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https://github.com/brain-hackers/u-boot-brain
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fd1f6e9a0b
When debugging, it can be helpful to see more information about an unhandled exception. This patch adds an option to view the registers at the time of the trap, similar to the linux output on a kernel panic. Signed-off-by: Sean Anderson <seanga2@gmail.com> Reviewed-by: Rick Chen <rick@andestech.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
135 lines
3.3 KiB
C
135 lines
3.3 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 <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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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("RA: " REG_FMT " SP: " REG_FMT " GP: " REG_FMT "\n",
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regs->ra, regs->sp, regs->gp);
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printf("TP: " REG_FMT " T0: " REG_FMT " T1: " REG_FMT "\n",
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regs->tp, regs->t0, regs->t1);
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printf("T2: " REG_FMT " S0: " REG_FMT " S1: " REG_FMT "\n",
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regs->t2, regs->s0, regs->s1);
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printf("A0: " REG_FMT " A1: " REG_FMT " A2: " REG_FMT "\n",
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regs->a0, regs->a1, regs->a2);
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printf("A3: " REG_FMT " A4: " REG_FMT " A5: " REG_FMT "\n",
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regs->a3, regs->a4, regs->a5);
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printf("A6: " REG_FMT " A7: " REG_FMT " S2: " REG_FMT "\n",
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regs->a6, regs->a7, regs->s2);
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printf("S3: " REG_FMT " S4: " REG_FMT " S5: " REG_FMT "\n",
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regs->s3, regs->s4, regs->s5);
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printf("S6: " REG_FMT " S7: " REG_FMT " S8: " REG_FMT "\n",
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regs->s6, regs->s7, regs->s8);
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printf("S9: " REG_FMT " S10: " REG_FMT " S11: " REG_FMT "\n",
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regs->s9, regs->s10, regs->s11);
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printf("T3: " REG_FMT " T4: " REG_FMT " T5: " REG_FMT "\n",
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regs->t3, regs->t4, regs->t5);
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printf("T6: " REG_FMT "\n", 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 " TVAL: " REG_FMT "\n", epc, tval);
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show_regs(regs);
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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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