projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 88278ca2 | 1 | /* |
| 1da177e4 LT |
2 | * Assembly part of rw semaphores. |
| 3 | * | |
| 4 | * Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com) | |
| 5 | */ | |
| 6 | ||
| 1da177e4 LT |
7 | #include <asm/ptrace.h> |
| 8 | #include <asm/psr.h> | |
| 9 | ||
| c6d64c16 | 10 | .section .sched.text, "ax" |
| 1da177e4 LT |
11 | .align 4 |
| 12 | ||
| 13 | .globl ___down_read | |
| 14 | ___down_read: | |
| 15 | rd %psr, %g3 | |
| 16 | nop | |
| 17 | nop | |
| 18 | nop | |
| 19 | or %g3, PSR_PIL, %g7 | |
| 20 | wr %g7, 0, %psr | |
| 21 | nop | |
| 22 | nop | |
| 23 | nop | |
| 24 | #ifdef CONFIG_SMP | |
| 25 | 1: ldstub [%g1 + 4], %g7 | |
| 26 | tst %g7 | |
| 27 | bne 1b | |
| 28 | ld [%g1], %g7 | |
| 29 | sub %g7, 1, %g7 | |
| 30 | st %g7, [%g1] | |
| 31 | stb %g0, [%g1 + 4] | |
| 32 | #else | |
| 33 | ld [%g1], %g7 | |
| 34 | sub %g7, 1, %g7 | |
| 35 | st %g7, [%g1] | |
| 36 | #endif | |
| 37 | wr %g3, 0, %psr | |
| 38 | add %g7, 1, %g7 | |
| 39 | nop | |
| 40 | nop | |
| 41 | subcc %g7, 1, %g7 | |
| 42 | bneg 3f | |
| 43 | nop | |
| 44 | 2: jmpl %o7, %g0 | |
| 45 | mov %g4, %o7 | |
| 46 | 3: save %sp, -64, %sp | |
| 47 | mov %g1, %l1 | |
| 48 | mov %g4, %l4 | |
| 49 | bcs 4f | |
| 50 | mov %g5, %l5 | |
| 51 | call down_read_failed | |
| 52 | mov %l1, %o0 | |
| 53 | mov %l1, %g1 | |
| 54 | mov %l4, %g4 | |
| 55 | ba ___down_read | |
| 56 | restore %l5, %g0, %g5 | |
| 57 | 4: call down_read_failed_biased | |
| 58 | mov %l1, %o0 | |
| 59 | mov %l1, %g1 | |
| 60 | mov %l4, %g4 | |
| 61 | ba 2b | |
| 62 | restore %l5, %g0, %g5 | |
| 63 | ||
| 64 | .globl ___down_write | |
| 65 | ___down_write: | |
| 66 | rd %psr, %g3 | |
| 67 | nop | |
| 68 | nop | |
| 69 | nop | |
| 70 | or %g3, PSR_PIL, %g7 | |
| 71 | wr %g7, 0, %psr | |
| 72 | sethi %hi(0x01000000), %g2 | |
| 73 | nop | |
| 74 | nop | |
| 75 | #ifdef CONFIG_SMP | |
| 76 | 1: ldstub [%g1 + 4], %g7 | |
| 77 | tst %g7 | |
| 78 | bne 1b | |
| 79 | ld [%g1], %g7 | |
| 80 | sub %g7, %g2, %g7 | |
| 81 | st %g7, [%g1] | |
| 82 | stb %g0, [%g1 + 4] | |
| 83 | #else | |
| 84 | ld [%g1], %g7 | |
| 85 | sub %g7, %g2, %g7 | |
| 86 | st %g7, [%g1] | |
| 87 | #endif | |
| 88 | wr %g3, 0, %psr | |
| 89 | add %g7, %g2, %g7 | |
| 90 | nop | |
| 91 | nop | |
| 92 | subcc %g7, %g2, %g7 | |
| 93 | bne 3f | |
| 94 | nop | |
| 95 | 2: jmpl %o7, %g0 | |
| 96 | mov %g4, %o7 | |
| 97 | 3: save %sp, -64, %sp | |
| 98 | mov %g1, %l1 | |
| 99 | mov %g4, %l4 | |
| 100 | bcs 4f | |
| 101 | mov %g5, %l5 | |
