nptl/sysdeps/unix/sysv/linux/sh/sysdep-cancel.h

   1 /* Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <sysdep.h>
  20 #include <tls.h>
  21 #ifndef __ASSEMBLER__
  22 # include <nptl/pthreadP.h>
  23 #endif
  24
  25 #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
  26
  27 # define _IMM12 #-12
  28 # define _IMM16 #-16
  29 # define _IMP16 #16
  30 # undef PSEUDO
  31 # define PSEUDO(name, syscall_name, args) \
  32   .text; \
  33   ENTRY (name); \
  34   .Lpseudo_start: \
  35     SINGLE_THREAD_P; \
  36     bf .Lpseudo_cancel; \
  37     .type __##syscall_name##_nocancel,@function; \
  38     .globl __##syscall_name##_nocancel; \
  39     __##syscall_name##_nocancel: \
  40     DO_CALL (syscall_name, args); \
  41     mov r0,r1; \
  42     mov _IMM12,r2; \
  43     shad r2,r1; \
  44     not r1,r1; \
  45     tst r1,r1; \
  46     bt .Lsyscall_error; \
  47     bra .Lpseudo_end; \
  48      nop; \
  49     .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
  50  .Lpseudo_cancel: \
  51     sts.l pr,@-r15; \
  52     cfi_adjust_cfa_offset (4); \
  53     cfi_rel_offset (pr, 0); \
  54     add _IMM16,r15; \
  55     cfi_adjust_cfa_offset (16); \
  56     SAVE_ARGS_##args; \
  57     CENABLE; \
  58     LOAD_ARGS_##args; \
  59     add _IMP16,r15; \
  60     cfi_adjust_cfa_offset (-16); \
  61     lds.l @r15+,pr; \
  62     cfi_adjust_cfa_offset (-4); \
  63     cfi_restore (pr); \
  64     DO_CALL(syscall_name, args); \
  65     SYSCALL_INST_PAD; \
  66     sts.l pr,@-r15; \
  67     cfi_adjust_cfa_offset (4); \
  68     cfi_rel_offset (pr, 0); \
  69     mov.l r0,@-r15; \
  70     cfi_adjust_cfa_offset (4); \
  71     cfi_rel_offset (r0, 0); \
  72     CDISABLE; \
  73     mov.l @r15+,r0; \
  74     cfi_adjust_cfa_offset (-4); \
  75     lds.l @r15+,pr; \
  76     cfi_adjust_cfa_offset (-4); \
  77     cfi_restore (pr); \
  78     mov r0,r1; \
  79     mov _IMM12,r2; \
  80     shad r2,r1; \
  81     not r1,r1; \
  82     tst r1,r1; \
  83     bf .Lpseudo_end; \
  84  .Lsyscall_error: \
  85     SYSCALL_ERROR_HANDLER; \
  86  .Lpseudo_end:
  87
  88 # undef PSEUDO_END
  89 # define PSEUDO_END(sym) \
  90   END (sym)
  91
  92 # define SAVE_ARGS_0    /* Nothing.  */
  93 # define SAVE_ARGS_1    SAVE_ARGS_0; mov.l r4,@(0,r15); cfi_offset (r4,-4)
  94 # define SAVE_ARGS_2    SAVE_ARGS_1; mov.l r5,@(4,r15); cfi_offset (r5,-8)
  95 # define SAVE_ARGS_3    SAVE_ARGS_2; mov.l r6,@(8,r15); cfi_offset (r6,-12)
  96 # define SAVE_ARGS_4    SAVE_ARGS_3; mov.l r7,@(12,r15); cfi_offset (r7,-16)
  97 # define SAVE_ARGS_5    SAVE_ARGS_4
  98 # define SAVE_ARGS_6    SAVE_ARGS_5
  99
 100 # define LOAD_ARGS_0    /* Nothing.  */
 101 # define LOAD_ARGS_1    LOAD_ARGS_0; mov.l @(0,r15),r4
 102 # define LOAD_ARGS_2    LOAD_ARGS_1; mov.l @(4,r15),r5
 103 # define LOAD_ARGS_3    LOAD_ARGS_2; mov.l @(8,r15),r6
 104 # define LOAD_ARGS_4    LOAD_ARGS_3; mov.l @(12,r15),r7
 105 # define LOAD_ARGS_5    LOAD_ARGS_4
 106 # define LOAD_ARGS_6    LOAD_ARGS_5
 107
 108 # ifdef IS_IN_libpthread
 109 #  define __local_enable_asynccancel    __pthread_enable_asynccancel
 110 #  define __local_disable_asynccancel   __pthread_disable_asynccancel
 111 # elif !defined NOT_IN_libc
 112 #  define __local_enable_asynccancel    __libc_enable_asynccancel
 113 #  define __local_disable_asynccancel   __libc_disable_asynccancel
 114 # elif defined IS_IN_librt
 115 #  define __local_enable_asynccancel    __librt_enable_asynccancel
 116 #  define __local_disable_asynccancel   __librt_disable_asynccancel
 117 # else
 118 #  error Unsupported library
 119 # endif
 120
 121 # define CENABLE \
 122         mov.l 1f,r0; \
 123         bsrf r0; \
 124          nop; \
 125      0: bra 2f; \
 126          mov r0,r2; \
 127         .align 2; \
 128      1: .long __local_enable_asynccancel - 0b; \
 129      2:
 130
 131 # define CDISABLE \
 132         mov.l 1f,r0; \
 133         bsrf r0; \
 134          mov r2,r4; \
 135      0: bra 2f; \
 136          nop; \
 137         .align 2; \
 138      1: .long __local_disable_asynccancel - 0b; \
 139      2:
 140
 141 # ifndef __ASSEMBLER__
 142 #  define SINGLE_THREAD_P \
 143   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
 144                                    header.multiple_threads) == 0, 1)
 145 # else
 146 #  define SINGLE_THREAD_P \
 147         stc gbr,r0; \
 148         mov.w 0f,r1; \
 149         sub r1,r0; \
 150         mov.l @(MULTIPLE_THREADS_OFFSET,r0),r0; \
 151         bra 1f; \
 152          tst r0,r0; \
 153      0: .word TLS_PRE_TCB_SIZE; \
 154      1:
 155
 156 # endif
 157
 158 #elif !defined __ASSEMBLER__
 159
 160 # define SINGLE_THREAD_P (1)
 161 # define NO_CANCELLATION 1
 162
 163 #endif
 164
 165 #ifndef __ASSEMBLER__
 166 # define RTLD_SINGLE_THREAD_P \
 167   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
 168                                    header.multiple_threads) == 0, 1)
 169 #endif