Last change
on this file since 519 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.8 KB
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Rev | Line | |
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[444] | 1 | /* Copyright (c) 2017 SiFive Inc. All rights reserved. |
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| 2 | |
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| 3 | This copyrighted material is made available to anyone wishing to use, |
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| 4 | modify, copy, or redistribute it subject to the terms and conditions |
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| 5 | of the FreeBSD License. This program is distributed in the hope that |
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| 6 | it will be useful, but WITHOUT ANY WARRANTY expressed or implied, |
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| 7 | including the implied warranties of MERCHANTABILITY or FITNESS FOR |
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| 8 | A PARTICULAR PURPOSE. A copy of this license is available at |
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| 9 | http://www.opensource.org/licenses. |
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| 10 | */ |
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| 11 | |
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| 12 | .text |
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| 13 | .global memset |
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| 14 | .type memset, @function |
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| 15 | memset: |
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| 16 | li t1, 15 |
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| 17 | move a4, a0 |
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| 18 | bleu a2, t1, .Ltiny |
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| 19 | and a5, a4, 15 |
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| 20 | bnez a5, .Lmisaligned |
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| 21 | |
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| 22 | .Laligned: |
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| 23 | bnez a1, .Lwordify |
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| 24 | |
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| 25 | .Lwordified: |
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| 26 | and a3, a2, ~15 |
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| 27 | and a2, a2, 15 |
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| 28 | add a3, a3, a4 |
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| 29 | |
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| 30 | #if __riscv_xlen == 64 |
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| 31 | 1:sd a1, 0(a4) |
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| 32 | sd a1, 8(a4) |
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| 33 | #else |
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| 34 | 1:sw a1, 0(a4) |
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| 35 | sw a1, 4(a4) |
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| 36 | sw a1, 8(a4) |
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| 37 | sw a1, 12(a4) |
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| 38 | #endif |
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| 39 | add a4, a4, 16 |
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| 40 | bltu a4, a3, 1b |
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| 41 | |
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| 42 | bnez a2, .Ltiny |
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| 43 | ret |
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| 44 | |
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| 45 | .Ltiny: |
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| 46 | sub a3, t1, a2 |
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| 47 | sll a3, a3, 2 |
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| 48 | 1:auipc t0, %pcrel_hi(.Ltable) |
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| 49 | add a3, a3, t0 |
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| 50 | .option push |
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| 51 | .option norvc |
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| 52 | .Ltable_misaligned: |
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| 53 | jr a3, %pcrel_lo(1b) |
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| 54 | .Ltable: |
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| 55 | sb a1,14(a4) |
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| 56 | sb a1,13(a4) |
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| 57 | sb a1,12(a4) |
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| 58 | sb a1,11(a4) |
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| 59 | sb a1,10(a4) |
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| 60 | sb a1, 9(a4) |
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| 61 | sb a1, 8(a4) |
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| 62 | sb a1, 7(a4) |
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| 63 | sb a1, 6(a4) |
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| 64 | sb a1, 5(a4) |
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| 65 | sb a1, 4(a4) |
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| 66 | sb a1, 3(a4) |
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| 67 | sb a1, 2(a4) |
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| 68 | sb a1, 1(a4) |
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| 69 | sb a1, 0(a4) |
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| 70 | .option pop |
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| 71 | ret |
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| 72 | |
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| 73 | .Lwordify: |
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| 74 | and a1, a1, 0xFF |
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| 75 | sll a3, a1, 8 |
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| 76 | or a1, a1, a3 |
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| 77 | sll a3, a1, 16 |
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| 78 | or a1, a1, a3 |
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| 79 | #if __riscv_xlen == 64 |
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| 80 | sll a3, a1, 32 |
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| 81 | or a1, a1, a3 |
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| 82 | #endif |
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| 83 | j .Lwordified |
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| 84 | |
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| 85 | .Lmisaligned: |
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| 86 | sll a3, a5, 2 |
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| 87 | 1:auipc t0, %pcrel_hi(.Ltable_misaligned) |
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| 88 | add a3, a3, t0 |
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| 89 | mv t0, ra |
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| 90 | jalr a3, %pcrel_lo(1b) |
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| 91 | mv ra, t0 |
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| 92 | |
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| 93 | add a5, a5, -16 |
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| 94 | sub a4, a4, a5 |
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| 95 | add a2, a2, a5 |
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| 96 | bleu a2, t1, .Ltiny |
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| 97 | j .Laligned |
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| 98 | .size memset, .-memset |
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