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