Mercurial > pub > dyncall > dyncall
annotate dyncall/dyncall_call_arm32_arm_armhf.S @ 146:0ab08c1541f0
- fixed armhf ellipsis calls, were ignoring spill area
- minor cleanups for consistency
- todo update
author | cslag |
---|---|
date | Thu, 08 Sep 2016 23:00:45 +0200 |
parents | 9bd3c5219505 |
children | 12729fd52ab7 |
rev | line source |
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0 | 1 /* |
2 | |
3 Package: dyncall | |
4 Library: dyncall | |
5 File: dyncall/dyncall_call_arm32_arm_armhf.S | |
6 Description: Call Kernel for ARM 32-bit ARM Architecture - Hard Float | |
7 License: | |
8 | |
146
0ab08c1541f0
- fixed armhf ellipsis calls, were ignoring spill area
cslag
parents:
50
diff
changeset
|
9 Copyright (c) 2007-2016 Daniel Adler <dadler@uni-goettingen.de>, |
0 | 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 .code 32 /* ARM mode */ | |
41 .arch armv6 | |
42 .fpu vfp | |
43 | |
36 | 44 /* |
45 1st arg / r0 = funptr | |
46 2st arg / r1 = ptr to int args | |
47 3st arg / r2 = size | |
48 4st arg / r3 = ptr to float args | |
49 */ | |
0 | 50 GLOBAL_C(dcCall_arm32_armhf) |
51 ENTRY_C(dcCall_arm32_armhf) | |
52 | |
53 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */ | |
54 mov r12 , r13 /* Stack ptr (r13) -> temporary (r12). */ | |
55 stmdb r13!, {r4-r5, r11, r12, r14} /* Permanent registers and stack pointer (now in r12), etc... -> save area on stack (except counter). */ | |
56 | |
57 mov r11 , r12 /* Set frame ptr. */ | |
58 mov r4 , r0 /* r4 = 'fptr' (1st argument is passed in r0). */ | |
59 mov r5 , r1 /* r5 = 'args' (2nd argument is passed in r1). */ | |
60 | |
61 /* Load 16 single-precision registers (= 8 double-precision registers). */ | |
36 | 62 fldmiad r3, {d0-d7} |
0 | 63 |
146
0ab08c1541f0
- fixed armhf ellipsis calls, were ignoring spill area
cslag
parents:
50
diff
changeset
|
64 /* nope, or varargs will not work: sub r2 , r2 , #16 /* skip spill area */ |
0 | 65 cmp r2, #0 |
66 ble armhf_call | |
67 | |
68 sub r13, r13, r2 | |
69 and r13, r13, #-8 /* align 8-byte. */ | |
70 | |
71 mov r3, #0 /* Init byte counter. */ | |
72 add r1 , r1 , #16 | |
73 armhf_pushArgs: | |
74 ldr r0, [r1, +r3] /* Load word into r0. */ | |
75 str r0, [r13, +r3] /* Push word onto stack. */ | |
76 add r3, r3, #4 /* Increment byte counter. */ | |
77 cmp r2, r3 | |
78 bne armhf_pushArgs | |
79 | |
80 armhf_call: | |
81 ldmia r5, {r0-r3} /* Load first 4 arguments for new call into r0-r3. */ | |
82 /* 'blx %r4' workaround for ARMv4t: */ | |
83 mov r14, r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */ | |
84 bx r4 /* Call (ARM/THUMB), available for ARMv4t. */ | |
85 | |
86 /* Epilog. */ | |
87 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? */ | |
88 |