/* * 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> 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 print_regs(struct exception_state *state) { int i; printf("ELR = 0x%016llx\n",state->elr); printf("ESR = 0x%08llx\n",state->esr); for (i = 0; i < 31; i++) { printf("X%02d = 0x%016llx\n", i, state->regs[i]); } } void exception_dispatch(struct exception_state *state, int idx); void exception_dispatch(struct exception_state *state, int idx) { exception_state = state; 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); if (test_exc) { state->elr += 4; test_exc = 0; printf("returning back now\n"); } else halt(); } void exception_init(void) { extern void* exception_table; set_vbar(&exception_table); } void exception_install_hook(exception_hook h) { die_if(hook, "Implement support for a list of hooks if you need it."); hook = h; }