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https://github.com/CTCaer/switch-l4t-atf.git
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07f4e078b6
This patch introduces the reworked exception handling logic which lays the foundation for accessing runtime services in later patches. The type of an exception has a greater say in the way it is handled. SP_EL3 is used as the stack pointer for: 1. Determining the type of exception and handling the unexpected ones on the exception stack 2. Saving and restoring the essential general purpose and system register state after exception entry and prior to exception exit. SP_EL0 is used as the stack pointer for handling runtime service requests e.g. SMCs. A new structure for preserving general purpose register state has been added to the 'cpu_context' structure. All assembler ensures that it does not use callee saved registers (x19-x29). The C runtime preserves them across functions calls. Hence EL3 code does not have to save and restore them explicitly. Since the exception handling framework has undergone substantial change, the changes have been kept in separate files to aid readability. These files will replace the existing ones in subsequent patches. Change-Id: Ice418686592990ff7a4260771e8d6676e6c8c5ef
71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __DEBUG_H__
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#define __DEBUG_H__
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/* Do not try to call this from ASM code. */
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#ifndef __ASSEMBLY__
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#include <stdio.h>
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/* If building the project with DEBUG disabled the INFO and WARN macros
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* won't produce any output. The ERROR macro is always enabled.
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* The format expected is the same as for printf().
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* INFO("Info %s.\n", "message") -> INFO: Info message.
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* WARN("Warning %s.\n", "message") -> WARN: Warning message.
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* ERROR("Error %s.\n", "message") -> ERROR: Error message.
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*
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* TODO : add debug levels.
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*/
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#if DEBUG
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#define INFO(...) printf("INFO: " __VA_ARGS__)
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#define WARN(...) printf("WARN: " __VA_ARGS__)
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#else
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#define INFO(...)
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#define WARN(...)
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#endif
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#define ERROR(...) printf("ERROR: " __VA_ARGS__)
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/* For the moment this Panic function is very basic, Report an error and
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* spin. This can be expanded in the future to provide more information.
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*/
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static inline void __attribute__((noreturn)) panic(void)
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{
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ERROR("PANIC\n");
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while (1)
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;
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}
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#endif /* __ASSEMBLY__ */
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#endif /* __DEBUG_H__ */
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