b9d0ddd82c
A significant amount of time is spent generating the string representation for the proc.Registers object of each thread, since this field is rarely used (only when the Registers API is called) it should be generated on demand. Also by changing the internal representation of proc.Register to be closer to that of op.DwarfRegister it will help us implement #1838 (when Delve will need to be able to display the registers of an internal frame, which we currently represent using op.DwarfRegister objects). Benchmark before: BenchmarkConditionalBreakpoints-4 1 22292554301 ns/op Benchmark after: BenchmarkConditionalBreakpoints-4 1 17326345671 ns/op Reduces conditional breakpoint latency from 2.2ms to 1.7ms. Updates #1549, #1838
329 lines
8.1 KiB
Go
329 lines
8.1 KiB
Go
package fbsdutil
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import (
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"golang.org/x/arch/x86/x86asm"
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"github.com/go-delve/delve/pkg/proc"
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"github.com/go-delve/delve/pkg/proc/linutil"
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)
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// AMD64Registers implements the proc.Registers interface for the native/freebsd
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// backend and core/freebsd backends, on AMD64.
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type AMD64Registers struct {
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Regs *AMD64PtraceRegs
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Fpregs []proc.Register
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Fpregset *AMD64Xstate
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Fsbase uint64
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}
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// AMD64PtraceRegs is the struct used by the freebsd kernel to return the
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// general purpose registers for AMD64 CPUs.
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// source: sys/x86/include/reg.h
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type AMD64PtraceRegs struct {
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R15 int64
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R14 int64
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R13 int64
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R12 int64
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R11 int64
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R10 int64
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R9 int64
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R8 int64
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Rdi int64
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Rsi int64
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Rbp int64
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Rbx int64
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Rdx int64
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Rcx int64
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Rax int64
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Trapno uint32
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Fs uint16
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Gs uint16
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Err uint32
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Es uint16
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Ds uint16
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Rip int64
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Cs int64
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Rflags int64
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Rsp int64
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Ss int64
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}
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// Slice returns the registers as a list of (name, value) pairs.
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func (r *AMD64Registers) Slice(floatingPoint bool) []proc.Register {
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var regs64 = []struct {
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k string
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v int64
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}{
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{"R15", r.Regs.R15},
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{"R14", r.Regs.R14},
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{"R13", r.Regs.R13},
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{"R12", r.Regs.R12},
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{"R11", r.Regs.R11},
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{"R10", r.Regs.R10},
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{"R9", r.Regs.R9},
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{"R8", r.Regs.R8},
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{"Rdi", r.Regs.Rdi},
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{"Rsi", r.Regs.Rsi},
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{"Rbp", r.Regs.Rbp},
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{"Rbx", r.Regs.Rbx},
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{"Rdx", r.Regs.Rdx},
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{"Rcx", r.Regs.Rcx},
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{"Rax", r.Regs.Rax},
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{"Rip", r.Regs.Rip},
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{"Cs", r.Regs.Cs},
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{"Rflags", r.Regs.Rflags},
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{"Rsp", r.Regs.Rsp},
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{"Ss", r.Regs.Ss},
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}
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var regs32 = []struct {
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k string
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v uint32
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}{
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{"Trapno", r.Regs.Trapno},
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{"Err", r.Regs.Err},
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}
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var regs16 = []struct {
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k string
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v uint16
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}{
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{"Fs", r.Regs.Fs},
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{"Gs", r.Regs.Gs},
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{"Es", r.Regs.Es},
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{"Ds", r.Regs.Ds},
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}
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out := make([]proc.Register, 0,
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len(regs64)+
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len(regs32)+
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len(regs16)+
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1+ // for Rflags
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len(r.Fpregs))
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for _, reg := range regs64 {
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// FreeBSD defines the registers as signed, but Linux defines
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// them as unsigned. Of course, a register doesn't really have
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// a concept of signedness. Cast to what Delve expects.
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out = proc.AppendUint64Register(out, reg.k, uint64(reg.v))
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}
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for _, reg := range regs32 {
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out = proc.AppendUint64Register(out, reg.k, uint64(reg.v))
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}
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for _, reg := range regs16 {
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out = proc.AppendUint64Register(out, reg.k, uint64(reg.v))
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}
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// x86 called this register "Eflags". amd64 extended it and renamed it
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// "Rflags", but Linux still uses the old name.
