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1.1 root 1: /* Target definitions for GNU compiler for mc680x0 running System V.4
2: Copyright (C) 1991 Free Software Foundation, Inc.
3:
4: Written by Ron Guilmette ([email protected]) and Fred Fish ([email protected]).
5:
6: This file is part of GNU CC.
7:
8: GNU CC is free software; you can redistribute it and/or modify
9: it under the terms of the GNU General Public License as published by
10: the Free Software Foundation; either version 2, or (at your option)
11: any later version.
12:
13: GNU CC is distributed in the hope that it will be useful,
14: but WITHOUT ANY WARRANTY; without even the implied warranty of
15: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: GNU General Public License for more details.
17:
18: You should have received a copy of the GNU General Public License
19: along with GNU CC; see the file COPYING. If not, write to
20: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21:
22: /* Use SGS_* macros to control compilation in m68k.md */
23:
24: #define SGS_SWITCH_TABLES /* Different switch table handling */
25:
26: #include "m68ksgs.h" /* The m68k/SVR4 assembler is SGS based */
27: #include "svr4.h" /* Pick up the generic SVR4 macros */
28:
29: /* See m68k.h. 7 means 68020 with 68881. */
30:
31: #ifndef TARGET_DEFAULT
32: #define TARGET_DEFAULT (5 /*68020*/ + 2 /*68881*/)
33: #endif
34:
35: /* Override the definition of NO_DOLLAR_IN_LABEL in svr4.h, for special
36: g++ assembler names. When this is defined, g++ uses embedded '.'
37: characters and some m68k assemblers have problems with this. The
38: chances are much greater that any particular assembler will permit
39: embedded '$' characters. */
40:
41: #undef NO_DOLLAR_IN_LABEL
42:
43: /* Define PCC_STATIC_STRUCT_RETURN if the convention on the target machine
44: is to use the nonreentrant technique for returning structure and union
45: values, as commonly implemented by the AT&T Portable C Compiler (PCC).
46: When defined, the gcc option -fpcc-struct-return can be used to cause
47: this form to be generated. When undefined, the option does nothing.
48: For m68k SVR4, the convention is to use a reentrant technique compatible
49: with the gcc default, so override the definition of this macro in m68k.h */
50:
51: #undef PCC_STATIC_STRUCT_RETURN
52:
53: /* Provide a set of pre-definitions and pre-assertions appropriate for
54: the m68k running svr4. __svr4__ is our extension. */
55:
56: #define CPP_PREDEFINES \
57: "-Dm68k -Dunix -D__svr4__ -Asystem(unix) -Acpu(m68k) -Amachine(m68k)"
58:
59: /* Test to see if the target includes a 68881 by default, and use CPP_SPEC
60: to control whether or not __HAVE_68881__ is defined by default or not.
61: If a 68881 is the default, gcc will use inline 68881 instructions, by
62: predefining __HAVE_68881__, unless -msoft-float is specified.
63: If a 68881 is not the default, gcc will only define __HAVE_68881__ if
64: -m68881 is specified. */
65:
66: #if TARGET_DEFAULT & 2
67: #define CPP_SPEC "%{!msoft-float:-D__HAVE_68881__}"
68: #else
69: #define CPP_SPEC "%{m68881:-D__HAVE_68881__}"
70: #endif
71:
72: /* Output assembler code to FILE to increment profiler label # LABELNO
73: for profiling a function entry. We override the definition in m68k.h
74: and match the way the native m68k/SVR4 compiler does profiling, with the
75: address of the profile counter in a1, not a0, and using bsr rather
76: than jsr. */
77:
78: #undef FUNCTION_PROFILER
79: #define FUNCTION_PROFILER(FILE, LABELNO) \
80: asm_fprintf ((FILE), "\tlea.l\t(%LLP%d,%Rpc),%Ra1\n\tbsr\t_mcount\n", \
81: (LABELNO))
82:
83: /* Local common symbols are declared to the assembler with ".lcomm" rather
84: than ".bss", so override the definition in svr4.h */
85:
86: #undef BSS_ASM_OP
1.1.1.2 root 87: #define BSS_ASM_OP ".lcomm"
1.1 root 88:
89: /* Register in which address to store a structure value is passed to a
90: function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
91:
92: #undef STRUCT_VALUE_REGNUM
93: #define STRUCT_VALUE_REGNUM 8
94:
95: #define ASM_COMMENT_START "#"
96:
97: #undef TYPE_OPERAND_FMT
98: #define TYPE_OPERAND_FMT "@%s"
99:
100: /* Define how the m68k registers should be numbered for Dwarf output.
101: The numbering provided here should be compatible with the native
102: SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
103: are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */
104:
105: #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
106:
107: /* The ASM_OUTPUT_SKIP macro is first defined in m68k.h, using ".skip".
108: It is then overridden by m68ksgs.h to use ".space", and again by svr4.h
109: to use ".zero". The m68k/SVR4 assembler uses ".space", so repeat the
110: definition from m68ksgs.h here. Note that ASM_NO_SKIP_IN_TEXT is
111: defined in m68ksgs.h, so we don't have to repeat it here. */
112:
113: #undef ASM_OUTPUT_SKIP
114: #define ASM_OUTPUT_SKIP(FILE,SIZE) \
1.1.1.2 root 115: fprintf (FILE, "\t%s %u\n", SPACE_ASM_OP, (SIZE))
1.1 root 116:
117: /* 1 if N is a possible register number for a function value.
