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744d0b8b | 1 | /* SPDX-License-Identifier: LGPL-2.1-only OR MIT */ |
784b0012 MD |
2 | /* |
3 | * rseq-ppc.h | |
4 | * | |
5 | * (C) Copyright 2016-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
6 | * (C) Copyright 2016-2018 - Boqun Feng <boqun.feng@gmail.com> | |
7 | */ | |
8 | ||
0158e666 MD |
9 | /* |
10 | * RSEQ_SIG is used with the following trap instruction: | |
11 | * | |
12 | * powerpc-be: 0f e5 00 0b twui r5,11 | |
13 | * powerpc64-le: 0b 00 e5 0f twui r5,11 | |
14 | * powerpc64-be: 0f e5 00 0b twui r5,11 | |
15 | */ | |
16 | ||
17 | #define RSEQ_SIG 0x0fe5000b | |
784b0012 MD |
18 | |
19 | #define rseq_smp_mb() __asm__ __volatile__ ("sync" ::: "memory", "cc") | |
20 | #define rseq_smp_lwsync() __asm__ __volatile__ ("lwsync" ::: "memory", "cc") | |
21 | #define rseq_smp_rmb() rseq_smp_lwsync() | |
22 | #define rseq_smp_wmb() rseq_smp_lwsync() | |
23 | ||
24 | #define rseq_smp_load_acquire(p) \ | |
25 | __extension__ ({ \ | |
26 | __typeof(*p) ____p1 = RSEQ_READ_ONCE(*p); \ | |
27 | rseq_smp_lwsync(); \ | |
28 | ____p1; \ | |
29 | }) | |
30 | ||
31 | #define rseq_smp_acquire__after_ctrl_dep() rseq_smp_lwsync() | |
32 | ||
33 | #define rseq_smp_store_release(p, v) \ | |
34 | do { \ | |
35 | rseq_smp_lwsync(); \ | |
36 | RSEQ_WRITE_ONCE(*p, v); \ | |
37 | } while (0) | |
38 | ||
39 | #ifdef RSEQ_SKIP_FASTPATH | |
40 | #include "rseq-skip.h" | |
41 | #else /* !RSEQ_SKIP_FASTPATH */ | |
42 | ||
43 | /* | |
dd01d0fb MD |
44 | * The __rseq_cs_ptr_array and __rseq_cs sections can be used by debuggers to |
45 | * better handle single-stepping through the restartable critical sections. | |
784b0012 MD |
46 | */ |
47 | ||
48 | #ifdef __PPC64__ | |
49 | ||
a799a7ba MD |
50 | #define RSEQ_STORE_LONG(arg) "std%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* To memory ("m" constraint) */ |
51 | #define RSEQ_STORE_INT(arg) "stw%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* To memory ("m" constraint) */ | |
52 | #define RSEQ_LOAD_LONG(arg) "ld%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* From memory ("m" constraint) */ | |
53 | #define RSEQ_LOAD_INT(arg) "lwz%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* From memory ("m" constraint) */ | |
54 | #define RSEQ_LOADX_LONG "ldx " /* From base register ("b" constraint) */ | |
55 | #define RSEQ_CMP_LONG "cmpd " | |
784b0012 MD |
56 | |
57 | #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \ | |
58 | start_ip, post_commit_offset, abort_ip) \ | |
dd01d0fb | 59 | ".pushsection __rseq_cs, \"aw\"\n\t" \ |
784b0012 MD |
60 | ".balign 32\n\t" \ |
61 | __rseq_str(label) ":\n\t" \ | |
62 | ".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \ | |
63 | ".quad " __rseq_str(start_ip) ", " __rseq_str(post_commit_offset) ", " __rseq_str(abort_ip) "\n\t" \ | |
dd01d0fb MD |
64 | ".popsection\n\t" \ |
65 | ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \ | |
66 | ".quad " __rseq_str(label) "b\n\t" \ | |
784b0012 MD |
67 | ".popsection\n\t" |
68 | ||
69 | #define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \ | |
70 | RSEQ_INJECT_ASM(1) \ | |
71 | "lis %%r17, (" __rseq_str(cs_label) ")@highest\n\t" \ | |
72 | "ori %%r17, %%r17, (" __rseq_str(cs_label) ")@higher\n\t" \ | |
73 | "rldicr %%r17, %%r17, 32, 31\n\t" \ | |
74 | "oris %%r17, %%r17, (" __rseq_str(cs_label) ")@high\n\t" \ | |
75 | "ori %%r17, %%r17, (" __rseq_str(cs_label) ")@l\n\t" \ | |
76 | "std %%r17, %[" __rseq_str(rseq_cs) "]\n\t" \ | |
77 | __rseq_str(label) ":\n\t" | |
78 | ||
90d9876e MD |
79 | /* |
80 | * Exit points of a rseq critical section consist of all instructions outside | |
fd622cad MD |
81 | * of the critical section where a critical section can either branch to or |
82 | * reach through the normal course of its execution. The abort IP and the | |
83 | * post-commit IP are already part of the __rseq_cs section and should not be | |
84 | * explicitly defined as additional exit points. Knowing all exit points is | |
85 | * useful to assist debuggers stepping over the critical section. | |
