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riscv: Add option to print registers on exception

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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>
This commit is contained in:
Sean Anderson 2019-12-25 00:27:44 -05:00 committed by Andes
parent d9f1cee286
commit fd1f6e9a0b
3 changed files with 44 additions and 12 deletions
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3
arch/riscv/Kconfig
View file

@ -222,6 +222,9 @@ config XIP
from a NOR flash memory without copying the code to ram.
Say yes here if U-Boot boots from flash directly.
config SHOW_REGS
bool "Show registers on unhandled exception"
config STACK_SIZE_SHIFT
int
default 14

3
arch/riscv/cpu/mtrap.S
View file

@ -64,7 +64,8 @@ trap_entry:
SREG x31, 31 * REGBYTES(sp)
csrr a0, MODE_PREFIX(cause)
csrr a1, MODE_PREFIX(epc)
mv a2, sp
csrr a2, MODE_PREFIX(tval)
mv a3, sp
jal handle_trap
csrw MODE_PREFIX(epc), a0

50
arch/riscv/lib/interrupts.c
View file

@ -5,6 +5,8 @@
*
* Copyright (C) 2017 Andes Technology Corporation
* Rick Chen, Andes Technology Corporation <rick@andestech.com>
*
* Copyright (C) 2019 Sean Anderson <seanga2@gmail.com>
*/
#include <common.h>
@ -14,7 +16,34 @@
#include <asm/system.h>
#include <asm/encoding.h>
static void _exit_trap(ulong code, ulong epc, struct pt_regs *regs)
static void show_regs(struct pt_regs *regs)
{
#ifdef CONFIG_SHOW_REGS
printf("RA: " REG_FMT " SP: " REG_FMT " GP: " REG_FMT "\n",
regs->ra, regs->sp, regs->gp);
printf("TP: " REG_FMT " T0: " REG_FMT " T1: " REG_FMT "\n",
regs->tp, regs->t0, regs->t1);
printf("T2: " REG_FMT " S0: " REG_FMT " S1: " REG_FMT "\n",
regs->t2, regs->s0, regs->s1);
printf("A0: " REG_FMT " A1: " REG_FMT " A2: " REG_FMT "\n",
regs->a0, regs->a1, regs->a2);
printf("A3: " REG_FMT " A4: " REG_FMT " A5: " REG_FMT "\n",
regs->a3, regs->a4, regs->a5);
printf("A6: " REG_FMT " A7: " REG_FMT " S2: " REG_FMT "\n",
regs->a6, regs->a7, regs->s2);
printf("S3: " REG_FMT " S4: " REG_FMT " S5: " REG_FMT "\n",
regs->s3, regs->s4, regs->s5);
printf("S6: " REG_FMT " S7: " REG_FMT " S8: " REG_FMT "\n",
regs->s6, regs->s7, regs->s8);
printf("S9: " REG_FMT " S10: " REG_FMT " S11: " REG_FMT "\n",
regs->s9, regs->s10, regs->s11);
printf("T3: " REG_FMT " T4: " REG_FMT " T5: " REG_FMT "\n",
regs->t3, regs->t4, regs->t5);
printf("T6: " REG_FMT "\n", regs->t6);
#endif
}
static void _exit_trap(ulong code, ulong epc, ulong tval, struct pt_regs *regs)
{
static const char * const exception_code[] = {
"Instruction address misaligned",
@ -35,14 +64,13 @@ static void _exit_trap(ulong code, ulong epc, struct pt_regs *regs)
"Store/AMO page fault",
};
if (code < ARRAY_SIZE(exception_code)) {
printf("exception code: %ld , %s , epc %lx , ra %lx\n",
code, exception_code[code], epc, regs->ra);
} else {
printf("reserved exception code: %ld , epc %lx , ra %lx\n",
code, epc, regs->ra);
}
if (code < ARRAY_SIZE(exception_code))
printf("Unhandled exception: %s\n", exception_code[code]);
else
printf("Unhandled exception code: %ld\n", code);
printf("EPC: " REG_FMT " TVAL: " REG_FMT "\n", epc, tval);
show_regs(regs);
hang();
}
@ -66,7 +94,7 @@ int disable_interrupts(void)
return 0;
}
ulong handle_trap(ulong cause, ulong epc, struct pt_regs *regs)
ulong handle_trap(ulong cause, ulong epc, ulong tval, struct pt_regs *regs)
{
ulong is_irq, irq;
@ -84,11 +112,11 @@ ulong handle_trap(ulong cause, ulong epc, struct pt_regs *regs)
timer_interrupt(0); /* handle timer interrupt */
break;
default:
_exit_trap(cause, epc, regs);
_exit_trap(cause, epc, tval, regs);
break;
};
} else {
_exit_trap(cause, epc, regs);
_exit_trap(cause, epc, tval, regs);
}
return epc;