Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: LGPL-2.1 OR MIT */ |
| 2 | |
Martin Schwidefsky | e24e471 | 2019-04-10 12:28:41 +0200 | [diff] [blame] | 3 | /* |
| 4 | * RSEQ_SIG uses the trap4 instruction. As Linux does not make use of the |
| 5 | * access-register mode nor the linkage stack this instruction will always |
| 6 | * cause a special-operation exception (the trap-enabled bit in the DUCT |
| 7 | * is and will stay 0). The instruction pattern is |
| 8 | * b2 ff 0f ff trap4 4095(%r0) |
| 9 | */ |
| 10 | #define RSEQ_SIG 0xB2FF0FFF |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 11 | |
| 12 | #define rseq_smp_mb() __asm__ __volatile__ ("bcr 15,0" ::: "memory") |
| 13 | #define rseq_smp_rmb() rseq_smp_mb() |
| 14 | #define rseq_smp_wmb() rseq_smp_mb() |
| 15 | |
| 16 | #define rseq_smp_load_acquire(p) \ |
| 17 | __extension__ ({ \ |
| 18 | __typeof(*p) ____p1 = RSEQ_READ_ONCE(*p); \ |
| 19 | rseq_barrier(); \ |
| 20 | ____p1; \ |
| 21 | }) |
| 22 | |
| 23 | #define rseq_smp_acquire__after_ctrl_dep() rseq_smp_rmb() |
| 24 | |
| 25 | #define rseq_smp_store_release(p, v) \ |
| 26 | do { \ |
| 27 | rseq_barrier(); \ |
| 28 | RSEQ_WRITE_ONCE(*p, v); \ |
| 29 | } while (0) |
| 30 | |
| 31 | #ifdef RSEQ_SKIP_FASTPATH |
| 32 | #include "rseq-skip.h" |
| 33 | #else /* !RSEQ_SKIP_FASTPATH */ |
| 34 | |
| 35 | #ifdef __s390x__ |
| 36 | |
| 37 | #define LONG_L "lg" |
| 38 | #define LONG_S "stg" |
| 39 | #define LONG_LT_R "ltgr" |
| 40 | #define LONG_CMP "cg" |
| 41 | #define LONG_CMP_R "cgr" |
| 42 | #define LONG_ADDI "aghi" |
| 43 | #define LONG_ADD_R "agr" |
| 44 | |
| 45 | #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \ |
| 46 | start_ip, post_commit_offset, abort_ip) \ |
Mathieu Desnoyers | a3e3131 | 2019-04-29 11:27:54 -0400 | [diff] [blame] | 47 | ".pushsection __rseq_cs, \"aw\"\n\t" \ |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 48 | ".balign 32\n\t" \ |
| 49 | __rseq_str(label) ":\n\t" \ |
| 50 | ".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \ |
| 51 | ".quad " __rseq_str(start_ip) ", " __rseq_str(post_commit_offset) ", " __rseq_str(abort_ip) "\n\t" \ |
Mathieu Desnoyers | a3e3131 | 2019-04-29 11:27:54 -0400 | [diff] [blame] | 52 | ".popsection\n\t" \ |
| 53 | ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \ |
| 54 | ".quad " __rseq_str(label) "b\n\t" \ |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 55 | ".popsection\n\t" |
| 56 | |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 57 | /* |
| 58 | * Exit points of a rseq critical section consist of all instructions outside |
| 59 | * of the critical section where a critical section can either branch to or |
| 60 | * reach through the normal course of its execution. The abort IP and the |
Mathieu Desnoyers | a3e3131 | 2019-04-29 11:27:54 -0400 | [diff] [blame] | 61 | * post-commit IP are already part of the __rseq_cs section and should not be |
| 62 | * explicitly defined as additional exit points. Knowing all exit points is |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 63 | * useful to assist debuggers stepping over the critical section. |
| 64 | */ |
| 65 | #define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \ |
| 66 | ".pushsection __rseq_exit_point_array, \"aw\"\n\t" \ |
