319 lines
7.9 KiB
C
319 lines
7.9 KiB
C
/*
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* linux/arch/m32r/kernel/traps.c
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*
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* Copyright (C) 2001, 2002 Hirokazu Takata, Hiroyuki Kondo,
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* Hitoshi Yamamoto
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*/
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/*
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* 'traps.c' handles hardware traps and faults after we have saved some
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* state in 'entry.S'.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/kallsyms.h>
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#include <linux/stddef.h>
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#include <linux/ptrace.h>
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#include <linux/mm.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <linux/atomic.h>
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#include <asm/smp.h>
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#include <linux/module.h>
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asmlinkage void alignment_check(void);
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asmlinkage void ei_handler(void);
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asmlinkage void rie_handler(void);
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asmlinkage void debug_trap(void);
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asmlinkage void cache_flushing_handler(void);
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asmlinkage void ill_trap(void);
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#ifdef CONFIG_SMP
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extern void smp_reschedule_interrupt(void);
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extern void smp_invalidate_interrupt(void);
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extern void smp_call_function_interrupt(void);
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extern void smp_ipi_timer_interrupt(void);
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extern void smp_flush_cache_all_interrupt(void);
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extern void smp_call_function_single_interrupt(void);
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/*
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* for Boot AP function
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*/
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asm (
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" .section .eit_vector4,\"ax\" \n"
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" .global _AP_RE \n"
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" .global startup_AP \n"
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"_AP_RE: \n"
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" .fill 32, 4, 0 \n"
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"_AP_EI: bra startup_AP \n"
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" .previous \n"
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);
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#endif /* CONFIG_SMP */
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extern unsigned long eit_vector[];
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#define BRA_INSN(func, entry) \
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((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
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+ 0xff000000UL
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static void set_eit_vector_entries(void)
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{
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extern void default_eit_handler(void);
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extern void system_call(void);
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extern void pie_handler(void);
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extern void ace_handler(void);
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extern void tme_handler(void);
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extern void _flush_cache_copyback_all(void);
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eit_vector[0] = 0xd0c00001; /* seth r0, 0x01 */
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eit_vector[1] = BRA_INSN(default_eit_handler, 1);
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eit_vector[4] = 0xd0c00010; /* seth r0, 0x10 */
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eit_vector[5] = BRA_INSN(default_eit_handler, 5);
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eit_vector[8] = BRA_INSN(rie_handler, 8);
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eit_vector[12] = BRA_INSN(alignment_check, 12);
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eit_vector[16] = BRA_INSN(ill_trap, 16);
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eit_vector[17] = BRA_INSN(debug_trap, 17);
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eit_vector[18] = BRA_INSN(system_call, 18);
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eit_vector[19] = BRA_INSN(ill_trap, 19);
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eit_vector[20] = BRA_INSN(ill_trap, 20);
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eit_vector[21] = BRA_INSN(ill_trap, 21);
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eit_vector[22] = BRA_INSN(ill_trap, 22);
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eit_vector[23] = BRA_INSN(ill_trap, 23);
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eit_vector[24] = BRA_INSN(ill_trap, 24);
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eit_vector[25] = BRA_INSN(ill_trap, 25);
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eit_vector[26] = BRA_INSN(ill_trap, 26);
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eit_vector[27] = BRA_INSN(ill_trap, 27);
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eit_vector[28] = BRA_INSN(cache_flushing_handler, 28);
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eit_vector[29] = BRA_INSN(ill_trap, 29);
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eit_vector[30] = BRA_INSN(ill_trap, 30);
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eit_vector[31] = BRA_INSN(ill_trap, 31);
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eit_vector[32] = BRA_INSN(ei_handler, 32);
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eit_vector[64] = BRA_INSN(pie_handler, 64);
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#ifdef CONFIG_MMU
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eit_vector[68] = BRA_INSN(ace_handler, 68);
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eit_vector[72] = BRA_INSN(tme_handler, 72);
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#endif /* CONFIG_MMU */
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#ifdef CONFIG_SMP
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eit_vector[184] = (unsigned long)smp_reschedule_interrupt;
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eit_vector[185] = (unsigned long)smp_invalidate_interrupt;
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eit_vector[186] = (unsigned long)smp_call_function_interrupt;
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eit_vector[187] = (unsigned long)smp_ipi_timer_interrupt;
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eit_vector[188] = (unsigned long)smp_flush_cache_all_interrupt;
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eit_vector[189] = 0; /* CPU_BOOT_IPI */
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eit_vector[190] = (unsigned long)smp_call_function_single_interrupt;
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eit_vector[191] = 0;
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#endif
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_flush_cache_copyback_all();
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}
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void __init trap_init(void)
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{
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set_eit_vector_entries();
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/*
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* Should be a barrier for any external CPU state.
