[258] | 1 | /****************************************************************************** |
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[709] | 2 | * This function receives two arguments that are the current thread context |
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| 3 | * (virtual) addresses and the next thread context (virtual) address. |
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[263] | 4 | * |
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[301] | 5 | * This function should be called in a critical section |
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| 6 | * |
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[263] | 7 | * TODO (AG) Il semble possible de limiter le nombre de registres à sauver: |
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| 8 | * - s0 Ã s8 ($16 Ã $23 + $30) |
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| 9 | * - sp ($29) |
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| 10 | * - ra ($31) |
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| 11 | * - hi et lo |
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| 12 | * - sr |
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| 13 | * - epc |
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| 14 | * - ptpr |
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[258] | 15 | ******************************************************************************/ |
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| 16 | |
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[709] | 17 | .globl _thread_switch |
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| 18 | .func _thread_switch |
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| 19 | .type _thread_switch, %function |
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[258] | 20 | |
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[709] | 21 | _thread_switch: |
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[258] | 22 | |
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[709] | 23 | /* first step : save current thread context */ |
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| 24 | add $27, $4, $0 /* $27 <= &context[current] */ |
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[258] | 25 | |
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| 26 | .set noat |
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| 27 | sw $1, 1*4($27) /* ctx[1] <= $1 */ |
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| 28 | .set at |
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| 29 | sw $2, 2*4($27) /* ctx[2] <= $2 */ |
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| 30 | sw $3, 3*4($27) /* ctx[3] <= $3 */ |
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| 31 | sw $4, 4*4($27) /* ctx[4] <= $4 */ |
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| 32 | sw $5, 5*4($27) /* ctx[5] <= $5 */ |
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| 33 | sw $6, 6*4($27) /* ctx[6] <= $6 */ |
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| 34 | sw $7, 7*4($27) /* ctx[7] <= $7 */ |
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| 35 | sw $8, 8*4($27) /* ctx[8] <= $8 */ |
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| 36 | sw $9, 9*4($27) /* ctx[9] <= $9 */ |
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| 37 | sw $10, 10*4($27) /* ctx[10] <= $10 */ |
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| 38 | sw $11, 11*4($27) /* ctx[11] <= $11 */ |
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| 39 | sw $12, 12*4($27) /* ctx[12] <= $12 */ |
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| 40 | sw $13, 13*4($27) /* ctx[13] <= $13 */ |
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| 41 | sw $14, 14*4($27) /* ctx[14] <= $14 */ |
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| 42 | sw $15, 15*4($27) /* ctx[15] <= $15 */ |
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| 43 | sw $16, 16*4($27) /* ctx[16] <= $16 */ |
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| 44 | sw $17, 17*4($27) /* ctx[17] <= $17 */ |
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| 45 | sw $18, 18*4($27) /* ctx[18] <= $18 */ |
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| 46 | sw $19, 19*4($27) /* ctx[19] <= $19 */ |
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| 47 | sw $20, 20*4($27) /* ctx[20] <= $20 */ |
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| 48 | sw $21, 21*4($27) /* ctx[21] <= $21 */ |
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| 49 | sw $22, 22*4($27) /* ctx[22] <= $22 */ |
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| 50 | sw $23, 23*4($27) /* ctx[23] <= $23 */ |
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| 51 | sw $24, 24*4($27) /* ctx[24] <= $24 */ |
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| 52 | sw $25, 25*4($27) /* ctx[25] <= $25 */ |
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| 53 | mflo $26 |
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| 54 | sw $26, 26*4($27) /* ctx[26] <= LO */ |
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| 55 | mfhi $26 |
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| 56 | sw $26, 27*4($27) /* ctx[27] <= H1 */ |
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| 57 | sw $28, 28*4($27) /* ctx[28] <= $28 */ |
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| 58 | sw $29, 29*4($27) /* ctx[29] <= $29 */ |
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| 59 | sw $30, 30*4($27) /* ctx[30] <= $30 */ |
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| 60 | sw $31, 31*4($27) /* ctx[31] <= $31 */ |
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| 61 | mfc0 $26, $14 |
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| 62 | sw $26, 32*4($27) /* ctx[32] <= EPC */ |
