118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright 2013 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <arch/cache.h>
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#include <arch/exception.h>
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#include <exception.h>
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#include <libpayload.h>
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#include <stdint.h>
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u32 exception_stack[0x400] __attribute__((aligned(8)));
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struct exception_state exception_state;
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static exception_hook hook;
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static const char *names[EXC_COUNT] = {
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[EXC_UNDEF] = "Undefined Instruction",
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[EXC_SWI] = "Software Interrupt",
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[EXC_PABORT] = "Prefetch Abort",
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[EXC_DABORT] = "Data Abort",
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[EXC_IRQ] = "Interrupt",
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[EXC_FIQ] = "Fast Interrupt",
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};
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static void dump_stack(uintptr_t addr, size_t bytes)
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{
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int i, j;
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const int line = 8;
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uint32_t *ptr = (uint32_t *)(addr & ~(line * sizeof(*ptr) - 1));
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printf("Dumping stack:\n");
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for (i = bytes / sizeof(*ptr); i >= 0; i -= line) {
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printf("%p: ", ptr + i);
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for (j = i; j < i + line; j++)
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printf("%08x ", *(ptr + j));
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printf("\n");
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}
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}
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static void print_regs(void)
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{
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int i;
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for (i = 0; i < 16; i++) {
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if (i == 15)
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printf("PC");
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else if (i == 14)
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printf("LR");
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else if (i == 13)
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printf("SP");
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else if (i == 12)
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printf("IP");
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else
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printf("R%d", i);
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printf(" = 0x%08x\n", exception_state.regs[i]);
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}
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printf("CPSR = 0x%08x\n", exception_state.cpsr);
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}
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void exception_dispatch(u32 idx)
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{
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die_if(idx >= EXC_COUNT || !names[idx], "Bad exception index %u!", idx);
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if (hook && hook(idx))
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return;
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printf("%s Exception\n", names[idx]);
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print_regs();
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dump_stack(exception_state.regs[13], 512);
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halt();
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}
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void exception_init(void)
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{
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uint32_t sctlr = read_sctlr();
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/* Handle exceptions in ARM mode. */
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sctlr &= ~SCTLR_TE;
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/* Set V=0 in SCTLR so VBAR points to the exception vector table. */
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sctlr &= ~SCTLR_V;
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write_sctlr(sctlr);
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extern uint32_t exception_table[];
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set_vbar((uintptr_t)exception_table);
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exception_stack_end = exception_stack + ARRAY_SIZE(exception_stack);
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exception_state_ptr = &exception_state;
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}
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void exception_install_hook(exception_hook h)
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{
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die_if(hook, "Implement support for a list of hooks if you need it.");
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hook = h;
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}
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