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https://github.com/golang/go
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1b49a86ece
The Go builders (and standard development cycle) for programs on iOS require running the programs under lldb. Unfortunately lldb intercepts SIGSEGV and will not give it back. https://llvm.org/bugs/show_bug.cgi?id=22868 We get around this by never letting lldb see the SIGSEGV. On darwin, Unix signals are emulated on top of mach exceptions. The debugger registers a task-level mach exception handler. We register a thread-level exception handler which acts as a faux signal handler. The thread-level handler gets precedence over the task-level handler, so we can turn the exception EXC_BAD_ACCESS into a panic before lldb can see it. Fixes #10043 Change-Id: I64d7c310dfa7ecf60eb1e59f094966520d473335 Reviewed-on: https://go-review.googlesource.com/7072 Reviewed-by: Minux Ma <minux@golang.org> Run-TryBot: David Crawshaw <crawshaw@golang.org>
54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
// Copyright 2014 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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// +build darwin dragonfly freebsd linux netbsd openbsd solaris
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package runtime
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func sigpanic() {
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g := getg()
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if !canpanic(g) {
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throw("unexpected signal during runtime execution")
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}
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switch g.sig {
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case _SIGBUS:
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if g.sigcode0 == _BUS_ADRERR && g.sigcode1 < 0x1000 || g.paniconfault {
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panicmem()
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}
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print("unexpected fault address ", hex(g.sigcode1), "\n")
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throw("fault")
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case _SIGSEGV:
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if (g.sigcode0 == 0 || g.sigcode0 == _SEGV_MAPERR || g.sigcode0 == _SEGV_ACCERR) && g.sigcode1 < 0x1000 || g.paniconfault {
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panicmem()
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}
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print("unexpected fault address ", hex(g.sigcode1), "\n")
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throw("fault")
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case _SIGFPE:
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switch g.sigcode0 {
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case _FPE_INTDIV:
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panicdivide()
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case _FPE_INTOVF:
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panicoverflow()
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}
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panicfloat()
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}
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if g.sig >= uint32(len(sigtable)) {
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// can't happen: we looked up g.sig in sigtable to decide to call sigpanic
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throw("unexpected signal value")
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}
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panic(errorString(sigtable[g.sig].name))
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}
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// setsigsegv is used on darwin/arm{,64} to fake a segmentation fault.
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//go:nosplit
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func setsigsegv(pc uintptr) {
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g := getg()
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g.sig = _SIGSEGV
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g.sigpc = pc
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g.sigcode0 = _SEGV_MAPERR
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g.sigcode1 = 0 // TODO: emulate si_addr
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}
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