| 67 | ".quad " __rseq_str(start_ip) ", " __rseq_str(exit_ip) "\n\t" \ |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 68 | ".popsection\n\t" |
| 69 | |
| 70 | #elif __s390__ |
| 71 | |
| 72 | #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \ |
| 73 | start_ip, post_commit_offset, abort_ip) \ |
Mathieu Desnoyers | a3e3131 | 2019-04-29 11:27:54 -0400 | [diff] [blame] | 74 | ".pushsection __rseq_cs, \"aw\"\n\t" \ |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 75 | ".balign 32\n\t" \ |
| 76 | __rseq_str(label) ":\n\t" \ |
| 77 | ".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \ |
| 78 | ".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) "\n\t" \ |
Mathieu Desnoyers | a3e3131 | 2019-04-29 11:27:54 -0400 | [diff] [blame] | 79 | ".popsection\n\t" \ |
| 80 | ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \ |
| 81 | ".long 0x0, " __rseq_str(label) "b\n\t" \ |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 82 | ".popsection\n\t" |
| 83 | |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 84 | /* |
| 85 | * Exit points of a rseq critical section consist of all instructions outside |
| 86 | * of the critical section where a critical section can either branch to or |
| 87 | * reach through the normal course of its execution. The abort IP and the |
Mathieu Desnoyers | a3e3131 | 2019-04-29 11:27:54 -0400 | [diff] [blame] | 88 | * post-commit IP are already part of the __rseq_cs section and should not be |
| 89 | * explicitly defined as additional exit points. Knowing all exit points is |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 90 | * useful to assist debuggers stepping over the critical section. |
| 91 | */ |
| 92 | #define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \ |
| 93 | ".pushsection __rseq_exit_point_array, \"aw\"\n\t" \ |
| 94 | ".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(exit_ip) "\n\t" \ |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 95 | ".popsection\n\t" |
| 96 | |
| 97 | #define LONG_L "l" |
| 98 | #define LONG_S "st" |
| 99 | #define LONG_LT_R "ltr" |
| 100 | #define LONG_CMP "c" |
| 101 | #define LONG_CMP_R "cr" |
| 102 | #define LONG_ADDI "ahi" |
| 103 | #define LONG_ADD_R "ar" |
| 104 | |
| 105 | #endif |
| 106 | |
| 107 | #define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \ |
| 108 | __RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \ |
| 109 | (post_commit_ip - start_ip), abort_ip) |
| 110 | |
| 111 | #define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \ |
| 112 | RSEQ_INJECT_ASM(1) \ |
| 113 | "larl %%r0, " __rseq_str(cs_label) "\n\t" \ |
| 114 | LONG_S " %%r0, %[" __rseq_str(rseq_cs) "]\n\t" \ |
| 115 | __rseq_str(label) ":\n\t" |
| 116 | |
| 117 | #define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \ |
| 118 | RSEQ_INJECT_ASM(2) \ |
| 119 | "c %[" __rseq_str(cpu_id) "], %[" __rseq_str(current_cpu_id) "]\n\t" \ |
| 120 | "jnz " __rseq_str(label) "\n\t" |
| 121 | |
| 122 | #define RSEQ_ASM_DEFINE_ABORT(label, teardown, abort_label) \ |
| 123 | ".pushsection __rseq_failure, \"ax\"\n\t" \ |
| 124 | ".long " __rseq_str(RSEQ_SIG) "\n\t" \ |
| 125 | __rseq_str(label) ":\n\t" \ |
| 126 | teardown \ |
Mathieu Desnoyers | 97b8be8 | 2019-04-29 11:27:56 -0400 | [diff] [blame] | 127 | "jg %l[" __rseq_str(abort_label) "]\n\t" \ |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 128 | ".popsection\n\t" |
