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Diffstat (limited to 'arch/powerpc/kernel/traps.c')
-rw-r--r--arch/powerpc/kernel/traps.c176
1 files changed, 140 insertions, 36 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index d069ff8a7e0..3031fc712ad 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -21,7 +21,6 @@
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
-#include <linux/slab.h>
#include <linux/user.h>
#include <linux/interrupt.h>
#include <linux/init.h>
@@ -60,13 +59,13 @@
#endif
#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);
-int (*__debugger_sstep)(struct pt_regs *regs);
-int (*__debugger_iabr_match)(struct pt_regs *regs);
-int (*__debugger_dabr_match)(struct pt_regs *regs);
-int (*__debugger_fault_handler)(struct pt_regs *regs);
+int (*__debugger)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_ipi)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_bpt)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_sstep)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_iabr_match)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_dabr_match)(struct pt_regs *regs) __read_mostly;
+int (*__debugger_fault_handler)(struct pt_regs *regs) __read_mostly;
EXPORT_SYMBOL(__debugger);
EXPORT_SYMBOL(__debugger_ipi);
@@ -102,11 +101,11 @@ static inline void pmac_backlight_unblank(void) { }
int die(const char *str, struct pt_regs *regs, long err)
{
static struct {
- spinlock_t lock;
+ raw_spinlock_t lock;
u32 lock_owner;
int lock_owner_depth;
} die = {
- .lock = __SPIN_LOCK_UNLOCKED(die.lock),
+ .lock = __RAW_SPIN_LOCK_UNLOCKED(die.lock),
.lock_owner = -1,
.lock_owner_depth = 0
};
@@ -120,7 +119,7 @@ int die(const char *str, struct pt_regs *regs, long err)
if (die.lock_owner != raw_smp_processor_id()) {
console_verbose();
- spin_lock_irqsave(&die.lock, flags);
+ raw_spin_lock_irqsave(&die.lock, flags);
die.lock_owner = smp_processor_id();
die.lock_owner_depth = 0;
bust_spinlocks(1);
@@ -146,6 +145,11 @@ int die(const char *str, struct pt_regs *regs, long err)
#endif
printk("%s\n", ppc_md.name ? ppc_md.name : "");
+ sysfs_printk_last_file();
+ if (notify_die(DIE_OOPS, str, regs, err, 255,
+ SIGSEGV) == NOTIFY_STOP)
+ return 1;
+
print_modules();
show_regs(regs);
} else {
@@ -155,7 +159,7 @@ int die(const char *str, struct pt_regs *regs, long err)
bust_spinlocks(0);
die.lock_owner = -1;
add_taint(TAINT_DIE);
- spin_unlock_irqrestore(&die.lock, flags);
+ raw_spin_unlock_irqrestore(&die.lock, flags);
if (kexec_should_crash(current) ||
kexec_sr_activated(smp_processor_id()))
@@ -294,7 +298,7 @@ static inline int check_io_access(struct pt_regs *regs)
return 0;
}
-#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
/* On 4xx, the reason for the machine check or program exception
is in the ESR. */
#define get_reason(regs) ((regs)->dsisr)
@@ -376,6 +380,46 @@ int machine_check_440A(struct pt_regs *regs)
}
return 0;
}
+
+int machine_check_47x(struct pt_regs *regs)
+{
+ unsigned long reason = get_mc_reason(regs);
+ u32 mcsr;
+
+ printk(KERN_ERR "Machine check in kernel mode.\n");
+ if (reason & ESR_IMCP) {
+ printk(KERN_ERR
+ "Instruction Synchronous Machine Check exception\n");
+ mtspr(SPRN_ESR, reason & ~ESR_IMCP);
+ return 0;
+ }
+ mcsr = mfspr(SPRN_MCSR);
+ if (mcsr & MCSR_IB)
+ printk(KERN_ERR "Instruction Read PLB Error\n");
+ if (mcsr & MCSR_DRB)
+ printk(KERN_ERR "Data Read PLB Error\n");
+ if (mcsr & MCSR_DWB)
+ printk(KERN_ERR "Data Write PLB Error\n");
+ if (mcsr & MCSR_TLBP)
+ printk(KERN_ERR "TLB Parity Error\n");
+ if (mcsr & MCSR_ICP) {
+ flush_instruction_cache();
+ printk(KERN_ERR "I-Cache Parity Error\n");
+ }
+ if (mcsr & MCSR_DCSP)
+ printk(KERN_ERR "D-Cache Search Parity Error\n");
+ if (mcsr & PPC47x_MCSR_GPR)
+ printk(KERN_ERR "GPR Parity Error\n");
+ if (mcsr & PPC47x_MCSR_FPR)
+ printk(KERN_ERR "FPR Parity Error\n");
+ if (mcsr & PPC47x_MCSR_IPR)
+ printk(KERN_ERR "Machine Check exception is imprecise\n");
+
+ /* Clear MCSR */
+ mtspr(SPRN_MCSR, mcsr);
+
+ return 0;
+}
#elif defined(CONFIG_E500)
int machine_check_e500(struct pt_regs *regs)
{
@@ -478,6 +522,8 @@ void machine_check_exception(struct pt_regs *regs)
{
int recover = 0;
