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#elif defined(__ELF__)
32#define HIDDEN(name) .hidden name
33#define LOCAL_LABEL(name) .L_##name
34#define FILE_LEVEL_DIRECTIVE
35#if defined(__arm__)
36#define SYMBOL_IS_FUNC(name) .type name,%function
37#else
38#define SYMBOL_IS_FUNC(name) .type name,@function
39#endif
40#else
41#define HIDDEN_DIRECTIVE(name)
42#define LOCAL_LABEL(name) .L ## name
43#define SYMBOL_IS_FUNC(name)                                                   \
44  .def name SEPARATOR                                                          \
45    .scl 2 SEPARATOR                                                           \
46    .type 32 SEPARATOR                                                         \
47  .endef
48#define FILE_LEVEL_DIRECTIVE
49#endif
50
51#if defined(__arm__)
52#ifndef __ARM_ARCH
53#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) ||                     \
54    defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) ||                    \
55    defined(__ARM_ARCH_7EM__)
56#define __ARM_ARCH 7
57#endif
58#endif
59
60#ifndef __ARM_ARCH
61#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) ||                     \
62    defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) ||                    \
63    defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6ZM__)
64#define __ARM_ARCH 6
65#endif
66#endif
67
68#ifndef __ARM_ARCH
69#if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) ||                     \
70    defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_5TEJ__)
71#define __ARM_ARCH 5
72#endif
73#endif
74
75#ifndef __ARM_ARCH
76#define __ARM_ARCH 4
77#endif
78
79#if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
80#define ARM_HAS_BX
81#endif
82#if !defined(__ARM_FEATURE_CLZ) &&                                             \
83    (__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__)))
84#define __ARM_FEATURE_CLZ
85#endif
86
87#ifdef ARM_HAS_BX
88#define JMP(r) bx r
89#define JMPc(r, c) bx##c r
90#else
91#define JMP(r) mov pc, r
92#define JMPc(r, c) mov##c pc, r
93#endif
94#endif
95
96#define GLUE2(a, b) a##b
97#define GLUE(a, b) GLUE2(a, b)
98#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
99
100#ifdef VISIBILITY_HIDDEN
101#define DECLARE_SYMBOL_VISIBILITY(name)                                        \
102  HIDDEN(SYMBOL_NAME(name)) SEPARATOR
103#else
104#define DECLARE_SYMBOL_VISIBILITY(name)
105#endif
106
107#define DEFINE_COMPILERRT_FUNCTION(name)                                       \
108  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
109  .globl SYMBOL_NAME(name) SEPARATOR                                           \
110  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
111  DECLARE_SYMBOL_VISIBILITY(name)                                              \
112  SYMBOL_NAME(name):
113
114#define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name)                               \
115  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
116  .globl SYMBOL_NAME(name) SEPARATOR                                           \
117  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
118  HIDDEN(SYMBOL_NAME(name)) SEPARATOR                                          \
119  SYMBOL_NAME(name):
120
121#define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name)                     \
122  .globl name SEPARATOR                                                        \
123  SYMBOL_IS_FUNC(name) SEPARATOR                                               \
124  HIDDEN(name) SEPARATOR                                                       \
125  name:
126
127#define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
128  .globl SYMBOL_NAME(name) SEPARATOR                                           \
129  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
130  .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
131
132#if defined(__ARM_EABI__)
133#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)                          \
134  DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
135#else
136#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
137#endif
138
139#ifdef __ELF__
140#define END_COMPILERRT_FUNCTION(name)                                          \
141  .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
142#else
143#define END_COMPILERRT_FUNCTION(name)
144#endif
145
146#endif /* COMPILERRT_ASSEMBLY_H */
147