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linux-sg2042/arch/m32r/kernel/traps.c

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