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proc/native: separate amd64-arch code
As proc/native is arch related, it should move some functions to arch-relate file. And this patch can help us to separate the architecture code, make code tidy. So that the merge of arm64 code later will not cause chaos.(go-delve#118)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| package native | ||
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| import ( | ||
| "syscall" | ||
| "unsafe" | ||
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| sys "golang.org/x/sys/unix" | ||
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| "github.com/go-delve/delve/pkg/proc/linutil" | ||
| ) | ||
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| // PtraceGetRegset returns floating point registers of the specified thread | ||
| // using PTRACE. | ||
| // See amd64_linux_fetch_inferior_registers in gdb/amd64-linux-nat.c.html | ||
| // and amd64_supply_xsave in gdb/amd64-tdep.c.html | ||
| // and Section 13.1 (and following) of Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1: Basic Architecture | ||
| func PtraceGetRegset(tid int) (regset linutil.AMD64Xstate, err error) { | ||
| _, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETFPREGS, uintptr(tid), uintptr(0), uintptr(unsafe.Pointer(®set.AMD64PtraceFpRegs)), 0, 0) | ||
| if err == syscall.Errno(0) || err == syscall.ENODEV { | ||
| // ignore ENODEV, it just means this CPU doesn't have X87 registers (??) | ||
| err = nil | ||
| } | ||
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| var xstateargs [_X86_XSTATE_MAX_SIZE]byte | ||
| iov := sys.Iovec{Base: &xstateargs[0], Len: _X86_XSTATE_MAX_SIZE} | ||
| _, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(tid), _NT_X86_XSTATE, uintptr(unsafe.Pointer(&iov)), 0, 0) | ||
| if err != syscall.Errno(0) { | ||
| if err == syscall.ENODEV || err == syscall.EIO { | ||
| // ignore ENODEV, it just means this CPU or kernel doesn't support XSTATE, see https://github.com/go-delve/delve/issues/1022 | ||
| // also ignore EIO, it means that we are running on an old kernel (pre 2.6.34) and PTRACE_GETREGSET is not implemented | ||
| err = nil | ||
| } | ||
| return | ||
| } else { | ||
| err = nil | ||
| } | ||
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| regset.Xsave = xstateargs[:iov.Len] | ||
| err = linutil.AMD64XstateRead(regset.Xsave, false, ®set) | ||
| return | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package native | ||
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| import ( | ||
| "syscall" | ||
| "unsafe" | ||
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| sys "golang.org/x/sys/unix" | ||
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| "github.com/go-delve/delve/pkg/proc" | ||
| "github.com/go-delve/delve/pkg/proc/linutil" | ||
| ) | ||
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| func (t *Thread) restoreRegisters(savedRegs proc.Registers) error { | ||
| sr := savedRegs.(*linutil.AMD64Registers) | ||
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| var restoreRegistersErr error | ||
| t.dbp.execPtraceFunc(func() { | ||
| oldRegs := (*sys.PtraceRegs)(sr.Regs) | ||
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| var currentRegs sys.PtraceRegs | ||
| restoreRegistersErr = sys.PtraceGetRegs(t.ID, ¤tRegs) | ||
| if restoreRegistersErr != nil { | ||
| return | ||
| } | ||
| // restoreRegisters is only supposed to restore CPU registers, not FS_BASE and GS_BASE | ||
| oldRegs.Fs_base = currentRegs.Fs_base | ||
| oldRegs.Gs_base = currentRegs.Gs_base | ||
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| restoreRegistersErr = sys.PtraceSetRegs(t.ID, oldRegs) | ||
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| if restoreRegistersErr != nil { | ||
| return | ||
| } | ||
| if sr.Fpregset.Xsave != nil { | ||
| iov := sys.Iovec{Base: &sr.Fpregset.Xsave[0], Len: uint64(len(sr.Fpregset.Xsave))} | ||
| _, _, restoreRegistersErr = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETREGSET, uintptr(t.ID), _NT_X86_XSTATE, uintptr(unsafe.Pointer(&iov)), 0, 0) | ||
| return | ||
| } | ||
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| _, _, restoreRegistersErr = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETFPREGS, uintptr(t.ID), uintptr(0), uintptr(unsafe.Pointer(&sr.Fpregset.AMD64PtraceFpRegs)), 0, 0) | ||
| return | ||
| }) | ||
| if restoreRegistersErr == syscall.Errno(0) { | ||
| restoreRegistersErr = nil | ||
| } | ||
| return restoreRegistersErr | ||
| } |