m68k: ptrace fixes
This fixes the following issues in ptrace:
- when single stepping into the signal handler stop at the first insn of
the handler
- handle non-zero stkadj when accessing pc and sr in ptregs
- correctly handle PT_SR in PTRACE_POKEUSR
- report -EIO when trying to read unknown offset in PTRACE_PEEKUSR
Additionally, the handling of the special case that PT_SR accesses a 16
bit word instead of a 32 bit word has been moved into get_reg/put_reg.
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index c5b3363..77fc7c1 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -179,7 +179,11 @@
addql #8,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
- jbra resume_userspace
+ tstl %d0
+ jeq resume_userspace
+ | when single stepping into handler stop at the first insn
+ btst #6,%curptr@(TASK_INFO+TINFO_FLAGS+2)
+ jeq resume_userspace
do_delayed_trace:
bclr #7,%sp@(PT_OFF_SR) | clear trace bit in SR