47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
// Copyright 2016 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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//go:build darwin || linux
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#include <stdint.h>
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#include "libcgo.h"
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#ifndef __has_feature
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#define __has_feature(x) 0
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#endif
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#if __has_feature(memory_sanitizer)
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#include <sanitizer/msan_interface.h>
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#endif
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// Call the user's traceback function and then call sigtramp.
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// The runtime signal handler will jump to this code.
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// We do it this way so that the user's traceback function will be called
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// by a C function with proper unwind info.
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void
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x_cgo_callers(uintptr_t sig, void *info, void *context, void (*cgoTraceback)(struct cgoTracebackArg*), uintptr_t* cgoCallers, void (*sigtramp)(uintptr_t, void*, void*)) {
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struct cgoTracebackArg arg;
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arg.Context = 0;
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arg.SigContext = (uintptr_t)(context);
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arg.Buf = cgoCallers;
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arg.Max = 32; // must match len(runtime.cgoCallers)
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#if __has_feature(memory_sanitizer)
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// This function is called directly from the signal handler.
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// The arguments are passed in registers, so whether msan
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// considers cgoCallers to be initialized depends on whether
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// it considers the appropriate register to be initialized.
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// That can cause false reports in rare cases.
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// Explicitly unpoison the memory to avoid that.
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// See issue #47543 for more details.
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__msan_unpoison(&arg, sizeof arg);
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#endif
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_cgo_tsan_acquire();
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(*cgoTraceback)(&arg);
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_cgo_tsan_release();
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sigtramp(sig, info, context);
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}
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