[unwind] Handle UNW_X86_64_RIP register
In some binaries, built with clang/lld, libunwind crashes
with "unsupported x86_64 register" for regNum == 16:
Differential Revision: https://reviews.llvm.org/D107919
NOKEYCHECK=True
GitOrigin-RevId: 2f1ee56f3cb8adb5aeadba3f66a8fc39fba1604d
diff --git a/test/libunwind_01.pass.cpp b/test/libunwind_01.pass.cpp
index 191684d..277e3e6 100644
--- a/test/libunwind_01.pass.cpp
+++ b/test/libunwind_01.pass.cpp
@@ -1,5 +1,6 @@
#include <libunwind.h>
#include <stdlib.h>
+#include <string.h>
void backtrace(int lower_bound) {
unw_context_t context;
@@ -55,10 +56,83 @@
abort();
}
+void test_reg_names() {
+ unw_context_t context;
+ unw_getcontext(&context);
+
+ unw_cursor_t cursor;
+ unw_init_local(&cursor, &context);
+
+ int max_reg_num = -100;
+#if defined(__i386__)
+ max_reg_num = 7;
+#elif defined(__x86_64__)
+ max_reg_num = 32;
+#endif
+
+ const char prefix[] = "unknown";
+ for (int i = -2; i < max_reg_num; ++i) {
+ if (strncmp(prefix, unw_regname(&cursor, i), sizeof(prefix) - 1) == 0)
+ abort();
+ }
+
+ if (strncmp(prefix, unw_regname(&cursor, max_reg_num + 1),
+ sizeof(prefix) - 1) != 0)
+ abort();
+}
+
+#if defined(__x86_64__)
+void test_reg_get_set() {
+ unw_context_t context;
+ unw_getcontext(&context);
+
+ unw_cursor_t cursor;
+ unw_init_local(&cursor, &context);
+
+ for (int i = 0; i < 17; ++i) {
+ const unw_word_t set_value = 7;
+ if (unw_set_reg(&cursor, i, set_value) != UNW_ESUCCESS)
+ abort();
+
+ unw_word_t get_value = 0;
+ if (unw_get_reg(&cursor, i, &get_value) != UNW_ESUCCESS)
+ abort();
+
+ if (set_value != get_value)
+ abort();
+ }
+}
+
+void test_fpreg_get_set() {
+ unw_context_t context;
+ unw_getcontext(&context);
+
+ unw_cursor_t cursor;
+ unw_init_local(&cursor, &context);
+
+ // get/set is not implemented for x86_64 fpregs.
+ for (int i = 17; i < 33; ++i) {
+ const unw_fpreg_t set_value = 7;
+ if (unw_set_fpreg(&cursor, i, set_value) != UNW_EBADREG)
+ abort();
+
+ unw_fpreg_t get_value = 0;
+ if (unw_get_fpreg(&cursor, i, &get_value) != UNW_EBADREG)
+ abort();
+ }
+}
+#else
+void test_reg_get_set() {}
+void test_fpreg_get_set() {}
+#endif
+
int main(int, char**) {
test1(1);
test2(1, 2);
test3(1, 2, 3);
test_no_info();
+ test_reg_names();
+ test_reg_get_set();
+ test_fpreg_get_set();
return 0;
}