| 129 | |
| 130 | #define RSEQ_ASM_DEFINE_CMPFAIL(label, teardown, cmpfail_label) \ |
| 131 | ".pushsection __rseq_failure, \"ax\"\n\t" \ |
| 132 | __rseq_str(label) ":\n\t" \ |
| 133 | teardown \ |
Mathieu Desnoyers | 97b8be8 | 2019-04-29 11:27:56 -0400 | [diff] [blame] | 134 | "jg %l[" __rseq_str(cmpfail_label) "]\n\t" \ |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 135 | ".popsection\n\t" |
| 136 | |
| 137 | static inline __attribute__((always_inline)) |
| 138 | int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu) |
| 139 | { |
| 140 | RSEQ_INJECT_C(9) |
| 141 | |
| 142 | __asm__ __volatile__ goto ( |
| 143 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 144 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
| 145 | #ifdef RSEQ_COMPARE_TWICE |
| 146 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) |
| 147 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) |
| 148 | #endif |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 149 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
| 150 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) |
| 151 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) |
| 152 | RSEQ_INJECT_ASM(3) |
| 153 | LONG_CMP " %[expect], %[v]\n\t" |
| 154 | "jnz %l[cmpfail]\n\t" |
| 155 | RSEQ_INJECT_ASM(4) |
| 156 | #ifdef RSEQ_COMPARE_TWICE |
| 157 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) |
| 158 | LONG_CMP " %[expect], %[v]\n\t" |
| 159 | "jnz %l[error2]\n\t" |
| 160 | #endif |
| 161 | /* final store */ |
| 162 | LONG_S " %[newv], %[v]\n\t" |
| 163 | "2:\n\t" |
| 164 | RSEQ_INJECT_ASM(5) |
| 165 | RSEQ_ASM_DEFINE_ABORT(4, "", abort) |
| 166 | : /* gcc asm goto does not allow outputs */ |
| 167 | : [cpu_id] "r" (cpu), |
| 168 | [current_cpu_id] "m" (__rseq_abi.cpu_id), |
| 169 | [rseq_cs] "m" (__rseq_abi.rseq_cs), |
| 170 | [v] "m" (*v), |
| 171 | [expect] "r" (expect), |
| 172 | [newv] "r" (newv) |
| 173 | RSEQ_INJECT_INPUT |
| 174 | : "memory", "cc", "r0" |
| 175 | RSEQ_INJECT_CLOBBER |
| 176 | : abort, cmpfail |
| 177 | #ifdef RSEQ_COMPARE_TWICE |
| 178 | , error1, error2 |
| 179 | #endif |
| 180 | ); |
| 181 | return 0; |
| 182 | abort: |
| 183 | RSEQ_INJECT_FAILED |
| 184 | return -1; |
| 185 | cmpfail: |
| 186 | return 1; |
| 187 | #ifdef RSEQ_COMPARE_TWICE |
| 188 | error1: |
| 189 | rseq_bug("cpu_id comparison failed"); |
| 190 | error2: |
| 191 | rseq_bug("expected value comparison failed"); |
| 192 | #endif |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * Compare @v against @expectnot. When it does _not_ match, load @v |
| 197 | * into @load, and store the content of *@v + voffp into @v. |
| 198 | */ |
| 199 | static inline __attribute__((always_inline)) |
| 200 | int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot, |
| 201 | off_t voffp, intptr_t *load, int cpu) |
| 202 | { |
| 203 | RSEQ_INJECT_C(9) |
| 204 | |
| 205 | __asm__ __volatile__ goto ( |
| 206 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 207 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
| 208 | #ifdef RSEQ_COMPARE_TWICE |
| 209 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) |
| 210 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) |
