133 lines
5.3 KiB
C
133 lines
5.3 KiB
C
/****************************************************************************
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* arch/mips/src/mips/up_vfork.h
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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#ifndef __ARCH_MIPS_SRC_MIPS32_VFORK_H
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#define __ARCH_MIPS_SRC_MIPS32_VFORK_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <arch/mips32/irq.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Register r30 may be a frame pointer in some ABIs. Or may just be saved
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* register s8. It makes a difference for vfork handling.
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*/
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#undef VFORK_HAVE_FP
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/* r0 zero Always has the value 0.
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* r1 at Temporary generally used by assembler.
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* r2-r3 v0-v1 Used for expression evaluations and to hold the integer and
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* pointer type function return values.
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* r4-r7 a0-a3 Used for passing arguments to functions; values are not
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* preserved across function calls.
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* r8-r15 t0-t7 Temporary registers used for expression evaluation; values
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* are not preserved across function calls.
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* r16-r23 s0-s7 Saved registers; values are preserved across function calls.
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* r24-r25 t8-t9 Temporary registers used for expression evaluations; values
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* are not preserved across function calls. When calling
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* position independent functions r25 must contain the address
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* of the called function.
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* r26-r27 k0-k1 Used only by the operating system.
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* r28 gp Global pointer and context pointer.
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* r29 sp Stack pointer.
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* r30 s8 Saved register (like s0-s7). If a frame pointer is used,
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* then this is the frame pointer.
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* r31 ra Return address.
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*/
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#define VFORK_S0_OFFSET (0*4) /* Saved register s0 */
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#define VFORK_S1_OFFSET (1*4) /* Saved register s1 */
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#define VFORK_S2_OFFSET (2*4) /* Saved register s2 */
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#define VFORK_S3_OFFSET (3*4) /* Saved register s3 */
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#define VFORK_S4_OFFSET (4*4) /* Saved register s4 */
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#define VFORK_S5_OFFSET (5*4) /* Saved register s5 */
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#define VFORK_S6_OFFSET (6*4) /* Saved register s6 */
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#define VFORK_S7_OFFSET (7*4) /* Saved register s7 */
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#ifdef CONFIG_MIPS32_FRAMEPOINTER
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# define VFORK_FP_OFFSET (8*4) /* Frame pointer */
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#else
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# define VFORK_S8_OFFSET (8*4) /* Saved register s8 */
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#endif
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#define VFORK_SP_OFFSET (9*4) /* Stack pointer*/
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#define VFORK_RA_OFFSET (10*4) /* Return address*/
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#ifdef MIPS32_SAVE_GP
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# define VFORK_GP_OFFSET (11*4) /* Global pointer */
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# define VFORK_SIZEOF (12*4)
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#else
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# define VFORK_SIZEOF (11*4)
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifndef __ASSEMBLY__
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struct vfork_s
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{
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/* CPU registers */
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uint32_t s0; /* Saved register s0 */
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uint32_t s1; /* Saved register s1 */
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uint32_t s2; /* Saved register s2 */
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uint32_t s3; /* Saved register s3 */
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uint32_t s4; /* Saved register s4 */
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uint32_t s5; /* Saved register s5 */
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uint32_t s6; /* Saved register s6 */
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uint32_t s7; /* Saved register s7 */
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#ifdef CONFIG_MIPS32_FRAMEPOINTER
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uint32_t fp; /* Frame pointer */
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#else
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uint32_t s8; /* Saved register s8 */
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#endif
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uint32_t sp; /* Stack pointer*/
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uint32_t ra; /* Return address*/
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#ifdef MIPS32_SAVE_GP
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uint32_t gp; /* Global pointer */
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#endif
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/* Floating point registers (not yet) */
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};
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#endif
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#endif /* __ARCH_MIPS_SRC_MIPS32_VFORK_H */
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