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