Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_gcc_atomic_ppc.h @ 5834:ca63fc5ed9b1
SSL: session id context now includes certificate hash.
This prevents inappropriate session reuse in unrelated server{}
blocks, while preserving ability to restore sessions on other servers
when using TLS Session Tickets.
Additionally, session context is now set even if there is no session cache
configured. This is needed as it's also used for TLS Session Tickets.
Thanks to Antoine Delignat-Lavaud and Piotr Sikora.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 15 Sep 2014 17:59:47 +0400 |
parents | d620f497c50f |
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rev | line source |
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561 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
561 | 5 */ |
6 | |
7 | |
8 /* | |
9 * The ppc assembler treats ";" as comment, so we have to use "\n". | |
10 * The minus in "bne-" is a hint for the branch prediction unit that | |
11 * this branch is unlikely to be taken. | |
12 * The "1b" means the nearest backward label "1" and the "1f" means | |
13 * the nearest forward label "1". | |
577 | 14 * |
561 | 15 * The "b" means that the base registers can be used only, i.e. |
16 * any register except r0. The r0 register always has a zero value and | |
17 * could not be used in "addi r0, r0, 1". | |
18 * The "=&b" means that no input registers can be used. | |
938 | 19 * |
20 * "sync" read and write barriers | |
21 * "isync" read barrier, is faster than "sync" | |
22 * "eieio" write barrier, is faster than "sync" | |
23 * "lwsync" write barrier, is faster than "eieio" on ppc64 | |
561 | 24 */ |
25 | |
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26 #if (NGX_PTR_SIZE == 8) |
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27 |
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28 static ngx_inline ngx_atomic_uint_t |
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29 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, |
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30 ngx_atomic_uint_t set) |
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31 { |
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32 ngx_atomic_uint_t res, temp; |
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33 |
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34 __asm__ volatile ( |
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35 |
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36 " li %0, 0 \n" /* preset "0" to "res" */ |
938 | 37 " lwsync \n" /* write barrier */ |
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38 "1: \n" |
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39 " ldarx %1, 0, %2 \n" /* load from [lock] into "temp" */ |
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40 /* and store reservation */ |
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41 " cmpd %1, %3 \n" /* compare "temp" and "old" */ |
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42 " bne- 2f \n" /* not equal */ |
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43 " stdcx. %4, 0, %2 \n" /* store "set" into [lock] if reservation */ |
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44 /* is not cleared */ |
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45 " bne- 1b \n" /* the reservation was cleared */ |
938 | 46 " isync \n" /* read barrier */ |
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47 " li %0, 1 \n" /* set "1" to "res" */ |
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48 "2: \n" |
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49 |
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50 : "=&b" (res), "=&b" (temp) |
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51 : "b" (lock), "b" (old), "b" (set) |
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52 : "cc", "memory"); |
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53 |
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54 return res; |
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55 } |
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56 |
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57 |
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58 static ngx_inline ngx_atomic_int_t |
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59 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) |
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60 { |
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61 ngx_atomic_uint_t res, temp; |
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62 |
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63 __asm__ volatile ( |
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64 |
938 | 65 " lwsync \n" /* write barrier */ |
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66 "1: ldarx %0, 0, %2 \n" /* load from [value] into "res" */ |
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67 /* and store reservation */ |
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68 " add %1, %0, %3 \n" /* "res" + "add" store in "temp" */ |
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69 " stdcx. %1, 0, %2 \n" /* store "temp" into [value] if reservation */ |
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70 /* is not cleared */ |
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71 " bne- 1b \n" /* try again if reservation was cleared */ |
938 | 72 " isync \n" /* read barrier */ |
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73 |
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74 : "=&b" (res), "=&b" (temp) |
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75 : "b" (value), "b" (add) |
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76 : "cc", "memory"); |
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77 |
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78 return res; |
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79 } |
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80 |
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81 |
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82 #if (NGX_SMP) |
938 | 83 #define ngx_memory_barrier() \ |
84 __asm__ volatile ("isync \n lwsync \n" ::: "memory") | |
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85 #else |
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86 #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory") |
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87 #endif |
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88 |
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89 #else |
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90 |
561 | 91 static ngx_inline ngx_atomic_uint_t |
92 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
93 ngx_atomic_uint_t set) | |
94 { | |
95 ngx_atomic_uint_t res, temp; | |
96 | |
97 __asm__ volatile ( | |
98 | |
99 " li %0, 0 \n" /* preset "0" to "res" */ | |
938 | 100 " eieio \n" /* write barrier */ |
937
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101 "1: \n" |
561 | 102 " lwarx %1, 0, %2 \n" /* load from [lock] into "temp" */ |
103 /* and store reservation */ | |
104 " cmpw %1, %3 \n" /* compare "temp" and "old" */ | |
937
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105 " bne- 2f \n" /* not equal */ |
561 | 106 " stwcx. %4, 0, %2 \n" /* store "set" into [lock] if reservation */ |
107 /* is not cleared */ | |
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108 " bne- 1b \n" /* the reservation was cleared */ |
938 | 109 " isync \n" /* read barrier */ |
561 | 110 " li %0, 1 \n" /* set "1" to "res" */ |
937
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111 "2: \n" |
561 | 112 |
113 : "=&b" (res), "=&b" (temp) | |
114 : "b" (lock), "b" (old), "b" (set) | |
115 : "cc", "memory"); | |
116 | |
117 return res; | |
118 } | |
119 | |
120 | |
121 static ngx_inline ngx_atomic_int_t | |
122 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) | |
123 { | |
124 ngx_atomic_uint_t res, temp; | |
125 | |
126 __asm__ volatile ( | |
127 | |
938 | 128 " eieio \n" /* write barrier */ |
561 | 129 "1: lwarx %0, 0, %2 \n" /* load from [value] into "res" */ |
130 /* and store reservation */ | |
131 " add %1, %0, %3 \n" /* "res" + "add" store in "temp" */ | |
132 " stwcx. %1, 0, %2 \n" /* store "temp" into [value] if reservation */ | |
133 /* is not cleared */ | |
134 " bne- 1b \n" /* try again if reservation was cleared */ | |
938 | 135 " isync \n" /* read barrier */ |
561 | 136 |
137 : "=&b" (res), "=&b" (temp) | |
138 : "b" (value), "b" (add) | |
139 : "cc", "memory"); | |
140 | |
141 return res; | |
142 } | |
563 | 143 |
144 | |
145 #if (NGX_SMP) | |
938 | 146 #define ngx_memory_barrier() \ |
147 __asm__ volatile ("isync \n eieio \n" ::: "memory") | |
563 | 148 #else |
149 #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory") | |
150 #endif | |
611 | 151 |
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152 #endif |
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153 |
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154 |
611 | 155 #define ngx_cpu_pause() |