mirror of https://go.googlesource.com/go
88 lines
2.7 KiB
Go
88 lines
2.7 KiB
Go
// Copyright 2013 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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//go:build amd64 && (darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris)
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package runtime
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import (
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"internal/abi"
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"internal/goarch"
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"unsafe"
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)
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func dumpregs(c *sigctxt) {
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print("rax ", hex(c.rax()), "\n")
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print("rbx ", hex(c.rbx()), "\n")
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print("rcx ", hex(c.rcx()), "\n")
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print("rdx ", hex(c.rdx()), "\n")
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print("rdi ", hex(c.rdi()), "\n")
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print("rsi ", hex(c.rsi()), "\n")
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print("rbp ", hex(c.rbp()), "\n")
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print("rsp ", hex(c.rsp()), "\n")
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print("r8 ", hex(c.r8()), "\n")
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print("r9 ", hex(c.r9()), "\n")
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print("r10 ", hex(c.r10()), "\n")
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print("r11 ", hex(c.r11()), "\n")
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print("r12 ", hex(c.r12()), "\n")
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print("r13 ", hex(c.r13()), "\n")
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print("r14 ", hex(c.r14()), "\n")
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print("r15 ", hex(c.r15()), "\n")
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print("rip ", hex(c.rip()), "\n")
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print("rflags ", hex(c.rflags()), "\n")
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print("cs ", hex(c.cs()), "\n")
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print("fs ", hex(c.fs()), "\n")
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print("gs ", hex(c.gs()), "\n")
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}
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//go:nosplit
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//go:nowritebarrierrec
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func (c *sigctxt) sigpc() uintptr { return uintptr(c.rip()) }
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func (c *sigctxt) setsigpc(x uint64) { c.set_rip(x) }
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func (c *sigctxt) sigsp() uintptr { return uintptr(c.rsp()) }
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func (c *sigctxt) siglr() uintptr { return 0 }
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func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
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// preparePanic sets up the stack to look like a call to sigpanic.
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func (c *sigctxt) preparePanic(sig uint32, gp *g) {
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// Work around Leopard bug that doesn't set FPE_INTDIV.
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// Look at instruction to see if it is a divide.
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// Not necessary in Snow Leopard (si_code will be != 0).
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if GOOS == "darwin" && sig == _SIGFPE && gp.sigcode0 == 0 {
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pc := (*[4]byte)(unsafe.Pointer(gp.sigpc))
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i := 0
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if pc[i]&0xF0 == 0x40 { // 64-bit REX prefix
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i++
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} else if pc[i] == 0x66 { // 16-bit instruction prefix
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i++
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}
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if pc[i] == 0xF6 || pc[i] == 0xF7 {
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gp.sigcode0 = _FPE_INTDIV
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}
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}
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pc := uintptr(c.rip())
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sp := uintptr(c.rsp())
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// In case we are panicking from external code, we need to initialize
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// Go special registers. We inject sigpanic0 (instead of sigpanic),
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// which takes care of that.
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if shouldPushSigpanic(gp, pc, *(*uintptr)(unsafe.Pointer(sp))) {
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c.pushCall(abi.FuncPCABI0(sigpanic0), pc)
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} else {
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// Not safe to push the call. Just clobber the frame.
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c.set_rip(uint64(abi.FuncPCABI0(sigpanic0)))
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}
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}
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func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {
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// Make it look like we called target at resumePC.
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sp := uintptr(c.rsp())
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sp -= goarch.PtrSize
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*(*uintptr)(unsafe.Pointer(sp)) = resumePC
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c.set_rsp(uint64(sp))
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c.set_rip(uint64(targetPC))
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}
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