* This file handles the architecture-dependent parts of hardware exceptions
*/
-#include <linux/config.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
-#include <linux/a.out.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/kprobes.h>
#include <linux/kexec.h>
+#include <linux/backlight.h>
+#include <linux/bug.h>
+#include <linux/kdebug.h>
-#include <asm/kdebug.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/firmware.h>
#include <asm/processor.h>
#endif
+#include <asm/kexec.h>
-#ifdef CONFIG_PPC64 /* XXX */
-#define _IO_BASE pci_io_base
-#endif
-
-#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);
EXPORT_SYMBOL(__debugger_fault_handler);
#endif
-struct notifier_block *powerpc_die_chain;
-static DEFINE_SPINLOCK(die_notifier_lock);
-
-int register_die_notifier(struct notifier_block *nb)
-{
- int err = 0;
- unsigned long flags;
-
- spin_lock_irqsave(&die_notifier_lock, flags);
- err = notifier_chain_register(&powerpc_die_chain, nb);
- spin_unlock_irqrestore(&die_notifier_lock, flags);
- return err;
-}
-
/*
* Trap & Exception support
*/
-static DEFINE_SPINLOCK(die_lock);
+#ifdef CONFIG_PMAC_BACKLIGHT
+static void pmac_backlight_unblank(void)
+{
+ mutex_lock(&pmac_backlight_mutex);
+ if (pmac_backlight) {
+ struct backlight_properties *props;
+
+ props = &pmac_backlight->props;
+ props->brightness = props->max_brightness;
+ props->power = FB_BLANK_UNBLANK;
+ backlight_update_status(pmac_backlight);
+ }
+ mutex_unlock(&pmac_backlight_mutex);
+}
+#else
+static inline void pmac_backlight_unblank(void) { }
+#endif
int die(const char *str, struct pt_regs *regs, long err)
{
- static int die_counter, crash_dump_start = 0;
- int nl = 0;
+ static struct {
+ spinlock_t lock;
+ u32 lock_owner;
+ int lock_owner_depth;
+ } die = {
+ .lock = __SPIN_LOCK_UNLOCKED(die.lock),
+ .lock_owner = -1,
+ .lock_owner_depth = 0
+ };
+ static int die_counter;
+ unsigned long flags;
if (debugger(regs))
return 1;
- console_verbose();
- spin_lock_irq(&die_lock);
- bust_spinlocks(1);
-#ifdef CONFIG_PMAC_BACKLIGHT
- if (_machine == _MACH_Pmac) {
- set_backlight_enable(1);
- set_backlight_level(BACKLIGHT_MAX);
+ oops_enter();
+
+ if (die.lock_owner != raw_smp_processor_id()) {
+ console_verbose();
+ spin_lock_irqsave(&die.lock, flags);
+ die.lock_owner = smp_processor_id();
+ die.lock_owner_depth = 0;
+ bust_spinlocks(1);
+ if (machine_is(powermac))
+ pmac_backlight_unblank();
+ } else {
+ local_save_flags(flags);
}
-#endif
- printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
+
+ if (++die.lock_owner_depth < 3) {
+ printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
#ifdef CONFIG_PREEMPT
- printk("PREEMPT ");
- nl = 1;
+ printk("PREEMPT ");
#endif
#ifdef CONFIG_SMP
- printk("SMP NR_CPUS=%d ", NR_CPUS);
- nl = 1;
+ printk("SMP NR_CPUS=%d ", NR_CPUS);
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
- printk("DEBUG_PAGEALLOC ");
- nl = 1;
+ printk("DEBUG_PAGEALLOC ");
#endif
#ifdef CONFIG_NUMA
- printk("NUMA ");
- nl = 1;
+ printk("NUMA ");
#endif
-#ifdef CONFIG_PPC64
- switch (_machine) {
- case PLATFORM_PSERIES:
- printk("PSERIES ");
- nl = 1;
- break;
- case PLATFORM_PSERIES_LPAR:
- printk("PSERIES LPAR ");
- nl = 1;
- break;
- case PLATFORM_ISERIES_LPAR:
- printk("ISERIES LPAR ");
- nl = 1;
- break;
- case PLATFORM_POWERMAC:
- printk("POWERMAC ");
- nl = 1;
- break;
- case PLATFORM_CELL:
- printk("CELL ");
- nl = 1;
- break;
+ printk("%s\n", ppc_md.name ? ppc_md.name : "");
+
+ print_modules();
+ show_regs(regs);
+ } else {
+ printk("Recursive die() failure, output suppressed\n");
}
-#endif
- if (nl)
- printk("\n");
- print_modules();
- show_regs(regs);
+
bust_spinlocks(0);
+ die.lock_owner = -1;
+ add_taint(TAINT_DIE);
+ spin_unlock_irqrestore(&die.lock, flags);
- if (!crash_dump_start && kexec_should_crash(current)) {
- crash_dump_start = 1;
- spin_unlock_irq(&die_lock);
+ if (kexec_should_crash(current) ||
+ kexec_sr_activated(smp_processor_id()))
crash_kexec(regs);
- /* NOTREACHED */
- }
- spin_unlock_irq(&die_lock);
- if (crash_dump_start)
- /*
- * Only for soft-reset: Other CPUs will be responded to an IPI
- * sent by first kexec CPU.
