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sh: Make syscall tracer use tracehook notifiers, add TIF_NOTIFY_RESUME.

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This follows the changes in commits:

7d6d637dac
4f72c4279e

on powerpc. Adding in TIF_NOTIFY_RESUME, and cleaning up the syscall
tracing to be more generic. This is an incremental step to turning
on tracehook, as well as unifying more of the ptrace and signal code
across the 32/64 split.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2008-07-30 19:55:30 +09:00
parent c459dbf294
commit ab99c733ae
7 changed files with 174 additions and 158 deletions
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12
arch/sh/kernel/entry-common.S
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@@ -211,10 +211,8 @@ syscall_exit_work:
nop
#endif
sti
! XXX setup arguments...
mov r15, r4
mov #1, r5
mov.l 4f, r0 ! do_syscall_trace
mov.l 8f, r0 ! do_syscall_trace_leave
jsr @r0
nop
bra resume_userspace
@@ -223,12 +221,11 @@ syscall_exit_work:
.align 2
syscall_trace_entry:
! Yes it is traced.
! XXX setup arguments...
mov r15, r4
mov #0, r5
mov.l 4f, r11 ! Call do_syscall_trace which notifies
mov.l 7f, r11 ! Call do_syscall_trace_enter which notifies
jsr @r11 ! superior (will chomp R[0-7])
nop
mov.l r0, @(OFF_R0,r15) ! Save return value
! Reload R0-R4 from kernel stack, where the
! parent may have modified them using
! ptrace(POKEUSR). (Note that R0-R2 are
@@ -389,8 +386,9 @@ syscall_exit:
#endif
2: .long NR_syscalls
3: .long sys_call_table
4: .long do_syscall_trace
#ifdef CONFIG_TRACE_IRQFLAGS
5: .long trace_hardirqs_on
6: .long trace_hardirqs_off
#endif
7: .long do_syscall_trace_enter
8: .long do_syscall_trace_leave