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riscv: additional crash information

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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>
This commit is contained in:
Heinrich Schuchardt 2020-08-01 15:15:39 +00:00 committed by Andes
parent db3585d181
commit 7c6ca03eae
1 changed files with 35 additions and 22 deletions
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57
arch/riscv/lib/interrupts.c
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@ -10,36 +10,43 @@
*/ */
#include <common.h> #include <common.h>
#include <efi_loader.h>
#include <hang.h> #include <hang.h>
#include <irq_func.h> #include <irq_func.h>
#include <asm/ptrace.h> #include <asm/ptrace.h>
#include <asm/system.h> #include <asm/system.h>
#include <asm/encoding.h> #include <asm/encoding.h>
DECLARE_GLOBAL_DATA_PTR;
static void show_efi_loaded_images(uintptr_t epc)
{
efi_print_image_infos((void *)epc);
}
static void show_regs(struct pt_regs *regs) static void show_regs(struct pt_regs *regs)
{ {
#ifdef CONFIG_SHOW_REGS #ifdef CONFIG_SHOW_REGS
printf("RA: " REG_FMT " SP: " REG_FMT " GP: " REG_FMT "\n", printf("SP: " REG_FMT " GP: " REG_FMT " TP: " REG_FMT "\n",
regs->ra, regs->sp, regs->gp); regs->sp, regs->gp, regs->tp);
printf("TP: " REG_FMT " T0: " REG_FMT " T1: " REG_FMT "\n", printf("T0: " REG_FMT " T1: " REG_FMT " T2: " REG_FMT "\n",
regs->tp, regs->t0, regs->t1); regs->t0, regs->t1, regs->t2);
printf("T2: " REG_FMT " S0: " REG_FMT " S1: " REG_FMT "\n", printf("S0: " REG_FMT " S1: " REG_FMT " A0: " REG_FMT "\n",
regs->t2, regs->s0, regs->s1); regs->s0, regs->s1, regs->a0);
printf("A0: " REG_FMT " A1: " REG_FMT " A2: " REG_FMT "\n", printf("A1: " REG_FMT " A2: " REG_FMT " A3: " REG_FMT "\n",
regs->a0, regs->a1, regs->a2); regs->a1, regs->a2, regs->a3);
printf("A3: " REG_FMT " A4: " REG_FMT " A5: " REG_FMT "\n", printf("A4: " REG_FMT " A5: " REG_FMT " A6: " REG_FMT "\n",
regs->a3, regs->a4, regs->a5); regs->a4, regs->a5, regs->a6);
printf("A6: " REG_FMT " A7: " REG_FMT " S2: " REG_FMT "\n", printf("A7: " REG_FMT " S2: " REG_FMT " S3: " REG_FMT "\n",
regs->a6, regs->a7, regs->s2); regs->a7, regs->s2, regs->s3);
printf("S3: " REG_FMT " S4: " REG_FMT " S5: " REG_FMT "\n", printf("S4: " REG_FMT " S5: " REG_FMT " S6: " REG_FMT "\n",
regs->s3, regs->s4, regs->s5); regs->s4, regs->s5, regs->s6);
printf("S6: " REG_FMT " S7: " REG_FMT " S8: " REG_FMT "\n", printf("S7: " REG_FMT " S8: " REG_FMT " S9: " REG_FMT "\n",
regs->s6, regs->s7, regs->s8); regs->s7, regs->s8, regs->s9);
printf("S9: " REG_FMT " S10: " REG_FMT " S11: " REG_FMT "\n", printf("S10: " REG_FMT " S11: " REG_FMT " T3: " REG_FMT "\n",
regs->s9, regs->s10, regs->s11); regs->s10, regs->s11, regs->t3);
printf("T3: " REG_FMT " T4: " REG_FMT " T5: " REG_FMT "\n", printf("T4: " REG_FMT " T5: " REG_FMT " T6: " REG_FMT "\n\n",
regs->t3, regs->t4, regs->t5); regs->t4, regs->t5, regs->t6);
printf("T6: " REG_FMT "\n", regs->t6);
#endif #endif
} }
@ -69,8 +76,14 @@ static void _exit_trap(ulong code, ulong epc, ulong tval, struct pt_regs *regs)
else else
printf("Unhandled exception code: %ld\n", code); printf("Unhandled exception code: %ld\n", code);
printf("EPC: " REG_FMT " TVAL: " REG_FMT "\n", epc, tval); printf("EPC: " REG_FMT " RA: " REG_FMT " TVAL: " REG_FMT "\n",
epc, regs->ra, tval);
if (gd->flags & GD_FLG_RELOC)
printf("EPC: " REG_FMT " RA: " REG_FMT " reloc adjusted\n\n",
epc - gd->reloc_off, regs->ra - gd->reloc_off);
show_regs(regs); show_regs(regs);
show_efi_loaded_images(epc);
hang(); hang();
} }