/* * Copyright (c) 2010 Martin Decky * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** @addtogroup kernel_abs32le_interrupt * @{ */ /** @file */ #ifndef KERN_abs32le_ISTATE_H_ #define KERN_abs32le_ISTATE_H_ #include <trace.h> #ifdef KERNEL #include <typedefs.h> #include <verify.h> #else /* KERNEL */ #include <stdint.h> #define REQUIRES_EXTENT_MUTABLE(arg) #define WRITES(arg) #endif /* KERNEL */ /* * On real hardware this stores the registers which * need to be preserved during interupts. */ typedef struct istate { uintptr_t ip; uintptr_t fp; uint32_t stack[]; } istate_t; _NO_TRACE static inline int istate_from_uspace(istate_t *istate) REQUIRES_EXTENT_MUTABLE(istate) { /* * On real hardware this checks whether the interrupted * context originated from user space. */ return !(istate->ip & UINT32_C(0x80000000)); } _NO_TRACE static inline void istate_set_retaddr(istate_t *istate, uintptr_t retaddr) WRITES(&istate->ip) { /* On real hardware this sets the instruction pointer. */ istate->ip = retaddr; } _NO_TRACE static inline uintptr_t istate_get_pc(istate_t *istate) REQUIRES_EXTENT_MUTABLE(istate) { /* On real hardware this returns the instruction pointer. */ return istate->ip; } _NO_TRACE static inline uintptr_t istate_get_fp(istate_t *istate) REQUIRES_EXTENT_MUTABLE(istate) { /* On real hardware this returns the frame pointer. */ return istate->fp; } #endif /** @} */