| /* |
| * linux/arch/arm/lib/io-readsw-armv4.S |
| * |
| * Copyright (C) 1995-2000 Russell King |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| |
| .macro pack, rd, hw1, hw2 |
| #ifndef __ARMEB__ |
| orr \rd, \hw1, \hw2, lsl #16 |
| #else |
| orr \rd, \hw2, \hw1, lsl #16 |
| #endif |
| .endm |
| |
| .Linsw_align: movs ip, r1, lsl #31 |
| bne .Linsw_noalign |
| ldrh ip, [r0] |
| sub r2, r2, #1 |
| strh ip, [r1], #2 |
| |
| ENTRY(__raw_readsw) |
| teq r2, #0 |
| reteq lr |
| tst r1, #3 |
| bne .Linsw_align |
| |
| stmfd sp!, {r4, r5, lr} |
| |
| subs r2, r2, #8 |
| bmi .Lno_insw_8 |
| |
| .Linsw_8_lp: ldrh r3, [r0] |
| ldrh r4, [r0] |
| pack r3, r3, r4 |
| |
| ldrh r4, [r0] |
| ldrh r5, [r0] |
| pack r4, r4, r5 |
| |
| ldrh r5, [r0] |
| ldrh ip, [r0] |
| pack r5, r5, ip |
| |
| ldrh ip, [r0] |
| ldrh lr, [r0] |
| pack ip, ip, lr |
| |
| subs r2, r2, #8 |
| stmia r1!, {r3 - r5, ip} |
| bpl .Linsw_8_lp |
| |
| .Lno_insw_8: tst r2, #4 |
| beq .Lno_insw_4 |
| |
| ldrh r3, [r0] |
| ldrh r4, [r0] |
| pack r3, r3, r4 |
| |
| ldrh r4, [r0] |
| ldrh ip, [r0] |
| pack r4, r4, ip |
| |
| stmia r1!, {r3, r4} |
| |
| .Lno_insw_4: movs r2, r2, lsl #31 |
| bcc .Lno_insw_2 |
| |
| ldrh r3, [r0] |
| ldrh ip, [r0] |
| pack r3, r3, ip |
| str r3, [r1], #4 |
| |
| .Lno_insw_2: ldrneh r3, [r0] |
| strneh r3, [r1] |
| |
| ldmfd sp!, {r4, r5, pc} |
| |
| #ifdef __ARMEB__ |
| #define _BE_ONLY_(code...) code |
| #define _LE_ONLY_(code...) |
| #define push_hbyte0 lsr #8 |
| #define pull_hbyte1 lsl #24 |
| #else |
| #define _BE_ONLY_(code...) |
| #define _LE_ONLY_(code...) code |
| #define push_hbyte0 lsl #24 |
| #define pull_hbyte1 lsr #8 |
| #endif |
| |
| .Linsw_noalign: stmfd sp!, {r4, lr} |
| ldrccb ip, [r1, #-1]! |
| bcc 1f |
| |
| ldrh ip, [r0] |
| sub r2, r2, #1 |
| _BE_ONLY_( mov ip, ip, ror #8 ) |
| strb ip, [r1], #1 |
| _LE_ONLY_( mov ip, ip, lsr #8 ) |
| _BE_ONLY_( mov ip, ip, lsr #24 ) |
| |
| 1: subs r2, r2, #2 |
| bmi 3f |
| _BE_ONLY_( mov ip, ip, lsl #24 ) |
| |
| 2: ldrh r3, [r0] |
| ldrh r4, [r0] |
| subs r2, r2, #2 |
| orr ip, ip, r3, lsl #8 |
| orr ip, ip, r4, push_hbyte0 |
| str ip, [r1], #4 |
| mov ip, r4, pull_hbyte1 |
| bpl 2b |
| |
| _BE_ONLY_( mov ip, ip, lsr #24 ) |
| |
| 3: tst r2, #1 |
| strb ip, [r1], #1 |
| ldrneh ip, [r0] |
| _BE_ONLY_( movne ip, ip, ror #8 ) |
| strneb ip, [r1], #1 |
| _LE_ONLY_( movne ip, ip, lsr #8 ) |
| _BE_ONLY_( movne ip, ip, lsr #24 ) |
| strneb ip, [r1] |
| ldmfd sp!, {r4, pc} |
| ENDPROC(__raw_readsw) |