| 211 | #endif |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 212 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
| 213 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) |
| 214 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) |
| 215 | RSEQ_INJECT_ASM(3) |
| 216 | LONG_L " %%r1, %[v]\n\t" |
| 217 | LONG_CMP_R " %%r1, %[expectnot]\n\t" |
| 218 | "je %l[cmpfail]\n\t" |
| 219 | RSEQ_INJECT_ASM(4) |
| 220 | #ifdef RSEQ_COMPARE_TWICE |
| 221 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) |
| 222 | LONG_L " %%r1, %[v]\n\t" |
| 223 | LONG_CMP_R " %%r1, %[expectnot]\n\t" |
| 224 | "je %l[error2]\n\t" |
| 225 | #endif |
| 226 | LONG_S " %%r1, %[load]\n\t" |
| 227 | LONG_ADD_R " %%r1, %[voffp]\n\t" |
| 228 | LONG_L " %%r1, 0(%%r1)\n\t" |
| 229 | /* final store */ |
| 230 | LONG_S " %%r1, %[v]\n\t" |
| 231 | "2:\n\t" |
| 232 | RSEQ_INJECT_ASM(5) |
| 233 | RSEQ_ASM_DEFINE_ABORT(4, "", abort) |
| 234 | : /* gcc asm goto does not allow outputs */ |
| 235 | : [cpu_id] "r" (cpu), |
| 236 | [current_cpu_id] "m" (__rseq_abi.cpu_id), |
| 237 | [rseq_cs] "m" (__rseq_abi.rseq_cs), |
| 238 | /* final store input */ |
| 239 | [v] "m" (*v), |
| 240 | [expectnot] "r" (expectnot), |
| 241 | [voffp] "r" (voffp), |
| 242 | [load] "m" (*load) |
| 243 | RSEQ_INJECT_INPUT |
| 244 | : "memory", "cc", "r0", "r1" |
| 245 | RSEQ_INJECT_CLOBBER |
| 246 | : abort, cmpfail |
| 247 | #ifdef RSEQ_COMPARE_TWICE |
| 248 | , error1, error2 |
| 249 | #endif |
| 250 | ); |
| 251 | return 0; |
| 252 | abort: |
| 253 | RSEQ_INJECT_FAILED |
| 254 | return -1; |
| 255 | cmpfail: |
| 256 | return 1; |
| 257 | #ifdef RSEQ_COMPARE_TWICE |
| 258 | error1: |
| 259 | rseq_bug("cpu_id comparison failed"); |
| 260 | error2: |
| 261 | rseq_bug("expected value comparison failed"); |
| 262 | #endif |
| 263 | } |
| 264 | |
| 265 | static inline __attribute__((always_inline)) |
| 266 | int rseq_addv(intptr_t *v, intptr_t count, int cpu) |
| 267 | { |
| 268 | RSEQ_INJECT_C(9) |
| 269 | |
| 270 | __asm__ __volatile__ goto ( |
| 271 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 272 | #ifdef RSEQ_COMPARE_TWICE |
| 273 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) |
| 274 | #endif |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 275 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
| 276 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) |
| 277 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) |
| 278 | RSEQ_INJECT_ASM(3) |
| 279 | #ifdef RSEQ_COMPARE_TWICE |
| 280 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) |
| 281 | #endif |
| 282 | LONG_L " %%r0, %[v]\n\t" |
| 283 | LONG_ADD_R " %%r0, %[count]\n\t" |
| 284 | /* final store */ |
| 285 | LONG_S " %%r0, %[v]\n\t" |
| 286 | "2:\n\t" |
| 287 | RSEQ_INJECT_ASM(4) |
| 288 | RSEQ_ASM_DEFINE_ABORT(4, "", abort) |
| 289 | : /* gcc asm goto does not allow outputs */ |
| 290 | : [cpu_id] "r" (cpu), |
| 291 | [current_cpu_id] "m" (__rseq_abi.cpu_id), |
| 292 | [rseq_cs] "m" (__rseq_abi.rseq_cs), |
| 293 | /* final store input */ |
| 294 | [v] "m" (*v), |
| 295 | [count] "r" (count) |
| 296 | RSEQ_INJECT_INPUT |
| 297 | : "memory", "cc", "r0" |
| 298 | RSEQ_INJECT_CLOBBER |
| 299 | : abort |
| 300 | #ifdef RSEQ_COMPARE_TWICE |
| 301 | , error1 |
| 302 | #endif |
| 303 | ); |
| 304 | return 0; |
| 305 | abort: |
| 306 | RSEQ_INJECT_FAILED |
