b2b7132fa3
Paging code is tricky and figuring out what is wrong with it can be a pain. This patch tries to ease the burden by giving a little more information for prefetch and data aborts, dumping the Instruction Fault Address Register (IFAR), Instruction Fault Status Register (IFSR) and Auxiliary Instruction Fault Status Register (AIFSR) or the respective Data registers. These contain additional information about the cause of the abort (internal/external, write or read, fault subtype, etc.) and the faulting address. BUG=None TEST=I have read through enough imprecise asynchronous external abort reports with this patch that I learned the bit pattern by heart. Change-Id: If1850c4a6df29b1195714ed0bdf025e51220e8ab Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: bf3b4924121825a5ceef7e5c14b7b307d01f8e9c Original-Change-Id: I56a0557d4257f40b5b30c559c84eaf9b9f729099 Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/223784 Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/9345 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
129 lines
3.8 KiB
C
129 lines
3.8 KiB
C
/*
|
|
* 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 <arch/cache.h>
|
|
#include <arch/exception.h>
|
|
#include <exception.h>
|
|
#include <libpayload.h>
|
|
#include <stdint.h>
|
|
|
|
u32 exception_stack[0x400] __attribute__((aligned(8)));
|
|
struct exception_state exception_state;
|
|
|
|
static exception_hook hook;
|
|
static const char *names[EXC_COUNT] = {
|
|
[EXC_UNDEF] = "Undefined Instruction",
|
|
[EXC_SWI] = "Software Interrupt",
|
|
[EXC_PABORT] = "Prefetch Abort",
|
|
[EXC_DABORT] = "Data Abort",
|
|
[EXC_IRQ] = "Interrupt",
|
|
[EXC_FIQ] = "Fast Interrupt",
|
|
};
|
|
|
|
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));
|
|
|
|
printf("Dumping stack:\n");
|
|
for (i = bytes / sizeof(*ptr); i >= 0; i -= line) {
|
|
printf("%p: ", ptr + i);
|
|
for (j = i; j < i + line; j++)
|
|
printf("%08x ", *(ptr + j));
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
static void print_regs(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
if (i == 15)
|
|
printf("PC");
|
|
else if (i == 14)
|
|
printf("LR");
|
|
else if (i == 13)
|
|
printf("SP");
|
|
else if (i == 12)
|
|
printf("IP");
|
|
else
|
|
printf("R%d", i);
|
|
printf(" = 0x%08x\n", exception_state.regs[i]);
|
|
}
|
|
printf("CPSR = 0x%08x\n", exception_state.cpsr);
|
|
}
|
|
|
|
void exception_dispatch(u32 idx)
|
|
{
|
|
die_if(idx >= EXC_COUNT || !names[idx], "Bad exception index %u!", idx);
|
|
|
|
if (hook && hook(idx))
|
|
return;
|
|
|
|
printf("%s Exception\n", names[idx]);
|
|
print_regs();
|
|
switch (idx) {
|
|
case EXC_PABORT:
|
|
printf("IFAR = %#.8x\n", read_ifar());
|
|
printf("IFSR = %#.8x\n", read_ifsr());
|
|
printf("AIFSR = %#.8x\n", read_aifsr());
|
|
break;
|
|
case EXC_DABORT:
|
|
printf("DFAR = %#.8x\n", read_dfar());
|
|
printf("DFSR = %#.8x\n", read_dfsr());
|
|
printf("ADFSR = %#.8x\n", read_adfsr());
|
|
break;
|
|
};
|
|
dump_stack(exception_state.regs[13], 512);
|
|
halt();
|
|
}
|
|
|
|
void exception_init(void)
|
|
{
|
|
uint32_t sctlr = read_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;
|
|
write_sctlr(sctlr);
|
|
|
|
extern uint32_t exception_table[];
|
|
set_vbar((uintptr_t)exception_table);
|
|
|
|
exception_stack_end = exception_stack + ARRAY_SIZE(exception_stack);
|
|
exception_state_ptr = &exception_state;
|
|
}
|
|
|
|
void exception_install_hook(exception_hook h)
|
|
{
|
|
die_if(hook, "Implement support for a list of hooks if you need it.");
|
|
hook = h;
|
|
}
|