[thirdparty/gcc.git] / libsanitizer / builtins / assembly.h

/* ===-- assembly.h - compiler-rt assembler support macros -----------------===
 *
 *                     The LLVM Compiler Infrastructure
 *
 * This file is dual licensed under the MIT and the University of Illinois Open
 * Source Licenses. See LICENSE.TXT for details.
 *
 * ===----------------------------------------------------------------------===
 *
 * This file defines macros for use in compiler-rt assembler source.
 * This file is not part of the interface of this library.
 *
 * ===----------------------------------------------------------------------===
 */

#ifndef COMPILERRT_ASSEMBLY_H
#define COMPILERRT_ASSEMBLY_H

#if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__)
#define SEPARATOR @
#else
#define SEPARATOR ;
#endif

#if defined(__APPLE__)
#define HIDDEN(name) .private_extern name
#define LOCAL_LABEL(name) L_##name
// tell linker it can break up file at label boundaries
#define FILE_LEVEL_DIRECTIVE .subsections_via_symbols
#define SYMBOL_IS_FUNC(name)
#define CONST_SECTION .const

#define NO_EXEC_STACK_DIRECTIVE

#elif defined(__ELF__)

#define HIDDEN(name) .hidden name
#define LOCAL_LABEL(name) .L_##name
#define FILE_LEVEL_DIRECTIVE
#if defined(__arm__)
#define SYMBOL_IS_FUNC(name) .type name,%function
#else
#define SYMBOL_IS_FUNC(name) .type name,@function
#endif
#define CONST_SECTION .section .rodata

#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
    defined(__linux__)
#define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
#else
#define NO_EXEC_STACK_DIRECTIVE
#endif

#else // !__APPLE__ && !__ELF__

#define HIDDEN(name)
#define LOCAL_LABEL(name) .L ## name
#define FILE_LEVEL_DIRECTIVE
#define SYMBOL_IS_FUNC(name)                                                   \
  .def name SEPARATOR                                                          \
    .scl 2 SEPARATOR                                                           \
    .type 32 SEPARATOR                                                         \
  .endef
#define CONST_SECTION .section .rdata,"rd"

#define NO_EXEC_STACK_DIRECTIVE

#endif

#if defined(__arm__)

/*
 * Determine actual [ARM][THUMB[1][2]] ISA using compiler predefined macros:
 * - for '-mthumb -march=armv6' compiler defines '__thumb__'
 * - for '-mthumb -march=armv7' compiler defines '__thumb__' and '__thumb2__'
 */
#if defined(__thumb2__) || defined(__thumb__)
#define DEFINE_CODE_STATE .thumb SEPARATOR
#define DECLARE_FUNC_ENCODING    .thumb_func SEPARATOR
#if defined(__thumb2__)
#define USE_THUMB_2
#define IT(cond)  it cond
#define ITT(cond) itt cond
#define ITE(cond) ite cond
#else
#define USE_THUMB_1
#define IT(cond)
#define ITT(cond)
#define ITE(cond)
#endif // defined(__thumb__2)
#else // !defined(__thumb2__) && !defined(__thumb__)
#define DEFINE_CODE_STATE .arm SEPARATOR
#define DECLARE_FUNC_ENCODING
#define IT(cond)
#define ITT(cond)
#define ITE(cond)
#endif

#if defined(USE_THUMB_1) && defined(USE_THUMB_2)
#error "USE_THUMB_1 and USE_THUMB_2 can't be defined together."
#endif

#if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
#define ARM_HAS_BX
#endif
#if !defined(__ARM_FEATURE_CLZ) && !defined(USE_THUMB_1) &&  \
    (__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__)))
#define __ARM_FEATURE_CLZ
#endif

#ifdef ARM_HAS_BX
#define JMP(r) bx r
#define JMPc(r, c) bx##c r
#else
#define JMP(r) mov pc, r
#define JMPc(r, c) mov##c pc, r
#endif

// pop {pc} can't switch Thumb mode on ARMv4T
#if __ARM_ARCH >= 5
#define POP_PC() pop {pc}
#else
#define POP_PC()                                                               \
  pop {ip};                                                                    \
  JMP(ip)
#endif

#if defined(USE_THUMB_2)
#define WIDE(op) op.w
#else
#define WIDE(op) op
#endif
#else // !defined(__arm)
#define DECLARE_FUNC_ENCODING
#define DEFINE_CODE_STATE
#endif

#define GLUE2(a, b) a##b
#define GLUE(a, b) GLUE2(a, b)
#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)

