diff options
Diffstat (limited to 'arch/sh/kernel')
| -rw-r--r-- | arch/sh/kernel/cpu/sh3/entry.S | 3 | ||||
| -rw-r--r-- | arch/sh/kernel/dwarf.c | 20 | ||||
| -rw-r--r-- | arch/sh/kernel/entry-common.S | 8 | ||||
| -rw-r--r-- | arch/sh/kernel/ptrace_64.c | 11 | ||||
| -rw-r--r-- | arch/sh/kernel/signal_64.c | 4 |
5 files changed, 41 insertions, 5 deletions
diff --git a/arch/sh/kernel/cpu/sh3/entry.S b/arch/sh/kernel/cpu/sh3/entry.S index 3f7e2a22c7c2..f6a389c996cb 100644 --- a/arch/sh/kernel/cpu/sh3/entry.S +++ b/arch/sh/kernel/cpu/sh3/entry.S @@ -132,7 +132,6 @@ ENTRY(tlb_protection_violation_store) mov #1, r5 call_handle_tlbmiss: - setup_frame_reg mov.l 1f, r0 mov r5, r8 mov.l @r0, r6 @@ -365,6 +364,8 @@ handle_exception: mov.l @k2, k2 ! read out vector and keep in k2 handle_exception_special: + setup_frame_reg + ! Setup return address and jump to exception handler mov.l 7f, r9 ! fetch return address stc r2_bank, r0 ! k2 (vector) diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c index 88d28ec3780a..e51168064e56 100644 --- a/arch/sh/kernel/dwarf.c +++ b/arch/sh/kernel/dwarf.c @@ -540,6 +540,8 @@ void dwarf_free_frame(struct dwarf_frame *frame) mempool_free(frame, dwarf_frame_pool); } +extern void ret_from_irq(void); + /** * dwarf_unwind_stack - unwind the stack * @@ -678,6 +680,24 @@ struct dwarf_frame * dwarf_unwind_stack(unsigned long pc, addr = frame->cfa + reg->addr; frame->return_addr = __raw_readl(addr); + /* + * Ah, the joys of unwinding through interrupts. + * + * Interrupts are tricky - the DWARF info needs to be _really_ + * accurate and unfortunately I'm seeing a lot of bogus DWARF + * info. For example, I've seen interrupts occur in epilogues + * just after the frame pointer (r14) had been restored. The + * problem was that the DWARF info claimed that the CFA could be + * reached by using the value of the frame pointer before it was + * restored. + * + * So until the compiler can be trusted to produce reliable + * DWARF info when it really matters, let's stop unwinding once + * we've calculated the function that was interrupted. + */ + if (prev && prev->pc == (unsigned long)ret_from_irq) + frame->return_addr = 0; + return frame; bail: diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S index f0abd58c3a69..2b15ae60c3a0 100644 --- a/arch/sh/kernel/entry-common.S +++ b/arch/sh/kernel/entry-common.S @@ -70,8 +70,14 @@ ret_from_exception: CFI_STARTPROC simple CFI_DEF_CFA r14, 0 CFI_REL_OFFSET 17, 64 - CFI_REL_OFFSET 15, 0 + CFI_REL_OFFSET 15, 60 CFI_REL_OFFSET 14, 56 + CFI_REL_OFFSET 13, 52 + CFI_REL_OFFSET 12, 48 + CFI_REL_OFFSET 11, 44 + CFI_REL_OFFSET 10, 40 + CFI_REL_OFFSET 9, 36 + CFI_REL_OFFSET 8, 32 preempt_stop() ENTRY(ret_from_irq) ! diff --git a/arch/sh/kernel/ptrace_64.c b/arch/sh/kernel/ptrace_64.c index 873ebdc4f98e..b063eb8b18e3 100644 --- a/arch/sh/kernel/ptrace_64.c +++ b/arch/sh/kernel/ptrace_64.c @@ -133,6 +133,8 @@ void user_enable_single_step(struct task_struct *child) struct pt_regs *regs = child->thread.uregs; regs->sr |= SR_SSTEP; /* auto-resetting upon exception */ + + set_tsk_thread_flag(child, TIF_SINGLESTEP); } void user_disable_single_step(struct task_struct *child) @@ -140,6 +142,8 @@ void user_disable_single_step(struct task_struct *child) struct pt_regs *regs = child->thread.uregs; regs->sr &= ~SR_SSTEP; + + clear_tsk_thread_flag(child, TIF_SINGLESTEP); } static int genregs_get(struct task_struct *target, @@ -454,6 +458,8 @@ asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs) asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) { + int step; + if (unlikely(current->audit_context)) audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]), regs->regs[9]); @@ -461,8 +467,9 @@ asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) trace_sys_exit(regs, regs->regs[9]); - if (test_thread_flag(TIF_SYSCALL_TRACE)) - tracehook_report_syscall_exit(regs, 0); + step = test_thread_flag(TIF_SINGLESTEP); + if (step || test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_exit(regs, step); } /* Called with interrupts disabled */ diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c index ce76dbdef294..580e97d46ca5 100644 --- a/arch/sh/kernel/signal_64.c +++ b/arch/sh/kernel/signal_64.c @@ -118,7 +118,9 @@ static int do_signal(struct pt_regs *regs, sigset_t *oldset) * clear the TS_RESTORE_SIGMASK flag. */ current_thread_info()->status &= ~TS_RESTORE_SIGMASK; - tracehook_signal_handler(signr, &info, &ka, regs, 0); + + tracehook_signal_handler(signr, &info, &ka, regs, + test_thread_flag(TIF_SINGLESTEP)); return 1; } } |
