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comparison dyncallback/dyncall_callback_x86.S @ 0:3e629dc19168

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initial from svn dyncall-1745
author Daniel Adler
date Thu, 19 Mar 2015 22:24:28 +0100
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children d0787f3b81fb
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-1:000000000000 0:3e629dc19168
1 /*
2
3 Package: dyncall
4 Library: dyncallback
5 File: dyncallback/dyncall_callback_x86.S
6 Description: Callback Thunk entry for x86
7 License:
8
9 Copyright (c) 2011-2015 Daniel Adler <dadler@uni-goettingen.de>
10
11 Permission to use, copy, modify, and distribute this software for any
12 purpose with or without fee is hereby granted, provided that the above
13 copyright notice and this permission notice appear in all copies.
14
15 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
16 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
17 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
18 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
23 */
24
25
26 #include "../portasm/portasm-x86.S"
27 BEGIN_ASM
28 DCThunk_size = 16
29 DCArgs_size = 20
30 DCValue_size = 8
31
32 CTX_thunk = 0
33 CTX_phandler = 16
34 CTX_pargsvt = 20
35 CTX_stack_cleanup = 24
36 CTX_userdata = 28
37
38 frame_arg0 = 8
39 frame_ret = 4
40 frame_parent = 0
41 frame_CTX = -4
42 frame_DCArgs = -24
43 frame_DCValue = -32
44
45 #define ASCII_L 76
46 #define ASCII_l 108
47 #define ASCII_d 100
48 #define ASCII_f 102
49 #define ASCII_i 105
50 #define ASCII_v 118
51
52 GLOBAL(dcCallbackThunkEntry)
53 BEGIN_PROC(dcCallbackThunkEntry)
54 PUSH(EBP)
55 MOVL(ESP,EBP)
56 /* local variable frame_CTX) */
57 PUSH(EAX) /* EAX = CTX* */
58 /* initialize DCArgs */
59 PUSH(LIT(0)) /* fast_count */
60 PUSH(EDX) /* fast_data[1] */
61 PUSH(ECX) /* fast_data[0] */
62 LEA(DWORD(EBP,frame_arg0),ECX) /* compute arg stack address */
63 PUSH(ECX) /* stack-ptr */
64 PUSH(DWORD(EAX,CTX_pargsvt)) /* vtbl-ptr */
65 MOVL(ESP,ECX) /* ECX = DCArgs* */
66 /* initialize DCvalue */
67 PUSH(LIT(0))
68 PUSH(LIT(0))
69
70 MOVL(ESP,EDX) /* EDX = DCValue* */
71 ANDL(LIT(-16),ESP) /* align stack to 16 bytes. */
72 /* call handler(context) */
73 PUSH(DWORD(EAX,CTX_userdata)) /* userdata */
74 PUSH(EDX) /* DCValue* */
75 PUSH(ECX) /* DCargs* */
76 PUSH(EAX) /* DCCallback* */
77 CALL_DWORD(EAX,CTX_phandler)
78 /* cleanup stack */
79 MOVL(EBP,ESP) /* reset esp to frame */
80 POP(ECX) /* skip parent frame */
81 POP(ECX) /* pop return address */
82 MOVL(DWORD(EBP,frame_CTX),EDX)
83 ADD(DWORD(EDX,CTX_stack_cleanup),ESP) /* cleanup stack */
84 PUSH(ECX) /* push back return address */
85 LEA(DWORD(EBP,frame_DCValue), EDX)
86 MOVL(DWORD(EBP,0), EBP) /* EBP = parent frame */
87 /* handle return value */
88
89 CMP(LIT(ASCII_f),AL)
90 JE(LOCAL(return_f32))
91 CMP(LIT(ASCII_d),AL)
92 JE(LOCAL(return_f64))
93
94 /* All int cases <= 32 bits (+ pointer & string cases) fall in the 32 bits int case*/
95 LOCAL(return_i64):
96 MOVL(DWORD(EDX,0),EAX)
97 MOVL(DWORD(EDX,4),EDX)
98 RET()
99 LOCAL(return_f32):
100 FLDS(DWORD(EDX,0))
101 RET()
102 LOCAL(return_f64):
103 FLDL(QWORD(EDX,0))
104 LOCAL(return_void):
105 RET()
106 END_PROC(dcCallbackThunkEntry)
107 END_ASM
108