1  /* Definitions of target machine for GNU compiler.
       2     MIPS SDE version.
       3     Copyright (C) 2003-2023 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 3, 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 COPYING3.  If not see
      19  <http://www.gnu.org/licenses/>.  */
      20  
      21  #undef DRIVER_SELF_SPECS
      22  #define DRIVER_SELF_SPECS						\
      23    /* Set the ISA for the default multilib.  */				\
      24    MIPS_DEFAULT_ISA_LEVEL_SPEC,						\
      25  									\
      26    /* Make sure a -mips option is present.  This helps us to pick	\
      27       the right multilib, and also makes the later specs easier		\
      28       to write.  */							\
      29    MIPS_ISA_LEVEL_SPEC,							\
      30  									\
      31    /* Infer the default float setting from -march.  */			\
      32    MIPS_ARCH_FLOAT_SPEC,							\
      33  									\
      34    /* If no ABI option is specified, infer one from the ISA level	\
      35       or -mgp setting.  */						\
      36    "%{!mabi=*: %{" MIPS_32BIT_OPTION_SPEC ": -mabi=32;: -mabi=n32}}",	\
      37  									\
      38    /* Remove a redundant -mfp64 for -mabi=n32; we want the !mfp64	\
      39       multilibs.  There's no need to check whether the architecture	\
      40       is 64-bit; cc1 will complain if it isn't.  */			\
      41    "%{mabi=n32: %<mfp64}",						\
      42  									\
      43    /* Make sure that an endian option is always present.  This makes	\
      44       things like LINK_SPEC easier to write.  */				\
      45    "%{!EB:%{!EL:%(endian_spec)}}",					\
      46  									\
      47    /* Configuration-independent MIPS rules.  */				\
      48    BASE_DRIVER_SELF_SPECS				
      49  
      50  /* Use trap rather than break for all but MIPS I ISA.  Force -no-mips16,
      51     so that MIPS16 assembler code requires an explicit ".set mips16".
      52     Very little hand-written MIPS16 assembler exists, and some build
      53     systems expect code to be assembled as non-MIPS16 even if the
      54     prevailing compiler flags select -mips16.  */
      55  #undef SUBTARGET_ASM_SPEC
      56  #define SUBTARGET_ASM_SPEC "\
      57  %{!mips1:--trap} \
      58  %{mips16:-no-mips16}"
      59  
      60  #undef LINK_SPEC
      61  #define LINK_SPEC "\
      62  %(endian_spec) \
      63  %{G*} %{mips1} %{mips2} %{mips3} %{mips4} %{mips32*} %{mips64*} \
      64  %{shared} \
      65  %{mabi=n32:-melf32%{EB:b}%{EL:l}tsmipn32} \
      66  %{mabi=64:-melf64%{EB:b}%{EL:l}tsmip} \
      67  %{mabi=32:-melf32%{EB:b}%{EL:l}tsmip}"
      68  
      69  #undef DEFAULT_SIGNED_CHAR
      70  #define DEFAULT_SIGNED_CHAR 0
      71  
      72  /* Describe how we implement __builtin_eh_return.  */
      73  
      74  /* At the moment, nothing appears to use more than 2 EH data registers.
      75     The chosen registers must not clash with the return register ($2),
      76     EH_RETURN_STACKADJ ($3), or MIPS_EPILOGUE_TEMP ($5), and they must
      77     be general MIPS16 registers.  Pick $6 and $7.  */
      78  #undef EH_RETURN_DATA_REGNO
      79  #define EH_RETURN_DATA_REGNO(N) \
      80    ((N) < 2 ? 7 - (N) : INVALID_REGNUM)
      81  
      82  /* Use $5 as a temporary for both MIPS16 and non-MIPS16.  */
      83  #undef MIPS_EPILOGUE_TEMP_REGNUM
      84  #define MIPS_EPILOGUE_TEMP_REGNUM \
      85    (cfun->machine->interrupt_handler_p ? K0_REG_NUM : GP_REG_FIRST + 5)
      86  
      87  /* Using long will always be right for size_t and ptrdiff_t, since
      88     sizeof(long) must equal sizeof(void *), following from the setting
      89     of the -mlong64 option.  */
      90  #undef SIZE_TYPE
      91  #define SIZE_TYPE "long unsigned int"
      92  #undef PTRDIFF_TYPE
      93  #define PTRDIFF_TYPE "long int"
      94  
      95  /* Force all .init and .fini entries to be 32-bit, not mips16, so that
      96     in a mixed environment they are all the same mode. The crti.asm and
      97     crtn.asm files will also be compiled as 32-bit due to the
      98     -no-mips16 flag in SUBTARGET_ASM_SPEC above. */
      99  #undef CRT_CALL_STATIC_FUNCTION
     100  #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
     101     asm (SECTION_OP "\n\
     102  	.set push\n\
     103  	.set nomips16\n\
     104  	jal " USER_LABEL_PREFIX #FUNC "\n\
     105  	.set pop\n\
     106  	" TEXT_SECTION_ASM_OP);