1 /* m68kelf support, derived from m68kv4.h */
3 /* Target definitions for GNU compiler for mc680x0 running System V.4
4 Copyright (C) 1991, 1993 Free Software Foundation, Inc.
6 Written by Ron Guilmette (rfg@netcom.com) and Fred Fish (fnf@cygnus.com).
8 This file is part of GNU CC.
10 GNU CC is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
15 GNU CC is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with GNU CC; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
24 /* #notinclude "m68k/sgs.h" /* The m68k/SVR4 assembler is SGS based */
26 /* These are necessary for -fpic/-fPIC to work correctly. */
28 #define MOTOROLA /* Use MOTOROLA syntax. */
30 #ifdef USE_GAS /* when present, forces jsbr instead of jsr. */
35 #define SWBEG_ASM_OP ".swbeg"
38 /* Here are four prefixes that are used by asm_fprintf to
39 facilitate customization for alternate assembler syntaxes.
40 Machines with no likelihood of an alternate syntax need not
41 define these and need not use asm_fprintf. */
43 /* The prefix for register names. Note that REGISTER_NAMES
44 is supposed to include this prefix. Also note that this is NOT an
45 fprintf format string, it is a literal string */
47 #undef REGISTER_PREFIX
48 #define REGISTER_PREFIX "%"
50 /* The prefix for local (compiler generated) labels.
51 These labels will not appear in the symbol table. */
53 #undef LOCAL_LABEL_PREFIX
54 #define LOCAL_LABEL_PREFIX "."
56 /* The prefix to add to user-visible assembler symbols. */
58 #undef USER_LABEL_PREFIX
59 #define USER_LABEL_PREFIX ""
61 /* The prefix for immediate operands. */
63 #undef IMMEDIATE_PREFIX
64 #define IMMEDIATE_PREFIX "#"
66 /* In the machine description we can't use %R, because it will not be seen
67 by ASM_FPRINTF. (Isn't that a design bug?). */
69 #undef REGISTER_PREFIX_MD
70 #define REGISTER_PREFIX_MD "%%"
72 /* config/m68k.md has an explicit reference to the program counter,
73 prefix this by the register prefix. */
75 #define ASM_RETURN_CASE_JUMP return "jmp %%pc@(2,%0:w)"
77 /* How to refer to registers in assembler output.
78 This sequence is indexed by compiler's hard-register-number.
79 Motorola format uses different register names than defined
84 #define REGISTER_NAMES \
85 {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \
86 "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \
87 "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" }
89 /* This is how to output an assembler line that says to advance the
90 location counter to a multiple of 2**LOG bytes. */
92 #undef ASM_OUTPUT_ALIGN
93 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
95 fprintf ((FILE), "\t%s \t%u\n", ALIGN_ASM_OP, 1 << (LOG)); \
96 else if ((LOG) > 31) \
99 /* Use proper assembler syntax for these macros. */
100 #undef ASM_OUTPUT_REG_PUSH
101 #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \
102 asm_fprintf (FILE, "\t%Omove.l %s,-(%Rsp)\n", reg_names[REGNO])
104 #undef ASM_OUTPUT_REG_POP
105 #define ASM_OUTPUT_REG_POP(FILE,REGNO) \
106 asm_fprintf (FILE, "\t%Omove.l (%Rsp)+,%s\n", reg_names[REGNO])
108 /* Override the definition of NO_DOLLAR_IN_LABEL in svr4.h, for special
109 g++ assembler names. When this is defined, g++ uses embedded '.'
110 characters and some m68k assemblers have problems with this. The
111 chances are much greater that any particular assembler will permit
112 embedded '$' characters. */
114 #undef NO_DOLLAR_IN_LABEL
116 /* Define PCC_STATIC_STRUCT_RETURN if the convention on the target machine
117 is to use the nonreentrant technique for returning structure and union
118 values, as commonly implemented by the AT&T Portable C Compiler (PCC).
119 When defined, the gcc option -fpcc-struct-return can be used to cause
120 this form to be generated. When undefined, the option does nothing.
121 For m68k SVR4, the convention is to use a reentrant technique compatible
122 with the gcc default, so override the definition of this macro in m68k.h */
124 #undef PCC_STATIC_STRUCT_RETURN
126 /* Local common symbols are declared to the assembler with ".lcomm" rather
127 than ".bss", so override the definition in svr4.h */
130 #define BSS_ASM_OP ".lcomm"
132 /* Register in which address to store a structure value is passed to a
133 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
135 #undef STRUCT_VALUE_REGNUM
136 #define STRUCT_VALUE_REGNUM 8
138 #define ASM_COMMENT_START "|"
140 #undef TYPE_OPERAND_FMT
141 #define TYPE_OPERAND_FMT "@%s"
143 /* Define how the m68k registers should be numbered for Dwarf output.
