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 ("_LONGLONG"); \
42 builtin_define ("__PRAGMA_EXTERN_PREFIX"); \
43 builtin_assert ("system=unix"); \
44 builtin_assert ("system=xpg4"); \
45 /* Tru64 UNIX V5 has a 16 byte long \
46 double type and requires __X_FLOAT \
47 to be defined for <math.h>. */ \
48 if (LONG_DOUBLE_TYPE_SIZE == 128) \
49 builtin_define ("__X_FLOAT"); \
52 /* Accept DEC C flags for multithreaded programs. We use _PTHREAD_USE_D4
53 instead of PTHREAD_USE_D4 since both have the same effect and the former
54 doesn't invade the users' namespace. */
56 #undef CPP_SUBTARGET_SPEC
57 #define CPP_SUBTARGET_SPEC \
58 "%{pthread|threads:-D_REENTRANT} %{threads:-D_PTHREAD_USE_D4}"
60 /* Under OSF4, -p and -pg require -lprof1, and -lprof1 requires -lpdf. */
63 "%{p|pg:-lprof1%{pthread|threads:_r} -lpdf} %{a:-lprof2} \
64 %{threads: -lpthreads} %{pthread|threads: -lpthread -lmach -lexc} -lc"
66 /* Pass "-G 8" to ld because Alpha's CC does. Pass -O3 if we are
67 optimizing, -O1 if we are not. Pass -S to silence `weak symbol
68 multiply defined' warnings. Pass -shared, -non_shared or
69 -call_shared as appropriate. Pass -hidden_symbol so that our
70 constructor and call-frame data structures are not accidentally
73 "-G 8 %{O*:-O3} %{!O*:-O1} -S %{static:-non_shared} \
74 %{!static:%{shared:-shared -hidden_symbol _GLOBAL_*} \
75 %{!shared:-call_shared}} %{pg} %{taso} %{rpath*}"
77 #define STARTFILE_SPEC \
78 "%{!shared:%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}"
80 #define ENDFILE_SPEC \
81 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
83 #define MD_STARTFILE_PREFIX "/usr/lib/cmplrs/cc/"
85 #define ASM_FILE_START(FILE) \
87 alpha_write_verstamp (FILE); \
88 fprintf (FILE, "\t.set noreorder\n"); \
89 fprintf (FILE, "\t.set volatile\n"); \
90 fprintf (FILE, "\t.set noat\n"); \
91 if (TARGET_SUPPORT_ARCH) \
92 fprintf (FILE, "\t.arch %s\n", \
93 TARGET_CPU_EV6 ? "ev6" \
95 ? (TARGET_MAX ? "pca56" : TARGET_BWX ? "ev56" : "ev5") \
98 ASM_OUTPUT_SOURCE_FILENAME (FILE, main_input_filename); \
101 /* Tru64 UNIX V5.1 requires a special as flag. Empty by default. */
103 #define ASM_OLDAS_SPEC ""
105 /* In OSF/1 v3.2c, the assembler by default does not output file names which
106 causes mips-tfile to fail. Passing -g to the assembler fixes this problem.
107 ??? Strictly speaking, we need -g only if the user specifies -g. Passing
108 it always means that we get slightly larger than necessary object files
109 if the user does not specify -g. If we don't pass -g, then mips-tfile
110 will need to be fixed to work in this case. Pass -O0 since some
111 optimization are broken and don't help us anyway. Pass -nocpp because
112 there's no point in running CPP on our assembler output. */
113 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GAS) != 0
114 #define ASM_SPEC "%{malpha-as:-g %(asm_oldas) -nocpp %{pg} -O0}"
116 #define ASM_SPEC "%{!mgas:-g %(asm_oldas) -nocpp %{pg} -O0}"
119 /* Specify to run a post-processor, mips-tfile after the assembler
120 has run to stuff the ecoff debug information into the object file.
121 This is needed because the Alpha assembler provides no way
122 of specifying such information in the assembly file. */
124 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GAS) != 0
126 #define ASM_FINAL_SPEC "\
127 %{malpha-as: %{!mno-mips-tfile: \
128 \n mips-tfile %{v*: -v} \
130 %{!K: %{save-temps: -I %b.o~}} \
131 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
132 %{.s:%i} %{!.s:%g.s}}}"
135 #define ASM_FINAL_SPEC "\
136 %{!mgas: %{!mno-mips-tfile: \
137 \n mips-tfile %{v*: -v} \
139 %{!K: %{save-temps: -I %b.o~}} \
140 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
141 %{.s:%i} %{!.s:%g.s}}}"
145 #undef SUBTARGET_EXTRA_SPECS
146 #define SUBTARGET_EXTRA_SPECS { "asm_oldas", ASM_OLDAS_SPEC }
148 /* Indicate that we have a stamp.h to use. */
149 #ifndef CROSS_COMPILE
150 #define HAVE_STAMP_H 1
153 /* Attempt to turn on access permissions for the stack. */
155 #define TRANSFER_FROM_TRAMPOLINE \
156 extern void __enable_execute_stack PARAMS ((void *)); \
159 __enable_execute_stack (addr) \
162 extern int mprotect PARAMS ((const void *, size_t, int)); \
163 long size = getpagesize (); \
164 long mask = ~(size-1); \
165 char *page = (char *) (((long) addr) & mask); \
166 char *end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
168 /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */ \
169 if (mprotect (page, end - page, 7) < 0) \
170 perror ("mprotect of trampoline code"); \
173 /* Digital UNIX V4.0E (1091)/usr/include/sys/types.h 4.3.49.9 1997/08/14 */
174 #define SIZE_TYPE "long unsigned int"
175 #define PTRDIFF_TYPE "long int"
177 /* The linker will stick __main into the .init section. */
178 #define HAS_INIT_SECTION
179 #define LD_INIT_SWITCH "-init"
180 #define LD_FINI_SWITCH "-fini"
182 /* Select a format to encode pointers in exception handling data. CODE
183 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
184 true if the symbol may be affected by dynamic relocations.
186 We really ought to be using the SREL32 relocations that ECOFF has,
187 but no version of the native assembler supports creating such things,
188 and Compaq has no plans to rectify this. Worse, the dynamic loader
189 cannot handle unaligned relocations, so we have to make sure that
190 things get padded appropriately. */
191 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
193 ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4) \
196 /* This is how we tell the assembler that a symbol is weak. */
198 #define ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, VALUE) \
201 (*targetm.asm_out.globalize_label) (FILE, NAME); \
202 fputs ("\t.weakext\t", FILE); \
203 assemble_name (FILE, NAME); \
207 assemble_name (FILE, VALUE); \
209 fputc ('\n', FILE); \
213 #define ASM_WEAKEN_LABEL(FILE, NAME) ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, 0)
215 /* Handle #pragma weak and #pragma pack. */
216 #define HANDLE_SYSV_PRAGMA 1
218 /* Handle #pragma extern_prefix. Technically only needed for Tru64 5.x,
219 but easier to manipulate preprocessor bits from here. */
220 #define HANDLE_PRAGMA_EXTERN_PREFIX 1