1 /* Configuration file for ARM BPABI targets. 2 Copyright (C) 2004-2020 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 8 under the terms of the GNU General Public License as published 9 by the Free Software Foundation; either version 3, or (at your 10 option) any later version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 15 License for more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 /* Use the AAPCS ABI by default. */ 27 #undef ARM_DEFAULT_ABI 28 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS 29 30 /* Assume that AAPCS ABIs should adhere to the full BPABI. */ 31 #define TARGET_BPABI (TARGET_AAPCS_BASED) 32 33 /* BPABI targets use EABI frame unwinding tables. */ 34 #undef ARM_UNWIND_INFO 35 #define ARM_UNWIND_INFO 1 36 37 /* TARGET_BIG_ENDIAN_DEFAULT is set in 38 config.gcc for big endian configurations. */ 39 #if TARGET_BIG_ENDIAN_DEFAULT 40 #define TARGET_ENDIAN_DEFAULT MASK_BIG_END 41 #else 42 #define TARGET_ENDIAN_DEFAULT 0 43 #endif 44 45 /* EABI targets should enable interworking by default. */ 46 #undef TARGET_DEFAULT 47 #define TARGET_DEFAULT (MASK_INTERWORK | TARGET_ENDIAN_DEFAULT) 48 49 /* The ARM BPABI functions return a boolean; they use no special 50 calling convention. */ 51 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) TARGET_BPABI 52 53 /* The BPABI integer comparison routines return { -1, 0, 1 }. */ 54 #define TARGET_LIB_INT_CMP_BIASED !TARGET_BPABI 55 56 #define TARGET_FIX_V4BX_SPEC " %{mcpu=arm8|mcpu=arm810|mcpu=strongarm*"\ 57 "|march=armv4|mcpu=fa526|mcpu=fa626:--fix-v4bx}" 58 59 #define TARGET_FDPIC_ASM_SPEC "" 60 61 #define BE8_LINK_SPEC \ 62 "%{!r:%{!mbe32:%:be8_linkopt(%{mlittle-endian:little}" \ 63 " %{mbig-endian:big}" \ 64 " %{mbe8:be8}" \ 65 " %{march=*:arch %*})}}" 66 67 /* Tell the assembler to build BPABI binaries. */ 68 #undef SUBTARGET_EXTRA_ASM_SPEC 69 #define SUBTARGET_EXTRA_ASM_SPEC \ 70 "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5}" TARGET_FIX_V4BX_SPEC \ 71 TARGET_FDPIC_ASM_SPEC 72 73 #ifndef SUBTARGET_EXTRA_LINK_SPEC 74 #define SUBTARGET_EXTRA_LINK_SPEC "" 75 #endif 76 77 /* Split out the EABI common values so other targets can use it. */ 78 #define EABI_LINK_SPEC \ 79 TARGET_FIX_V4BX_SPEC BE8_LINK_SPEC 80 81 /* The generic link spec in elf.h does not support shared libraries. */ 82 #define BPABI_LINK_SPEC \ 83 "%{mbig-endian:-EB} %{mlittle-endian:-EL} " \ 84 "%{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic} " \ 85 "-X" SUBTARGET_EXTRA_LINK_SPEC EABI_LINK_SPEC 86 87 #undef LINK_SPEC 88 #define LINK_SPEC BPABI_LINK_SPEC 89 90 /* The BPABI requires that we always use an out-of-line implementation 91 of RTTI comparison, even if the target supports weak symbols, 92 because the same object file might be used on a target that does 93 not support merging symbols across DLL boundaries. This macro is 94 broken out separately so that it can be used within 95 TARGET_OS_CPP_BUILTINS in configuration files for systems based on 96 the BPABI. */ 97 #define TARGET_BPABI_CPP_BUILTINS() \ 98 do \ 99 { \ 100 builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0"); \ 101 } \ 102 while (false) 103 104 #undef TARGET_OS_CPP_BUILTINS 105 #define TARGET_OS_CPP_BUILTINS() \ 106 TARGET_BPABI_CPP_BUILTINS() 107 108 /* The BPABI specifies the use of .{init,fini}_array. Therefore, we 109 do not want GCC to put anything into the .{init,fini} sections. */ 110 #undef INIT_SECTION_ASM_OP 111 #define INIT_SECTION_ASM_OP "" 112 #undef FINI_SECTION_ASM_OP 113 #define FINI_SECTION_ASM_OP "" 114 #define INIT_ARRAY_SECTION_ASM_OP ARM_EABI_CTORS_SECTION_OP 115 #define FINI_ARRAY_SECTION_ASM_OP ARM_EABI_DTORS_SECTION_OP 116 117 /* The legacy _mcount implementation assumes r11 points to a 118 4-word APCS frame. This is generally not true for EABI targets, 119 particularly not in Thumb mode. We assume the mcount 120 implementation does not require a counter variable (No Counter). 121 Note that __gnu_mcount_nc will be entered with a misaligned stack. 122 This is OK because it uses a special calling convention anyway. */ 123 124 #undef NO_PROFILE_COUNTERS 125 #define NO_PROFILE_COUNTERS 1 126 #undef ARM_FUNCTION_PROFILER 127 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO) \ 128 { \ 129 fprintf (STREAM, "\tpush\t{lr}\n"); \ 130 fprintf (STREAM, "\tbl\t__gnu_mcount_nc\n"); \ 131 } 132 133 #undef SUBTARGET_FRAME_POINTER_REQUIRED 134 #define SUBTARGET_FRAME_POINTER_REQUIRED 0 135 136 /* __gnu_mcount_nc restores the original LR value before returning. Ensure 137 that there is no unnecessary hook set up. */ 138 #undef PROFILE_HOOK 139