l4/pkg/uclibc/lib/contrib/uclibc/libpthread/linuxthreads/sysdeps/unix/sysv/linux/alpha/sysdep-cancel.h

   1 /* Copyright (C) 2003 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #ifndef __ASSEMBLER__
  20 # include <linuxthreads/internals.h>
  21 #endif
  22
  23 #if !defined NOT_IN_libc || defined IS_IN_libpthread
  24
  25 # ifdef PROF
  26 #  define PSEUDO_PROF                           \
  27         .set noat;                              \
  28         lda     AT, _mcount;                    \
  29         jsr     AT, (AT), _mcount;              \
  30         .set at
  31 # else
  32 #  define PSEUDO_PROF
  33 # endif
  34
  35 /* ??? Assumes that nothing comes between PSEUDO and PSEUDO_END
  36    besides "ret".  */
  37
  38 # undef PSEUDO
  39 # define PSEUDO(name, syscall_name, args)                       \
  40         .globl name;                                            \
  41         .align 4;                                               \
  42         .type name, @function;                                  \
  43         .usepv name, std;                                       \
  44         cfi_startproc;                                          \
  45 __LABEL(name)                                                   \
  46         ldgp    gp, 0(pv);                                      \
  47         PSEUDO_PROF;                                            \
  48         PSEUDO_PREPARE_ARGS                                     \
  49         SINGLE_THREAD_P(t0);                                    \
  50         bne     t0, $pseudo_cancel;                             \
  51         lda     v0, SYS_ify(syscall_name);                      \
  52         call_pal PAL_callsys;                                   \
  53         bne     a3, SYSCALL_ERROR_LABEL;                        \
  54 __LABEL($pseudo_ret)                                            \
  55         .subsection 2;                                          \
  56 __LABEL($pseudo_cancel)                                         \
  57         subq    sp, 64, sp;                                     \
  58         cfi_def_cfa_offset(64);                                 \
  59         stq     ra, 0(sp);                                      \
  60         cfi_offset(ra, -64);                                    \
  61         SAVE_ARGS_##args;                                       \
  62         CENABLE;                                                \
  63         LOAD_ARGS_##args;                                       \
  64         lda     v0, SYS_ify(syscall_name);                      \
  65         call_pal PAL_callsys;                                   \
  66         stq     v0, 8(sp);                                      \
  67         bne     a3, $multi_error;                               \
  68         CDISABLE;                                               \
  69         ldq     ra, 0(sp);                                      \
  70         ldq     v0, 8(sp);                                      \
  71         addq    sp, 64, sp;                                     \
  72         cfi_remember_state;                                     \
  73         cfi_restore(ra);                                        \
  74         cfi_def_cfa_offset(0);                                  \
  75         ret;                                                    \
  76         cfi_restore_state;                                      \
  77 __LABEL($multi_error)                                           \
  78         CDISABLE;                                               \
  79         ldq     ra, 0(sp);                                      \
  80         ldq     v0, 8(sp);                                      \
  81         addq    sp, 64, sp;                                     \
  82         cfi_restore(ra);                                        \
  83         cfi_def_cfa_offset(0);                                  \
  84 __LABEL($syscall_error)                                         \
  85         SYSCALL_ERROR_HANDLER;                                  \
  86         .previous
  87
  88 # undef PSEUDO_END
  89 # define PSEUDO_END(sym)                                        \
  90         .subsection 2;                                          \
  91         cfi_endproc;                                            \
  92         .size sym, .-sym
  93
  94 # define SAVE_ARGS_0    /* Nothing.  */
  95 # define SAVE_ARGS_1    SAVE_ARGS_0; stq a0, 8(sp)
  96 # define SAVE_ARGS_2    SAVE_ARGS_1; stq a1, 16(sp)
  97 # define SAVE_ARGS_3    SAVE_ARGS_2; stq a2, 24(sp)
  98 # define SAVE_ARGS_4    SAVE_ARGS_3; stq a3, 32(sp)
  99 # define SAVE_ARGS_5    SAVE_ARGS_4; stq a4, 40(sp)
 100 # define SAVE_ARGS_6    SAVE_ARGS_5; stq a5, 48(sp)
 101
 102 # define LOAD_ARGS_0    /* Nothing.  */
 103 # define LOAD_ARGS_1    LOAD_ARGS_0; ldq a0, 8(sp)
 104 # define LOAD_ARGS_2    LOAD_ARGS_1; ldq a1, 16(sp)
 105 # define LOAD_ARGS_3    LOAD_ARGS_2; ldq a2, 24(sp)
 106 # define LOAD_ARGS_4    LOAD_ARGS_3; ldq a3, 32(sp)
 107 # define LOAD_ARGS_5    LOAD_ARGS_4; ldq a4, 40(sp)
 108 # define LOAD_ARGS_6    LOAD_ARGS_5; ldq a5, 48(sp)
 109
 110 # ifdef IS_IN_libpthread
 111 #  define __local_enable_asynccancel    __pthread_enable_asynccancel
 112 #  define __local_disable_asynccancel   __pthread_disable_asynccancel
 113 #  define __local_multiple_threads      __pthread_multiple_threads
 114 # else
 115 #  define __local_enable_asynccancel    __libc_enable_asynccancel
 116 #  define __local_disable_asynccancel   __libc_disable_asynccancel
 117 #  define __local_multiple_threads      __libc_multiple_threads
 118 # endif
 119
 120 # ifdef __PIC__
 121 #  define CENABLE       bsr ra, __local_enable_asynccancel !samegp
 122 #  define CDISABLE      bsr ra, __local_disable_asynccancel !samegp
 123 # else
 124 #  define CENABLE       jsr ra, __local_enable_asynccancel; ldgp ra, 0(gp)
 125 #  define CDISABLE      jsr ra, __local_disable_asynccancel; ldgp ra, 0(gp)
 126 # endif
 127
 128 # ifndef __ASSEMBLER__
 129 extern int __local_multiple_threads attribute_hidden;
 130 #   define SINGLE_THREAD_P \
 131   __builtin_expect (__local_multiple_threads == 0, 1)
 132 # elif defined(__PIC__)
 133 #  define SINGLE_THREAD_P(reg)  ldl reg, __local_multiple_threads(gp) !gprel
 134 # else
 135 #  define SINGLE_THREAD_P(reg)                                  \
 136         ldah    reg, __local_multiple_threads(gp) !gprelhigh;   \
 137         ldl     reg, __local_multiple_threads(reg) !gprellow
 138 # endif
 139
 140 #elif !defined __ASSEMBLER__
 141
 142 /* This code should never be used but we define it anyhow.  */
 143 # define SINGLE_THREAD_P (1)
 144
 145 #endif