assembly.h revision 345018 
1/* ===-- assembly.h - libUnwind 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 libUnwind assembler source.
11 * This file is not part of the interface of this library.
12 *
13 * ===----------------------------------------------------------------------===
14 */
15
16#ifndef UNWIND_ASSEMBLY_H
17#define UNWIND_ASSEMBLY_H
18
19#if defined(__powerpc64__)
20#define SEPARATOR ;
21#define PPC64_OFFS_SRR0   0
22#define PPC64_OFFS_CR     272
23#define PPC64_OFFS_XER    280
24#define PPC64_OFFS_LR     288
25#define PPC64_OFFS_CTR    296
26#define PPC64_OFFS_VRSAVE 304
27#define PPC64_OFFS_FP     312
28#define PPC64_OFFS_V      824
29#ifdef _ARCH_PWR8
30#define PPC64_HAS_VMX
31#endif
32#elif defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__)
33#define SEPARATOR @
34#elif defined(__arm64__)
35#define SEPARATOR %%
36#else
37#define SEPARATOR ;
38#endif
39
40#define GLUE2(a, b) a ## b
41#define GLUE(a, b) GLUE2(a, b)
42#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
43
44#if defined(__APPLE__)
45
46#define SYMBOL_IS_FUNC(name)
47#define EXPORT_SYMBOL(name)
48#define HIDDEN_SYMBOL(name) .private_extern name
49#define NO_EXEC_STACK_DIRECTIVE
50
51#elif defined(__ELF__)
52
53#if defined(__arm__)
54#define SYMBOL_IS_FUNC(name) .type name,%function
55#else
56#define SYMBOL_IS_FUNC(name) .type name,@function
57#endif
58#define EXPORT_SYMBOL(name)
59#define HIDDEN_SYMBOL(name) .hidden name
60
61#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
62    defined(__linux__)
63#define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
64#else
65#define NO_EXEC_STACK_DIRECTIVE
66#endif
67
68#elif defined(_WIN32)
69
70#define SYMBOL_IS_FUNC(name)                                                   \
71  .def name SEPARATOR                                                          \
72    .scl 2 SEPARATOR                                                           \
73    .type 32 SEPARATOR                                                         \
74  .endef
75#define EXPORT_SYMBOL2(name)                              \
76  .section .drectve,"yn" SEPARATOR                        \
77  .ascii "-export:", #name, "\0" SEPARATOR                \
78  .text
79#if defined(_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS)
80#define EXPORT_SYMBOL(name)
81#else
82#define EXPORT_SYMBOL(name) EXPORT_SYMBOL2(name)
83#endif
84#define HIDDEN_SYMBOL(name)
85
86#define NO_EXEC_STACK_DIRECTIVE
87
88#elif defined(__sparc__)
89
90#else
91
92#error Unsupported target
93
94#endif
95
96#define DEFINE_LIBUNWIND_FUNCTION(name)                   \
97  .globl SYMBOL_NAME(name) SEPARATOR                      \
98  EXPORT_SYMBOL(name) SEPARATOR                           \
99  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR             \
100  SYMBOL_NAME(name):
101
102#define DEFINE_LIBUNWIND_PRIVATE_FUNCTION(name)           \
103  .globl SYMBOL_NAME(name) SEPARATOR                      \
104  HIDDEN_SYMBOL(SYMBOL_NAME(name)) SEPARATOR              \
105  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR             \
106  SYMBOL_NAME(name):
107
108#if defined(__arm__)
109#if !defined(__ARM_ARCH)
110#define __ARM_ARCH 4
111#endif
112
113#if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
114#define ARM_HAS_BX
115#endif
116
117#ifdef ARM_HAS_BX
118#define JMP(r) bx r
119#else
120#define JMP(r) mov pc, r
121#endif
122#endif /* __arm__ */
123
124#endif /* UNWIND_ASSEMBLY_H */
125