gcc/config/mips/linux.h

   1 /* Definitions for MIPS running Linux-based GNU systems with ELF format.
   2    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #undef WCHAR_TYPE
  23 #define WCHAR_TYPE "int"
  24
  25 #undef WCHAR_TYPE_SIZE
  26 #define WCHAR_TYPE_SIZE 32
  27
  28 /* If defined, a C expression whose value is a string containing the
  29    assembler operation to identify the following data as
  30    uninitialized global data.  If not defined, and neither
  31    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
  32    uninitialized global data will be output in the data section if
  33    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
  34    used.  */
  35 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
  36
  37 #define ASM_OUTPUT_ALIGNED_BSS mips_output_aligned_bss
  38
  39 #undef ASM_DECLARE_OBJECT_NAME
  40 #define ASM_DECLARE_OBJECT_NAME mips_declare_object_name
  41
  42 #undef TARGET_VERSION
  43 #if TARGET_ENDIAN_DEFAULT == 0
  44 #define TARGET_VERSION fprintf (stderr, " (MIPSel GNU/Linux with ELF)");
  45 #else
  46 #define TARGET_VERSION fprintf (stderr, " (MIPS GNU/Linux with ELF)");
  47 #endif
  48
  49 #undef MD_EXEC_PREFIX
  50 #undef MD_STARTFILE_PREFIX
  51
  52 /* If we don't set MASK_ABICALLS, we can't default to PIC.  */
  53 #undef TARGET_DEFAULT
  54 #define TARGET_DEFAULT (MASK_ABICALLS|MASK_GAS)
  55
  56 #define TARGET_OS_CPP_BUILTINS()                                \
  57     do {                                                        \
  58         builtin_define ("__gnu_linux__");                       \
  59         builtin_define ("__PIC__");                             \
  60         builtin_define ("__pic__");                             \
  61         builtin_define_std ("unix");                            \
  62         builtin_define_std ("linux");                           \
  63         builtin_assert ("system=linux");                        \
  64         /* The GNU C++ standard library requires this.  */      \
  65         if (c_dialect_cxx ())                                   \
  66           builtin_define ("_GNU_SOURCE");                       \
  67                                                                 \
  68       if (mips_abi == ABI_N32)                                  \
  69       {                                                         \
  70         builtin_define ("_ABIN32=2");                           \
  71         builtin_define ("_MIPS_SIM=_ABIN32");                   \
  72         builtin_define ("_MIPS_SZLONG=32");                     \
  73         builtin_define ("_MIPS_SZPTR=32");                      \
  74       }                                                         \
  75      else if (mips_abi == ABI_64)                               \
  76       {                                                         \
  77         builtin_define ("_ABI64=3");                            \
  78         builtin_define ("_MIPS_SIM=_ABI64");                    \
  79         builtin_define ("_MIPS_SZLONG=64");                     \
  80         builtin_define ("_MIPS_SZPTR=64");                      \
  81       }                                                         \
  82      else                                                       \
  83       {                                                         \
  84         builtin_define ("_ABIO32=1");                   \
  85         builtin_define ("_MIPS_SIM=_ABIO32");           \
  86         builtin_define ("_MIPS_SZLONG=32");                     \
  87         builtin_define ("_MIPS_SZPTR=32");                      \
  88       }                                                         \
  89      if (TARGET_FLOAT64)                                        \
  90         builtin_define ("_MIPS_FPSET=32");                      \
  91      else                                                       \
  92         builtin_define ("_MIPS_FPSET=16");                      \
  93                                                                 \
  94      if (TARGET_INT64)                                          \
  95         builtin_define ("_MIPS_SZINT=64");                      \
  96      else                                                       \
  97         builtin_define ("_MIPS_SZINT=32");                      \
  98 } while (0)
  99
 100 #undef  SUBTARGET_CPP_SPEC
 101 #define SUBTARGET_CPP_SPEC "\
