1 /* m68kelf support, derived from m68kv4.h */
2
3 /* Target definitions for GNU compiler for mc680x0 running System V.4
4 Copyright (C) 1991-2023 Free Software Foundation, Inc.
5
6 Written by Ron Guilmette (rfg@netcom.com) and Fred Fish (fnf@cygnus.com).
7
8 This file is part of GCC.
9
10 GCC 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 3, or (at your option)
13 any later version.
14
15 GCC 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.
19
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING3. If not see
22 <http://www.gnu.org/licenses/>. */
23
24
25 #ifndef SWBEG_ASM_OP
26 #define SWBEG_ASM_OP "\t.swbeg\t"
27 #endif
28
29 /* Here are three prefixes that are used by asm_fprintf to
30 facilitate customization for alternate assembler syntaxes.
31 Machines with no likelihood of an alternate syntax need not
32 define these and need not use asm_fprintf. */
33
34 /* The prefix for register names. Note that REGISTER_NAMES
35 is supposed to include this prefix. Also note that this is NOT an
36 fprintf format string, it is a literal string */
37
38 #undef REGISTER_PREFIX
39 #define REGISTER_PREFIX "%"
40
41 /* The prefix for local (compiler generated) labels.
42 These labels will not appear in the symbol table. */
43
44 #undef LOCAL_LABEL_PREFIX
45 #define LOCAL_LABEL_PREFIX "."
46
47 /* The prefix to add to user-visible assembler symbols. */
48
49 #undef USER_LABEL_PREFIX
50 #define USER_LABEL_PREFIX ""
51
52 /* config/m68k.md has an explicit reference to the program counter,
53 prefix this by the register prefix. */
54
55 #define ASM_RETURN_CASE_JUMP \
56 do { \
57 if (TARGET_COLDFIRE) \
58 { \
59 if (ADDRESS_REG_P (operands[0])) \
60 return "jmp %%pc@(2,%0:l)"; \
61 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \
62 return "jmp %%pc@(2,%0:l)"; \
63 else \
64 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
65 } \
66 else if (TARGET_LONG_JUMP_TABLE_OFFSETS) \
67 return "jmp %%pc@(2,%0:l)"; \
68 else \
69 return "jmp %%pc@(2,%0:w)"; \
70 } while (0)
71
72 /* This is how to output an assembler line that says to advance the
73 location counter to a multiple of 2**LOG bytes. */
74
75 #undef ASM_OUTPUT_ALIGN
76 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
77 do { \
78 if ((LOG) > 0) \
79 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \
80 } while (0)
81
82 /* Register in which address to store a structure value is passed to a
83 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
84
85 #undef M68K_STRUCT_VALUE_REGNUM
86 #define M68K_STRUCT_VALUE_REGNUM A0_REG
87
88 /* The static chain regnum defaults to a0, but we use that for
89 structure return, so have to use a1 for the static chain. */
90
91 #undef STATIC_CHAIN_REGNUM
92 #define STATIC_CHAIN_REGNUM A1_REG
93 #undef M68K_STATIC_CHAIN_REG_NAME
94 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"
95
96 #define ASM_COMMENT_START "|"
97
98 /* Define how the m68k registers should be numbered for Dwarf output.
99 The numbering provided here should be compatible with the native
100 SVR4 debugger in the m68k/SVR4 reference port, where d0-d7
101 are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */
102
103 #undef DEBUGGER_REGNO
104 #define DEBUGGER_REGNO(REGNO) (REGNO)
105
106 #if 0
107 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
108 1 byte alignment. Don't generate alignment for COMMON seems to be
109 safer until we the assembler is fixed. */
110 #undef ASM_OUTPUT_ALIGNED_COMMON
111 /* Same problem with this one. */
112 #undef ASM_OUTPUT_ALIGNED_LOCAL
113 #endif
114
115 #undef ASM_OUTPUT_COMMON
116 #undef ASM_OUTPUT_LOCAL
117 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
118 ( fputs (".comm ", (FILE)), \
119 assemble_name ((FILE), (NAME)), \
120 fprintf ((FILE), ",%u\n", (int)(SIZE)))
121
122 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
123 ( fputs (".lcomm ", (FILE)), \
124 assemble_name ((FILE), (NAME)), \
125 fprintf ((FILE), ",%u\n", (int)(SIZE)))
126
127 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
128 keep switch tables in the text section. */
129
130 #define JUMP_TABLES_IN_TEXT_SECTION 1
131
132 /* In m68k svr4, using swbeg is the standard way to do switch
133 table. */
134 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
135 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
136 fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1))
137 /* end of stuff from m68kv4.h */
138
139 #undef ENDFILE_SPEC
140 #define ENDFILE_SPEC "crtend.o%s"
141
142 #undef STARTFILE_SPEC
143 #define STARTFILE_SPEC "crtbegin.o%s"
144
145 #ifndef BSS_SECTION_ASM_OP
146 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
147 #endif
148
149 #ifndef ASM_OUTPUT_ALIGNED_BSS
150 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
151 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
152 #endif