#ifdef VISIBILITY_HIDDEN
#define DECLARE_SYMBOL_VISIBILITY(name)                                        \
  HIDDEN(SYMBOL_NAME(name)) SEPARATOR
#else
#define DECLARE_SYMBOL_VISIBILITY(name)
#endif

#define DEFINE_COMPILERRT_FUNCTION(name)                                       \
  DEFINE_CODE_STATE                                                            \
  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
  .globl SYMBOL_NAME(name) SEPARATOR                                           \
  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
  DECLARE_SYMBOL_VISIBILITY(name)                                              \
  DECLARE_FUNC_ENCODING                                                        \
  SYMBOL_NAME(name):

#define DEFINE_COMPILERRT_THUMB_FUNCTION(name)                                 \
  DEFINE_CODE_STATE                                                            \
  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
  .globl SYMBOL_NAME(name) SEPARATOR                                           \
  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
  DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR                                    \
  .thumb_func SEPARATOR                                                        \
  SYMBOL_NAME(name):

#define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name)                               \
  DEFINE_CODE_STATE                                                            \
  FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
  .globl SYMBOL_NAME(name) SEPARATOR                                           \
  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
  HIDDEN(SYMBOL_NAME(name)) SEPARATOR                                          \
  DECLARE_FUNC_ENCODING                                                        \
  SYMBOL_NAME(name):

#define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name)                     \
  DEFINE_CODE_STATE                                                            \
  .globl name SEPARATOR                                                        \
  SYMBOL_IS_FUNC(name) SEPARATOR                                               \
  HIDDEN(name) SEPARATOR                                                       \
  DECLARE_FUNC_ENCODING                                                        \
  name:

#define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
  .globl SYMBOL_NAME(name) SEPARATOR                                           \
  SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
  DECLARE_SYMBOL_VISIBILITY(SYMBOL_NAME(name)) SEPARATOR                       \
  .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR

#if defined(__ARM_EABI__)
#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)                          \
  DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
#else
#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
#endif

#ifdef __ELF__
#define END_COMPILERRT_FUNCTION(name)                                          \
  .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
#else
#define END_COMPILERRT_FUNCTION(name)
#endif

