gcc/config/alpha/linux.h

   1 /* Definitions of target machine for GNU compiler,
   2    for Alpha Linux-based GNU systems.
   3    Copyright (C) 1996, 1997, 1998, 2002, 2003, 2004
   4    Free Software Foundation, Inc.
   5    Contributed by Richard Henderson.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, USA.  */
  23
  24 #undef TARGET_DEFAULT
  25 #define TARGET_DEFAULT (MASK_FP | MASK_FPREGS | MASK_GAS)
  26
  27 #define TARGET_OS_CPP_BUILTINS()                                \
  28     do {                                                        \
  29         builtin_define ("__gnu_linux__");                       \
  30         builtin_define ("_LONGLONG");                           \
  31         builtin_define_std ("linux");                           \
  32         builtin_define_std ("unix");                            \
  33         builtin_assert ("system=linux");                        \
  34         builtin_assert ("system=unix");                         \
  35         builtin_assert ("system=posix");                        \
  36         /* The GNU C++ standard library requires this.  */      \
  37         if (c_dialect_cxx ())                                   \
  38           builtin_define ("_GNU_SOURCE");                       \
  39     } while (0)
  40
  41 #undef LIB_SPEC
  42 #define LIB_SPEC \
  43   "%{pthread:-lpthread} \
  44    %{shared:-lc} \
  45    %{!shared: %{profile:-lc_p}%{!profile:-lc}}"
  46
  47 /* Show that we need a GP when profiling.  */
  48 #undef TARGET_PROFILING_NEEDS_GP
  49 #define TARGET_PROFILING_NEEDS_GP 1
  50
  51 /* Don't care about faults in the prologue.  */
  52 #undef TARGET_CAN_FAULT_IN_PROLOGUE
  53 #define TARGET_CAN_FAULT_IN_PROLOGUE 1
  54
  55 /* OS fixes up EV5 data fault on prefetch.  */
  56 #undef TARGET_FIXUP_EV5_PREFETCH
  57 #define TARGET_FIXUP_EV5_PREFETCH 1
  58
  59 #undef WCHAR_TYPE
  60 #define WCHAR_TYPE "int"
  61
  62 /* Define this so that all GNU/Linux targets handle the same pragmas.  */
  63 #define HANDLE_PRAGMA_PACK_PUSH_POP
  64
  65 /* Determine whether the the entire c99 runtime is present in the
  66    runtime library.  */
  67 #define TARGET_C99_FUNCTIONS 1
  68
  69 #define TARGET_HAS_F_SETLKW
  70
  71 #define LINK_GCC_C_SEQUENCE_SPEC \
  72   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
  73
  74 /* Use --as-needed -lgcc_s for eh support.  */
  75 #ifdef HAVE_LD_AS_NEEDED
  76 #define USE_LD_AS_NEEDED 1
  77 #endif
  78
  79 /* Do code reading to identify a signal frame, and set the frame
  80    state data appropriately.  See unwind-dw2.c for the structs.  */
  81
  82 #ifdef IN_LIBGCC2
  83 #include <signal.h>
  84 #include <sys/ucontext.h>
  85 #endif
  86
  87 #define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS)               \
  88   do {                                                                  \
  89     unsigned int *pc_ = (CONTEXT)->ra;                                  \
  90     struct sigcontext *sc_;                                             \
  91     long new_cfa_, i_;                                                  \
  92                                                                         \
  93     if (pc_[0] != 0x47fe0410            /* mov $30,$16 */               \
  94         || pc_[2] != 0x00000083         /* callsys */)                  \
  95       break;                                                            \
  96     if ((CONTEXT)->cfa == 0)                                            \
  97       break;                                                            \
  98     if (pc_[1] == 0x201f0067)           /* lda $0,NR_sigreturn */       \
  99       sc_ = (CONTEXT)->cfa;                                             \
 100     else if (pc_[1] == 0x201f015f)      /* lda $0,NR_rt_sigreturn */    \
 101       {                                                                 \
 102         struct rt_sigframe {                                            \
 103           struct siginfo info;                                          \
 104           struct ucontext uc;                                           \
 105         } *rt_ = (CONTEXT)->cfa;                                        \
 106         sc_ = &rt_->uc.uc_mcontext;                                     \
 107       }                                                                 \
 108     else                                                                \
 109       break;                                                            \
 110     new_cfa_ = sc_->sc_regs[30];                                        \
 111     (FS)->cfa_how = CFA_REG_OFFSET;                                     \
 112     (FS)->cfa_reg = 30;                                                 \
 113     (FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa;                \
 114     for (i_ = 0; i_ < 30; ++i_)                                         \
 115       {                                                                 \
 116         (FS)->regs.reg[i_].how = REG_SAVED_OFFSET;                      \
 117         (FS)->regs.reg[i_].loc.offset                                   \
 118           = (long)&sc_->sc_regs[i_] - new_cfa_;                         \
 119       }                                                                 \
 120     for (i_ = 0; i_ < 31; ++i_)                                         \
 121       {                                                                 \
 122         (FS)->regs.reg[i_+32].how = REG_SAVED_OFFSET;                   \
 123         (FS)->regs.reg[i_+32].loc.offset                                \
 124           = (long)&sc_->sc_fpregs[i_] - new_cfa_;                       \
 125       }                                                                 \
 126     (FS)->regs.reg[64].how = REG_SAVED_OFFSET;                          \
 127     (FS)->regs.reg[64].loc.offset = (long)&sc_->sc_pc - new_cfa_;       \
 128     (FS)->retaddr_column = 64;                                          \
 129     goto SUCCESS;                                                       \
 130   } while (0)