#endif
#include <asm/kexec.h>
-#ifdef CONFIG_DEBUGGER
+#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
int (*__debugger)(struct pt_regs *regs);
int (*__debugger_ipi)(struct pt_regs *regs);
int (*__debugger_bpt)(struct pt_regs *regs);
void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
{
siginfo_t info;
+ const char fmt32[] = KERN_INFO "%s[%d]: unhandled signal %d " \
+ "at %08lx nip %08lx lr %08lx code %x\n";
+ const char fmt64[] = KERN_INFO "%s[%d]: unhandled signal %d " \
+ "at %016lx nip %016lx lr %016lx code %x\n";
if (!user_mode(regs)) {
if (die("Exception in kernel mode", regs, signr))
return;
- }
+ } else if (show_unhandled_signals &&
+ unhandled_signal(current, signr) &&
+ printk_ratelimit()) {
+ printk(regs->msr & MSR_SF ? fmt64 : fmt32,
+ current->comm, current->pid, signr,
+ addr, regs->nip, regs->link, code);
+ }
memset(&info, 0, sizeof(info));
info.si_signo = signr;
* generate the same exception over and over again and we get
* nowhere. Better to kill it and let the kernel panic.
*/
- if (is_init(current)) {
+ if (is_global_init(current)) {
__sighandler_t handler;
spin_lock_irq(¤t->sighand->siglock);
#define clear_single_step(regs) ((regs)->msr &= ~MSR_SE)
#endif
-/*
- * This is "fall-back" implementation for configurations
- * which don't provide platform-specific machine check info
- */
-void __attribute__ ((weak))
-platform_machine_check(struct pt_regs *regs)
-{
-}
-
-void machine_check_exception(struct pt_regs *regs)
+#if defined(CONFIG_4xx)
+int machine_check_4xx(struct pt_regs *regs)
{
- int recover = 0;
unsigned long reason = get_mc_reason(regs);
- /* See if any machine dependent calls */
- if (ppc_md.machine_check_exception)
- recover = ppc_md.machine_check_exception(regs);
-
- if (recover)
- return;
-
- if (user_mode(regs)) {
- regs->msr |= MSR_RI;
- _exception(SIGBUS, regs, BUS_ADRERR, regs->nip);
- return;
- }
-
-#if defined(CONFIG_8xx) && defined(CONFIG_PCI)
- /* the qspan pci read routines can cause machine checks -- Cort */
- bad_page_fault(regs, regs->dar, SIGBUS);
- return;
-#endif
-
- if (debugger_fault_handler(regs)) {
- regs->msr |= MSR_RI;
- return;
- }
-
- if (check_io_access(regs))
- return;
-
-#if defined(CONFIG_4xx) && !defined(CONFIG_440A)
if (reason & ESR_IMCP) {
printk("Instruction");
mtspr(SPRN_ESR, reason & ~ESR_IMCP);
} else
printk("Data");
printk(" machine check in kernel mode.\n");
-#elif defined(CONFIG_440A)
+
+ return 0;
+}
+
+int machine_check_440A(struct pt_regs *regs)
+{
+ unsigned long reason = get_mc_reason(regs);
+
printk("Machine check in kernel mode.\n");
if (reason & ESR_IMCP){
printk("Instruction Synchronous Machine Check exception\n");
/* Clear MCSR */
mtspr(SPRN_MCSR, mcsr);
}
-#elif defined (CONFIG_E500)
+ return 0;
+}
+#elif defined(CONFIG_E500)
+int machine_check_e500(struct pt_regs *regs)
+{
+ unsigned long reason = get_mc_reason(regs);
+
printk("Machine check in kernel mode.\n");
printk("Caused by (from MCSR=%lx): ", reason);
printk("Bus - Instruction Parity Error\n");
if (reason & MCSR_BUS_RPERR)
printk("Bus - Read Parity Error\n");
-#elif defined (CONFIG_E200)
+
+ return 0;
+}
+#elif defined(CONFIG_E200)
+int machine_check_e200(struct pt_regs *regs)
+{
+ unsigned long reason = get_mc_reason(regs);
+
printk("Machine check in kernel mode.\n");
printk("Caused by (from MCSR=%lx): ", reason);
printk("Bus - Read Bus Error on data load\n");
if (reason & MCSR_BUS_WRERR)
printk("Bus - Write Bus Error on buffered store or cache line push\n");
-#else /* !CONFIG_4xx && !CONFIG_E500 && !CONFIG_E200 */
+
+ return 0;
+}
+#else
+int machine_check_generic(struct pt_regs *regs)
+{
+ unsigned long reason = get_mc_reason(regs);
+
printk("Machine check in kernel mode.\n");
printk("Caused by (from SRR1=%lx): ", reason);
switch (reason & 0x601F0000) {
default:
printk("Unknown values in msr\n");
}
-#endif /* CONFIG_4xx */
+ return 0;
+}
+#endif /* everything else */
- /*
- * Optional platform-provided routine to print out
- * additional info, e.g. bus error registers.
