Mercurial > pub > dyncall > dyncall

annotate dyncallback/dyncall_callback_riscv64.S @ 653:0c8838766866

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- riscv64 support for calls and callbacks (but lacking aggr and syscall support) - thanks Jun Jeon! :) - mark riscv64 as implemented in manual overview
author Tassilo Philipp
date Thu, 07 Mar 2024 17:42:13 +0100 (17 months ago)
parents
children b8969b7b4876
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653
0c8838766866 - riscv64 support for calls and callbacks (but lacking aggr and syscall support) - thanks Jun Jeon! :)
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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_callback_riscv64.S
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6 Description: Callback Thunk - Implementation for RISCV64
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7 License:
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8
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9 Copyright (c) 2023 Jun Jeon <yjeon@netflix.com>
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10
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11 Permission to use, copy, modify, and distribute this software for any
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12 purpose with or without fee is hereby granted, provided that the above
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13 copyright notice and this permission notice appear in all copies.
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14
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15 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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16 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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17 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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18 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 */
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24
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25 /* struct DCCallback
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26 type off size
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27 ---------|------|------
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28 DCThunk | 0 | 32
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29 handler | 32 | 8
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30 userdata | 40 | 8
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31 */
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32
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33 .align 4
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34 .globl dcCallbackThunkEntry
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35 dcCallbackThunkEntry:
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36
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37 /* called from dcbInitThunk() in dyncall_thunk_riscv64.c */
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38
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39 /* input:
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40 t5: DCCallback* pcb
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41 a0..a7 ?? GP regs
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42 fa0..fa7 ?? FP/SIMD regs
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43 sp... ?? arguments on stack
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44
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45 locals:
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46 type off size
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47 ---------|------|------
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48 Frame 0 16
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49 DCArgs 16 144
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50 DCValue 160 16
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51
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52 size 176
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53 aligned 176
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54
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55 ra - ret addr
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56 s0/fp - frame ptr
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57
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58 locals:
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59 t0: orig sp
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60 t1: DCArgs* args
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61 */
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62
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63 mv t0, sp
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64
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65 add sp, sp, -176
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66
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67 /* save ra and s0 */
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68 sd ra, 0(sp)
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69 sd s0, 8(sp)
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70
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71 /* save frame ptr */
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72 mv s0, sp
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73
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74 add t1, s0, 16
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75
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76 /* just saving everything on stack, as defined in DCArgs in dyncall_args_riscv64.c */
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77
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78 /* save regs */
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79
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80 sd a0, 0(t1)
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81 sd a1, 8(t1)
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82 sd a2, 16(t1)
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83 sd a3, 24(t1)
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84 sd a4, 32(t1)
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85 sd a5, 40(t1)
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86 sd a6, 48(t1)
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87 sd a7, 56(t1)
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88
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89 fsd fa0, 64(t1)
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90 fsd fa1, 72(t1)
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91 fsd fa2, 80(t1)
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92 fsd fa3, 88(t1)
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93 fsd fa4, 96(t1)
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94 fsd fa5, 104(t1)
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95 fsd fa6, 112(t1)
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96 fsd fa7, 120(t1)
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97
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98 sd t0, 128(t1) /* sp=sp */
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99 sd zero, 136(t1) /* i=f=0 */
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100
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101 /* call handler/callback */
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102
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103 mv a0, t5 /* DCCallback* pcb */
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104 add a1, s0, 16 /* DCArgs* args */
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105 add a2, s0, 160 /* DCValue* result */
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106 ld a3, 40(t5) /* void* userdata */
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107
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108 ld t2, 32(t5)
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109 jalr ra, 0(t2)
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110
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111 and t3, a0, 255
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112 add t4, zero, 'f' /* single precition floats are sign extended on */
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113 beq t3, t4, .retf /* riscv with the D extension, handle specifically */
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114 add t4, zero, 'd'
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115 beq t3, t4, .retd
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116
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117 .reti:
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118 ld a0, 160(s0)
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119 j .ret
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120 .retf:
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121 flw fa0, 160(s0)
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122 j .ret
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123 .retd:
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124 fld fa0, 160(s0)
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125 .ret:
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126 /* recover ra and s0 */
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127 ld ra, 0(sp)
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128 ld s0, 8(sp)
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129
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130 add sp, sp, 176
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131 ret
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132