1/* ===-- assembly.h - compiler-rt assembler support macros -----------------===
2 *
3 *                     The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file defines macros for use in compiler-rt assembler source.
11 * This file is not part of the interface of this library.
12 *
13 * ===----------------------------------------------------------------------===
14 */
15
16#ifndef COMPILERRT_ASSEMBLY_H
17#define COMPILERRT_ASSEMBLY_H
18
19#if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__)
20#define SEPARATOR @
21#else
22#define SEPARATOR ;
23#endif
24
25#if defined(__APPLE__)
26#define HIDDEN(name) .private_extern name
27#define LOCAL_LABEL(name) L_##name
28// tell linker it can break up file at label boundaries
29#define FILE_LEVEL_DIRECTIVE .subsections_via_symbols
30#define SYMBOL_IS_FUNC(name)
31#define CONST_SECTION .const
32
33#define NO_EXEC_STACK_DIRECTIVE
34
35#elif defined(__ELF__)
36
37#define HIDDEN(name) .hidden name
38#define LOCAL_LABEL(name) .L_##name
39#define FILE_LEVEL_DIRECTIVE
40#if defined(__arm__)
41#define SYMBOL_IS_FUNC(name) .type name,%function
42#else
43#define SYMBOL_IS_FUNC(name) .type name,@function
44#endif
45#define CONST_SECTION .section .rodata
46
47#if defined(__GNU__) || defined(__ANDROID__) || defined(__FreeBSD__)
48#define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
49#else
50#define NO_EXEC_STACK_DIRECTIVE
51#endif
52
53#else // !__APPLE__ && !__ELF__
54
55#define HIDDEN(name)
56#define LOCAL_LABEL(name) .L ## name
57#define FILE_LEVEL_DIRECTIVE
58#define SYMBOL_IS_FUNC(name)                                                   \
59  .def name SEPARATOR                                                          \
60    .scl 2 SEPARATOR                                                           \
61    .type 32 SEPARATOR                                                         \
62  .endef
63#define CONST_SECTION .section .rdata,"rd"
64
65#define NO_EXEC_STACK_DIRECTIVE
66
67#endif
68
69#if defined(__arm__)
70#if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
71#define ARM_HAS_BX
72#endif
73#if !defined(__ARM_FEATURE_CLZ) &&                                             \
74    (__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__)))
75#define __ARM_FEATURE_CLZ
76#endif
77
78#ifdef ARM_HAS_BX
79#define JMP(r) bx r
80#define JMPc(r, c) bx##c r
81#else
82#define JMP(r) mov pc, r
83#define JMPc(r, c) mov##c pc, r
84#endif
85
86// pop {pc} can't switch Thumb mode on ARMv4T
87#if __ARM_ARCH >= 5
88#define POP_PC() pop {pc}
89#else
90#define POP_PC()                                                               \
91  pop {ip};                                                                    \
92  JMP(ip)
93#endif
94
95#if __ARM_ARCH_ISA_THUMB == 2
96#define IT(cond)  it cond
97#define ITT(cond) itt cond
98#else
99#define IT(cond)
100#define ITT(cond)
101#endif
102
103#if __ARM_ARCH_ISA_THUMB == 2
104#define WIDE(op) op.w
105#else
106#define WIDE(op) op
107#endif
108#endif
109
110#define GLUE2(a, b) a##b
111#define GLUE(a, b) GLUE2(a, b)
112#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
113
114#ifdef VISIBILITY_HIDDEN
115#define DECLARE_SYMBOL_VISIBILITY(name)                                        \
116  HIDDEN(SYMBOL_NAME(name)) SEPARATOR
117#else
118#define DECLARE_SYMBOL_VISIBILITY(name)
119#endif
120
121#define DEFINE_COMPILERRT_FUNCTION(name)                                       \
122  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
123  .globl SYMBOL_NAME(name) SEPARATOR                                           \
124  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
125  DECLARE_SYMBOL_VISIBILITY(name)                                              \
126  SYMBOL_NAME(name):
127
128#define DEFINE_COMPILERRT_THUMB_FUNCTION(name)                                 \
129  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
130  .globl SYMBOL_NAME(name) SEPARATOR                                           \
131  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
132  DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR                                    \
133  .thumb_func SEPARATOR                                                        \
134  SYMBOL_NAME(name):
135
136#define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name)                               \
137  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
138  .globl SYMBOL_NAME(name) SEPARATOR                                           \
139  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
140  HIDDEN(SYMBOL_NAME(name)) SEPARATOR                                          \
141  SYMBOL_NAME(name):
142
143#define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name)                     \
144  .globl name SEPARATOR                                                        \
145  SYMBOL_IS_FUNC(name) SEPARATOR                                               \
146  HIDDEN(name) SEPARATOR                                                       \
147  name:
148
149#define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
150  .globl SYMBOL_NAME(name) SEPARATOR                                           \
151  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
152  .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
153
154#if defined(__ARM_EABI__)
155#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)                          \
156  DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
157#else
158#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
159#endif
160
161#ifdef __ELF__
162#define END_COMPILERRT_FUNCTION(name)                                          \
163  .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
164#else
165#define END_COMPILERRT_FUNCTION(name)
166#endif
167
168#endif /* COMPILERRT_ASSEMBLY_H */
169