+ __get_cpu_var(irq_stat).mce_exceptions++;
+
/* 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
@@ -809,12 +855,15 @@ void __kprobes program_check_exception(struct pt_regs *regs)
return;
}
if (reason & REASON_TRAP) {
+ /* Debugger is first in line to stop recursive faults in
+ * rcu_lock, notify_die, or atomic_notifier_call_chain */
+ if (debugger_bpt(regs))
+ return;
+
/* trap exception */
if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP)
== NOTIFY_STOP)
return;
- if (debugger_bpt(regs))
- return;
if (!(regs->msr & MSR_PR) && /* not user-mode */
report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) {
@@ -960,6 +1009,8 @@ void vsx_unavailable_exception(struct pt_regs *regs)
void performance_monitor_exception(struct pt_regs *regs)
{
+ __get_cpu_var(irq_stat).pmu_irqs++;
+
perf_irq(regs);
}
@@ -1024,10 +1075,69 @@ void SoftwareEmulation(struct pt_regs *regs)
}
#endif /* CONFIG_8xx */
-#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
+static void handle_debug(struct pt_regs *regs, unsigned long debug_status)
+{
+ int changed = 0;
+ /*
+ * Determine the cause of the debug event, clear the
+ * event flags and send a trap to the handler. Torez
+ */
+ if (debug_status & (DBSR_DAC1R | DBSR_DAC1W)) {
+ dbcr_dac(current) &= ~(DBCR_DAC1R | DBCR_DAC1W);
+#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
+ current->thread.dbcr2 &= ~DBCR2_DAC12MODE;
+#endif
+ do_send_trap(regs, mfspr(SPRN_DAC1), debug_status, TRAP_HWBKPT,
+ 5);
+ changed |= 0x01;
+ } else if (debug_status & (DBSR_DAC2R | DBSR_DAC2W)) {
+ dbcr_dac(current) &= ~(DBCR_DAC2R | DBCR_DAC2W);
+ do_send_trap(regs, mfspr(SPRN_DAC2), debug_status, TRAP_HWBKPT,
+ 6);
+ changed |= 0x01;
+ } else if (debug_status & DBSR_IAC1) {
+ current->thread.dbcr0 &= ~DBCR0_IAC1;
+ dbcr_iac_range(current) &= ~DBCR_IAC12MODE;
+ do_send_trap(regs, mfspr(SPRN_IAC1), debug_status, TRAP_HWBKPT,
+ 1);
+ changed |= 0x01;
+ } else if (debug_status & DBSR_IAC2) {
+ current->thread.dbcr0 &= ~DBCR0_IAC2;
+ do_send_trap(regs, mfspr(SPRN_IAC2), debug_status, TRAP_HWBKPT,
+ 2);
+ changed |= 0x01;
+ } else if (debug_status & DBSR_IAC3) {
+ current->thread.dbcr0 &= ~DBCR0_IAC3;
+ dbcr_iac_range(current) &= ~DBCR_IAC34MODE;
+ do_send_trap(regs, mfspr(SPRN_IAC3), debug_status, TRAP_HWBKPT,
+ 3);
+ changed |= 0x01;
+ } else if (debug_status & DBSR_IAC4) {
+ current->thread.dbcr0 &= ~DBCR0_IAC4;
+ do_send_trap(regs, mfspr(SPRN_IAC4), debug_status, TRAP_HWBKPT,
+ 4);
+ changed |= 0x01;
+ }
+ /*
+ * At the point this routine was called, the MSR(DE) was turned off.
+ * Check all other debug flags and see if that bit needs to be turned
+ * back on or not.
+ */
+ if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0, current->thread.dbcr1))
+ regs->msr |= MSR_DE;
+ else
+ /* Make sure the IDM flag is off */
+ current->thread.dbcr0 &= ~DBCR0_IDM;
+
+ if (changed & 0x01)
+ mtspr(SPRN_DBCR0, current->thread.dbcr0);
+}
void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status)
{
+ current->thread.dbsr = debug_status;
+
/* Hack alert: On BookE, Branch Taken stops on the branch itself, while
* on server, it stops on the target of the branch. In order to simulate
* the server behaviour, we thus restart right away with a single step
@@ -1071,29 +1181,23 @@ void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status)
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 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));
+ current->thread.dbcr0 &= ~DBCR0_IC;
+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
+ if (DBCR_ACTIVE_EVENTS(current->thread.dbcr0,
+ current->thread.dbcr1))
+ regs->msr |= MSR_DE;
+ else
+ /* Make sure the IDM bit is off */
+ current->thread.dbcr0 &= ~DBCR0_IDM;
+#endif
}
- /* Setup and send the trap to the handler */
- do_dabr(regs, mfspr(SPRN_DAC1), debug_status);
- }
+
+ _exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
+ } else
+ handle_debug(regs, debug_status);
}
-#endif /* CONFIG_4xx || CONFIG_BOOKE */
+#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
#if !defined(CONFIG_TAU_INT)
void TAUException(struct pt_regs *regs)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-04-15 23:38:30 +0000