/* * OpenRISC traps.c * * Linux architectural port borrowing liberally from similar works of * others. All original copyrights apply as per the original source * declaration. * * Modifications for the OpenRISC architecture: * Copyright (C) 2003 Matjaz Breskvar * Copyright (C) 2010-2011 Jonas Bonn * * 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. * * Here we handle the break vectors not used by the system call * mechanism, as well as some general stack/register dumping * things. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern char _etext, _stext; int kstack_depth_to_print = 0x180; int lwa_flag; unsigned long __user *lwa_addr; static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) { return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3; } void show_trace(struct task_struct *task, unsigned long *stack) { struct thread_info *context; unsigned long addr; context = (struct thread_info *) ((unsigned long)stack & (~(THREAD_SIZE - 1))); while (valid_stack_ptr(context, stack)) { addr = *stack++; if (__kernel_text_address(addr)) { printk(" [<%08lx>]", addr); print_symbol(" %s", addr); printk("\n"); } } printk(" =======================\n"); } /* displays a short stack trace */ void show_stack(struct task_struct *task, unsigned long *esp) { unsigned long addr, *stack; int i; if (esp == NULL) esp = (unsigned long *)&esp; stack = esp; printk("Stack dump [0x%08lx]:\n", (unsigned long)esp); for (i = 0; i < kstack_depth_to_print; i++) { if (kstack_end(stack)) break; if (__get_user(addr, stack)) { /* This message matches "failing address" marked s390 in ksymoops, so lines containing it will not be filtered out by ksymoops. */ printk("Failing address 0x%lx\n", (unsigned long)stack); break; } stack++; printk("sp + %02d: 0x%08lx\n", i * 4, addr); } printk("\n"); show_trace(task, esp); return; } void show_trace_task(struct task_struct *tsk) { /* * TODO: SysRq-T trace dump... */ } void show_registers(struct pt_regs *regs) { int i; int in_kernel = 1; unsigned long esp; esp = (unsigned long)(®s->sp); if (user_mode(regs)) in_kernel = 0; printk("CPU #: %d\n" " PC: %08lx SR: %08lx SP: %08lx\n", smp_processor_id(), regs->pc, regs->sr, regs->sp); printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); printk(" RES: %08lx oGPR11: %08lx\n", regs->gpr[11], regs->orig_gpr11); printk("Process %s (pid: %d, stackpage=%08lx)\n", current->comm, current->pid, (unsigned long)current); /* * When in-kernel, we also print out the stack and code at the * time of the fault.. */ if (in_kernel) { printk("\nStack: "); show_stack(NULL, (unsigned long *)esp); printk("\nCode: "); if (regs->pc < PAGE_OFFSET) goto bad; for (i = -24; i < 24; i++) { unsigned char c; if (__get_user(c, &((unsigned char *)regs->pc)[i])) { bad: printk(" Bad PC value."); break; } if (i == 0) printk("(%02x) ", c); else printk("%02x ", c); } } printk("\n"); } void nommu_dump_state(struct pt_regs *regs, unsigned long ea, unsigned long vector) { int i; unsigned long addr, stack = regs->sp; printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector); printk("CPU #: %d\n" " PC: %08lx SR: %08lx SP: %08lx\n", 0, regs->pc, regs->sr, regs->sp); printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); printk(" RES: %08lx oGPR11: %08lx\n", regs->gpr[11], regs->orig_gpr11); printk("Process %s (pid: %d, stackpage=%08lx)\n", ((struct task_struct *)(__pa(current)))->comm, ((struct task_struct *)(__pa(current)))->pid, (unsigned long)current); printk("\nStack: "); printk("Stack dump [0x%08lx]:\n", (unsigned long)stack); for (i = 0; i < kstack_depth_to_print; i++) { if (((long)stack & (THREAD_SIZE - 1)) == 0) break; stack++; printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4, *((unsigned long *)(__pa(stack)))); } printk("\n"); printk("Call Trace: "); i = 1; while (((long)stack & (THREAD_SIZE - 1)) != 0) { addr = *((unsigned long *)__pa(stack)); stack++; if (kernel_text_address(addr)) { if (i && ((i % 6) == 0)) printk("\n "); printk(" [<%08lx>]", addr); i++; } } printk("\n"); printk("\nCode: "); for (i = -24; i < 24; i++) { unsigned char c; c = ((unsigned char *)(__pa(regs->pc)))[i]; if (i == 0) printk("(%02x) ", c); else printk("%02x ", c); } printk("\n"); } /* This is normally the 'Oops' routine */ void die(const char *str, struct pt_regs *regs, long err) { console_verbose(); printk("\n%s#: %04lx\n", str, err & 0xffff); show_registers(regs); #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n"); /* shut down interrupts */ local_irq_disable(); __asm__ __volatile__("l.nop 1"); do {} while (1); #endif do_exit(SIGSEGV); } /* This is normally the 'Oops' routine */ void die_if_kernel(const char *str, struct pt_regs *regs, long err) { if (user_mode(regs)) return; die(str, regs, err); } void unhandled_exception(struct pt_regs *regs, int ea, int vector) { printk("Unable to handle exception at EA =0x%x, vector 0x%x", ea, vector); die("Oops", regs, 9); } void __init