nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h

   1 /* Cancellable system call stubs.  Linux/PowerPC64 version.
   2    Copyright (C) 2003-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Franz Sirl <Franz.Sirl-kernel@lauterbach.com>, 2003.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  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 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  29 #  define DASHDASHPFX(str) .__##str
  30 # else
  31 #  define DASHDASHPFX(str) __##str
  32 # endif
  33
  34 #if _CALL_ELF == 2
  35 #define CANCEL_FRAMESIZE (FRAME_MIN_SIZE+16+48)
  36 #define CANCEL_PARM_SAVE (FRAME_MIN_SIZE+16)
  37 #else
  38 #define CANCEL_FRAMESIZE (FRAME_MIN_SIZE+16)
  39 #define CANCEL_PARM_SAVE (CANCEL_FRAMESIZE+FRAME_PARM_SAVE)
  40 #endif
  41
  42 # undef PSEUDO
  43 # define PSEUDO(name, syscall_name, args)                               \
  44   .section ".text";                                                     \
  45   ENTRY (name)                                                          \
  46     SINGLE_THREAD_P;                                                    \
  47     bne- .Lpseudo_cancel;                                               \
  48   .type DASHDASHPFX(syscall_name##_nocancel),@function;                 \
  49   .globl DASHDASHPFX(syscall_name##_nocancel);                          \
  50   DASHDASHPFX(syscall_name##_nocancel):                                 \
  51     DO_CALL (SYS_ify (syscall_name));                                   \
  52     PSEUDO_RET;                                                         \
  53   .size DASHDASHPFX(syscall_name##_nocancel),.-DASHDASHPFX(syscall_name##_nocancel);    \
  54   .Lpseudo_cancel:                                                      \
  55     stdu 1,-CANCEL_FRAMESIZE(1);                                        \
  56     cfi_adjust_cfa_offset (CANCEL_FRAMESIZE);                           \
  57     mflr 9;                                                             \
  58     std  9,CANCEL_FRAMESIZE+FRAME_LR_SAVE(1);                           \
  59     cfi_offset (lr, FRAME_LR_SAVE);                                     \
  60     DOCARGS_##args;     /* save syscall args around CENABLE.  */        \
  61     CENABLE;                                                            \
  62     std  3,FRAME_MIN_SIZE(1); /* store CENABLE return value (MASK).  */ \
  63     UNDOCARGS_##args;   /* restore syscall args.  */                    \
  64     DO_CALL (SYS_ify (syscall_name));                                   \
  65     mfcr 0;             /* save CR/R3 around CDISABLE.  */              \
  66     std  3,FRAME_MIN_SIZE+8(1);                                         \
  67     std  0,CANCEL_FRAMESIZE+FRAME_CR_SAVE(1);                           \
  68     cfi_offset (cr, FRAME_CR_SAVE);                                     \
  69     ld   3,FRAME_MIN_SIZE(1); /* pass MASK to CDISABLE.  */             \
  70     CDISABLE;                                                           \
  71     ld   9,CANCEL_FRAMESIZE+FRAME_LR_SAVE(1);                           \
  72     ld   0,CANCEL_FRAMESIZE+FRAME_CR_SAVE(1); /* restore CR/R3. */      \
  73     ld   3,FRAME_MIN_SIZE+8(1);                                         \
  74     mtlr 9;                                                             \
  75     mtcr 0;                                                             \
  76     addi 1,1,CANCEL_FRAMESIZE;                                          \
  77     cfi_adjust_cfa_offset (-CANCEL_FRAMESIZE);                          \
  78     cfi_restore (lr);                                                   \
  79     cfi_restore (cr)
  80
  81 # define DOCARGS_0
  82 # define UNDOCARGS_0
  83
  84 # define DOCARGS_1      std 3,CANCEL_PARM_SAVE(1); DOCARGS_0
  85 # define UNDOCARGS_1    ld 3,CANCEL_PARM_SAVE(1); UNDOCARGS_0
  86
  87 # define DOCARGS_2      std 4,CANCEL_PARM_SAVE+8(1); DOCARGS_1
  88 # define UNDOCARGS_2    ld 4,CANCEL_PARM_SAVE+8(1); UNDOCARGS_1
  89
  90 # define DOCARGS_3      std 5,CANCEL_PARM_SAVE+16(1); DOCARGS_2
  91 # define UNDOCARGS_3    ld 5,CANCEL_PARM_SAVE+16(1); UNDOCARGS_2
  92
  93 # define DOCARGS_4      std 6,CANCEL_PARM_SAVE+24(1); DOCARGS_3
  94 # define UNDOCARGS_4    ld 6,CANCEL_PARM_SAVE+24(1); UNDOCARGS_3
  95
  96 # define DOCARGS_5      std 7,CANCEL_PARM_SAVE+32(1); DOCARGS_4
  97 # define UNDOCARGS_5    ld 7,CANCEL_PARM_SAVE+32(1); UNDOCARGS_4
  98
  99 # define DOCARGS_6      std 8,CANCEL_PARM_SAVE+40(1); DOCARGS_5
 100 # define UNDOCARGS_6    ld 8,CANCEL_PARM_SAVE+40(1); UNDOCARGS_5
 101
 102 # ifdef IS_IN_libpthread
 103 #  ifdef SHARED
 104 #   define CENABLE      bl JUMPTARGET(__pthread_enable_asynccancel)
 105 #   define CDISABLE     bl JUMPTARGET(__pthread_disable_asynccancel)
 106 #  else
 107 #   define CENABLE      bl JUMPTARGET(__pthread_enable_asynccancel); nop
 108 #   define CDISABLE     bl JUMPTARGET(__pthread_disable_asynccancel); nop
 109 #  endif
 110 # elif !defined NOT_IN_libc
 111 #  ifdef SHARED
 112 #   define CENABLE      bl JUMPTARGET(__libc_enable_asynccancel)
 113 #   define CDISABLE     bl JUMPTARGET(__libc_disable_asynccancel)
 114 #  else
 115 #   define CENABLE      bl JUMPTARGET(__libc_enable_asynccancel); nop
 116 #   define CDISABLE     bl JUMPTARGET(__libc_disable_asynccancel); nop
 117 #  endif
 118 # elif defined IS_IN_librt
 119 #  ifdef SHARED
 120 #   define CENABLE      bl JUMPTARGET(__librt_enable_asynccancel)
 121 #   define CDISABLE     bl JUMPTARGET(__librt_disable_asynccancel)
 122 #  else
 123 #   define CENABLE      bl JUMPTARGET(__librt_enable_asynccancel); nop
 124 #   define CDISABLE     bl JUMPTARGET(__librt_disable_asynccancel); nop
 125 #  endif
 126 # else
 127 #  error Unsupported library
 128 # endif
 129
 130 # ifndef __ASSEMBLER__
 131 #  define SINGLE_THREAD_P                                               \
 132   __builtin_expect (THREAD_GETMEM (THREAD_SELF,                         \
 133                                    header.multiple_threads) == 0, 1)
 134 # else
 135 #   define SINGLE_THREAD_P                                              \
 136   lwz   10,MULTIPLE_THREADS_OFFSET(13);                         \
 137   cmpwi 10,0
 138 # endif
 139
 140 #elif !defined __ASSEMBLER__
 141
 142 # define SINGLE_THREAD_P (1)
 143 # define NO_CANCELLATION 1
 144
 145 #endif
 146
 147 #ifndef __ASSEMBLER__
 148 # define RTLD_SINGLE_THREAD_P \
 149   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
 150                                    header.multiple_threads) == 0, 1)
 151 #endif