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 2004 Free Software Foundation, Inc.
4 Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
6 This file is part of GCC.
8 GCC 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 GCC 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 GCC; 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_assert ("system=unix"); \
45 builtin_assert ("system=xpg4"); \
46 /* Tru64 UNIX V5 has a 16 byte long \
47 double type and requires __X_FLOAT \
48 to be defined for <math.h>. */ \
49 if (LONG_DOUBLE_TYPE_SIZE == 128) \
50 builtin_define ("__X_FLOAT"); \
52 /* Tru64 UNIX V4/V5 provide several ISO C94 \
53 features protected by the corresponding \
54 __STDC_VERSION__ macro. libstdc++ v3 \
55 needs them as well. */ \
56 if (c_dialect_cxx ()) \
57 builtin_define ("__STDC_VERSION__=199409L"); \
60 /* Accept DEC C flags for multithreaded programs. We use _PTHREAD_USE_D4
61 instead of PTHREAD_USE_D4 since both have the same effect and the former
62 doesn't invade the users' namespace. */
64 #undef CPP_SUBTARGET_SPEC
65 #define CPP_SUBTARGET_SPEC \
66 "%{pthread|threads:-D_REENTRANT} %{threads:-D_PTHREAD_USE_D4}"
68 /* Under OSF4, -p and -pg require -lprof1, and -lprof1 requires -lpdf. */
71 "%{p|pg:-lprof1%{pthread|threads:_r} -lpdf} %{a:-lprof2} \
72 %{threads: -lpthreads} %{pthread|threads: -lpthread -lmach -lexc} -lc"
74 /* Pass "-G 8" to ld because Alpha's CC does. Pass -O3 if we are
75 optimizing, -O1 if we are not. Pass -S to silence `weak symbol
76 multiply defined' warnings. Pass -shared, -non_shared or
77 -call_shared as appropriate. Pass -hidden_symbol so that our
78 constructor and call-frame data structures are not accidentally
81 "-G 8 %{O*:-O3} %{!O*:-O1} -S %{static:-non_shared} \
82 %{!static:%{shared:-shared -hidden_symbol _GLOBAL_*} \
83 %{!shared:-call_shared}} %{pg} %{taso} %{rpath*}"
85 #define STARTFILE_SPEC \
86 "%{!shared:%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}"
88 #define ENDFILE_SPEC \
89 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
91 #define MD_STARTFILE_PREFIX "/usr/lib/cmplrs/cc/"
93 /* Tru64 UNIX V5.1 requires a special as flag. Empty by default. */
95 #define ASM_OLDAS_SPEC ""
97 /* In OSF/1 v3.2c, the assembler by default does not output file names which
98 causes mips-tfile to fail. Passing -g to the assembler fixes this problem.
99 ??? Strictly speaking, we need -g only if the user specifies -g. Passing
100 it always means that we get slightly larger than necessary object files
101 if the user does not specify -g. If we don't pass -g, then mips-tfile
102 will need to be fixed to work in this case. Pass -O0 since some
103 optimization are broken and don't help us anyway. Pass -nocpp because
104 there's no point in running CPP on our assembler output. */
105 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GAS) != 0
106 #define ASM_SPEC "%{malpha-as:-g %(asm_oldas) -nocpp %{pg} -O0}"
108 #define ASM_SPEC "%{!mgas:-g %(asm_oldas) -nocpp %{pg} -O0}"
111 /* Specify to run a post-processor, mips-tfile after the assembler
112 has run to stuff the ecoff debug information into the object file.
113 This is needed because the Alpha assembler provides no way
114 of specifying such information in the assembly file. */
116 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GAS) != 0
118 #define ASM_FINAL_SPEC "\
119 %{malpha-as: %{!mno-mips-tfile: \
120 \n mips-tfile %{v*: -v} \
122 %{!K: %{save-temps: -I %b.o~}} \
123 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
124 %{.s:%i} %{!.s:%g.s}}}"
127 #define ASM_FINAL_SPEC "\
128 %{!mgas: %{!mno-mips-tfile: \
129 \n mips-tfile %{v*: -v} \
131 %{!K: %{save-temps: -I %b.o~}} \
132 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
133 %{.s:%i} %{!.s:%g.s}}}"
137 #undef SUBTARGET_EXTRA_SPECS
138 #define SUBTARGET_EXTRA_SPECS { "asm_oldas", ASM_OLDAS_SPEC }
140 /* Indicate that we have a stamp.h to use. */
141 #ifndef CROSS_COMPILE
142 #define HAVE_STAMP_H 1
145 /* Attempt to turn on access permissions for the stack. */
147 #define TRANSFER_FROM_TRAMPOLINE \
149 __enable_execute_stack (void *addr) \
151 extern int mprotect (const void *, size_t, int); \
152 long size = getpagesize (); \
153 long mask = ~(size-1); \
154 char *page = (char *) (((long) addr) & mask); \
155 char *end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
157 /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */ \
158 if (mprotect (page, end - page, 7) < 0) \
159 perror ("mprotect of trampoline code"); \
162 /* Digital UNIX V4.0E (1091)/usr/include/sys/types.h 4.3.49.9 1997/08/14 */
163 #define SIZE_TYPE "long unsigned int"
164 #define PTRDIFF_TYPE "long int"
166 /* The linker will stick __main into the .init section. */
167 #define HAS_INIT_SECTION
168 #define LD_INIT_SWITCH "-init"
169 #define LD_FINI_SWITCH "-fini"
171 /* The linker needs a space after "-o". This allows -oldstyle_liblookup to
173 #define SWITCHES_NEED_SPACES "o"
175 /* Select a format to encode pointers in exception handling data. CODE
176 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
177 true if the symbol may be affected by dynamic relocations.
179 We really ought to be using the SREL32 relocations that ECOFF has,
180 but no version of the native assembler supports creating such things,
181 and Compaq has no plans to rectify this. Worse, the dynamic loader
182 cannot handle unaligned relocations, so we have to make sure that
183 things get padded appropriately. */
184 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
186 ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4) \
189 /* This is how we tell the assembler that a symbol is weak. */
191 #define ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, VALUE) \
194 (*targetm.asm_out.globalize_label) (FILE, NAME); \
195 fputs ("\t.weakext\t", FILE); \
196 assemble_name (FILE, NAME); \
200 assemble_name (FILE, VALUE); \
202 fputc ('\n', FILE); \
206 #define ASM_WEAKEN_LABEL(FILE, NAME) ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, 0)
208 /* Handle #pragma weak and #pragma pack. */
209 #define HANDLE_SYSV_PRAGMA 1
211 /* Handle #pragma extern_prefix. Technically only needed for Tru64 5.x,
212 but easier to manipulate preprocessor bits from here. */
213 #define TARGET_HANDLE_PRAGMA_EXTERN_PREFIX 1