ports/sysdeps/unix/sysv/linux/mips/mips64/nptl/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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #include <sysdeps/generic/sysdep.h>
  20 #include <tls.h>
  21 #ifndef __ASSEMBLER__
  22 # include <nptl/pthreadP.h>
  23 #endif
  24 #include <sys/asm.h>
  25
  26 /* Gas will put the initial save of $gp into the CIE, because it appears to
  27    happen before any instructions.  So we use cfi_same_value instead of
  28    cfi_restore.  */
  29
  30 #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
  31
  32 #ifdef __PIC__
  33 # undef PSEUDO
  34 # define PSEUDO(name, syscall_name, args)                                     \
  35       .align 2;                                                               \
  36   L(pseudo_start):                                                            \
  37       cfi_startproc;                                                          \
  38       cfi_adjust_cfa_offset (STKSPACE);                                       \
  39       cfi_rel_offset (gp, STKOFF_GP);                                         \
  40   99: PTR_LA t9,__syscall_error;                                              \
  41       /* manual cpreturn */                                                   \
  42       REG_L gp, STKOFF_GP(sp);                                                \
  43       cfi_same_value (gp);                                                    \
  44       RESTORESTK;                                                             \
  45       jr t9;                                                                  \
  46   .type __##syscall_name##_nocancel, @function;                               \
  47   .globl __##syscall_name##_nocancel;                                         \
  48   __##syscall_name##_nocancel:                                                \
  49     SAVESTK;                                                                  \
  50     .cpsetup t9, STKOFF_GP, name;                                             \
  51     cfi_rel_offset (gp, STKOFF_GP);                                           \
  52     li v0, SYS_ify(syscall_name);                                             \
  53     syscall;                                                                  \
  54     bne a3, zero, SYSCALL_ERROR_LABEL;                                        \
  55     /* manual cpreturn */                                                     \
  56     REG_L gp, STKOFF_GP(sp);                                                  \
  57     cfi_same_value (gp);                                                      \
  58     RESTORESTK;                                                               \
  59     ret;                                                                      \
  60   .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;            \
  61   ENTRY (name)                                                                \
  62     SAVESTK;                                                                  \
  63     .cpsetup t9, STKOFF_GP, name;                                             \
  64     cfi_rel_offset (gp, STKOFF_GP);                                           \
  65     SINGLE_THREAD_P(v1);                                                      \
  66     bne zero, v1, L(pseudo_cancel);                                           \
  67     .set noreorder;                                                           \
  68     li v0, SYS_ify(syscall_name);                                             \
  69     syscall;                                                                  \
  70     .set reorder;                                                             \
  71     bne a3, zero, SYSCALL_ERROR_LABEL;                                        \
  72     /* manual cpreturn */                                                     \
  73     REG_L gp, STKOFF_GP(sp);                                                  \
  74     cfi_same_value (gp);                                                      \
  75     RESTORESTK;                                                               \
  76     ret;                                                                      \
  77   L(pseudo_cancel):                                                           \
  78     cfi_adjust_cfa_offset (STKSPACE);                                         \
  79     cfi_rel_offset (gp, STKOFF_GP);                                           \
  80     REG_S ra, STKOFF_RA(sp);                                                  \
  81     cfi_rel_offset (ra, STKOFF_RA);                                           \
  82     PUSHARGS_##args;                    /* save syscall args */               \
  83     CENABLE;                                                                  \
  84     REG_S v0, STKOFF_SVMSK(sp);         /* save mask */                       \
  85     POPARGS_##args;                     /* restore syscall args */            \
  86     .set noreorder;                                                           \
  87     li v0, SYS_ify (syscall_name);                                            \
