nptl/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h

   1 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sysdep.h>
  21 #include <tls.h>
  22 #ifndef __ASSEMBLER__
  23 # include <nptl/pthreadP.h>
  24 #endif
  25
  26 #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
  27
  28 # undef PSEUDO
  29 # define PSEUDO(name, syscall_name, args)                                     \
  30   .text;                                                                      \
  31   ENTRY (name)                                                                \
  32     SINGLE_THREAD_P;                                                          \
  33     jne L(pseudo_cancel);                                                     \
  34     DO_CALL (syscall_name, args);                                             \
  35     cmpq $-4095, %rax;                                                        \
  36     jae SYSCALL_ERROR_LABEL;                                                  \
  37     ret;                                                                      \
  38   L(pseudo_cancel):                                                           \
  39     /* Save registers that might get destroyed.  */                           \
  40     SAVESTK_##args                                                            \
  41     PUSHARGS_##args                                                           \
  42     CENABLE                                                                   \
  43     /* Restore registers.  */                                                 \
  44     POPARGS_##args                                                            \
  45     /* The return value from CENABLE is argument for CDISABLE.  */            \
  46     movq %rax, (%rsp);                                                        \
  47     movq $SYS_ify (syscall_name), %rax;                                       \
  48     syscall;                                                                  \
  49     movq (%rsp), %rdi;                                                        \
  50     /* Save %rax since it's the error code from the syscall.  */              \
  51     movq %rax, 8(%rsp);                                                       \
  52     CDISABLE                                                                  \
  53     movq 8(%rsp), %rax;                                                       \
  54     RESTSTK_##args                                                            \
  55     cmpq $-4095, %rax;                                                        \
  56     jae SYSCALL_ERROR_LABEL;                                                  \
  57   L(pseudo_end):
  58
  59
  60 # define PUSHARGS_0     /* Nothing.  */
  61 # define PUSHARGS_1     PUSHARGS_0 movq %rdi, 8(%rsp);
  62 # define PUSHARGS_2     PUSHARGS_1 movq %rsi, 16(%rsp);
  63 # define PUSHARGS_3     PUSHARGS_2 movq %rdx, 24(%rsp);
  64 # define PUSHARGS_4     PUSHARGS_3 movq %rcx, 32(%rsp);
  65 # define PUSHARGS_5     PUSHARGS_4 movq %r8, 40(%rsp);
  66 # define PUSHARGS_6     PUSHARGS_5 movq %r9, 48(%rsp);
  67
  68 # define POPARGS_0      /* Nothing.  */
  69 # define POPARGS_1      POPARGS_0 movq 8(%rsp), %rdi;
  70 # define POPARGS_2      POPARGS_1 movq 16(%rsp), %rsi;
  71 # define POPARGS_3      POPARGS_2 movq 24(%rsp), %rdx;
  72 # define POPARGS_4      POPARGS_3 movq 32(%rsp), %r10;
  73 # define POPARGS_5      POPARGS_4 movq 40(%rsp), %r8;
  74 # define POPARGS_6      POPARGS_5 movq 48(%rsp), %r9;
  75
  76 /* We always have to align the stack before calling a function.  */
  77 # define SAVESTK_0      subq $24, %rsp; cfi_adjust_cfa_offset (24);
  78 # define SAVESTK_1      SAVESTK_0
  79 # define SAVESTK_2      SAVESTK_1
  80 # define SAVESTK_3      subq $40, %rsp; cfi_adjust_cfa_offset (40);
  81 # define SAVESTK_4      SAVESTK_3
  82 # define SAVESTK_5      subq $56, %rsp; cfi_adjust_cfa_offset (56);
  83 # define SAVESTK_6      SAVESTK_5
  84
  85 # define RESTSTK_0      addq $24,%rsp; cfi_adjust_cfa_offset (-24);
  86 # define RESTSTK_1      RESTSTK_0
  87 # define RESTSTK_2      RESTSTK_1
  88 # define RESTSTK_3      addq $40, %rsp; cfi_adjust_cfa_offset (-40);
  89 # define RESTSTK_4      RESTSTK_3
  90 # define RESTSTK_5      addq $56, %rsp; cfi_adjust_cfa_offset (-56);
  91 # define RESTSTK_6      RESTSTK_5
  92
  93 # ifdef IS_IN_libpthread
  94 #  define CENABLE       call __pthread_enable_asynccancel;
  95 #  define CDISABLE      call __pthread_disable_asynccancel;
  96 #  define __local_multiple_threads __pthread_multiple_threads
  97 # else
  98 #  define CENABLE       call __libc_enable_asynccancel;
  99 #  define CDISABLE      call __libc_disable_asynccancel;
 100 #  define __local_multiple_threads __libc_multiple_threads
 101 # endif
 102
 103 # ifndef __ASSEMBLER__
 104 extern int __local_multiple_threads attribute_hidden;
 105 #   define SINGLE_THREAD_P \
 106   __builtin_expect (__local_multiple_threads == 0, 1)
 107 # else
 108 #  define SINGLE_THREAD_P cmpl $0, __local_multiple_threads(%rip)
 109 # endif
 110
 111 #elif !defined __ASSEMBLER__
 112
 113 /* This code should never be used but we define it anyhow.  */
 114 # define SINGLE_THREAD_P (1)
 115
 116 #endif