/*
* 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)
{
show_regs_print_info(KERN_DEFAULT);
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");
}
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();
}