Merge ../linux-2.6

[linux-2.6-omap-h63xx.git] / arch / ppc / kernel / traps.c

diff --git a/arch/ppc/kernel/traps.c b/arch/ppc/kernel/traps.c
index 8356d544fa60dc3cbda579cc43c075637bddbaf3..42d980e82bdc021ced1e90bd8b1b420bf5bd9c02 100644 (file)
--- a/arch/ppc/kernel/traps.c
+++ b/arch/ppc/kernel/traps.c
@@ -41,9 +41,14 @@
 #ifdef CONFIG_PMAC_BACKLIGHT
 #include <asm/backlight.h>
 #endif
-#include <asm/perfmon.h>
+#include <asm/pmc.h>
 
 #ifdef CONFIG_XMON
+extern int xmon_bpt(struct pt_regs *regs);
+extern int xmon_sstep(struct pt_regs *regs);
+extern int xmon_iabr_match(struct pt_regs *regs);
+extern int xmon_dabr_match(struct pt_regs *regs);
+
 void (*debugger)(struct pt_regs *regs) = xmon;
 int (*debugger_bpt)(struct pt_regs *regs) = xmon_bpt;
 int (*debugger_sstep)(struct pt_regs *regs) = xmon_sstep;
@@ -74,7 +79,7 @@ void (*debugger_fault_handler)(struct pt_regs *regs);
 
 DEFINE_SPINLOCK(die_lock);
 
-void die(const char * str, struct pt_regs * fp, long err)
+int die(const char * str, struct pt_regs * fp, long err)
 {
        static int die_counter;
        int nl = 0;
@@ -118,6 +123,28 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
        info.si_code = code;
        info.si_addr = (void __user *) addr;
        force_sig_info(signr, &info, current);
+
+       /*
+        * Init gets no signals that it doesn't have a handler for.
+        * That's all very well, but if it has caused a synchronous
+        * exception and we ignore the resulting signal, it will just
+        * generate the same exception over and over again and we get
+        * nowhere.  Better to kill it and let the kernel panic.
+        */
+       if (current->pid == 1) {
+               __sighandler_t handler;
+
+               spin_lock_irq(&current->sighand->siglock);
+               handler = current->sighand->action[signr-1].sa.sa_handler;
+               spin_unlock_irq(&current->sighand->siglock);
+               if (handler == SIG_DFL) {
+                       /* init has generated a synchronous exception
+                          and it doesn't have a handler for the signal */
+                       printk(KERN_CRIT "init has generated signal %d "
+                              "but has no handler for it\n", signr);
+                       do_exit(signr);
+               }
+       }
 }
 
 /*
@@ -132,7 +159,7 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
  */
 static inline int check_io_access(struct pt_regs *regs)
 {
-#ifdef CONFIG_PPC_PMAC
+#if defined CONFIG_PPC_PMAC || defined CONFIG_8xx
        unsigned long msr = regs->msr;
        const struct exception_table_entry *entry;
        unsigned int *nip = (unsigned int *)regs->nip;
@@ -151,7 +178,11 @@ static inline int check_io_access(struct pt_regs *regs)
                        nip -= 2;
                else if (*nip == 0x4c00012c)    /* isync */
                        --nip;
-               if (*nip == 0x7c0004ac || (*nip >> 26) == 3) {
+               /* eieio from I/O string functions */
+               else if ((*nip) == 0x7c0006ac || *(nip+1) == 0x7c0006ac)
+                       nip += 2;
+               if (*nip == 0x7c0004ac || (*nip >> 26) == 3 ||
+                       (*(nip+1) >> 26) == 3) {
                        /* sync or twi */
                        unsigned int rb;
 
@@ -210,7 +241,7 @@ platform_machine_check(struct pt_regs *regs)
 {
 }
 
-void MachineCheckException(struct pt_regs *regs)
+void machine_check_exception(struct pt_regs *regs)
 {
        unsigned long reason = get_mc_reason(regs);
 
@@ -371,14 +402,14 @@ void SMIException(struct pt_regs *regs)
 #endif
 }
 
-void UnknownException(struct pt_regs *regs)
+void unknown_exception(struct pt_regs *regs)
 {
        printk("Bad trap at PC: %lx, MSR: %lx, vector=%lx    %s\n",
               regs->nip, regs->msr, regs->trap, print_tainted());
        _exception(SIGTRAP, regs, 0, 0);
 }
 
