diff options
Diffstat (limited to 'arch/score/kernel/traps.c')
| -rw-r--r-- | arch/score/kernel/traps.c | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/arch/score/kernel/traps.c b/arch/score/kernel/traps.c new file mode 100644 index 000000000000..0e46fb19a848 --- /dev/null +++ b/arch/score/kernel/traps.c @@ -0,0 +1,349 @@ +/* + * arch/score/kernel/traps.c + * + * Score Processor version. + * + * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. + * Chen Liqin <liqin.chen@sunplusct.com> + * Lennox Wu <lennox.wu@sunplusct.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <linux/module.h> +#include <linux/sched.h> + +#include <asm/cacheflush.h> +#include <asm/irq.h> +#include <asm/irq_regs.h> + +unsigned long exception_handlers[32]; + +/* + * The architecture-independent show_stack generator + */ +void show_stack(struct task_struct *task, unsigned long *sp) +{ + int i; + long stackdata; + + sp = sp ? sp : (unsigned long *)&sp; + + printk(KERN_NOTICE "Stack: "); + i = 1; + while ((long) sp & (PAGE_SIZE - 1)) { + if (i && ((i % 8) == 0)) + printk(KERN_NOTICE "\n"); + if (i > 40) { + printk(KERN_NOTICE " ..."); + break; + } + + if (__get_user(stackdata, sp++)) { + printk(KERN_NOTICE " (Bad stack address)"); + break; + } + + printk(KERN_NOTICE " %08lx", stackdata); + i++; + } + printk(KERN_NOTICE "\n"); +} + +static void show_trace(long *sp) +{ + int i; + long addr; + + sp = sp ? sp : (long *) &sp; + + printk(KERN_NOTICE "Call Trace: "); + i = 1; + while ((long) sp & (PAGE_SIZE - 1)) { + if (__get_user(addr, sp++)) { + if (i && ((i % 6) == 0)) + printk(KERN_NOTICE "\n"); + printk(KERN_NOTICE " (Bad stack address)\n"); + break; + } + + if (kernel_text_address(addr)) { + if (i && ((i % 6) == 0)) + printk(KERN_NOTICE "\n"); + if (i > 40) { + printk(KERN_NOTICE " ..."); + break; + } + + printk(KERN_NOTICE " [<%08lx>]", addr); + i++; + } + } + printk(KERN_NOTICE "\n"); +} + +static void show_code(unsigned int *pc) +{ + long i; + + printk(KERN_NOTICE "\nCode:"); + + for (i = -3; i < 6; i++) { + unsigned long insn; + if (__get_user(insn, pc + i)) { + printk(KERN_NOTICE " (Bad address in epc)\n"); + break; + } + printk(KERN_NOTICE "%c%08lx%c", (i ? ' ' : '<'), + insn, (i ? ' ' : '>')); + } +} + +/* + * FIXME: really the generic show_regs should take a const pointer argument. + */ +void show_regs(struct pt_regs *regs) +{ + printk("r0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", + regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3], + regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]); + printk("r8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", + regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11], + regs->regs[12], regs->regs[13], regs->regs[14], regs->regs[15]); + printk("r16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", + regs->regs[16], regs->regs[17], regs->regs[18], regs->regs[19], + regs->regs[20], regs->regs[21], regs->regs[22], regs->regs[23]); + printk("r24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", + regs->regs[24], regs->regs[25], regs->regs[26], regs->regs[27], + regs->regs[28], regs->regs[29], regs->regs[30], regs->regs[31]); + + printk("CEH : %08lx\n", regs->ceh); + printk("CEL : %08lx\n", regs->cel); + + printk("EMA:%08lx, epc:%08lx %s\nPSR: %08lx\nECR:%08lx\nCondition : %08lx\n", + regs->cp0_ema, regs->cp0_epc, print_tainted(), regs->cp0_psr, + regs->cp0_ecr, regs->cp0_condition); +} + +static void show_registers(struct pt_regs *regs) +{ + show_regs(regs); + printk(KERN_NOTICE "Process %s (pid: %d, stackpage=%08lx)\n", + current->comm, current->pid, (unsigned long) current); + show_stack(current_thread_info()->task, (long *) regs->regs[0]); + show_trace((long *) regs->regs[0]); + show_code((unsigned int *) regs->cp0_epc); + printk(KERN_NOTICE "\n"); +} + +/* + * The architecture-independent dump_stack generator + */ +void dump_stack(void) +{ + show_stack(current_thread_info()->task, + (long *) get_irq_regs()->regs[0]); +} +EXPORT_SYMBOL(dump_stack); + +void __die(const char *str, struct pt_regs *regs, const char *file, + const char *func, unsigned long line) +{ + console_verbose(); + printk("%s", str); + if (file && func) + printk(" in %s:%s, line %ld", file, func, line); + printk(":\n"); + show_registers(regs); + do_exit(SIGSEGV); +} + +void __die_if_kernel(const char *str, struct pt_regs *regs, + const char *file, const char *func, unsigned long line) +{ + if (!user_mode(regs)) + __die(str, regs, file, func, line); +} + +asmlinkage