David S. Miller | 24f287e | 2007-10-15 16:41:44 -0700 | [diff] [blame] | 1 | /* atomic.S: These things are too big to do inline. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
David S. Miller | 193d2aa | 2012-11-09 19:37:59 -0800 | [diff] [blame] | 3 | * Copyright (C) 1999, 2007 2012 David S. Miller (davem@davemloft.net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | */ |
| 5 | |
David S. Miller | 8695c37 | 2012-05-11 20:33:22 -0700 | [diff] [blame] | 6 | #include <linux/linkage.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include <asm/asi.h> |
David S. Miller | 24f287e | 2007-10-15 16:41:44 -0700 | [diff] [blame] | 8 | #include <asm/backoff.h> |
Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 9 | #include <asm/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | .text |
| 12 | |
Peter Zijlstra | 3a1adb2 | 2016-04-18 01:16:04 +0200 | [diff] [blame] | 13 | /* Three versions of the atomic routines, one that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * does not return a value and does not perform |
Peter Zijlstra | 3a1adb2 | 2016-04-18 01:16:04 +0200 | [diff] [blame] | 15 | * memory barriers, and a two which return |
| 16 | * a value, the new and old value resp. and does the |
| 17 | * barriers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 20 | #define ATOMIC_OP(op) \ |
| 21 | ENTRY(atomic_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ |
| 22 | BACKOFF_SETUP(%o2); \ |
| 23 | 1: lduw [%o1], %g1; \ |
| 24 | op %g1, %o0, %g7; \ |
| 25 | cas [%o1], %g1, %g7; \ |
| 26 | cmp %g1, %g7; \ |
| 27 | bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ |
| 28 | nop; \ |
| 29 | retl; \ |
| 30 | nop; \ |
| 31 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ |
| 32 | ENDPROC(atomic_##op); \ |
Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 33 | EXPORT_SYMBOL(atomic_##op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 35 | #define ATOMIC_OP_RETURN(op) \ |
| 36 | ENTRY(atomic_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \ |
| 37 | BACKOFF_SETUP(%o2); \ |
| 38 | 1: lduw [%o1], %g1; \ |
| 39 | op %g1, %o0, %g7; \ |
| 40 | cas [%o1], %g1, %g7; \ |
| 41 | cmp %g1, %g7; \ |
| 42 | bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ |
Peter Zijlstra | caa17d4 | 2014-09-02 11:40:16 +0200 | [diff] [blame] | 43 | op %g1, %o0, %g1; \ |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 44 | retl; \ |
| 45 | sra %g1, 0, %o0; \ |
| 46 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ |
Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 47 | ENDPROC(atomic_##op##_return); \ |
| 48 | EXPORT_SYMBOL(atomic_##op##_return); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Peter Zijlstra | 3a1adb2 | 2016-04-18 01:16:04 +0200 | [diff] [blame] | 50 | #define ATOMIC_FETCH_OP(op) \ |
| 51 | ENTRY(atomic_fetch_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ |
| 52 | BACKOFF_SETUP(%o2); \ |
| 53 | 1: lduw [%o1], %g1; \ |
| 54 | op %g1, %o0, %g7; \ |
| 55 | cas [%o1], %g1, %g7; \ |
| 56 | cmp %g1, %g7; \ |
| 57 | bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ |
| 58 | nop; \ |
| 59 | retl; \ |
| 60 | sra %g1, 0, %o0; \ |
| 61 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ |
Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 62 | ENDPROC(atomic_fetch_##op); \ |
| 63 | EXPORT_SYMBOL(atomic_fetch_##op); |
Peter Zijlstra | 3a1adb2 | 2016-04-18 01:16:04 +0200 | [diff] [blame] | 64 | |
| 65 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 67 | ATOMIC_OPS(add) |
| 68 | ATOMIC_OPS(sub) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 70 | #undef ATOMIC_OPS |
Peter Zijlstra | 3a1adb2 | 2016-04-18 01:16:04 +0200 | [diff] [blame] | 71 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op) |