-void InstructionBreakpoint(struct pt_regs *regs)
+void instruction_breakpoint_exception(struct pt_regs *regs)
 {
        if (debugger_iabr_match(regs))
                return;
@@ -553,7 +584,7 @@ extern struct bug_entry __start___bug_table[], __stop___bug_table[];
 #define module_find_bug(x)     NULL
 #endif
 
-static struct bug_entry *find_bug(unsigned long bugaddr)
+struct bug_entry *find_bug(unsigned long bugaddr)
 {
        struct bug_entry *bug;
 
@@ -579,28 +610,28 @@ int check_bug_trap(struct pt_regs *regs)
        if (bug->line & BUG_WARNING_TRAP) {
                /* this is a WARN_ON rather than BUG/BUG_ON */
 #ifdef CONFIG_XMON
-               xmon_printf(KERN_ERR "Badness in %s at %s:%d\n",
+               xmon_printf(KERN_ERR "Badness in %s at %s:%ld\n",
                       bug->function, bug->file,
                       bug->line & ~BUG_WARNING_TRAP);
 #endif /* CONFIG_XMON */               
-               printk(KERN_ERR "Badness in %s at %s:%d\n",
+               printk(KERN_ERR "Badness in %s at %s:%ld\n",
                       bug->function, bug->file,
                       bug->line & ~BUG_WARNING_TRAP);
                dump_stack();
                return 1;
        }
 #ifdef CONFIG_XMON
-       xmon_printf(KERN_CRIT "kernel BUG in %s at %s:%d!\n",
+       xmon_printf(KERN_CRIT "kernel BUG in %s at %s:%ld!\n",
               bug->function, bug->file, bug->line);
        xmon(regs);
 #endif /* CONFIG_XMON */
-       printk(KERN_CRIT "kernel BUG in %s at %s:%d!\n",
+       printk(KERN_CRIT "kernel BUG in %s at %s:%ld!\n",
               bug->function, bug->file, bug->line);
 
        return 0;
 }
 
-void ProgramCheckException(struct pt_regs *regs)
+void program_check_exception(struct pt_regs *regs)
 {
        unsigned int reason = get_reason(regs);
        extern int do_mathemu(struct pt_regs *regs);
@@ -632,7 +663,7 @@ void ProgramCheckException(struct pt_regs *regs)
                        giveup_fpu(current);
                preempt_enable();
 
-               fpscr = current->thread.fpscr;
+               fpscr = current->thread.fpscr.val;
                fpscr &= fpscr << 22;   /* mask summary bits with enables */
                if (fpscr & FPSCR_VX)
                        code = FPE_FLTINV;
@@ -679,7 +710,7 @@ void ProgramCheckException(struct pt_regs *regs)
                _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
 }
 
-void SingleStepException(struct pt_regs *regs)
+void single_step_exception(struct pt_regs *regs)
 {
        regs->msr &= ~(MSR_SE | MSR_BE);  /* Turn off 'trace' bits */
        if (debugger_sstep(regs))
@@ -687,7 +718,7 @@ void SingleStepException(struct pt_regs *regs)
        _exception(SIGTRAP, regs, TRAP_TRACE, 0);
 }
 
-void AlignmentException(struct pt_regs *regs)
+void alignment_exception(struct pt_regs *regs)
 {
        int fixed;
 
@@ -792,7 +823,18 @@ void TAUException(struct pt_regs *regs)
 }
 #endif /* CONFIG_INT_TAU */
 
-void AltivecUnavailException(struct pt_regs *regs)
+/*
+ * FP unavailable trap from kernel - print a message, but let
+ * the task use FP in the kernel until it returns to user mode.
+ */
+void kernel_fp_unavailable_exception(struct pt_regs *regs)
+{
+       regs->msr |= MSR_FP;
+       printk(KERN_ERR "floating point used in kernel (task=%p, pc=%lx)\n",
+              current, regs->nip);
+}
+
+void altivec_unavailable_exception(struct pt_regs *regs)
 {
        static int kernel_altivec_count;
 
@@ -813,7 +855,7 @@ void AltivecUnavailException(struct pt_regs *regs)
 }
 
 #ifdef CONFIG_ALTIVEC
-void AltivecAssistException(struct pt_regs *regs)
+void altivec_assist_exception(struct pt_regs *regs)
 {
        int err;
 
@@ -850,7 +892,7 @@ void AltivecAssistException(struct pt_regs *regs)
 #endif /* CONFIG_ALTIVEC */
 
 #ifdef CONFIG_E500
-void PerformanceMonitorException(struct pt_regs *regs)
+void performance_monitor_exception(struct pt_regs *regs)
 {
        perf_irq(regs);
 }