diff options
Diffstat (limited to 'arch/arm/lib/findbit.S')
| -rw-r--r-- | arch/arm/lib/findbit.S | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/arch/arm/lib/findbit.S b/arch/arm/lib/findbit.S index 8c4defc4f3c4..1e4cbd4e7be9 100644 --- a/arch/arm/lib/findbit.S +++ b/arch/arm/lib/findbit.S | |||
| @@ -25,7 +25,10 @@ ENTRY(_find_first_zero_bit_le) | |||
| 25 | teq r1, #0 | 25 | teq r1, #0 |
| 26 | beq 3f | 26 | beq 3f |
| 27 | mov r2, #0 | 27 | mov r2, #0 |
| 28 | 1: ldrb r3, [r0, r2, lsr #3] | 28 | 1: |
| 29 | ARM( ldrb r3, [r0, r2, lsr #3] ) | ||
| 30 | THUMB( lsr r3, r2, #3 ) | ||
| 31 | THUMB( ldrb r3, [r0, r3] ) | ||
| 29 | eors r3, r3, #0xff @ invert bits | 32 | eors r3, r3, #0xff @ invert bits |
| 30 | bne .L_found @ any now set - found zero bit | 33 | bne .L_found @ any now set - found zero bit |
| 31 | add r2, r2, #8 @ next bit pointer | 34 | add r2, r2, #8 @ next bit pointer |
| @@ -44,7 +47,9 @@ ENTRY(_find_next_zero_bit_le) | |||
| 44 | beq 3b | 47 | beq 3b |
| 45 | ands ip, r2, #7 | 48 | ands ip, r2, #7 |
| 46 | beq 1b @ If new byte, goto old routine | 49 | beq 1b @ If new byte, goto old routine |
| 47 | ldrb r3, [r0, r2, lsr #3] | 50 | ARM( ldrb r3, [r0, r2, lsr #3] ) |
| 51 | THUMB( lsr r3, r2, #3 ) | ||
| 52 | THUMB( ldrb r3, [r0, r3] ) | ||
| 48 | eor r3, r3, #0xff @ now looking for a 1 bit | 53 | eor r3, r3, #0xff @ now looking for a 1 bit |
| 49 | movs r3, r3, lsr ip @ shift off unused bits | 54 | movs r3, r3, lsr ip @ shift off unused bits |
| 50 | bne .L_found | 55 | bne .L_found |
| @@ -61,7 +66,10 @@ ENTRY(_find_first_bit_le) | |||
| 61 | teq r1, #0 | 66 | teq r1, #0 |
| 62 | beq 3f | 67 | beq 3f |
| 63 | mov r2, #0 | 68 | mov r2, #0 |
| 64 | 1: ldrb r3, [r0, r2, lsr #3] | 69 | 1: |
| 70 | ARM( ldrb r3, [r0, r2, lsr #3] ) | ||
| 71 | THUMB( lsr r3, r2, #3 ) | ||
| 72 | THUMB( ldrb r3, [r0, r3] ) | ||
| 65 | movs r3, r3 | 73 | movs r3, r3 |
| 66 | bne .L_found @ any now set - found zero bit | 74 | bne .L_found @ any now set - found zero bit |
| 67 | add r2, r2, #8 @ next bit pointer | 75 | add r2, r2, #8 @ next bit pointer |
| @@ -80,7 +88,9 @@ ENTRY(_find_next_bit_le) | |||
| 80 | beq 3b | 88 | beq 3b |
| 81 | ands ip, r2, #7 | 89 | ands ip, r2, #7 |
| 82 | beq 1b @ If new byte, goto old routine | 90 | beq 1b @ If new byte, goto old routine |
| 83 | ldrb r3, [r0, r2, lsr #3] | 91 | ARM( ldrb r3, [r0, r2, lsr #3] ) |
| 92 | THUMB( lsr r3, r2, #3 ) | ||
| 93 | THUMB( ldrb r3, [r0, r3] ) | ||
| 84 | movs r3, r3, lsr ip @ shift off unused bits | 94 | movs r3, r3, lsr ip @ shift off unused bits |
| 85 | bne .L_found | 95 | bne .L_found |
| 86 | orr r2, r2, #7 @ if zero, then no bits here | 96 | orr r2, r2, #7 @ if zero, then no bits here |
