1 /* Configuration file for ARM BPABI targets.
2 Copyright (C) 2004-2023 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 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS
28
29 /* Assume that AAPCS ABIs should adhere to the full BPABI. */
30 #define TARGET_BPABI (TARGET_AAPCS_BASED)
31
32 /* BPABI targets use EABI frame unwinding tables. */
33 #undef ARM_UNWIND_INFO
34 #define ARM_UNWIND_INFO 1
35
36 /* TARGET_BIG_ENDIAN_DEFAULT is set in
37 config.gcc for big endian configurations. */
38 #if TARGET_BIG_ENDIAN_DEFAULT
39 #define TARGET_ENDIAN_DEFAULT MASK_BIG_END
40 #else
41 #define TARGET_ENDIAN_DEFAULT 0
42 #endif
43
44 /* EABI targets should enable interworking by default. */
45 #undef TARGET_DEFAULT
46 #define TARGET_DEFAULT (MASK_INTERWORK | TARGET_ENDIAN_DEFAULT)
47
48 /* The ARM BPABI functions return a boolean; they use no special
49 calling convention. */
50 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) TARGET_BPABI
51
52 /* The BPABI integer comparison routines return { -1, 0, 1 }. */
53 #define TARGET_LIB_INT_CMP_BIASED !TARGET_BPABI
54
55 #define TARGET_FIX_V4BX_SPEC " %{mcpu=arm8|mcpu=arm810|mcpu=strongarm*"\
56 "|march=armv4|mcpu=fa526|mcpu=fa626:--fix-v4bx}"
57
58 #define TARGET_FDPIC_ASM_SPEC ""
59
60 #define BE8_LINK_SPEC \
61 "%{!r:%{!mbe32:%:be8_linkopt(%{mlittle-endian:little}" \
62 " %{mbig-endian:big}" \
63 " %{mbe8:be8}" \
64 " %{march=*:arch %*})}}"
65
66 /* Tell the assembler to build BPABI binaries. */
67 #undef SUBTARGET_EXTRA_ASM_SPEC
68 #define SUBTARGET_EXTRA_ASM_SPEC \
69 "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5}" TARGET_FIX_V4BX_SPEC \
70 TARGET_FDPIC_ASM_SPEC
71
72 #ifndef SUBTARGET_EXTRA_LINK_SPEC
73 #define SUBTARGET_EXTRA_LINK_SPEC ""
74 #endif
75
76 /* Split out the EABI common values so other targets can use it. */
77 #define EABI_LINK_SPEC \
78 TARGET_FIX_V4BX_SPEC BE8_LINK_SPEC
79
80 /* The generic link spec in elf.h does not support shared libraries. */
81 #define BPABI_LINK_SPEC \
82 "%{mbig-endian:-EB} %{mlittle-endian:-EL} " \
83 "%{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic} " \
84 "-X" SUBTARGET_EXTRA_LINK_SPEC EABI_LINK_SPEC
85
86 #undef LINK_SPEC
87 #define LINK_SPEC BPABI_LINK_SPEC
88
89 /* The BPABI requires that we always use an out-of-line implementation
90 of RTTI comparison, even if the target supports weak symbols,
91 because the same object file might be used on a target that does
92 not support merging symbols across DLL boundaries. This macro is
93 broken out separately so that it can be used within
94 TARGET_OS_CPP_BUILTINS in configuration files for systems based on
95 the BPABI. */
96 #define TARGET_BPABI_CPP_BUILTINS() \
97 do \
98 { \
99 builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0"); \
100 } \
101 while (false)
102
103 #undef TARGET_OS_CPP_BUILTINS
104 #define TARGET_OS_CPP_BUILTINS() \
105 TARGET_BPABI_CPP_BUILTINS()
106
107 /* The BPABI specifies the use of .{init,fini}_array. Therefore, we
108 do not want GCC to put anything into the .{init,fini} sections. */
109 #undef INIT_SECTION_ASM_OP
110 #undef FINI_SECTION_ASM_OP
111 #define INIT_ARRAY_SECTION_ASM_OP ARM_EABI_CTORS_SECTION_OP
112 #define FINI_ARRAY_SECTION_ASM_OP ARM_EABI_DTORS_SECTION_OP
113
114 /* The legacy _mcount implementation assumes r11 points to a
115 4-word APCS frame. This is generally not true for EABI targets,
116 particularly not in Thumb mode. We assume the mcount
117 implementation does not require a counter variable (No Counter).
118 Note that __gnu_mcount_nc will be entered with a misaligned stack.
119 This is OK because it uses a special calling convention anyway. */
120
121 #undef NO_PROFILE_COUNTERS
122 #define NO_PROFILE_COUNTERS 1
123 #undef ARM_FUNCTION_PROFILER
124 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO) \
125 { \
126 fprintf (STREAM, "\tpush\t{lr}\n"); \
127 fprintf (STREAM, "\tbl\t__gnu_mcount_nc\n"); \
128 }
129
130 #undef SUBTARGET_FRAME_POINTER_REQUIRED
131 #define SUBTARGET_FRAME_POINTER_REQUIRED 0
132
133 /* __gnu_mcount_nc restores the original LR value before returning. Ensure
134 that there is no unnecessary hook set up. */
135 #undef PROFILE_HOOK