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/*
* This file is part of the libpayload project.
*
* Copyright 2014 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 <exception.h>
#include <libpayload.h>
#include <stdint.h>
u64 exception_stack[2*KiB] __attribute__((aligned(16)));
u64 *exception_stack_end = exception_stack + ARRAY_SIZE(exception_stack);
extern unsigned int test_exc;
struct exception_handler_info
{
const char *name;
};
static exception_hook hook;
struct exception_state exception_state;
static struct exception_handler_info exceptions[EXC_COUNT] = {
[EXC_SYNC_SP0] = { "_sync_sp_el0" },
[EXC_IRQ_SP0] = { "_irq_sp_el0" },
[EXC_FIQ_SP0] = { "_fiq_sp_el0" },
[EXC_SERROR_SP0] = {"_serror_sp_el0"},
[EXC_SYNC_SPX] = { "_sync_spx" },
[EXC_IRQ_SPX] = { "_irq_spx" },
[EXC_FIQ_SPX] = { "_fiq_spx" },
[EXC_SERROR_SPX] = {"_serror_spx"},
[EXC_SYNC_ELX_64] = { "_sync_elx_64" },
[EXC_IRQ_ELX_64] = { "_irq_elx_64" },
[EXC_FIQ_ELX_64] = { "_fiq_elx_64" },
[EXC_SERROR_ELX_64] = {"_serror_elx_64"},
[EXC_SYNC_ELX_32] = { "_sync_elx_32" },
[EXC_IRQ_ELX_32] = { "_irq_elx_32" },
[EXC_FIQ_ELX_32] = { "_fiq_elx_32" },
[EXC_SERROR_ELX_32] = {"_serror_elx_32"},
};
static void dump_stack(uintptr_t addr, size_t bytes)
{
int i, j;
const int words_per_line = 8;
uint64_t *ptr = (void *)ALIGN_DOWN(addr, words_per_line * sizeof(*ptr));
printf("Dumping stack:\n");
for (i = bytes / sizeof(*ptr); i >= 0; i -= words_per_line) {
printf("%p: ", ptr + i);
for (j = i; j < i + words_per_line; j++)
printf("%016llx ", *(ptr + j));
printf("\n");
}
}
static void print_regs(struct exception_state *state)
{
int i;
printf("ELR = 0x%016llx ESR = 0x%08llx\n",
state->elr, state->esr);
printf("FAR = 0x%016llx SPSR = 0x%08llx\n",
raw_read_far_el2(), raw_read_spsr_el2());
for (i = 0; i < 30; i += 2) {
printf("X%02d = 0x%016llx X%02d = 0x%016llx\n",
i, state->regs[i], i + 1, state->regs[i + 1]);
}
printf("X30 = 0x%016llx SP = 0x%016llx\n",
state->regs[30], state->sp);
}
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 (hook && hook(idx))
return;
if (info->name)
printf("exception %s\n", info->name);
else
printf("exception _not_used.\n");
}
print_regs(state);
/* Few words below SP in case we need state from a returned function. */
dump_stack(state->sp - 32, 512);
if (test_exc) {
state->elr += 4;
test_exc = 0;
printf("returning back now\n");
}
else
halt();
}
void exception_init(void)
{
extern uint64_t exception_table[];
raw_write_vbar_el2((uintptr_t)exception_table);
exception_set_state_ptr(&exception_state);
}
void exception_install_hook(exception_hook h)
{
die_if(hook, "Implement support for a list of hooks if you need it.");
hook = h;
}
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