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runtime: merge sigpanic_unix.go into signal_unix.go

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Change-Id: Iba541045b4878405834c637095627631b6559a35
Reviewed-on: https://go-review.googlesource.com/29754
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Ian Lance Taylor 2016-09-24 21:17:34 -07:00
parent 38765eba73
commit 343bec53c7
2 changed files with 53 additions and 53 deletions
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53
src/runtime/signal_unix.go
View file

@ -196,6 +196,49 @@ func sigpipe() {
dieFromSignal(_SIGPIPE)
}
// sigpanic turns a synchronous signal into a run-time panic.
// If the signal handler sees a synchronous panic, it arranges the
// stack to look like the function where the signal occurred called
// sigpanic, sets the signal's PC value to sigpanic, and returns from
// the signal handler. The effect is that the program will act as
// though the function that got the signal simply called sigpanic
// instead.
func sigpanic() {
g := getg()
if !canpanic(g) {
throw("unexpected signal during runtime execution")
}
switch g.sig {
case _SIGBUS:
if g.sigcode0 == _BUS_ADRERR && g.sigcode1 < 0x1000 || g.paniconfault {
panicmem()
}
print("unexpected fault address ", hex(g.sigcode1), "\n")
throw("fault")
case _SIGSEGV:
if (g.sigcode0 == 0 || g.sigcode0 == _SEGV_MAPERR || g.sigcode0 == _SEGV_ACCERR) && g.sigcode1 < 0x1000 || g.paniconfault {
panicmem()
}
print("unexpected fault address ", hex(g.sigcode1), "\n")
throw("fault")
case _SIGFPE:
switch g.sigcode0 {
case _FPE_INTDIV:
panicdivide()
case _FPE_INTOVF:
panicoverflow()
}
panicfloat()
}
if g.sig >= uint32(len(sigtable)) {
// can't happen: we looked up g.sig in sigtable to decide to call sigpanic
throw("unexpected signal value")
}
panic(errorString(sigtable[g.sig].name))
}
// dieFromSignal kills the program with a signal.
// This provides the expected exit status for the shell.
// This is only called with fatal signals expected to kill the process.
@ -473,3 +516,13 @@ func unblocksig(sig int32) {
set := sigmaskToSigset(m)
sigprocmask(_SIG_UNBLOCK, &set, nil)
}
// setsigsegv is used on darwin/arm{,64} to fake a segmentation fault.
//go:nosplit
func setsigsegv(pc uintptr) {
g := getg()
g.sig = _SIGSEGV
g.sigpc = pc
g.sigcode0 = _SEGV_MAPERR
g.sigcode1 = 0 // TODO: emulate si_addr
}

53
src/runtime/sigpanic_unix.go
View file

@ -1,53 +0,0 @@
// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package runtime
func sigpanic() {
g := getg()
if !canpanic(g) {
throw("unexpected signal during runtime execution")
}
switch g.sig {
case _SIGBUS:
if g.sigcode0 == _BUS_ADRERR && g.sigcode1 < 0x1000 || g.paniconfault {
panicmem()
}
print("unexpected fault address ", hex(g.sigcode1), "\n")
throw("fault")
case _SIGSEGV:
if (g.sigcode0 == 0 || g.sigcode0 == _SEGV_MAPERR || g.sigcode0 == _SEGV_ACCERR) && g.sigcode1 < 0x1000 || g.paniconfault {
panicmem()
}
print("unexpected fault address ", hex(g.sigcode1), "\n")
throw("fault")
case _SIGFPE:
switch g.sigcode0 {
case _FPE_INTDIV:
panicdivide()
case _FPE_INTOVF:
panicoverflow()
}
panicfloat()
}
if g.sig >= uint32(len(sigtable)) {
// can't happen: we looked up g.sig in sigtable to decide to call sigpanic
throw("unexpected signal value")
}
panic(errorString(sigtable[g.sig].name))
}
// setsigsegv is used on darwin/arm{,64} to fake a segmentation fault.
//go:nosplit
func setsigsegv(pc uintptr) {
g := getg()
g.sig = _SIGSEGV
g.sigpc = pc
g.sigcode0 = _SEGV_MAPERR
g.sigcode1 = 0 // TODO: emulate si_addr
}