From 2858f856021340f3730fa8639dd520a2e4331f7f Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Thu, 29 Mar 2012 16:11:09 -0400 Subject: arch/tile: fix single-stepping over swint1 instructions on tilegx 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 --- arch/tile/kernel/intvec_64.S | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S index 005535d108c..fdff17c70cc 100644 --- a/arch/tile/kernel/intvec_64.S +++ b/arch/tile/kernel/intvec_64.S @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -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: /* -- cgit v1.2.3