sparc: Support show_unhandled_signals.

Just faults right now, will add other traps later.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/mm/fault_32.c b/arch/sparc/mm/fault_32.c
index a3413ac..ec8f22c 100644 (file)
--- a/arch/sparc/mm/fault_32.c
+++ b/arch/sparc/mm/fault_32.c
@@ -35,6 +35,8 @@
 
 extern int prom_node_root;
 
+int show_unhandled_signals = 1;
+
 /* At boot time we determine these two values necessary for setting
  * up the segment maps and page table entries (pte's).
  */
@@ -149,6 +151,45 @@ asmlinkage int lookup_fault(unsigned long pc, unsigned long ret_pc,
        return 0;
 }
 
+static inline void
+show_signal_msg(struct pt_regs *regs, int sig, int code,
+               unsigned long address, struct task_struct *tsk)
+{
+       if (!unhandled_signal(tsk, sig))
+               return;
+
+       if (!printk_ratelimit())
+               return;
+
+       printk("%s%s[%d]: segfault at %lx ip %p (rpc %p) sp %p error %x",
+              task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
+              tsk->comm, task_pid_nr(tsk), address,
+              (void *)regs->pc, (void *)regs->u_regs[UREG_I7],
+              (void *)regs->u_regs[UREG_FP], code);
+
+       print_vma_addr(KERN_CONT " in ", regs->pc);
+
+       printk(KERN_CONT "\n");
+}
+
+static void __do_fault_siginfo(int code, int sig, struct pt_regs *regs,
+                              unsigned long addr)
+{
+       siginfo_t info;
+
+       info.si_signo = sig;
+       info.si_code = code;
+       info.si_errno = 0;
+       info.si_addr = (void __user *) addr;
+       info.si_trapno = 0;
+
+       if (unlikely(show_unhandled_signals))
+               show_signal_msg(regs, sig, info.si_code,
+                               addr, current);
+
+       force_sig_info (sig, &info, current);
+}
+
 extern unsigned long safe_compute_effective_address(struct pt_regs *,
                                                    unsigned int);
 
@@ -168,6 +209,14 @@ static unsigned long compute_si_addr(struct pt_regs *regs, int text_fault)
        return safe_compute_effective_address(regs, insn);
 }
 
+static noinline void do_fault_siginfo(int code, int sig, struct pt_regs *regs,
+                                     int text_fault)
+{
+       unsigned long addr = compute_si_addr(regs, text_fault);
+
+       __do_fault_siginfo(code, sig, regs, addr);
+}
+
 asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
                               unsigned long address)
 {
@@ -176,9 +225,8 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
        struct mm_struct *mm = tsk->mm;
        unsigned int fixup;
        unsigned long g2;
-       siginfo_t info;
        int from_user = !(regs->psr & PSR_PS);
-       int fault;
+       int fault, code;
 
        if(text_fault)
                address = regs->pc;
@@ -195,7 +243,7 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
        if (!ARCH_SUN4C && address >= TASK_SIZE)
                goto vmalloc_fault;
 
-       info.si_code = SEGV_MAPERR;
+       code = SEGV_MAPERR;
 
        /*
         * If we're in an interrupt or have no user
@@ -229,7 +277,7 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
         * we can handle it..
         */
 good_area:
-       info.si_code = SEGV_ACCERR;
+       code = SEGV_ACCERR;
        if(write) {
                if(!(vma->vm_flags & VM_WRITE))
                        goto bad_area;
@@ -273,18 +321,8 @@ bad_area:
 
 bad_area_nosemaphore:
        /* User mode accesses just cause a SIGSEGV */
-       if(from_user) {
-#if 0
-               printk("Fault whee %s [%d]: segfaults at %08lx pc=%08lx\n",
-                      tsk->comm, tsk->pid, address, regs->pc);
-#endif
-               info.si_signo = SIGSEGV;
-               info.si_errno = 0;
-               /* info.si_code set above to make clear whether
-                  this was a SEGV_MAPERR or SEGV_ACCERR fault.  */
-               info.si_addr = (void __user *)compute_si_addr(regs, text_fault);
-               info.si_trapno = 0;
-               force_sig_info (SIGSEGV, &info, tsk);
+       if (from_user) {
+               do_fault_siginfo(code, SIGSEGV, regs, text_fault);
                return;
        }
 
@@ -335,12 +373,7 @@ out_of_memory:
 
 do_sigbus:
        up_read(&mm->mmap_sem);
-       info.si_signo = SIGBUS;
-       info.si_errno = 0;
-       info.si_code = BUS_ADRERR;
-       info.si_addr = (void __user *) compute_si_addr(regs, text_fault);
-       info.si_trapno = 0;
-       force_sig_info (SIGBUS, &info, tsk);
+       do_fault_siginfo(BUS_ADRERR, SIGBUS, regs, text_fault);
        if (!from_user)
                goto no_context;
 
