/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ /* * rseq-ppc.h * * (C) Copyright 2016-2018 - Mathieu Desnoyers * (C) Copyright 2016-2018 - Boqun Feng */ #define RSEQ_SIG 0x53053053 #define rseq_smp_mb() __asm__ __volatile__ ("sync" ::: "memory", "cc") #define rseq_smp_lwsync() __asm__ __volatile__ ("lwsync" ::: "memory", "cc") #define rseq_smp_rmb() rseq_smp_lwsync() #define rseq_smp_wmb() rseq_smp_lwsync() #define rseq_smp_load_acquire(p) \ __extension__ ({ \ __typeof(*p) ____p1 = RSEQ_READ_ONCE(*p); \ rseq_smp_lwsync(); \ ____p1; \ }) #define rseq_smp_acquire__after_ctrl_dep() rseq_smp_lwsync() #define rseq_smp_store_release(p, v) \ do { \ rseq_smp_lwsync(); \ RSEQ_WRITE_ONCE(*p, v); \ } while (0) #ifdef RSEQ_SKIP_FASTPATH #include "rseq-skip.h" #else /* !RSEQ_SKIP_FASTPATH */ /* * The __rseq_cs_ptr_array and __rseq_cs sections can be used by debuggers to * better handle single-stepping through the restartable critical sections. */ #ifdef __PPC64__ #define STORE_WORD "std " #define LOAD_WORD "ld " #define LOADX_WORD "ldx " #define CMP_WORD "cmpd " #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \ start_ip, post_commit_offset, abort_ip) \ ".pushsection __rseq_cs, \"aw\"\n\t" \ ".balign 32\n\t" \ __rseq_str(label) ":\n\t" \ ".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \ ".quad " __rseq_str(start_ip) ", " __rseq_str(post_commit_offset) ", " __rseq_str(abort_ip) "\n\t" \ ".popsection\n\t" \ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \ ".quad " __rseq_str(label) "b\n\t" \ ".popsection\n\t" #define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \ RSEQ_INJECT_ASM(1) \ "lis %%r17, (" __rseq_str(cs_label) ")@highest\n\t" \ "ori %%r17, %%r17, (" __rseq_str(cs_label) ")@higher\n\t" \ "rldicr %%r17, %%r17, 32, 31\n\t" \ "oris %%r17, %%r17, (" __rseq_str(cs_label) ")@high\n\t" \ "ori %%r17, %%r17, (" __rseq_str(cs_label) ")@l\n\t" \ "std %%r17, %[" __rseq_str(rseq_cs) "]\n\t" \ __rseq_str(label) ":\n\t" /* * Exit points of a rseq critical section consist of all instructions outside * of the critical section where a critical section can either branch to or * reach through the normal course of its execution. The abort IP and the * post-commit IP are already part of the __rseq_cs section and should not be * explicitly defined as additional exit points. Knowing all exit points is * useful to assist debuggers stepping over the critical section. */ #define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \ ".pushsection __rseq_exit_point_array, \"aw\"\n\t" \ ".quad " __rseq_str(start_ip) ", " __rseq_str(exit_ip) "\n\t" \ ".popsection\n\t" #else /* #ifdef __PPC64__ */ #define STORE_WORD "stw " #define LOAD_WORD "lwz " #define LOADX_WORD "lwzx " #define CMP_WORD "cmpw " #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \ start_ip, post_commit_offset, abort_ip) \ ".pushsection __rseq_cs, \"aw\"\n\t" \ ".balign 32\n\t" \ __rseq_str(label) ":\n\t" \ ".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \ /* 32-bit only supported on BE */ \ ".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) "\n\t" \ ".popsection\n\t" \ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \ ".long 0x0, " __rseq_str(label) "b\n\t" \ ".popsection\n\t" /* * Exit points of a rseq critical section consist of all instructions outside * of the critical section where a critical section can either branch to or * reach through the normal course of its execution. The abort IP and the * post-commit IP are already part of the __rseq_cs section and should not be * explicitly defined as additional exit points. Knowing all exit points is * useful to assist debuggers stepping over the critical section. */ #define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \ ".pushsection __rseq_exit_point_array, \"aw\"\n\t" \ /* 32-bit only supported on BE */ \ ".