1/* Common configuration file for NetBSD a.out targets.
2   Copyright (C) 2002 Free Software Foundation, Inc.
3   Contributed by Wasabi Systems, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to
19the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20Boston, MA 02110-1301, USA.  */
21
22/* TARGET_OS_CPP_BUILTINS() common to all NetBSD a.out targets.  */
23#define NETBSD_OS_CPP_BUILTINS_AOUT()		\
24  do						\
25    {						\
26      NETBSD_OS_CPP_BUILTINS_COMMON();		\
27    }						\
28  while (0)
29
30/* This defines which switch letters take arguments.  */
31
32#undef SWITCH_TAKES_ARG
33#define SWITCH_TAKES_ARG(CHAR)		\
34  (DEFAULT_SWITCH_TAKES_ARG(CHAR)	\
35   || (CHAR) == 'R')
36
37
38/* Provide an ASM_SPEC appropriate for NetBSD.  Currently we only deal
39   with the options for generating PIC code.  */
40
41#undef ASM_SPEC
42#define ASM_SPEC "%{fpic|fpie:-k} %{fPIC|fPIE:-k -K}"
43
44#define AS_NEEDS_DASH_FOR_PIPED_INPUT
45
46
47/* Provide a STARTFILE_SPEC appropriate for NetBSD a.out.  Here we
48   provide support for the special GCC option -static.  */
49
50#undef STARTFILE_SPEC
51#define STARTFILE_SPEC			\
52  "%{!shared:				\
53     %{pg:gcrt0%O%s}			\
54     %{!pg:				\
55       %{p:mcrt0%O%s}			\
56       %{!p:				\
57	 %{!static:crt0%O%s}		\
58	 %{static:scrt0%O%s}}}}"
59
60/* Provide a LINK_SPEC appropriate for NetBSD a.out.  Here we provide
61   support for the special GCC options -static, -assert, and -nostdlib.  */
62
63#undef NETBSD_LINK_SPEC_AOUT
64#define NETBSD_LINK_SPEC_AOUT		\
65  "%{nostdlib:-nostdlib}		\
66   %{!shared:				\
67     %{!nostdlib:			\
68       %{!r*:				\
69	 %{!e*:-e start}}}		\
70     -dc -dp				\
71     %{static:-Bstatic}}		\
72   %{shared:-Bshareable}		\
73   %{R*}				\
74   %{assert*}"
75
76/* Default LINK_SPEC.  */
77#undef LINK_SPEC
78#define LINK_SPEC NETBSD_LINK_SPEC_AOUT
79
80/* Some imports from svr4.h in support of shared libraries.  */
81
82/* Define the strings used for the .type, .size, and .set directives.
83   These strings generally do not vary from one system running NetBSD
84   to another, but if a given system needs to use different pseudo-op
85   names for these, they may be overridden in the file included after
86   this one.  */
87
88#undef TYPE_ASM_OP
89#undef SIZE_ASM_OP
90#undef SET_ASM_OP
91#define TYPE_ASM_OP	"\t.type\t"
92#define SIZE_ASM_OP	"\t.size\t"
93#define SET_ASM_OP	"\t.set\t"
94
95
96/* This is how we tell the assembler that a symbol is weak.  */
97
98#undef ASM_WEAKEN_LABEL
99#define ASM_WEAKEN_LABEL(FILE,NAME)					\
100  do 									\
101    {									\
102      fputs ("\t.globl\t", FILE); assemble_name (FILE, NAME);		\
103      fputc ('\n', FILE);						\
104      fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME);		\
105      fputc ('\n', FILE);						\
106    }									\
107  while (0)
108
109
110/* The following macro defines the format used to output the second
111   operand of the .type assembler directive.  Different svr4 assemblers
112   expect various different forms of this operand.  The one given here
113   is just a default.  You may need to override it in your machine-
114   specific tm.h file (depending on the particulars of your assembler).  */
115
116#undef TYPE_OPERAND_FMT
117#define TYPE_OPERAND_FMT	"@%s"
118
119
120/* Write the extra assembler code needed to declare a function's result.
121   Most svr4 assemblers don't require any special declaration of the
122   result value, but there are exceptions.  */
123
124#ifndef ASM_DECLARE_RESULT
125#define ASM_DECLARE_RESULT(FILE, RESULT)
126#endif
127
128
129/* These macros generate the special .type and .size directives which
130   are used to set the corresponding fields of the linker symbol table
131   entries in an ELF object file under SVR4 (and a.out on NetBSD).
132   These macros also output the starting labels for the relevant
133   functions/objects.  */
134
135/* Write the extra assembler code needed to declare a function properly.
136   Some svr4 assemblers need to also have something extra said about the
137   function's return value.  We allow for that here.  */
138
139#undef ASM_DECLARE_FUNCTION_NAME
140#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)			\
141  do									\
142    {									\
143      ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");		\
144      ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));			\
145      ASM_OUTPUT_LABEL(FILE, NAME);					\
146    }									\
147  while (0)
148
149
150/* Write the extra assembler code needed to declare an object properly.  */
151
152#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)		\
153  do								\
154    {								\
155      HOST_WIDE_INT size;					\
156								\
157      ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");		\
158								\
159      size_directive_output = 0;				\
160      if (!flag_inhibit_size_directive				\
161	  && (DECL) && DECL_SIZE (DECL))			\
162	{							\
163	  size_directive_output = 1;				\
164	  size = int_size_in_bytes (TREE_TYPE (DECL));		\
165	  ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);		\
166	}							\
167								\
168      ASM_OUTPUT_LABEL (FILE, NAME);				\
169    }								\
170  while (0)
171
172/* Output the size directive for a decl in rest_of_decl_compilation
173   in the case where we did not do so before the initializer.
174   Once we find the error_mark_node, we know that the value of
175   size_directive_output was set
176   by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
177
178#undef ASM_FINISH_DECLARE_OBJECT
179#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)	\
180  do									\
181    {									\
182      const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);		\
183      HOST_WIDE_INT size;						\
184      if (!flag_inhibit_size_directive && DECL_SIZE (DECL)		\
185	  && ! AT_END && TOP_LEVEL					\
186	  && DECL_INITIAL (DECL) == error_mark_node			\
187	  && !size_directive_output)					\
188	{								\
189	  size_directive_output = 1;					\
190	  size = int_size_in_bytes (TREE_TYPE (DECL));			\
191	  ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);			\
192	}								\
193    }									\
194  while (0)
195
196
197/* This is how to declare the size of a function.  */
198
199#undef ASM_DECLARE_FUNCTION_SIZE
200#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)			\
201  do									\
202    {									\
203      if (!flag_inhibit_size_directive)					\
204	ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);				\
205    }									\
206  while (0)
207