Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/arch/arm/lib/io-writesb.S |
| 4 | * |
| 5 | * Copyright (C) 1995-2000 Russell King |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | */ |
| 7 | #include <linux/linkage.h> |
| 8 | #include <asm/assembler.h> |
| 9 | |
| 10 | .macro outword, rd |
| 11 | #ifndef __ARMEB__ |
| 12 | strb \rd, [r0] |
| 13 | mov \rd, \rd, lsr #8 |
| 14 | strb \rd, [r0] |
| 15 | mov \rd, \rd, lsr #8 |
| 16 | strb \rd, [r0] |
| 17 | mov \rd, \rd, lsr #8 |
| 18 | strb \rd, [r0] |
| 19 | #else |
| 20 | mov lr, \rd, lsr #24 |
| 21 | strb lr, [r0] |
| 22 | mov lr, \rd, lsr #16 |
| 23 | strb lr, [r0] |
| 24 | mov lr, \rd, lsr #8 |
| 25 | strb lr, [r0] |
| 26 | strb \rd, [r0] |
| 27 | #endif |
| 28 | .endm |
| 29 | |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 30 | .Loutsb_align: rsb ip, ip, #4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | cmp ip, r2 |
| 32 | movgt ip, r2 |
| 33 | cmp ip, #2 |
| 34 | ldrb r3, [r1], #1 |
| 35 | strb r3, [r0] |
Stefan Agner | e44fc38 | 2019-02-18 00:57:38 +0100 | [diff] [blame] | 36 | ldrbge r3, [r1], #1 |
| 37 | strbge r3, [r0] |
| 38 | ldrbgt r3, [r1], #1 |
| 39 | strbgt r3, [r0] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | subs r2, r2, ip |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 41 | bne .Loutsb_aligned |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | ENTRY(__raw_writesb) |
| 44 | teq r2, #0 @ do we have to check for the zero len? |
Russell King | 6ebbf2c | 2014-06-30 16:29:12 +0100 | [diff] [blame] | 45 | reteq lr |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | ands ip, r1, #3 |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 47 | bne .Loutsb_align |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 49 | .Loutsb_aligned: |
| 50 | stmfd sp!, {r4, r5, lr} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | subs r2, r2, #16 |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 53 | bmi .Loutsb_no_16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 55 | .Loutsb_16_lp: ldmia r1!, {r3, r4, r5, ip} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | outword r3 |
| 57 | outword r4 |
| 58 | outword r5 |
| 59 | outword ip |
| 60 | subs r2, r2, #16 |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 61 | bpl .Loutsb_16_lp |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | tst r2, #15 |
Stefan Agner | e44fc38 | 2019-02-18 00:57:38 +0100 | [diff] [blame] | 64 | ldmfdeq sp!, {r4, r5, pc} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 66 | .Loutsb_no_16: tst r2, #8 |
| 67 | beq .Loutsb_no_8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | ldmia r1!, {r3, r4} |
| 70 | outword r3 |
| 71 | outword r4 |
| 72 | |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 73 | .Loutsb_no_8: tst r2, #4 |
| 74 | beq .Loutsb_no_4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | ldr r3, [r1], #4 |
| 77 | outword r3 |
| 78 | |
Nicolas Pitre | a9c4814 | 2005-11-11 21:51:48 +0000 | [diff] [blame] | 79 | .Loutsb_no_4: ands r2, r2, #3 |
Stefan Agner | e44fc38 | 2019-02-18 00:57:38 +0100 | [diff] [blame] | 80 | ldmfdeq sp!, {r4, r5, pc} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
| 82 | cmp r2, #2 |
| 83 | ldrb r3, [r1], #1 |
| 84 | strb r3, [r0] |
Stefan Agner | e44fc38 | 2019-02-18 00:57:38 +0100 | [diff] [blame] | 85 | ldrbge r3, [r1], #1 |
| 86 | strbge r3, [r0] |
| 87 | ldrbgt r3, [r1] |
| 88 | strbgt r3, [r0] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Russell King | 1b93a71 | 2006-06-25 11:23:45 +0100 | [diff] [blame] | 90 | ldmfd sp!, {r4, r5, pc} |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 91 | ENDPROC(__raw_writesb) |