| 307 | return -1; |
| 308 | #ifdef RSEQ_COMPARE_TWICE |
| 309 | error1: |
| 310 | rseq_bug("cpu_id comparison failed"); |
| 311 | #endif |
| 312 | } |
| 313 | |
| 314 | static inline __attribute__((always_inline)) |
| 315 | int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect, |
| 316 | intptr_t *v2, intptr_t newv2, |
| 317 | intptr_t newv, int cpu) |
| 318 | { |
| 319 | RSEQ_INJECT_C(9) |
| 320 | |
| 321 | __asm__ __volatile__ goto ( |
| 322 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 323 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
| 324 | #ifdef RSEQ_COMPARE_TWICE |
| 325 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) |
| 326 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) |
| 327 | #endif |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 328 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
| 329 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) |
| 330 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) |
| 331 | RSEQ_INJECT_ASM(3) |
| 332 | LONG_CMP " %[expect], %[v]\n\t" |
| 333 | "jnz %l[cmpfail]\n\t" |
| 334 | RSEQ_INJECT_ASM(4) |
| 335 | #ifdef RSEQ_COMPARE_TWICE |
| 336 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) |
| 337 | LONG_CMP " %[expect], %[v]\n\t" |
| 338 | "jnz %l[error2]\n\t" |
| 339 | #endif |
| 340 | /* try store */ |
| 341 | LONG_S " %[newv2], %[v2]\n\t" |
| 342 | RSEQ_INJECT_ASM(5) |
| 343 | /* final store */ |
| 344 | LONG_S " %[newv], %[v]\n\t" |
| 345 | "2:\n\t" |
| 346 | RSEQ_INJECT_ASM(6) |
| 347 | RSEQ_ASM_DEFINE_ABORT(4, "", abort) |
| 348 | : /* gcc asm goto does not allow outputs */ |
| 349 | : [cpu_id] "r" (cpu), |
| 350 | [current_cpu_id] "m" (__rseq_abi.cpu_id), |
| 351 | [rseq_cs] "m" (__rseq_abi.rseq_cs), |
| 352 | /* try store input */ |
| 353 | [v2] "m" (*v2), |
| 354 | [newv2] "r" (newv2), |
| 355 | /* final store input */ |
| 356 | [v] "m" (*v), |
| 357 | [expect] "r" (expect), |
| 358 | [newv] "r" (newv) |
| 359 | RSEQ_INJECT_INPUT |
| 360 | : "memory", "cc", "r0" |
| 361 | RSEQ_INJECT_CLOBBER |
| 362 | : abort, cmpfail |
| 363 | #ifdef RSEQ_COMPARE_TWICE |
| 364 | , error1, error2 |
| 365 | #endif |
| 366 | ); |
| 367 | return 0; |
| 368 | abort: |
| 369 | RSEQ_INJECT_FAILED |
| 370 | return -1; |
| 371 | cmpfail: |
| 372 | return 1; |
| 373 | #ifdef RSEQ_COMPARE_TWICE |
| 374 | error1: |
| 375 | rseq_bug("cpu_id comparison failed"); |
| 376 | error2: |
| 377 | rseq_bug("expected value comparison failed"); |
| 378 | #endif |
| 379 | } |
| 380 | |
| 381 | /* s390 is TSO. */ |
| 382 | static inline __attribute__((always_inline)) |
| 383 | int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect, |
| 384 | intptr_t *v2, intptr_t newv2, |
| 385 | intptr_t newv, int cpu) |
| 386 | { |
| 387 | return rseq_cmpeqv_trystorev_storev(v, expect, v2, newv2, newv, cpu); |
| 388 | } |
| 389 | |
| 390 | static inline __attribute__((always_inline)) |
| 391 | int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect, |
| 392 | intptr_t *v2, intptr_t expect2, |
| 393 | intptr_t newv, int cpu) |
| 394 | { |
| 395 | RSEQ_INJECT_C(9) |
| 396 | |
| 397 | __asm__ __volatile__ goto ( |
| 398 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 399 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
| 400 | #ifdef RSEQ_COMPARE_TWICE |
