mirror of
https://github.com/brain-hackers/u-boot-brain
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c48e9f310b
The gp register is used to store U-Boot's global data pointer. We should not assume that an UEFI application leaves the gp register unchanged as the UEFI specifications does not define who is the owner of the gp and tp registers. So the following sequence should be followed in the trap handler: * save the caller's gp register * restore the global data pointer * serve interrupts or print crash dump and reset * restore the caller's gp register Cc: Abner Chang <abner.chang@hpe.com> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: Bin Meng <bin.meng@windriver.com> Reviewed-by: Rick Chen <rick@andestech.com>
151 lines
3.7 KiB
C
151 lines
3.7 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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/* An UEFI application may have changed gd. Restore U-Boot's gd. */
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efi_restore_gd();
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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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