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/*
* This file is part of the libpayload project.
*
* Copyright 2013 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <arch/cache.h>
#include <arch/exception.h>
#include <exception.h>
#include <libpayload.h>
#include <stdint.h>
uint8_t exception_stack[0x1000] __attribute__((aligned(8)));
extern void *exception_stack_end;
struct exception_handler_info
{
const char *name;
exception_hook hook;
};
static struct exception_handler_info exceptions[EXC_COUNT] = {
[EXC_UNDEF] = { "_undefined_instruction" },
[EXC_SWI] = { "_software_interrupt" },
[EXC_PABORT] = { "_prefetch_abort" },
[EXC_DABORT] = { "_data_abort" },
[EXC_IRQ] = { "_irq" },
[EXC_FIQ] = { "_fiq" },
};
static void dump_stack(uintptr_t addr, size_t bytes)
{
int i, j;
const int line = 8;
uint32_t *ptr = (uint32_t *)(addr & ~(line * sizeof(*ptr) - 1));
printf("Dumping stack:\n");
for (i = bytes / sizeof(*ptr); i >= 0; i -= line) {
printf("%p: ", ptr + i);
for (j = i; j < i + line; j++)
printf("%08x ", *(ptr + j));
printf("\n");
}
}
static void print_regs(struct exception_state *state)
{
int i;
for (i = 0; i < 16; i++) {
if (i == 15)
printf("PC");
else if (i == 14)
printf("LR");
else if (i == 13)
printf("SP");
else if (i == 12)
printf("IP");
else
printf("R%d", i);
printf(" = 0x%08x\n", state->regs[i]);
}
printf("CPSR = 0x%08x\n", state->cpsr);
}
void exception_dispatch(struct exception_state *state, int idx);
void exception_dispatch(struct exception_state *state, int idx)
{
if (idx >= EXC_COUNT) {
printf("Bad exception index %d.\n", idx);
} else {
struct exception_handler_info *info = &exceptions[idx];
if (info->hook) {
info->hook(idx, state);
return;
}
if (info->name)
printf("exception %s\n", info->name);
else
printf("exception _not_used.\n");
}
print_regs(state);
dump_stack(state->regs[13], 512);
halt();
}
void exception_init(void)
{
uint32_t sctlr = read_sctlr();
/* Handle exceptions in ARM mode. */
sctlr &= ~SCTLR_TE;
/* Set V=0 in SCTLR so VBAR points to the exception vector table. */
sctlr &= ~SCTLR_V;
write_sctlr(sctlr);
extern uint32_t exception_table[];
set_vbar((uintptr_t)exception_table);
exception_stack_end = exception_stack + sizeof(exception_stack);
}
void exception_install_hook(int type, exception_hook hook)
{
die_if(type >= EXC_COUNT, "Out of bounds exception index %d.\n", type);
exceptions[type].hook = hook;
}
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