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comparison dyncall/dyncall_call_arm32_thumb_armhf.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 93f315f02a32
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-1:000000000000 0:3e629dc19168
1 /*
2
3 Package: dyncall
4 Library: dyncall
5 File: dyncall/dyncall_call_arm32_thumb_armhf.S
6 Description: Call Kernel for ARM 32-bit ARM Architecture - Hard Float in Thumb code
7 License:
8
9 Copyright (c) 2007-2015 Daniel Adler <dadler@uni-goettingen.de>,
10 Tassilo Philipp <tphilipp@potion-studios.com>
11
12 Permission to use, copy, modify, and distribute this software for any
13 purpose with or without fee is hereby granted, provided that the above
14 copyright notice and this permission notice appear in all copies.
15
16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
24 */
25
26
27
28 #include "../portasm/portasm-arm.S"
29
30 /* ============================================================================
31 DynCall Call Kernel for ARM 32-bit ARM Architecture Hard-Float
32 ----------------------------------------------------------------------------
33 C Interface:
34 dcCall_arm32_armhf (DCpointer target, DCpointer argv, DCsize size, DCfloat* regdata);
35
36 This Call Kernel was tested on Raspberry Pi/Raspbian (Debian)
37 */
38
39 .text
40 .thumb
41 #ifndef __thumb2__
42 .code 16
43 #endif
44 // .arch armv6
45 // .fpu vfp
46
47 GLOBAL_C(dcCall_arm32_armhf)
48 .thumb_func
49 ENTRY_C(dcCall_arm32_armhf)
50
51 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */
52
53 // mov r12 , r13 /* Stack ptr (r13) -> temporary (r12). */
54 // stmdb r13!, {r4-r5, r11, r12, r14} /* Permanent registers and stack pointer (now in r12), etc... -> save area on stack (except counter). */
55
56 //mov r11 , r12 /* Set frame ptr. */
57
58 push {r4-r7, r14}
59 mov r7 , r13
60
61 mov r4 , r0 /* r4 = 'fptr' (1st argument is passed in r0). */
62 mov r5 , r1 /* r5 = 'args' (2nd argument is passed in r1). */
63
64 /* Load 16 single-precision registers (= 8 double-precision registers). */
65 flds s0, [r3,#0 ]
66 flds s1, [r3,#4 ]
67 flds s2, [r3,#8 ]
68 flds s3, [r3,#12]
69 flds s4, [r3,#16]
70 flds s5, [r3,#20]
71 flds s6, [r3,#24]
72 flds s7, [r3,#28]
73 flds s8, [r3,#32]
74 flds s9, [r3,#36]
75 flds s10, [r3,#40]
76 flds s11, [r3,#44]
77 flds s12, [r3,#48]
78 flds s13, [r3,#52]
79 flds s14, [r3,#56]
80 flds s15, [r3,#60]
81
82 sub r2 , #16
83 cmp r2, #0
84 ble armhf_call
85
86
87 // sub r13, r13, r2
88 // and r13, #-8 /* align 8-byte. */
89
90 mov r6, r13
91 sub r6 , r2
92 // mov r3 , #8
93 // neg r3 , r3
94 // and r6 , r3
95 lsr r6 , #3
96 lsl r6 , #3
97 mov r13, r6
98
99 mov r3, #0 /* Init byte counter. */
100 add r1 , #16
101 armhf_pushArgs:
102 ldr r0, [r1, +r3] /* Load word into r0. */
103 // str r0, [r13, +r3] /* Push word onto stack. */
104 str r0, [r6, +r3] /* Push word onto stack. */
105 add r3, #4 /* Increment byte counter. */
106 cmp r2, r3
107 bne armhf_pushArgs
108
109 armhf_call:
110 ldmia r5!, {r0-r3} /* Load first 4 arguments for new call into r0-r3. */
111 /* 'blx %r4' workaround for ARMv4t: */
112 // mov r14, r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */
113 mov r6, r15
114 add r6, #5
115 mov r14, r6
116 bx r4 /* Call (ARM/THUMB), available for ARMv4t. */
117
118 /* Epilog. */
119 // ldmdb r11, {r4-r5, r11, r13, r15} /* Restore permanent registers (ignore temporary (r12), restore stack ptr and program counter).@@@db not needed since we rewrite r13? */
120 mov r13, r7
121 pop {r4-r7, r15}
122