- */
- for(;;)
- ;
+ crash_kexec_secondary(regs);
if (in_interrupt())
panic("Fatal exception in interrupt");
- if (panic_on_oops) {
-#ifdef CONFIG_PPC64
- printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
- ssleep(5);
-#endif
+ if (panic_on_oops)
panic("Fatal exception");
- }
+
+ oops_exit();
do_exit(err);
return 0;
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 (current->pid == 1) {
+ if (is_global_init(current)) {
__sighandler_t handler;
spin_lock_irq(¤t->sighand->siglock);
return;
}
+#ifdef CONFIG_KEXEC
+ cpu_set(smp_processor_id(), cpus_in_sr);
+#endif
+
die("System Reset", regs, SIGABRT);
+ /*
+ * Some CPUs when released from the debugger will execute this path.
+ * These CPUs entered the debugger via a soft-reset. If the CPU was
+ * hung before entering the debugger it will return to the hung
+ * state when exiting this function. This causes a problem in
+ * kdump since the hung CPU(s) will not respond to the IPI sent
+ * from kdump. To prevent the problem we call crash_kexec_secondary()
+ * here. If a kdump had not been initiated or we exit the debugger
+ * with the "exit and recover" command (x) crash_kexec_secondary()
+ * will return after 5ms and the CPU returns to its previous state.
+ */
+ crash_kexec_secondary(regs);
+
/* Must die if the interrupt is not recoverable */
if (!(regs->msr & MSR_RI))
panic("Unrecoverable System Reset");
*/
static inline int check_io_access(struct pt_regs *regs)
{
-#ifdef CONFIG_PPC_PMAC
+#ifdef CONFIG_PPC32
unsigned long msr = regs->msr;
const struct exception_table_entry *entry;
unsigned int *nip = (unsigned int *)regs->nip;
return 1;
}
}
-#endif /* CONFIG_PPC_PMAC */
+#endif /* CONFIG_PPC32 */
return 0;
}
#ifndef CONFIG_FSL_BOOKE
#define get_mc_reason(regs) ((regs)->dsisr)
#else
-#define get_mc_reason(regs) (mfspr(SPRN_MCSR))
+#define get_mc_reason(regs) (mfspr(SPRN_MCSR) & MCSR_MASK)
#endif
#define REASON_FP ESR_FP
#define REASON_ILLEGAL (ESR_PIL | ESR_PUO)
#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)
{
-#ifdef CONFIG_PPC64
- int recover = 0;
-
- /* See if any machine dependent calls */
- if (ppc_md.machine_check_exception)
- recover = ppc_md.machine_check_exception(regs);
-
- if (recover)
- return;
-#else
unsigned long reason = get_mc_reason(regs);
- 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("Data Cache Push Parity Error\n");
if (reason & MCSR_DCPERR)
printk("Data Cache Parity Error\n");
- if (reason & MCSR_GL_CI)
- printk("Guarded Load or Cache-Inhibited stwcx.\n");
if (reason & MCSR_BUS_IAERR)
printk("Bus - Instruction Address Error\n");
if (reason & MCSR_BUS_RAERR)
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.
