130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/*
|
|
* 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;
|
|
}
|