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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2014 Imagination Technologies
*
* 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; version 2 of the License.
*
* 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.
*/
#include <arch/exception.h>
#include <exception.h>
#include <libpayload.h>
#include <stdint.h>
u32 exception_stack[0x400] __attribute__((aligned(8)));
struct exception_state_t exception_state;
static const char *names[EXC_COUNT] = {
[EXC_CACHE_ERROR] = "Cache error exception",
[EXC_TLB_REFILL_AND_ALL] = "TLB refill or general exception",
[EXC_INTERRUPT] = "Interrupt",
[EXC_EJTAG_DEBUG] = "EJTAG debug exception"
};
static void dump_exception_state(void)
{
printf("%s exception!\n", names[exception_state_ptr->vector]);
printf("\nRegisters:\n");
printf("ZERO:\t0x%08x\n", exception_state_ptr->regs.zero);
printf("AT:\t0x%08x\n", exception_state_ptr->regs.at);
printf("V0:\t0x%08x\n", exception_state_ptr->regs.v0);
printf("V1:\t0x%08x\n", exception_state_ptr->regs.v1);
printf("A0:\t0x%08x\n", exception_state_ptr->regs.a0);
printf("A1:\t0x%08x\n", exception_state_ptr->regs.a1);
printf("A2:\t0x%08x\n", exception_state_ptr->regs.a2);
printf("A3:\t0x%08x\n", exception_state_ptr->regs.a3);
printf("T0:\t0x%08x\n", exception_state_ptr->regs.t0);
printf("T1:\t0x%08x\n", exception_state_ptr->regs.t1);
printf("T2:\t0x%08x\n", exception_state_ptr->regs.t2);
printf("T3:\t0x%08x\n", exception_state_ptr->regs.t3);
printf("T4:\t0x%08x\n", exception_state_ptr->regs.t4);
printf("T5:\t0x%08x\n", exception_state_ptr->regs.t5);
printf("T6:\t0x%08x\n", exception_state_ptr->regs.t6);
printf("T7:\t0x%08x\n", exception_state_ptr->regs.t7);
printf("S0:\t0x%08x\n", exception_state_ptr->regs.s0);
printf("S1:\t0x%08x\n", exception_state_ptr->regs.s1);
printf("S2:\t0x%08x\n", exception_state_ptr->regs.s2);
printf("S3:\t0x%08x\n", exception_state_ptr->regs.s3);
printf("S4:\t0x%08x\n", exception_state_ptr->regs.s4);
printf("S5:\t0x%08x\n", exception_state_ptr->regs.s5);
printf("S6:\t0x%08x\n", exception_state_ptr->regs.s6);
printf("S7:\t0x%08x\n", exception_state_ptr->regs.s7);
printf("T8:\t0x%08x\n", exception_state_ptr->regs.t8);
printf("T9:\t0x%08x\n", exception_state_ptr->regs.t9);
printf("K0:\t0x%08x\n", exception_state_ptr->regs.k0);
printf("K1:\t0x%08x\n", exception_state_ptr->regs.k1);
printf("GP:\t0x%08x\n", exception_state_ptr->regs.gp);
printf("SP:\t0x%08x\n", exception_state_ptr->regs.sp);
printf("FP:\t0x%08x\n", exception_state_ptr->regs.fp);
printf("RA:\t0x%08x\n", exception_state_ptr->regs.ra);
}
static void dump_stack(uintptr_t addr, size_t bytes)
{
int i, j;
const int words_per_line = 8;
int words_to_print;
uint32_t *ptr = (uint32_t *)
(addr & ~(words_per_line * sizeof(*ptr) - 1));
printf("Dumping stack:\n");
words_to_print = bytes/sizeof(*ptr);
for (i = words_to_print; i >= 0; i -= words_per_line) {
printf("%p: ", ptr + i);
for (j = i; j < i + words_per_line; j++)
printf("%08x ", *(ptr + j));
printf("\n");
}
}
void exception_dispatch(void)
{
u32 vec = exception_state_ptr->vector;
die_if(vec >= EXC_COUNT || !names[vec], "Bad exception vector %u", vec);
dump_exception_state();
dump_stack(exception_state_ptr->regs.sp, 512);
halt();
}
void exception_init(void)
{
exception_stack_end = exception_stack + ARRAY_SIZE(exception_stack);
exception_state_ptr = &exception_state;
exception_init_asm();
}
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