void do_adelinsn(struct pt_regs *regs) +{ + printk("do_ADE-linsn:ema:0x%08lx:epc:0x%08lx\n", + regs->cp0_ema, regs->cp0_epc); + die_if_kernel("do_ade execution Exception\n", regs); + force_sig(SIGBUS, current); +} + +asmlinkage void do_adedata(struct pt_regs *regs) +{ + const struct exception_table_entry *fixup; + fixup = search_exception_tables(regs->cp0_epc); + if (fixup) { + regs->cp0_epc = fixup->fixup; + return; + } + printk("do_ADE-data:ema:0x%08lx:epc:0x%08lx\n", + regs->cp0_ema, regs->cp0_epc); + die_if_kernel("do_ade execution Exception\n", regs); + force_sig(SIGBUS, current); +} + +asmlinkage void do_pel(struct pt_regs *regs) +{ + die_if_kernel("do_pel execution Exception", regs); + force_sig(SIGFPE, current); +} + +asmlinkage void do_cee(struct pt_regs *regs) +{ + die_if_kernel("do_cee execution Exception", regs); + force_sig(SIGFPE, current); +} + +asmlinkage void do_cpe(struct pt_regs *regs) +{ + die_if_kernel("do_cpe execution Exception", regs); + force_sig(SIGFPE, current); +} + +asmlinkage void do_be(struct pt_regs *regs) +{ + die_if_kernel("do_be execution Exception", regs); + force_sig(SIGBUS, current); +} + +asmlinkage void do_ov(struct pt_regs *regs) +{ + siginfo_t info; + + die_if_kernel("do_ov execution Exception", regs); + + info.si_code = FPE_INTOVF; + info.si_signo = SIGFPE; + info.si_errno = 0; + info.si_addr = (void *)regs->cp0_epc; + force_sig_info(SIGFPE, &info, current); +} + +asmlinkage void do_tr(struct pt_regs *regs) +{ + die_if_kernel("do_tr execution Exception", regs); + force_sig(SIGTRAP, current); +} + +asmlinkage void do_ri(struct pt_regs *regs) +{ + unsigned long epc_insn; + unsigned long epc = regs->cp0_epc; + + read_tsk_long(current, epc, &epc_insn); + if (current->thread.single_step == 1) { + if ((epc == current->thread.addr1) || + (epc == current->thread.addr2)) { + user_disable_single_step(current); + force_sig(SIGTRAP, current); + return; + } else + BUG(); + } else if ((epc_insn == BREAKPOINT32_INSN) || + ((epc_insn & 0x0000FFFF) == 0x7002) || + ((epc_insn & 0xFFFF0000) == 0x70020000)) { + force_sig(SIGTRAP, current); + return; + } else { + die_if_kernel("do_ri execution Exception", regs); + force_sig(SIGILL, current); + } +} + +asmlinkage void do_ccu(struct pt_regs *regs) +{ + die_if_kernel("do_ccu execution Exception", regs); + force_sig(SIGILL, current); +} + +asmlinkage void do_reserved(struct pt_regs *regs) +{ + /* + * Game over - no way to handle this if it ever occurs. Most probably + * caused by a new unknown cpu type or after another deadly + * hard/software error. + */ + die_if_kernel("do_reserved execution Exception", regs); + show_regs(regs); + panic("Caught reserved exception - should not happen."); +} + +/* + * NMI exception handler. + */ +void nmi_exception_handler(struct pt_regs *regs) +{ + die_if_kernel("nmi_exception_handler execution Exception", regs); + die("NMI", regs); +} + +/* Install CPU exception handler */ +void *set_except_vector(int n, void *addr) +{ + unsigned long handler = (unsigned long) addr; + unsigned long old_handler = exception_handlers[n]; + + exception_handlers[n] = handler; + return (void *)old_handler; +} + +void __init trap_init(void) +{ + int i; + + pgd_current = (unsigned long)init_mm.pgd; + /* DEBUG EXCEPTION */ + memcpy((void *)DEBUG_VECTOR_BASE_ADDR, + &debug_exception_vector, DEBUG_VECTOR_SIZE); + /* NMI EXCEPTION */ + memcpy((void *)GENERAL_VECTOR_BASE_ADDR, + &general_exception_vector, GENERAL_VECTOR_SIZE); + + /* + * Initialise exception handlers + */ + for (i = 0; i <= 31; i++) + set_except_vector(i, handle_reserved); + + set_except_vector(1, handle_nmi); + set_except_vector(2, handle_adelinsn); + set_except_vector(3, handle_tlb_refill); + set_except_vector(4, handle_tlb_invaild); + set_except_vector(5, handle_ibe); + set_except_vector(6, handle_pel); + set_except_vector(7, handle_sys); + set_except_vector(8, handle_ccu); + set_except_vector(9, handle_ri); + set_except_vector(10, handle_tr); + set_except_vector(11, handle_adedata); + set_except_vector(12, handle_adedata); + set_except_vector(13, handle_tlb_refill); + set_except_vector(14, handle_tlb_invaild); + set_except_vector(15, handle_mod); + set_except_vector(16, handle_cee); + set_except_vector(17, handle_cpe); + set_except_vector(18, handle_dbe); + flush_icache_range(DEBUG_VECTOR_BASE_ADDR, IRQ_VECTOR_BASE_ADDR); + + atomic_inc(&init_mm.mm_count); + current->active_mm = &init_mm; + cpu_cache_init(); +} |