| @@ -95,7 +105,9 @@ ENTRY(_find_first_zero_bit_be) | |||
| 95 | beq 3f | 105 | beq 3f |
| 96 | mov r2, #0 | 106 | mov r2, #0 |
| 97 | 1: eor r3, r2, #0x18 @ big endian byte ordering | 107 | 1: eor r3, r2, #0x18 @ big endian byte ordering |
| 98 | ldrb r3, [r0, r3, lsr #3] | 108 | ARM( ldrb r3, [r0, r3, lsr #3] ) |
| 109 | THUMB( lsr r3, #3 ) | ||
| 110 | THUMB( ldrb r3, [r0, r3] ) | ||
| 99 | eors r3, r3, #0xff @ invert bits | 111 | eors r3, r3, #0xff @ invert bits |
| 100 | bne .L_found @ any now set - found zero bit | 112 | bne .L_found @ any now set - found zero bit |
| 101 | add r2, r2, #8 @ next bit pointer | 113 | add r2, r2, #8 @ next bit pointer |
| @@ -111,7 +123,9 @@ ENTRY(_find_next_zero_bit_be) | |||
| 111 | ands ip, r2, #7 | 123 | ands ip, r2, #7 |
| 112 | beq 1b @ If new byte, goto old routine | 124 | beq 1b @ If new byte, goto old routine |
| 113 | eor r3, r2, #0x18 @ big endian byte ordering | 125 | eor r3, r2, #0x18 @ big endian byte ordering |
| 114 | ldrb r3, [r0, r3, lsr #3] | 126 | ARM( ldrb r3, [r0, r3, lsr #3] ) |
| 127 | THUMB( lsr r3, #3 ) | ||
| 128 | THUMB( ldrb r3, [r0, r3] ) | ||
| 115 | eor r3, r3, #0xff @ now looking for a 1 bit | 129 | eor r3, r3, #0xff @ now looking for a 1 bit |
| 116 | movs r3, r3, lsr ip @ shift off unused bits | 130 | movs r3, r3, lsr ip @ shift off unused bits |
| 117 | bne .L_found | 131 | bne .L_found |
| @@ -125,7 +139,9 @@ ENTRY(_find_first_bit_be) | |||
| 125 | beq 3f | 139 | beq 3f |
| 126 | mov r2, #0 | 140 | mov r2, #0 |
| 127 | 1: eor r3, r2, #0x18 @ big endian byte ordering | 141 | 1: eor r3, r2, #0x18 @ big endian byte ordering |
| 128 | ldrb r3, [r0, r3, lsr #3] | 142 | ARM( ldrb r3, [r0, r3, lsr #3] ) |
| 143 | THUMB( lsr r3, #3 ) | ||
| 144 | THUMB( ldrb r3, [r0, r3] ) | ||
| 129 | movs r3, r3 | 145 | movs r3, r3 |
| 130 | bne .L_found @ any now set - found zero bit | 146 | bne .L_found @ any now set - found zero bit |
| 131 | add r2, r2, #8 @ next bit pointer | 147 | add r2, r2, #8 @ next bit pointer |
| @@ -141,7 +157,9 @@ ENTRY(_find_next_bit_be) | |||
| 141 | ands ip, r2, #7 | 157 | ands ip, r2, #7 |
| 142 | beq 1b @ If new byte, goto old routine | 158 | beq 1b @ If new byte, goto old routine |
| 143 | eor r3, r2, #0x18 @ big endian byte ordering | 159 | eor r3, r2, #0x18 @ big endian byte ordering |
| 144 | ldrb r3, [r0, r3, lsr #3] | 160 | ARM( ldrb r3, [r0, r3, lsr #3] ) |
| 161 | THUMB( lsr r3, #3 ) | ||
| 162 | THUMB( ldrb r3, [r0, r3] ) | ||
| 145 | movs r3, r3, lsr ip @ shift off unused bits | 163 | movs r3, r3, lsr ip @ shift off unused bits |
| 146 | bne .L_found | 164 | bne .L_found |
| 147 | orr r2, r2, #7 @ if zero, then no bits here | 165 | orr r2, r2, #7 @ if zero, then no bits here |