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/*! \file include/setjmp.h
\brief Non-local goto as specified in ANSI C
\author Torsten Landschoff <tla@informatik.uni-kiel.de>
*/
/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License
* at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and
* limitations under the License.
*
*/
#ifndef __setjmp_h__
#define __setjmp_h__
#ifdef __cplusplus
extern "C" {
#endif
#include <config.h>
#ifdef CONF_SETJMP
/*----[ Data type definitions ]-----------------------------------------*/
//! Information stored for non-local jumps
/*!
* Stores the machine status for non-local jumps.
* The H8/300 CPU has the following state information:
* - 8 registers of 16 bit each (r0, r1, ..., r7)
* - the program counter
* - a condition code register of a single byte
* To allow execution of a longjmp we have to return to the state saved
* in a jmp_buf just like from a subroutine invocation. The machine
* description of gcc for the H8 says that r0,r1,r2,r3 are destroyed
* by a subroutine call. Therefore we need to save the condition code,
* the program counter of the caller (where we want to return), and the
* registers r4, r5, r6, r7. We are using 6 words for that and ignore
* a byte at restore time.
*/
typedef int jmp_buf[6];
/*----[ Function prototypes ]-------------------------------------------*/
//! Save execution context for non-local goto
/*!
* Records the current machine status for a non-local goto. The saved
* status will be invalidated when returning from the stack frame
* where it was set.
* @param env buffer for saved machine status
* @return 0 when returning directly (after saving the state), or
* whatever was given to longjmp when returning via a non-local goto
*/
extern int setjmp(jmp_buf env);
//! Non-local jump to saved machine context
/*!
* Restores a machine context as saved via setjmp.
* @param env the buffer of the saved machine status
* @param val the value to return from the setjmp function
*/
extern void longjmp(jmp_buf env, int val);
#endif // CONF_SETJMP
#ifdef __cplusplus
}
#endif
#endif // __setjmp_h__
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