| /* |
| * 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 <stdint.h> |
| #include <types.h> |
| #include <arch/exception.h> |
| #include <console/console.h> |
| |
| void exception_test(void); |
| |
| static int test_abort; |
| |
| void exception_undefined_instruction(uint32_t *); |
| void exception_software_interrupt(uint32_t *); |
| void exception_prefetch_abort(uint32_t *); |
| void exception_data_abort(uint32_t *); |
| void exception_not_used(uint32_t *); |
| void exception_irq(uint32_t *); |
| void exception_fiq(uint32_t *); |
| |
| 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)); |
| |
| printk(BIOS_ERR, "Dumping stack:\n"); |
| for (i = bytes / sizeof(*ptr); i >= 0; i -= line) { |
| printk(BIOS_ERR, "%p: ", ptr + i); |
| for (j = i; j < i + line; j++) |
| printk(BIOS_ERR, "%08x ", *(ptr + j)); |
| printk(BIOS_ERR, "\n"); |
| } |
| } |
| |
| static void print_regs(uint32_t *regs) |
| { |
| int i; |
| |
| for (i = 0; i < 16; i++) { |
| if (i == 15) |
| printk(BIOS_ERR, "PC"); |
| else if (i == 14) |
| printk(BIOS_ERR, "LR"); |
| else if (i == 13) |
| printk(BIOS_ERR, "SP"); |
| else if (i == 12) |
| printk(BIOS_ERR, "IP"); |
| else |
| printk(BIOS_ERR, "R%d", i); |
| printk(BIOS_ERR, " = 0x%08x\n", regs[i]); |
| } |
| } |
| |
| void exception_undefined_instruction(uint32_t *regs) |
| { |
| printk(BIOS_ERR, "exception _undefined_instruction\n"); |
| print_regs(regs); |
| dump_stack(regs[13], 512); |
| die("exception"); |
| } |
| |
| void exception_software_interrupt(uint32_t *regs) |
| { |
| printk(BIOS_ERR, "exception _software_interrupt\n"); |
| print_regs(regs); |
| dump_stack(regs[13], 512); |
| die("exception"); |
| } |
| |
| void exception_prefetch_abort(uint32_t *regs) |
| { |
| printk(BIOS_ERR, "exception _prefetch_abort\n"); |
| print_regs(regs); |
| dump_stack(regs[13], 512); |
| die("exception"); |
| } |
| |
| void exception_data_abort(uint32_t *regs) |
| { |
| if (test_abort) { |
| regs[15] = regs[0]; |
| return; |
| } else { |
| printk(BIOS_ERR, "exception _data_abort\n"); |
| print_regs(regs); |
| dump_stack(regs[13], 512); |
| } |
| die("exception"); |
| } |
| |
| void exception_not_used(uint32_t *regs) |
| { |
| printk(BIOS_ERR, "exception _not_used\n"); |
| print_regs(regs); |
| dump_stack(regs[13], 512); |
| die("exception"); |
| } |
| |
| void exception_irq(uint32_t *regs) |
| { |
| printk(BIOS_ERR, "exception _irq\n"); |
| print_regs(regs); |
| dump_stack(regs[13], 512); |
| die("exception"); |
| } |
| |
| void exception_fiq(uint32_t *regs) |
| { |
| printk(BIOS_ERR, "exception _fiq\n"); |
| print_regs(regs); |
| dump_stack(regs[13], 512); |
| die("exception"); |
| } |
| |
| static inline uint32_t get_sctlr(void) |
| { |
| uint32_t val; |
| asm("mrc p15, 0, %0, c1, c0, 0" : "=r" (val)); |
| return val; |
| } |
| |
| static inline void set_sctlr(uint32_t val) |
| { |
| asm volatile("mcr p15, 0, %0, c1, c0, 0" :: "r" (val)); |
| asm volatile("" ::: "memory"); |
| } |
| |
| void exception_init(void) |
| { |
| static const uint32_t sctlr_te = (0x1 << 30); |
| static const uint32_t sctlr_v = (0x1 << 13); |
| static const uint32_t sctlr_a = (0x1 << 1); |
| |
| uint32_t sctlr = get_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; |
| /* Enforce alignment temporarily. */ |
| set_sctlr(sctlr | sctlr_a); |
| |
| extern uint32_t exception_table[]; |
| set_vbar((uintptr_t)exception_table); |
| |
| test_abort = 1; |
| printk(BIOS_ERR, "Testing exceptions\n"); |
| exception_test(); |
| test_abort = 0; |
| printk(BIOS_ERR, "Testing exceptions: DONE\n"); |
| |
| /* Restore original alignment settings. */ |
| set_sctlr(sctlr); |
| } |