On Sun, 31 Aug 2025, Pali Rohár wrote:
diff --git a/mingw-w64-crt/misc/_invoke_watson.c
b/mingw-w64-crt/misc/_invoke_watson.c
new file mode 100644
index 000000000000..a7fa505024b2
--- /dev/null
+++ b/mingw-w64-crt/misc/_invoke_watson.c
@@ -0,0 +1,105 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the mingw-w64 runtime package.
+ * No warranty is given; refer to the file DISCLAIMER.PD within this package.
+ */
+
+#include <corecrt.h>
+#include <windows.h>
+
+#if defined(__i386__)
+DECLSPEC_NOINLINE /* decrease chance of modifying caller's registers and/or
stack frame */
+#endif
+static BOOL is_fastfail_available(void)
+{
+#if defined(__i386__)
+ HMODULE module = GetModuleHandleA("kernel32.dll");
+ BOOL (WINAPI *func)(DWORD) = module ? (LPVOID)GetProcAddress(module,
"IsProcessorFeaturePresent") : (LPVOID)NULL;
+ return func ? func(PF_FASTFAIL_AVAILABLE) : FALSE;
+#elif defined(__x86_64__)
+ return IsProcessorFeaturePresent(PF_FASTFAIL_AVAILABLE);
+#elif defined (__arm__) || defined(__aarch64__)
+ /* On ARM is fastfail always available */
+ return TRUE;
+#else
+#error Unsupported platform
+#endif
+}
+
+/* DECLSPEC_NOINLINE is needed for __builtin_return_address() and
__builtin_frame_address() usage */
+DECLSPEC_NOINLINE __MINGW_ATTRIB_NORETURN void __cdecl _invoke_watson(const
wchar_t * __UNUSED_PARAM(expression), const wchar_t *
__UNUSED_PARAM(function_name), const wchar_t * __UNUSED_PARAM(file_name),
unsigned int __UNUSED_PARAM(line_number), uintptr_t __UNUSED_PARAM(reserved))
+{
+ EXCEPTION_RECORD exception_record = { 0, };
+ CONTEXT context = { 0, };
+ EXCEPTION_POINTERS exception_pointers = { &exception_record, &context };
+#if defined(__x86_64__)
+ ULONG64 establisher_frame;
+ ULONG64 image_base;
+ PRUNTIME_FUNCTION function_entry;
+ PVOID handler_data;
+#endif
+
+ if (is_fastfail_available())
+ __fastfail(FAST_FAIL_INVALID_ARG);
+
+ /*
+ * RtlCaptureContext() is available since Windows XP.
+ * UCRT runtime uses inline assemly on 32-bit x86.
+ * For compatibility with UCRT do same thing.
+ */
+#if defined(__i386__)
+ asm volatile(
+ "mov %%eax, %0\n\t"
+ "mov %%ecx, %1\n\t"
+ "mov %%edx, %2\n\t"
+ "mov %%ebx, %3\n\t"
+ "mov %%esi, %4\n\t"
+ "mov %%edi, %5\n\t"
+ "movw %%ss, %w6\n\t"
+ "movw %%cs, %w7\n\t"
+ "movw %%ds, %w8\n\t"
+ "movw %%es, %w9\n\t"
+ "movw %%fs, %w10\n\t"
+ "movw %%gs, %w11\n\t"
+ "pushf\n\t"
+ "pop %12"
+ :
+ /* Specify only "m" (memory) to prevent using registers and clobbering
their content. */
+ "=m" (context.Eax), "=m" (context.Ecx), "=m" (context.Edx),
+ "=m" (context.Ebx), "=m" (context.Esi), "=m" (context.Edi),
+ "=m" (context.SegSs), "=m" (context.SegCs), "=m" (context.SegDs),
+ "=m" (context.SegEs), "=m" (context.SegFs), "=m" (context.SegGs),
+ "=m" (context.EFlags)
+ :
+ :
+ );
+#else
+ RtlCaptureContext(&context);
+#endif
+
+ /* Fill additional platform specific fields of the parent (caller)
function into context. */
+#if defined(__i386__)
+ context.ContextFlags = CONTEXT_CONTROL;
+ context.Eip =
(uintptr_t)__builtin_extract_return_addr(__builtin_return_address(0)); /* msvc
uses _ReturnAddress() */
+ context.Esp = (uintptr_t)__builtin_frame_address(0); /* msvc uses
_AddressOfReturnAddress() */
+ context.Ebp = *((uintptr_t *)__builtin_frame_address(0)-1); /* msvc uses
*((ULONG *)_AddressOfReturnAddress()-1) */
+#elif defined(__x86_64__)
+ function_entry = RtlLookupFunctionEntry(context.Rip, &image_base, NULL);
+ if (function_entry)
+ RtlVirtualUnwind(UNW_FLAG_NHANDLER, image_base, context.Rip, function_entry,
&context, &handler_data, &establisher_frame, NULL);
+ context.Rip =
(uintptr_t)__builtin_extract_return_addr(__builtin_return_address(0)); /* msvc
uses _ReturnAddress() */
+ context.Rsp = (uintptr_t)__builtin_frame_address(0); /* msvc uses
_AddressOfReturnAddress()+8 */
+ context.Rbp = *((uintptr_t *)__builtin_frame_address(0)-1); /* not filled
filled by msvc */
+#endif
Shouldn't we do something similar to this for arm/aarch64 too?
// Martin
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