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/****************************************************************************
* arch/mips/src/mips/up_vfork.h
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
#ifndef __ARCH_MIPS_SRC_MIPS32_VFORK_H
#define __ARCH_MIPS_SRC_MIPS32_VFORK_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <arch/mips32/irq.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Register r30 may be a frame pointer in some ABIs. Or may just be saved
* register s8. It makes a difference for vfork handling.
*/
#undef VFORK_HAVE_FP
/* r0 zero Always has the value 0.
* r1 at Temporary generally used by assembler.
* r2-r3 v0-v1 Used for expression evaluations and to hold the integer and
* pointer type function return values.
* r4-r7 a0-a3 Used for passing arguments to functions; values are not
* preserved across function calls.
* r8-r15 t0-t7 Temporary registers used for expression evaluation; values
* are not preserved across function calls.
* r16-r23 s0-s7 Saved registers; values are preserved across function calls.
* r24-r25 t8-t9 Temporary registers used for expression evaluations; values
* are not preserved across function calls. When calling
* position independent functions r25 must contain the address
* of the called function.
* r26-r27 k0-k1 Used only by the operating system.
* r28 gp Global pointer and context pointer.
* r29 sp Stack pointer.
* r30 s8 Saved register (like s0-s7). If a frame pointer is used,
* then this is the frame pointer.
* r31 ra Return address.
*/
#define VFORK_S0_OFFSET (0*4) /* Saved register s0 */
#define VFORK_S1_OFFSET (1*4) /* Saved register s1 */
#define VFORK_S2_OFFSET (2*4) /* Saved register s2 */
#define VFORK_S3_OFFSET (3*4) /* Saved register s3 */
#define VFORK_S4_OFFSET (4*4) /* Saved register s4 */
#define VFORK_S5_OFFSET (5*4) /* Saved register s5 */
#define VFORK_S6_OFFSET (6*4) /* Saved register s6 */
#define VFORK_S7_OFFSET (7*4) /* Saved register s7 */
#ifdef CONFIG_MIPS32_FRAMEPOINTER
# define VFORK_FP_OFFSET (8*4) /* Frame pointer */
#else
# define VFORK_S8_OFFSET (8*4) /* Saved register s8 */
#endif
#define VFORK_SP_OFFSET (9*4) /* Stack pointer*/
#define VFORK_RA_OFFSET (10*4) /* Return address*/
#ifdef MIPS32_SAVE_GP
# define VFORK_GP_OFFSET (11*4) /* Global pointer */
# define VFORK_SIZEOF (12*4)
#else
# define VFORK_SIZEOF (11*4)
#endif
/****************************************************************************
* Public Types
****************************************************************************/
#ifndef __ASSEMBLY__
struct vfork_s
{
/* CPU registers */
uint32_t s0; /* Saved register s0 */
uint32_t s1; /* Saved register s1 */
uint32_t s2; /* Saved register s2 */
uint32_t s3; /* Saved register s3 */
uint32_t s4; /* Saved register s4 */
uint32_t s5; /* Saved register s5 */
uint32_t s6; /* Saved register s6 */
uint32_t s7; /* Saved register s7 */
#ifdef CONFIG_MIPS32_FRAMEPOINTER
uint32_t fp; /* Frame pointer */
#else
uint32_t s8; /* Saved register s8 */
#endif
uint32_t sp; /* Stack pointer*/
uint32_t ra; /* Return address*/
#ifdef MIPS32_SAVE_GP
uint32_t gp; /* Global pointer */
#endif
/* Floating point registers (not yet) */
};
#endif
#endif /* __ARCH_MIPS_SRC_MIPS32_VFORK_H */
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