================
@@ -3032,6 +2983,162 @@ int UnwindCursor<A,
R>::stepThroughSigReturn(Registers_s390x &) {
#endif // defined(_LIBUNWIND_CHECK_LINUX_SIGRETURN) &&
// defined(_LIBUNWIND_TARGET_S390X)
+#if defined(_LIBUNWIND_CHECK_HAIKU_SIGRETURN)
+
+#if defined(B_HAIKU_32_BIT)
+typedef Elf32_Sym elf_sym;
+#define ELF_ST_TYPE ELF32_ST_TYPE
+#elif defined(B_HAIKU_64_BIT)
+typedef Elf64_Sym elf_sym;
+#define ELF_ST_TYPE ELF64_ST_TYPE
+#endif
+
+// Private syscall declared as a weak symbol to prevent ABI breaks.
+extern "C" status_t __attribute__((weak))
+_kern_read_kernel_image_symbols(image_id id, elf_sym *symbolTable,
+ int32 *_symbolCount, char *stringTable,
+ size_t *_stringTableSize, addr_t *_imageDelta);
+
+static addr_t signalHandlerBegin = 0;
+static addr_t signalHandlerEnd = 0;
+
+template <typename A, typename R>
+bool UnwindCursor<A, R>::setInfoForSigReturn() {
+ if (signalHandlerBegin == 0) {
+ // If we do not have the addresses yet, find them now.
+
+ // Determine if the private function is there and usable.
+ if (_kern_read_kernel_image_symbols == nullptr) {
+ signalHandlerBegin = (addr_t)-1;
+ return false;
+ }
+
+ // Get the system commpage and enumerate its symbols.
+ image_id commpageImage = -1;
+ image_info info;
+ int32 cookie = 0;
+ while (get_next_image_info(B_SYSTEM_TEAM, &cookie, &info) == B_OK) {
----------------
waddlesplash wrote:
Those sound like good ideas. What APIs do other OSes provide here, is there
something we can copy directly?
https://github.com/llvm/llvm-project/pull/135367
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