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 ("_MIPS_SIM=_MIPS_SIM_ABI32");           \
  85         builtin_define ("_MIPS_SZLONG=32");                     \
  86         builtin_define ("_MIPS_SZPTR=32");                      \
  87       }                                                         \
  88      if (TARGET_FLOAT64)                                        \
  89         builtin_define ("_MIPS_FPSET=32");                      \
  90      else                                                       \
  91         builtin_define ("_MIPS_FPSET=16");                      \
  92                                                                 \
  93      if (TARGET_INT64)                                          \
  94         builtin_define ("_MIPS_SZINT=64");                      \
  95      else                                                       \
  96         builtin_define ("_MIPS_SZINT=32");                      \
  97 } while (0)
  98
  99 #undef  SUBTARGET_CPP_SPEC
 100 #define SUBTARGET_CPP_SPEC "\
 101 %{fno-PIC:-U__PIC__ -U__pic__} %{fno-pic:-U__PIC__ -U__pic__} \
 102 %{fPIC|fPIE|fpic|fpie:-D__PIC__ -D__pic__} \
 103 %{pthread:-D_REENTRANT}"
 104
 105 /* From iris5.h */
 106 /* -G is incompatible with -KPIC which is the default, so only allow objects
 107    in the small data section if the user explicitly asks for it.  */
 108 #undef MIPS_DEFAULT_GVALUE
 109 #define MIPS_DEFAULT_GVALUE 0
 110
 111 /* Borrowed from sparc/linux.h */
 112 #undef LINK_SPEC
 113 #define LINK_SPEC \
 114  "%(endian_spec) \
 115   %{shared:-shared} \
 116   %{!shared: \
 117     %{!ibcs: \
 118       %{!static: \
 119         %{rdynamic:-export-dynamic} \
 120         %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
 121         %{static:-static}}}"
 122
 123 #undef SUBTARGET_ASM_SPEC
 124 #define SUBTARGET_ASM_SPEC "\
 125 %{mabi=64: -64} \
 126 %{!fno-PIC:%{!fno-pic:-KPIC}} \
 127 %{fno-PIC:-non_shared} %{fno-pic:-non_shared}"
 128
 129 #undef  SUBTARGET_ASM_DEBUGGING_SPEC
 130 #define SUBTARGET_ASM_DEBUGGING_SPEC "-g0"
 131
 132 /* The MIPS assembler has different syntax for .set. We set it to
 133    .dummy to trap any errors.  */
 134 #undef SET_ASM_OP
 135 #define SET_ASM_OP "\t.dummy\t"
 136
 137 #undef ASM_OUTPUT_DEF
 138 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 139  do {                                                                   \
 140         fputc ( '\t', FILE);                                            \
 141         assemble_name (FILE, LABEL1);                                   \
 142         fputs ( " = ", FILE);                                           \
 143         assemble_name (FILE, LABEL2);                                   \
 144         fputc ( '\n', FILE);                                            \
 145  } while (0)
 146
 147 #undef ASM_DECLARE_FUNCTION_NAME
 148 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)                   \
 149   do {                                                                  \
 150     if (!flag_inhibit_size_directive)                                   \
 151       {                                                                 \
 152         fputs ("\t.ent\t", STREAM);                                     \
 153         assemble_name (STREAM, NAME);                                   \
 154         putc ('\n', STREAM);                                            \
 155       }                                                                 \
 156     ASM_OUTPUT_TYPE_DIRECTIVE (STREAM, NAME, "function");               \
 157     assemble_name (STREAM, NAME);                                       \
 158     fputs (":\n", STREAM);                                              \
 159   } while (0)
 160
 161 #undef ASM_DECLARE_FUNCTION_SIZE
 162 #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL)                   \
 163   do {                                                                  \
 164     if (!flag_inhibit_size_directive)                                   \
 165       {                                                                 \
 166         fputs ("\t.end\t", STREAM);                                     \
 167         assemble_name (STREAM, NAME);                                   \
 168         putc ('\n', STREAM);                                            \
 169       }                                                                 \
 170   } while (0)
 171
 172 /* Tell function_prologue in mips.c that we have already output the .ent/.end
 173    pseudo-ops.  */
 174 #define FUNCTION_NAME_ALREADY_DECLARED
 175
 176 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)                      \
 177   (flag_pic                                                             \
 178     ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4\
 179    : DW_EH_PE_absptr)
 180
 181 /* The glibc _mcount stub will save $v0 for us.  Don't mess with saving
