lib/libc/arch/arm/SYS.h

   1 /*      $NetBSD: SYS.h,v 1.15 2013/08/19 22:13:34 matt Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1990 The Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * William Jolitz.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      from: @(#)SYS.h 5.5 (Berkeley) 5/7/91
  35  */
  36
  37 #define _TEXT_SECTION   .section .text.hot, "ax"
  38
  39 #include <machine/asm.h>
  40 #include <sys/syscall.h>
  41 #include <arm/swi.h>
  42
  43 #ifndef __STDC__
  44 #error __STDC__ not defined
  45 #endif
  46
  47 #if !defined(__thumb__)
  48 #define SYSTRAP(x)      svc #SWI_OS_NETBSD | SYS_ ## x
  49 #else
  50 .macro  emitsvc x
  51         mov     ip, r0
  52 .ifeq   \x / 256
  53         movs    r0, #\x
  54 .else
  55 #if defined(_ARM_ARCH_7)
  56         movw    r0, #\x
  57 #else
  58 .ifeq (\x & 3)
  59         movs    r0, #(\x / 4)
  60         lsls    r0, r0, #3
  61 .else
  62 .ifeq (\x & 1)
  63         movs    r0, #(\x / 2)
  64         lsls    r0, r0, #1
  65 .else
  66         movs    r0, #(\x / 256)
  67         lsls    r0, r0, #8
  68         adds    r0, r0, #(\x & 255)
  69 .endif
  70 .endif
  71 #endif /* !_ARM_ARCH_7 */
  72 .endif
  73         svc     #255
  74 .endm
  75 #define SYSTRAP(x)      emitsvc SYS_ ## x
  76 #endif /* __thumb__ */
  77
  78 #define CERROR          _C_LABEL(__cerror)
  79 #define CURBRK          _C_LABEL(__curbrk)
  80
  81 #define _SYSCALL_NOERROR(x,y)                                           \
  82         ENTRY(x);                                                       \
  83         SYSTRAP(y)
  84
  85 #if  !defined(__thumb__) || defined(_ARM_ARCH_T2)
  86 #define _INVOKE_CERROR()        bcs CERROR
  87 #else
  88 #define _INVOKE_CERROR()        \
  89         bcc 86f; push {r3,lr}; bl CERROR; pop {r3,pc}; 86:
  90 #endif
  91 #define _SYSCALL(x, y)                                                  \
  92         _SYSCALL_NOERROR(x,y);                                          \
  93         _INVOKE_CERROR()
  94
  95 #define SYSCALL_NOERROR(x)                                              \
  96         _SYSCALL_NOERROR(x,x)
  97
  98 #define SYSCALL(x)                                                      \
  99         _SYSCALL(x,x)
 100
 101
 102 #define PSEUDO_NOERROR(x,y)                                             \
 103         _SYSCALL_NOERROR(x,y);                                          \
 104         RET;                                                            \
 105         END(x)
 106
 107 #define PSEUDO(x,y)                                                     \
 108         _SYSCALL(x,y);                                                  \
 109         RET;                                                            \
 110         END(x)
 111
 112
 113 #define RSYSCALL_NOERROR(x)                                             \
 114         PSEUDO_NOERROR(x,x)
 115
 116 #define RSYSCALL(x)                                                     \
 117         PSEUDO(x,x)
 118
 119 #ifdef WEAK_ALIAS
 120 #define WSYSCALL(weak,strong)                                           \
 121         WEAK_ALIAS(weak,strong);                                        \
 122         PSEUDO(strong,weak)
 123 #else
 124 #define WSYSCALL(weak,strong)                                           \
 125         PSEUDO(weak,weak)
 126 #endif
 127
 128         .hidden CERROR
 129         .globl  CERROR