51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
// Copyright 2009 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 dragonfly linux netbsd
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package runtime
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import "unsafe"
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// Continuation of the (assembly) sigtramp() logic.
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// This may be called with the world stopped.
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//go:nosplit
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//go:nowritebarrierrec
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func sigtrampgo(sig uint32, info *siginfo, ctx unsafe.Pointer) {
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if sigfwdgo(sig, info, ctx) {
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return
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}
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g := getg()
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if g == nil {
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badsignal(uintptr(sig))
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return
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}
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// If some non-Go code called sigaltstack, adjust.
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sp := uintptr(unsafe.Pointer(&sig))
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if sp < g.m.gsignal.stack.lo || sp >= g.m.gsignal.stack.hi {
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var st sigaltstackt
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sigaltstack(nil, &st)
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if st.ss_flags&_SS_DISABLE != 0 {
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setg(nil)
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cgocallback(unsafe.Pointer(funcPC(noSignalStack)), noescape(unsafe.Pointer(&sig)), unsafe.Sizeof(sig))
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}
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stsp := uintptr(unsafe.Pointer(st.ss_sp))
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if sp < stsp || sp >= stsp+st.ss_size {
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setg(nil)
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cgocallback(unsafe.Pointer(funcPC(sigNotOnStack)), noescape(unsafe.Pointer(&sig)), unsafe.Sizeof(sig))
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}
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g.m.gsignal.stack.lo = stsp
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g.m.gsignal.stack.hi = stsp + st.ss_size
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g.m.gsignal.stackguard0 = stsp + _StackGuard
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g.m.gsignal.stackguard1 = stsp + _StackGuard
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g.m.gsignal.stackAlloc = st.ss_size
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g.m.gsignal.stktopsp = getcallersp(unsafe.Pointer(&sig))
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}
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setg(g.m.gsignal)
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sighandler(sig, info, ctx, g)
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setg(g)
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}
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