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Annotation of gcc/config/i386/svr3dbx.h, revision 1.1.1.2

1.1       root        1: /* Definitions for Intel 386 running system V, using dbx-in-coff encapsulation.
1.1.1.2 ! root        2:    Copyright (C) 1992, 1995 Free Software Foundation, Inc.
1.1       root        3: 
                      4: This file is part of GNU CC.
                      5: 
                      6: GNU CC is free software; you can redistribute it and/or modify
                      7: it under the terms of the GNU General Public License as published by
                      8: the Free Software Foundation; either version 2, or (at your option)
                      9: any later version.
                     10: 
                     11: GNU CC is distributed in the hope that it will be useful,
                     12: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     14: GNU General Public License for more details.
                     15: 
                     16: You should have received a copy of the GNU General Public License
                     17: along with GNU CC; see the file COPYING.  If not, write to
1.1.1.2 ! root       18: the Free Software Foundation, 59 Temple Place - Suite 330,
        !            19: Boston, MA 02111-1307, USA.  */
1.1       root       20: 
                     21: #include "i386/svr3gas.h"
                     22: 
                     23: /* We do not want to output SDB debugging information.  */
                     24: 
                     25: #undef SDB_DEBUGGING_INFO
                     26: 
                     27: /* We want to output DBX debugging information.  */
                     28: 
                     29: #define DBX_DEBUGGING_INFO
                     30: 
                     31: /* Compensate for botch in dbxout_init/dbxout_source_file which
                     32:    unconditionally drops the first character from ltext_label_name */
                     33: 
                     34: #undef ASM_GENERATE_INTERNAL_LABEL
                     35: #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
                     36:     sprintf ((BUF), "*.%s%d", (PREFIX), (NUMBER))
                     37: 
                     38: /* With the current gas, .align N aligns to an N-byte boundary.
                     39:    This is done to be compatible with the system assembler.
1.1.1.2 ! root       40:    You must specify -DOTHER_ALIGN when building gas-1.38.1.  */
1.1       root       41: 
                     42: #undef ASM_OUTPUT_ALIGN
                     43: #define ASM_OUTPUT_ALIGN(FILE,LOG)     \
                     44:      if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
                     45: 
                     46: /* Align labels, etc. at 4-byte boundaries.
                     47:    For the 486, align to 16-byte boundary for sake of cache.  */
                     48: 
                     49: #undef ASM_OUTPUT_ALIGN_CODE
                     50: #define ASM_OUTPUT_ALIGN_CODE(FILE)                    \
                     51:      fprintf ((FILE), "\t.align %d,0x90\n",            \
1.1.1.2 ! root       52:              1 << i386_align_jumps)
1.1       root       53: 
                     54: /* Align start of loop at 4-byte boundary.  */
                     55: 
                     56: #undef ASM_OUTPUT_LOOP_ALIGN
                     57: #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
1.1.1.2 ! root       58:      fprintf ((FILE), "\t.align %d,0x90\n", 1 << i386_align_loops);
1.1       root       59: 
                     60: 
                     61: /* Additional overrides needed for dbx-in-coff gas, mostly taken from pbb.h */
                     62: 
                     63: /* Although the gas we use can create .ctor and .dtor sections from N_SETT
                     64:    stabs, it does not support section directives, so we need to have the loader
                     65:    define the lists.
                     66:  */
                     67: #define CTOR_LISTS_DEFINED_EXTERNALLY
                     68: 
                     69: /* similar to default, but allows for the table defined by ld with svr3.ifile. 
                     70:    nptrs is always 0.  So we need to instead check that __DTOR_LIST__[1] != 0.
                     71:    The old check is left in so that the same macro can be used if and when  
                     72:    a future version of gas does support section directives. */
                     73: 
                     74: #define DO_GLOBAL_DTORS_BODY {int nptrs = *(int *)__DTOR_LIST__; int i; \
                     75:   if (nptrs == -1 || (__DTOR_LIST__[0] == 0 && __DTOR_LIST__[1] != 0))  \
                     76:     for (nptrs = 0; __DTOR_LIST__[nptrs + 1] != 0; nptrs++);           \
                     77:   for (i = nptrs; i >= 1; i--)                                         \
                     78:     __DTOR_LIST__[i] (); }
                     79: 
                     80: /* Use crt1.o as a startup file and crtn.o as a closing file.  */
                     81: /*
                     82:  * The loader directive file svr3.ifile defines how to merge the constructor 
                     83:  * sections into the data section.  Also, since gas only puts out those 
                     84:  * sections in response to N_SETT stabs, and does not (yet) have a 
                     85:  * ".sections" directive, svr3.ifile also defines the list symbols 
                     86:  * __DTOR_LIST__ and __CTOR_LIST__.
                     87:  */
                     88: #undef STARTFILE_SPEC
                     89: #define STARTFILE_SPEC \
                     90:   "%{!r:%{!z:svr3.ifile%s}%{z:svr3z.ifile%s}}\
                     91:    %{pg:gcrt1.o%s}%{!pg:%{posix:%{p:mcrtp1.o%s}%{!p:crtp1.o%s}}%{!posix:%{p:mcrt1.o%s}%{!p:crt1.o%s}}} \
                     92:    %{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp}"
                     93:   
                     94: #define ENDFILE_SPEC "crtn.o%s"
                     95:   
                     96: #undef LIB_SPEC
                     97: #define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc -lg"

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