 102 %{fno-PIC:-U__PIC__ -U__pic__} %{fno-pic:-U__PIC__ -U__pic__} \
 103 %{fPIC|fPIE|fpic|fpie:-D__PIC__ -D__pic__} \
 104 %{pthread:-D_REENTRANT}"
 105
 106 /* From iris5.h */
 107 /* -G is incompatible with -KPIC which is the default, so only allow objects
 108    in the small data section if the user explicitly asks for it.  */
 109 #undef MIPS_DEFAULT_GVALUE
 110 #define MIPS_DEFAULT_GVALUE 0
 111
 112 /* Borrowed from sparc/linux.h */
 113 #undef LINK_SPEC
 114 #define LINK_SPEC \
 115  "%(endian_spec) \
 116   %{shared:-shared} \
 117   %{!shared: \
 118     %{!ibcs: \
 119       %{!static: \
 120         %{rdynamic:-export-dynamic} \
 121         %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
 122         %{static:-static}}}"
 123
 124 #undef SUBTARGET_ASM_SPEC
 125 #define SUBTARGET_ASM_SPEC "\
 126 %{mabi=64: -64} \
 127 %{!fno-PIC:%{!fno-pic:-KPIC}} \
 128 %{fno-PIC:-non_shared} %{fno-pic:-non_shared}"
 129
 130 #undef  SUBTARGET_ASM_DEBUGGING_SPEC
 131 #define SUBTARGET_ASM_DEBUGGING_SPEC "-g0"
 132
 133 /* The MIPS assembler has different syntax for .set. We set it to
 134    .dummy to trap any errors.  */
 135 #undef SET_ASM_OP
 136 #define SET_ASM_OP "\t.dummy\t"
 137
 138 #undef ASM_OUTPUT_DEF
 139 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 140  do {                                                                   \
 141         fputc ( '\t', FILE);                                            \
 142         assemble_name (FILE, LABEL1);                                   \
 143         fputs ( " = ", FILE);                                           \
 144         assemble_name (FILE, LABEL2);                                   \
 145         fputc ( '\n', FILE);                                            \
 146  } while (0)
 147
 148 #undef ASM_DECLARE_FUNCTION_NAME
 149 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)                   \
 150   do {                                                                  \
 151     if (!flag_inhibit_size_directive)                                   \
 152       {                                                                 \
 153         fputs ("\t.ent\t", STREAM);                                     \
 154         assemble_name (STREAM, NAME);                                   \
 155         putc ('\n', STREAM);                                            \
 156       }                                                                 \
 157     ASM_OUTPUT_TYPE_DIRECTIVE (STREAM, NAME, "function");               \
 158     assemble_name (STREAM, NAME);                                       \
 159     fputs (":\n", STREAM);                                              \
 160   } while (0)
 161
 162 #undef ASM_DECLARE_FUNCTION_SIZE
 163 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL)                   \
 164   do {                                                                  \
 165     if (!flag_inhibit_size_directive)                                   \
 166       {                                                                 \
 167         fputs ("\t.end\t", STREAM);                                     \
 168         assemble_name (STREAM, NAME);                                   \
 169         putc ('\n', STREAM);                                            \
 170       }                                                                 \
 171   } while (0)
 172
 173 /* Tell function_prologue in mips.c that we have already output the .ent/.end
 174    pseudo-ops.  */
 175 #undef FUNCTION_NAME_ALREADY_DECLARED
 176 #define FUNCTION_NAME_ALREADY_DECLARED 1
 177
 178 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)                      \
 179   (flag_pic                                                             \
 180     ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4\
 181    : DW_EH_PE_absptr)
 182
 183 /* The glibc _mcount stub will save $v0 for us.  Don't mess with saving
 184    it, since ASM_OUTPUT_REG_PUSH/ASM_OUTPUT_REG_POP do not work in the
 185    presence of $gp-relative calls.  */
 186 #undef ASM_OUTPUT_REG_PUSH
 187 #undef ASM_OUTPUT_REG_POP
 188
 189 #undef LIB_SPEC
 190 #define LIB_SPEC "\
 191 %{shared: -lc} \
 192 %{!static:-rpath-link %R/lib:%R/usr/lib} \
 193 %{!shared: %{pthread:-lpthread} \
 194   %{profile:-lc_p} %{!profile: -lc}}"
 195
 196 /* Do code reading to identify a signal frame, and set the frame
 197    state data appropriately.  See unwind-dw2.c for the structs.  */