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out = proc.AppendUint64Register(out, "Rflags", uint64(r.Regs.Rflags))
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if floatingPoint {
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out = append(out, r.Fpregs...)
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}
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return out
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}
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// PC returns the value of RIP register.
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func (r *AMD64Registers) PC() uint64 {
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return uint64(r.Regs.Rip)
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}
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// SP returns the value of RSP register.
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func (r *AMD64Registers) SP() uint64 {
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return uint64(r.Regs.Rsp)
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}
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func (r *AMD64Registers) BP() uint64 {
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return uint64(r.Regs.Rbp)
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}
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// TLS returns the address of the thread local storage memory segment.
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func (r *AMD64Registers) TLS() uint64 {
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return r.Fsbase
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}
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// GAddr returns the address of the G variable if it is known, 0 and false
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// otherwise.
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func (r *AMD64Registers) GAddr() (uint64, bool) {
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return 0, false
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}
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// Get returns the value of the n-th register (in x86asm order).
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func (r *AMD64Registers) Get(n int) (uint64, error) {
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reg := x86asm.Reg(n)
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const (
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mask8 = 0x000000ff
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mask16 = 0x0000ffff
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mask32 = 0xffffffff
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)
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switch reg {
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// 8-bit
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case x86asm.AL:
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return uint64(r.Regs.Rax) & mask8, nil
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case x86asm.CL:
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return uint64(r.Regs.Rcx) & mask8, nil
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case x86asm.DL:
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return uint64(r.Regs.Rdx) & mask8, nil
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case x86asm.BL:
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return uint64(r.Regs.Rbx) & mask8, nil
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case x86asm.AH:
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return (uint64(r.Regs.Rax) >> 8) & mask8, nil
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case x86asm.CH:
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return (uint64(r.Regs.Rcx) >> 8) & mask8, nil
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case x86asm.DH:
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return (uint64(r.Regs.Rdx) >> 8) & mask8, nil
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case x86asm.BH:
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return (uint64(r.Regs.Rbx) >> 8) & mask8, nil
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case x86asm.SPB:
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return uint64(r.Regs.Rsp) & mask8, nil
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case x86asm.BPB:
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return uint64(r.Regs.Rbp) & mask8, nil
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case x86asm.SIB:
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return uint64(r.Regs.Rsi) & mask8, nil
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case x86asm.DIB:
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return uint64(r.Regs.Rdi) & mask8, nil
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case x86asm.R8B:
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return uint64(r.Regs.R8) & mask8, nil
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case x86asm.R9B:
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return uint64(r.Regs.R9) & mask8, nil
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case x86asm.R10B:
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return uint64(r.Regs.R10) & mask8, nil
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case x86asm.R11B:
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return uint64(r.Regs.R11) & mask8, nil
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case x86asm.R12B:
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return uint64(r.Regs.R12) & mask8, nil
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case x86asm.R13B:
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return uint64(r.Regs.R13) & mask8, nil
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case x86asm.R14B:
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return uint64(r.Regs.R14) & mask8, nil
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case x86asm.R15B:
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return uint64(r.Regs.R15) & mask8, nil
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// 16-bit
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case x86asm.AX:
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return uint64(r.Regs.Rax) & mask16, nil
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case x86asm.CX:
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return uint64(r.Regs.Rcx) & mask16, nil
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case x86asm.DX:
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return uint64(r.Regs.Rdx) & mask16, nil
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case x86asm.BX:
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return uint64(r.Regs.Rbx) & mask16, nil
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case x86asm.SP:
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return uint64(r.Regs.Rsp) & mask16, nil
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case x86asm.BP:
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return uint64(r.Regs.Rbp) & mask16, nil
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case x86asm.SI:
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return uint64(r.Regs.Rsi) & mask16, nil
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case x86asm.DI:
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return uint64(r.Regs.Rdi) & mask16, nil
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case x86asm.R8W:
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return uint64(r.Regs.R8) & mask16, nil
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case x86asm.R9W:
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return uint64(r.Regs.R9) & mask16, nil
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case x86asm.R10W:
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return uint64(r.Regs.R10) & mask16, nil
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case x86asm.R11W:
