159 lines
6.9 KiB
C
159 lines
6.9 KiB
C
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/* Copyright (C) 2018 Adam Green (https://github.com/adamgreen)
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef _CRASH_CATCHER_H_
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#define _CRASH_CATCHER_H_
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#include <stdint.h>
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#include <stdlib.h>
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#define TRUE 1
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#define FALSE 0
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/* The crash dump start with a four byte header. The first two bytes are "cC", the third byte is the major version
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number, and the fourth bytes is the minor version number. */
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#define CRASH_CATCHER_SIGNATURE_BYTE0 'c'
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#define CRASH_CATCHER_SIGNATURE_BYTE1 'C'
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#define CRASH_CATCHER_VERSION_MAJOR 3
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#define CRASH_CATCHER_VERSION_MINOR 0
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/* The second word of the dump contains flags. These are the allowed flags. */
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/* Flag to indicate that 32 single-precision floating point registers and FPSCR will follow integer registers. */
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#define CRASH_CATCHER_FLAGS_FLOATING_POINT (1 << 0)
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/* This magic value will be found as the last word in a crash dump if the fault handler overflowed the stack while
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generating the crash dump. */
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#define CRASH_CATCHER_STACK_SENTINEL 0xACCE55ED
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/* Particulars of crash provided to CrashCatcher_DumpStart(). */
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typedef struct
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{
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/* The SP, Stack Pointer, contained this value at the time of the fault. */
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uint32_t sp;
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/* Was this fault actually just a hardcoded breakpoint from which it is safe to continue. */
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int isBKPT;
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} CrashCatcherInfo;
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/* The crash dump will have one of these entries for each memory region included in the dump file. */
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typedef struct
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{
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uint32_t startAddress;
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uint32_t endAddress;
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} CrashCatcherMemoryRegionInfo;
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/* Supported element sizes to be used with CrashCatcher_DumpMemory calls. */
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typedef enum
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{
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CRASH_CATCHER_BYTE = 1,
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CRASH_CATCHER_HALFWORD = 2,
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CRASH_CATCHER_WORD = 4
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} CrashCatcherElementSizes;
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/* Codes to be returned from an implementation's CrashCathcer_DumpEnd() handler. */
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typedef enum
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{
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/* Crash Catcher should loop around and try dumping again incase user missed it previous time. */
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CRASH_CATCHER_TRY_AGAIN = 0,
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/* Crash Catcher should exit and return to caller. This is used during unit testing or if the crash cause was
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actually a hardcoded breakpoint that should be logged and then execution continued. */
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CRASH_CATCHER_EXIT
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} CrashCatcherReturnCodes;
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/* An array of these structures is returned from CrashCatcher_GetMemoryRegions() to indicate what regions of memory
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should be dumped as part of the crash dump. The last entry should contain a starting address of 0xFFFFFFFF to
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indicate that the end of the list has been encountered. */
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typedef struct
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{
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/* The first address of the element to be dumped for this region of memory. */
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/* The last region in the array return from CrashCatcher_GetMemoryRegions() must set this to 0xFFFFFFFF */
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uint32_t startAddress;
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/* Stop dumping the region once this address is encountered. The dump isn't inclusive of this address. */
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/* It must be greater than startAddress. */
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uint32_t endAddress;
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/* This should be set to CRASH_CATCHER_BYTE except for peripheral registers which don't support 8-bit reads. */
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CrashCatcherElementSizes elementSize;
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} CrashCatcherMemoryRegion;
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* The following functions must be provided by a specific dumping implementation. The Core CrashCatcher calls these
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routines to have an implementation dump the bytes associated with the current crash. */
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/* Called at the beginning of crash dump. You should provide an implementation which prepares for the dump by opening
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a dump file, prompting the user to begin a crash dump, or whatever makes sense for your scenario. */
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int CrashCatcher_DumpStart(const CrashCatcherInfo* pInfo);
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/* Called to obtain an array of regions in memory that should be dumped as part of the crash. This will typically
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be all RAM regions that contain volatile data. For some crash scenarios, a user may decide to also add peripheral
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registers of interest (ie. dump some ethernet registers when you are encountering crashes in the network stack.)
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If NULL is returned from this function, the core will only dump the registers. */
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const CrashCatcherMemoryRegion* CrashCatcher_GetMemoryRegions(void);
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/* Called to dump the next chunk of memory to the dump (this memory may point to register contents which has been copied
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to memory by CrashCatcher already. The element size will be 8-bits, 16-bits, or 32-bits. The implementation should
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use reads of the specified size since some memory locations may only support the indicated size. */
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void CrashCatcher_DumpMemory(const void* pvMemory, CrashCatcherElementSizes elementSize, size_t elementCount);
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/* Called at the end of crash dump. You should provide an implementation which cleans up at the end of dump. This could
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include closing a dump file, blinking LEDs, infinite looping, and/or returning CRASH_CATCHER_TRY_AGAIN if
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CrashCatcher should prepare to dump again incase user missed the first attempt. */
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CrashCatcherReturnCodes CrashCatcher_DumpEnd(void);
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/* The following functions must be provided by a hex dumping implementation. Such implementations will also have to
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implement the core CrashCatcher_GetMemoryRegions() API as well. The HexDump version of CrashCatcher calls these
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routines to have an implementation query the user when they are ready for the dump to start and actually dump the
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hex data to the user a character at a time. */
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/* Called to receive a character of data from the user. Typically this is in response to a "Press any key" type of
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prompt to the user. This function should be blocking. */
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int CrashCatcher_getc(void);
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/* Called to send a character of hex dump data to the user. */
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void CrashCatcher_putc(char c);
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#ifdef __cplusplus
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}
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#endif
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/* Macros which can generate a few forms of crashes. */
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#define CRASH_CATCHER_READ_FAULT() (*(volatile unsigned int*)0xFFFFFFF0)
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#define CRASH_CATCHER_WRITE_FAULT() (*(volatile unsigned int*)0xFFFFFFF0 = 0x0)
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#define CRASH_CATCHER_INVALID_INSTRUCTION() { __asm volatile (".word 0xDE00"); }
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/* Macro used to insert hardcoded breakpoint into user's code. */
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#define CRASH_CATCHER_BREAKPOINT() { __asm volatile ("bkpt #0"); }
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/* Macro used to make some globals writeable from unit tests but constant when running on ARM processors. */
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#ifdef RUNNING_HOST_TESTS
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#define CRASH_CATCHER_TEST_WRITEABLE
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#else
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#define CRASH_CATCHER_TEST_WRITEABLE static const
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#endif
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#endif /* _CRASH_CATCHER_H_ */
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