ptx4-i.h revision 50397
150476Speter/* Target definitions for GNU compiler for Intel 80386 running Dynix/ptx v4 232213Swosch Copyright (C) 1996 Free Software Foundation, Inc. 3117260Sache 4117260Sache Modified from sysv4.h 586801Sache Originally written by Ron Guilmette (rfg@netcom.com). 686810Sache Modified by Tim Wright (timw@sequent.com). 786810Sache 83077SacheThis file is part of GNU CC. 93077Sache 103081SacheGNU CC is free software; you can redistribute it and/or modify 113077Sacheit under the terms of the GNU General Public License as published by 12124716Sruthe Free Software Foundation; either version 2, or (at your option) 13124716Sruany later version. 143077Sache 1537463SbdeGNU CC is distributed in the hope that it will be useful, 1637463Sbdebut WITHOUT ANY WARRANTY; without even the implied warranty of 173077SacheMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 183077SacheGNU General Public License for more details. 193077Sache 203077SacheYou should have received a copy of the GNU General Public License 213077Sachealong with GNU CC; see the file COPYING. If not, write to 223077Sachethe Free Software Foundation, 59 Temple Place - Suite 330, 23126268SbdeBoston, MA 02111-1307, USA. */ 2437463Sbde 253077Sache#include "i386/i386.h" /* Base i386 target machine definitions */ 263077Sache#include "i386/att.h" /* Use the i386 AT&T assembler syntax */ 27#include "ptx4.h" /* Rest of definitions (non architecture dependent) */ 28 29#undef TARGET_VERSION 30#define TARGET_VERSION fprintf (stderr, " (i386 Sequent Dynix/ptx Version 4)"); 31 32/* The svr4 ABI for the i386 says that records and unions are returned 33 in memory. */ 34 35#undef RETURN_IN_MEMORY 36#define RETURN_IN_MEMORY(TYPE) \ 37 (TYPE_MODE (TYPE) == BLKmode) 38 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)" 44 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. */ 49 50#undef ASM_OUTPUT_FLOAT 51#define ASM_OUTPUT_FLOAT(FILE,VALUE) \ 52do { long 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); \ 56 else \ 57 fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value); \ 58 } while (0) 59 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. */ 64 65#undef ASM_OUTPUT_DOUBLE 66#define ASM_OUTPUT_DOUBLE(FILE,VALUE) \ 67do { long value[2]; \ 68 REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), value); \ 69 if (sizeof (int) == sizeof (long)) \ 70 { \ 71 fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[0]); \ 72 fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[1]); \ 73 } \ 74 else \ 75 { \ 76 fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[0]); \ 77 fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[1]); \ 78 } \ 79 } while (0) 80 81 82#undef ASM_OUTPUT_LONG_DOUBLE 83#define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE) \ 84do { long value[3]; \ 85 REAL_VALUE_TO_TARGET_LONG_DOUBLE ((VALUE), value); \ 86 if (sizeof (int) == sizeof (long)) \ 87 { \ 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]); \ 91 } \ 92 else \ 93 { \ 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]); \ 97 } \ 98 } while (0) 99 100/* Output at beginning of assembler file. */ 101/* The .file command should always begin the output. */ 102 103#undef ASM_FILE_START 104#define ASM_FILE_START(FILE) \ 105 do { \ 106 output_file_directive (FILE, main_input_filename); \ 107 fprintf (FILE, "\t.version\t\"01.01\"\n"); \ 108 } while (0) 109 110/* 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: 113 114 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) 122 123 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. 126 127 8 for %eip (no gnu equivalent) 128 9 for %eflags (no gnu equivalent) 129 10 for %trapno (no gnu equivalent) 130 131 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. 138 139 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). 148 149 (Also note that the labels SDB prints for various FP stack regs 150 when doing an `x' command are all wrong.) 151 152 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. 158 159 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 162 numbers. 163 164 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) 172*/ 173 174#undef DBX_REGISTER_NUMBER 175#define DBX_REGISTER_NUMBER(n) \ 176((n) == 0 ? 0 \ 177 : (n) == 1 ? 2 \ 178 : (n) == 2 ? 1 \ 179 : (n) == 3 ? 3 \ 180 : (n) == 4 ? 6 \ 181 : (n) == 5 ? 7 \ 182 : (n) == 6 ? 5 \ 183 : (n) == 7 ? 4 \ 184 : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \ 185 : (-1)) 186 187/* 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. */ 193 194#undef ASM_OUTPUT_ASCII 195#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \ 196 do \ 197 { \ 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++) \ 202 { \ 203 register unsigned char *p; \ 204 if (bytes_in_chunk >= 64) \ 205 { \ 206 fputc ('\n', (FILE)); \ 207 bytes_in_chunk = 0; \ 208 } \ 209 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \ 210 continue; \ 211 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \ 212 { \ 213 if (bytes_in_chunk > 0) \ 214 { \ 215 fputc ('\n', (FILE)); \ 216 bytes_in_chunk = 0; \ 217 } \ 218 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \ 219 _ascii_bytes = p; \ 220 } \ 221 else \ 222 { \ 223 if (bytes_in_chunk == 0) \ 224 fprintf ((FILE), "\t.byte\t"); \ 225 else \ 226 fputc (',', (FILE)); \ 227 fprintf ((FILE), "0x%02x", *_ascii_bytes); \ 228 bytes_in_chunk += 5; \ 229 } \ 230 } \ 231 if (bytes_in_chunk > 0) \ 232 fprintf ((FILE), "\n"); \ 233 } \ 234 while (0) 235 236/* 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. */ 239 240#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) 243 244/* Indicate that jump tables go in the text section. This is 245 necessary when compiling PIC code. */ 246 247#define JUMP_TABLES_IN_TEXT_SECTION 1 248