On Tue, 2021-07-06 at 12:18 +0800, Huacai Chen wrote:

+/**
+ * struct ucontext - user context structure
+ * @uc_flags:
+ * @uc_link:
+ * @uc_stack:
+ * @uc_mcontext:       holds basic processor state
+ * @uc_sigmask:
+ * @uc_extcontext:     holds extended processor state
+ */
+struct ucontext {
+       /* Historic fields matching asm-generic */
+       unsigned long           uc_flags;
+       struct ucontext         *uc_link;
+       stack_t                 uc_stack;
+       struct sigcontext       uc_mcontext;
+       sigset_t                uc_sigmask;
+
+       /* Extended context structures may follow ucontext */
+       unsigned long long      uc_extcontext[0];
+};
+
+#endif /* __LOONGARCH_UAPI_ASM_UCONTEXT_H */

Hi Huacai,

Maybe this is off topic, but I just seen something damn particular in
your workmates' glibc repo:

https://github.com/loongson/glibc/commit/86d7512949640642cdf767fb6beb077d446b2857
"Modify struct mcontext_t and ucontext_t layout":

AFAIK if this doesn't match the struct ucontext definition above, the
system will just blow up?  Have you coordinated with the change?