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244 lines
8.0 KiB
244 lines
8.0 KiB
/**************************************************************************** |
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* arch/mips/include/mips32/syscall.h |
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* |
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* Copyright (C) 2011 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr> |
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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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/* This file should never be included directed but, rather, only indirectly |
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* through include/syscall.h or include/sys/sycall.h |
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*/ |
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#ifndef __ARCH_MIPS_INCLUDE_MIPS32_SYSCALL_H |
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#define __ARCH_MIPS_INCLUDE_MIPS32_SYSCALL_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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#ifndef __ASSEMBLY__ |
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# include <stdint.h> |
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#endif |
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/**************************************************************************** |
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* Pro-processor Definitions |
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****************************************************************************/ |
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#define SYS_syscall 0x00 |
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/* Configuration ********************************************************************/ |
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/* This logic uses three system calls {0,1,2} for context switching. The first three |
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* syscall values must be reserved. |
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*/ |
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#ifdef CONFIG_NUTTX_KERNEL |
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# ifndef CONFIG_SYS_RESERVED |
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# error "CONFIG_SYS_RESERVED must be defined to the value 2" |
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# elif CONFIG_SYS_RESERVED != 2 |
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# error "CONFIG_SYS_RESERVED must have the value 2" |
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# endif |
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#endif |
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/* sys_call macros ******************************************************************/ |
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/* System calls with 3 parameters and fewer are handled by sys_call0 (sys_call1, |
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* sys_call2, and sys_call3 are aliases for sys_call0). This is because the |
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* parmeters are passed in a0-a3. a0 is reserved for the syscall number leaving |
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* up to thre additional parameters that can be passed in registers. The remainder |
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* would have to be pushed onto the stack. |
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* |
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* Instead, these macros are provided which handle parameters four, five and six in |
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* a non-standard way: The use s0 ($7), s1 ($8), and s2 ($9) to pass the additional |
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* parameters. |
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*/ |
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#ifndef __ASSEMBLY__ |
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/* System call SYS_ argument and four additional parameters. */ |
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#define sys_call4(nbr,parm1,parm2,parm3,parm4) __extension__({ \ |
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uintptr_t __result; \ |
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__asm__ __volatile__ (\ |
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"\tmove $4, %0\n" \ |
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"\tmove $5, %1\n" \ |
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"\tmove $6, %2\n" \ |
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"\tmove $7, %3\n" \ |
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"\tmove $8, %4\n" \ |
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"\la $12, sys_call3\n" \ |
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"\jalr $12, $31\n" \ |
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"\tmove %5, $r2\n" \ |
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: "=r" (nbr) "=r" (parm1) "=r" (parm2) "=r" (parm3) "=r" (parm4) \ |
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: " "r"(__result)\ |
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: "memory"\ |
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); \ |
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__result; \ |
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}) |
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/* System call SYS_ argument and five additional parameters. */ |
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#define sys_call5(nbr,parm1,parm2,parm3,parm4,parm5) __extension__({ \ |
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uintptr_t __result; \ |
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__asm__ __volatile__ (\ |
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"\tmove $4, %0\n" \ |
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"\tmove $5, %1\n" \ |
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"\tmove $6, %2\n" \ |
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"\tmove $7, %3\n" \ |
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"\tmove $8, %4\n" \ |
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"\tmove $9, %5\n" \ |
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"\la $12, sys_call3\n" \ |
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"\jalr $12, $31\n" \ |
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"\tmove %6, $r2\n" \ |
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: "=r" (nbr) "=r" (parm1) "=r" (parm2) "=r" (parm3) "=r" (parm4) "=r" (parm5) \ |
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: " "r"(__result)\ |
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: "memory"\ |
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); \ |
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__result; \ |
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}) |
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/* System call SYS_ argument and six additional parameters. */ |
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#define sys_call5(nbr,parm1,parm2,parm3,parm4,parm5,parm6) __extension__({ \ |
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uintptr_t __result; \ |
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__asm__ __volatile__ (\ |
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"\tmove $4, %0\n" \ |
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"\tmove $5, %1\n" \ |
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"\tmove $6, %2\n" \ |
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"\tmove $7, %3\n" \ |
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"\tmove $8, %4\n" \ |
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"\tmove $9, %5\n" \ |
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"\tmove $10, %5\n" \ |
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"\la $12, sys_call3\n" \ |
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"\jalr $12, $31\n" \ |
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"\tmove %6, $r2\n" \ |
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: "=r" (nbr) "=r" (parm1) "=r" (parm2) "=r" (parm3) "=r" (parm4) "=r" (parm5) \ |
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: " "r"(__result)\ |
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: "memory"\ |
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); \ |
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__result; \ |
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}) |
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/* Context switching system calls ***************************************************/ |
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/* SYS call 1: |
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* |
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* void up_fullcontextrestore(uint32_t *restoreregs) __attribute__ ((noreturn)); |
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*/ |
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#define SYS_restore_context (1) |
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#define up_fullcontextrestore(restoreregs) \ |
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(void)sys_call1(SYS_restore_context, (uintptr_t)restoreregs) |
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/* SYS call 2: |
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* |
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* void up_switchcontext(uint32_t *saveregs, uint32_t *restoreregs); |
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*/ |
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#define SYS_switch_context (2) |
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#define up_switchcontext(saveregs, restoreregs) \ |
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(void)sys_call2(SYS_switch_context, (uintptr_t)saveregs, (uintptr_t)restoreregs) |
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#endif /* __ASSEMBLY__ */ |
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/**************************************************************************** |
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* Public Types |
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****************************************************************************/ |
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/**************************************************************************** |
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* Inline functions |
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****************************************************************************/ |
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#ifndef __ASSEMBLY__ |
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/**************************************************************************** |
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* Public Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Public Function Prototypes |
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****************************************************************************/ |
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#ifdef __cplusplus |
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#define EXTERN extern "C" |
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extern "C" { |
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#else |
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#define EXTERN extern |
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#endif |
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/**************************************************************************** |
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* Name: up_syscall0 |
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* |
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* Description: |
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* System call SYS_ argument and no additional parameters. |
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* |
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****************************************************************************/ |
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EXTERN uintptr_t sys_call0(unsigned int nbr); |
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/**************************************************************************** |
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* Name: up_syscall1 |
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* |
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* Description: |
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* System call SYS_ argument and one additional parameter. |
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* |
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****************************************************************************/ |
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EXTERN uintptr_t sys_call1(unsigned int nbr, uintptr_t parm1); |
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/**************************************************************************** |
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* Name: up_syscall2 |
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* |
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* Description: |
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* System call SYS_ argument and two additional parameters. |
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* |
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****************************************************************************/ |
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EXTERN uintptr_t sys_call2(unsigned int nbr, uintptr_t parm1, uintptr_t parm2); |
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/**************************************************************************** |
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* Name: up_syscall3 |
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* |
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* Description: |
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* System call SYS_ argument and three additional parameters. |
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* |
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****************************************************************************/ |
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EXTERN uintptr_t sys_call3(unsigned int nbr, uintptr_t parm1, |
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uintptr_t parm2, uintptr_t parm3); |
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#undef EXTERN |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __ARCH_MIPS_INCLUDE_MIPS32_SYSCALL_H */ |
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