90d9876e MD |
86 | */ |
87 | #define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \ | |
88 | ".pushsection __rseq_exit_point_array, \"aw\"\n\t" \ | |
89 | ".quad " __rseq_str(start_ip) ", " __rseq_str(exit_ip) "\n\t" \ | |
90 | ".popsection\n\t" | |
91 | ||
784b0012 MD |
92 | #else /* #ifdef __PPC64__ */ |
93 | ||
a799a7ba MD |
94 | #define RSEQ_STORE_LONG(arg) "stw%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* To memory ("m" constraint) */ |
95 | #define RSEQ_STORE_INT(arg) RSEQ_STORE_LONG(arg) /* To memory ("m" constraint) */ | |
96 | #define RSEQ_LOAD_LONG(arg) "lwz%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* From memory ("m" constraint) */ | |
97 | #define RSEQ_LOAD_INT(arg) RSEQ_LOAD_LONG(arg) /* From memory ("m" constraint) */ | |
98 | #define RSEQ_LOADX_LONG "lwzx " /* From base register ("b" constraint) */ | |
99 | #define RSEQ_CMP_LONG "cmpw " | |
784b0012 MD |
100 | |
101 | #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \ | |
102 | start_ip, post_commit_offset, abort_ip) \ | |
dd01d0fb | 103 | ".pushsection __rseq_cs, \"aw\"\n\t" \ |
784b0012 MD |
104 | ".balign 32\n\t" \ |
105 | __rseq_str(label) ":\n\t" \ | |
106 | ".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \ | |
107 | /* 32-bit only supported on BE */ \ | |
108 | ".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) "\n\t" \ | |
dd01d0fb MD |
109 | ".popsection\n\t" \ |
110 | ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \ | |
111 | ".long 0x0, " __rseq_str(label) "b\n\t" \ | |
784b0012 MD |
112 | ".popsection\n\t" |
113 | ||
90d9876e MD |
114 | /* |
115 | * Exit points of a rseq critical section consist of all instructions outside | |
fd622cad MD |
116 | * of the critical section where a critical section can either branch to or |
117 | * reach through the normal course of its execution. The abort IP and the | |
118 | * post-commit IP are already part of the __rseq_cs section and should not be | |
119 | * explicitly defined as additional exit points. Knowing all exit points is | |
120 | * useful to assist debuggers stepping over the critical section. | |
90d9876e MD |
121 | */ |
122 | #define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \ | |
123 | ".pushsection __rseq_exit_point_array, \"aw\"\n\t" \ | |
124 | /* 32-bit only supported on BE */ \ | |
125 | ".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(exit_ip) "\n\t" \ | |
126 | ".popsection\n\t" | |
127 | ||
784b0012 MD |
128 | #define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \ |
129 | RSEQ_INJECT_ASM(1) \ | |
130 | "lis %%r17, (" __rseq_str(cs_label) ")@ha\n\t" \ | |
131 | "addi %%r17, %%r17, (" __rseq_str(cs_label) ")@l\n\t" \ | |
a799a7ba | 132 | RSEQ_STORE_INT(rseq_cs) "%%r17, %[" __rseq_str(rseq_cs) "]\n\t" \ |
784b0012 MD |
133 | __rseq_str(label) ":\n\t" |
134 | ||
135 | #endif /* #ifdef __PPC64__ */ | |
136 | ||
137 | #define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \ | |
138 | __RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \ | |
139 | (post_commit_ip - start_ip), abort_ip) | |
140 | ||
141 | #define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \ | |
142 | RSEQ_INJECT_ASM(2) \ | |
a799a7ba | 143 | RSEQ_LOAD_INT(current_cpu_id) "%%r17, %[" __rseq_str(current_cpu_id) "]\n\t" \ |
784b0012 MD |
144 | "cmpw cr7, %[" __rseq_str(cpu_id) "], %%r17\n\t" \ |
145 | "bne- cr7, " __rseq_str(label) "\n\t" | |
146 | ||
147 | #define RSEQ_ASM_DEFINE_ABORT(label, abort_label) \ | |
148 | ".pushsection __rseq_failure, \"ax\"\n\t" \ | |
149 | ".long " __rseq_str(RSEQ_SIG) "\n\t" \ | |
150 | __rseq_str(label) ":\n\t" \ | |
151 | "b %l[" __rseq_str(abort_label) "]\n\t" \ | |
152 | ".popsection\n\t" | |
153 | ||
154 | /* | |
155 | * RSEQ_ASM_OPs: asm operations for rseq | |
156 | * RSEQ_ASM_OP_R_*: has hard-code registers in it | |
157 | * RSEQ_ASM_OP_* (else): doesn't have hard-code registers(unless cr7) | |
158 | */ | |
159 | #define RSEQ_ASM_OP_CMPEQ(var, expect, label) \ | |
a799a7ba MD |
160 | RSEQ_LOAD_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" \ |
