/* * 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 <console/console.h> #include <arch/exception.h> #include <stdint.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 print_regs(uint32_t *regs) { int i; /* Don't print the link register and stack pointer since we don't have their * actual value. They are hidden by the 'shadow' registers provided * by the trap hardware. */ for (i = 0; i < 16; i++) { if (i == 15) printk(BIOS_ERR, "PC"); else if (i == 14) continue; /* LR */ else if (i == 13) continue; /* 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); die("exception"); } void exception_software_interrupt(uint32_t *regs) { printk(BIOS_ERR, "exception _software_interrupt\n"); print_regs(regs); die("exception"); } void exception_prefetch_abort(uint32_t *regs) { printk(BIOS_ERR, "exception _prefetch_abort\n"); print_regs(regs); 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); } die("exception"); } void exception_not_used(uint32_t *regs) { printk(BIOS_ERR, "exception _not_used\n"); print_regs(regs); die("exception"); } void exception_irq(uint32_t *regs) { printk(BIOS_ERR, "exception _irq\n"); print_regs(regs); die("exception"); } void exception_fiq(uint32_t *regs) { printk(BIOS_ERR, "exception _fiq\n"); print_regs(regs); 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); }