| /****************************************************************************** |
| * * |
| * License Agreement * |
| * * |
| * Copyright (c) 2004 Altera Corporation, San Jose, California, USA. * |
| * All rights reserved. * |
| * * |
| * Permission is hereby granted, free of charge, to any person obtaining a * |
| * copy of this software and associated documentation files (the "Software"), * |
| * to deal in the Software without restriction, including without limitation * |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, * |
| * and/or sell copies of the Software, and to permit persons to whom the * |
| * Software is furnished to do so, subject to the following conditions: * |
| * * |
| * The above copyright notice and this permission notice shall be included in * |
| * all copies or substantial portions of the Software. * |
| * * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * |
| * DEALINGS IN THE SOFTWARE. * |
| * * |
| * * |
| ******************************************************************************/ |
| |
| #ifndef __ALT_STACK_H__ |
| #define __ALT_STACK_H__ |
| |
| /* |
| * alt_stack.h is the nios2 specific implementation of functions used by the |
| * stack overflow code. |
| */ |
| |
| #include "nios2.h" |
| |
| #include "alt_types.h" |
| |
| #ifdef __cplusplus |
| extern "C" |
| { |
| #endif /* __cplusplus */ |
| |
| |
| extern char * alt_stack_limit_value; |
| |
| #ifdef ALT_EXCEPTION_STACK |
| extern char __alt_exception_stack_pointer[]; /* set by the linker */ |
| #endif /* ALT_EXCEPTION_STACK */ |
| |
| |
| /* |
| * alt_stack_limit can be called to determine the current value of the stack |
| * limit register. |
| */ |
| |
| static ALT_INLINE char * ALT_ALWAYS_INLINE alt_stack_limit (void) |
| { |
| char * limit; |
| NIOS2_READ_ET(limit); |
| |
| return limit; |
| } |
| |
| /* |
| * alt_stack_pointer can be called to determine the current value of the stack |
| * pointer register. |
| */ |
| |
| static ALT_INLINE char * ALT_ALWAYS_INLINE alt_stack_pointer (void) |
| { |
| char * pointer; |
| NIOS2_READ_SP(pointer); |
| |
| return pointer; |
| } |
| |
| |
| #ifdef ALT_EXCEPTION_STACK |
| |
| /* |
| * alt_exception_stack_pointer returns the normal stack pointer from |
| * where it is stored on the exception stack (uppermost 4 bytes). This |
| * is really only useful during exception processing, and is only |
| * available if a separate exception stack has been configured. |
| */ |
| |
| static ALT_INLINE char * ALT_ALWAYS_INLINE alt_exception_stack_pointer (void) |
| { |
| return (char *) *(alt_u32 *)(__alt_exception_stack_pointer - sizeof(alt_u32)); |
| } |
| |
| #endif /* ALT_EXCEPTION_STACK */ |
| |
| |
| /* |
| * alt_set_stack_limit can be called to update the current value of the stack |
| * limit register. |
| */ |
| |
| static ALT_INLINE void ALT_ALWAYS_INLINE alt_set_stack_limit (char * limit) |
| { |
| alt_stack_limit_value = limit; |
| NIOS2_WRITE_ET(limit); |
| } |
| |
| /* |
| * alt_report_stack_overflow reports that a stack overflow happened. |
| */ |
| |
| static ALT_INLINE void ALT_ALWAYS_INLINE alt_report_stack_overflow (void) |
| { |
| NIOS2_REPORT_STACK_OVERFLOW(); |
| } |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif /* __cplusplus */ |
| |
| #endif /* __ALT_STACK_H__ */ |
| |