161 | RSEQ_CMP_LONG "cr7, %%r17, %[" __rseq_str(expect) "]\n\t" \ | |
784b0012 MD |
162 | "bne- cr7, " __rseq_str(label) "\n\t" |
163 | ||
164 | #define RSEQ_ASM_OP_CMPNE(var, expectnot, label) \ | |
a799a7ba MD |
165 | RSEQ_LOAD_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" \ |
166 | RSEQ_CMP_LONG "cr7, %%r17, %[" __rseq_str(expectnot) "]\n\t" \ | |
784b0012 MD |
167 | "beq- cr7, " __rseq_str(label) "\n\t" |
168 | ||
169 | #define RSEQ_ASM_OP_STORE(value, var) \ | |
a799a7ba | 170 | RSEQ_STORE_LONG(var) "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t" |
784b0012 MD |
171 | |
172 | /* Load @var to r17 */ | |
173 | #define RSEQ_ASM_OP_R_LOAD(var) \ | |
a799a7ba | 174 | RSEQ_LOAD_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" |
784b0012 MD |
175 | |
176 | /* Store r17 to @var */ | |
177 | #define RSEQ_ASM_OP_R_STORE(var) \ | |
a799a7ba | 178 | RSEQ_STORE_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" |
784b0012 MD |
179 | |
180 | /* Add @count to r17 */ | |
181 | #define RSEQ_ASM_OP_R_ADD(count) \ | |
182 | "add %%r17, %[" __rseq_str(count) "], %%r17\n\t" | |
183 | ||
184 | /* Load (r17 + voffp) to r17 */ | |
185 | #define RSEQ_ASM_OP_R_LOADX(voffp) \ | |
a799a7ba | 186 | RSEQ_LOADX_LONG "%%r17, %[" __rseq_str(voffp) "], %%r17\n\t" |
784b0012 MD |
187 | |
188 | /* TODO: implement a faster memcpy. */ | |
189 | #define RSEQ_ASM_OP_R_MEMCPY() \ | |
190 | "cmpdi %%r19, 0\n\t" \ | |
191 | "beq 333f\n\t" \ | |
192 | "addi %%r20, %%r20, -1\n\t" \ | |
193 | "addi %%r21, %%r21, -1\n\t" \ | |
194 | "222:\n\t" \ | |
195 | "lbzu %%r18, 1(%%r20)\n\t" \ | |
196 | "stbu %%r18, 1(%%r21)\n\t" \ | |
197 | "addi %%r19, %%r19, -1\n\t" \ | |
198 | "cmpdi %%r19, 0\n\t" \ | |
199 | "bne 222b\n\t" \ | |
200 | "333:\n\t" \ | |
201 | ||
202 | #define RSEQ_ASM_OP_R_FINAL_STORE(var, post_commit_label) \ | |
a799a7ba | 203 | RSEQ_STORE_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" \ |
784b0012 MD |
204 | __rseq_str(post_commit_label) ":\n\t" |
205 | ||
206 | #define RSEQ_ASM_OP_FINAL_STORE(value, var, post_commit_label) \ | |
a799a7ba | 207 | RSEQ_STORE_LONG(var) "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t" \ |
784b0012 MD |
208 | __rseq_str(post_commit_label) ":\n\t" |
209 | ||
210 | static inline __attribute__((always_inline)) | |
211 | int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu) | |
212 | { | |
213 | RSEQ_INJECT_C(9) | |
214 | ||
215 | __asm__ __volatile__ goto ( | |
216 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ | |
90d9876e MD |
217 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
218 | #ifdef RSEQ_COMPARE_TWICE | |
219 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) | |
220 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) | |
221 | #endif | |
784b0012 MD |
222 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
223 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) | |
224 | /* cmp cpuid */ | |
225 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) | |
226 | RSEQ_INJECT_ASM(3) | |
227 | /* cmp @v equal to @expect */ | |
228 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) | |
229 | RSEQ_INJECT_ASM(4) | |
230 | #ifdef RSEQ_COMPARE_TWICE | |
231 | /* cmp cpuid */ | |
232 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) | |
233 | /* cmp @v equal to @expect */ | |
234 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) | |
235 | #endif | |
236 | /* final store */ | |
237 | RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) | |
238 | RSEQ_INJECT_ASM(5) | |
239 | RSEQ_ASM_DEFINE_ABORT(4, abort) | |
240 | : /* gcc asm goto does not allow outputs */ | |
241 | : [cpu_id] "r" (cpu), | |
9698c399 MD |
242 | [current_cpu_id] "m" (rseq_get_abi()->cpu_id), |
243 | [rseq_cs] "m" (rseq_get_abi()->rseq_cs), | |
784b0012 MD |
244 | [v] "m" (*v), |
245 | [expect] "r" (expect), | |
246 | [newv] "r" (newv) | |
247 | RSEQ_INJECT_INPUT | |
248 | : "memory", "cc", "r17" | |
249 | RSEQ_INJECT_CLOBBER | |
250 | : abort, cmpfail | |
251 | #ifdef RSEQ_COMPARE_TWICE | |