| 401 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) |
| 402 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) |
| 403 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error3]) |
| 404 | #endif |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 405 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
| 406 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) |
| 407 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) |
| 408 | RSEQ_INJECT_ASM(3) |
| 409 | LONG_CMP " %[expect], %[v]\n\t" |
| 410 | "jnz %l[cmpfail]\n\t" |
| 411 | RSEQ_INJECT_ASM(4) |
| 412 | LONG_CMP " %[expect2], %[v2]\n\t" |
| 413 | "jnz %l[cmpfail]\n\t" |
| 414 | RSEQ_INJECT_ASM(5) |
| 415 | #ifdef RSEQ_COMPARE_TWICE |
| 416 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) |
| 417 | LONG_CMP " %[expect], %[v]\n\t" |
| 418 | "jnz %l[error2]\n\t" |
| 419 | LONG_CMP " %[expect2], %[v2]\n\t" |
| 420 | "jnz %l[error3]\n\t" |
| 421 | #endif |
| 422 | /* final store */ |
| 423 | LONG_S " %[newv], %[v]\n\t" |
| 424 | "2:\n\t" |
| 425 | RSEQ_INJECT_ASM(6) |
| 426 | RSEQ_ASM_DEFINE_ABORT(4, "", abort) |
| 427 | : /* gcc asm goto does not allow outputs */ |
| 428 | : [cpu_id] "r" (cpu), |
| 429 | [current_cpu_id] "m" (__rseq_abi.cpu_id), |
| 430 | [rseq_cs] "m" (__rseq_abi.rseq_cs), |
| 431 | /* cmp2 input */ |
| 432 | [v2] "m" (*v2), |
| 433 | [expect2] "r" (expect2), |
| 434 | /* final store input */ |
| 435 | [v] "m" (*v), |
| 436 | [expect] "r" (expect), |
| 437 | [newv] "r" (newv) |
| 438 | RSEQ_INJECT_INPUT |
| 439 | : "memory", "cc", "r0" |
| 440 | RSEQ_INJECT_CLOBBER |
| 441 | : abort, cmpfail |
| 442 | #ifdef RSEQ_COMPARE_TWICE |
| 443 | , error1, error2, error3 |
| 444 | #endif |
| 445 | ); |
| 446 | return 0; |
| 447 | abort: |
| 448 | RSEQ_INJECT_FAILED |
| 449 | return -1; |
| 450 | cmpfail: |
| 451 | return 1; |
| 452 | #ifdef RSEQ_COMPARE_TWICE |
| 453 | error1: |
| 454 | rseq_bug("cpu_id comparison failed"); |
| 455 | error2: |
| 456 | rseq_bug("1st expected value comparison failed"); |
| 457 | error3: |
| 458 | rseq_bug("2nd expected value comparison failed"); |
| 459 | #endif |
| 460 | } |
| 461 | |
| 462 | static inline __attribute__((always_inline)) |
| 463 | int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect, |
| 464 | void *dst, void *src, size_t len, |
| 465 | intptr_t newv, int cpu) |
| 466 | { |
| 467 | uint64_t rseq_scratch[3]; |
| 468 | |
| 469 | RSEQ_INJECT_C(9) |
| 470 | |
| 471 | __asm__ __volatile__ goto ( |
| 472 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ |
Mathieu Desnoyers | 4fe2088 | 2019-04-29 11:27:53 -0400 | [diff] [blame] | 473 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
| 474 | #ifdef RSEQ_COMPARE_TWICE |
| 475 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) |
| 476 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) |
| 477 | #endif |
Vasily Gorbik | 4c14d1c | 2018-07-09 17:07:48 +0200 | [diff] [blame] | 478 | LONG_S " %[src], %[rseq_scratch0]\n\t" |
| 479 | LONG_S " %[dst], %[rseq_scratch1]\n\t" |
| 480 | LONG_S " %[len], %[rseq_scratch2]\n\t" |
| 481 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
| 482 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) |
| 483 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) |
| 484 | RSEQ_INJECT_ASM(3) |
