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/* Copyright (c) 2012 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.
*
* Panic handling, including displaying a message on the panic reporting
* device, which is currently the UART.
*/
#ifndef __CROS_EC_PANIC_H
#define __CROS_EC_PANIC_H
#include "software_panic.h"
#include <stdarg.h>
/* ARM Cortex-Mx registers saved on panic */
struct cortex_panic_data {
uint32_t regs[12]; /* psp, ipsr, msp, r4-r11, lr(=exc_return).
* In version 1, that was uint32_t regs[11] =
* psp, ipsr, lr, r4-r11
*/
uint32_t frame[8]; /* r0-r3, r12, lr, pc, xPSR */
uint32_t mmfs;
uint32_t bfar;
uint32_t mfar;
uint32_t shcsr;
uint32_t hfsr;
uint32_t dfsr;
};
/* NDS32 N8 registers saved on panic */
struct nds32_n8_panic_data {
uint32_t itype;
uint32_t regs[16]; /* r0-r10, r15, fp, gp, lp, sp */
uint32_t ipc;
uint32_t ipsw;
};
/* Data saved across reboots */
struct panic_data {
uint8_t arch; /* Architecture (PANIC_ARCH_*) */
uint8_t struct_version; /* Structure version (currently 2) */
uint8_t flags; /* Flags (PANIC_DATA_FLAG_*) */
uint8_t reserved; /* Reserved; set 0 */
/* core specific panic data */
union {
struct cortex_panic_data cm; /* Cortex-Mx registers */
struct nds32_n8_panic_data nds_n8; /* NDS32 N8 registers */
};
/*
* These fields go at the END of the struct so we can find it at the
* end of memory.
*/
uint32_t struct_size; /* Size of this struct */
uint32_t magic; /* PANIC_SAVE_MAGIC if valid */
};
#define PANIC_DATA_MAGIC 0x21636e50 /* "Pnc!" */
enum panic_arch {
PANIC_ARCH_CORTEX_M = 1, /* Cortex-M architecture */
PANIC_ARCH_NDS32_N8 = 2, /* NDS32 N8 architecture */
};
/*
* Panic data goes at the end of RAM. This is safe because we don't context
* switch away from the panic handler before rebooting, and stacks and data
* start at the beginning of RAM.
*/
#define PANIC_DATA_PTR ((struct panic_data *)\
(CONFIG_RAM_BASE + CONFIG_RAM_SIZE - sizeof(struct panic_data)))
/* Flags for panic_data.flags */
/* panic_data.frame is valid */
#define PANIC_DATA_FLAG_FRAME_VALID (1 << 0)
/* Already printed at console */
#define PANIC_DATA_FLAG_OLD_CONSOLE (1 << 1)
/* Already returned via host command */
#define PANIC_DATA_FLAG_OLD_HOSTCMD (1 << 2)
/* Already reported via host event */
#define PANIC_DATA_FLAG_OLD_HOSTEVENT (1 << 3)
/* The data was truncated to fit panic info host cmd */
#define PANIC_DATA_FLAG_TRUNCATED (1 << 4)
/**
* Write a string to the panic reporting device
*
* This function will not return until the string has left the UART
* data register. Any previously queued UART traffic is displayed first.
*
* @param ch Character to write
*/
void panic_puts(const char *s);
/**
* Very basic printf() for use in panic situations
*
* See panic_vprintf() for full details
*
* @param format printf-style format string
* @param ... Arguments to process
*/
void panic_printf(const char *format, ...);
/*
* Print saved panic information
*
* @param pdata pointer to saved panic data
*/
void panic_data_print(const struct panic_data *pdata);
/**
* Report an assertion failure and reset
*
* @param msg Assertion expression or other message
* @param func Function name where assertion happened
* @param fname File name where assertion happened
* @param linenum Line number where assertion happened
*/
#ifdef CONFIG_DEBUG_ASSERT_BRIEF
void panic_assert_fail(const char *fname, int linenum)
__attribute__((noreturn));
#else
void panic_assert_fail(const char *msg, const char *func, const char *fname,
int linenum) __attribute__((noreturn));
#endif
/**
* Display a custom panic message and reset
*
* @param msg Panic message
*/
void panic(const char *msg) __attribute__((noreturn));
/**
* Display a default message and reset
*/
void panic_reboot(void) __attribute__((noreturn));
#ifdef CONFIG_SOFTWARE_PANIC
/**
* Store a panic log and halt the system for a software-related reason, such as
* stack overflow or assertion failure.
*/
void software_panic(uint32_t reason, uint32_t info) __attribute__((noreturn));
/**
* Log a panic in the panic log, but don't halt the system. Normally
* called on the subsequent reboot after panic detection.
*/
void panic_set_reason(uint32_t reason, uint32_t info, uint8_t exception);
/**
* Retrieve the currently stored panic reason + info.
*/
void panic_get_reason(uint32_t *reason, uint32_t *info, uint8_t *exception);
#endif
/**
* Enable/disable bus fault handler
*
* @param ignored Non-zero if ignoring bus fault
*/
void ignore_bus_fault(int ignored);
/**
* Return a pointer to the saved data from a previous panic.
*
* @param pointer to the panic data, or NULL if none available (for example,
* the last reboot was not caused by a panic).
*/
struct panic_data *panic_get_data(void);
/**
* Chip-specific implementation for backing up panic data to persistent
* storage. This function is used to ensure that the panic data can survive loss
* of VCC power rail.
*
* There is no generic restore function provided since every chip can decide
* when it is safe to restore panic data during the system initialization step.
*/
void chip_panic_data_backup(void);
#endif /* __CROS_EC_PANIC_H */
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