252 | , error1, error2 | |
253 | #endif | |
254 | ); | |
dd76f2d6 | 255 | rseq_after_asm_goto(); |
784b0012 MD |
256 | return 0; |
257 | abort: | |
dd76f2d6 | 258 | rseq_after_asm_goto(); |
784b0012 MD |
259 | RSEQ_INJECT_FAILED |
260 | return -1; | |
261 | cmpfail: | |
dd76f2d6 | 262 | rseq_after_asm_goto(); |
784b0012 MD |
263 | return 1; |
264 | #ifdef RSEQ_COMPARE_TWICE | |
265 | error1: | |
dd76f2d6 | 266 | rseq_after_asm_goto(); |
784b0012 MD |
267 | rseq_bug("cpu_id comparison failed"); |
268 | error2: | |
dd76f2d6 | 269 | rseq_after_asm_goto(); |
784b0012 MD |
270 | rseq_bug("expected value comparison failed"); |
271 | #endif | |
272 | } | |
273 | ||
274 | static inline __attribute__((always_inline)) | |
275 | int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot, | |
276 | off_t voffp, intptr_t *load, int cpu) | |
277 | { | |
278 | RSEQ_INJECT_C(9) | |
279 | ||
280 | __asm__ __volatile__ goto ( | |
281 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ | |
90d9876e MD |
282 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
283 | #ifdef RSEQ_COMPARE_TWICE | |
284 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) | |
285 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) | |
286 | #endif | |
784b0012 MD |
287 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
288 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) | |
289 | /* cmp cpuid */ | |
290 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) | |
291 | RSEQ_INJECT_ASM(3) | |
292 | /* cmp @v not equal to @expectnot */ | |
293 | RSEQ_ASM_OP_CMPNE(v, expectnot, %l[cmpfail]) | |
294 | RSEQ_INJECT_ASM(4) | |
295 | #ifdef RSEQ_COMPARE_TWICE | |
296 | /* cmp cpuid */ | |
297 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) | |
298 | /* cmp @v not equal to @expectnot */ | |
299 | RSEQ_ASM_OP_CMPNE(v, expectnot, %l[error2]) | |
300 | #endif | |
301 | /* load the value of @v */ | |
302 | RSEQ_ASM_OP_R_LOAD(v) | |
303 | /* store it in @load */ | |
304 | RSEQ_ASM_OP_R_STORE(load) | |
305 | /* dereference voffp(v) */ | |
306 | RSEQ_ASM_OP_R_LOADX(voffp) | |
307 | /* final store the value at voffp(v) */ | |
308 | RSEQ_ASM_OP_R_FINAL_STORE(v, 2) | |
309 | RSEQ_INJECT_ASM(5) | |
310 | RSEQ_ASM_DEFINE_ABORT(4, abort) | |
311 | : /* gcc asm goto does not allow outputs */ | |
312 | : [cpu_id] "r" (cpu), | |
9698c399 MD |
313 | [current_cpu_id] "m" (rseq_get_abi()->cpu_id), |
314 | [rseq_cs] "m" (rseq_get_abi()->rseq_cs), | |
784b0012 MD |
315 | /* final store input */ |
316 | [v] "m" (*v), | |
317 | [expectnot] "r" (expectnot), | |
318 | [voffp] "b" (voffp), | |
319 | [load] "m" (*load) | |
320 | RSEQ_INJECT_INPUT | |
321 | : "memory", "cc", "r17" | |
322 | RSEQ_INJECT_CLOBBER | |
323 | : abort, cmpfail | |
324 | #ifdef RSEQ_COMPARE_TWICE | |
325 | , error1, error2 | |
326 | #endif | |
327 | ); | |
dd76f2d6 | 328 | rseq_after_asm_goto(); |
784b0012 MD |
329 | return 0; |
330 | abort: | |
dd76f2d6 | 331 | rseq_after_asm_goto(); |
784b0012 MD |
332 | RSEQ_INJECT_FAILED |
333 | return -1; | |
334 | cmpfail: | |
dd76f2d6 | 335 | rseq_after_asm_goto(); |
784b0012 MD |
336 | return 1; |
337 | #ifdef RSEQ_COMPARE_TWICE | |
338 | error1: | |
dd76f2d6 | 339 | rseq_after_asm_goto(); |
784b0012 MD |
340 | rseq_bug("cpu_id comparison failed"); |
341 | error2: | |
dd76f2d6 | 342 | rseq_after_asm_goto(); |
784b0012 MD |
343 | rseq_bug("expected value comparison failed"); |
344 | #endif | |
345 | } | |
346 | ||
347 | static inline __attribute__((always_inline)) | |
348 | int rseq_addv(intptr_t *v, intptr_t count, int cpu) | |
349 | { | |
350 | RSEQ_INJECT_C(9) | |
351 | ||
352 | __asm__ __volatile__ goto ( | |
353 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ | |
90d9876e MD |
354 | #ifdef RSEQ_COMPARE_TWICE |
355 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) | |
356 | #endif | |
784b0012 MD |
357 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
358 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) | |
359 | /* cmp cpuid */ | |
360 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) | |
