vms.h revision 1.8 
1/* Definitions of target machine GNU compiler. IA64-VMS version.
2   Copyright (C) 2003-2017 Free Software Foundation, Inc.
3   Contributed by Douglas B Rupp (rupp@gnat.com).
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 3, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING3.  If not see
19<http://www.gnu.org/licenses/>.  */
20
21#define OBJECT_FORMAT_ELF
22
23#define SUBTARGET_OS_CPP_BUILTINS()		\
24    do {					\
25	builtin_define ("__IA64");		\
26	builtin_define ("__IEEE_FLOAT");	\
27    } while (0)
28
29/* Need .debug_line info generated from gcc and gas.  */
30#undef TARGET_DEFAULT
31#define TARGET_DEFAULT (MASK_DWARF2_ASM | MASK_GNU_AS)
32
33#undef MAX_OFILE_ALIGNMENT
34#define MAX_OFILE_ALIGNMENT 524288  /* 8 x 2^16 by DEC Ada Test CD40VRA */
35
36/* Widest floating-point type efficiently supported by hardware and OS.  */
37#undef WIDEST_HARDWARE_FP_SIZE
38#define WIDEST_HARDWARE_FP_SIZE 64
39
40/* The structure return address arrives as an "argument" on VMS.  */
41#undef PCC_STATIC_STRUCT_RETURN
42
43/* Turn on VMS specific Dwarf2 features.  */
44#define VMS_DEBUGGING_INFO 1
45
46#define ASM_OUTPUT_DWARF_VMS_DELTA(FILE,SIZE,LABEL1,LABEL2) \
47do {                                          \
48  fprintf (FILE, "\tdata4.ua\t@slotcount(");  \
49  assemble_name (FILE, LABEL1);               \
50  fprintf (FILE, "-");                        \
51  assemble_name (FILE, LABEL2);               \
52  fprintf (FILE, ")");                        \
53} while (0)
54
55#undef STARTFILE_SPEC
56#define STARTFILE_SPEC "%{!shared:crt0.o%s crtbegin.o%s} \
57 %{!static:%{shared:crtinitS.o%s crtbeginS.o%s}}"
58
59#undef ENDFILE_SPEC
60#define ENDFILE_SPEC "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}"
61
62#define LINK_GCC_C_SEQUENCE_SPEC "%G"
63
64#undef LINK_SPEC
65#define LINK_SPEC "%{g0} %{g*:-g} %{map} %{save-temps} %{shared} %{v}"
66
67#undef LIB_SPEC
68#define LIB_SPEC ""
69
70#undef ASM_SPEC
71#define ASM_SPEC \
72"%{mno-gnu-as:-N so -N vms_upcase -W DVLoc_off} %{mconstant-gp:-M const_gp} \
73 %{mauto-pic:-M no_plabel} %{source-listing:-ahdl=%b.lis}"
74
75#undef ASM_OUTPUT_EXTERNAL_LIBCALL
76#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)			\
77do {								\
78  (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0));	\
79  ASM_OUTPUT_TYPE_DIRECTIVE (FILE, XSTR (FUN, 0), "function");	\
80} while (0)
81
82/* Set the function to change the names of the division and modulus
83   functions.   */
84#undef TARGET_INIT_LIBFUNCS
85#define TARGET_INIT_LIBFUNCS ia64_vms_init_libfuncs
86
87#define CTOR_LIST_BEGIN asm (".global\tLIB$INITIALIZE#\n");                  \
88STATIC func_ptr __CTOR_LIST__[1]                                             \
89  __attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr)))) \
90  = { (func_ptr) (-1) };
91
92#undef INIT_SECTION_ASM_OP
93#define INIT_SECTION_ASM_OP ".section\tLIB$INITIALIZE#,\"a\",@progbits"
94
95#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
96  asm (SECTION_OP "\n\tdata4 @fptr(" #FUNC"#)\n");      \
97  FORCE_CODE_SECTION_ALIGN                            \
98  asm (TEXT_SECTION_ASM_OP);
99
100#undef FINI_SECTION_ASM_OP
101
102/* Maybe same as HPUX?  Needs to be checked.  */
103#define JMP_BUF_SIZE  (8 * 76)
104
105#undef SUBTARGET_OPTIMIZATION_OPTIONS
106#define SUBTARGET_OPTIMIZATION_OPTIONS			\
107  { OPT_LEVELS_ALL, OPT_fmerge_constants, NULL, 0 }
108
109/* Define this to be nonzero if static stack checking is supported.  */
110#define STACK_CHECK_STATIC_BUILTIN 1
111
112/* Minimum amount of stack required to recover from an anticipated stack
113   overflow detection.  The default value conveys an estimate of the amount
114   of stack required to propagate an exception.  */
115#define STACK_CHECK_PROTECT (24 * 1024)
116
117#undef ASM_OUTPUT_ALIGNED_DECL_COMMON
118#define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
119  ia64_vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN)
120
121#undef TARGET_VALID_POINTER_MODE
122#define TARGET_VALID_POINTER_MODE ia64_vms_valid_pointer_mode
123
124/* Define this macro if it is advisable to hold scalars in registers
125   in a wider mode than that declared by the program.  In such cases,
126   the value is constrained to be within the bounds of the declared
127   type, but kept valid in the wider mode.  The signedness of the
128   extension may differ from that of the type.
129
130   For ia64, we always store objects in a full register.  32-bit integers
131   are always sign-extended, but smaller objects retain their signedness.  */
132
133#undef PROMOTE_MODE
134#define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)			\
135  if (GET_MODE_CLASS (MODE) == MODE_INT				\
136      && GET_MODE_SIZE (MODE) < UNITS_PER_WORD)			\
137    {								\
138      if ((MODE) == SImode)					\
139	(UNSIGNEDP) = 0;					\
140      (MODE) = DImode;						\
141    }
142
143#undef TARGET_PROMOTE_FUNCTION_MODE
144#define TARGET_PROMOTE_FUNCTION_MODE default_promote_function_mode_always_promote
145
146/* Code is always in P0/P1 (lower 32 bit addresses) on VMS.  */
147#undef CASE_VECTOR_MODE
148#define CASE_VECTOR_MODE SImode
149
150/* IA64 VMS doesn't fully support COMDAT sections.  */
151
152#define SUPPORTS_ONE_ONLY 0
153
154/* Default values for _CRTL_VER and _VMS_VER.  */
155#define VMS_DEFAULT_CRTL_VER 80300000
156#define VMS_DEFAULT_VMS_VER 80300000
157