1/* Definitions of target machine for GNU compiler.  Vxworks PowerPC version.
2   Copyright (C) 1996-2020 Free Software Foundation, Inc.
3   Contributed by CodeSourcery, LLC.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 3, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for 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/* Note to future editors: VxWorks is mostly an EABI target.  We do
22   not use rs6000/eabi.h because we would have to override most of
23   it anyway.  However, if you change that file, consider making
24   analogous changes here too.  */
25
26/* CPP predefined macros.  */
27
28#undef TARGET_OS_CPP_BUILTINS
29#define TARGET_OS_CPP_BUILTINS()		\
30  do						\
31    {						\
32      builtin_define ("__ppc");			\
33      builtin_define ("__PPC__");		\
34      builtin_define ("__EABI__");		\
35      builtin_define ("__ELF__");		\
36      if (!TARGET_SOFT_FLOAT)			\
37	builtin_define ("__hardfp");		\
38						\
39      /* C89 namespace violation! */		\
40      builtin_define ("CPU_FAMILY=PPC");	\
41        					\
42      VXWORKS_OS_CPP_BUILTINS ();		\
43    }		\
44  while (0)
45
46/* vx6 library path.  */
47#if !TARGET_VXWORKS7
48#undef  STARTFILE_PREFIX_SPEC
49#define STARTFILE_PREFIX_SPEC						\
50 "%{mrtp:%{!shared:%:getenv(WIND_BASE /target/lib/usr/lib/ppc/PPC32/common)}}"
51#endif
52
53/* Only big endian PPC is supported by VxWorks.  */
54#undef BYTES_BIG_ENDIAN
55#define BYTES_BIG_ENDIAN 1
56#undef WORDS_BIG_ENDIAN
57#define WORDS_BIG_ENDIAN 1
58
59/* We have to kill off the entire specs set created by rs6000/sysv4.h
60   and substitute our own set.  The top level vxworks.h has done some
61   of this for us.  */
62
63#undef SUBTARGET_EXTRA_SPECS
64#undef CPP_SPEC
65#undef CC1_SPEC
66#undef ASM_SPEC
67
68#define SUBTARGET_EXTRA_SPECS /* none needed */
69
70/* FIXME: The only reason we allow no -mcpu switch at all is because
71   config-ml.in insists on a "." multilib. */
72#define CPP_SPEC \
73"%{!DCPU=*:		  \
74   %{mcpu=403 : -DCPU=PPC403  ; \
75     mcpu=405 : -DCPU=PPC405  ; \
76     mcpu=440 : -DCPU=PPC440  ; \
77     mcpu=464 : -DCPU=PPC464  ; \
78     mcpu=476 : -DCPU=PPC476  ; \
79     mcpu=603 : -DCPU=PPC603  ; \
80     mcpu=604 : -DCPU=PPC604  ; \
81     mcpu=860 : -DCPU=PPC860  ; \
82     mcpu=8540: -DCPU=PPC85XX ; \
83     mcpu=8548: -DCPU=PPC85XX ; \
84              : -DCPU=PPC604  }}" \
85VXWORKS_ADDITIONAL_CPP_SPEC
86
87#define CC1_SPEC						\
88"%{G*} %{mno-sdata:-msdata=none} %{msdata:-msdata=default}	\
89 %{mlittle|mlittle-endian:-mstrict-align}"
90
91#define ASM_SPEC \
92"%(asm_cpu) \
93 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
94 %{mrelocatable} %{mrelocatable-lib} %{" FPIC_SPEC ":-K PIC} -mbig"
95
96#undef  LIB_SPEC
97#define LIB_SPEC VXWORKS_LIB_SPEC
98
99/* For RTPs, leverage linker relaxation.  This helps programs referring
100   to, typically, kernel services too far away for short calls.  This is more
101   precise than -mlongcall and can be overriden with -Wl,--no-relax.  */
102#define VXWORKS_RELAX_LINK_SPEC "%{mrtp:--relax}"
103
104#undef  LINK_SPEC
105#define LINK_SPEC VXWORKS_LINK_SPEC " " VXWORKS_RELAX_LINK_SPEC
106
107#undef  STARTFILE_SPEC
108#define STARTFILE_SPEC VXWORKS_STARTFILE_SPEC
109#undef  ENDFILE_SPEC
110#define ENDFILE_SPEC VXWORKS_ENDFILE_SPEC
111
112/* There is no default multilib.  */
113#undef MULTILIB_DEFAULTS
114
115#undef TARGET_DEFAULT
116#define TARGET_DEFAULT (MASK_EABI | MASK_STRICT_ALIGN)
117
118#undef PROCESSOR_DEFAULT
119#define PROCESSOR_DEFAULT PROCESSOR_PPC604
120
121/* Nor sdata, for kernel mode.  We use this in
122   SUBSUBTARGET_INITIALIZE_OPTIONS, after rs6000_rtp has been initialized.  */
123#undef SDATA_DEFAULT_SIZE
124#define SDATA_DEFAULT_SIZE (TARGET_VXWORKS_RTP ? 8 : 0)
125
126/* Enforce 16-byte alignment for the stack pointer, to permit general
127   compliance with e.g. Altivec instructions requirements.  Make sure
128   this isn't overruled by the EABI constraints.  */
129
130#undef  STACK_BOUNDARY
131#define STACK_BOUNDARY (16*BITS_PER_UNIT)
132
133#undef  PREFERRED_STACK_BOUNDARY
134#define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
135
136#undef  ABI_STACK_BOUNDARY
137
138#undef RS6000_STARTING_FRAME_OFFSET
139#define RS6000_STARTING_FRAME_OFFSET					\
140  (cfun->calls_alloca							\
141   ? RS6000_ALIGN (crtl->outgoing_args_size + RS6000_SAVE_AREA, 16)	\
142   : (RS6000_ALIGN (crtl->outgoing_args_size, 16) + RS6000_SAVE_AREA))
143
144#undef STACK_DYNAMIC_OFFSET
145#define STACK_DYNAMIC_OFFSET(FUNDECL)					\
146   RS6000_ALIGN (crtl->outgoing_args_size.to_constant ()		\
147		 + STACK_POINTER_OFFSET, 16)
148
149#undef SUBSUBTARGET_OVERRIDE_OPTIONS
150#define SUBSUBTARGET_OVERRIDE_OPTIONS		\
151  do {						\
152  if (!global_options_set.x_g_switch_value)	\
153    g_switch_value = SDATA_DEFAULT_SIZE;	\
154  VXWORKS_OVERRIDE_OPTIONS;			\
155  } while (0)
156
157/* No _mcount profiling on VxWorks.  */
158#undef FUNCTION_PROFILER
159#define FUNCTION_PROFILER(FILE,LABELNO) VXWORKS_FUNCTION_PROFILER(FILE,LABELNO)
160
161/* Define this to be nonzero if static stack checking is supported.  */
162#define STACK_CHECK_STATIC_BUILTIN 1
163
164/* This platform supports the probing method of stack checking (RTP mode).
165   8K is reserved in the stack to propagate exceptions in case of overflow.  */
166#define STACK_CHECK_PROTECT 8192
167