+void machine_check_exception(struct pt_regs *regs)
+{
+ int recover = 0;
+
+ /* See if any machine dependent calls. In theory, we would want
+ * to call the CPU first, and call the ppc_md. one if the CPU
+ * one returns a positive number. However there is existing code
+ * that assumes the board gets a first chance, so let's keep it
+ * that way for now and fix things later. --BenH.
*/
- platform_machine_check(regs);
+ if (ppc_md.machine_check_exception)
+ recover = ppc_md.machine_check_exception(regs);
+ else if (cur_cpu_spec->machine_check)
+ recover = cur_cpu_spec->machine_check(regs);
+
+ if (recover > 0)
+ return;
+
+ if (user_mode(regs)) {
+ regs->msr |= MSR_RI;
+ _exception(SIGBUS, regs, BUS_ADRERR, regs->nip);
+ return;
+ }
+
+#if defined(CONFIG_8xx) && defined(CONFIG_PCI)
+ /* the qspan pci read routines can cause machine checks -- Cort
+ *
+ * yuck !!! that totally needs to go away ! There are better ways
+ * to deal with that than having a wart in the mcheck handler.
+ * -- BenH
+ */
+ bad_page_fault(regs, regs->dar, SIGBUS);
+ return;
+#endif
+
+ if (debugger_fault_handler(regs)) {
+ regs->msr |= MSR_RI;
+ return;
+ }
+
+ if (check_io_access(regs))
+ return;
if (debugger_fault_handler(regs))
return;
#define INST_POPCNTB 0x7c0000f4
#define INST_POPCNTB_MASK 0xfc0007fe
+#define INST_ISEL 0x7c00001e
+#define INST_ISEL_MASK 0xfc00003e
+
static int emulate_string_inst(struct pt_regs *regs, u32 instword)
{
u8 rT = (instword >> 21) & 0x1f;
return 0;
}
+static int emulate_isel(struct pt_regs *regs, u32 instword)
+{
+ u8 rT = (instword >> 21) & 0x1f;
+ u8 rA = (instword >> 16) & 0x1f;
+ u8 rB = (instword >> 11) & 0x1f;
+ u8 BC = (instword >> 6) & 0x1f;
+ u8 bit;
+ unsigned long tmp;
+
+ tmp = (rA == 0) ? 0 : regs->gpr[rA];
+ bit = (regs->ccr >> (31 - BC)) & 0x1;
+
+ regs->gpr[rT] = bit ? tmp : regs->gpr[rB];
+
+ return 0;
+}
+
static int emulate_instruction(struct pt_regs *regs)
{
u32 instword;
return emulate_popcntb_inst(regs, instword);
}
+ /* Emulate isel (Integer Select) instruction */
+ if ((instword & INST_ISEL_MASK) == INST_ISEL) {
+ return emulate_isel(regs, instword);
+ }
+
return -EINVAL;
}
void trace_syscall(struct pt_regs *regs)
{
printk("Task: %p(%d), PC: %08lX/%08lX, Syscall: %3ld, Result: %s%ld %s\n",
- current, current->pid, regs->nip, regs->link, regs->gpr[0],
+ current, task_pid_nr(current), regs->nip, regs->link, regs->gpr[0],
regs->ccr&0x10000000?"Error=":"", regs->gpr[3], print_tainted());
}
{
extern int do_mathemu(struct pt_regs *);
extern int Soft_emulate_8xx(struct pt_regs *);
+#if defined(CONFIG_MATH_EMULATION) || defined(CONFIG_8XX_MINIMAL_FPEMU)
int errcode;
+#endif
CHECK_FULL_REGS(regs);
return;
}
-#else
+#elif defined(CONFIG_8XX_MINIMAL_FPEMU)
errcode = Soft_emulate_8xx(regs);
switch (errcode) {
case 0:
_exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
return;
}
+#else
+ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
#endif
}
#endif /* CONFIG_8xx */
projects / linux-2.6 / blobdiff