1 /* Definitions of target machine for GNU compiler, for DEC Alpha on OSF/1.
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4 Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
6 This file is part of GNU CC.
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)
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.
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. */
23 /* As of OSF 4.0, as can subtract adjacent labels. */
25 #undef TARGET_AS_CAN_SUBTRACT_LABELS
26 #define TARGET_AS_CAN_SUBTRACT_LABELS 1
28 /* The GEM libraries for X_float are present, though not used by C. */
30 #undef TARGET_HAS_XFLOATING_LIBS
31 #define TARGET_HAS_XFLOATING_LIBS 1
33 /* Names to predefine in the preprocessor for this target machine. */
35 #define TARGET_OS_CPP_BUILTINS() \
37 builtin_define_std ("unix"); \
38 builtin_define_std ("SYSTYPE_BSD"); \
39 builtin_define ("_SYSTYPE_BSD"); \
40 builtin_define ("__osf__"); \
41 builtin_define ("__digital__"); \
42 builtin_define ("__arch64__"); \
43 builtin_define ("_LONGLONG"); \
44 builtin_define ("__PRAGMA_EXTERN_PREFIX"); \
45 builtin_assert ("system=unix"); \
46 builtin_assert ("system=xpg4"); \
47 /* Tru64 UNIX V5 has a 16 byte long \
48 double type and requires __X_FLOAT \
49 to be defined for <math.h>. */ \
50 if (LONG_DOUBLE_TYPE_SIZE == 128) \
51 builtin_define ("__X_FLOAT"); \
54 /* Accept DEC C flags for multithreaded programs. We use _PTHREAD_USE_D4
55 instead of PTHREAD_USE_D4 since both have the same effect and the former
56 doesn't invade the users' namespace. */
58 #undef CPP_SUBTARGET_SPEC
59 #define CPP_SUBTARGET_SPEC \
60 "%{pthread|threads:-D_REENTRANT} %{threads:-D_PTHREAD_USE_D4}"
62 /* Under OSF4, -p and -pg require -lprof1, and -lprof1 requires -lpdf. */
65 "%{p|pg:-lprof1%{pthread|threads:_r} -lpdf} %{a:-lprof2} \
66 %{threads: -lpthreads} %{pthread|threads: -lpthread -lmach -lexc} -lc"
68 /* Pass "-G 8" to ld because Alpha's CC does. Pass -O3 if we are
69 optimizing, -O1 if we are not. Pass -S to silence `weak symbol
70 multiply defined' warnings. Pass -shared, -non_shared or
71 -call_shared as appropriate. Pass -hidden_symbol so that our
72 constructor and call-frame data structures are not accidentally
75 "-G 8 %{O*:-O3} %{!O*:-O1} -S %{static:-non_shared} \
76 %{!static:%{shared:-shared -hidden_symbol _GLOBAL_*} \
77 %{!shared:-call_shared}} %{pg} %{taso} %{rpath*}"
79 #define STARTFILE_SPEC \
80 "%{!shared:%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}"
82 #define ENDFILE_SPEC \
83 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
85 #define MD_STARTFILE_PREFIX "/usr/lib/cmplrs/cc/"
87 /* Tru64 UNIX V5.1 requires a special as flag. Empty by default. */
89 #define ASM_OLDAS_SPEC ""
91 /* In OSF/1 v3.2c, the assembler by default does not output file names which
92 causes mips-tfile to fail. Passing -g to the assembler fixes this problem.
93 ??? Strictly speaking, we need -g only if the user specifies -g. Passing
94 it always means that we get slightly larger than necessary object files
95 if the user does not specify -g. If we don't pass -g, then mips-tfile
96 will need to be fixed to work in this case. Pass -O0 since some
97 optimization are broken and don't help us anyway. Pass -nocpp because
98 there's no point in running CPP on our assembler output. */
99 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GAS) != 0
100 #define ASM_SPEC "%{malpha-as:-g %(asm_oldas) -nocpp %{pg} -O0}"
102 #define ASM_SPEC "%{!mgas:-g %(asm_oldas) -nocpp %{pg} -O0}"
105 /* Specify to run a post-processor, mips-tfile after the assembler
106 has run to stuff the ecoff debug information into the object file.
107 This is needed because the Alpha assembler provides no way
108 of specifying such information in the assembly file. */
110 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GAS) != 0
112 #define ASM_FINAL_SPEC "\
113 %{malpha-as: %{!mno-mips-tfile: \
114 \n mips-tfile %{v*: -v} \
116 %{!K: %{save-temps: -I %b.o~}} \
117 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
118 %{.s:%i} %{!.s:%g.s}}}"
121 #define ASM_FINAL_SPEC "\
122 %{!mgas: %{!mno-mips-tfile: \
123 \n mips-tfile %{v*: -v} \
125 %{!K: %{save-temps: -I %b.o~}} \
126 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
127 %{.s:%i} %{!.s:%g.s}}}"
131 #undef SUBTARGET_EXTRA_SPECS
132 #define SUBTARGET_EXTRA_SPECS { "asm_oldas", ASM_OLDAS_SPEC }
134 /* Indicate that we have a stamp.h to use. */
135 #ifndef CROSS_COMPILE
136 #define HAVE_STAMP_H 1
139 /* Attempt to turn on access permissions for the stack. */
141 #define TRANSFER_FROM_TRAMPOLINE \
143 __enable_execute_stack (void *addr) \
145 extern int mprotect (const void *, size_t, int); \
146 long size = getpagesize (); \
147 long mask = ~(size-1); \
148 char *page = (char *) (((long) addr) & mask); \
149 char *end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
151 /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */ \
152 if (mprotect (page, end - page, 7) < 0) \
153 perror ("mprotect of trampoline code"); \
156 /* Digital UNIX V4.0E (1091)/usr/include/sys/types.h 4.3.49.9 1997/08/14 */
157 #define SIZE_TYPE "long unsigned int"
158 #define PTRDIFF_TYPE "long int"
160 /* The linker will stick __main into the .init section. */
161 #define HAS_INIT_SECTION
162 #define LD_INIT_SWITCH "-init"
163 #define LD_FINI_SWITCH "-fini"
165 /* Select a format to encode pointers in exception handling data. CODE
166 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
167 true if the symbol may be affected by dynamic relocations.
169 We really ought to be using the SREL32 relocations that ECOFF has,
170 but no version of the native assembler supports creating such things,
171 and Compaq has no plans to rectify this. Worse, the dynamic loader
172 cannot handle unaligned relocations, so we have to make sure that
173 things get padded appropriately. */
174 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
176 ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4) \
179 /* This is how we tell the assembler that a symbol is weak. */
181 #define ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, VALUE) \
184 (*targetm.asm_out.globalize_label) (FILE, NAME); \
185 fputs ("\t.weakext\t", FILE); \
186 assemble_name (FILE, NAME); \
190 assemble_name (FILE, VALUE); \
192 fputc ('\n', FILE); \
196 #define ASM_WEAKEN_LABEL(FILE, NAME) ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, 0)
198 /* Handle #pragma weak and #pragma pack. */
199 #define HANDLE_SYSV_PRAGMA 1
201 /* Handle #pragma extern_prefix. Technically only needed for Tru64 5.x,
202 but easier to manipulate preprocessor bits from here. */
203 #define HANDLE_PRAGMA_EXTERN_PREFIX 1