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74c34bbad4
CPU creates an exception frame on the main stack instead of the process stack when the exception happens in a handler's context. So, we need to save both msp and psp, and pick the right one to locate the exception frame. Tested by marking the stack (as you see in the dump below) then triggering divzero in svc_handler. > crash svc === HANDLER EXCEPTION: 03 ====== xPSR: 6100000b === r0 :00000000 r1 :0000e237 r2 :000015cf r3 :000015cf r4 :00000001 r5 :22222222 r6 :11111111 r7 :0000df01 r8 :00000000 r9 :2000545e r10:00000000 r11:00000000 r12:0000000d sp :20000fb8 lr :000055d7 pc :00000b40 Divide by 0, Forced hard fault mmfs = 2000000, shcsr = 70080, hfsr = 40000000, dfsr = 0 =========== Process Stack Contents =========== 20002738: 11111111 22222222 33333333 44444444 20002748: 00000000 000003ad 000003c0 81000000 20002758: 00000000 0000557d 0000557c 21000000 20002768: 00000000 00000000 00000000 00000000 Rebooting... BUG=chrome-os-partner:16901 BRANCH=none TEST=mentioned above Change-Id: I3ca08a1df20375953552b3dc926350e262b78b2a Signed-off-by: Daisuke Nojiri <dnojiri@google.com> Reviewed-on: https://gerrit.chromium.org/gerrit/47495 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Panic handling, including displaying a message on the panic reporting
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* device, which is currently the UART.
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*/
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#ifndef __CROS_EC_PANIC_H
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#define __CROS_EC_PANIC_H
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#include <stdarg.h>
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/* Data saved across reboots */
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struct panic_data {
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uint8_t arch; /* Architecture (PANIC_ARCH_*) */
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uint8_t struct_version; /* Structure version (currently 1) */
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uint8_t flags; /* Flags (PANIC_DATA_FLAG_*) */
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uint8_t reserved; /* Reserved; set 0 */
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uint32_t regs[12]; /* psp, ipsr, msp, r4-r11, lr(=exc_return) */
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uint32_t frame[8]; /* r0-r3, r12, lr, pc, xPSR */
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uint32_t mmfs;
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uint32_t bfar;
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uint32_t mfar;
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uint32_t shcsr;
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uint32_t hfsr;
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uint32_t dfsr;
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/*
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* These fields go at the END of the struct so we can find it at the
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* end of memory.
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*/
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uint32_t struct_size; /* Size of this struct */
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uint32_t magic; /* PANIC_SAVE_MAGIC if valid */
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};
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#define PANIC_DATA_MAGIC 0x21636e50 /* "Pnc!" */
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#define PANIC_ARCH_CORTEX_M 1 /* Cortex-M architecture */
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/* Flags for panic_data.flags */
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/* panic_data.frame is valid */
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#define PANIC_DATA_FLAG_FRAME_VALID (1 << 0)
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/* Already printed at console */
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#define PANIC_DATA_FLAG_OLD_CONSOLE (1 << 1)
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/* Already returned via host command */
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#define PANIC_DATA_FLAG_OLD_HOSTCMD (1 << 2)
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/**
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* Write a string to the panic reporting device
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*
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* This function will not return until the string has left the UART
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* data register. Any previously queued UART traffic is displayed first.
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*
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* @param ch Character to write
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*/
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void panic_puts(const char *s);
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/**
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* Very basic printf() for use in panic situations
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*
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* See panic_vprintf() for full details
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*
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* @param format printf-style format string
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* @param ... Arguments to process
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*/
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void panic_printf(const char *format, ...);
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/**
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* Report an assertion failure and reset
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*
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* @param msg Assertion expression or other message
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* @param func Function name where assertion happened
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* @param fname File name where assertion happened
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* @param linenum Line number where assertion happened
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*/
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void panic_assert_fail(const char *msg, const char *func, const char *fname,
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int linenum);
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/**
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* Display a panic message and reset
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*
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* @param msg Panic message
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*/
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void panic(const char *msg);
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/**
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* Enable/disable bus fault handler
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*
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* @param ignored Non-zero if ignoring bus fault
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*/
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void ignore_bus_fault(int ignored);
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/**
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* Return a pointer to the saved data from a previous panic.
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*
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* @param pointer to the panic data, or NULL if none available (for example,
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* the last reboot was not caused by a panic).
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*/
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struct panic_data *panic_get_data(void);
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#endif /* __CROS_EC_PANIC_H */
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