9 files changed, 49 insertions, 13 deletions

diff --git a/arch/sh/kernel/cpu/clock.c b/arch/sh/kernel/cpu/clock.c
index f3a46be2ae81..83da5debeedf 100644
--- a/arch/sh/kernel/cpu/clock.c
+++ b/arch/sh/kernel/cpu/clock.c
@@ -598,7 +598,7 @@ static struct dentry *clk_debugfs_root;
 static int clk_debugfs_register_one(struct clk *c)
 {
         int err;
-        struct dentry *d, *child;
+        struct dentry *d, *child, *child_tmp;
         struct clk *pa = c->parent;
         char s[255];
         char *p = s;
@@ -630,7 +630,7 @@ static int clk_debugfs_register_one(struct clk *c)
 
 err_out:
         d = c->dentry;
-        list_for_each_entry(child, &d->d_subdirs, d_u.d_child)
+        list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
                 debugfs_remove(child);
         debugfs_remove(c->dentry);
         return err;
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 3576b709f052..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:
@@ -892,18 +912,18 @@ static struct unwinder dwarf_unwinder = {
 
 static void dwarf_unwinder_cleanup(void)
 {
-        struct dwarf_cie *cie;
-        struct dwarf_fde *fde;
+        struct dwarf_cie *cie, *cie_tmp;
+        struct dwarf_fde *fde, *fde_tmp;
 
         /*
          * Deallocate all the memory allocated for the DWARF unwinder.
          * Traverse all the FDE/CIE lists and remove and free all the
          * memory associated with those data structures.
          */
-        list_for_each_entry(cie, &dwarf_cie_list, link)
+        list_for_each_entry_safe(cie, cie_tmp, &dwarf_cie_list, link)
                 kfree(cie);
 
-        list_for_each_entry(fde, &dwarf_fde_list, link)
+        list_for_each_entry_safe(fde, fde_tmp, &dwarf_fde_list, link)
                 kfree(fde);
 
         kmem_cache_destroy(dwarf_reg_cachep);
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/process_64.c b/arch/sh/kernel/process_64.c
index 31f80c61b031..ec79faf6f021 100644
--- a/arch/sh/kernel/process_64.c
+++ b/arch/sh/kernel/process_64.c
@@ -368,7 +368,7 @@ void exit_thread(void)
 void flush_thread(void)
 {
 
-        /* Called by fs/exec.c (flush_old_exec) to remove traces of a
+        /* Called by fs/exec.c (setup_new_exec) to remove traces of a
          * previously running executable. */
 #ifdef CONFIG_SH_FPU
         if (last_task_used_math == current) {
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;
                 }
         }
diff --git a/arch/sh/kernel/syscalls_32.S b/arch/sh/kernel/syscalls_32.S
index 4bd5a1146956..19fd11dd9871 100644
--- a/arch/sh/kernel/syscalls_32.S
+++ b/arch/sh/kernel/syscalls_32.S
@@ -353,4 +353,3 @@ ENTRY(sys_call_table)
         .long sys_pwritev
         .long sys_rt_tgsigqueueinfo     /* 335 */
         .long sys_perf_event_open
-        .long sys_recvmmsg
diff --git a/arch/sh/kernel/syscalls_64.S b/arch/sh/kernel/syscalls_64.S
index 07d2aaea9ae8..2048a20d7c80 100644
--- a/arch/sh/kernel/syscalls_64.S
+++ b/arch/sh/kernel/syscalls_64.S
@@ -392,3 +392,4 @@ sys_call_table:
         .long sys_rt_tgsigqueueinfo
         .long sys_perf_event_open
         .long sys_recvmmsg              /* 365 */
+        .long sys_accept4