361 | RSEQ_INJECT_ASM(3) | |
362 | #ifdef RSEQ_COMPARE_TWICE | |
363 | /* cmp cpuid */ | |
364 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) | |
365 | #endif | |
366 | /* load the value of @v */ | |
367 | RSEQ_ASM_OP_R_LOAD(v) | |
368 | /* add @count to it */ | |
369 | RSEQ_ASM_OP_R_ADD(count) | |
370 | /* final store */ | |
371 | RSEQ_ASM_OP_R_FINAL_STORE(v, 2) | |
372 | RSEQ_INJECT_ASM(4) | |
373 | RSEQ_ASM_DEFINE_ABORT(4, abort) | |
374 | : /* gcc asm goto does not allow outputs */ | |
375 | : [cpu_id] "r" (cpu), | |
9698c399 MD |
376 | [current_cpu_id] "m" (rseq_get_abi()->cpu_id), |
377 | [rseq_cs] "m" (rseq_get_abi()->rseq_cs), | |
784b0012 MD |
378 | /* final store input */ |
379 | [v] "m" (*v), | |
380 | [count] "r" (count) | |
381 | RSEQ_INJECT_INPUT | |
382 | : "memory", "cc", "r17" | |
383 | RSEQ_INJECT_CLOBBER | |
384 | : abort | |
385 | #ifdef RSEQ_COMPARE_TWICE | |
386 | , error1 | |
387 | #endif | |
388 | ); | |
dd76f2d6 | 389 | rseq_after_asm_goto(); |
784b0012 MD |
390 | return 0; |
391 | abort: | |
dd76f2d6 | 392 | rseq_after_asm_goto(); |
784b0012 MD |
393 | RSEQ_INJECT_FAILED |
394 | return -1; | |
395 | #ifdef RSEQ_COMPARE_TWICE | |
396 | error1: | |
dd76f2d6 | 397 | rseq_after_asm_goto(); |
784b0012 MD |
398 | rseq_bug("cpu_id comparison failed"); |
399 | #endif | |
400 | } | |
401 | ||
402 | static inline __attribute__((always_inline)) | |
403 | int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect, | |
404 | intptr_t *v2, intptr_t newv2, | |
405 | intptr_t newv, int cpu) | |
406 | { | |
407 | RSEQ_INJECT_C(9) | |
408 | ||
409 | __asm__ __volatile__ goto ( | |
410 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ | |
90d9876e MD |
411 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
412 | #ifdef RSEQ_COMPARE_TWICE | |
413 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) | |
414 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) | |
415 | #endif | |
784b0012 MD |
416 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
417 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) | |
418 | /* cmp cpuid */ | |
419 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) | |
420 | RSEQ_INJECT_ASM(3) | |
421 | /* cmp @v equal to @expect */ | |
422 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) | |
423 | RSEQ_INJECT_ASM(4) | |
424 | #ifdef RSEQ_COMPARE_TWICE | |
425 | /* cmp cpuid */ | |
426 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) | |
427 | /* cmp @v equal to @expect */ | |
428 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) | |
429 | #endif | |
430 | /* try store */ | |
431 | RSEQ_ASM_OP_STORE(newv2, v2) | |
432 | RSEQ_INJECT_ASM(5) | |
433 | /* final store */ | |
434 | RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) | |
435 | RSEQ_INJECT_ASM(6) | |
436 | RSEQ_ASM_DEFINE_ABORT(4, abort) | |
437 | : /* gcc asm goto does not allow outputs */ | |
438 | : [cpu_id] "r" (cpu), | |
9698c399 MD |
439 | [current_cpu_id] "m" (rseq_get_abi()->cpu_id), |
440 | [rseq_cs] "m" (rseq_get_abi()->rseq_cs), | |
784b0012 MD |
441 | /* try store input */ |
442 | [v2] "m" (*v2), | |
443 | [newv2] "r" (newv2), | |
444 | /* final store input */ | |
445 | [v] "m" (*v), | |
446 | [expect] "r" (expect), | |
447 | [newv] "r" (newv) | |
448 | RSEQ_INJECT_INPUT | |
449 | : "memory", "cc", "r17" | |
450 | RSEQ_INJECT_CLOBBER | |
451 | : abort, cmpfail | |
452 | #ifdef RSEQ_COMPARE_TWICE | |
453 | , error1, error2 | |
454 | #endif | |
455 | ); | |
dd76f2d6 | 456 | rseq_after_asm_goto(); |
784b0012 MD |
457 | return 0; |
458 | abort: | |
dd76f2d6 | 459 | rseq_after_asm_goto(); |
784b0012 MD |
460 | RSEQ_INJECT_FAILED |
461 | return -1; | |
462 | cmpfail: | |
dd76f2d6 | 463 | rseq_after_asm_goto(); |
784b0012 MD |
464 | return 1; |
465 | #ifdef RSEQ_COMPARE_TWICE | |
466 | error1: | |
dd76f2d6 | 467 | rseq_after_asm_goto(); |
784b0012 MD |
468 | rseq_bug("cpu_id comparison failed"); |
469 | error2: | |
dd76f2d6 | 470 | rseq_after_asm_goto(); |
784b0012 MD |
471 | rseq_bug("expected value comparison failed"); |
