blob: 248576a10246bae170aec702765bec5f4c759dd6 [file] [log] [blame]
// 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 "unsafe"
// May run during STW, so write barriers are not allowed.
//go:nowritebarrier
func sighandler(_ureg *ureg, note *byte, gp *g) int {
_g_ := getg()
var t sigTabT
var docrash bool
var sig int
var flags int
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
}
// 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&_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(_g_.m.notesig), unsafe.Pointer(note), uintptr(len(notestr)+1))
gp.sig = uint32(sig)
gp.sigpc = c.pc()
// Only push sigpanic if PC != 0.
//
// If PC == 0, probably panicked because of a call to a nil func.
// Not pushing that onto SP 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 c.pc() != 0 {
sp := c.sp()
if regSize > ptrSize {
sp -= ptrSize
*(*uintptr)(unsafe.Pointer(sp)) = 0
}
sp -= ptrSize
*(*uintptr)(unsafe.Pointer(sp)) = c.pc()
c.setsp(sp)
}
c.setpc(funcPC(sigpanic))
return _NCONT
}
if flags&_SigNotify != 0 {
if sendNote(note) {
return _NCONT
}
}
if flags&_SigKill != 0 {
goto Exit
}
if flags&_SigThrow == 0 {
return _NCONT
}
Throw:
_g_.m.throwing = 1
_g_.m.caughtsig.set(gp)
startpanic()
print(notestr, "\n")
print("PC=", hex(c.pc()), "\n")
print("\n")
if gotraceback(&docrash) > 0 {
goroutineheader(gp)
tracebacktrap(c.pc(), c.sp(), 0, 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 resetcpuprofiler(hz int32) {
// TODO: Enable profiling interrupts.
getg().m.profilehz = hz
}