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
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 CPP_PREDEFINES "\
36 -Dunix -D__osf__ -D_LONGLONG -DSYSTYPE_BSD \
37 -D_SYSTYPE_BSD -Asystem=unix -Asystem=xpg4"
39 /* Tru64 UNIX V5 requires additional definitions for 16 byte long double
40 support. Empty by default. */
42 #define CPP_XFLOAT_SPEC ""
44 /* Accept DEC C flags for multithreaded programs. We use _PTHREAD_USE_D4
45 instead of PTHREAD_USE_D4 since both have the same effect and the former
46 doesn't invade the users' namespace. */
48 #undef CPP_SUBTARGET_SPEC
49 #define CPP_SUBTARGET_SPEC \
50 "%{pthread|threads:-D_REENTRANT} %{threads:-D_PTHREAD_USE_D4} %(cpp_xfloat)"
52 /* Under OSF4, -p and -pg require -lprof1, and -lprof1 requires -lpdf. */
55 "%{p|pg:-lprof1%{pthread|threads:_r} -lpdf} %{a:-lprof2} \
56 %{threads: -lpthreads} %{pthread|threads: -lpthread -lmach -lexc} -lc"
58 /* Pass "-G 8" to ld because Alpha's CC does. Pass -O3 if we are
59 optimizing, -O1 if we are not. Pass -shared, -non_shared or
60 -call_shared as appropriate. Pass -hidden_symbol so that our
61 constructor and call-frame data structures are not accidentally
64 "-G 8 %{O*:-O3} %{!O*:-O1} %{static:-non_shared} \
65 %{!static:%{shared:-shared -hidden_symbol _GLOBAL_*} \
66 %{!shared:-call_shared}} %{pg} %{taso} %{rpath*}"
68 #define STARTFILE_SPEC \
69 "%{!shared:%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}"
71 #define ENDFILE_SPEC \
72 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
74 #define MD_STARTFILE_PREFIX "/usr/lib/cmplrs/cc/"
76 #define ASM_FILE_START(FILE) \
78 alpha_write_verstamp (FILE); \
79 fprintf (FILE, "\t.set noreorder\n"); \
80 fprintf (FILE, "\t.set volatile\n"); \
81 fprintf (FILE, "\t.set noat\n"); \
82 if (TARGET_SUPPORT_ARCH) \
83 fprintf (FILE, "\t.arch %s\n", \
84 TARGET_CPU_EV6 ? "ev6" \
86 ? (TARGET_MAX ? "pca56" : TARGET_BWX ? "ev56" : "ev5") \
89 ASM_OUTPUT_SOURCE_FILENAME (FILE, main_input_filename); \
92 /* Tru64 UNIX V5.1 requires a special as flag. Empty by default. */
94 #define ASM_OLDAS_SPEC ""
96 /* No point in running CPP on our assembler output. */
97 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GAS) != 0
98 /* Don't pass -g to GNU as, because some versions don't accept this option. */
99 #define ASM_SPEC "%{malpha-as:-g %(asm_oldas)} -nocpp %{pg}"
101 /* In OSF/1 v3.2c, the assembler by default does not output file names which
102 causes mips-tfile to fail. Passing -g to the assembler fixes this problem.
103 ??? Strictly speaking, we need -g only if the user specifies -g. Passing
104 it always means that we get slightly larger than necessary object files
105 if the user does not specify -g. If we don't pass -g, then mips-tfile
106 will need to be fixed to work in this case. Pass -O0 since some
107 optimization are broken and don't help us anyway. */
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 \
139 { "cpp_xfloat", CPP_XFLOAT_SPEC }, \
140 { "asm_oldas", ASM_OLDAS_SPEC }
142 /* Indicate that we have a stamp.h to use. */
143 #ifndef CROSS_COMPILE
144 #define HAVE_STAMP_H 1
147 /* Attempt to turn on access permissions for the stack. */
149 #define TRANSFER_FROM_TRAMPOLINE \
150 extern void __enable_execute_stack PARAMS ((void *)); \
153 __enable_execute_stack (addr) \
156 extern int mprotect PARAMS ((const void *, size_t, int)); \
157 long size = getpagesize (); \
158 long mask = ~(size-1); \
159 char *page = (char *) (((long) addr) & mask); \
160 char *end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
162 /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */ \
163 if (mprotect (page, end - page, 7) < 0) \
164 perror ("mprotect of trampoline code"); \
167 /* Digital UNIX V4.0E (1091)/usr/include/sys/types.h 4.3.49.9 1997/08/14 */
168 #define SIZE_TYPE "long unsigned int"
169 #define PTRDIFF_TYPE "long int"
171 /* The linker will stick __main into the .init section. */
172 #define HAS_INIT_SECTION
173 #define LD_INIT_SWITCH "-init"
174 #define LD_FINI_SWITCH "-fini"
176 /* Select a format to encode pointers in exception handling data. CODE
177 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
178 true if the symbol may be affected by dynamic relocations.
180 We really ought to be using the SREL32 relocations that ECOFF has,
181 but no version of the native assembler supports creating such things,
182 and Compaq has no plans to rectify this. Worse, the dynamic loader
183 cannot handle unaligned relocations, so we have to make sure that
184 things get padded appropriately. */
185 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
187 ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4) \
190 /* This is how we tell the assembler that a symbol is weak. */
192 #define ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, VALUE) \
195 ASM_GLOBALIZE_LABEL (FILE, NAME); \
196 fputs ("\t.weakext\t", FILE); \
197 assemble_name (FILE, NAME); \
201 assemble_name (FILE, VALUE); \
203 fputc ('\n', FILE); \
207 #define ASM_WEAKEN_LABEL(FILE, NAME) ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, 0)
209 /* Handle #pragma weak and #pragma pack. */
210 #undef HANDLE_SYSV_PRAGMA
211 #define HANDLE_SYSV_PRAGMA 1