On Mon, 17 Feb 2025, Dmitry V. Levin wrote:
diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index ea050b23d428..b956b015641c 100644
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -41,6 +41,20 @@ static inline long syscall_get_nr(struct task_struct *task,
return task_thread_info(task)->syscall;
}
+static inline void syscall_set_nr(struct task_struct *task,
+ struct pt_regs *regs,
+ int nr)
+{
+ /*
+ * New syscall number has to be assigned to regs[2] because
+ * syscall_trace_entry() loads it from there unconditionally.
That label is called `trace_a_syscall' in arch/mips/kernel/scall64-o32.S
instead. To bring some order and avoid an inaccuracy here should the odd
one be matched to the other three?
+ *
+ * Consequently, if the syscall was indirect and nr != __NR_syscall,
+ * then after this assignment the syscall will cease to be indirect.
+ */
+ task_thread_info(task)->syscall = regs->regs[2] = nr;
+}
+
static inline void mips_syscall_update_nr(struct task_struct *task,
struct pt_regs *regs)
{
Otherwise:
Reviewed-by: Maciej W. Rozycki <macro@xxxxxxxxxxx>
for this part, thank you!
Maciej
