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1 /*
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2
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3 Package: dyncall
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4 Library: dyncall
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5 File: dyncall/dyncall_call_arm32_thumb_armhf.S
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6 Description: Call Kernel for ARM 32-bit ARM Architecture - Hard Float in Thumb code
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7 License:
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8
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9 Copyright (c) 2007-2015 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
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28 #include "../portasm/portasm-arm.S"
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29
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30 /* ============================================================================
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31 DynCall Call Kernel for ARM 32-bit ARM Architecture Hard-Float
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32 ----------------------------------------------------------------------------
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33 C Interface:
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34 dcCall_arm32_armhf (DCpointer target, DCpointer argv, DCsize size, DCfloat* regdata);
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35
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36 This Call Kernel was tested on Raspberry Pi/Raspbian (Debian)
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37 */
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38
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39 .text
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40 .thumb
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41 #ifndef __thumb2__
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42 .code 16
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43 #endif
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44 // .arch armv6
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45 // .fpu vfp
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46
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47 GLOBAL_C(dcCall_arm32_armhf)
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48 .thumb_func
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49 ENTRY_C(dcCall_arm32_armhf)
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50
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51 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */
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52
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53 // mov r12 , r13 /* Stack ptr (r13) -> temporary (r12). */
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54 // stmdb r13!, {r4-r5, r11, r12, r14} /* Permanent registers and stack pointer (now in r12), etc... -> save area on stack (except counter). */
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55
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56 //mov r11 , r12 /* Set frame ptr. */
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57
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58 push {r4-r7, r14}
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59 mov r7 , r13
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60
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61 mov r4 , r0 /* r4 = 'fptr' (1st argument is passed in r0). */
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62 mov r5 , r1 /* r5 = 'args' (2nd argument is passed in r1). */
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63
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64 /* Load 16 single-precision registers (= 8 double-precision registers). */
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65 flds s0, [r3,#0 ]
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66 flds s1, [r3,#4 ]
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67 flds s2, [r3,#8 ]
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68 flds s3, [r3,#12]
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69 flds s4, [r3,#16]
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70 flds s5, [r3,#20]
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71 flds s6, [r3,#24]
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72 flds s7, [r3,#28]
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73 flds s8, [r3,#32]
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74 flds s9, [r3,#36]
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75 flds s10, [r3,#40]
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76 flds s11, [r3,#44]
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77 flds s12, [r3,#48]
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78 flds s13, [r3,#52]
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79 flds s14, [r3,#56]
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80 flds s15, [r3,#60]
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81
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82 sub r2 , #16
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83 cmp r2, #0
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84 ble armhf_call
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85
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86
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87 // sub r13, r13, r2
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88 // and r13, #-8 /* align 8-byte. */
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89
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90 mov r6, r13
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91 sub r6 , r2
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92 // mov r3 , #8
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93 // neg r3 , r3
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94 // and r6 , r3
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95 lsr r6 , #3
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96 lsl r6 , #3
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97 mov r13, r6
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98
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99 mov r3, #0 /* Init byte counter. */
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100 add r1 , #16
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101 armhf_pushArgs:
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102 ldr r0, [r1, +r3] /* Load word into r0. */
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103 // str r0, [r13, +r3] /* Push word onto stack. */
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104 str r0, [r6, +r3] /* Push word onto stack. */
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105 add r3, #4 /* Increment byte counter. */
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106 cmp r2, r3
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107 bne armhf_pushArgs
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108
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109 armhf_call:
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110 ldmia r5!, {r0-r3} /* Load first 4 arguments for new call into r0-r3. */
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111 /* 'blx %r4' workaround for ARMv4t: */
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112 // mov r14, r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */
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113 mov r6, r15
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114 add r6, #5
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115 mov r14, r6
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116 bx r4 /* Call (ARM/THUMB), available for ARMv4t. */
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117
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118 /* Epilog. */
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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? */
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120 mov r13, r7
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121 pop {r4-r7, r15}
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122
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