| 485 | LONG_CMP " %[expect], %[v]\n\t" |
| 486 | "jnz 5f\n\t" |
| 487 | RSEQ_INJECT_ASM(4) |
| 488 | #ifdef RSEQ_COMPARE_TWICE |
| 489 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f) |
| 490 | LONG_CMP " %[expect], %[v]\n\t" |
| 491 | "jnz 7f\n\t" |
| 492 | #endif |
| 493 | /* try memcpy */ |
| 494 | LONG_LT_R " %[len], %[len]\n\t" |
| 495 | "jz 333f\n\t" |
| 496 | "222:\n\t" |
| 497 | "ic %%r0,0(%[src])\n\t" |
| 498 | "stc %%r0,0(%[dst])\n\t" |
| 499 | LONG_ADDI " %[src], 1\n\t" |
| 500 | LONG_ADDI " %[dst], 1\n\t" |
| 501 | LONG_ADDI " %[len], -1\n\t" |
| 502 | "jnz 222b\n\t" |
| 503 | "333:\n\t" |
| 504 | RSEQ_INJECT_ASM(5) |
| 505 | /* final store */ |
| 506 | LONG_S " %[newv], %[v]\n\t" |
| 507 | "2:\n\t" |
| 508 | RSEQ_INJECT_ASM(6) |
| 509 | /* teardown */ |
| 510 | LONG_L " %[len], %[rseq_scratch2]\n\t" |
| 511 | LONG_L " %[dst], %[rseq_scratch1]\n\t" |
| 512 | LONG_L " %[src], %[rseq_scratch0]\n\t" |
| 513 | RSEQ_ASM_DEFINE_ABORT(4, |
| 514 | LONG_L " %[len], %[rseq_scratch2]\n\t" |
| 515 | LONG_L " %[dst], %[rseq_scratch1]\n\t" |
| 516 | LONG_L " %[src], %[rseq_scratch0]\n\t", |
| 517 | abort) |
| 518 | RSEQ_ASM_DEFINE_CMPFAIL(5, |
| 519 | LONG_L " %[len], %[rseq_scratch2]\n\t" |
| 520 | LONG_L " %[dst], %[rseq_scratch1]\n\t" |
| 521 | LONG_L " %[src], %[rseq_scratch0]\n\t", |
| 522 | cmpfail) |
| 523 | #ifdef RSEQ_COMPARE_TWICE |
| 524 | RSEQ_ASM_DEFINE_CMPFAIL(6, |
| 525 | LONG_L " %[len], %[rseq_scratch2]\n\t" |
| 526 | LONG_L " %[dst], %[rseq_scratch1]\n\t" |
| 527 | LONG_L " %[src], %[rseq_scratch0]\n\t", |
| 528 | error1) |
| 529 | RSEQ_ASM_DEFINE_CMPFAIL(7, |
| 530 | LONG_L " %[len], %[rseq_scratch2]\n\t" |
| 531 | LONG_L " %[dst], %[rseq_scratch1]\n\t" |
| 532 | LONG_L " %[src], %[rseq_scratch0]\n\t", |
| 533 | error2) |
| 534 | #endif |
| 535 | : /* gcc asm goto does not allow outputs */ |
| 536 | : [cpu_id] "r" (cpu), |
| 537 | [current_cpu_id] "m" (__rseq_abi.cpu_id), |
| 538 | [rseq_cs] "m" (__rseq_abi.rseq_cs), |
| 539 | /* final store input */ |
| 540 | [v] "m" (*v), |
| 541 | [expect] "r" (expect), |
| 542 | [newv] "r" (newv), |
| 543 | /* try memcpy input */ |
| 544 | [dst] "r" (dst), |
| 545 | [src] "r" (src), |
| 546 | [len] "r" (len), |
| 547 | [rseq_scratch0] "m" (rseq_scratch[0]), |
| 548 | [rseq_scratch1] "m" (rseq_scratch[1]), |
| 549 | [rseq_scratch2] "m" (rseq_scratch[2]) |
| 550 | RSEQ_INJECT_INPUT |
| 551 | : "memory", "cc", "r0" |
| 552 | RSEQ_INJECT_CLOBBER |
| 553 | : abort, cmpfail |
| 554 | #ifdef RSEQ_COMPARE_TWICE |
| 555 | , error1, error2 |
| 556 | #endif |
| 557 | ); |
| 558 | return 0; |
| 559 | abort: |
| 560 | RSEQ_INJECT_FAILED |
| 561 | return -1; |
| 562 | cmpfail: |
| 563 | return 1; |
| 564 | #ifdef RSEQ_COMPARE_TWICE |
| 565 | error1: |
| 566 | rseq_bug("cpu_id comparison failed"); |
| 567 | error2: |
| 568 | rseq_bug("expected value comparison failed"); |
| 569 | #endif |
| 570 | } |
| 571 | |
| 572 | /* s390 is TSO. */ |
| 573 | static inline __attribute__((always_inline)) |
| 574 | int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect, |
| 575 | void *dst, void *src, size_t len, |
| 576 | intptr_t newv, int cpu) |
| 577 | { |
| 578 | return rseq_cmpeqv_trymemcpy_storev(v, expect, dst, src, len, |
| 579 | newv, cpu); |
| 580 | } |
| 581 | #endif /* !RSEQ_SKIP_FASTPATH */ |