| /* |
| * 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/arm/v7/exception.h> |
| #include <base/exception.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "base/algorithm.h" |
| #include "base/die.h" |
| |
| uint32_t exception_stack[0x400] __attribute__((aligned(8))); |
| ExceptionState exception_state; |
| |
| static ExceptionHook hook; |
| static const char *names[EXC_COUNT] = { |
| [EXC_UNDEF] = "Undefined Instruction", |
| [EXC_SWI] = "Software Interrupt", |
| [EXC_PABORT] = "Prefetch Abort", |
| [EXC_DABORT] = "Data Abort", |
| [EXC_IRQ] = "Interrupt", |
| [EXC_FIQ] = "Fast Interrupt", |
| }; |
| |
| 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(void) |
| { |
| 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", exception_state.regs[i]); |
| } |
| printf("CPSR = 0x%08x\n", exception_state.cpsr); |
| } |
| |
| void exception_dispatch(uint32_t idx) |
| { |
| die_if(idx >= EXC_COUNT || !names[idx], "Bad exception index %u!", idx); |
| |
| if (hook && hook(idx)) |
| return; |
| |
| printf("%s Exception\n", names[idx]); |
| print_regs(); |
| switch (idx) { |
| case EXC_PABORT: |
| printf("IFAR = %#.8x\n", read_ifar()); |
| printf("IFSR = %#.8x\n", read_ifsr()); |
| printf("AIFSR = %#.8x\n", read_aifsr()); |
| break; |
| case EXC_DABORT: |
| printf("DFAR = %#.8x\n", read_dfar()); |
| printf("DFSR = %#.8x\n", read_dfsr()); |
| printf("ADFSR = %#.8x\n", read_adfsr()); |
| break; |
| }; |
| dump_stack(exception_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 + ARRAY_SIZE(exception_stack); |
| exception_state_ptr = &exception_state; |
| } |
| |
| void exception_install_hook(ExceptionHook h) |
| { |
| die_if(hook, "Implement support for a list of hooks if you need it."); |
| hook = h; |
| } |