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feat(esp8266): Add panic function when crash

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Dong Heng
2018-04-26 17:48:13 +08:00
committed by Wu Jian Gang
parent 1ff0028252
commit 632af7388e
3 changed files with 183 additions and 2 deletions
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133
components/esp8266/source/panic.c Normal file
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@ -0,0 +1,133 @@
// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include "c_types.h"
#include "esp8266/ets_sys.h"
#include "esp8266/eagle_soc.h"
#include "esp8266/uart_register.h"
/*
* Todo: panic output UART ID, we may add it to 'kconfig' to select target UART.
*/
#define PANIC_UART 0
/*
* @brief output a character
*
* @param c a character
*
* @return none
*/
static IRAM_ATTR void panit_putc(char c)
{
while (1) {
uint32_t fifo_cnt = READ_PERI_REG(UART_STATUS(PANIC_UART)) & (UART_TXFIFO_CNT << UART_TXFIFO_CNT_S);
if ((fifo_cnt >> UART_TXFIFO_CNT_S & UART_TXFIFO_CNT) < 126)
break;
}
WRITE_PERI_REG(UART_FIFO(PANIC_UART) , c);
}
/*
* @brief output a left-aligned string
*
* @param s string pointer
* @param left_aligned left-aligned bytes
*
* @return none
*/
static IRAM_ATTR void panic_puts(const char *s, int left_aligned)
{
int bytes = left_aligned - strlen(s);
while (bytes-- > 0)
panit_putc(' ');
while (*s)
panit_putc(*s++);
}
/*
* @brief output a hex value string of 32-bites data
*
* @param hex 32-bites data
*
* @return none
*/
static IRAM_ATTR void panic_puthex(int hex)
{
char buf[8];
int bytes = 0;
while (bytes < 8) {
char c = (uint32_t)hex % 16;
if (c < 10)
c = c + '0';
else
c = c - 10 + 'a';
buf[bytes++] = c;
hex >>= 4;
}
while (bytes)
panit_putc(buf[--bytes]);
}
/*
* @brief output xtensa register value map when crash
*
* @param frame xtensa register value map pointer
*
* @return none
*/
void IRAM_ATTR panicHandler(void *frame)
{
int *regs = (int *)frame;
int x, y;
const char *sdesc[] = {
"PC", "PS", "A0", "A1",
"A2", "A3", "A4", "A5",
"A6", "A7", "A8", "A9",
"A10", "A11", "A12", "A13",
"A14", "A15", "SAR", "EXCCAUSE"
};
/* NMI can interrupt exception. */
ETS_INTR_LOCK();
for (x = 0; x < 20; x += 4) {
for (y = 0; y < 4; y++) {
panic_puts(sdesc[x + y], 8);
panic_puts(": 0x", 0);
panic_puthex(regs[x + y + 1]);
panic_puts(" ", 0);
}
panit_putc('\n');
}
/*
* Todo: add more option to select here to 'Kconfig':
* 1. blocking
* 2. restart
* 3. GBD break
*/
while (1);
}

51
components/esp8266/source/xtensa_vectors.S
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@ -122,6 +122,9 @@ STRUCT_END(HighPriFrame)
#define PRI_N_STACK_SIZE 512 /* default to 1 kB stack for each level-N handling */
#define PRI_N_STACK_SIZE2 256 /* default to 1 kB stack for each level-N handling */
#define PANIC_STK_FRMSZ 0x60
.global panicHandler
// Allocate save area and stack:
// (must use .bss, not .comm, because the subsequent .set does not work otherwise)
@ -669,6 +672,8 @@ Double exceptions are not a normal occurrence. They indicate a bug of some kind.
.align 4
.literal_position
_DoubleExceptionVector:
wsr a0, EXCSAVE_1
j _xt_ext_panic
#if XCHAL_HAVE_DEBUG
break 1, 4 /* unhandled double exception */
@ -692,9 +697,9 @@ Kernel Exception (including Level 1 Interrupt from kernel mode).
.align 4
.literal_position
_KernelExceptionVector:
wsr a0, EXCSAVE_1 /* preserve a0 */
call0 _xt_kernel_exc /* kernel exception handler */
j _xt_ext_panic
/* never returns here - call0 is used as a jump (see note at top) */
.end literal_prefix
@ -768,7 +773,11 @@ _xt_user_exc:
#endif
beqi a0, EXCCAUSE_SYSCALL, _xt_to_syscall_exc
beqi a0, EXCCAUSE_LOAD_STORE_ERROR, LoadStoreErrorHandler
beqi a0, EXCCAUSE_LEVEL1INTERRUPT, _xt_user_entry1
j _xt_ext_panic
_xt_user_entry1:
/* Allocate interrupt stack frame and save minimal context. */
mov a0, sp /* sp == a1 */
addi sp, sp, -XT_STK_FRMSZ /* allocate interrupt stack frame */
@ -1395,3 +1404,41 @@ nmi_rfi:
rfi XCHAL_NMILEVEL
#endif
#endif /* NMI */
.global _xt_ext_panic
.type _xt_ext_panic, @function
.align 4
.literal_position
_xt_ext_panic:
/* Allocate exception frame and save minimal context. */
mov a0, sp
addi sp, sp, -XT_STK_FRMSZ
s32i a0, sp, XT_STK_A1
rsr a0, PS /* save interruptee's PS */
s32i a0, sp, XT_STK_PS
rsr a0, EPC_1 /* save interruptee's PC */
s32i a0, sp, XT_STK_PC
s32i a12, sp, XT_STK_A12 /* _xt_context_save requires A12- */
s32i a13, sp, XT_STK_A13 /* A13 to have already been saved */
s32i a14, sp, XT_STK_A14
s32i a15, sp, XT_STK_A15
call0 _xt_context_save
/* Save exc cause and vaddr into exception frame */
rsr a0, EXCCAUSE
s32i a0, sp, XT_STK_EXCCAUSE
/* _xt_context_save seems to save the current a0, but we need the interuptees a0. Fix this. */
rsr a0, EXCSAVE_1 /* save interruptee's a0 */
s32i a0, sp, XT_STK_A0
/* Set up PS for C, disable all interrupts except NMI and debug, and clear EXCM. */
movi a0, PS_INTLEVEL(5) | PS_UM | PS_WOE
wsr a0, PS
//Call panic handler
mov a2, sp
call0 panicHandler