+ */
+ 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
*/
- platform_machine_check(regs);
-#endif /* CONFIG_PPC64 */
+ 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;
}
}
-static void parse_fpe(struct pt_regs *regs)
+static inline int __parse_fpscr(unsigned long fpscr)
{
- int code = 0;
- unsigned long fpscr;
-
- flush_fp_to_thread(current);
-
- fpscr = current->thread.fpscr.val;
+ int ret = 0;
/* Invalid operation */
if ((fpscr & FPSCR_VE) && (fpscr & FPSCR_VX))
- code = FPE_FLTINV;
+ ret = FPE_FLTINV;
/* Overflow */
else if ((fpscr & FPSCR_OE) && (fpscr & FPSCR_OX))
- code = FPE_FLTOVF;
+ ret = FPE_FLTOVF;
/* Underflow */
else if ((fpscr & FPSCR_UE) && (fpscr & FPSCR_UX))
- code = FPE_FLTUND;
+ ret = FPE_FLTUND;
/* Divide by zero */
else if ((fpscr & FPSCR_ZE) && (fpscr & FPSCR_ZX))
- code = FPE_FLTDIV;
+ ret = FPE_FLTDIV;
/* Inexact result */
else if ((fpscr & FPSCR_XE) && (fpscr & FPSCR_XX))
- code = FPE_FLTRES;
+ ret = FPE_FLTRES;
+
+ return ret;
+}
+
+static void parse_fpe(struct pt_regs *regs)
+{
+ int code = 0;
+
+ flush_fp_to_thread(current);
+
+ code = __parse_fpscr(current->thread.fpscr.val);
_exception(SIGFPE, regs, code, regs->nip);
}
#define INST_MFSPR_PVR_MASK 0xfc1fffff
#define INST_DCBA 0x7c0005ec
-#define INST_DCBA_MASK 0x7c0007fe
+#define INST_DCBA_MASK 0xfc0007fe
#define INST_MCRXR 0x7c000400
-#define INST_MCRXR_MASK 0x7c0007fe
+#define INST_MCRXR_MASK 0xfc0007fe
#define INST_STRING 0x7c00042a
-#define INST_STRING_MASK 0x7c0007fe
-#define INST_STRING_GEN_MASK 0x7c00067e
+#define INST_STRING_MASK 0xfc0007fe
+#define INST_STRING_GEN_MASK 0xfc00067e
#define INST_LSWI 0x7c0004aa
#define INST_LSWX 0x7c00042a
#define INST_STSWI 0x7c0005aa
#define INST_STSWX 0x7c00052a
+#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_popcntb_inst(struct pt_regs *regs, u32 instword)
+{
+ u32 ra,rs;
+ unsigned long tmp;
+
+ ra = (instword >> 16) & 0x1f;
+ rs = (instword >> 21) & 0x1f;
+
+ tmp = regs->gpr[rs];
+ tmp = tmp - ((tmp >> 1) & 0x5555555555555555ULL);
+ tmp = (tmp & 0x3333333333333333ULL) + ((tmp >> 2) & 0x3333333333333333ULL);
+ tmp = (tmp + (tmp >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
+ regs->gpr[ra] = tmp;
+
+ 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;
u32 rd;
- if (!user_mode(regs))
+ if (!user_mode(regs) || (regs->msr & MSR_LE))
return -EINVAL;
CHECK_FULL_REGS(regs);
if ((instword & INST_STRING_GEN_MASK) == INST_STRING)
return emulate_string_inst(regs, instword);
- return -EINVAL;
-}
-
-/*
- * Look through the list of trap instructions that are used for BUG(),
- * BUG_ON() and WARN_ON() and see if we hit one. At this point we know
- * that the exception was caused by a trap instruction of some kind.
- * Returns 1 if we should continue (i.e. it was a WARN_ON) or 0
- * otherwise.