trap_init(void) { /* Nothing needs to be done */ } asmlinkage void do_trap(struct pt_regs *regs, unsigned long address) { siginfo_t info; memset(&info, 0, sizeof(info)); info.si_signo = SIGTRAP; info.si_code = TRAP_TRACE; info.si_addr = (void *)address; force_sig_info(SIGTRAP, &info, current); regs->pc += 4; } asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address) { siginfo_t info; if (user_mode(regs)) { /* Send a SIGBUS */ info.si_signo = SIGBUS; info.si_errno = 0; info.si_code = BUS_ADRALN; info.si_addr = (void __user *)address; force_sig_info(SIGBUS, &info, current); } else { printk("KERNEL: Unaligned Access 0x%.8lx\n", address); show_registers(regs); die("Die:", regs, address); } } asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address) { siginfo_t info; if (user_mode(regs)) { /* Send a SIGBUS */ info.si_signo = SIGBUS; info.si_errno = 0; info.si_code = BUS_ADRERR; info.si_addr = (void *)address; force_sig_info(SIGBUS, &info, current); } else { /* Kernel mode */ printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address); show_registers(regs); die("Die:", regs, address); } } static inline int in_delay_slot(struct pt_regs *regs) { #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX /* No delay slot flag, do the old way */ unsigned int op, insn; insn = *((unsigned int *)regs->pc); op = insn >> 26; switch (op) { case 0x00: /* l.j */ case 0x01: /* l.jal */ case 0x03: /* l.bnf */ case 0x04: /* l.bf */ case 0x11: /* l.jr */ case 0x12: /* l.jalr */ return 1; default: return 0; } #else return mfspr(SPR_SR) & SPR_SR_DSX; #endif } static inline void adjust_pc(struct pt_regs *regs, unsigned long address) { int displacement; unsigned int rb, op, jmp; if (unlikely(in_delay_slot(regs))) { /* In delay slot, instruction at pc is a branch, simulate it */ jmp = *((unsigned int *)regs->pc); displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27); rb = (jmp & 0x0000ffff) >> 11; op = jmp >> 26; switch (op) { case 0x00: /* l.j */ regs->pc += displacement; return; case 0x01: /* l.jal */ regs->pc += displacement; regs->gpr[9] = regs->pc + 8; return; case 0x03: /* l.bnf */ if (regs->sr & SPR_SR_F) regs->pc += 8; else regs->pc += displacement; return; case 0x04: /* l.bf */ if (regs->sr & SPR_SR_F) regs->pc += displacement; else regs->pc += 8; return; case 0x11: /* l.jr */ regs->pc = regs->gpr[rb]; return; case 0x12: /* l.jalr */ regs->pc = regs->gpr[rb]; regs->gpr[9] = regs->pc + 8; return; default: break; } } else { regs->pc += 4; } } static inline void simulate_lwa(struct pt_regs *regs, unsigned long address, unsigned int insn) { unsigned int ra, rd; unsigned long value; unsigned long orig_pc; long imm; const struct exception_table_entry *entry; orig_pc = regs->pc; adjust_pc(regs, address); ra = (insn >> 16) & 0x1f; rd = (insn >> 21) & 0x1f; imm = (short)insn; lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm); if ((unsigned long)lwa_addr & 0x3) { do_unaligned_access(regs, address); return; } if (get_user(value, lwa_addr)) { if (user_mode(regs)) { force_sig(SIGSEGV, current); return; } if ((entry = search_exception_tables(orig_pc))) { regs->pc = entry->fixup; return; } /* kernel access in kernel space, load it directly */ value = *((unsigned long *)lwa_addr); } lwa_flag = 1; regs->gpr[rd] = value; } static inline void simulate_swa(struct pt_regs *regs, unsigned long address, unsigned int insn) { unsigned long __user *vaddr; unsigned long orig_pc; unsigned int ra, rb; long imm; const struct exception_table_entry *entry; orig_pc = regs->pc; adjust_pc(regs, address); ra = (insn >> 16) & 0x1f; rb = (insn >> 11) & 0x1f; imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff)); vaddr = (unsigned long __user *)(regs->gpr[ra] + imm); if (!lwa_flag || vaddr != lwa_addr) { regs->sr &= ~SPR_SR_F; return; } if ((unsigned long)vaddr & 0x3) { do_unaligned_access(regs, address); return; } if (put_user(regs->gpr[rb], vaddr)) { if (user_mode(regs)) { force_sig(SIGSEGV, current); return; } if ((entry = search_exception_tables(orig_pc))) { regs->pc = entry->fixup; return; } /* kernel access in kernel space, store it directly */ *((unsigned long *)vaddr) = regs->gpr[rb]; } lwa_flag = 0; regs->sr |= SPR_SR_F; } #define INSN_LWA 0x1b #define INSN_SWA 0x33 asmlinkage void do_illegal_instruction(struct pt_regs *regs, unsigned long address) { siginfo_t info; unsigned int op; unsigned int insn = *((unsigned int *)address); op = insn >> 26; switch (op) { case INSN_LWA: simulate_lwa(regs, address, insn); return; case INSN_SWA: simulate_swa(regs, address, insn); return; default: break; } if (user_mode(regs)) { /* Send a SIGILL */ info.si_signo = SIGILL; info.si_errno = 0; info.si_code = ILL_ILLOPC; info.si_addr = (void *)address; force_sig_info(SIGBUS, &info, current); } else { /* Kernel mode */ printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n", address); show_registers(regs); die("Die:", regs, address); } }