[PATCH] fix: support LoongArch64 in my-syscalls.S to resolve step-over-thread-exit-while-stop-all-threads.exp build failure

Coder_Y
2025-10-21T11:34:32Z

This patch adds syscall wrappers for LoongArch64 to gdb/testsuite/lib/my-syscalls.S.

- Implements the missing `__loongarch64` section
- Uses `lu12i.w` + `ori` to load the syscall number into `$a7`
- Triggers system calls via `syscall 0`
- Returns to caller using `jr $ra`

This change fixes build failures in LoongArch64 when running:
gdb.threads/step-over-thread-exit-while-stop-all-threads.exp

Tested on: loongarch64-unknown-linux-gnu
Result: expected testcases passed

Signed-off-by: Nick Young <zewyang@foxmail.com>
---
gdb/testsuite/lib/my-syscalls.S | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/gdb/testsuite/lib/my-syscalls.S b/gdb/testsuite/lib/my-syscalls.S
index c514b32d..a8862b5c 100644
--- a/gdb/testsuite/lib/my-syscalls.S
+++ b/gdb/testsuite/lib/my-syscalls.S
@@ -63,6 +63,19 @@ NAME: ;\
NAME ## _syscall: ;\
svc #0

+#elif defined(__loongarch64)
+
+/* LoongArch 64-bit syscall wrapper */
+#define SYSCALL(NAME, NR) \
+.global NAME ;\
+NAME: ;\
+ lu12i.w $a7, NR >> 12 ;\
+ ori $a7, $a7, NR & 0xfff ;\
+ /* syscall number */ \
+NAME ## _syscall: ;\
+ syscall 0 ;\
+ jr $ra
+
#else
# error "Unsupported architecture"
#endif
--
2.43.0