1 /* Definitions of target machine for GNU compiler, FreeBSD/arm version.
2 Copyright (C) 2002-2023 Free Software Foundation, Inc.
3 Contributed by Wasabi Systems, Inc.
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
22 along with GCC; see the file COPYING3. If not see
23 <http://www.gnu.org/licenses/>. */
24
25 #undef SUBTARGET_CPP_SPEC
26 #define SUBTARGET_CPP_SPEC FBSD_CPP_SPEC
27
28 #undef SUBTARGET_EXTRA_SPECS
29 #define SUBTARGET_EXTRA_SPECS \
30 { "subtarget_extra_asm_spec", SUBTARGET_EXTRA_ASM_SPEC }, \
31 { "subtarget_asm_float_spec", SUBTARGET_ASM_FLOAT_SPEC }, \
32 { "fbsd_dynamic_linker", FBSD_DYNAMIC_LINKER }
33
34 #undef SUBTARGET_EXTRA_ASM_SPEC
35 #define SUBTARGET_EXTRA_ASM_SPEC \
36 "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5} " TARGET_FIX_V4BX_SPEC " \
37 %{" FPIE_OR_FPIC_SPEC ":-k}"
38
39 #undef SUBTARGET_ASM_FLOAT_SPEC
40 #ifdef TARGET_FREEBSD_ARM_HARD_FLOAT
41 /* Default to full vfp if we build for arm*hf. */
42 #define SUBTARGET_ASM_FLOAT_SPEC "%{!mfpu=*:-mfpu=vfp}"
43 #else
44 #define SUBTARGET_ASM_FLOAT_SPEC "%{!mfpu=*:-mfpu=softvfp}"
45 #endif
46
47 #undef LINK_SPEC
48 #define LINK_SPEC " \
49 %{p:%nconsider using `-pg' instead of `-p' with gprof (1)} \
50 %{v:-V} \
51 %{assert*} %{R*} %{rpath*} %{defsym*} \
52 %{shared:-Bshareable %{h*} %{soname*}} \
53 %{!shared: \
54 %{!static: \
55 %{rdynamic:-export-dynamic} \
56 %{!dynamic-linker:-dynamic-linker %(fbsd_dynamic_linker) }} \
57 %{static:-Bstatic}} \
58 %{!static:--hash-style=both --enable-new-dtags} \
59 %{symbolic:-Bsymbolic} \
60 -X %{mbig-endian:-EB} %{mlittle-endian:-EL}"
61
62 /* TARGET_BIG_ENDIAN_DEFAULT is set in
63 config.gcc for big endian configurations. */
64 #if TARGET_BIG_ENDIAN_DEFAULT
65 #define TARGET_ENDIAN_DEFAULT MASK_BIG_END
66 #define TARGET_ENDIAN_OPTION "mbig-endian"
67 #define TARGET_LINKER_EMULATION "armelfb_fbsd"
68 #else
69 #define TARGET_ENDIAN_DEFAULT 0
70 #define TARGET_ENDIAN_OPTION "mlittle-endian"
71 #define TARGET_LINKER_EMULATION "armelf_fbsd"
72 #endif
73
74 #undef SUBTARGET_EXTRA_LINK_SPEC
75 #define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION " -p"
76
77 #undef TARGET_OS_CPP_BUILTINS
78 #define TARGET_OS_CPP_BUILTINS() \
79 do \
80 { \
81 FBSD_TARGET_OS_CPP_BUILTINS (); \
82 TARGET_BPABI_CPP_BUILTINS (); \
83 } \
84 while (false)
85
86 /* We default to a soft-float ABI so that binaries can run on all
87 target hardware. */
88 #undef TARGET_DEFAULT_FLOAT_ABI
89 #ifdef TARGET_FREEBSD_ARM_HARD_FLOAT
90 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
91 #else
92 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
93 #endif
94
95 #undef ARM_DEFAULT_ABI
96
97 /* AACPS_LINUX has access to kernel atomic ops while we don't.
98 But AACPS defaults to short_enums. */
99 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS_LINUX
100
101 #undef TARGET_DEFAULT
102 #define TARGET_DEFAULT (MASK_INTERWORK | TARGET_ENDIAN_DEFAULT)
103
104 /* We do not have any MULTILIB_OPTIONS specified, so there are no
105 MULTILIB_DEFAULTS. */
106 #undef MULTILIB_DEFAULTS
107
108 /* Use the AAPCS type for wchar_t, override the one from config/freebsd.h. */
109 #undef WCHAR_TYPE
110 #define WCHAR_TYPE "unsigned int"
111
112 #undef WCHAR_TYPE_SIZE
113 #define WCHAR_TYPE_SIZE BITS_PER_WORD
114
115 /* FreeBSD 10 does not support unaligned access for armv6 and up.
116 Unaligned access support was added in FreeBSD 11. */
117 #if FBSD_MAJOR < 11
118 #define SUBTARGET_OVERRIDE_INTERNAL_OPTIONS \
119 do { \
120 if (opts_set->x_unaligned_access == 1) \
121 warning (0, "target OS does not support unaligned accesses"); \
122 if (opts->x_unaligned_access) \
123 opts->x_unaligned_access = 0; \
124 } while (0)
125 #endif
126
127 #undef MAX_SYNC_LIBFUNC_SIZE
128 #define MAX_SYNC_LIBFUNC_SIZE 4 /* UNITS_PER_WORD not defined yet. */
129
130 /* FreeBSD does its profiling differently to the Acorn compiler. We
131 don't need a word following the mcount call; and to skip it
132 requires either an assembly stub or use of fomit-frame-pointer when
133 compiling the profiling functions. Since we break Acorn CC
134 compatibility below a little more won't hurt. */
135
136 #undef ARM_FUNCTION_PROFILER
137 #define ARM_FUNCTION_PROFILER(STREAM,LABELNO) \
138 { \
139 asm_fprintf (STREAM, "\tmov\t%Rip, %Rlr\n"); \
140 asm_fprintf (STREAM, "\tbl\t__mcount%s\n", \
141 (TARGET_ARM && NEED_PLT_RELOC) \
142 ? "(PLT)" : ""); \
143 }
144
145 /* Clear the instruction cache from `BEG' to `END'. This makes a
146 call to the ARM_SYNC_ICACHE architecture specific syscall. */
147 #define CLEAR_INSN_CACHE(BEG, END) \
148 do \
149 { \
150 extern int sysarch (int number, void *args); \
151 struct \
152 { \
153 unsigned int addr; \
154 int len; \
155 } s; \
156 s.addr = (unsigned int) (BEG); \
157 s.len = (END) - (BEG); \
158 (void) sysarch (0, &s); \
159 } \
160 while (0)
161
162 /* This is how we tell the assembler that two symbols have the same value. */
163 #define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
164 do \
165 { \
166 assemble_name (FILE, NAME1); \
167 fputs (" = ", FILE); \
168 assemble_name (FILE, NAME2); \
169 fputc ('\n', FILE); \
170 } \
171 while (0)
172
173 /* Add .note.GNU-stack. */
174 #undef NEED_INDICATE_EXEC_STACK
175 #define NEED_INDICATE_EXEC_STACK 1
176
177 #define ARM_TARGET2_DWARF_FORMAT (DW_EH_PE_pcrel | DW_EH_PE_indirect)
178