136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright 2014 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <exception.h>
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#include <libpayload.h>
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#include <stdint.h>
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u64 exception_stack[2*KiB] __attribute__((aligned(16)));
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u64 *exception_stack_end = exception_stack + ARRAY_SIZE(exception_stack);
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extern unsigned int test_exc;
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struct exception_handler_info
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{
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const char *name;
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};
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static exception_hook hook;
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struct exception_state exception_state;
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static struct exception_handler_info exceptions[EXC_COUNT] = {
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[EXC_SYNC_SP0] = { "_sync_sp_el0" },
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[EXC_IRQ_SP0] = { "_irq_sp_el0" },
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[EXC_FIQ_SP0] = { "_fiq_sp_el0" },
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[EXC_SERROR_SP0] = {"_serror_sp_el0"},
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[EXC_SYNC_SPX] = { "_sync_spx" },
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[EXC_IRQ_SPX] = { "_irq_spx" },
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[EXC_FIQ_SPX] = { "_fiq_spx" },
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[EXC_SERROR_SPX] = {"_serror_spx"},
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[EXC_SYNC_ELX_64] = { "_sync_elx_64" },
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[EXC_IRQ_ELX_64] = { "_irq_elx_64" },
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[EXC_FIQ_ELX_64] = { "_fiq_elx_64" },
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[EXC_SERROR_ELX_64] = {"_serror_elx_64"},
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[EXC_SYNC_ELX_32] = { "_sync_elx_32" },
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[EXC_IRQ_ELX_32] = { "_irq_elx_32" },
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[EXC_FIQ_ELX_32] = { "_fiq_elx_32" },
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[EXC_SERROR_ELX_32] = {"_serror_elx_32"},
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};
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static void dump_stack(uintptr_t addr, size_t bytes)
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{
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int i, j;
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const int words_per_line = 8;
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uint64_t *ptr = (void *)ALIGN_DOWN(addr, words_per_line * sizeof(*ptr));
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printf("Dumping stack:\n");
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for (i = bytes / sizeof(*ptr); i >= 0; i -= words_per_line) {
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printf("%p: ", ptr + i);
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for (j = i; j < i + words_per_line; j++)
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printf("%016llx ", *(ptr + j));
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printf("\n");
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}
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}
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static void print_regs(struct exception_state *state)
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{
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int i;
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printf("ELR = 0x%016llx ESR = 0x%08llx\n",
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state->elr, state->esr);
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printf("FAR = 0x%016llx SPSR = 0x%08llx\n",
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raw_read_far_el2(), raw_read_spsr_el2());
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for (i = 0; i < 30; i += 2) {
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printf("X%02d = 0x%016llx X%02d = 0x%016llx\n",
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i, state->regs[i], i + 1, state->regs[i + 1]);
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}
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printf("X30 = 0x%016llx SP = 0x%016llx\n",
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state->regs[30], state->sp);
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}
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void exception_dispatch(struct exception_state *state, int idx);
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void exception_dispatch(struct exception_state *state, int idx)
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{
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if (idx >= EXC_COUNT) {
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printf("Bad exception index %d.\n", idx);
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} else {
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struct exception_handler_info *info = &exceptions[idx];
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if (hook && hook(idx))
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return;
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if (info->name)
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printf("exception %s\n", info->name);
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else
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printf("exception _not_used.\n");
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}
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print_regs(state);
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/* Few words below SP in case we need state from a returned function. */
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dump_stack(state->sp - 32, 512);
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if (test_exc) {
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state->elr += 4;
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test_exc = 0;
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printf("returning back now\n");
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}
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else
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halt();
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}
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void exception_init(void)
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{
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extern uint64_t exception_table[];
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raw_write_vbar_el2((uintptr_t)exception_table);
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exception_set_state_ptr(&exception_state);
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}
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void exception_install_hook(exception_hook h)
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{
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die_if(hook, "Implement support for a list of hooks if you need it.");
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hook = h;
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}
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