#endif /* COMPILERRT_ASSEMBLY_H */
Commit	Line	Data
10189819 MO	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
5d3805fc JJ	47	#if defined(__GNU__) \|\| defined(__FreeBSD__) \|\| defined(__Fuchsia__) \|\| \
5d3805fc JJ	48	defined(__linux__)
10189819 MO	49	#define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
	50	#else
	51	#define NO_EXEC_STACK_DIRECTIVE
	52	#endif
	53
	54	#else // !__APPLE__ && !__ELF__
	55
	56	#define HIDDEN(name)
	57	#define LOCAL_LABEL(name) .L ## name
	58	#define FILE_LEVEL_DIRECTIVE
	59	#define SYMBOL_IS_FUNC(name) \
	60	.def name SEPARATOR \
	61	.scl 2 SEPARATOR \
	62	.type 32 SEPARATOR \
	63	.endef
	64	#define CONST_SECTION .section .rdata,"rd"
	65
	66	#define NO_EXEC_STACK_DIRECTIVE
	67
	68	#endif
	69
	70	#if defined(__arm__)
5d3805fc JJ	71
	72	/*
	73	* Determine actual [ARM][THUMB[1][2]] ISA using compiler predefined macros:
	74	* - for '-mthumb -march=armv6' compiler defines '__thumb__'
	75	* - for '-mthumb -march=armv7' compiler defines '__thumb__' and '__thumb2__'
	76	*/
	77	#if defined(__thumb2__) \|\| defined(__thumb__)
	78	#define DEFINE_CODE_STATE .thumb SEPARATOR
	79	#define DECLARE_FUNC_ENCODING .thumb_func SEPARATOR
	80	#if defined(__thumb2__)
	81	#define USE_THUMB_2
	82	#define IT(cond) it cond
	83	#define ITT(cond) itt cond
	84	#define ITE(cond) ite cond
	85	#else
	86	#define USE_THUMB_1
	87	#define IT(cond)
	88	#define ITT(cond)
	89	#define ITE(cond)
	90	#endif // defined(__thumb__2)
	91	#else // !defined(__thumb2__) && !defined(__thumb__)
	92	#define DEFINE_CODE_STATE .arm SEPARATOR
	93	#define DECLARE_FUNC_ENCODING
	94	#define IT(cond)
	95	#define ITT(cond)
	96	#define ITE(cond)
	97	#endif
	98
	99	#if defined(USE_THUMB_1) && defined(USE_THUMB_2)
	100	#error "USE_THUMB_1 and USE_THUMB_2 can't be defined together."
	101	#endif
	102
10189819 MO	103	#if defined(__ARM_ARCH_4T__) \|\| __ARM_ARCH >= 5
	104	#define ARM_HAS_BX
	105	#endif
5d3805fc	106	#if !defined(__ARM_FEATURE_CLZ) && !defined(USE_THUMB_1) && \
10189819 MO	107	(__ARM_ARCH >= 6 \|\| (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__)))
	108	#define __ARM_FEATURE_CLZ
	109	#endif
	110
	111	#ifdef ARM_HAS_BX
	112	#define JMP(r) bx r
	113	#define JMPc(r, c) bx##c r
	114	#else
	115	#define JMP(r) mov pc, r
	116	#define JMPc(r, c) mov##c pc, r
	117	#endif
	118
	119	// pop {pc} can't switch Thumb mode on ARMv4T
	120	#if __ARM_ARCH >= 5
	121	#define POP_PC() pop {pc}
	122	#else
	123	#define POP_PC() \
	124	pop {ip}; \
	125	JMP(ip)
	126	#endif
	127
5d3805fc	128	#if defined(USE_THUMB_2)
10189819 MO	129	#define WIDE(op) op.w
	130	#else
	131	#define WIDE(op) op
	132	#endif
5d3805fc JJ	133	#else // !defined(__arm)
	134	#define DECLARE_FUNC_ENCODING
	135	#define DEFINE_CODE_STATE
10189819 MO	136	#endif
	137
	138	#define GLUE2(a, b) a##b
	139	#define GLUE(a, b) GLUE2(a, b)
	140	#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
	141
	142	#ifdef VISIBILITY_HIDDEN
	143	#define DECLARE_SYMBOL_VISIBILITY(name) \
	144	HIDDEN(SYMBOL_NAME(name)) SEPARATOR
	145	#else
	146	#define DECLARE_SYMBOL_VISIBILITY(name)
	147	#endif
	148
	149	#define DEFINE_COMPILERRT_FUNCTION(name) \
5d3805fc	150	DEFINE_CODE_STATE \
10189819 MO	151	FILE_LEVEL_DIRECTIVE SEPARATOR \
	152	.globl SYMBOL_NAME(name) SEPARATOR \
	153	SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
	154	DECLARE_SYMBOL_VISIBILITY(name) \
5d3805fc	155	DECLARE_FUNC_ENCODING \
10189819 MO	156	SYMBOL_NAME(name):
	157
	158	#define DEFINE_COMPILERRT_THUMB_FUNCTION(name) \
5d3805fc	159	DEFINE_CODE_STATE \
10189819 MO	160	FILE_LEVEL_DIRECTIVE SEPARATOR \
	161	.globl SYMBOL_NAME(name) SEPARATOR \
	162	SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
	163	DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR \
	164	.thumb_func SEPARATOR \
	165	SYMBOL_NAME(name):
	166
	167	#define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name) \
5d3805fc	168	DEFINE_CODE_STATE \
10189819 MO	169	FILE_LEVEL_DIRECTIVE SEPARATOR \
	170	.globl SYMBOL_NAME(name) SEPARATOR \
	171	SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
	172	HIDDEN(SYMBOL_NAME(name)) SEPARATOR \
5d3805fc	173	DECLARE_FUNC_ENCODING \
10189819 MO	174	SYMBOL_NAME(name):
	175
	176	#define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name) \
5d3805fc	177	DEFINE_CODE_STATE \
10189819 MO	178	.globl name SEPARATOR \
	179	SYMBOL_IS_FUNC(name) SEPARATOR \
	180	HIDDEN(name) SEPARATOR \
5d3805fc	181	DECLARE_FUNC_ENCODING \
10189819 MO	182	name:
	183
	184	#define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target) \
	185	.globl SYMBOL_NAME(name) SEPARATOR \
	186	SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
	187	DECLARE_SYMBOL_VISIBILITY(SYMBOL_NAME(name)) SEPARATOR \
	188	.set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
	189
	190	#if defined(__ARM_EABI__)
	191	#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name) \
	192	DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
	193	#else
	194	#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
	195	#endif
	196
	197	#ifdef __ELF__
	198	#define END_COMPILERRT_FUNCTION(name) \
	199	.size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
	200	#else
	201	#define END_COMPILERRT_FUNCTION(name)
	202	#endif
	203
	204	#endif /* COMPILERRT_ASSEMBLY_H */