1  /* Definitions for Intel 386 systems using GNU userspace.
       2     Copyright (C) 1994-2023 Free Software Foundation, Inc.
       3     Contributed by Eric Youngdale.
       4     Modified for stabs-in-ELF by H.J. Lu.
       5  
       6  This file is part of GCC.
       7  
       8  GCC 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 3, or (at your option)
      11  any later version.
      12  
      13  GCC 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 GCC; see the file COPYING3.  If not see
      20  <http://www.gnu.org/licenses/>.  */
      21  
      22  /* Output at beginning of assembler file.  */
      23  /* The .file command should always begin the output.  */
      24  #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
      25  
      26  #undef ASM_COMMENT_START
      27  #define ASM_COMMENT_START "#"
      28  
      29  #undef DEBUGGER_REGNO
      30  #define DEBUGGER_REGNO(n) \
      31    (TARGET_64BIT ? debugger64_register_map[n] : svr4_debugger_register_map[n])
      32  
      33  /* Output assembler code to FILE to call the profiler.
      34     To the best of my knowledge, no GNU userspace libc has required the label
      35     argument to mcount.  */
      36  
      37  #define NO_PROFILE_COUNTERS	1
      38  
      39  #undef MCOUNT_NAME
      40  #define MCOUNT_NAME "mcount"
      41  
      42  #undef SIZE_TYPE
      43  #define SIZE_TYPE "unsigned int"
      44   
      45  #undef PTRDIFF_TYPE
      46  #define PTRDIFF_TYPE "int"
      47    
      48  #undef WCHAR_TYPE
      49  #define WCHAR_TYPE "long int"
      50     
      51  #undef WCHAR_TYPE_SIZE
      52  #define WCHAR_TYPE_SIZE BITS_PER_WORD
      53      
      54  /* Provide a LINK_SPEC appropriate for GNU userspace.  Here we provide support
      55     for the special GCC options -static and -shared, which allow us to
      56     link things in one of these three modes by applying the appropriate
      57     combinations of options at link-time.
      58  
      59     When the -shared link option is used a final link is not being
      60     done.  */
      61  
      62  #undef  ASM_SPEC
      63  #define ASM_SPEC \
      64    "--32 %{msse2avx:%{!mavx:-msse2avx}}"
      65  
      66  #undef  SUBTARGET_EXTRA_SPECS
      67  #define SUBTARGET_EXTRA_SPECS \
      68    { "link_emulation", GNU_USER_LINK_EMULATION },\
      69    { "dynamic_linker", GNU_USER_DYNAMIC_LINKER }
      70  
      71  #define GNU_USER_TARGET_LINK_SPEC "-m %(link_emulation) %{shared:-shared} \
      72    %{!shared: \
      73      %{!static: \
      74        %{!static-pie: \
      75  	%{rdynamic:-export-dynamic} \
      76  	-dynamic-linker %(dynamic_linker)}} \
      77      %{static:-static} %{static-pie:-static -pie --no-dynamic-linker -z text}}"
      78  
      79  #undef	LINK_SPEC
      80  #define LINK_SPEC GNU_USER_TARGET_LINK_SPEC
      81  
      82  /* A C statement (sans semicolon) to output to the stdio stream
      83     FILE the assembler definition of uninitialized global DECL named
      84     NAME whose size is SIZE bytes and alignment is ALIGN bytes.
      85     Try to use asm_output_aligned_bss to implement this macro.  */
      86  
      87  #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
      88    asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
      89  
      90  /* A C statement to output to the stdio stream FILE an assembler
      91     command to advance the location counter to a multiple of 1<<LOG
      92     bytes if it is within MAX_SKIP bytes.  */
      93  
      94  #define SUBALIGN_LOG 3
      95  
      96  /* Handle special EH pointer encodings.  Absolute, pc-relative, and
      97     indirect are handled automatically.  */
      98  #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
      99    do {									\
     100      if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel)		\
     101        {									\
     102          fputs (ASM_LONG, FILE);			\
     103          assemble_name (FILE, XSTR (ADDR, 0));				\
     104  	fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
     105          goto DONE;							\
     106        }									\
     107    } while (0)
     108  
     109  #ifdef TARGET_LIBC_PROVIDES_SSP
     110  /* i386 glibc provides __stack_chk_guard in %gs:0x14.  */
     111  #define TARGET_THREAD_SSP_OFFSET	0x14
     112  
     113  /* i386 glibc provides __private_ss in %gs:0x30.  */
     114  #define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30
     115  #endif