118: For m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
119: pointer, or floating types, respectively. Reject fp0 if not using a
120: 68881 coprocessor. */
121:
122: #undef FUNCTION_VALUE_REGNO_P
123: #define FUNCTION_VALUE_REGNO_P(N) \
124: ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
125:
126: /* Define how to generate (in the callee) the output value of a function
127: and how to find (in the caller) the value returned by a function. VALTYPE
128: is the data type of the value (as a tree). If the precise function being
129: called is known, FUNC is its FUNCTION_DECL; otherwise, FUNC is 0.
130: For m68k/SVR4 generate the result in d0, a0, or fp0 as appropriate. */
131:
132: #undef FUNCTION_VALUE
133: #define FUNCTION_VALUE(VALTYPE, FUNC) \
134: (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881 \
135: ? gen_rtx (REG, TYPE_MODE (VALTYPE), 16) \
136: : (TREE_CODE (VALTYPE) == POINTER_TYPE \
137: ? gen_rtx (REG, TYPE_MODE (VALTYPE), 8) \
138: : gen_rtx (REG, TYPE_MODE (VALTYPE), 0)))
139:
140: /* For compatibility with the large body of existing code which does not
141: always properly declare external functions returning pointer types, the
142: m68k/SVR4 convention is to copy the value returned for pointer functions
143: from a0 to d0 in the function epilogue, so that callers that have
144: neglected to properly declare the callee can still find the correct return
145: value. */
146:
147: extern int current_function_returns_pointer;
148: #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \
149: do { \
150: if ((current_function_returns_pointer) && \
151: ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \
152: asm_fprintf (FILE, "\tmov.l %Ra0,%Rd0\n"); \
153: } while (0);
154:
155: /* Define how to find the value returned by a library function assuming the
156: value has mode MODE.
157: For m68k/SVR4 look for integer values in d0, pointer values in d0
158: (returned in both d0 and a0), and floating values in fp0. */
159:
160: #undef LIBCALL_VALUE
161: #define LIBCALL_VALUE(MODE) \
162: (((MODE) == SFmode || (MODE) == DFmode) && TARGET_68881 \
163: ? gen_rtx (REG, (MODE), 16) \
164: : gen_rtx (REG, (MODE), 0))
165:
166: /* Boundary (in *bits*) on which stack pointer should be aligned.
167: The m68k/SVR4 convention is to keep the stack pointer longword aligned. */
168:
169: #undef STACK_BOUNDARY
170: #define STACK_BOUNDARY 32
171:
172: /* Alignment of field after `int : 0' in a structure.
173: For m68k/SVR4, this is the next longword boundary. */
174:
175: #undef EMPTY_FIELD_BOUNDARY
176: #define EMPTY_FIELD_BOUNDARY 32
177:
178: /* No data type wants to be aligned rounder than this.
179: For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
180: boundaries */
181:
182: #undef BIGGEST_ALIGNMENT
183: #define BIGGEST_ALIGNMENT 64
1.1.1.3 ! root 184:
! 185: /* SVR4 m68k assembler is bitching on the `comm i,1,1' which askes for
! 186: 1 byte alignment. Don't generate alignment for COMMON seems to be
! 187: safer until we the assembler is fixed. */
! 188: #undef ASM_OUTPUT_ALIGNED_COMMON
! 189: /* Same problem with this one. */
! 190: #undef ASM_OUTPUT_ALIGNED_LOCAL
! 191:
! 192: /* The `string' directive on m68k svr4 does not handle string with
! 193: escape char (ie., `\') right. Use normal way to output ASCII bytes
! 194: seems to be safer. */
! 195: #undef ASM_OUTPUT_ASCII
! 196: #define ASM_OUTPUT_ASCII(FILE,PTR,LEN) \
! 197: { \
! 198: register int sp = 0, lp = 0, ch; \
! 199: fprintf ((FILE), "\t%s ", BYTE_ASM_OP); \
! 200: do { \
! 201: ch = (PTR)[sp]; \
! 202: if (ch > ' ' && ! (ch & 0x80) && ch != '\\') \
! 203: { \
! 204: fprintf ((FILE), "'%c", ch); \
! 205: } \
! 206: else \
! 207: { \
! 208: fprintf ((FILE), "0x%x", ch); \
! 209: } \
! 210: if (++sp < (LEN)) \
! 211: { \
! 212: if ((sp % 10) == 0) \
! 213: { \
! 214: fprintf ((FILE), "\n\t%s ", BYTE_ASM_OP); \
! 215: } \
! 216: else \
! 217: { \
! 218: putc (',', (FILE)); \
! 219: } \
! 220: } \
! 221: } while (sp < (LEN)); \
! 222: putc ('\n', (FILE)); \
! 223: }
! 224:
! 225: /* SVR4 m68k assembler is bitching on the syntax `2.b'.
! 226: So use the "LLDnnn-LLnnn" format. Define LLDnnn after the table. */
! 227:
! 228: #undef ASM_OUTPUT_CASE_END
! 229: #define ASM_OUTPUT_CASE_END(FILE,NUM,TABLE) \
! 230: do { \
! 231: if (switch_table_difference_label_flag) \
! 232: asm_fprintf ((FILE), "\t%s %LLD%d,%LL%d\n", SET_ASM_OP, (NUM), (NUM));\
! 233: switch_table_difference_label_flag = 0; \
! 234: } while (0)
! 235:
! 236: int switch_table_difference_label_flag;
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