472 | #endif | |
473 | } | |
474 | ||
475 | static inline __attribute__((always_inline)) | |
476 | int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect, | |
477 | intptr_t *v2, intptr_t newv2, | |
478 | intptr_t newv, int cpu) | |
479 | { | |
480 | RSEQ_INJECT_C(9) | |
481 | ||
482 | __asm__ __volatile__ goto ( | |
483 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ | |
90d9876e MD |
484 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
485 | #ifdef RSEQ_COMPARE_TWICE | |
486 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) | |
487 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) | |
488 | #endif | |
784b0012 MD |
489 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
490 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) | |
491 | /* cmp cpuid */ | |
492 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) | |
493 | RSEQ_INJECT_ASM(3) | |
494 | /* cmp @v equal to @expect */ | |
495 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) | |
496 | RSEQ_INJECT_ASM(4) | |
497 | #ifdef RSEQ_COMPARE_TWICE | |
498 | /* cmp cpuid */ | |
499 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) | |
500 | /* cmp @v equal to @expect */ | |
501 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) | |
502 | #endif | |
503 | /* try store */ | |
504 | RSEQ_ASM_OP_STORE(newv2, v2) | |
505 | RSEQ_INJECT_ASM(5) | |
506 | /* for 'release' */ | |
507 | "lwsync\n\t" | |
508 | /* final store */ | |
509 | RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) | |
510 | RSEQ_INJECT_ASM(6) | |
511 | RSEQ_ASM_DEFINE_ABORT(4, abort) | |
512 | : /* gcc asm goto does not allow outputs */ | |
513 | : [cpu_id] "r" (cpu), | |
9698c399 MD |
514 | [current_cpu_id] "m" (rseq_get_abi()->cpu_id), |
515 | [rseq_cs] "m" (rseq_get_abi()->rseq_cs), | |
784b0012 MD |
516 | /* try store input */ |
517 | [v2] "m" (*v2), | |
518 | [newv2] "r" (newv2), | |
519 | /* final store input */ | |
520 | [v] "m" (*v), | |
521 | [expect] "r" (expect), | |
522 | [newv] "r" (newv) | |
523 | RSEQ_INJECT_INPUT | |
524 | : "memory", "cc", "r17" | |
525 | RSEQ_INJECT_CLOBBER | |
526 | : abort, cmpfail | |
527 | #ifdef RSEQ_COMPARE_TWICE | |
528 | , error1, error2 | |
529 | #endif | |
530 | ); | |
dd76f2d6 | 531 | rseq_after_asm_goto(); |
784b0012 MD |
532 | return 0; |
533 | abort: | |
dd76f2d6 | 534 | rseq_after_asm_goto(); |
784b0012 MD |
535 | RSEQ_INJECT_FAILED |
536 | return -1; | |
537 | cmpfail: | |
dd76f2d6 | 538 | rseq_after_asm_goto(); |
784b0012 MD |
539 | return 1; |
540 | #ifdef RSEQ_COMPARE_TWICE | |
541 | error1: | |
dd76f2d6 | 542 | rseq_after_asm_goto(); |
784b0012 MD |
543 | rseq_bug("cpu_id comparison failed"); |
544 | error2: | |
dd76f2d6 | 545 | rseq_after_asm_goto(); |
784b0012 MD |
546 | rseq_bug("expected value comparison failed"); |
547 | #endif | |
548 | } | |
549 | ||
550 | static inline __attribute__((always_inline)) | |
551 | int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect, | |
552 | intptr_t *v2, intptr_t expect2, | |
553 | intptr_t newv, int cpu) | |
554 | { | |
555 | RSEQ_INJECT_C(9) | |
556 | ||
557 | __asm__ __volatile__ goto ( | |
558 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ | |
90d9876e MD |
559 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
560 | #ifdef RSEQ_COMPARE_TWICE | |
561 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) | |
562 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) | |
563 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error3]) | |
564 | #endif | |
784b0012 MD |
565 | /* Start rseq by storing table entry pointer into rseq_cs. */ |
566 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) | |
567 | /* cmp cpuid */ | |
568 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) | |
569 | RSEQ_INJECT_ASM(3) | |
570 | /* cmp @v equal to @expect */ | |
571 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) | |
572 | RSEQ_INJECT_ASM(4) | |
573 | /* cmp @v2 equal to @expct2 */ | |
574 | RSEQ_ASM_OP_CMPEQ(v2, expect2, %l[cmpfail]) | |
575 | RSEQ_INJECT_ASM(5) | |
