1 /* Definitions of target machine for GNU compiler. Vxworks PowerPC version. 2 Copyright (C) 1996-2018 Free Software Foundation, Inc. 3 Contributed by CodeSourcery, LLC. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 3, or (at your option) any later 10 version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 for more details. 16 17 You should have received a copy of the GNU General Public License 18 along 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 /* Only big endian PPC is supported by VxWorks. */ 47 #undef BYTES_BIG_ENDIAN 48 #define BYTES_BIG_ENDIAN 1 49 #undef WORDS_BIG_ENDIAN 50 #define WORDS_BIG_ENDIAN 1 51 52 /* We have to kill off the entire specs set created by rs6000/sysv4.h 53 and substitute our own set. The top level vxworks.h has done some 54 of this for us. */ 55 56 #undef SUBTARGET_EXTRA_SPECS 57 #undef CPP_SPEC 58 #undef CC1_SPEC 59 #undef ASM_SPEC 60 61 #define SUBTARGET_EXTRA_SPECS /* none needed */ 62 63 /* FIXME: The only reason we allow no -mcpu switch at all is because 64 config-ml.in insists on a "." multilib. */ 65 #define CPP_SPEC \ 66 "%{!DCPU=*: \ 67 %{mcpu=403 : -DCPU=PPC403 ; \ 68 mcpu=405 : -DCPU=PPC405 ; \ 69 mcpu=440 : -DCPU=PPC440 ; \ 70 mcpu=464 : -DCPU=PPC464 ; \ 71 mcpu=476 : -DCPU=PPC476 ; \ 72 mcpu=603 : -DCPU=PPC603 ; \ 73 mcpu=604 : -DCPU=PPC604 ; \ 74 mcpu=860 : -DCPU=PPC860 ; \ 75 mcpu=8540: -DCPU=PPC85XX ; \ 76 mcpu=8548: -DCPU=PPC85XX ; \ 77 : -DCPU=PPC604 }}" \ 78 VXWORKS_ADDITIONAL_CPP_SPEC 79 80 #define CC1_SPEC \ 81 "%{G*} %{mno-sdata:-msdata=none} %{msdata:-msdata=default} \ 82 %{mlittle|mlittle-endian:-mstrict-align}" 83 84 #define ASM_SPEC \ 85 "%(asm_cpu) \ 86 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \ 87 %{mrelocatable} %{mrelocatable-lib} %{" FPIC_SPEC ":-K PIC} -mbig" 88 89 #undef LIB_SPEC 90 #define LIB_SPEC VXWORKS_LIB_SPEC 91 #undef LINK_SPEC 92 #define LINK_SPEC VXWORKS_LINK_SPEC 93 #undef STARTFILE_SPEC 94 #define STARTFILE_SPEC VXWORKS_STARTFILE_SPEC 95 #undef ENDFILE_SPEC 96 #define ENDFILE_SPEC VXWORKS_ENDFILE_SPEC 97 98 /* There is no default multilib. */ 99 #undef MULTILIB_DEFAULTS 100 101 #undef TARGET_DEFAULT 102 #define TARGET_DEFAULT (MASK_EABI | MASK_STRICT_ALIGN) 103 104 #undef PROCESSOR_DEFAULT 105 #define PROCESSOR_DEFAULT PROCESSOR_PPC604 106 107 /* Nor sdata, for kernel mode. We use this in 108 SUBSUBTARGET_INITIALIZE_OPTIONS, after rs6000_rtp has been initialized. */ 109 #undef SDATA_DEFAULT_SIZE 110 #define SDATA_DEFAULT_SIZE (TARGET_VXWORKS_RTP ? 8 : 0) 111 112 /* Enforce 16-byte alignment for the stack pointer, to permit general 113 compliance with e.g. Altivec instructions requirements. Make sure 114 this isn't overruled by the EABI constraints. */ 115 116 #undef STACK_BOUNDARY 117 #define STACK_BOUNDARY (16*BITS_PER_UNIT) 118 119 #undef PREFERRED_STACK_BOUNDARY 120 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY 121 122 #undef ABI_STACK_BOUNDARY 123 124 #undef RS6000_STARTING_FRAME_OFFSET 125 #define RS6000_STARTING_FRAME_OFFSET \ 126 (cfun->calls_alloca \ 127 ? RS6000_ALIGN (crtl->outgoing_args_size + RS6000_SAVE_AREA, 16) \ 128 : (RS6000_ALIGN (crtl->outgoing_args_size, 16) + RS6000_SAVE_AREA)) 129 130 #undef STACK_DYNAMIC_OFFSET 131 #define STACK_DYNAMIC_OFFSET(FUNDECL) \ 132 RS6000_ALIGN (crtl->outgoing_args_size.to_constant () \ 133 + STACK_POINTER_OFFSET, 16) 134 135 #undef SUBSUBTARGET_OVERRIDE_OPTIONS 136 #define SUBSUBTARGET_OVERRIDE_OPTIONS \ 137 do { \ 138 if (!global_options_set.x_g_switch_value) \ 139 g_switch_value = SDATA_DEFAULT_SIZE; \ 140 VXWORKS_OVERRIDE_OPTIONS; \ 141 } while (0) 142 143 /* No _mcount profiling on VxWorks. */ 144 #undef FUNCTION_PROFILER 145 #define FUNCTION_PROFILER(FILE,LABELNO) VXWORKS_FUNCTION_PROFILER(FILE,LABELNO) 146 147 /* Define this to be nonzero if static stack checking is supported. */ 148 #define STACK_CHECK_STATIC_BUILTIN 1 149 150 /* This platform supports the probing method of stack checking (RTP mode). 151 8K is reserved in the stack to propagate exceptions in case of overflow. */ 152 #define STACK_CHECK_PROTECT 8192 153