- */
-extern struct bug_entry __start___bug_table[], __stop___bug_table[];
-
-#ifndef CONFIG_MODULES
-#define module_find_bug(x) NULL
-#endif
+ /* Emulate the popcntb (Population Count Bytes) instruction. */
+ if ((instword & INST_POPCNTB_MASK) == INST_POPCNTB) {
+ return emulate_popcntb_inst(regs, instword);
+ }
-struct bug_entry *find_bug(unsigned long bugaddr)
-{
- struct bug_entry *bug;
+ /* Emulate isel (Integer Select) instruction */
+ if ((instword & INST_ISEL_MASK) == INST_ISEL) {
+ return emulate_isel(regs, instword);
+ }
- for (bug = __start___bug_table; bug < __stop___bug_table; ++bug)
- if (bugaddr == bug->bug_addr)
- return bug;
- return module_find_bug(bugaddr);
+ return -EINVAL;
}
-static int check_bug_trap(struct pt_regs *regs)
+int is_valid_bugaddr(unsigned long addr)
{
- struct bug_entry *bug;
- unsigned long addr;
-
- if (regs->msr & MSR_PR)
- return 0; /* not in kernel */
- addr = regs->nip; /* address of trap instruction */
- if (addr < PAGE_OFFSET)
- return 0;
- bug = find_bug(regs->nip);
- if (bug == NULL)
- return 0;
- if (bug->line & BUG_WARNING_TRAP) {
- /* this is a WARN_ON rather than BUG/BUG_ON */
- printk(KERN_ERR "Badness in %s at %s:%ld\n",
- bug->function, bug->file,
- bug->line & ~BUG_WARNING_TRAP);
- dump_stack();
- return 1;
- }
- printk(KERN_CRIT "kernel BUG in %s at %s:%ld!\n",
- bug->function, bug->file, bug->line);
-
- return 0;
+ return is_kernel_addr(addr);
}
void __kprobes program_check_exception(struct pt_regs *regs)
unsigned int reason = get_reason(regs);
extern int do_mathemu(struct pt_regs *regs);
-#ifdef CONFIG_MATH_EMULATION
- /* (reason & REASON_ILLEGAL) would be the obvious thing here,
- * but there seems to be a hardware bug on the 405GP (RevD)
- * that means ESR is sometimes set incorrectly - either to
- * ESR_DST (!?) or 0. In the process of chasing this with the
- * hardware people - not sure if it can happen on any illegal
- * instruction or only on FP instructions, whether there is a
- * pattern to occurences etc. -dgibson 31/Mar/2003 */
- if (!(reason & REASON_TRAP) && do_mathemu(regs) == 0) {
- emulate_single_step(regs);
- return;
- }
-#endif /* CONFIG_MATH_EMULATION */
+ /* We can now get here via a FP Unavailable exception if the core
+ * has no FPU, in that case the reason flags will be 0 */
if (reason & REASON_FP) {
/* IEEE FP exception */
return;
if (debugger_bpt(regs))
return;
- if (check_bug_trap(regs)) {
+
+ if (!(regs->msr & MSR_PR) && /* not user-mode */
+ report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) {
regs->nip += 4;
return;
}
local_irq_enable();
+#ifdef CONFIG_MATH_EMULATION
+ /* (reason & REASON_ILLEGAL) would be the obvious thing here,
+ * but there seems to be a hardware bug on the 405GP (RevD)
+ * that means ESR is sometimes set incorrectly - either to
+ * ESR_DST (!?) or 0. In the process of chasing this with the
+ * hardware people - not sure if it can happen on any illegal
+ * instruction or only on FP instructions, whether there is a
+ * pattern to occurences etc. -dgibson 31/Mar/2003 */
+ switch (do_mathemu(regs)) {
+ case 0:
+ emulate_single_step(regs);
+ return;
+ case 1: {
+ int code = 0;
+ code = __parse_fpscr(current->thread.fpscr.val);
+ _exception(SIGFPE, regs, code, regs->nip);
+ return;
+ }
+ case -EFAULT:
+ _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
+ return;
+ }
+ /* fall through on any other errors */
+#endif /* CONFIG_MATH_EMULATION */
+
/* Try to emulate it if we should. */
if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) {
switch (emulate_instruction(regs)) {
void alignment_exception(struct pt_regs *regs)
{
- int fixed;
+ int sig, code, fixed = 0;
- fixed = fix_alignment(regs);
