1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/*
Package: dyncall
Library: dyncallback
File: dyncallback/dyncall_callback_x64_apple.s
Description: Callback Thunk - Implementation for x64 (Apple as assembly)
License:
Copyright (c) 2007-2011 Daniel Adler <dadler@uni-goettingen.de>,
Tassilo Philipp <tphilipp@potion-studios.com>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
.intel_syntax
.text
/* sizes */
.set DCThunk_size , 24
.set DCArgs_size , 128
.set DCValue_size , 8
/* frame local variable offsets relative to %rbp*/
.set FRAME_arg0 , 16
.set FRAME_return , 8
.set FRAME_parent , 0
.set FRAME_DCArgs ,-128
.set FRAME_DCValue ,-136
/* struct DCCallback */
.set CTX_thunk , 0
.set CTX_handler , 24
.set CTX_userdata , 32
.set DCCallback_size , 40
.globl _dcCallbackThunkEntry
_dcCallbackThunkEntry:
pushq %rbp
movq %rbp, %rsp
// initialize DCArgs
// float parameters (8 registers spill to DCArgs)
sub %rsp, 8*8
movq [%rsp+8*7], %xmm7 # struct offset 120: float parameter 7
movq [%rsp+8*6], %xmm6 # struct offset 112: float parameter 6
movq [%rsp+8*5], %xmm5 # struct offset 104: float parameter 5
movq [%rsp+8*4], %xmm4 # struct offset 96: float parameter 4
movq [%rsp+8*3], %xmm3 # struct offset 88: float parameter 3
movq [%rsp+8*2], %xmm2 # struct offset 80: float parameter 2
movq [%rsp+8*1], %xmm1 # struct offset 72: float parameter 1
movq [%rsp+8*0], %xmm0 # struct offset 64: float parameter 0
// integer parameters (6 registers spill to DCArgs)
pushq %r9 # struct offset 56: parameter 5
pushq %r8 # struct offset 48: parameter 4
pushq %rcx # struct offset 40: parameter 3
pushq %rdx # struct offset 32: parameter 2
pushq %rsi # struct offset 24: parameter 1
pushq %rdi # struct offset 16: parameter 0
// register counts for integer/pointer and float regs
# struct offset 12: fcount
pushq 0 # struct offset 8: icount
lea %rdx, [%rbp+FRAME_arg0] # struct offset 0: stack pointer
pushq %rdx
mov %rsi, %rsp # parameter 1 (RSI) = DCArgs*
// initialize DCValue
pushq 0 # structo offset 0: return value (max long long)
// call handler( *ctx, *args, *value, *userdata)
mov %rdi, %rax # parameter 0 (RDI) = DCCallback* (RAX)
mov %rcx, [%rdi+CTX_userdata] # arg3 = userdata*
mov %rdx, %rsp # arg2 (RDX) = DCValue*
pushq 0 # align to 16 bytes
call [%rax+CTX_handler]
// pass return type via registers
// distinguish two basic classes 'integer' and 'float'
mov %dl, %al
movq %rax, [%rbp+FRAME_DCValue]
ASCII_f = 102
ASCII_d = 100
cmpb %dl, ASCII_f
je .float
cmpb %dl, ASCII_d
jne .return
.float:
movd %xmm0, %rax
.return:
mov %rsp, %rbp
pop %rbp
ret
|
