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1.1 root 1: /* Target definitions for GNU compiler for Sparc running System V.4
2: Copyright (C) 1991, 1992 Free Software Foundation, Inc.
3:
4: Written by Ron Guilmette ([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: #include "sparc/sparc.h"
23:
24: /* Undefine some symbols which are defined in "sparc.h" but which are
25: appropriate only for SunOS 4.x, and not for svr4. */
26:
27: #undef DBX_DEBUGGING_INFO
28: #undef WORD_SWITCH_TAKES_ARG
29: #undef SELECT_SECTION
30: #undef ASM_DECLARE_FUNCTION_NAME
31: #undef TEXT_SECTION_ASM_OP
32: #undef DATA_SECTION_ASM_OP
33:
34: #include "svr4.h"
35:
36: /* Undefined some symbols which are defined in "svr4.h" but which are
37: appropriate only for typical svr4 systems, but not for the specific
38: case of svr4 running on a Sparc. */
39:
40: #undef CTORS_SECTION_ASM_OP
41: #undef DTORS_SECTION_ASM_OP
42: #undef INIT_SECTION_ASM_OP
43: #undef CONST_SECTION_ASM_OP
44: #undef TYPE_OPERAND_FMT
45: #undef PUSHSECTION_FORMAT
46: #undef STRING_ASM_OP
47: #undef COMMON_ASM_OP
48: #undef SKIP_ASM_OP
49: #undef SET_ASM_OP /* Has no equivalent. See ASM_OUTPUT_DEF below. */
50:
51: /* Provide a set of pre-definitions and pre-assertions appropriate for
52: the Sparc running svr4. __svr4__ is our extension. */
53:
54: #define CPP_PREDEFINES \
55: "-Dsparc -Dunix -D__svr4__ -Asystem(unix) -Acpu(sparc) -Amachine(sparc) \
56: -D__GCC_NEW_VARARGS__"
57:
58: /* The specialized code which needs to appear in the .init section prior
59: to the prologue code for `__do_global_ctors' (see crtstuff.c).
60:
61: On Sparcs running svr4, the /usr/ccs/lib/crti.o file (with gets linked
62: in prior to the crtbegin.o file) has a single `save' instruction in its
63: .init section. That `save' instruction tries to setup a stack frame for
64: the sake of any subsequent code in the .init section. Unfortunately,
65: the size it uses for the stack frame is only a guess, and is not really
66: adequate for our purposes. More importantly, we independently put our
67: own standard function prologue (for __do_global_ctors) into the .init
68: section and that function prologue includes its own `save' instruction!
69: Thus, unless we do something to correct the situation, we'll get *two*
70: stack frames allocated when crt0.o calls the code in the .init section,
71: and havoc will ensue. The following macro definition prevents such woes.
72: */
73:
74: #define INIT_SECTION_PREAMBLE asm ("restore")
75:
76: /* This is the string used to begin an assembly language comment for the
77: Sparc/svr4 assembler. */
78:
79: #define ASM_COMMENT_START "!"
80:
81: /* Define the names of various pseudo-op used by the Sparc/svr4 assembler.
82: Note that many of these are different from the typical pseudo-ops used
83: by most svr4 assemblers. That is probably due to a (misguided?) attempt
84: to keep the Sparc/svr4 assembler somewhat compatible with the Sparc/SunOS
85: assembler. */
86:
87: #define STRING_ASM_OP ".asciz"
88: #define COMMON_ASM_OP ".common"
89: #define SKIP_ASM_OP ".skip"
90: #define UNALIGNED_INT_ASM_OP ".uaword"
91: #define UNALIGNED_SHORT_ASM_OP ".uahalf"
92: #define PUSHSECTION_ASM_OP ".pushsection"
93: #define POPSECTION_ASM_OP ".popsection"
94:
95: /* This is the format used to print the second operand of a .type pseudo-op
96: for the Sparc/svr4 assembler. */
97:
98: #define TYPE_OPERAND_FMT "#%s"
99:
100: /* This is the format used to print a .pushsection pseudo-op (and its operand)
101: for the Sparc/svr4 assembler. */
102:
103: #define PUSHSECTION_FORMAT "\t%s\t\"%s\"\n"
104:
105: #undef ASM_OUTPUT_CASE_LABEL
106: #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
107: do { ASM_OUTPUT_ALIGN ((FILE), 2); \
108: ASM_OUTPUT_INTERNAL_LABEL ((FILE), PREFIX, NUM); \
109: } while (0)
110:
111: /* This is how to equate one symbol to another symbol. The syntax used is
112: `SYM1=SYM2'. Note that this is different from the way equates are done
113: with most svr4 assemblers, where the syntax is `.set SYM1,SYM2'. */
114:
115: #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
116: do { fprintf ((FILE), "\t"); \
117: assemble_name (FILE, LABEL1); \
118: fprintf (FILE, " = "); \
119: assemble_name (FILE, LABEL2); \
120: fprintf (FILE, "\n"); \
121: } while (0)
122:
123: /* Define how the Sparc registers should be numbered for Dwarf output.
