sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame] | 1 | |
bart | 7b35d21 | 2008-06-26 08:58:25 +0000 | [diff] [blame] | 2 | #include "config.h" |
sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame] | 3 | #include <pthread.h> |
| 4 | #include <stdio.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <assert.h> |
| 7 | |
| 8 | /* Simple test program, no race. Parent and child both modify x and |
| 9 | use the hardware bus lock (implicitly, since XCHG r,m on x86/amd64 |
| 10 | does not require an explicit LOCK prefix.). */ |
| 11 | |
sewardj | 8777f73 | 2010-01-02 10:43:23 +0000 | [diff] [blame] | 12 | #undef PLAT_x86_darwin |
| 13 | #undef PLAT_amd64_darwin |
sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame] | 14 | #undef PLAT_x86_linux |
| 15 | #undef PLAT_amd64_linux |
| 16 | #undef PLAT_ppc32_linux |
carll | dd690bf | 2014-08-07 23:49:27 +0000 | [diff] [blame] | 17 | #undef PLAT_ppc64be_linux |
sewardj | 8777f73 | 2010-01-02 10:43:23 +0000 | [diff] [blame] | 18 | #undef PLAT_arm_linux |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 19 | #undef PLAT_s390x_linux |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 20 | #undef PLAT_mips32_linux |
sewardj | 8eb8bab | 2015-07-21 14:44:28 +0000 | [diff] [blame] | 21 | #undef PLAT_x86_solaris |
| 22 | #undef PLAT_amd64_solaris |
sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame] | 23 | |
sewardj | 6e9de46 | 2011-06-28 07:25:29 +0000 | [diff] [blame] | 24 | #if defined(__APPLE__) && defined(__i386__) |
sewardj | 8777f73 | 2010-01-02 10:43:23 +0000 | [diff] [blame] | 25 | # define PLAT_x86_darwin 1 |
| 26 | #elif defined(__APPLE__) && defined(__x86_64__) |
| 27 | # define PLAT_amd64_darwin 1 |
| 28 | #elif defined(__linux__) && defined(__i386__) |
| 29 | # define PLAT_x86_linux 1 |
| 30 | #elif defined(__linux__) && defined(__x86_64__) |
| 31 | # define PLAT_amd64_linux 1 |
| 32 | #elif defined(__linux__) && defined(__powerpc__) && !defined(__powerpc64__) |
| 33 | # define PLAT_ppc32_linux 1 |
| 34 | #elif defined(__linux__) && defined(__powerpc__) && defined(__powerpc64__) |
| 35 | # define PLAT_ppc64_linux 1 |
sewardj | 23ed630 | 2014-03-18 23:02:59 +0000 | [diff] [blame] | 36 | #elif defined(__linux__) && defined(__arm__) && !defined(__aarch64__) |
sewardj | 8777f73 | 2010-01-02 10:43:23 +0000 | [diff] [blame] | 37 | # define PLAT_arm_linux 1 |
sewardj | 23ed630 | 2014-03-18 23:02:59 +0000 | [diff] [blame] | 38 | #elif defined(__linux__) && defined(__aarch64__) && !defined(__arm__) |
| 39 | # define PLAT_arm64_linux 1 |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 40 | #elif defined(__linux__) && defined(__s390x__) |
| 41 | # define PLAT_s390x_linux 1 |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 42 | #elif defined(__linux__) && defined(__mips__) |
| 43 | # define PLAT_mips32_linux 1 |
sewardj | 8eb8bab | 2015-07-21 14:44:28 +0000 | [diff] [blame] | 44 | #elif defined(__sun__) && defined(__i386__) |
| 45 | # define PLAT_x86_solaris 1 |
| 46 | #elif defined(__sun__) && defined(__x86_64__) |
| 47 | # define PLAT_amd64_solaris 1 |
sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame] | 48 | #endif |
| 49 | |
| 50 | |
sewardj | f5b5f84 | 2010-01-04 10:47:25 +0000 | [diff] [blame] | 51 | #if defined(PLAT_amd64_linux) || defined(PLAT_x86_linux) \ |
sewardj | 8eb8bab | 2015-07-21 14:44:28 +0000 | [diff] [blame] | 52 | || defined(PLAT_amd64_darwin) || defined(PLAT_x86_darwin) \ |
| 53 | || defined(PLAT_amd64_solaris) || defined(PLAT_x86_solaris) |
sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame] | 54 | # define XCHG_M_R(_addr,_lval) \ |
| 55 | __asm__ __volatile__( \ |
| 56 | "xchgl %0, %1" \ |
| 57 | : /*out*/ "+r"(_lval) \ |
| 58 | : /*in*/ "m"(_addr) \ |
| 59 | : "memory", "cc" \ |
| 60 | ) |