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return uint64(r.Regs.R11) & mask16, nil
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case x86asm.R12W:
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return uint64(r.Regs.R12) & mask16, nil
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case x86asm.R13W:
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return uint64(r.Regs.R13) & mask16, nil
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case x86asm.R14W:
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return uint64(r.Regs.R14) & mask16, nil
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case x86asm.R15W:
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return uint64(r.Regs.R15) & mask16, nil
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// 32-bit
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case x86asm.EAX:
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return uint64(r.Regs.Rax) & mask32, nil
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case x86asm.ECX:
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return uint64(r.Regs.Rcx) & mask32, nil
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case x86asm.EDX:
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return uint64(r.Regs.Rdx) & mask32, nil
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case x86asm.EBX:
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return uint64(r.Regs.Rbx) & mask32, nil
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case x86asm.ESP:
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return uint64(r.Regs.Rsp) & mask32, nil
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case x86asm.EBP:
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return uint64(r.Regs.Rbp) & mask32, nil
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case x86asm.ESI:
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return uint64(r.Regs.Rsi) & mask32, nil
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case x86asm.EDI:
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return uint64(r.Regs.Rdi) & mask32, nil
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case x86asm.R8L:
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return uint64(r.Regs.R8) & mask32, nil
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case x86asm.R9L:
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return uint64(r.Regs.R9) & mask32, nil
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case x86asm.R10L:
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return uint64(r.Regs.R10) & mask32, nil
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case x86asm.R11L:
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return uint64(r.Regs.R11) & mask32, nil
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case x86asm.R12L:
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return uint64(r.Regs.R12) & mask32, nil
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case x86asm.R13L:
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return uint64(r.Regs.R13) & mask32, nil
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case x86asm.R14L:
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return uint64(r.Regs.R14) & mask32, nil
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case x86asm.R15L:
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return uint64(r.Regs.R15) & mask32, nil
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// 64-bit
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case x86asm.RAX:
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return uint64(r.Regs.Rax), nil
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case x86asm.RCX:
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return uint64(r.Regs.Rcx), nil
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case x86asm.RDX:
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return uint64(r.Regs.Rdx), nil
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case x86asm.RBX:
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return uint64(r.Regs.Rbx), nil
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case x86asm.RSP:
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return uint64(r.Regs.Rsp), nil
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case x86asm.RBP:
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return uint64(r.Regs.Rbp), nil
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case x86asm.RSI:
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return uint64(r.Regs.Rsi), nil
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case x86asm.RDI:
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return uint64(r.Regs.Rdi), nil
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case x86asm.R8:
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return uint64(r.Regs.R8), nil
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case x86asm.R9:
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return uint64(r.Regs.R9), nil
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case x86asm.R10:
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return uint64(r.Regs.R10), nil
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case x86asm.R11:
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return uint64(r.Regs.R11), nil
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case x86asm.R12:
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return uint64(r.Regs.R12), nil
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case x86asm.R13:
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return uint64(r.Regs.R13), nil
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case x86asm.R14:
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return uint64(r.Regs.R14), nil
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case x86asm.R15:
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return uint64(r.Regs.R15), nil
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}
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return 0, proc.ErrUnknownRegister
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}
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// Copy returns a copy of these registers that is guarenteed not to change.
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func (r *AMD64Registers) Copy() proc.Registers {
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var rr AMD64Registers
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rr.Regs = &AMD64PtraceRegs{}
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rr.Fpregset = &AMD64Xstate{}
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*(rr.Regs) = *(r.Regs)
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if r.Fpregset != nil {
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*(rr.Fpregset) = *(r.Fpregset)
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}
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if r.Fpregs != nil {
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rr.Fpregs = make([]proc.Register, len(r.Fpregs))
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copy(rr.Fpregs, r.Fpregs)
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}
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return &rr
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}
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type AMD64Xstate linutil.AMD64Xstate
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func AMD64XstateRead(xstateargs []byte, readLegacy bool, regset *AMD64Xstate) error {
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return linutil.AMD64XstateRead(xstateargs, readLegacy, (*linutil.AMD64Xstate)(regset))
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}
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func (xsave *AMD64Xstate) Decode() (regs []proc.Register) {
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return (*linutil.AMD64Xstate).Decode((*linutil.AMD64Xstate)(xsave))
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}
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