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(exit_ip) "\n\t" \ ".popsection\n\t" #define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \ RSEQ_INJECT_ASM(1) \ "lis %%r17, (" __rseq_str(cs_label) ")@ha\n\t" \ "addi %%r17, %%r17, (" __rseq_str(cs_label) ")@l\n\t" \ "stw %%r17, %[" __rseq_str(rseq_cs) "]\n\t" \ __rseq_str(label) ":\n\t" #endif /* #ifdef __PPC64__ */ #define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \ __RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \ (post_commit_ip - start_ip), abort_ip) #define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \ RSEQ_INJECT_ASM(2) \ "lwz %%r17, %[" __rseq_str(current_cpu_id) "]\n\t" \ "cmpw cr7, %[" __rseq_str(cpu_id) "], %%r17\n\t" \ "bne- cr7, " __rseq_str(label) "\n\t" #define RSEQ_ASM_DEFINE_ABORT(label, abort_label) \ ".pushsection __rseq_failure, \"ax\"\n\t" \ ".long " __rseq_str(RSEQ_SIG) "\n\t" \ __rseq_str(label) ":\n\t" \ "b %l[" __rseq_str(abort_label) "]\n\t" \ ".popsection\n\t" /* * RSEQ_ASM_OPs: asm operations for rseq * RSEQ_ASM_OP_R_*: has hard-code registers in it * RSEQ_ASM_OP_* (else): doesn't have hard-code registers(unless cr7) */ #define RSEQ_ASM_OP_CMPEQ(var, expect, label) \ LOAD_WORD "%%r17, %[" __rseq_str(var) "]\n\t" \ CMP_WORD "cr7, %%r17, %[" __rseq_str(expect) "]\n\t" \ "bne- cr7, " __rseq_str(label) "\n\t" #define RSEQ_ASM_OP_CMPNE(var, expectnot, label) \ LOAD_WORD "%%r17, %[" __rseq_str(var) "]\n\t" \ CMP_WORD "cr7, %%r17, %[" __rseq_str(expectnot) "]\n\t" \ "beq- cr7, " __rseq_str(label) "\n\t" #define RSEQ_ASM_OP_STORE(value, var) \ STORE_WORD "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t" /* Load @var to r17 */ #define RSEQ_ASM_OP_R_LOAD(var) \ LOAD_WORD "%%r17, %[" __rseq_str(var) "]\n\t" /* Store r17 to @var */ #define RSEQ_ASM_OP_R_STORE(var) \ STORE_WORD "%%r17, %[" __rseq_str(var) "]\n\t" /* Add @count to r17 */ #define RSEQ_ASM_OP_R_ADD(count) \ "add %%r17, %[" __rseq_str(count) "], %%r17\n\t" /* Load (r17 + voffp) to r17 */ #define RSEQ_ASM_OP_R_LOADX(voffp) \ LOADX_WORD "%%r17, %[" __rseq_str(voffp) "], %%r17\n\t" /* TODO: implement a faster memcpy. */ #define RSEQ_ASM_OP_R_MEMCPY() \ "cmpdi %%r19, 0\n\t" \ "beq 333f\n\t" \ "addi %%r20, %%r20, -1\n\t" \ "addi %%r21, %%r21, -1\n\t" \ "222:\n\t" \ "lbzu %%r18, 1(%%r20)\n\t" \ "stbu %%r18, 1(%%r21)\n\t" \ "addi %%r19, %%r19, -1\n\t" \ "cmpdi %%r19, 0\n\t" \ "bne 222b\n\t" \ "333:\n\t" \ #define RSEQ_ASM_OP_R_FINAL_STORE(var, post_commit_label) \ STORE_WORD "%%r17, %[" __rseq_str(var) "]\n\t" \ __rseq_str(post_commit_label) ":\n\t" #define RSEQ_ASM_OP_FINAL_STORE(value, var, post_commit_label) \ STORE_WORD "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t" \ __rseq_str(post_commit_label) ":\n\t" static inline __attribute__((always_inline)) int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) #endif /* final store */ RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) RSEQ_INJECT_ASM(5) RSEQ_ASM_DEFINE_ABORT(4, abort) : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (__rseq_abi.cpu_id), [rseq_cs] "m" (__rseq_abi.rseq_cs), [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv) RSEQ_INJECT_INPUT : "memory", "cc", "r17" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); return 0; abort: RSEQ_INJECT_FAILED return -1; cmpfail: return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_bug("cpu_id comparison failed"); error2: rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot, off_t voffp, intptr_t *load, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) /* cmp @v not equal to @expectnot */ RSEQ_ASM_OP_CMPNE(v, expectnot, %l[cmpfail]) RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) /* cmp @v not equal to @expectnot */ RSEQ_ASM_OP_CMPNE(v, expectnot, %l[error2]) #endif /* load the value of @v */ RSEQ_ASM_OP_R_LOAD(v) /* store it in @load */ RSEQ_ASM_OP_R_STORE(load) /* dereference voffp(v) */ RSEQ_ASM_OP_R_LOADX(voffp) /* final store the value at voffp(v) */ RSEQ_ASM_OP_R_FINAL_STORE(v, 2) RSEQ_INJECT_ASM(5) RSEQ_ASM_DEFINE_ABORT(4, abort) : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (__rseq_abi.cpu_id), [rseq_cs] "m" (__rseq_abi.rseq_cs), /* final store input */ [v] "m" (*v), [expectnot] "r" (expectnot), [voffp] "b" (voffp), [load] "m" (*load) RSEQ_INJECT_INPUT : "memory", "cc", "r17" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); return 0; abort: RSEQ_INJECT_FAILED return -1; cmpfail: return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_bug("cpu_id comparison failed"); error2: rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_addv(intptr_t *v, intptr_t count, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) #ifdef RSEQ_COMPARE_TWICE /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) #endif /* load the value of @v */ RSEQ_ASM_OP_R_LOAD(v) /* add @count to it */ RSEQ_ASM_OP_R_ADD(count) /* final store */ RSEQ_ASM_OP_R_FINAL_STORE(v, 2) RSEQ_INJECT_ASM(4) RSEQ_ASM_DEFINE_ABORT(4, abort) : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (__rseq_abi.cpu_id), [rseq_cs] "m" (__rseq_abi.rseq_cs), /* final store input */ [v] "m" (*v), [count] "r" (count) RSEQ_INJECT_INPUT : "memory", "cc", "r17" RSEQ_INJECT_CLOBBER : abort #ifdef RSEQ_COMPARE_TWICE , error1 #endif ); return 0; abort: RSEQ_INJECT_FAILED return -1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_bug("cpu_id comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect, intptr_t *v2, intptr_t newv2, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) #endif /* try store */ RSEQ_ASM_OP_STORE(newv2, v2) RSEQ_INJECT_ASM(5) /* final store */ RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) RSEQ_INJECT_ASM(6) RSEQ_ASM_DEFINE_ABORT(4, abort) : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (__rseq_abi.cpu_id), [rseq_cs] "m" (__rseq_abi.rseq_cs), /* try store input */ [v2] "m" (*v2), [newv2] "r" (newv2), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv) RSEQ_INJECT_INPUT : "memory", "cc", "r17" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); return 0; abort: RSEQ_INJECT_FAILED return -1; cmpfail: return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_bug("cpu_id comparison failed"); error2: rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect, intptr_t *v2, intptr_t newv2, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) #endif /* try store */ RSEQ_ASM_OP_STORE(newv2, v2) RSEQ_INJECT_ASM(5) /* for 'release' */ "lwsync\n\t" /* final store */ RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) RSEQ_INJECT_ASM(6) RSEQ_ASM_DEFINE_ABORT(4, abort) : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (__rseq_abi.cpu_id), [rseq_cs] "m" (__rseq_abi.rseq_cs), /* try store input */ [v2] "m" (*v2), [newv2] "r" (newv2), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv) RSEQ_INJECT_INPUT : "memory", "cc", "r17" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); return 0; abort: RSEQ_INJECT_FAILED return -1; cmpfail: return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_bug("cpu_id comparison failed"); error2: rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t *v2, intptr_t expect2, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error3]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) RSEQ_INJECT_ASM(4) /* cmp @v2 equal to @expct2 */ RSEQ_ASM_OP_CMPEQ(v2, expect2, %l[cmpfail]) RSEQ_INJECT_ASM(5) #ifdef RSEQ_COMPARE_TWICE /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) /* cmp @v2 equal to @expct2 */ RSEQ_ASM_OP_CMPEQ(v2, expect2, %l[error3]) #endif /* final store */ RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) RSEQ_INJECT_ASM(6) RSEQ_ASM_DEFINE_ABORT(4, abort) : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (__rseq_abi.cpu_id), [rseq_cs] "m" (__rseq_abi.rseq_cs), /* cmp2 input */ [v2] "m" (*v2), [expect2] "r" (expect2), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv) RSEQ_INJECT_INPUT : "memory", "cc", "r17" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2, error3 #endif ); return 0; abort: RSEQ_INJECT_FAILED return -1; cmpfail: return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_bug("cpu_id comparison failed"); error2: rseq_bug("1st expected value comparison failed"); error3: rseq_bug("2nd expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect, void *dst, void *src, size_t len, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* setup for mempcy */ "mr %%r19, %[len]\n\t" "mr %%r20, %[src]\n\t" "mr %%r21, %[dst]\n\t" /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) #endif /* try memcpy */ RSEQ_ASM_OP_R_MEMCPY() RSEQ_INJECT_ASM(5) /* final store */ RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) RSEQ_INJECT_ASM(6) /* teardown */ RSEQ_ASM_DEFINE_ABORT(4, abort) : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (__rseq_abi.cpu_id), [rseq_cs] "m" (__rseq_abi.rseq_cs), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv), /* try memcpy input */ [dst] "r" (dst), [src] "r" (src), [len] "r" (len) RSEQ_INJECT_INPUT : "memory", "cc", "r17", "r18", "r19", "r20", "r21" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); return 0; abort: RSEQ_INJECT_FAILED return -1; cmpfail: return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_bug("cpu_id comparison failed"); error2: rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect, void *dst, void *src, size_t len, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* setup for mempcy */ "mr %%r19, %[len]\n\t" "mr %%r20, %[src]\n\t" "mr %%r21, %[dst]\n\t" /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs) /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail]) RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE /* cmp cpuid */ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) /* cmp @v equal to @expect */ RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2]) #endif /* try memcpy */ RSEQ_ASM_OP_R_MEMCPY() RSEQ_INJECT_ASM(5) /* for 'release' */ "lwsync\n\t" /* final store */ RSEQ_ASM_OP_FINAL_STORE(newv, v, 2) RSEQ_INJECT_ASM(6) /* teardown */ RSEQ_ASM_DEFINE_ABORT(4, abort) : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (__rseq_abi.cpu_id), [rseq_cs] "m" (__rseq_abi.rseq_cs), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv), /* try memcpy input */ [dst] "r" (dst), [src] "r" (src), [len] "r" (len) RSEQ_INJECT_INPUT : "memory", "cc", "r17", "r18", "r19", "r20", "r21" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); return 0; abort: RSEQ_INJECT_FAILED return -1; cmpfail: return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_bug("cpu_id comparison failed"); error2: rseq_bug("expected value comparison failed"); #endif } #undef STORE_WORD #undef LOAD_WORD #undef LOADX_WORD #undef CMP_WORD #endif /* !RSEQ_SKIP_FASTPATH */