1 /* m68kelf support, derived from m68kv4.h */
3 /* Target definitions for GNU compiler for mc680x0 running System V.4
4 Copyright (C) 1991, 1993, 2000 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, 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
25 /* #notinclude "m68k/sgs.h" / * The m68k/SVR4 assembler is SGS based */
27 /* These are necessary for -fpic/-fPIC to work correctly. */
29 #define MOTOROLA /* Use MOTOROLA syntax. */
31 #ifndef USE_GAS /* forces jsbr instead of jsr. */
36 #define SWBEG_ASM_OP "\t.swbeg\t"
39 /* Here are four prefixes that are used by asm_fprintf to
40 facilitate customization for alternate assembler syntaxes.
41 Machines with no likelihood of an alternate syntax need not
42 define these and need not use asm_fprintf. */
44 /* The prefix for register names. Note that REGISTER_NAMES
45 is supposed to include this prefix. Also note that this is NOT an
46 fprintf format string, it is a literal string */
48 #undef REGISTER_PREFIX
49 #define REGISTER_PREFIX "%"
51 /* The prefix for local (compiler generated) labels.
52 These labels will not appear in the symbol table. */
54 #undef LOCAL_LABEL_PREFIX
55 #define LOCAL_LABEL_PREFIX "."
57 /* The prefix to add to user-visible assembler symbols. */
59 #undef USER_LABEL_PREFIX
60 #define USER_LABEL_PREFIX ""
62 /* The prefix for immediate operands. */
64 #undef IMMEDIATE_PREFIX
65 #define IMMEDIATE_PREFIX "#"
67 /* In the machine description we can't use %R, because it will not be seen
68 by ASM_FPRINTF. (Isn't that a design bug?). */
70 #undef REGISTER_PREFIX_MD
71 #define REGISTER_PREFIX_MD "%%"
73 /* config/m68k.md has an explicit reference to the program counter,
74 prefix this by the register prefix. */
76 #define ASM_RETURN_CASE_JUMP \
79 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
81 return "jmp %%pc@(2,%0:w)"; \
84 /* How to refer to registers in assembler output.
85 This sequence is indexed by compiler's hard-register-number.
86 Motorola format uses different register names than defined
91 #define REGISTER_NAMES \
92 {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \
93 "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \
94 "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" }
96 /* This is how to output an assembler line that says to advance the
97 location counter to a multiple of 2**LOG bytes. */
99 #undef ASM_OUTPUT_ALIGN
100 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
103 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \
104 else if ((LOG) > 31) \
108 /* Use proper assembler syntax for these macros. */
109 #undef ASM_OUTPUT_REG_PUSH
110 #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \
111 asm_fprintf (FILE, "\t%Omove.l %s,-(%Rsp)\n", reg_names[REGNO])
113 #undef ASM_OUTPUT_REG_POP
114 #define ASM_OUTPUT_REG_POP(FILE,REGNO) \
115 asm_fprintf (FILE, "\t%Omove.l (%Rsp)+,%s\n", reg_names[REGNO])
117 /* Override the definition of NO_DOLLAR_IN_LABEL in svr4.h, for special
118 g++ assembler names. When this is defined, g++ uses embedded '.'
119 characters and some m68k assemblers have problems with this. The
120 chances are much greater that any particular assembler will permit
121 embedded '$' characters. */
123 #undef NO_DOLLAR_IN_LABEL
125 /* Define PCC_STATIC_STRUCT_RETURN if the convention on the target machine
126 is to use the nonreentrant technique for returning structure and union
127 values, as commonly implemented by the AT&T Portable C Compiler (PCC).
128 When defined, the gcc option -fpcc-struct-return can be used to cause
129 this form to be generated. When undefined, the option does nothing.
130 For m68k SVR4, the convention is to use a reentrant technique compatible
131 with the gcc default, so override the definition of this macro in m68k.h */
133 #undef PCC_STATIC_STRUCT_RETURN
135 /* Local common symbols are declared to the assembler with ".lcomm" rather
136 than ".bss", so override the definition in svr4.h */
139 #define BSS_ASM_OP "\t.lcomm\t"
141 /* Register in which address to store a structure value is passed to a
142 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
144 #undef STRUCT_VALUE_REGNUM
145 #define STRUCT_VALUE_REGNUM 8
147 #define ASM_COMMENT_START "|"
149 #undef TYPE_OPERAND_FMT
150 #define TYPE_OPERAND_FMT "@%s"
152 /* Define how the m68k registers should be numbered for Dwarf output.
153 The numbering provided here should be compatible with the native
154 SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
155 are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */
157 #undef DBX_REGISTER_NUMBER
158 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
160 /* The ASM_OUTPUT_SKIP macro is first defined in m68k.h, using ".skip".
