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/* Copyright 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "console.h"
#include "cpu.h"
#include "hooks.h"
#include "host_command.h"
#include "panic.h"
#include "printf.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "uart.h"
#include "util.h"
/* Panic data goes at the end of RAM. */
static struct panic_data * const pdata_ptr = PANIC_DATA_PTR;
/**
* Add a character directly to the UART buffer.
*
* @param context Context; ignored.
* @param c Character to write.
* @return 0 if the character was transmitted, 1 if it was dropped.
*/
#ifndef CONFIG_DEBUG_PRINTF
static int panic_txchar(void *context, int c)
{
if (c == '\n')
panic_txchar(context, '\r');
/* Wait for space in transmit FIFO */
while (!uart_tx_ready())
;
/* Write the character directly to the transmit FIFO */
uart_write_char(c);
return 0;
}
void panic_puts(const char *outstr)
{
/* Flush the output buffer */
uart_flush_output();
/* Put all characters in the output buffer */
while (*outstr)
panic_txchar(NULL, *outstr++);
/* Flush the transmit FIFO */
uart_tx_flush();
}
void panic_printf(const char *format, ...)
{
va_list args;
/* Flush the output buffer */
uart_flush_output();
va_start(args, format);
vfnprintf(panic_txchar, NULL, format, args);
va_end(args);
/* Flush the transmit FIFO */
uart_tx_flush();
}
#endif
/**
* Display a message and reboot
*/
void panic_reboot(void)
{
panic_puts("\n\nRebooting...\n");
system_reset(0);
}
#ifdef CONFIG_DEBUG_ASSERT_REBOOTS
#ifdef CONFIG_DEBUG_ASSERT_BRIEF
void panic_assert_fail(const char *fname, int linenum)
{
panic_printf("\nASSERTION FAILURE at %s:%d\n", fname, linenum);
#ifdef CONFIG_SOFTWARE_PANIC
software_panic(PANIC_SW_ASSERT, linenum);
#else
panic_reboot();
#endif
}
#else
void panic_assert_fail(const char *msg, const char *func, const char *fname,
int linenum)
{
panic_printf("\nASSERTION FAILURE '%s' in %s() at %s:%d\n",
msg, func, fname, linenum);
#ifdef CONFIG_SOFTWARE_PANIC
software_panic(PANIC_SW_ASSERT, linenum);
#else
panic_reboot();
#endif
}
#endif
#endif
void panic(const char *msg)
{
panic_printf("\n** PANIC: %s\n", msg);
panic_reboot();
}
struct panic_data *panic_get_data(void)
{
return pdata_ptr->magic == PANIC_DATA_MAGIC ? pdata_ptr : NULL;
}
static void panic_init(void)
{
#ifdef CONFIG_HOSTCMD_EVENTS
struct panic_data *addr = panic_get_data();
/* Notify host of new panic event */
if (addr && !(addr->flags & PANIC_DATA_FLAG_OLD_HOSTEVENT)) {
host_set_single_event(EC_HOST_EVENT_PANIC);
addr->flags |= PANIC_DATA_FLAG_OLD_HOSTEVENT;
}
#endif
}
DECLARE_HOOK(HOOK_INIT, panic_init, HOOK_PRIO_DEFAULT);
#ifdef CONFIG_CMD_STACKOVERFLOW
static void stack_overflow_recurse(int n)
{
ccprintf("+%d", n);
/*
* Force task context switch, since that's where we do stack overflow
* checking.
*/
msleep(10);
stack_overflow_recurse(n+1);
/*
* Do work after the recursion, or else the compiler uses tail-chaining
* and we don't actually consume additional stack.
*/
ccprintf("-%d", n);
}
#endif /* CONFIG_CMD_STACKOVERFLOW */
/*****************************************************************************/
/* Console commands */
#ifdef CONFIG_CMD_CRASH
static int command_crash(int argc, char **argv)
{
if (argc < 2)
return EC_ERROR_PARAM1;
if (!strcasecmp(argv[1], "assert")) {
ASSERT(0);
} else if (!strcasecmp(argv[1], "divzero")) {
volatile int zero = 0;
cflush();
ccprintf("%08x", 1 / zero);
} else if (!strcasecmp(argv[1], "udivzero")) {
volatile int zero = 0;
cflush();
ccprintf("%08x", 1 / zero);
#ifdef CONFIG_CMD_STACKOVERFLOW
} else if (!strcasecmp(argv[1], "stack")) {
stack_overflow_recurse(1);
#endif
} else if (!strcasecmp(argv[1], "unaligned")) {
volatile intptr_t unaligned_ptr = 0xcdef;
cflush();
ccprintf("%08x", *(volatile int *)unaligned_ptr);
} else if (!strcasecmp(argv[1], "watchdog")) {
while (1)
;
} else if (!strcasecmp(argv[1], "hang")) {
interrupt_disable();
while (1)
;
} else {
return EC_ERROR_PARAM1;
}
/* Everything crashes, so shouldn't get back here */
return EC_ERROR_UNKNOWN;
}
DECLARE_CONSOLE_COMMAND(crash, command_crash,
"[assert | divzero | udivzero"
#ifdef CONFIG_CMD_STACKOVERFLOW
" | stack"
#endif
" | unaligned | watchdog | hang]",
"Crash the system (for testing)");
#endif
static int command_panicinfo(int argc, char **argv)
{
if (pdata_ptr->magic == PANIC_DATA_MAGIC) {
ccprintf("Saved panic data:%s\n",
(pdata_ptr->flags & PANIC_DATA_FLAG_OLD_CONSOLE ?
"" : " (NEW)"));
panic_data_print(pdata_ptr);
/* Data has now been printed */
pdata_ptr->flags |= PANIC_DATA_FLAG_OLD_CONSOLE;
} else {
ccprintf("No saved panic data available.\n");
}
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(panicinfo, command_panicinfo,
NULL,
"Print info from a previous panic");
/*****************************************************************************/
/* Host commands */
enum ec_status host_command_panic_info(struct host_cmd_handler_args *args)
{
if (pdata_ptr->magic == PANIC_DATA_MAGIC) {
ASSERT(pdata_ptr->struct_size <= args->response_max);
memcpy(args->response, pdata_ptr, pdata_ptr->struct_size);
args->response_size = pdata_ptr->struct_size;
/* Data has now been returned */
pdata_ptr->flags |= PANIC_DATA_FLAG_OLD_HOSTCMD;
}
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_GET_PANIC_INFO,
host_command_panic_info,
EC_VER_MASK(0));
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