576 | #ifdef RSEQ_COMPARE_TWICE | |
577 | /* cmp cpuid */ | |
578 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) | |
579 | /* cmp @v equal to @expect */ | |
580 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) | |
581 | /* cmp @v2 equal to @expct2 */ | |
582 | RSEQ_ASM_OP_CMPEQ(v2, expect2, %l[error3]) | |
583 | #endif | |
584 | /* final store */ | |
585 | RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) | |
586 | RSEQ_INJECT_ASM(6) | |
587 | RSEQ_ASM_DEFINE_ABORT(4, abort) | |
588 | : /* gcc asm goto does not allow outputs */ | |
589 | : [cpu_id] "r" (cpu), | |
9698c399 MD |
590 | [current_cpu_id] "m" (rseq_get_abi()->cpu_id), |
591 | [rseq_cs] "m" (rseq_get_abi()->rseq_cs), | |
784b0012 MD |
592 | /* cmp2 input */ |
593 | [v2] "m" (*v2), | |
594 | [expect2] "r" (expect2), | |
595 | /* final store input */ | |
596 | [v] "m" (*v), | |
597 | [expect] "r" (expect), | |
598 | [newv] "r" (newv) | |
599 | RSEQ_INJECT_INPUT | |
600 | : "memory", "cc", "r17" | |
601 | RSEQ_INJECT_CLOBBER | |
602 | : abort, cmpfail | |
603 | #ifdef RSEQ_COMPARE_TWICE | |
604 | , error1, error2, error3 | |
605 | #endif | |
606 | ); | |
dd76f2d6 | 607 | rseq_after_asm_goto(); |
784b0012 MD |
608 | return 0; |
609 | abort: | |
dd76f2d6 | 610 | rseq_after_asm_goto(); |
784b0012 MD |
611 | RSEQ_INJECT_FAILED |
612 | return -1; | |
613 | cmpfail: | |
dd76f2d6 | 614 | rseq_after_asm_goto(); |
784b0012 MD |
615 | return 1; |
616 | #ifdef RSEQ_COMPARE_TWICE | |
617 | error1: | |
dd76f2d6 | 618 | rseq_after_asm_goto(); |
784b0012 MD |
619 | rseq_bug("cpu_id comparison failed"); |
620 | error2: | |
dd76f2d6 | 621 | rseq_after_asm_goto(); |
784b0012 MD |
622 | rseq_bug("1st expected value comparison failed"); |
623 | error3: | |
dd76f2d6 | 624 | rseq_after_asm_goto(); |
784b0012 MD |
625 | rseq_bug("2nd expected value comparison failed"); |
626 | #endif | |
627 | } | |
628 | ||
629 | static inline __attribute__((always_inline)) | |
630 | int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect, | |
631 | void *dst, void *src, size_t len, | |
632 | intptr_t newv, int cpu) | |
633 | { | |
634 | RSEQ_INJECT_C(9) | |
635 | ||
636 | __asm__ __volatile__ goto ( | |
637 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ | |
90d9876e MD |
638 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
639 | #ifdef RSEQ_COMPARE_TWICE | |
640 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) | |
641 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) | |
642 | #endif | |
784b0012 MD |
643 | /* setup for mempcy */ |
644 | "mr %%r19, %[len]\n\t" | |
645 | "mr %%r20, %[src]\n\t" | |
646 | "mr %%r21, %[dst]\n\t" | |
647 | /* Start rseq by storing table entry pointer into rseq_cs. */ | |
648 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) | |
649 | /* cmp cpuid */ | |
650 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) | |
651 | RSEQ_INJECT_ASM(3) | |
652 | /* cmp @v equal to @expect */ | |
653 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) | |
654 | RSEQ_INJECT_ASM(4) | |
655 | #ifdef RSEQ_COMPARE_TWICE | |
656 | /* cmp cpuid */ | |
657 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) | |
658 | /* cmp @v equal to @expect */ | |
659 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) | |
660 | #endif | |
661 | /* try memcpy */ | |
662 | RSEQ_ASM_OP_R_MEMCPY() | |
663 | RSEQ_INJECT_ASM(5) | |
664 | /* final store */ | |
665 | RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) | |
666 | RSEQ_INJECT_ASM(6) | |
667 | /* teardown */ | |
668 | RSEQ_ASM_DEFINE_ABORT(4, abort) | |
669 | : /* gcc asm goto does not allow outputs */ | |
670 | : [cpu_id] "r" (cpu), | |
9698c399 MD |
671 | [current_cpu_id] "m" (rseq_get_abi()->cpu_id), |
672 | [rseq_cs] "m" (rseq_get_abi()->rseq_cs), | |
784b0012 MD |
673 | /* final store input */ |
674 | [v] "m" (*v), | |
675 | [expect] "r" (expect), | |
676 | [newv] "r" (newv), | |
677 | /* try memcpy input */ | |
678 | [dst] "r" (dst), | |
679 | [src] "r" (src), | |
680 | [len] "r" (len) | |
681 | RSEQ_INJECT_INPUT | |
