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// Copyright 2010 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.
package runtime
import (
"internal/abi"
"internal/goarch"
"unsafe"
)
// May run during STW, so write barriers are not allowed.
//
//go:nowritebarrierrec
func sighandler(_ureg *ureg, note *byte, gp *g) int {
gsignal := getg()
mp := gsignal.m
var t sigTabT
var docrash bool
var sig int
var flags int
var level int32
c := &sigctxt{_ureg}
notestr := gostringnocopy(note)
// The kernel will never pass us a nil note or ureg so we probably
// made a mistake somewhere in sigtramp.
if _ureg == nil || note == nil {
print("sighandler: ureg ", _ureg, " note ", note, "\n")
goto Throw
}
// Check that the note is no more than ERRMAX bytes (including
// the trailing NUL). We should never receive a longer note.
if len(notestr) > _ERRMAX-1 {
print("sighandler: note is longer than ERRMAX\n")
goto Throw
}
if isAbortPC(c.pc()) {
// Never turn abort into a panic.
goto Throw
}
// See if the note matches one of the patterns in sigtab.
// Notes that do not match any pattern can be handled at a higher
// level by the program but will otherwise be ignored.
flags = _SigNotify
for sig, t = range sigtable {
if hasPrefix(notestr, t.name) {
flags = t.flags
break
}
}
if flags&_SigPanic != 0 && gp.throwsplit {
// We can't safely sigpanic because it may grow the
// stack. Abort in the signal handler instead.
flags = (flags &^ _SigPanic) | _SigThrow
}
if flags&_SigGoExit != 0 {
exits((*byte)(add(unsafe.Pointer(note), 9))) // Strip "go: exit " prefix.
}
if flags&_SigPanic != 0 {
// Copy the error string from sigtramp's stack into m->notesig so
// we can reliably access it from the panic routines.
memmove(unsafe.Pointer(mp.notesig), unsafe.Pointer(note), uintptr(len(notestr)+1))
gp.sig = uint32(sig)
gp.sigpc = c.pc()
pc := c.pc()
sp := c.sp()
// If we don't recognize the PC as code
// but we do recognize the top pointer on the stack as code,
// then assume this was a call to non-code and treat like
// pc == 0, to make unwinding show the context.
if pc != 0 && !findfunc(pc).valid() && findfunc(*(*uintptr)(unsafe.Pointer(sp))).valid() {
pc = 0
}
// IF LR exists, sigpanictramp must save it to the stack
// before entry to sigpanic so that panics in leaf
// functions are correctly handled. This will smash
// the stack frame but we're not going back there
// anyway.
if usesLR {
c.savelr(c.lr())
}
// If PC == 0, probably panicked because of a call to a nil func.
// Not faking that as the return address will make the trace look like a call
// to sigpanic instead. (Otherwise the trace will end at
// sigpanic and we won't get to see who faulted).
if pc != 0 {
if usesLR {
c.setlr(pc)
} else {
sp -= goarch.PtrSize
*(*uintptr)(unsafe.Pointer(sp)) = pc
c.setsp(sp)
}
}
if usesLR {
c.setpc(abi.FuncPCABI0(sigpanictramp))
} else {
c.setpc(abi.FuncPCABI0(sigpanic0))
}
return _NCONT
}
if flags&_SigNotify != 0 {
if ignoredNote(note) {
return _NCONT
}
if sendNote(note) {
return _NCONT
}
}
if flags&_SigKill != 0 {
goto Exit
}
if flags&_SigThrow == 0 {
return _NCONT
}
Throw:
mp.throwing = throwTypeRuntime
mp.caughtsig.set(gp)
startpanic_m()
print(notestr, "\n")
print("PC=", hex(c.pc()), "\n")
print("\n")
level, _, docrash = gotraceback()
if level > 0 {
goroutineheader(gp)
tracebacktrap(c.pc(), c.sp(), c.lr(), gp)
tracebackothers(gp)
print("\n")
dumpregs(_ureg)
}
if docrash {
crash()
}
Exit:
goexitsall(note)
exits(note)
return _NDFLT // not reached
}
func sigenable(sig uint32) {
}
func sigdisable(sig uint32) {
}
func sigignore(sig uint32) {
}
func setProcessCPUProfiler(hz int32) {
}
func setThreadCPUProfiler(hz int32) {
// TODO: Enable profiling interrupts.
getg().m.profilehz = hz
}
// gsignalStack is unused on Plan 9.
type gsignalStack struct{}