124: The numbering provided here should be compatible with the native
125: svr4 SDB debugger in the Sparc/svr4 reference port. The numbering
126: is as follows:
127:
128: Assembly name gcc internal regno Dwarf regno
129: ----------------------------------------------------------
130: g0-g7 0-7 0-7
131: o0-o7 8-15 8-15
132: l0-l7 16-23 16-23
133: i0-i7 24-31 24-31
134: f0-f31 32-63 40-71
135: */
136:
137: #define DBX_REGISTER_NUMBER(REGNO) \
138: (((REGNO) < 32) ? (REGNO) \
139: : ((REGNO) < 63) ? ((REGNO) + 8) \
140: : (abort (), 0))
141:
142: /* A set of symbol definitions for assembly pseudo-ops which will
143: get us switched to various sections of interest. These are used
144: in all places where we simply want to switch to a section, and
145: *not* to push the previous section name onto the assembler's
146: section names stack (as we do often in dwarfout.c). */
147:
148: #define TEXT_SECTION_ASM_OP ".section\t\".text\""
149: #define DATA_SECTION_ASM_OP ".section\t\".data\""
150: #define BSS_SECTION_ASM_OP ".section\t\".bss\""
151: #define CONST_SECTION_ASM_OP ".section\t\".rodata\""
152: #define INIT_SECTION_ASM_OP ".section\t\".init\",#alloc"
153: #define CTORS_SECTION_ASM_OP ".section\t\".ctors\",#alloc"
154: #define DTORS_SECTION_ASM_OP ".section\t\".dtors\",#alloc"
155:
156: /* If the host and target formats match, output the floats as hex. */
157: #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
158: #if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN
159:
160: /* This is how to output assembly code to define a `float' constant.
161: We always have to use a .long pseudo-op to do this because the native
162: SVR4 ELF assembler is buggy and it generates incorrect values when we
163: try to use the .float pseudo-op instead. */
164:
165: #undef ASM_OUTPUT_FLOAT
166: #define ASM_OUTPUT_FLOAT(FILE,VALUE) \
167: do { long value; \
168: REAL_VALUE_TO_TARGET_SINGLE ((VALUE), value); \
169: fprintf((FILE), "\t.long\t0x%x\n", value); \
170: } while (0)
171:
172: /* This is how to output assembly code to define a `double' constant.
173: We always have to use a pair of .long pseudo-ops to do this because
174: the native SVR4 ELF assembler is buggy and it generates incorrect
175: values when we try to use the the .double pseudo-op instead. */
176:
177: #undef ASM_OUTPUT_DOUBLE
178: #define ASM_OUTPUT_DOUBLE(FILE,VALUE) \
179: do { long value[2]; \
180: REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), value); \
181: fprintf((FILE), "\t.long\t0x%x\n", value[0]); \
182: fprintf((FILE), "\t.long\t0x%x\n", value[1]); \
183: } while (0)
184:
185: #endif /* word order matches */
186: #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
187:
188: /* This is how to output an assembler line defining a `long double'
189: constant. */
190:
191: #undef ASM_OUTPUT_LONG_DOUBLE
192: #define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE) \
193: do { long value[4]; \
194: REAL_VALUE_TO_TARGET_LONG_DOUBLE ((VALUE), value); \
195: fprintf((FILE), "\t.long\t0x%x\n", value[0]); \
196: fprintf((FILE), "\t.long\t0x%x\n", value[1]); \
197: fprintf((FILE), "\t.long\t0x%x\n", value[2]); \
198: fprintf((FILE), "\t.long\t0x%x\n", value[3]); \
199: } while (0)
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