682 | : "memory", "cc", "r17", "r18", "r19", "r20", "r21" | |
683 | RSEQ_INJECT_CLOBBER | |
684 | : abort, cmpfail | |
685 | #ifdef RSEQ_COMPARE_TWICE | |
686 | , error1, error2 | |
687 | #endif | |
688 | ); | |
dd76f2d6 | 689 | rseq_after_asm_goto(); |
784b0012 MD |
690 | return 0; |
691 | abort: | |
dd76f2d6 | 692 | rseq_after_asm_goto(); |
784b0012 MD |
693 | RSEQ_INJECT_FAILED |
694 | return -1; | |
695 | cmpfail: | |
dd76f2d6 | 696 | rseq_after_asm_goto(); |
784b0012 MD |
697 | return 1; |
698 | #ifdef RSEQ_COMPARE_TWICE | |
699 | error1: | |
dd76f2d6 | 700 | rseq_after_asm_goto(); |
784b0012 MD |
701 | rseq_bug("cpu_id comparison failed"); |
702 | error2: | |
dd76f2d6 | 703 | rseq_after_asm_goto(); |
784b0012 MD |
704 | rseq_bug("expected value comparison failed"); |
705 | #endif | |
706 | } | |
707 | ||
708 | static inline __attribute__((always_inline)) | |
709 | int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect, | |
710 | void *dst, void *src, size_t len, | |
711 | intptr_t newv, int cpu) | |
712 | { | |
713 | RSEQ_INJECT_C(9) | |
714 | ||
715 | __asm__ __volatile__ goto ( | |
716 | RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ | |
90d9876e MD |
717 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) |
718 | #ifdef RSEQ_COMPARE_TWICE | |
719 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) | |
720 | RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) | |
721 | #endif | |
784b0012 MD |
722 | /* setup for mempcy */ |
723 | "mr %%r19, %[len]\n\t" | |
724 | "mr %%r20, %[src]\n\t" | |
725 | "mr %%r21, %[dst]\n\t" | |
726 | /* Start rseq by storing table entry pointer into rseq_cs. */ | |
727 | RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) | |
728 | /* cmp cpuid */ | |
729 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) | |
730 | RSEQ_INJECT_ASM(3) | |
731 | /* cmp @v equal to @expect */ | |
732 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) | |
733 | RSEQ_INJECT_ASM(4) | |
734 | #ifdef RSEQ_COMPARE_TWICE | |
735 | /* cmp cpuid */ | |
736 | RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) | |
737 | /* cmp @v equal to @expect */ | |
738 | RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) | |
739 | #endif | |
740 | /* try memcpy */ | |
741 | RSEQ_ASM_OP_R_MEMCPY() | |
742 | RSEQ_INJECT_ASM(5) | |
743 | /* for 'release' */ | |
744 | "lwsync\n\t" | |
745 | /* final store */ | |
746 | RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) | |
747 | RSEQ_INJECT_ASM(6) | |
748 | /* teardown */ | |
749 | RSEQ_ASM_DEFINE_ABORT(4, abort) | |
750 | : /* gcc asm goto does not allow outputs */ | |
751 | : [cpu_id] "r" (cpu), | |
9698c399 MD |
752 | [current_cpu_id] "m" (rseq_get_abi()->cpu_id), |
753 | [rseq_cs] "m" (rseq_get_abi()->rseq_cs), | |
784b0012 MD |
754 | /* final store input */ |
755 | [v] "m" (*v), | |
756 | [expect] "r" (expect), | |
757 | [newv] "r" (newv), | |
758 | /* try memcpy input */ | |
759 | [dst] "r" (dst), | |
760 | [src] "r" (src), | |
761 | [len] "r" (len) | |
762 | RSEQ_INJECT_INPUT | |
763 | : "memory", "cc", "r17", "r18", "r19", "r20", "r21" | |
764 | RSEQ_INJECT_CLOBBER | |
765 | : abort, cmpfail | |
766 | #ifdef RSEQ_COMPARE_TWICE | |
767 | , error1, error2 | |
768 | #endif | |
769 | ); | |
dd76f2d6 | 770 | rseq_after_asm_goto(); |
784b0012 MD |
771 | return 0; |
772 | abort: | |
dd76f2d6 | 773 | rseq_after_asm_goto(); |
784b0012 MD |
774 | RSEQ_INJECT_FAILED |
775 | return -1; | |
776 | cmpfail: | |
dd76f2d6 | 777 | rseq_after_asm_goto(); |
784b0012 MD |
778 | return 1; |
779 | #ifdef RSEQ_COMPARE_TWICE | |
780 | error1: | |
dd76f2d6 | 781 | rseq_after_asm_goto(); |
784b0012 MD |
782 | rseq_bug("cpu_id comparison failed"); |
783 | error2: | |
dd76f2d6 | 784 | rseq_after_asm_goto(); |
784b0012 MD |
785 | rseq_bug("expected value comparison failed"); |
786 | #endif | |
787 | } | |
788 | ||
a799a7ba MD |
789 | #undef RSEQ_STORE_LONG |
790 | #undef RSEQ_LOAD_LONG | |
791 | #undef RSEQ_LOADX_LONG | |
792 | #undef RSEQ_CMP_LONG | |
784b0012 MD |
793 | |
794 | #endif /* !RSEQ_SKIP_FASTPATH */ |