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