| 61 | # define XCHG_M_R_with_redundant_LOCK(_addr,_lval) \ |
| 62 | __asm__ __volatile__( \ |
| 63 | "lock xchgl %0, %1" \ |
| 64 | : /*out*/ "+r"(_lval) \ |
| 65 | : /*in*/ "m"(_addr) \ |
| 66 | : "memory", "cc" \ |
| 67 | ) |
sewardj | b8544e2 | 2008-10-21 23:12:56 +0000 | [diff] [blame] | 68 | |
florian | bed336a | 2011-09-09 18:37:55 +0000 | [diff] [blame] | 69 | #elif defined(PLAT_s390x_linux) |
| 70 | # define XCHG_M_R(_addr,_lval) \ |
| 71 | do { \ |
| 72 | __asm__ __volatile__( \ |
| 73 | "0: l 0,%[global]\n\t" \ |
| 74 | " cs 0,%[local],%[global]\n\t" \ |
| 75 | " bne 0b\n\t" \ |
| 76 | " lr %[local],0\n\t" \ |
| 77 | : /*out*/ [global]"+m"(_addr), [local]"+d"(_lval) \ |
| 78 | : /*in*/ \ |
| 79 | : "0", "memory", "cc" \ |
| 80 | ); \ |
| 81 | } while (0) |
| 82 | |
| 83 | # define XCHG_M_R_with_redundant_LOCK(_addr,_lval) \ |
| 84 | XCHG_M_R(_addr,_lval) |
| 85 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 86 | #elif defined(PLAT_mips32_linux) || defined(PLAT_mips64_linux) |
| 87 | # define XCHG_M_R(_addr,_lval) \ |
| 88 | __asm__ __volatile__( \ |
| 89 | "move $12, %2\n" \ |
| 90 | "move $13, %1\n" \ |
| 91 | "ll $14, 0($13)\n" \ |
| 92 | "sc $12, 0($13)\n" \ |
| 93 | "move %0, $14\n" \ |
| 94 | : /*out*/ "=r"(_lval) \ |
| 95 | : /*in*/ "r"(&_addr), "r"(_lval) \ |
| 96 | : "$12", "$13", "$14", "memory", "cc" \ |
| 97 | ) |
| 98 | |
| 99 | # define XCHG_M_R_with_redundant_LOCK(_addr,_lval) \ |
| 100 | XCHG_M_R(_addr,_lval) |
| 101 | |
bart | 5df2609 | 2008-06-26 08:34:53 +0000 | [diff] [blame] | 102 | #elif defined(PLAT_ppc32_linux) || defined(PLAT_ppc64_linux) \ |
sewardj | 23ed630 | 2014-03-18 23:02:59 +0000 | [diff] [blame] | 103 | || defined(PLAT_arm_linux) || defined(PLAT_arm64_linux) |
sewardj | b8544e2 | 2008-10-21 23:12:56 +0000 | [diff] [blame] | 104 | # if defined(HAVE_BUILTIN_ATOMIC) |
| 105 | # define XCHG_M_R(_addr,_lval) \ |
| 106 | do { \ |
| 107 | int tmp; \ |
| 108 | while ((tmp = *(int*)(& _addr)), \ |
| 109 | ! __sync_bool_compare_and_swap((int*)&_addr, tmp, _lval)) \ |
| 110 | ; \ |
| 111 | _lval = tmp; \ |
| 112 | } while (0) |
| 113 | # else |
| 114 | # warning "XCHG_M_R() implementation is missing. Either" \ |
| 115 | "provide one or use a newer gcc version." |
| 116 | # define XCHG_M_R(_addr,_lval) \ |
| 117 | do { int tmp = *(int*)(& _addr); \ |
| 118 | *(int*)(& _addr) = (_lval); \ |
| 119 | _lval = tmp; \ |
| 120 | } while (0) |
| 121 | # endif |
bart | 5df2609 | 2008-06-26 08:34:53 +0000 | [diff] [blame] | 122 | # define XCHG_M_R_with_redundant_LOCK(_addr,_lval) \ |
| 123 | XCHG_M_R(_addr,_lval) |
sewardj | b8544e2 | 2008-10-21 23:12:56 +0000 | [diff] [blame] | 124 | |
sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame] | 125 | #else |
sewardj | b8544e2 | 2008-10-21 23:12:56 +0000 | [diff] [blame] | 126 | # error "Unsupported architecture" |
| 127 | |
sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame] | 128 | #endif |
| 129 | |
| 130 | int x = 0; |
| 131 | |
| 132 | void* child_fn ( void* arg ) |
| 133 | { |
| 134 | int v = 12345; |
| 135 | XCHG_M_R_with_redundant_LOCK(x, v); |
| 136 | assert(v == 0 || v == 6789); |
| 137 | return NULL; |
| 138 | } |
| 139 | |
| 140 | int main ( void ) |
| 141 | { |
| 142 | int v = 6789; |
| 143 | pthread_t child; |
| 144 | |
| 145 | if (pthread_create(&child, NULL, child_fn, NULL)) { |
| 146 | perror("pthread_create"); |
| 147 | exit(1); |
| 148 | } |
| 149 | |
| 150 | XCHG_M_R(x, v); |
| 151 | assert(v == 0 || v == 12345); |
| 152 | |
| 153 | if (pthread_join(child, NULL)) { |
| 154 | perror("pthread join"); |
| 155 | exit(1); |
| 156 | } |
| 157 | |
| 158 | if (v == 0 || v == 12345) |
| 159 | printf("success\n"); |
| 160 | else |
| 161 | printf("failure\n"); |
| 162 | |
| 163 | return v; |
| 164 | } |