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arch/tile: fix single-stepping over swint1 instructions on tilegx

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If we are single-stepping and make a syscall, we call ptrace_notify()
explicitly on the return path back to user space, since we are returning
to a pc value set artificially to the next instruction, and otherwise
we won't register that we stepped over the syscall instruction (swint1).

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf 2012-03-29 16:11:09 -04:00
parent cb210ee3a8
commit 2858f85602
1 changed files with 18 additions and 3 deletions
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21
arch/tile/kernel/intvec_64.S
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@ -22,6 +22,7 @@
#include <asm/irqflags.h>
#include <asm/asm-offsets.h>
#include <asm/types.h>
#include <asm/signal.h>
#include <hv/hypervisor.h>
#include <arch/abi.h>
#include <arch/interrupts.h>
@ -1039,11 +1040,25 @@ handle_syscall:
/* Do syscall trace again, if requested. */
ld r30, r31
andi r30, r30, _TIF_SYSCALL_TRACE
beqzt r30, 1f
andi r0, r30, _TIF_SYSCALL_TRACE
{
andi r0, r30, _TIF_SINGLESTEP
beqzt r0, 1f
}
jal do_syscall_trace
FEEDBACK_REENTER(handle_syscall)
1: j .Lresume_userspace /* jump into middle of interrupt_return */
andi r0, r30, _TIF_SINGLESTEP
1: beqzt r0, 2f
/* Single stepping -- notify ptrace. */
{
movei r0, SIGTRAP
jal ptrace_notify
}
FEEDBACK_REENTER(handle_syscall)
2: j .Lresume_userspace /* jump into middle of interrupt_return */
.Lcompat_syscall:
/*