 182    it, since ASM_OUTPUT_REG_PUSH/ASM_OUTPUT_REG_POP do not work in the
 183    presence of $gp-relative calls.  */
 184 #undef ASM_OUTPUT_REG_PUSH
 185 #undef ASM_OUTPUT_REG_POP
 186
 187 #undef LIB_SPEC
 188 #define LIB_SPEC "\
 189 %{shared: -lc} \
 190 %{!static:-rpath-link %R/lib:%R/usr/lib} \
 191 %{!shared: %{pthread:-lpthread} \
 192   %{profile:-lc_p} %{!profile: -lc}}"
 193
 194 /* Do code reading to identify a signal frame, and set the frame
 195    state data appropriately.  See unwind-dw2.c for the structs.  */
 196 #ifdef IN_LIBGCC2
 197 #include <signal.h>
 198
 199 /* The third parameter to the signal handler points to something with
 200  * this structure defined in asm/ucontext.h, but the name clashes with
 201  * struct ucontext from sys/ucontext.h so this private copy is used. */
 202 typedef struct _sig_ucontext {
 203     unsigned long         uc_flags;
 204     struct _sig_ucontext  *uc_link;
 205     stack_t               uc_stack;
 206     struct sigcontext uc_mcontext;
 207     sigset_t      uc_sigmask;
 208 } _sig_ucontext_t;
 209
 210 #endif /* IN_LIBGCC2  */
 211
 212 #define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS)            \
 213   do {                                                               \
 214     u_int32_t *pc_ = (u_int32_t *) (CONTEXT)->ra;                \
 215     struct sigcontext *sc_;                                          \
 216     _Unwind_Ptr new_cfa_;                                            \
 217     int i_;                                                          \
 218                                                                      \
 219     /* 24021061 li v0, 0x1061 (rt_sigreturn)*/                       \
 220     /* 0000000c syscall    */                                        \
 221     /*    or */                                                      \
 222     /* 24021017 li v0, 0x1017 (sigreturn) */                         \
 223     /* 0000000c syscall  */                                          \
 224     if (*(pc_ + 1) != 0x0000000c)                                    \
 225       break;                                                         \
 226     if (*(pc_ + 0) == 0x24021017)                                    \
 227       {                                                              \
 228         struct sigframe {                                            \
 229           u_int32_t  trampoline[2];                                \
 230           struct sigcontext sigctx;                                  \
 231         } *rt_ = (CONTEXT)->ra;                                      \
 232         sc_ = &rt_->sigctx;                                          \
 233       }                                                              \
 234     else if (*(pc_ + 0) == 0x24021061)                               \
 235       {                                                              \
 236         struct rt_sigframe {                                         \
 237           u_int32_t  trampoline[2];                                \
 238           struct siginfo info;                                       \
 239           _sig_ucontext_t uc;                                        \
 240         } *rt_ = (CONTEXT)->ra;                                      \
 241         sc_ = &rt_->uc.uc_mcontext;                                  \
 242       }                                                              \
 243     else                                                             \
 244       break;                                                         \
 245                                                                      \
 246     new_cfa_ = (_Unwind_Ptr)sc_;                                     \
 247     (FS)->cfa_how = CFA_REG_OFFSET;                                  \
 248     (FS)->cfa_reg = STACK_POINTER_REGNUM;                            \
 249     (FS)->cfa_offset = new_cfa_ - (_Unwind_Ptr) (CONTEXT)->cfa;      \
 250                                                                      \
 251     for (i_ = 0; i_ < 32; i_++) {                                    \
 252       (FS)->regs.reg[i_].how = REG_SAVED_OFFSET;                     \
 253       (FS)->regs.reg[i_].loc.offset                                  \
 254         = (_Unwind_Ptr)&(sc_->sc_regs[i_]) - new_cfa_;               \
 255     }                                                                \
 256     (FS)->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].how = REG_SAVED_OFFSET; \
 257     (FS)->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].loc.offset           \
 258         = (_Unwind_Ptr)&(sc_->sc_pc) - new_cfa_;                     \
 259     (FS)->retaddr_column = SIGNAL_UNWIND_RETURN_COLUMN;              \
 260                                                                      \
 261     goto SUCCESS;                                                    \
 262   } while (0)