mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 18:56:15 +09:00
7c6ca03eae
If an exception occurs, the relocated program counter and return address
are required for an analysis.
With this patch you get:
=> exception undefined
Unhandled exception: Illegal instruction
EPC: 0000000080595908 RA: 000000008059c0c6 TVAL: 000000008030c01e
EPC: 0000000080007908 RA: 000000008000e0c6 reloc adjusted
We can use the relocated addresses to find the involved functions in
u.boot.map:
.text.do_undefined
0x0000000080007908 0x8 cmd/built-in.o
.text.cmd_process
0x000000008000dfcc 0x11a common/built-in.o
0x000000008000dfcc cmd_process
If an exception occurs in an UEFI binary additionally the load addresses of
the UEFI binaries are needed. With this patch:
=> setenv efi_selftest exception
=> bootefi selftest
Unhandled exception: Illegal instruction
EPC: 000000008042e18a RA: 000000008042e18a TVAL: 000000008030c01e
EPC: 000000007fea018a RA: 000000007fea018a reloc adjusted
UEFI image [0x0000000000000000:0xffffffffffffffff] '/\selftest'
UEFI image [0x000000008042e000:0x000000008042e43f] pc=0x18a '/bug.efi'
The value pc=0x18a matches the position of the illegal instruction in
efi_selftest_miniapp_exception.efi (loaded as /bug.efi);
asm volatile (".word 0xffffffff\n");
00000180 93 85 C5 11 1C 64 22 85 82 97 FF FF FF FF 1C 64
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Tested-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Rick Chen <rick@andestech.com>
148 lines
3.6 KiB
C
148 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2016-17 Microsemi Corporation.
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* Padmarao Begari, Microsemi Corporation <padmarao.begari@microsemi.com>
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*
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* Copyright (C) 2017 Andes Technology Corporation
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* Rick Chen, Andes Technology Corporation <rick@andestech.com>
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*
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* Copyright (C) 2019 Sean Anderson <seanga2@gmail.com>
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*/
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#include <common.h>
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#include <efi_loader.h>
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#include <hang.h>
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#include <irq_func.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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#include <asm/encoding.h>
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DECLARE_GLOBAL_DATA_PTR;
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static void show_efi_loaded_images(uintptr_t epc)
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{
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efi_print_image_infos((void *)epc);
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}
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static void show_regs(struct pt_regs *regs)
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{
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#ifdef CONFIG_SHOW_REGS
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printf("SP: " REG_FMT " GP: " REG_FMT " TP: " REG_FMT "\n",
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regs->sp, regs->gp, regs->tp);
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printf("T0: " REG_FMT " T1: " REG_FMT " T2: " REG_FMT "\n",
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regs->t0, regs->t1, regs->t2);
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printf("S0: " REG_FMT " S1: " REG_FMT " A0: " REG_FMT "\n",
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regs->s0, regs->s1, regs->a0);
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printf("A1: " REG_FMT " A2: " REG_FMT " A3: " REG_FMT "\n",
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regs->a1, regs->a2, regs->a3);
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printf("A4: " REG_FMT " A5: " REG_FMT " A6: " REG_FMT "\n",
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regs->a4, regs->a5, regs->a6);
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printf("A7: " REG_FMT " S2: " REG_FMT " S3: " REG_FMT "\n",
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regs->a7, regs->s2, regs->s3);
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printf("S4: " REG_FMT " S5: " REG_FMT " S6: " REG_FMT "\n",
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regs->s4, regs->s5, regs->s6);
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printf("S7: " REG_FMT " S8: " REG_FMT " S9: " REG_FMT "\n",
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regs->s7, regs->s8, regs->s9);
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printf("S10: " REG_FMT " S11: " REG_FMT " T3: " REG_FMT "\n",
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regs->s10, regs->s11, regs->t3);
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printf("T4: " REG_FMT " T5: " REG_FMT " T6: " REG_FMT "\n\n",
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regs->t4, regs->t5, regs->t6);
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#endif
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}
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static void _exit_trap(ulong code, ulong epc, ulong tval, struct pt_regs *regs)
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{
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static const char * const exception_code[] = {
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"Instruction address misaligned",
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"Instruction access fault",
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"Illegal instruction",
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"Breakpoint",
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"Load address misaligned",
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"Load access fault",
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"Store/AMO address misaligned",
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"Store/AMO access fault",
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"Environment call from U-mode",
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"Environment call from S-mode",
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"Reserved",
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"Environment call from M-mode",
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"Instruction page fault",
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"Load page fault",
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"Reserved",
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"Store/AMO page fault",
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};
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if (code < ARRAY_SIZE(exception_code))
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printf("Unhandled exception: %s\n", exception_code[code]);
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else
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printf("Unhandled exception code: %ld\n", code);
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printf("EPC: " REG_FMT " RA: " REG_FMT " TVAL: " REG_FMT "\n",
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epc, regs->ra, tval);
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if (gd->flags & GD_FLG_RELOC)
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printf("EPC: " REG_FMT " RA: " REG_FMT " reloc adjusted\n\n",
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epc - gd->reloc_off, regs->ra - gd->reloc_off);
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show_regs(regs);
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show_efi_loaded_images(epc);
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hang();
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}
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int interrupt_init(void)
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{
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return 0;
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}
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/*
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* enable interrupts
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*/
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void enable_interrupts(void)
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{
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}
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/*
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* disable interrupts
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*/
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int disable_interrupts(void)
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{
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return 0;
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}
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ulong handle_trap(ulong cause, ulong epc, ulong tval, struct pt_regs *regs)
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{
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ulong is_irq, irq;
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is_irq = (cause & MCAUSE_INT);
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irq = (cause & ~MCAUSE_INT);
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if (is_irq) {
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switch (irq) {
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case IRQ_M_EXT:
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case IRQ_S_EXT:
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external_interrupt(0); /* handle external interrupt */
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break;
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case IRQ_M_TIMER:
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case IRQ_S_TIMER:
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timer_interrupt(0); /* handle timer interrupt */
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break;
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default:
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_exit_trap(cause, epc, tval, regs);
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break;
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};
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} else {
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_exit_trap(cause, epc, tval, regs);
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}
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return epc;
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}
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/*
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*Entry Point for PLIC Interrupt Handler
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*/
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__attribute__((weak)) void external_interrupt(struct pt_regs *regs)
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{
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}
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__attribute__((weak)) void timer_interrupt(struct pt_regs *regs)
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{
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}
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