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runtime: tricky replacements of _g_ in signal_windows.go

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winthrow is always called on g0.

Change-Id: Ia23276a5bd545993faf4d75368c171f6ea7a3034
Reviewed-on: https://go-review.googlesource.com/c/go/+/418581
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Michael Pratt 2022-07-20 11:38:29 -04:00
parent 8666d89ca8
commit 4240ff764b
1 changed files with 9 additions and 8 deletions
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17
src/runtime/signal_windows.go
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@ -199,9 +199,10 @@ func lastcontinuehandler(info *exceptionrecord, r *context, gp *g) int32 {
return 0 // not reached
}
// Always called on g0. gp is the G where the exception occurred.
//go:nosplit
func winthrow(info *exceptionrecord, r *context, gp *g) {
_g_ := getg()
g0 := getg()
if panicking != 0 { // traceback already printed
exit(2)
@ -211,23 +212,23 @@ func winthrow(info *exceptionrecord, r *context, gp *g) {
// In case we're handling a g0 stack overflow, blow away the
// g0 stack bounds so we have room to print the traceback. If
// this somehow overflows the stack, the OS will trap it.
_g_.stack.lo = 0
_g_.stackguard0 = _g_.stack.lo + _StackGuard
_g_.stackguard1 = _g_.stackguard0
g0.stack.lo = 0
g0.stackguard0 = g0.stack.lo + _StackGuard
g0.stackguard1 = g0.stackguard0
print("Exception ", hex(info.exceptioncode), " ", hex(info.exceptioninformation[0]), " ", hex(info.exceptioninformation[1]), " ", hex(r.ip()), "\n")
print("PC=", hex(r.ip()), "\n")
if _g_.m.incgo && gp == _g_.m.g0 && _g_.m.curg != nil {
if g0.m.incgo && gp == g0.m.g0 && g0.m.curg != nil {
if iscgo {
print("signal arrived during external code execution\n")
}
gp = _g_.m.curg
gp = g0.m.curg
}
print("\n")
_g_.m.throwing = throwTypeRuntime
_g_.m.caughtsig.set(gp)
g0.m.throwing = throwTypeRuntime
g0.m.caughtsig.set(gp)
level, _, docrash := gotraceback()
if level > 0 {