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#elif defined(__ELF__)
34
35#define HIDDEN(name) .hidden name
36#define LOCAL_LABEL(name) .L_##name
37#define FILE_LEVEL_DIRECTIVE
38#if defined(__arm__)
39#define SYMBOL_IS_FUNC(name) .type name,%function
40#else
41#define SYMBOL_IS_FUNC(name) .type name,@function
42#endif
43#define CONST_SECTION .section .rodata
44
45#else // !__APPLE__ && !__ELF__
46
47#define HIDDEN(name)
48#define LOCAL_LABEL(name) .L ## name
49#define FILE_LEVEL_DIRECTIVE
50#define SYMBOL_IS_FUNC(name)                                                   \
51  .def name SEPARATOR                                                          \
52    .scl 2 SEPARATOR                                                           \
53    .type 32 SEPARATOR                                                         \
54  .endef
55#define CONST_SECTION .section .rdata,"rd"
56
57#endif
58
59#if defined(__arm__)
60#if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
61#define ARM_HAS_BX
62#endif
63#if !defined(__ARM_FEATURE_CLZ) &&                                             \
64    (__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__)))
65#define __ARM_FEATURE_CLZ
66#endif
67
68#ifdef ARM_HAS_BX
69#define JMP(r) bx r
70#define JMPc(r, c) bx##c r
71#else
72#define JMP(r) mov pc, r
73#define JMPc(r, c) mov##c pc, r
74#endif
75
76// pop {pc} can't switch Thumb mode on ARMv4T
77#if __ARM_ARCH >= 5
78#define POP_PC() pop {pc}
79#else
80#define POP_PC()                                                               \
81  pop {ip};                                                                    \
82  JMP(ip)
83#endif
84
85#if __ARM_ARCH_ISA_THUMB == 2
86#define IT(cond)  it cond
87#define ITT(cond) itt cond
88#else
89#define IT(cond)
90#define ITT(cond)
91#endif
92
93#if __ARM_ARCH_ISA_THUMB == 2
94#define WIDE(op) op.w
95#else
96#define WIDE(op) op
97#endif
98#endif
99
100#define GLUE2(a, b) a##b
101#define GLUE(a, b) GLUE2(a, b)
102#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
103
104#ifdef VISIBILITY_HIDDEN
105#define DECLARE_SYMBOL_VISIBILITY(name)                                        \
106  HIDDEN(SYMBOL_NAME(name)) SEPARATOR
107#else
108#define DECLARE_SYMBOL_VISIBILITY(name)
109#endif
110
111#define DEFINE_COMPILERRT_FUNCTION(name)                                       \
112  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
113  .globl SYMBOL_NAME(name) SEPARATOR                                           \
114  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
115  DECLARE_SYMBOL_VISIBILITY(name)                                              \
116  SYMBOL_NAME(name):
117
118#define DEFINE_COMPILERRT_THUMB_FUNCTION(name)                                 \
119  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
120  .globl SYMBOL_NAME(name) SEPARATOR                                           \
121  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
122  DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR                                    \
123  .thumb_func SEPARATOR                                                        \
124  SYMBOL_NAME(name):
125
126#define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name)                               \
127  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
128  .globl SYMBOL_NAME(name) SEPARATOR                                           \
129  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
130  HIDDEN(SYMBOL_NAME(name)) SEPARATOR                                          \
131  SYMBOL_NAME(name):
132
133#define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name)                     \
134  .globl name SEPARATOR                                                        \
135  SYMBOL_IS_FUNC(name) SEPARATOR                                               \
136  HIDDEN(name) SEPARATOR                                                       \
137  name:
138
139#define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
140  .globl SYMBOL_NAME(name) SEPARATOR                                           \
141  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
142  .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
143
144#if defined(__ARM_EABI__)
145#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)                          \
146  DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
147#else
148#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
149#endif
150
151#ifdef __ELF__
152#define END_COMPILERRT_FUNCTION(name)                                          \
153  .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
154#else
155#define END_COMPILERRT_FUNCTION(name)
156#endif
157
158#endif /* COMPILERRT_ASSEMBLY_H */
159