https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106813

--- gcc-12.1.0/libgo/runtime/go-signal.c
+++ gcc-12.1.0/libgo/runtime/go-signal.c
@@ -262,6 +262,12 @@
 	ret.sigpc = ((ucontext_t*)(context))->uc_mcontext.pc;
 #elif defined(__NetBSD__)
 	ret.sigpc = _UC_MACHINE_PC(((ucontext_t*)(context)));
+#elif defined(__x86_64__) && defined(__sun__)
+	ret.sigpc = ((ucontext_t*)(context))->uc_mcontext.gregs[REG_RIP];
+#elif defined(__i386__) && defined(__sun__)
+	ret.sigpc = ((ucontext_t*)(context))->uc_mcontext.gregs[REG_RIP];
+#elif defined(__sparc__) && defined(__sun__)
+	ret.sigpc = ((ucontext_t*)(context))->uc_mcontext.gregs[REG_PC];
 #endif
 
 	if (ret.sigpc == 0) {