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*/
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cpu_init();
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}
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static int kstack_depth_to_print = 24;
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static void show_trace(struct task_struct *task, unsigned long *stack)
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{
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unsigned long addr;
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if (!stack)
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stack = (unsigned long*)&stack;
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printk("Call Trace: ");
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while (!kstack_end(stack)) {
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addr = *stack++;
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if (__kernel_text_address(addr))
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printk("[<%08lx>] %pSR\n", addr, (void *)addr);
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}
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printk("\n");
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}
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void show_stack(struct task_struct *task, unsigned long *sp)
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{
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unsigned long *stack;
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int i;
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/*
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* debugging aid: "show_stack(NULL);" prints the
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* back trace for this cpu.
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*/
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if(sp==NULL) {
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if (task)
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sp = (unsigned long *)task->thread.sp;
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else
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sp=(unsigned long*)&sp;
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}
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stack = sp;
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for(i=0; i < kstack_depth_to_print; i++) {
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if (kstack_end(stack))
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break;
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if (i && ((i % 4) == 0))
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printk("\n ");
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printk("%08lx ", *stack++);
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}
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printk("\n");
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show_trace(task, sp);
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}
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static void show_registers(struct pt_regs *regs)
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{
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int i = 0;
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int in_kernel = 1;
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unsigned long sp;
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printk("CPU: %d\n", smp_processor_id());
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show_regs(regs);
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sp = (unsigned long) (1+regs);
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if (user_mode(regs)) {
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in_kernel = 0;
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sp = regs->spu;
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printk("SPU: %08lx\n", sp);
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} else {
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printk("SPI: %08lx\n", sp);
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}
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printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
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current->comm, task_pid_nr(current), 0xffff & i, 4096+(unsigned long)current);
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/*
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* When in-kernel, we also print out the stack and code at the
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* time of the fault..
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*/
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if (in_kernel) {
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printk("\nStack: ");
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show_stack(current, (unsigned long*) sp);
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printk("\nCode: ");
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if (regs->bpc < PAGE_OFFSET)
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goto bad;
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for(i=0;i<20;i++) {
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unsigned char c;
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if (__get_user(c, &((unsigned char*)regs->bpc)[i])) {
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bad:
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printk(" Bad PC value.");
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break;
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}
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printk("%02x ", c);
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}
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}
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printk("\n");
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}
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static DEFINE_SPINLOCK(die_lock);
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void die(const char * str, struct pt_regs * regs, long err)
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{
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console_verbose();
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spin_lock_irq(&die_lock);
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bust_spinlocks(1);
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printk("%s: %04lx\n", str, err & 0xffff);
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show_registers(regs);
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bust_spinlocks(0);
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spin_unlock_irq(&die_lock);
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do_exit(SIGSEGV);
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}
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static __inline__ void die_if_kernel(const char * str,
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struct pt_regs * regs, long err)
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{
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if (!user_mode(regs))
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die(str, regs, err);
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}
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static __inline__ void do_trap(int trapnr, int signr, const char * str,
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struct pt_regs * regs, long error_code, siginfo_t *info)
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{
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if (user_mode(regs)) {
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/* trap_signal */
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struct task_struct *tsk = current;
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tsk->thread.error_code = error_code;
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tsk->thread.trap_no = trapnr;
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if (info)
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force_sig_info(signr, info, tsk);
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else
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force_sig(signr, tsk);
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return;
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} else {
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/* kernel_trap */
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if (!fixup_exception(regs))
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die(str, regs, error_code);
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return;
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}
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}
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#define DO_ERROR(trapnr, signr, str, name) \
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asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
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{ \
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do_trap(trapnr, signr, NULL, regs, error_code, NULL); \
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}
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#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
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asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
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{ \
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siginfo_t info; \
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info.si_signo = signr; \
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info.si_errno = 0; \
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info.si_code = sicode; \
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info.si_addr = (void __user *)siaddr; \
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do_trap(trapnr, signr, str, regs, error_code, &info); \
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}
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DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
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DO_ERROR_INFO(0x20, SIGILL, "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
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DO_ERROR_INFO(0x100, SIGILL, "privileged instruction", pie_handler, ILL_PRVOPC, regs->bpc)
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DO_ERROR_INFO(-1, SIGILL, "illegal trap", ill_trap, ILL_ILLTRP, regs->bpc)
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extern int handle_unaligned_access(unsigned long, struct pt_regs *);
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/* This code taken from arch/sh/kernel/traps.c */
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asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
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{
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mm_segment_t oldfs;
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unsigned long insn;
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int tmp;
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oldfs = get_fs();
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if (user_mode(regs)) {
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local_irq_enable();
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current->thread.error_code = error_code;
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current->thread.trap_no = 0x17;
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set_fs(USER_DS);
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if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
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set_fs(oldfs);
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goto uspace_segv;
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}
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tmp = handle_unaligned_access(insn, regs);
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set_fs(oldfs);
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if (!tmp)
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return;
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uspace_segv:
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printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
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"access\n", current->comm);
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force_sig(SIGSEGV, current);
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} else {
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set_fs(KERNEL_DS);
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if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
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set_fs(oldfs);
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die("insn faulting in do_address_error", regs, 0);
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}
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handle_unaligned_access(insn, regs);
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set_fs(oldfs);
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}
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}
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