X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fmips%2Fkernel%2Ftraps.c;h=6775a341d364ce34303fcbf501c3ee9e50c46d21;hb=refs%2Fheads%2Fvserver;hp=a7564b08eb4da273c3252d64cd46f8daf00a45d9;hpb=43bc926fffd92024b46cafaf7350d669ba9ca884;p=linux-2.6.git diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index a7564b08e..6775a341d 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -11,7 +11,6 @@ * Copyright (C) 2000, 01 MIPS Technologies, Inc. * Copyright (C) 2002, 2003, 2004, 2005 Maciej W. Rozycki */ -#include #include #include #include @@ -21,6 +20,7 @@ #include #include #include +#include #include #include @@ -41,6 +41,7 @@ #include #include #include +#include extern asmlinkage void handle_int(void); extern asmlinkage void handle_tlbm(void); @@ -53,6 +54,8 @@ extern asmlinkage void handle_dbe(void); extern asmlinkage void handle_sys(void); extern asmlinkage void handle_bp(void); extern asmlinkage void handle_ri(void); +extern asmlinkage void handle_ri_rdhwr_vivt(void); +extern asmlinkage void handle_ri_rdhwr(void); extern asmlinkage void handle_cpu(void); extern asmlinkage void handle_ov(void); extern asmlinkage void handle_tr(void); @@ -65,7 +68,7 @@ extern asmlinkage void handle_mcheck(void); extern asmlinkage void handle_reserved(void); extern int fpu_emulator_cop1Handler(struct pt_regs *xcp, - struct mips_fpu_soft_struct *ctx); + struct mips_fpu_struct *ctx, int has_fpu); void (*board_be_init)(void); int (*board_be_handler)(struct pt_regs *regs, int is_fixup); @@ -73,28 +76,62 @@ void (*board_nmi_handler_setup)(void); void (*board_ejtag_handler_setup)(void); void (*board_bind_eic_interrupt)(int irq, int regset); -/* - * These constant is for searching for possible module text segments. - * MODULE_RANGE is a guess of how much space is likely to be vmalloced. - */ -#define MODULE_RANGE (8*1024*1024) + +static void show_raw_backtrace(unsigned long reg29) +{ + unsigned long *sp = (unsigned long *)reg29; + unsigned long addr; + + printk("Call Trace:"); +#ifdef CONFIG_KALLSYMS + printk("\n"); +#endif + while (!kstack_end(sp)) { + addr = *sp++; + if (__kernel_text_address(addr)) + print_ip_sym(addr); + } + printk("\n"); +} + +#ifdef CONFIG_KALLSYMS +int raw_show_trace; +static int __init set_raw_show_trace(char *str) +{ + raw_show_trace = 1; + return 1; +} +__setup("raw_show_trace", set_raw_show_trace); +#endif + +static void show_backtrace(struct task_struct *task, struct pt_regs *regs) +{ + unsigned long sp = regs->regs[29]; + unsigned long ra = regs->regs[31]; + unsigned long pc = regs->cp0_epc; + + if (raw_show_trace || !__kernel_text_address(pc)) { + show_raw_backtrace(sp); + return; + } + printk("Call Trace:\n"); + do { + print_ip_sym(pc); + pc = unwind_stack(task, &sp, pc, &ra); + } while (pc); + printk("\n"); +} /* * This routine abuses get_user()/put_user() to reference pointers * with at least a bit of error checking ... */ -void show_stack(struct task_struct *task, unsigned long *sp) +static void show_stacktrace(struct task_struct *task, struct pt_regs *regs) { const int field = 2 * sizeof(unsigned long); long stackdata; int i; - - if (!sp) { - if (task && task != current) - sp = (unsigned long *) task->thread.reg29; - else - sp = (unsigned long *) &sp; - } + unsigned long *sp = (unsigned long *)regs->regs[29]; printk("Stack :"); i = 0; @@ -115,32 +152,26 @@ void show_stack(struct task_struct *task, unsigned long *sp) i++; } printk("\n"); + show_backtrace(task, regs); } -void show_trace(struct task_struct *task, unsigned long *stack) +void