| /* |
| * 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[0x200] __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; |
| } |