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| 63 | mfc0 $26, $13 |
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| 64 | sw $26, 33*4($27) /* ctx[33] <= CR */ |
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| 65 | mfc0 $26, $12 |
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| 66 | sw $26, 34*4($27) /* ctx[34] <= SR */ |
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| 67 | mfc0 $26, $8 |
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| 68 | sw $26, 35*4($27) /* ctx[34] <= BVAR */ |
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| 69 | mfc2 $26, $0 |
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| 70 | sw $26, 39*4($27) /* ctx[35] <= PTPR */ |
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| 71 | |
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[709] | 72 | /* second step : restore next thread context */ |
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| 73 | add $27, $5, $0 /* $27<= &context[next] */ |
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[258] | 74 | |
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| 75 | .set noat |
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| 76 | lw $1, 1*4($27) /* restore $1 */ |
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| 77 | .set at |
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| 78 | lw $2, 2*4($27) /* restore $2 */ |
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| 79 | lw $3, 3*4($27) /* restore $3 */ |
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| 80 | lw $4, 4*4($27) /* restore $4 */ |
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| 81 | lw $5, 5*4($27) /* restore $5 */ |
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| 82 | lw $6, 6*4($27) /* restore $6 */ |
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| 83 | lw $7, 7*4($27) /* restore $7 */ |
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| 84 | lw $8, 8*4($27) /* restore $8 */ |
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| 85 | lw $9, 9*4($27) /* restore $9 */ |
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| 86 | lw $10, 10*4($27) /* restore $10 */ |
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| 87 | lw $11, 11*4($27) /* restore $11 */ |
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| 88 | lw $12, 12*4($27) /* restore $12 */ |
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| 89 | lw $13, 13*4($27) /* restore $13 */ |
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| 90 | lw $14, 14*4($27) /* restore $14 */ |
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| 91 | lw $15, 15*4($27) /* restore $15 */ |
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| 92 | lw $16, 16*4($27) /* restore $16 */ |
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| 93 | lw $17, 17*4($27) /* restore $17 */ |
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| 94 | lw $18, 18*4($27) /* restore $18 */ |
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| 95 | lw $19, 19*4($27) /* restore $19 */ |
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| 96 | lw $20, 20*4($27) /* restore $20 */ |
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| 97 | lw $21, 21*4($27) /* restore $21 */ |
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| 98 | lw $22, 22*4($27) /* restore $22 */ |
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| 99 | lw $23, 23*4($27) /* restore $23 */ |
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| 100 | lw $24, 24*4($27) /* restore $24 */ |
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| 101 | lw $25, 25*4($27) /* restore $25 */ |
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| 102 | lw $26, 26*4($27) |
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| 103 | mtlo $26 /* restore LO */ |
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| 104 | lw $26, 27*4($27) |
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| 105 | mthi $26 /* restore HI */ |
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| 106 | lw $28, 28*4($27) /* restore $28 */ |
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| 107 | lw $29, 29*4($27) /* restore $29 */ |
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| 108 | lw $30, 30*4($27) /* restore $30 */ |
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| 109 | lw $31, 31*4($27) /* restore $31 */ |
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| 110 | lw $26, 32*4($27) |
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| 111 | mtc0 $26, $14 /* restore EPC */ |
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| 112 | lw $26, 33*4($27) |
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| 113 | mtc0 $26, $13 /* restore CR */ |
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| 114 | lw $26, 34*4($27) |
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| 115 | mtc0 $26, $12 /* restore SR */ |
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| 116 | lw $26, 35*4($27) |
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| 117 | mtc0 $26, $8 /* restore BVAR */ |
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| 118 | lw $26, 39*4($27) |
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| 119 | mtc2 $26, $0 /* restore PTPR */ |
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| 120 | |
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| 121 | /* returns to caller */ |
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| 122 | jr $31 |
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| 123 | |
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| 124 | .endfunc |
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[709] | 125 | .size _thread_switch, .-_thread_switch |
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[258] | 126 | |
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