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annotate dyncallback/dyncall_args_mips_o32.c @ 256:7520e2260097

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- added to configure some detection on how to compile .s/.S with --noexecstack (or similar), as compilers' defaults are often insane - since no-execstack handling is now in build, remove .note.GNU-stack section markers (were of limites use, anyways, b/c unportable or implemented inconsistently across platforms) - some ToDo, etc. updates
author Tassilo Philipp
date Sat, 20 May 2017 00:02:59 +0200
parents f0437f85091b
children f5577f6bf97a
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102
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1 /*
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2
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3 Package: dyncall
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4 Library: dyncallback
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5 File: dyncallback/dyncall_args_mips_o32.c
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6 Description: Callback's Arguments VM - Implementation for MIPS o32
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7 License:
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8
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9 Copyright (c) 2013-2015 Daniel Adler <dadler@uni-goettingen.de>,
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10 Tassilo Philipp <tphilipp@potion-studios.com>
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11
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12 Permission to use, copy, modify, and distribute this software for any
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13 purpose with or without fee is hereby granted, provided that the above
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14 copyright notice and this permission notice appear in all copies.
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15
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16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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23
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24 */
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25
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26
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27 #include "dyncall_args_mips.h"
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28
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29 DCint dcbArgInt(DCArgs* p)
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30 {
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31 DCint value;
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32 p->freg_count = 2; /* first int will disable float reg use. */
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33 value = *((int*)p->stackptr);
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34 p->stackptr += sizeof(int);
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35 return value;
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36 }
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37 DCuint dcbArgUInt(DCArgs* p) { return (DCuint)dcbArgInt(p); }
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38
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39 DCulonglong dcbArgULongLong(DCArgs* p)
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40 {
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41 DCulonglong value;
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42 p->stackptr += ((int)p->stackptr & 4); /* Skip one slot if not aligned. */
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43 #if defined(DC__Endian_LITTLE)
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44 value = dcbArgUInt(p);
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45 value |= ((DCulonglong)dcbArgUInt(p)) << 32;
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46 #else
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47 value = ((DCulonglong)dcbArgUInt(p)) << 32;
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48 value |= dcbArgUInt(p);
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49 #endif
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50 return value;
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51 }
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52 DClonglong dcbArgLongLong(DCArgs* p) { return (DClonglong)dcbArgULongLong(p); }
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53
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54 DClong dcbArgLong (DCArgs* p) { return (DClong) dcbArgUInt(p); }
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55 DCulong dcbArgULong (DCArgs* p) { return (DCulong) dcbArgUInt(p); }
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56 DCchar dcbArgChar (DCArgs* p) { return (DCchar) dcbArgUInt(p); }
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57 DCuchar dcbArgUChar (DCArgs* p) { return (DCuchar) dcbArgUInt(p); }
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58 DCshort dcbArgShort (DCArgs* p) { return (DCshort) dcbArgUInt(p); }
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59 DCushort dcbArgUShort (DCArgs* p) { return (DCushort) dcbArgUInt(p); }
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60 DCbool dcbArgBool (DCArgs* p) { return (DCbool) dcbArgUInt(p); }
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61 DCpointer dcbArgPointer(DCArgs* p) { return (DCpointer)dcbArgUInt(p); }
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62
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63 DCfloat dcbArgFloat(DCArgs* p)
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64 {
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65 DCfloat result;
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66 if(p->freg_count < 2) {
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67 /* Stored float regs (max 2) are always 8b aligned. The way we look them up, */
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68 /* relative to a diverging p->stackptr, we need consider this. Only works */
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69 /* with up to two float args, which is all we need. Hacky, but saves us */
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70 /* from one more variable and more bookkeeping in DCArgs. */
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71 result = ((DCfloat*)(p->stackptr + ((int)p->stackptr & 4)) - 4) /* '-4' b/c those regs are stored right before the args */
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72 #if defined(DC__Endian_LITTLE)
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73 [0];
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74 #else
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75 [1];
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76 #endif
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77 ++p->freg_count;
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78 } else {
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79 result = *((DCfloat*)p->stackptr);
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80 }
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81 p->stackptr += sizeof(DCfloat);
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82 return result;
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83 }
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84 DCdouble dcbArgDouble(DCArgs* p)
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85 {
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86 union {
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87 DCdouble result;
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88 DCfloat f[2];
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89 } d;
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90 p->stackptr += ((int)p->stackptr & 4); /* Skip one slot if not aligned. */
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91 if(p->freg_count < 2) {
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92 /*result = *((DCdouble*)p->stackptr-2); this changes the value, slightly*/
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93 d.f[0] = ((DCfloat*)p->stackptr-4)[0]; /* '-4' b/c those regs are stored right before the args */
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94 d.f[1] = ((DCfloat*)p->stackptr-4)[1];
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95 ++p->freg_count;
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96 } else {
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97 /*result = *((DCdouble*)p->stackptr); this changes the value, slightly*/
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98 d.f[0] = ((DCfloat*)p->stackptr)[0];
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99 d.f[1] = ((DCfloat*)p->stackptr)[1];
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100 }
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101 p->stackptr += sizeof(DCdouble);
102
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102 return d.result;
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103 }
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104