| 72 | |
| 73 | ATOMIC_OPS(and) |
| 74 | ATOMIC_OPS(or) |
| 75 | ATOMIC_OPS(xor) |
| 76 | |
| 77 | #undef ATOMIC_OPS |
| 78 | #undef ATOMIC_FETCH_OP |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 79 | #undef ATOMIC_OP_RETURN |
| 80 | #undef ATOMIC_OP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 82 | #define ATOMIC64_OP(op) \ |
| 83 | ENTRY(atomic64_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ |
| 84 | BACKOFF_SETUP(%o2); \ |
| 85 | 1: ldx [%o1], %g1; \ |
| 86 | op %g1, %o0, %g7; \ |
| 87 | casx [%o1], %g1, %g7; \ |
| 88 | cmp %g1, %g7; \ |
| 89 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ |
| 90 | nop; \ |
| 91 | retl; \ |
| 92 | nop; \ |
| 93 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ |
| 94 | ENDPROC(atomic64_##op); \ |
Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 95 | EXPORT_SYMBOL(atomic64_##op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 97 | #define ATOMIC64_OP_RETURN(op) \ |
| 98 | ENTRY(atomic64_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \ |
| 99 | BACKOFF_SETUP(%o2); \ |
| 100 | 1: ldx [%o1], %g1; \ |
| 101 | op %g1, %o0, %g7; \ |
| 102 | casx [%o1], %g1, %g7; \ |
| 103 | cmp %g1, %g7; \ |
| 104 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ |
| 105 | nop; \ |
| 106 | retl; \ |
Peter Zijlstra | caa17d4 | 2014-09-02 11:40:16 +0200 | [diff] [blame] | 107 | op %g1, %o0, %o0; \ |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 108 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ |
Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 109 | ENDPROC(atomic64_##op##_return); \ |
| 110 | EXPORT_SYMBOL(atomic64_##op##_return); |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 111 | |
Peter Zijlstra | 3a1adb2 | 2016-04-18 01:16:04 +0200 | [diff] [blame] | 112 | #define ATOMIC64_FETCH_OP(op) \ |
| 113 | ENTRY(atomic64_fetch_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ |
| 114 | BACKOFF_SETUP(%o2); \ |
| 115 | 1: ldx [%o1], %g1; \ |
| 116 | op %g1, %o0, %g7; \ |
| 117 | casx [%o1], %g1, %g7; \ |
| 118 | cmp %g1, %g7; \ |
| 119 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ |
| 120 | nop; \ |
| 121 | retl; \ |
| 122 | mov %g1, %o0; \ |
| 123 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ |
Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 124 | ENDPROC(atomic64_fetch_##op); \ |
| 125 | EXPORT_SYMBOL(atomic64_fetch_##op); |
Peter Zijlstra | 3a1adb2 | 2016-04-18 01:16:04 +0200 | [diff] [blame] | 126 | |
| 127 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 128 | |
| 129 | ATOMIC64_OPS(add) |
| 130 | ATOMIC64_OPS(sub) |
| 131 | |
| 132 | #undef ATOMIC64_OPS |
Peter Zijlstra | 3a1adb2 | 2016-04-18 01:16:04 +0200 | [diff] [blame] | 133 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) |
| 134 | |
| 135 | ATOMIC64_OPS(and) |
| 136 | ATOMIC64_OPS(or) |
| 137 | ATOMIC64_OPS(xor) |
| 138 | |
| 139 | #undef ATOMIC64_OPS |
| 140 | #undef ATOMIC64_FETCH_OP |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame] | 141 | #undef ATOMIC64_OP_RETURN |
| 142 | #undef ATOMIC64_OP |
David S. Miller | 193d2aa | 2012-11-09 19:37:59 -0800 | [diff] [blame] | 143 | |
| 144 | ENTRY(atomic64_dec_if_positive) /* %o0 = atomic_ptr */ |
| 145 | BACKOFF_SETUP(%o2) |
| 146 | 1: ldx [%o0], %g1 |
| 147 | brlez,pn %g1, 3f |
| 148 | sub %g1, 1, %g7 |
| 149 | casx [%o0], %g1, %g7 |
| 150 | cmp %g1, %g7 |
| 151 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b) |
| 152 | nop |
| 153 | 3: retl |
| 154 | sub %g1, 1, %o0 |
| 155 | 2: BACKOFF_SPIN(%o2, %o3, 1b) |
| 156 | ENDPROC(atomic64_dec_if_positive) |
Al Viro | d3867f04 | 2016-01-16 21:39:30 -0500 | [diff] [blame] | 157 | EXPORT_SYMBOL(atomic64_dec_if_positive) |