161 It is then overridden by m68k/sgs.h to use ".space", and again by svr4.h
162 to use ".zero". The m68k/SVR4 assembler uses ".space", so repeat the
163 definition from m68k/sgs.h here. Note that ASM_NO_SKIP_IN_TEXT is
164 defined in m68k/sgs.h, so we don't have to repeat it here. */
166 #undef ASM_OUTPUT_SKIP
167 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
168 fprintf (FILE, "%s%u\n", SPACE_ASM_OP, (SIZE))
171 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
172 1 byte alignment. Don't generate alignment for COMMON seems to be
173 safer until we the assembler is fixed. */
174 #undef ASM_OUTPUT_ALIGNED_COMMON
175 /* Same problem with this one. */
176 #undef ASM_OUTPUT_ALIGNED_LOCAL
179 /* The `string' directive on m68k svr4 does not handle string with
180 escape char (ie., `\') right. Use normal way to output ASCII bytes
181 seems to be safer. */
182 #undef ASM_OUTPUT_ASCII
183 #define ASM_OUTPUT_ASCII(FILE,PTR,LEN) \
185 register int sp = 0, ch; \
186 fprintf ((FILE), "%s", BYTE_ASM_OP); \
189 if (ch > ' ' && ! (ch & 0x80) && ch != '\\') \
191 fprintf ((FILE), "'%c", ch); \
195 fprintf ((FILE), "0x%x", ch); \
199 if ((sp % 10) == 0) \
201 fprintf ((FILE), "\n%s", BYTE_ASM_OP); \
205 putc (',', (FILE)); \
208 } while (sp < (LEN)); \
209 putc ('\n', (FILE)); \
212 /* SVR4 m68k assembler is bitching on the syntax `2.b'.
213 So use the "LLDnnn-LLnnn" format. Define LLDnnn after the table. */
215 #undef ASM_OUTPUT_CASE_END
216 #define ASM_OUTPUT_CASE_END(FILE,NUM,TABLE) \
218 if (switch_table_difference_label_flag) \
219 asm_fprintf ((FILE), "%s%LLD%d,%LL%d\n", SET_ASM_OP, (NUM), (NUM)); \
220 switch_table_difference_label_flag = 0; \
223 extern int switch_table_difference_label_flag;
225 #undef ASM_OUTPUT_COMMON
226 #undef ASM_OUTPUT_LOCAL
227 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
228 ( fputs (".comm ", (FILE)), \
229 assemble_name ((FILE), (NAME)), \
230 fprintf ((FILE), ",%u\n", (SIZE)))
232 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
233 ( fputs (".lcomm ", (FILE)), \
234 assemble_name ((FILE), (NAME)), \
235 fprintf ((FILE), ",%u\n", (SIZE)))
237 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
238 keep switch tables in the text section. */
240 #define JUMP_TABLES_IN_TEXT_SECTION 1
242 /* Override the definition in svr4.h. In m68k svr4, using swbeg is the
243 standard way to do switch table. */
244 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
245 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
246 fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1));
248 /* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is an
249 operand of a function call. */
250 #undef LEGITIMATE_PIC_OPERAND_P
252 #define LEGITIMATE_PIC_OPERAND_P(X) \
253 (! symbolic_operand (X, VOIDmode) \
254 || (GET_CODE (X) == SYMBOL_REF && SYMBOL_REF_FLAG (X)) \
255 || PCREL_GENERAL_OPERAND_OK)
257 /* Turn off function cse if we are doing PIC. We always want function call
258 to be done as `bsr foo@PLTPC', so it will force the assembler to create
259 the PLT entry for `foo'. Doing function cse will cause the address of `foo'
260 to be loaded into a register, which is exactly what we want to avoid when
261 we are doing PIC on svr4 m68k. */
262 #undef OVERRIDE_OPTIONS
263 #define OVERRIDE_OPTIONS \
265 if (flag_pic) flag_no_function_cse = 1; \
266 if (! TARGET_68020 && flag_pic == 2) \
267 error("-fPIC is not currently supported on the 68000 or 68010\n"); \
268 if (TARGET_PCREL && flag_pic == 0) \
271 /* end of stuff from m68kv4.h */
276 #define ENDFILE_SPEC "crtend.o%s"
278 #undef STARTFILE_SPEC
279 #define STARTFILE_SPEC "crtbegin.o%s"
281 /* If defined, a C expression whose value is a string containing the
282 assembler operation to identify the following data as
283 uninitialized global data. If not defined, and neither
284 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
285 uninitialized global data will be output in the data section if
286 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
288 #ifndef BSS_SECTION_ASM_OP
289 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
292 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
293 separate, explicit argument. If you define this macro, it is used
294 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
295 handling the required alignment of the variable. The alignment is
296 specified as the number of bits.
298 Try to use function `asm_output_aligned_bss' defined in file
299 `varasm.c' when defining this macro. */
300 #ifndef ASM_OUTPUT_ALIGNED_BSS
301 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
302 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)