@@ -466,14 +499,10 @@ static void force_user_fault(unsigned long address, int write)
        struct vm_area_struct *vma;
        struct task_struct *tsk = current;
        struct mm_struct *mm = tsk->mm;
-       siginfo_t info;
+       int code;
 
-       info.si_code = SEGV_MAPERR;
+       code = SEGV_MAPERR;
 
-#if 0
-       printk("wf<pid=%d,wr=%d,addr=%08lx>\n",
-              tsk->pid, write, address);
-#endif
        down_read(&mm->mmap_sem);
        vma = find_vma(mm, address);
        if(!vma)
@@ -485,7 +514,7 @@ static void force_user_fault(unsigned long address, int write)
        if(expand_stack(vma, address))
                goto bad_area;
 good_area:
-       info.si_code = SEGV_ACCERR;
+       code = SEGV_ACCERR;
        if(write) {
                if(!(vma->vm_flags & VM_WRITE))
                        goto bad_area;
@@ -502,27 +531,12 @@ good_area:
        return;
 bad_area:
        up_read(&mm->mmap_sem);
-#if 0
-       printk("Window whee %s [%d]: segfaults at %08lx\n",
-              tsk->comm, tsk->pid, address);
-#endif
-       info.si_signo = SIGSEGV;
-       info.si_errno = 0;
-       /* info.si_code set above to make clear whether
-          this was a SEGV_MAPERR or SEGV_ACCERR fault.  */
-       info.si_addr = (void __user *) address;
-       info.si_trapno = 0;
-       force_sig_info (SIGSEGV, &info, tsk);
+       __do_fault_siginfo(code, SIGSEGV, tsk->thread.kregs, address);
        return;
 
 do_sigbus:
        up_read(&mm->mmap_sem);
-       info.si_signo = SIGBUS;
-       info.si_errno = 0;
-       info.si_code = BUS_ADRERR;
-       info.si_addr = (void __user *) address;
-       info.si_trapno = 0;
-       force_sig_info (SIGBUS, &info, tsk);
+       __do_fault_siginfo(BUS_ADRERR, SIGBUS, tsk->thread.kregs, address);
 }
 
 void window_overflow_fault(void)

diff --git a/arch/sparc/mm/fault_64.c b/arch/sparc/mm/fault_64.c
index b9d4ff0..f92ce56 100644 (file)
--- a/arch/sparc/mm/fault_64.c
+++ b/arch/sparc/mm/fault_64.c
@@ -32,6 +32,8 @@
 #include <asm/sections.h>
 #include <asm/mmu_context.h>
 
+int show_unhandled_signals = 1;
+
 static inline __kprobes int notify_page_fault(struct pt_regs *regs)
 {
        int ret = 0;
@@ -128,22 +130,48 @@ outret:
        return insn;
 }
 
+static inline void
+show_signal_msg(struct pt_regs *regs, int sig, int code,
+               unsigned long address, struct task_struct *tsk)
+{
+       if (!unhandled_signal(tsk, sig))
+               return;
+
+       if (!printk_ratelimit())
+               return;
+
+       printk("%s%s[%d]: segfault at %lx ip %p (rpc %p) sp %p error %x",
+              task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
+              tsk->comm, task_pid_nr(tsk), address,
+              (void *)regs->tpc, (void *)regs->u_regs[UREG_I7],
+              (void *)regs->u_regs[UREG_FP], code);
+
+       print_vma_addr(KERN_CONT " in ", regs->tpc);
+
+       printk(KERN_CONT "\n");
+}
+
 extern unsigned long compute_effective_address(struct pt_regs *, unsigned int, unsigned int);
 
 static void do_fault_siginfo(int code, int sig, struct pt_regs *regs,
                             unsigned int insn, int fault_code)
 {
+       unsigned long addr;
        siginfo_t info;
 
        info.si_code = code;
        info.si_signo = sig;
        info.si_errno = 0;
        if (fault_code & FAULT_CODE_ITLB)
-               info.si_addr = (void __user *) regs->tpc;
+               addr = regs->tpc;
        else
-               info.si_addr = (void __user *)
-                       compute_effective_address(regs, insn, 0);
+               addr = compute_effective_address(regs, insn, 0);
+       info.si_addr = (void __user *) addr;
        info.si_trapno = 0;
+
+       if (unlikely(show_unhandled_signals))
+               show_signal_msg(regs, sig, code, addr, current);
+
        force_sig_info(sig, &info, current);
 }
 

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8a68b24..33e7a38 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1441,7 +1441,7 @@ static struct ctl_table fs_table[] = {
 };
 
 static struct ctl_table debug_table[] = {
-#if defined(CONFIG_X86) || defined(CONFIG_PPC)
+#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC)
        {
                .procname       = "exception-trace",
                .data           = &show_unhandled_signals,