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1.1 root 1: /* Core target definitions for GNU compiler
2: for IBM RS/6000 PowerPC targeted to embedded ELF systems.
3: Copyright (C) 1995 Free Software Foundation, Inc.
4: Contributed by Cygnus Support.
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, 59 Temple Place - Suite 330,
21: Boston, MA 02111-1307, USA. */
22:
23: #include "rs6000/sysv4.h"
24:
25: /* For now, make stabs the default debugging type, not dwarf. */
26: #undef PREFERRED_DEBUGGING_TYPE
27: #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
28:
29: /* Make int foo : 8 not cause structures to be aligned to an int boundary */
30:
31: #undef PCC_BITFIELD_TYPE_MATTERS
32: #define PCC_BITFIELD_TYPE_MATTERS (TARGET_BITFIELD_TYPE)
33:
34: /* Define this macro to be the value 1 if instructions will fail to
35: work if given data not on the nominal alignment. If instructions
36: will merely go slower in that case, define this macro as 0.
37:
38: Note, little endian systems trap on unaligned addresses, so never
39: turn off strict alignment in that case. */
40: #undef STRICT_ALIGNMENT
41: #define STRICT_ALIGNMENT (TARGET_STRICT_ALIGN || TARGET_LITTLE_ENDIAN)
42:
43: /* Align stack to 8 byte boundaries, rather than 16 bytes Sys V.4 uses */
44: #undef STACK_BOUNDARY
45: #define STACK_BOUNDARY 64
46:
47: /* No data type wants to be aligned rounder than this. */
48: #undef BIGGEST_ALIGNMENT
49: #define BIGGEST_ALIGNMENT 64
50:
51: /* Put PC relative got entries in .got2 */
52: #undef MINIMAL_TOC_SECTION_ASM_OP
53: #define MINIMAL_TOC_SECTION_ASM_OP \
54: ((TARGET_RELOCATABLE) ? "\t.section\t\".got2\",\"aw\"" : "\t.section\t\".got1\",\"aw\"")
55:
56: /* Put relocatable data in .data, not .rodata so initialized pointers can be updated */
57: #undef CONST_SECTION_ASM_OP
58: #define CONST_SECTION_ASM_OP \
59: ((TARGET_RELOCATABLE) ? "\t.section\t\".data\"\t# .rodata" : "\t.section\t\".rodata\"")
60:
61: /* Invoke an initializer function to set up the GOT */
62: #define NAME__MAIN "__eabi"
63: #define INVOKE__main 1
64:
65: #undef TARGET_VERSION
66: #define TARGET_VERSION fprintf (stderr, " (PowerPC Embedded)");
67:
68: #undef CPP_PREDEFINES
69: #define CPP_PREDEFINES \
70: "-DPPC -D__embedded__ -Asystem(embedded) -Acpu(powerpc) -Amachine(powerpc)"
71:
72: /* Don't use startfiles or libraries except for libgcc.a */
73: #undef STARTFILE_SPEC
74: #define STARTFILE_SPEC ""
75:
76: #undef LIB_SPEC
77: #define LIB_SPEC ""
78:
79: #undef LIBGCC_SPEC
80: #define LIBGCC_SPEC "libgcc.a%s"
81:
82: #undef ENDFILE_SPEC
83: #define ENDFILE_SPEC ""
84:
85: /* This is how to output an assembler line defining an `int' constant.
86: For -mrelocatable, we mark all addresses that need to be fixed up
87: in the .fixup section. */
88: #undef ASM_OUTPUT_INT
89: #define ASM_OUTPUT_INT(FILE,VALUE) \
90: do { \
91: static int recurse = 0; \
92: if (TARGET_RELOCATABLE \
93: && in_section != in_toc \
94: && in_section != in_text \
95: && in_section != in_ctors \
96: && in_section != in_dtors \
97: && !recurse \
98: && GET_CODE (VALUE) != CONST_INT \
99: && GET_CODE (VALUE) != CONST_DOUBLE \
100: && CONSTANT_P (VALUE)) \
101: { \
102: static int labelno = 0; \
103: char buf[256], *p; \
104: \
105: recurse = 1; \
106: ASM_GENERATE_INTERNAL_LABEL (buf, "LCP", labelno++); \
107: STRIP_NAME_ENCODING (p, buf); \
108: fprintf (FILE, "%s:\n", p); \
109: fprintf (FILE, "\t.long ("); \
110: output_addr_const (FILE, (VALUE)); \
111: fprintf (FILE, ")@fixup\n"); \
112: fprintf (FILE, "\t.section\t\".fixup\",\"aw\"\n"); \
113: ASM_OUTPUT_ALIGN (FILE, 2); \
114: fprintf (FILE, "\t.long\t%s\n", p); \
115: fprintf (FILE, "\t.previous\n"); \
116: recurse = 0; \
117: } \
118: else \
119: { \
120: fprintf (FILE, "\t.long "); \
121: output_addr_const (FILE, (VALUE)); \
122: fprintf (FILE, "\n"); \
123: } \
124: } while (0)
125:
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