1 /* Target definitions for GNU compiler for Intel 80386 running Dynix/ptx v4
2 Copyright (C) 1996 Free Software Foundation, Inc.
5 Originally written by Ron Guilmette (rfg@netcom.com).
6 Modified by Tim Wright (timw@sequent.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 #include "i386/i386.h" /* Base i386 target machine definitions */
26 #include "i386/att.h" /* Use the i386 AT&T assembler syntax */
27 #include "ptx4.h" /* Rest of definitions (non architecture dependent) */
30 #define TARGET_VERSION fprintf (stderr, " (i386 Sequent Dynix/ptx Version 4)");
32 /* The svr4 ABI for the i386 says that records and unions are returned
35 #undef RETURN_IN_MEMORY
36 #define RETURN_IN_MEMORY(TYPE) \
37 (TYPE_MODE (TYPE) == BLKmode)
39 /* Define which macros to predefine. _SEQUENT_ is our extension. */
40 /* This used to define X86, but james@bigtex.cactus.org says that
41 is supposed to be defined optionally by user programs--not by default. */
42 #define CPP_PREDEFINES \
43 "-Di386 -Dunix -D_SEQUENT_ -Asystem(unix) -Asystem(ptx4) -Acpu(i386) -Amachine(i386)"
45 /* This is how to output assembly code to define a `float' constant.
46 We always have to use a .long pseudo-op to do this because the native
47 SVR4 ELF assembler is buggy and it generates incorrect values when we
48 try to use the .float pseudo-op instead. */
50 #undef ASM_OUTPUT_FLOAT
51 #define ASM_OUTPUT_FLOAT(FILE,VALUE) \
53 REAL_VALUE_TO_TARGET_SINGLE ((VALUE), value); \
54 if (sizeof (int) == sizeof (long)) \
55 fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value); \
57 fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value); \
60 /* This is how to output assembly code to define a `double' constant.
61 We always have to use a pair of .long pseudo-ops to do this because
62 the native SVR4 ELF assembler is buggy and it generates incorrect
63 values when we try to use the .double pseudo-op instead. */
65 #undef ASM_OUTPUT_DOUBLE
66 #define ASM_OUTPUT_DOUBLE(FILE,VALUE) \
68 REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), value); \
69 if (sizeof (int) == sizeof (long)) \
71 fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[0]); \
72 fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[1]); \
76 fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[0]); \
77 fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[1]); \
82 #undef ASM_OUTPUT_LONG_DOUBLE
83 #define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE) \
85 REAL_VALUE_TO_TARGET_LONG_DOUBLE ((VALUE), value); \
86 if (sizeof (int) == sizeof (long)) \
88 fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[0]); \
89 fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[1]); \
90 fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[2]); \
94 fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[0]); \
95 fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[1]); \
96 fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[2]); \
100 /* Output at beginning of assembler file. */
101 /* The .file command should always begin the output. */
103 #undef ASM_FILE_START
104 #define ASM_FILE_START(FILE) \
106 output_file_directive (FILE, main_input_filename); \
107 fprintf (FILE, "\t.version\t\"01.01\"\n"); \
110 /* Define the register numbers to be used in Dwarf debugging information.
111 The SVR4 reference port C compiler uses the following register numbers
112 in its Dwarf output code:
114 0 for %eax (gnu regno = 0)
115 1 for %ecx (gnu regno = 2)
116 2 for %edx (gnu regno = 1)
117 3 for %ebx (gnu regno = 3)
118 4 for %esp (gnu regno = 7)
119 5 for %ebp (gnu regno = 6)
120 6 for %esi (gnu regno = 4)
121 7 for %edi (gnu regno = 5)
123 The following three DWARF register numbers are never generated by
124 the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
125 believes these numbers have these meanings.
127 8 for %eip (no gnu equivalent)
128 9 for %eflags (no gnu equivalent)
129 10 for %trapno (no gnu equivalent)
131 It is not at all clear how we should number the FP stack registers
132 for the x86 architecture. If the version of SDB on x86/svr4 were
133 a bit less brain dead with respect to floating-point then we would
134 have a precedent to follow with respect to DWARF register numbers
135 for x86 FP registers, but the SDB on x86/svr4 is so completely
136 broken with respect to FP registers that it is hardly worth thinking
137 of it as something to strive for compatibility with.
139 The version of x86/svr4 SDB I have at the moment does (partially)
140 seem to believe that DWARF register number 11 is associated with
141 the x86 register %st(0), but that's about all. Higher DWARF
142 register numbers don't seem to be associated with anything in
143 particular, and even for DWARF regno 11, SDB only seems to under-
144 stand that it should say that a variable lives in %st(0) (when
145 asked via an `=' command) if we said it was in DWARF regno 11,
146 but SDB still prints garbage when asked for the value of the
147 variable in question (via a `/' command).
149 (Also note that the labels SDB prints for various FP stack regs
150 when doing an `x' command are all wrong.)
152 Note that these problems generally don't affect the native SVR4
153 C compiler because it doesn't allow the use of -O with -g and
154 because when it is *not* optimizing, it allocates a memory
155 location for each floating-point variable, and the memory
156 location is what gets described in the DWARF AT_location
157 attribute for the variable in question.
159 Regardless of the severe mental illness of the x86/svr4 SDB, we
160 do something sensible here and we use the following DWARF
161 register numbers. Note that these are all stack-top-relative
164 11 for %st(0) (gnu regno = 8)
165 12 for %st(1) (gnu regno = 9)
166 13 for %st(2) (gnu regno = 10)
167 14 for %st(3) (gnu regno = 11)
168 15 for %st(4) (gnu regno = 12)
169 16 for %st(5) (gnu regno = 13)
170 17 for %st(6) (gnu regno = 14)
171 18 for %st(7) (gnu regno = 15)
174 #undef DBX_REGISTER_NUMBER
175 #define DBX_REGISTER_NUMBER(n) \
184 : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
187 /* The routine used to output sequences of byte values. We use a special
188 version of this for most svr4 targets because doing so makes the
189 generated assembly code more compact (and thus faster to assemble)
190 as well as more readable. Note that if we find subparts of the
191 character sequence which end with NUL (and which are shorter than
192 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
194 #undef ASM_OUTPUT_ASCII
195 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
198 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
199 register unsigned char *limit = _ascii_bytes + (LENGTH); \
200 register unsigned bytes_in_chunk = 0; \
201 for (; _ascii_bytes < limit; _ascii_bytes++) \
203 register unsigned char *p; \
204 if (bytes_in_chunk >= 64) \
206 fputc ('\n', (FILE)); \
207 bytes_in_chunk = 0; \
209 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
211 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
213 if (bytes_in_chunk > 0) \
215 fputc ('\n', (FILE)); \
216 bytes_in_chunk = 0; \
218 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
223 if (bytes_in_chunk == 0) \
224 fprintf ((FILE), "\t.byte\t"); \
226 fputc (',', (FILE)); \
227 fprintf ((FILE), "0x%02x", *_ascii_bytes); \
228 bytes_in_chunk += 5; \
231 if (bytes_in_chunk > 0) \
232 fprintf ((FILE), "\n"); \
236 /* This is how to output an element of a case-vector that is relative.
237 This is only used for PIC code. See comments by the `casesi' insn in
238 i386.md for an explanation of the expression this outputs. */
240 #undef ASM_OUTPUT_ADDR_DIFF_ELT
241 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
242 fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
244 /* Indicate that jump tables go in the text section. This is
245 necessary when compiling PIC code. */
247 #define JUMP_TABLES_IN_TEXT_SECTION 1