show_stack(struct task_struct *task, unsigned long *sp) { - const int field = 2 * sizeof(unsigned long); - unsigned long addr; - - if (!stack) { - if (task && task != current) - stack = (unsigned long *) task->thread.reg29; - else - stack = (unsigned long *) &stack; - } - - printk("Call Trace:"); -#ifdef CONFIG_KALLSYMS - printk("\n"); -#endif - while (!kstack_end(stack)) { - addr = *stack++; - if (__kernel_text_address(addr)) { - printk(" [<%0*lx>] ", field, addr); - print_symbol("%s\n", addr); + struct pt_regs regs; + if (sp) { + regs.regs[29] = (unsigned long)sp; + regs.regs[31] = 0; + regs.cp0_epc = 0; + } else { + if (task && task != current) { + regs.regs[29] = task->thread.reg29; + regs.regs[31] = 0; + regs.cp0_epc = task->thread.reg31; + } else { + prepare_frametrace(®s); } } - printk("\n"); + show_stacktrace(task, ®s); } /* @@ -148,9 +179,10 @@ void show_trace(struct task_struct *task, unsigned long *stack) */ void dump_stack(void) { - unsigned long stack; + struct pt_regs regs; - show_trace(current, &stack); + prepare_frametrace(®s); + show_backtrace(current, ®s); } EXPORT_SYMBOL(dump_stack); @@ -267,10 +299,10 @@ void show_registers(struct pt_regs *regs) { show_regs(regs); print_modules(); - printk("Process %s (pid: %d, threadinfo=%p, task=%p)\n", - current->comm, current->pid, current_thread_info(), current); - show_stack(current, (long *) regs->regs[29]); - show_trace(current, (long *) regs->regs[29]); + printk("Process %s (pid: %d:#%u, threadinfo=%p, task=%p)\n", + current->comm, current->pid, current->xid, + current_thread_info(), current); + show_stacktrace(current, regs); show_code((unsigned int *) regs->cp0_epc); printk("\n"); } @@ -293,6 +325,16 @@ NORET_TYPE void ATTRIB_NORET die(const char * str, struct pt_regs * regs) printk("%s[#%d]:\n", str, ++die_counter); show_registers(regs); spin_unlock_irq(&die_lock); + + if (in_interrupt()) + panic("Fatal exception in interrupt"); + + if (panic_on_oops) { + printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n"); + ssleep(5); + panic("Fatal exception"); + } + do_exit(SIGSEGV); } @@ -358,19 +400,6 @@ asmlinkage void do_be(struct pt_regs *regs) force_sig(SIGBUS, current); } -static inline int get_insn_opcode(struct pt_regs *regs, unsigned int *opcode) -{ - unsigned int __user *epc; - - epc = (unsigned int __user *) regs->cp0_epc + - ((regs->cp0_cause & CAUSEF_BD) != 0); - if (!get_user(*opcode, epc)) - return 0; - - force_sig(SIGSEGV, current); - return 1; -} - /* * ll/sc emulation */ @@ -505,8 +534,8 @@ static inline int simulate_llsc(struct pt_regs *regs) { unsigned int opcode; - if (unlikely(get_insn_opcode(regs, &opcode))) - return -EFAULT; + if (get_user(opcode, (unsigned int __user *) exception_epc(regs))) + goto out_sigsegv; if ((opcode & OPCODE) == LL) { simulate_ll(regs, opcode); @@ -518,6 +547,10 @@ static inline int simulate_llsc(struct pt_regs *regs) } return -EFAULT; /* Strange things going on ... */ + +out_sigsegv: + force_sig(SIGSEGV, current); + return -EFAULT; } /* @@ -530,8 +563,8 @@ static inline int simulate_rdhwr(struct pt_regs *regs) struct thread_info *ti = task_thread_info(current); unsigned int opcode; - if (unlikely(get_insn_opcode(regs, &opcode))) - return -EFAULT; + if (get_user(opcode, (unsigned int __user *) exception_epc(regs))) + goto out_sigsegv; if (unlikely(compute_return_epc(regs))) return -EFAULT; @@ -550,6 +583,10 @@ static inline int simulate_rdhwr(struct pt_regs *regs) /* Not ours. */ return -EFAULT; + +out_sigsegv: + force_sig(SIGSEGV, current); + return -EFAULT; } asmlinkage void do_ov(struct pt_regs *regs) @@ -570,6 +607,8 @@ asmlinkage void do_ov(struct pt_regs *regs) */ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) { + die_if_kernel("FP exception in kernel code", regs); + if (fcr31 & FPU_CSR_UNI_X) { int sig; @@ -600,8 +639,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) preempt_enable(); /* Run the emulator */ - sig = fpu_emulator_cop1Handler (regs, - ¤t->thread.fpu.soft); + sig = fpu_emulator_cop1Handler (regs, ¤t->thread.fpu, 1); preempt_disable(); @@ -610,7 +648,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) * We can't allow the emulated instruction to leave any of * the cause bit set in $fcr31. */ - current->thread.fpu.soft.fcr31 &= ~FPU_CSR_ALL_X; + current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X; /* Restore the hardware register state */ restore_fp(current); @@ -632,10 +670,8 @@ asmlinkage void do_bp(struct pt_regs *regs) unsigned int opcode, bcode; siginfo_t info; - die_if_kernel("Break instruction in kernel code", regs); - - if (get_insn_opcode(regs, &opcode)) - return; + if (get_user(opcode, (unsigned int __user *) exception_epc(regs))) + goto out_sigsegv; /* * There is the ancient bug in the MIPS assemblers that the break @@ -656,6 +692,7 @@ asmlinkage void do_bp(struct pt_regs *regs) switch (bcode) { case BRK_OVERFLOW << 10: case BRK_DIVZERO << 10: + die_if_kernel("Break instruction in kernel code", regs); if (bcode == (BRK_DIVZERO << 10)) info.si_code = FPE_INTDIV; else @@ -665,9 +702,16 @@ asmlinkage void do_bp(struct pt_regs *regs) info.si_addr = (void __user *) regs->cp0_epc; force_sig_info(SIGFPE, &info, current); break; + case BRK_BUG: + die("Kernel bug detected", regs); + break; default: + die_if_kernel("Break instruction in kernel code", regs); force_sig(SIGTRAP, current); } + +out_sigsegv: + force_sig(SIGSEGV, current); } asmlinkage void do_tr(struct pt_regs *regs) @@ -675,10 +719,8 @@ asmlinkage void do_tr(struct pt_regs *regs) unsigned int opcode, tcode = 0; siginfo_t info; - die_if_kernel("Trap instruction in kernel code", regs); - - if (get_insn_opcode(regs, &opcode)) - return; + if (get_user(opcode, (unsigned int __user *) exception_epc(regs))) + goto out_sigsegv; /* Immediate versions don't provide a code. */ if (!(opcode & OPCODE)) @@ -693,6 +735,7 @@ asmlinkage void do_tr(struct pt_regs *regs) switch (tcode) { case BRK_OVERFLOW: case BRK_DIVZERO: + die_if_kernel("Trap instruction in kernel code", regs); if (tcode == BRK_DIVZERO) info.si_code = FPE_INTDIV; else @@ -702,9 +745,16 @@ asmlinkage void do_tr(struct pt_regs *regs) info.si_addr = (void __user *) regs->cp0_epc; force_sig_info(SIGFPE, &info, current); break; + case BRK_BUG: + die("Kernel bug detected", regs); + break; default: + die_if_kernel("Trap instruction in kernel code", regs); force_sig(SIGTRAP, current); } + +out_sigsegv: + force_sig(SIGSEGV, current); } asmlinkage void do_ri(struct pt_regs *regs) @@ -751,11 +801,13 @@ asmlinkage void do_cpu(struct pt_regs *regs) set_used_math(); } - preempt_enable(); - - if (!cpu_has_fpu) { - int sig = fpu_emulator_cop1Handler(regs, - ¤t->thread.fpu.soft); + if (cpu_has_fpu) { + preempt_enable(); + } else { + int sig; + preempt_enable(); + sig = fpu_emulator_cop1Handler(regs, + ¤t->thread.fpu, 0); if (sig) force_sig(sig, current); #ifdef CONFIG_MIPS_MT_FPAFF @@ -849,31 +901,29 @@ asmlinkage void do_mt(struct pt_regs *regs) { int subcode; - die_if_kernel("MIPS MT Thread exception in kernel", regs); - subcode = (read_vpe_c0_vpecontrol() & VPECONTROL_EXCPT) >> VPECONTROL_EXCPT_SHIFT; switch (subcode) { case 0: - printk(KERN_ERR "Thread Underflow\n"); + printk(KERN_DEBUG "Thread Underflow\n"); break; case 1: - printk(KERN_ERR "Thread Overflow\n"); + printk(KERN_DEBUG "Thread Overflow\n"); break; case 2: - printk(KERN_ERR "Invalid YIELD Qualifier\n"); + printk(KERN_DEBUG "Invalid YIELD Qualifier\n"); break; case 3: - printk(KERN_ERR "Gating Storage Exception\n"); + printk(KERN_DEBUG "Gating Storage Exception\n"); break; case 4: - printk(KERN_ERR "YIELD Scheduler Exception\n"); + printk(KERN_DEBUG "YIELD Scheduler Exception\n"); break; case 5: - printk(KERN_ERR "Gating Storage Schedulier Exception\n"); + printk(KERN_DEBUG "Gating Storage Schedulier Exception\n"); break; default: - printk(KERN_ERR "*** UNKNOWN THREAD EXCEPTION %d ***\n", + printk(KERN_DEBUG "*** UNKNOWN THREAD EXCEPTION %d ***\n", subcode); break; } @@ -982,10 +1032,10 @@ void ejtag_exception_handler(struct pt_regs *regs) unsigned long depc, old_epc; unsigned int debug; - printk("SDBBP EJTAG debug exception - not handled yet, just ignored!\n"); + printk(KERN_DEBUG "SDBBP EJTAG debug exception - not handled yet, just ignored!\n"); depc = read_c0_depc(); debug = read_c0_debug(); - printk("c0_depc = %0*lx, DEBUG = %08x\n", field, depc, debug); + printk(KERN_DEBUG "c0_depc = %0*lx, DEBUG = %08x\n", field, depc, debug); if (debug & 0x80000000) { /* * In branch delay slot. @@ -1003,7 +1053,7 @@ void ejtag_exception_handler(struct pt_regs *regs) write_c0_depc(depc); #if 0 - printk("\n\n----- Enable EJTAG single stepping ----\n\n"); + printk(KERN_DEBUG "\n\n----- Enable EJTAG single stepping ----\n\n"); write_c0_debug(debug | 0x100); #endif } @@ -1051,7 +1101,7 @@ void *set_except_vector(int n, void *addr) return (void *)old_handler; } -#ifdef CONFIG_CPU_MIPSR2 +#ifdef CONFIG_CPU_MIPSR2_SRS /* * MIPSR2 shadow register set allocation * FIXME: SMP... @@ -1070,11 +1120,9 @@ static struct shadow_registers { static void mips_srs_init(void) { -#ifdef CONFIG_CPU_MIPSR2_SRS shadow_registers.sr_supported = ((read_c0_srsctl() >> 26) & 0x0f) + 1; - printk(KERN_INFO "%d MIPSR2 register sets available\n", + printk(KERN_INFO "%ld MIPSR2 register sets available\n", shadow_registers.sr_supported); -#endif shadow_registers.sr_allocated = 1; /* Set 0 used by kernel */ } @@ -1199,7 +1247,14 @@ void *set_vi_handler(int n, void *addr) { return set_vi_srs_handler(n, addr, 0); } -#endif + +#else + +static inline void mips_srs_init(void) +{ +} + +#endif /* CONFIG_CPU_MIPSR2_SRS */ /* * This is used by native signal handling @@ -1378,6 +1433,15 @@ void __init set_uncached_handler (unsigned long offset, void *addr, unsigned lon memcpy((void *)(uncached_ebase + offset), addr, size); } +static int __initdata rdhwr_noopt; +static int __init set_rdhwr_noopt(char *str) +{ + rdhwr_noopt = 1; + return 1; +} + +__setup("rdhwr_noopt", set_rdhwr_noopt); + void __init trap_init(void) { extern char except_vec3_generic, except_vec3_r4000; @@ -1389,9 +1453,7 @@ void __init trap_init(void) else ebase = CAC_BASE; -#ifdef CONFIG_CPU_MIPSR2 mips_srs_init(); -#endif per_cpu_trap_init(); @@ -1459,7 +1521,9 @@ void __init trap_init(void) set_except_vector(8, handle_sys); set_except_vector(9, handle_bp); - set_except_vector(10, handle_ri); + set_except_vector(10, rdhwr_noopt ? handle_ri : + (cpu_has_vtag_icache ? + handle_ri_rdhwr_vivt : handle_ri_rdhwr)); set_except_vector(11, handle_cpu); set_except_vector(12, handle_ov); set_except_vector(13, handle_tr);