diff options
Diffstat (limited to 'arch/arm/lib/io-readsb.S')
| -rw-r--r-- | arch/arm/lib/io-readsb.S | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/arch/arm/lib/io-readsb.S b/arch/arm/lib/io-readsb.S new file mode 100644 index 000000000000..081ef749298a --- /dev/null +++ b/arch/arm/lib/io-readsb.S | |||
| @@ -0,0 +1,122 @@ | |||
| 1 | /* | ||
| 2 | * linux/arch/arm/lib/io-readsb.S | ||
| 3 | * | ||
| 4 | * Copyright (C) 1995-2000 Russell King | ||
| 5 | * | ||
| 6 | * This program is free software; you can redistribute it and/or modify | ||
| 7 | * it under the terms of the GNU General Public License version 2 as | ||
| 8 | * published by the Free Software Foundation. | ||
| 9 | */ | ||
| 10 | #include <linux/linkage.h> | ||
| 11 | #include <asm/assembler.h> | ||
| 12 | |||
| 13 | .insb_align: rsb ip, ip, #4 | ||
| 14 | cmp ip, r2 | ||
| 15 | movgt ip, r2 | ||
| 16 | cmp ip, #2 | ||
| 17 | ldrb r3, [r0] | ||
| 18 | strb r3, [r1], #1 | ||
| 19 | ldrgeb r3, [r0] | ||
| 20 | strgeb r3, [r1], #1 | ||
| 21 | ldrgtb r3, [r0] | ||
| 22 | strgtb r3, [r1], #1 | ||
| 23 | subs r2, r2, ip | ||
| 24 | bne .insb_aligned | ||
| 25 | |||
| 26 | ENTRY(__raw_readsb) | ||
| 27 | teq r2, #0 @ do we have to check for the zero len? | ||
| 28 | moveq pc, lr | ||
| 29 | ands ip, r1, #3 | ||
| 30 | bne .insb_align | ||
| 31 | |||
| 32 | .insb_aligned: stmfd sp!, {r4 - r6, lr} | ||
| 33 | |||
| 34 | subs r2, r2, #16 | ||
| 35 | bmi .insb_no_16 | ||
| 36 | |||
| 37 | .insb_16_lp: ldrb r3, [r0] | ||
| 38 | ldrb r4, [r0] | ||
| 39 | ldrb r5, [r0] | ||
| 40 | mov r3, r3, put_byte_0 | ||
| 41 | ldrb r6, [r0] | ||
| 42 | orr r3, r3, r4, put_byte_1 | ||
| 43 | ldrb r4, [r0] | ||
| 44 | orr r3, r3, r5, put_byte_2 | ||
| 45 | ldrb r5, [r0] | ||
| 46 | orr r3, r3, r6, put_byte_3 | ||
| 47 | ldrb r6, [r0] | ||
| 48 | mov r4, r4, put_byte_0 | ||
| 49 | ldrb ip, [r0] | ||
| 50 | orr r4, r4, r5, put_byte_1 | ||
| 51 | ldrb r5, [r0] | ||
| 52 | orr r4, r4, r6, put_byte_2 | ||
| 53 | ldrb r6, [r0] | ||
| 54 | orr r4, r4, ip, put_byte_3 | ||
| 55 | ldrb ip, [r0] | ||
| 56 | mov r5, r5, put_byte_0 | ||
| 57 | ldrb lr, [r0] | ||
| 58 | orr r5, r5, r6, put_byte_1 | ||
| 59 | ldrb r6, [r0] | ||
| 60 | orr r5, r5, ip, put_byte_2 | ||
| 61 | ldrb ip, [r0] | ||
| 62 | orr r5, r5, lr, put_byte_3 | ||
| 63 | ldrb lr, [r0] | ||
| 64 | mov r6, r6, put_byte_0 | ||
| 65 | orr r6, r6, ip, put_byte_1 | ||
| 66 | ldrb ip, [r0] | ||
| 67 | orr r6, r6, lr, put_byte_2 | ||
| 68 | orr r6, r6, ip, put_byte_3 | ||
| 69 | stmia r1!, {r3 - r6} | ||
| 70 | |||
| 71 | subs r2, r2, #16 | ||
| 72 | bpl .insb_16_lp | ||
| 73 | |||
| 74 | tst r2, #15 | ||
| 75 | LOADREGS(eqfd, sp!, {r4 - r6, pc}) | ||
| 76 | |||
| 77 | .insb_no_16: tst r2, #8 | ||
| 78 | beq .insb_no_8 | ||
| 79 | |||
| 80 | ldrb r3, [r0] | ||
| 81 | ldrb r4, [r0] | ||
| 82 | ldrb r5, [r0] | ||
| 83 | mov r3, r3, put_byte_0 | ||
| 84 | ldrb r6, [r0] | ||
| 85 | orr r3, r3, r4, put_byte_1 | ||
| 86 | ldrb r4, [r0] | ||
| 87 | orr r3, r3, r5, put_byte_2 | ||
| 88 | ldrb r5, [r0] | ||
| 89 | orr r3, r3, r6, put_byte_3 | ||
| 90 | ldrb r6, [r0] | ||
| 91 | mov r4, r4, put_byte_0 | ||
| 92 | ldrb ip, [r0] | ||
| 93 | orr r4, r4, r5, put_byte_1 | ||
| 94 | orr r4, r4, r6, put_byte_2 | ||
| 95 | orr r4, r4, ip, put_byte_3 | ||
| 96 | stmia r1!, {r3, r4} | ||
| 97 | |||
| 98 | .insb_no_8: tst r2, #4 | ||
| 99 | beq .insb_no_4 | ||
| 100 | |||
| 101 | ldrb r3, [r0] | ||
| 102 | ldrb r4, [r0] | ||
| 103 | ldrb r5, [r0] | ||
| 104 | ldrb r6, [r0] | ||
| 105 | mov r3, r3, put_byte_0 | ||
| 106 | orr r3, r3, r4, put_byte_1 | ||
| 107 | orr r3, r3, r5, put_byte_2 | ||
| 108 | orr r3, r3, r6, put_byte_3 | ||
| 109 | str r3, [r1], #4 | ||
| 110 | |||
| 111 | .insb_no_4: ands r2, r2, #3 | ||
| 112 | LOADREGS(eqfd, sp!, {r4 - r6, pc}) | ||
| 113 | |||
| 114 | cmp r2, #2 | ||
| 115 | ldrb r3, [r0] | ||
| 116 | strb r3, [r1], #1 | ||
| 117 | ldrgeb r3, [r0] | ||
| 118 | strgeb r3, [r1], #1 | ||
| 119 | ldrgtb r3, [r0] | ||
| 120 | strgtb r3, [r1] | ||
| 121 | |||
| 122 | LOADREGS(fd, sp!, {r4 - r6, pc}) | ||