+ /* we don't implement logging of alignment exceptions */
+ if (!(current->thread.align_ctl & PR_UNALIGN_SIGBUS))
+ fixed = fix_alignment(regs);
if (fixed == 1) {
regs->nip += 4; /* skip over emulated instruction */
/* Operand address was bad */
if (fixed == -EFAULT) {
- if (user_mode(regs))
- _exception(SIGSEGV, regs, SEGV_ACCERR, regs->dar);
- else
- /* Search exception table */
- bad_page_fault(regs, regs->dar, SIGSEGV);
- return;
+ sig = SIGSEGV;
+ code = SEGV_ACCERR;
+ } else {
+ sig = SIGBUS;
+ code = BUS_ADRALN;
}
- _exception(SIGBUS, regs, BUS_ADRALN, regs->dar);
+ if (user_mode(regs))
+ _exception(sig, regs, code, regs->dar);
+ else
+ bad_page_fault(regs, regs->dar, sig);
}
void StackOverflow(struct pt_regs *regs)
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());
}
void altivec_unavailable_exception(struct pt_regs *regs)
{
-#if !defined(CONFIG_ALTIVEC)
if (user_mode(regs)) {
/* A user program has executed an altivec instruction,
but this kernel doesn't support altivec. */
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
return;
}
-#endif
+
printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "
"%lx at %lx\n", regs->trap, regs->nip);
die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
}
+void vsx_unavailable_exception(struct pt_regs *regs)
+{
+ if (user_mode(regs)) {
+ /* A user program has executed an vsx instruction,
+ but this kernel doesn't support vsx. */
+ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
+ return;
+ }
+
+ printk(KERN_EMERG "Unrecoverable VSX Unavailable Exception "
+ "%lx at %lx\n", regs->trap, regs->nip);
+ die("Unrecoverable VSX Unavailable Exception", regs, SIGABRT);
+}
+
void performance_monitor_exception(struct pt_regs *regs)
{
perf_irq(regs);
{
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);
#ifdef CONFIG_MATH_EMULATION
errcode = do_mathemu(regs);
-#else
+
+ switch (errcode) {
+ case 0:
+ emulate_single_step(regs);
+ return;
+ case 1: {
+ int code = 0;
+ code = __parse_fpscr(current->thread.fpscr.val);
+ _exception(SIGFPE, regs, code, regs->nip);
+ return;
+ }
+ case -EFAULT:
+ _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
+ return;
+ default:
+ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
+ return;
+ }
+
+#elif defined(CONFIG_8XX_MINIMAL_FPEMU)
errcode = Soft_emulate_8xx(regs);
-#endif
- if (errcode) {
- if (errcode > 0)
- _exception(SIGFPE, regs, 0, 0);
- else if (errcode == -EFAULT)
- _exception(SIGSEGV, regs, 0, 0);
- else
- _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
- } else
+ switch (errcode) {
+ case 0:
emulate_single_step(regs);
+ return;
+ case 1:
+ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
+ return;
+ case -EFAULT:
+ _exception(SIGSEGV, regs, SEGV_MAPERR, regs->nip);
+ return;
+ }
+#else
+ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
+#endif
}
#endif /* CONFIG_8xx */
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
-void DebugException(struct pt_regs *regs, unsigned long debug_status)
+void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status)
{
if (debug_status & DBSR_IC) { /* instruction completion */
regs->msr &= ~MSR_DE;
+
+ /* Disable instruction completion */
+ mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC);
+ /* Clear the instruction completion event */
+ mtspr(SPRN_DBSR, DBSR_IC);
+
+ if (notify_die(DIE_SSTEP, "single_step", regs, 5,
+ 5, SIGTRAP) == NOTIFY_STOP) {
+ return;
+ }
+
+ if (debugger_sstep(regs))
+ return;
+
if (user_mode(regs)) {
current->thread.dbcr0 &= ~DBCR0_IC;
+ }
+
+ _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
+ } else if (debug_status & (DBSR_DAC1R | DBSR_DAC1W)) {
+ regs->msr &= ~MSR_DE;
+
+ if (user_mode(regs)) {
