asm_support_x86_64.S revision ef7d42fca18c16fbaf103822ad16f23246e2905d 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ART_RUNTIME_ARCH_X86_64_ASM_SUPPORT_X86_64_S_
18#define ART_RUNTIME_ARCH_X86_64_ASM_SUPPORT_X86_64_S_
19
20#include "asm_support_x86_64.h"
21
22#if defined(__APPLE__)
23    // Mac OS' as(1) doesn't let you name macro parameters.
24    #define MACRO0(macro_name) .macro macro_name
25    #define MACRO1(macro_name, macro_arg1) .macro macro_name
26    #define MACRO2(macro_name, macro_arg1, macro_args2) .macro macro_name
27    #define MACRO3(macro_name, macro_arg1, macro_args2, macro_args3) .macro macro_name
28    #define END_MACRO .endmacro
29
30    // Mac OS' as(1) uses $0, $1, and so on for macro arguments, and function names
31    // are mangled with an extra underscore prefix. The use of $x for arguments
32    // mean that literals need to be represented with $$x in macros.
33    #define SYMBOL(name) _ ## name
34    #define PLT_SYMBOL(name) _ ## name
35    #define VAR(name,index) SYMBOL($index)
36    #define PLT_VAR(name, index) SYMBOL($index)
37    #define REG_VAR(name,index) %$index
38    #define CALL_MACRO(name,index) $index
39    #define LITERAL(value) $value
40    #define MACRO_LITERAL(value) $$value
41
42    // Mac OS' doesn't like cfi_* directives
43    #define CFI_STARTPROC
44    #define CFI_ENDPROC
45    #define CFI_ADJUST_CFA_OFFSET(size)
46    #define CFI_DEF_CFA(reg,size)
47    #define CFI_DEF_CFA_REGISTER(reg)
48    #define CFI_RESTORE(reg)
49    #define CFI_REL_OFFSET(reg,size)
50
51    // Mac OS' doesn't support certain directives
52    #define FUNCTION_TYPE(name)
53    #define SIZE(name)
54#else
55    // Regular gas(1) lets you name macro parameters.
56    #define MACRO0(macro_name) .macro macro_name
57    #define MACRO1(macro_name, macro_arg1) .macro macro_name macro_arg1
58    #define MACRO2(macro_name, macro_arg1, macro_arg2) .macro macro_name macro_arg1, macro_arg2
59    #define MACRO3(macro_name, macro_arg1, macro_arg2, macro_arg3) .macro macro_name macro_arg1, macro_arg2, macro_arg3
60    #define END_MACRO .endm
61
62    // Regular gas(1) uses \argument_name for macro arguments.
63    // We need to turn on alternate macro syntax so we can use & instead or the preprocessor
64    // will screw us by inserting a space between the \ and the name. Even in this mode there's
65    // no special meaning to $, so literals are still just $x. The use of altmacro means % is a
66    // special character meaning care needs to be taken when passing registers as macro arguments.
67    .altmacro
68    #define SYMBOL(name) name
69    #define PLT_SYMBOL(name) name@PLT
70    #define VAR(name,index) name&
71    #define PLT_VAR(name, index) name&@PLT
72    #define REG_VAR(name,index) %name
73    #define CALL_MACRO(name,index) name&
74    #define LITERAL(value) $value
75    #define MACRO_LITERAL(value) $value
76
77    // CFI support
78    #define CFI_STARTPROC .cfi_startproc
79    #define CFI_ENDPROC .cfi_endproc
80    #define CFI_ADJUST_CFA_OFFSET(size) .cfi_adjust_cfa_offset size
81    #define CFI_DEF_CFA(reg,size) .cfi_def_cfa reg,size
82    #define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg
83    #define CFI_RESTORE(reg) .cfi_restore reg
84    #define CFI_REL_OFFSET(reg,size) .cfi_rel_offset reg,size
85
86    #define FUNCTION_TYPE(name) .type name&, @function
87    #define SIZE(name) .size name, .-name
88#endif
89
90    /* Cache alignment for function entry */
91MACRO0(ALIGN_FUNCTION_ENTRY)
92    .balign 16
93END_MACRO
94
95MACRO1(DEFINE_FUNCTION, c_name)
96    FUNCTION_TYPE(\c_name)
97    .globl VAR(c_name, 0)
98    ALIGN_FUNCTION_ENTRY
99VAR(c_name, 0):
100    CFI_STARTPROC
101END_MACRO
102
103MACRO1(END_FUNCTION, c_name)
104    CFI_ENDPROC
105    SIZE(\c_name)
106END_MACRO
107
108MACRO1(PUSH, reg)
109    pushq REG_VAR(reg, 0)
110    CFI_ADJUST_CFA_OFFSET(8)
111    CFI_REL_OFFSET(REG_VAR(reg, 0), 0)
112END_MACRO
113
114MACRO1(POP, reg)
115    popq REG_VAR(reg,0)
116    CFI_ADJUST_CFA_OFFSET(-8)
117    CFI_RESTORE(REG_VAR(reg,0))
118END_MACRO
119
120MACRO1(UNIMPLEMENTED,name)
121    FUNCTION_TYPE(\name)
122    .globl VAR(name, 0)
123    ALIGN_FUNCTION_ENTRY
124VAR(name, 0):
125    CFI_STARTPROC
126    int3
127    int3
128    CFI_ENDPROC
129    SIZE(\name)
130END_MACRO
131
132MACRO0(SETUP_GOT_NOSAVE)
133    call __x86.get_pc_thunk.bx
134    addl $_GLOBAL_OFFSET_TABLE_, %ebx
135END_MACRO
136
137MACRO0(SETUP_GOT)
138    PUSH  ebx
139    SETUP_GOT_NOSAVE
140END_MACRO
141
142MACRO0(UNDO_SETUP_GOT)
143    POP  ebx
144END_MACRO
145
146#endif  // ART_RUNTIME_ARCH_X86_64_ASM_SUPPORT_X86_64_S_
147