 198 #ifdef IN_LIBGCC2
 199 #include <signal.h>
 200
 201 /* The third parameter to the signal handler points to something with
 202  * this structure defined in asm/ucontext.h, but the name clashes with
 203  * struct ucontext from sys/ucontext.h so this private copy is used. */
 204 typedef struct _sig_ucontext {
 205     unsigned long         uc_flags;
 206     struct _sig_ucontext  *uc_link;
 207     stack_t               uc_stack;
 208     struct sigcontext uc_mcontext;
 209     sigset_t      uc_sigmask;
 210 } _sig_ucontext_t;
 211
 212 #endif /* IN_LIBGCC2  */
 213
 214 #define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS)            \
 215   do {                                                               \
 216     u_int32_t *pc_ = (u_int32_t *) (CONTEXT)->ra;                \
 217     struct sigcontext *sc_;                                          \
 218     _Unwind_Ptr new_cfa_;                                            \
 219     int i_;                                                          \
 220                                                                      \
 221     /* 24021061 li v0, 0x1061 (rt_sigreturn)*/                       \
 222     /* 0000000c syscall    */                                        \
 223     /*    or */                                                      \
 224     /* 24021017 li v0, 0x1017 (sigreturn) */                         \
 225     /* 0000000c syscall  */                                          \
 226     if (*(pc_ + 1) != 0x0000000c)                                    \
 227       break;                                                         \
 228     if (*(pc_ + 0) == 0x24021017)                                    \
 229       {                                                              \
 230         struct sigframe {                                            \
 231           u_int32_t  trampoline[2];                                \
 232           struct sigcontext sigctx;                                  \
 233         } *rt_ = (CONTEXT)->ra;                                      \
 234         sc_ = &rt_->sigctx;                                          \
 235       }                                                              \
 236     else if (*(pc_ + 0) == 0x24021061)                               \
 237       {                                                              \
 238         struct rt_sigframe {                                         \
 239           u_int32_t  trampoline[2];                                \
 240           struct siginfo info;                                       \
 241           _sig_ucontext_t uc;                                        \
 242         } *rt_ = (CONTEXT)->ra;                                      \
 243         sc_ = &rt_->uc.uc_mcontext;                                  \
 244       }                                                              \
 245     else                                                             \
 246       break;                                                         \
 247                                                                      \
 248     new_cfa_ = (_Unwind_Ptr)sc_;                                     \
 249     (FS)->cfa_how = CFA_REG_OFFSET;                                  \
 250     (FS)->cfa_reg = STACK_POINTER_REGNUM;                            \
 251     (FS)->cfa_offset = new_cfa_ - (_Unwind_Ptr) (CONTEXT)->cfa;      \
 252                                                                      \
 253     for (i_ = 0; i_ < 32; i_++) {                                    \
 254       (FS)->regs.reg[i_].how = REG_SAVED_OFFSET;                     \
 255       (FS)->regs.reg[i_].loc.offset                                  \
 256         = (_Unwind_Ptr)&(sc_->sc_regs[i_]) - new_cfa_;               \
 257     }                                                                \
 258     (FS)->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].how = REG_SAVED_OFFSET; \
 259     (FS)->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].loc.offset           \
 260         = (_Unwind_Ptr)&(sc_->sc_pc) - new_cfa_;                     \
 261     (FS)->retaddr_column = SIGNAL_UNWIND_RETURN_COLUMN;              \
 262                                                                      \
 263     goto SUCCESS;                                                    \
 264   } while (0)