  88     syscall;                                                                  \
  89     .set reorder;                                                             \
  90     REG_S v0, STKOFF_SC_V0(sp);         /* save syscall result */             \
  91     REG_S a3, STKOFF_SC_ERR(sp);        /* save syscall error flag */         \
  92     REG_L a0, STKOFF_SVMSK(sp);         /* pass mask as arg1 */               \
  93     CDISABLE;                                                                 \
  94     REG_L a3, STKOFF_SC_ERR(sp);        /* restore syscall error flag */      \
  95     REG_L ra, STKOFF_RA(sp);            /* restore return address */          \
  96     REG_L v0, STKOFF_SC_V0(sp);         /* restore syscall result */          \
  97     bne a3, zero, SYSCALL_ERROR_LABEL;                                        \
  98     /* manual cpreturn */                                                     \
  99     REG_L gp, STKOFF_GP(sp);                                                  \
 100     cfi_same_value (gp);                                                      \
 101     RESTORESTK;                                                               \
 102   L(pseudo_end):
 103
 104
 105 # undef PSEUDO_END
 106 # define PSEUDO_END(sym) cfi_endproc; .end sym; .size sym,.-sym
 107
 108 #endif
 109
 110 # define PUSHARGS_0     /* nothing to do */
 111 # define PUSHARGS_1     PUSHARGS_0 REG_S a0, STKOFF_A0(sp); cfi_rel_offset (a0, STKOFF_A0);
 112 # define PUSHARGS_2     PUSHARGS_1 REG_S a1, STKOFF_A1(sp); cfi_rel_offset (a1, STKOFF_A1);
 113 # define PUSHARGS_3     PUSHARGS_2 REG_S a2, STKOFF_A2(sp); cfi_rel_offset (a2, STKOFF_A2);
 114 # define PUSHARGS_4     PUSHARGS_3 REG_S a3, STKOFF_A3(sp); cfi_rel_offset (a3, STKOFF_A3);
 115 # define PUSHARGS_5     PUSHARGS_4 REG_S a4, STKOFF_A4(sp); cfi_rel_offset (a3, STKOFF_A4);
 116 # define PUSHARGS_6     PUSHARGS_5 REG_S a5, STKOFF_A5(sp); cfi_rel_offset (a3, STKOFF_A5);
 117
 118 # define POPARGS_0      /* nothing to do */
 119 # define POPARGS_1      POPARGS_0 REG_L a0, STKOFF_A0(sp);
 120 # define POPARGS_2      POPARGS_1 REG_L a1, STKOFF_A1(sp);
 121 # define POPARGS_3      POPARGS_2 REG_L a2, STKOFF_A2(sp);
 122 # define POPARGS_4      POPARGS_3 REG_L a3, STKOFF_A3(sp);
 123 # define POPARGS_5      POPARGS_4 REG_L a4, STKOFF_A4(sp);
 124 # define POPARGS_6      POPARGS_5 REG_L a5, STKOFF_A5(sp);
 125
 126 /* Save an even number of slots.  Should be 0 if an even number of slots
 127    are used below, or SZREG if an odd number are used.  */
 128 # define STK_PAD        SZREG
 129
 130 /* Place values that we are more likely to use later in this sequence, i.e.
 131    closer to the SP at function entry.  If you do that, the are more
 132    likely to already be in your d-cache.  */
 133 # define STKOFF_A5      (STK_PAD)
 134 # define STKOFF_A4      (STKOFF_A5 + SZREG)
 135 # define STKOFF_A3      (STKOFF_A4 + SZREG)
 136 # define STKOFF_A2      (STKOFF_A3 + SZREG)     /* MT and more args.  */
 137 # define STKOFF_A1      (STKOFF_A2 + SZREG)     /* MT and 2 args.  */
 138 # define STKOFF_A0      (STKOFF_A1 + SZREG)     /* MT and 1 arg.  */
 139 # define STKOFF_RA      (STKOFF_A0 + SZREG)     /* Used if MT.  */
 140 # define STKOFF_SC_V0   (STKOFF_RA + SZREG)     /* Used if MT.  */
 141 # define STKOFF_SC_ERR  (STKOFF_SC_V0 + SZREG)  /* Used if MT.  */
 142 # define STKOFF_SVMSK   (STKOFF_SC_ERR + SZREG) /* Used if MT.  */
 143 # define STKOFF_GP      (STKOFF_SVMSK + SZREG)  /* Always used.  */
 144
 145 # define STKSPACE       (STKOFF_GP + SZREG)
 146 # define SAVESTK        PTR_SUBU sp, STKSPACE; cfi_adjust_cfa_offset(STKSPACE)
 147 # define RESTORESTK     PTR_ADDU sp, STKSPACE; cfi_adjust_cfa_offset(-STKSPACE)
 148
 149 # ifdef IS_IN_libpthread
 150 #  define CENABLE       PTR_LA t9, __pthread_enable_asynccancel; jalr t9
 151 #  define CDISABLE      PTR_LA t9, __pthread_disable_asynccancel; jalr t9
 152 # elif defined IS_IN_librt
 153 #  define CENABLE       PTR_LA t9, __librt_enable_asynccancel; jalr t9
 154 #  define CDISABLE      PTR_LA t9, __librt_disable_asynccancel; jalr t9
 155 # else
 156 #  define CENABLE       PTR_LA t9, __libc_enable_asynccancel; jalr t9
 157 #  define CDISABLE      PTR_LA t9, __libc_disable_asynccancel; jalr t9
 158 # endif
 159
 160 # ifndef __ASSEMBLER__
 161 #  define SINGLE_THREAD_P                                               \
 162         __builtin_expect (THREAD_GETMEM (THREAD_SELF,                   \
 163                                          header.multiple_threads)       \
 164                           == 0, 1)
 165 # else
 166 #  define SINGLE_THREAD_P(reg)                                          \
 167         READ_THREAD_POINTER(reg);                                       \
 168         lw reg, MULTIPLE_THREADS_OFFSET(reg)
 169 #endif
 170
 171 #elif !defined __ASSEMBLER__
 172
 173 # define SINGLE_THREAD_P 1
 174 # define NO_CANCELLATION 1
 175
 176 #endif
 177
 178 #ifndef __ASSEMBLER__
 179 # define RTLD_SINGLE_THREAD_P \
 180   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
 181                                    header.multiple_threads) == 0, 1)
 182 #endif