+ current->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W |
+ DBCR0_IDM);
} else {
- /* Disable instruction completion */
- mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC);
- /* Clear the instruction completion event */
- mtspr(SPRN_DBSR, DBSR_IC);
- if (debugger_sstep(regs))
- return;
+ /* Disable DAC interupts */
+ mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~(DBSR_DAC1R |
+ DBSR_DAC1W | DBCR0_IDM));
+
+ /* Clear the DAC event */
+ mtspr(SPRN_DBSR, (DBSR_DAC1R | DBSR_DAC1W));
}
- _exception(SIGTRAP, regs, TRAP_TRACE, 0);
+ /* Setup and send the trap to the handler */
+ do_dabr(regs, mfspr(SPRN_DAC1), debug_status);
}
}
#endif /* CONFIG_4xx || CONFIG_BOOKE */
}
#endif /* CONFIG_ALTIVEC */
+#ifdef CONFIG_VSX
+void vsx_assist_exception(struct pt_regs *regs)
+{
+ if (!user_mode(regs)) {
+ printk(KERN_EMERG "VSX assist exception in kernel mode"
+ " at %lx\n", regs->nip);
+ die("Kernel VSX assist exception", regs, SIGILL);
+ }
+
+ flush_vsx_to_thread(current);
+ printk(KERN_INFO "VSX assist not supported at %lx\n", regs->nip);
+ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
+}
+#endif /* CONFIG_VSX */
+
#ifdef CONFIG_FSL_BOOKE
void CacheLockingException(struct pt_regs *regs, unsigned long address,
unsigned long error_code)
#ifdef CONFIG_SPE
void SPEFloatingPointException(struct pt_regs *regs)
{
+ extern int do_spe_mathemu(struct pt_regs *regs);
unsigned long spefscr;
int fpexc_mode;
int code = 0;
+ int err;
+
+ preempt_disable();
+ if (regs->msr & MSR_SPE)
+ giveup_spe(current);
+ preempt_enable();
spefscr = current->thread.spefscr;
fpexc_mode = current->thread.fpexc_mode;
- /* Hardware does not neccessarily set sticky
- * underflow/overflow/invalid flags */
if ((spefscr & SPEFSCR_FOVF) && (fpexc_mode & PR_FP_EXC_OVF)) {
code = FPE_FLTOVF;
- spefscr |= SPEFSCR_FOVFS;
}
else if ((spefscr & SPEFSCR_FUNF) && (fpexc_mode & PR_FP_EXC_UND)) {
code = FPE_FLTUND;
- spefscr |= SPEFSCR_FUNFS;
}
else if ((spefscr & SPEFSCR_FDBZ) && (fpexc_mode & PR_FP_EXC_DIV))
code = FPE_FLTDIV;
else if ((spefscr & SPEFSCR_FINV) && (fpexc_mode & PR_FP_EXC_INV)) {
code = FPE_FLTINV;
- spefscr |= SPEFSCR_FINVS;
}
else if ((spefscr & (SPEFSCR_FG | SPEFSCR_FX)) && (fpexc_mode & PR_FP_EXC_RES))
code = FPE_FLTRES;
- current->thread.spefscr = spefscr;
+ err = do_spe_mathemu(regs);
+ if (err == 0) {
+ regs->nip += 4; /* skip emulated instruction */
+ emulate_single_step(regs);
+ return;
+ }
+
+ if (err == -EFAULT) {
+ /* got an error reading the instruction */
+ _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip);
+ } else if (err == -EINVAL) {
+ /* didn't recognize the instruction */
+ printk(KERN_ERR "unrecognized spe instruction "
+ "in %s at %lx\n", current->comm, regs->nip);
+ } else {
+ _exception(SIGFPE, regs, code, regs->nip);
+ }
- _exception(SIGFPE, regs, code, regs->nip);
return;
}
+
+void SPEFloatingPointRoundException(struct pt_regs *regs)
+{
+ extern int speround_handler(struct pt_regs *regs);
+ int err;
+
+ preempt_disable();
+ if (regs->msr & MSR_SPE)
+ giveup_spe(current);
+ preempt_enable();
+
+ regs->nip -= 4;
+ err = speround_handler(regs);
+ if (err == 0) {
+ regs->nip += 4; /* skip emulated instruction */
+ emulate_single_step(regs);
+ return;
+ }
+
+ if (err == -EFAULT) {
+ /* got an error reading the instruction */
+ _exception(SIGSEGV, regs, SEGV_ACCERR, regs->nip);
+ } else if (err == -EINVAL) {
+ /* didn't recognize the instruction */
+ printk(KERN_ERR "unrecognized spe instruction "
+ "in %s at %lx\n", current->comm, regs->nip);
+ } else {
+ _exception(SIGFPE, regs, 0, regs->nip);
+ return;
+ }
+}
#endif
/*
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff