diff options
Diffstat (limited to 'arch/mips/kernel/traps.c')
-rw-r--r-- | arch/mips/kernel/traps.c | 83 |
1 files changed, 58 insertions, 25 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 852780868fb4..8e9fbe75894e 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -25,8 +25,11 @@ #include <linux/ptrace.h> #include <linux/kgdb.h> #include <linux/kdebug.h> +#include <linux/kprobes.h> #include <linux/notifier.h> #include <linux/kdb.h> +#include <linux/irq.h> +#include <linux/perf_event.h> #include <asm/bootinfo.h> #include <asm/branch.h> @@ -50,7 +53,6 @@ #include <asm/mmu_context.h> #include <asm/types.h> #include <asm/stacktrace.h> -#include <asm/irq.h> #include <asm/uasm.h> extern void check_wait(void); @@ -334,7 +336,7 @@ void show_regs(struct pt_regs *regs) __show_regs((struct pt_regs *)regs); } -void show_registers(const struct pt_regs *regs) +void show_registers(struct pt_regs *regs) { const int field = 2 * sizeof(unsigned long); @@ -356,9 +358,14 @@ void show_registers(const struct pt_regs *regs) printk("\n"); } +static int regs_to_trapnr(struct pt_regs *regs) +{ + return (regs->cp0_cause >> 2) & 0x1f; +} + static DEFINE_SPINLOCK(die_lock); -void __noreturn die(const char * str, struct pt_regs * regs) +void __noreturn die(const char *str, struct pt_regs *regs) { static int die_counter; int sig = SIGSEGV; @@ -366,7 +373,7 @@ void __noreturn die(const char * str, struct pt_regs * regs) unsigned long dvpret = dvpe(); #endif /* CONFIG_MIPS_MT_SMTC */ - notify_die(DIE_OOPS, str, (struct pt_regs *)regs, SIGSEGV, 0, 0); + notify_die(DIE_OOPS, str, regs, 0, regs_to_trapnr(regs), SIGSEGV); console_verbose(); spin_lock_irq(&die_lock); @@ -375,7 +382,7 @@ void __noreturn die(const char * str, struct pt_regs * regs) mips_mt_regdump(dvpret); #endif /* CONFIG_MIPS_MT_SMTC */ - if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_no, SIGSEGV) == NOTIFY_STOP) + if (notify_die(DIE_OOPS, str, regs, 0, regs_to_trapnr(regs), SIGSEGV) == NOTIFY_STOP) sig = 0; printk("%s[#%d]:\n", str, ++die_counter); @@ -449,7 +456,7 @@ asmlinkage void do_be(struct pt_regs *regs) printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n", data ? "Data" : "Instruction", field, regs->cp0_epc, field, regs->regs[31]); - if (notify_die(DIE_OOPS, "bus error", regs, SIGBUS, 0, 0) + if (notify_die(DIE_OOPS, "bus error", regs, 0, regs_to_trapnr(regs), SIGBUS) == NOTIFY_STOP) return; @@ -570,10 +577,16 @@ static inline int simulate_sc(struct pt_regs *regs, unsigned int opcode) */ static int simulate_llsc(struct pt_regs *regs, unsigned int opcode) { - if ((opcode & OPCODE) == LL) + if ((opcode & OPCODE) == LL) { + perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, + 1, 0, regs, 0); return simulate_ll(regs, opcode); - if ((opcode & OPCODE) == SC) + } + if ((opcode & OPCODE) == SC) { + perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, + 1, 0, regs, 0); return simulate_sc(regs, opcode); + } return -1; /* Must be something else ... */ } @@ -589,6 +602,8 @@ static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode) if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) { int rd = (opcode & RD) >> 11; int rt = (opcode & RT) >> 16; + perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, + 1, 0, regs, 0); switch (rd) { case 0: /* CPU number */ regs->regs[rt] = smp_processor_id(); @@ -624,8 +639,11 @@ static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode) static int simulate_sync(struct pt_regs *regs, unsigned int opcode) { - if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC) + if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC) { + perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, + 1, 0, regs, 0); return 0; + } return -1; /* Must be something else ... */ } @@ -650,7 +668,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) { siginfo_t info; - if (notify_die(DIE_FP, "FP exception", regs, SIGFPE, 0, 0) + if (notify_die(DIE_FP, "FP exception", regs, 0, regs_to_trapnr(regs), SIGFPE) == NOTIFY_STOP) return; die_if_kernel("FP exception in kernel code", regs); @@ -713,11 +731,11 @@ static void do_trap_or_bp(struct pt_regs *regs, unsigned int code, char b[40]; #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP - if (kgdb_ll_trap(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP) + if (kgdb_ll_trap(DIE_TRAP, str, regs, code, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) return; #endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */ - if (notify_die(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP) + if (notify_die(DIE_TRAP, str, regs, code, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) return; /* @@ -783,6 +801,25 @@ asmlinkage void do_bp(struct pt_regs *regs) if (bcode >= (1 << 10)) bcode >>= 10; + /* + * notify the kprobe handlers, if instruction is likely to + * pertain to them. + */ + switch (bcode) { + case BRK_KPROBE_BP: + if (notify_die(DIE_BREAK, "debug", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) + return; + else + break; + case BRK_KPROBE_SSTEPBP: + if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) + return; + else + break; + default: + break; + } + do_trap_or_bp(regs, bcode, "Break"); return; @@ -815,7 +852,7 @@ asmlinkage void do_ri(struct pt_regs *regs) unsigned int opcode = 0; int status = -1; - if (notify_die(DIE_RI, "RI Fault", regs, SIGSEGV, 0, 0) + if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs), SIGILL) == NOTIFY_STOP) return; @@ -907,11 +944,6 @@ static int default_cu2_call(struct notifier_block *nfb, unsigned long action, return NOTIFY_OK; } -static struct notifier_block default_cu2_notifier = { - .notifier_call = default_cu2_call, - .priority = 0x80000000, /* Run last */ -}; - asmlinkage void do_cpu(struct pt_regs *regs) { unsigned int __user *epc; @@ -1449,6 +1481,7 @@ void __cpuinit per_cpu_trap_init(void) { unsigned int cpu = smp_processor_id(); unsigned int status_set = ST0_CU0; + unsigned int hwrena = cpu_hwrena_impl_bits; #ifdef CONFIG_MIPS_MT_SMTC int secondaryTC = 0; int bootTC = (cpu == 0); @@ -1481,14 +1514,14 @@ void __cpuinit per_cpu_trap_init(void) change_c0_status(ST0_CU|ST0_MX|ST0_RE|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX, status_set); - if (cpu_has_mips_r2) { - unsigned int enable = 0x0000000f | cpu_hwrena_impl_bits; + if (cpu_has_mips_r2) + hwrena |= 0x0000000f; - if (!noulri && cpu_has_userlocal) - enable |= (1 << 29); + if (!noulri && cpu_has_userlocal) + hwrena |= (1 << 29); - write_c0_hwrena(enable); - } + if (hwrena) + write_c0_hwrena(hwrena); #ifdef CONFIG_MIPS_MT_SMTC if (!secondaryTC) { @@ -1734,5 +1767,5 @@ void __init trap_init(void) sort_extable(__start___dbe_table, __stop___dbe_table); - register_cu2_notifier(&default_cu2_notifier); + cu2_notifier(default_cu2_call, 0x80000000); /* Run last */ } |