parisc: split syscall_trace into two halves
Instead of fiddling with gr[20], restructure code to return whether
or not to -ENOSYS. (Also do a bit of fiddling to let them take
pt_regs directly instead of re-computing it.)
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 07de1bb..f5f9602 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -288,19 +288,23 @@
STREG %r18,PT_GR18(%r2)
/* Finished saving things for the debugger */
- ldi 0,%r26 /* syscall entry */
- ldil L%syscall_trace,%r1
+ copy %r2,%r26
+ ldil L%do_syscall_trace_enter,%r1
ldil L%tracesys_next,%r2
- be R%syscall_trace(%sr7,%r1)
+ be R%do_syscall_trace_enter(%sr7,%r1)
ldo R%tracesys_next(%r2),%r2
-tracesys_next:
+tracesys_next:
+ /* do_syscall_trace_enter either returned the syscallno, or -1L,
+ * so we skip restoring the PT_GR20 below, since we pulled it from
+ * task->thread.regs.gr[20] above.
+ */
+ copy %ret0,%r20
ldil L%sys_call_table,%r1
ldo R%sys_call_table(%r1), %r19
ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */
LDREG TI_TASK(%r1), %r1
- LDREG TASK_PT_GR20(%r1), %r20
LDREG TASK_PT_GR26(%r1), %r26 /* Restore the users args */
LDREG TASK_PT_GR25(%r1), %r25
LDREG TASK_PT_GR24(%r1), %r24
@@ -337,8 +341,8 @@
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
- ldi 1,%r26 /* syscall exit */
- bl syscall_trace, %r2
+ ldo TASK_REGS(%r1),%r26
+ bl do_syscall_trace_exit,%r2
STREG %r28,TASK_PT_GR28(%r1) /* save return value now */
ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */
LDREG TI_TASK(%r1), %r1
@@ -359,8 +363,8 @@
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
- bl syscall_trace, %r2
- ldi 1,%r26 /* syscall exit */
+ bl do_syscall_trace_exit,%r2
+ ldo TASK_REGS(%r1),%r26
ldil L%syscall_exit_rfi,%r1
be,n R%syscall_exit_rfi(%sr7,%r1)