2e0bca011a
To avoid trampling over interesting exception artifacts on the real stack, our arm64 systems switch to a separate exception stack when entering an exception handler. We don't want that to use up too much SRAM so we just set it to 512 bytes. I mean it just prints a bunch of registers, how much stack could it need, right? Quite a bit it turns out. The whole vtxprintf() call stack goes pretty deep, and aarch64 generally seems to be very generous with stack space. Just the varargs handling seems to require 128 bytes for some reason, and the other stuff adds up too. In the end the current implementation takes 1008 bytes, so bump the exception stack size to 2K to make sure it fits. Change-Id: I910be4c5f6b29fae35eb53929c733a1bd4585377 Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37464 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Hung-Te Lin <hungte@chromium.org>
135 lines
4.3 KiB
C
135 lines
4.3 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright 2014 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 <exception.h>
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#include <libpayload.h>
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#include <stdint.h>
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u64 exception_stack[2*KiB] __attribute__((aligned(16)));
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u64 *exception_stack_end = exception_stack + ARRAY_SIZE(exception_stack);
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extern unsigned int test_exc;
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struct exception_handler_info
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{
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const char *name;
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};
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static exception_hook hook;
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struct exception_state exception_state;
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static struct exception_handler_info exceptions[EXC_COUNT] = {
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[EXC_SYNC_SP0] = { "_sync_sp_el0" },
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[EXC_IRQ_SP0] = { "_irq_sp_el0" },
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[EXC_FIQ_SP0] = { "_fiq_sp_el0" },
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[EXC_SERROR_SP0] = {"_serror_sp_el0"},
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[EXC_SYNC_SPX] = { "_sync_spx" },
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[EXC_IRQ_SPX] = { "_irq_spx" },
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[EXC_FIQ_SPX] = { "_fiq_spx" },
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[EXC_SERROR_SPX] = {"_serror_spx"},
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[EXC_SYNC_ELX_64] = { "_sync_elx_64" },
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[EXC_IRQ_ELX_64] = { "_irq_elx_64" },
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[EXC_FIQ_ELX_64] = { "_fiq_elx_64" },
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[EXC_SERROR_ELX_64] = {"_serror_elx_64"},
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[EXC_SYNC_ELX_32] = { "_sync_elx_32" },
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[EXC_IRQ_ELX_32] = { "_irq_elx_32" },
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[EXC_FIQ_ELX_32] = { "_fiq_elx_32" },
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[EXC_SERROR_ELX_32] = {"_serror_elx_32"},
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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 words_per_line = 8;
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uint64_t *ptr = (void *)ALIGN_DOWN(addr, words_per_line * sizeof(*ptr));
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printf("Dumping stack:\n");
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for (i = bytes / sizeof(*ptr); i >= 0; i -= words_per_line) {
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printf("%p: ", ptr + i);
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for (j = i; j < i + words_per_line; j++)
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printf("%016llx ", *(ptr + j));
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printf("\n");
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}
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}
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static void print_regs(struct exception_state *state)
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{
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int i;
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printf("ELR = 0x%016llx ESR = 0x%08llx\n",
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state->elr, state->esr);
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printf("FAR = 0x%016llx SPSR = 0x%08llx\n",
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raw_read_far_el2(), raw_read_spsr_el2());
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for (i = 0; i < 30; i += 2) {
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printf("X%02d = 0x%016llx X%02d = 0x%016llx\n",
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i, state->regs[i], i + 1, state->regs[i + 1]);
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}
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printf("X30 = 0x%016llx SP = 0x%016llx\n",
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state->regs[30], state->sp);
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}
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void exception_dispatch(struct exception_state *state, int idx);
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void exception_dispatch(struct exception_state *state, int idx)
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{
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if (idx >= EXC_COUNT) {
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printf("Bad exception index %d.\n", idx);
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} else {
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struct exception_handler_info *info = &exceptions[idx];
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if (hook && hook(idx))
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return;
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if (info->name)
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printf("exception %s\n", info->name);
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else
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printf("exception _not_used.\n");
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}
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print_regs(state);
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/* Few words below SP in case we need state from a returned function. */
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dump_stack(state->sp - 32, 512);
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if (test_exc) {
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state->elr += 4;
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test_exc = 0;
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printf("returning back now\n");
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}
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else
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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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extern uint64_t exception_table[];
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raw_write_vbar_el2((uintptr_t)exception_table);
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exception_set_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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