| 102 | call down_write_failed | |
| 103 | mov %l1, %o0 | |
| 104 | mov %l1, %g1 | |
| 105 | mov %l4, %g4 | |
| 106 | ba ___down_write | |
| 107 | restore %l5, %g0, %g5 | |
| 108 | 4: call down_write_failed_biased | |
| 109 | mov %l1, %o0 | |
| 110 | mov %l1, %g1 | |
| 111 | mov %l4, %g4 | |
| 112 | ba 2b | |
| 113 | restore %l5, %g0, %g5 | |
| 114 | ||
| 115 | .text | |
| 116 | .globl ___up_read | |
| 117 | ___up_read: | |
| 118 | rd %psr, %g3 | |
| 119 | nop | |
| 120 | nop | |
| 121 | nop | |
| 122 | or %g3, PSR_PIL, %g7 | |
| 123 | wr %g7, 0, %psr | |
| 124 | nop | |
| 125 | nop | |
| 126 | nop | |
| 127 | #ifdef CONFIG_SMP | |
| 128 | 1: ldstub [%g1 + 4], %g7 | |
| 129 | tst %g7 | |
| 130 | bne 1b | |
| 131 | ld [%g1], %g7 | |
| 132 | add %g7, 1, %g7 | |
| 133 | st %g7, [%g1] | |
| 134 | stb %g0, [%g1 + 4] | |
| 135 | #else | |
| 136 | ld [%g1], %g7 | |
| 137 | add %g7, 1, %g7 | |
| 138 | st %g7, [%g1] | |
| 139 | #endif | |
| 140 | wr %g3, 0, %psr | |
| 141 | nop | |
| 142 | nop | |
| 143 | nop | |
| 144 | cmp %g7, 0 | |
| 145 | be 3f | |
| 146 | nop | |
| 147 | 2: jmpl %o7, %g0 | |
| 148 | mov %g4, %o7 | |
| 149 | 3: save %sp, -64, %sp | |
| 150 | mov %g1, %l1 | |
| 151 | mov %g4, %l4 | |
| 152 | mov %g5, %l5 | |
| 153 | clr %o1 | |
| 154 | call __rwsem_wake | |
| 155 | mov %l1, %o0 | |
| 156 | mov %l1, %g1 | |
| 157 | mov %l4, %g4 | |
| 158 | ba 2b | |
| 159 | restore %l5, %g0, %g5 | |
| 160 | ||
| 161 | .globl ___up_write | |
| 162 | ___up_write: | |
| 163 | rd %psr, %g3 | |
| 164 | nop | |
| 165 | nop | |
| 166 | nop | |
| 167 | or %g3, PSR_PIL, %g7 | |
| 168 | wr %g7, 0, %psr | |
| 169 | sethi %hi(0x01000000), %g2 | |
| 170 | nop | |
| 171 | nop | |
| 172 | #ifdef CONFIG_SMP | |
| 173 | 1: ldstub [%g1 + 4], %g7 | |
| 174 | tst %g7 | |
| 175 | bne 1b | |
| 176 | ld [%g1], %g7 | |
| 177 | add %g7, %g2, %g7 | |
| 178 | st %g7, [%g1] | |
| 179 | stb %g0, [%g1 + 4] | |
| 180 | #else | |
| 181 | ld [%g1], %g7 | |
| 182 | add %g7, %g2, %g7 | |
| 183 | st %g7, [%g1] | |
| 184 | #endif | |
| 185 | wr %g3, 0, %psr | |
| 186 | sub %g7, %g2, %g7 | |
| 187 | nop | |
| 188 | nop | |
| 189 | addcc %g7, %g2, %g7 | |
| 190 | bcs 3f | |
| 191 | nop | |
| 192 | 2: jmpl %o7, %g0 | |
| 193 | mov %g4, %o7 | |
| 194 | 3: save %sp, -64, %sp | |
| 195 | mov %g1, %l1 | |
| 196 | mov %g4, %l4 | |
| 197 | mov %g5, %l5 | |
| 198 | mov %g7, %o1 | |
| 199 | call __rwsem_wake | |
| 200 | mov %l1, %o0 | |
| 201 | mov %l1, %g1 | |
| 202 | mov %l4, %g4 | |
| 203 | ba 2b | |
| 204 | restore %l5, %g0, %g5 |