []proc.Register, fpregs proc.LinuxX86Xstate, err error) {
thread.dbp.execPtraceFunc(func() { fpregs, err = PtraceGetRegset(thread.ID) })
regs = fpregs.Decode()
if err != nil {
err = fmt.Errorf("could not get floating point registers: %v", err.Error())
}
return
}
type savedRegisters struct {
regs sys.PtraceRegs
fpregs proc.LinuxX86Xstate
}
func (r *Regs) Save() proc.SavedRegisters {
savedRegs := &savedRegisters{}
savedRegs.regs = *r.regs
savedRegs.fpregs = *r.fpregset
return savedRegs
}