144 The numbering provided here should be compatible with the native
145 SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
146 are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */
148 #undef DBX_REGISTER_NUMBER
149 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
151 /* The ASM_OUTPUT_SKIP macro is first defined in m68k.h, using ".skip".
152 It is then overridden by m68k/sgs.h to use ".space", and again by svr4.h
153 to use ".zero". The m68k/SVR4 assembler uses ".space", so repeat the
154 definition from m68k/sgs.h here. Note that ASM_NO_SKIP_IN_TEXT is
155 defined in m68k/sgs.h, so we don't have to repeat it here. */
157 #undef ASM_OUTPUT_SKIP
158 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
159 fprintf (FILE, "\t%s %u\n", SPACE_ASM_OP, (SIZE))
162 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
163 1 byte alignment. Don't generate alignment for COMMON seems to be
164 safer until we the assembler is fixed. */
165 #undef ASM_OUTPUT_ALIGNED_COMMON
166 /* Same problem with this one. */
167 #undef ASM_OUTPUT_ALIGNED_LOCAL
170 /* The `string' directive on m68k svr4 does not handle string with
171 escape char (ie., `\') right. Use normal way to output ASCII bytes
172 seems to be safer. */
173 #undef ASM_OUTPUT_ASCII
174 #define ASM_OUTPUT_ASCII(FILE,PTR,LEN) \
176 register int sp = 0, lp = 0, ch; \
177 fprintf ((FILE), "\t%s ", BYTE_ASM_OP); \
180 if (ch > ' ' && ! (ch & 0x80) && ch != '\\') \
182 fprintf ((FILE), "'%c", ch); \
186 fprintf ((FILE), "0x%x", ch); \
190 if ((sp % 10) == 0) \
192 fprintf ((FILE), "\n\t%s ", BYTE_ASM_OP); \
196 putc (',', (FILE)); \
199 } while (sp < (LEN)); \
200 putc ('\n', (FILE)); \
203 /* SVR4 m68k assembler is bitching on the syntax `2.b'.
204 So use the "LLDnnn-LLnnn" format. Define LLDnnn after the table. */
206 #undef ASM_OUTPUT_CASE_END
207 #define ASM_OUTPUT_CASE_END(FILE,NUM,TABLE) \
209 if (switch_table_difference_label_flag) \
210 asm_fprintf ((FILE), "\t%s %LLD%d,%LL%d\n", SET_ASM_OP, (NUM), (NUM));\
211 switch_table_difference_label_flag = 0; \
214 extern int switch_table_difference_label_flag;
216 #undef ASM_OUTPUT_COMMON
217 #undef ASM_OUTPUT_LOCAL
218 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
219 ( fputs (".comm ", (FILE)), \
220 assemble_name ((FILE), (NAME)), \
221 fprintf ((FILE), ",%u\n", (SIZE)))
223 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
224 ( fputs (".lcomm ", (FILE)), \
225 assemble_name ((FILE), (NAME)), \
226 fprintf ((FILE), ",%u\n", (SIZE)))
228 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
229 keep switch tables in the text section. */
231 #define JUMP_TABLES_IN_TEXT_SECTION 1
233 /* Override the definition in svr4.h. In m68k svr4, using swbeg is the
234 standard way to do switch table. */
235 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
236 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
237 fprintf ((FILE), "\t%s &%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1));
239 /* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is an
240 operand of a function call. */
241 #undef LEGITIMATE_PIC_OPERAND_P
242 #define LEGITIMATE_PIC_OPERAND_P(X) \
243 (! symbolic_operand (X, VOIDmode) \
244 || ((GET_CODE(X) == SYMBOL_REF) && SYMBOL_REF_FLAG(X)))
246 /* Turn off function cse if we are doing PIC. We always want function call
247 to be done as `bsr foo@PLTPC', so it will force the assembler to create
248 the PLT entry for `foo'. Doing function cse will cause the address of `foo'
249 to be loaded into a register, which is exactly what we want to avoid when
250 we are doing PIC on svr4 m68k. */
251 #undef OVERRIDE_OPTIONS
252 #define OVERRIDE_OPTIONS \
254 if (flag_pic) flag_no_function_cse = 1; \
255 if (! TARGET_68020 && flag_pic == 2) \
256 error("-fPIC is not currently supported on the 68000 or 68010\n"); \
258 /* end of stuff from m68kv4.h */
263 #define ENDFILE_SPEC "crtend.o%s"
265 #undef STARTFILE_SPEC
266 #define STARTFILE_SPEC "crtbegin.o%s"