| /* SPDX-License-Identifier: LGPL-2.1 OR MIT */ |
| /* |
| * rseq-ppc.h |
| * |
| * (C) Copyright 2016-2022 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| * (C) Copyright 2016-2018 - Boqun Feng <boqun.feng@gmail.com> |
| */ |
| |
| /* |
| * RSEQ_SIG is used with the following trap instruction: |
| * |
| * powerpc-be: 0f e5 00 0b twui r5,11 |
| * powerpc64-le: 0b 00 e5 0f twui r5,11 |
| * powerpc64-be: 0f e5 00 0b twui r5,11 |
| */ |
| |
| #define RSEQ_SIG 0x0fe5000b |
| |
| #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) |
| |
| /* |
| * 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 RSEQ_STORE_LONG(arg) "std%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* To memory ("m" constraint) */ |
| #define RSEQ_STORE_INT(arg) "stw%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* To memory ("m" constraint) */ |
| #define RSEQ_LOAD_LONG(arg) "ld%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* From memory ("m" constraint) */ |
| #define RSEQ_LOAD_INT(arg) "lwz%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* From memory ("m" constraint) */ |
| #define RSEQ_LOADX_LONG "ldx " /* From base register ("b" constraint) */ |
| #define RSEQ_CMP_LONG "cmpd " |
| #define RSEQ_CMP_LONG_INT "cmpdi " |
| |
| #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 RSEQ_STORE_LONG(arg) "stw%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* To memory ("m" constraint) */ |
| #define RSEQ_STORE_INT(arg) RSEQ_STORE_LONG(arg) /* To memory ("m" constraint) */ |
| #define RSEQ_LOAD_LONG(arg) "lwz%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* From memory ("m" constraint) */ |
| #define RSEQ_LOAD_INT(arg) RSEQ_LOAD_LONG(arg) /* From memory ("m" constraint) */ |
| #define RSEQ_LOADX_LONG "lwzx " /* From base register ("b" constraint) */ |
| #define RSEQ_CMP_LONG "cmpw " |
| #define RSEQ_CMP_LONG_INT "cmpwi " |
| |
| #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" \ |
| RSEQ_STORE_INT(rseq_cs) "%%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) \ |
| RSEQ_LOAD_INT(current_cpu_id) "%%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) \ |
| RSEQ_LOAD_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" \ |
| RSEQ_CMP_LONG "cr7, %%r17, %[" __rseq_str(expect) "]\n\t" \ |
| "bne- cr7, " __rseq_str(label) "\n\t" |
| |
| #define RSEQ_ASM_OP_CMPNE(var, expectnot, label) \ |
| RSEQ_LOAD_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" \ |
| RSEQ_CMP_LONG "cr7, %%r17, %[" __rseq_str(expectnot) "]\n\t" \ |
| "beq- cr7, " __rseq_str(label) "\n\t" |
| |
| #define RSEQ_ASM_OP_STORE(value, var) \ |
| RSEQ_STORE_LONG(var) "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t" |
| |
| /* Load @var to r17 */ |
| #define RSEQ_ASM_OP_R_LOAD(var) \ |
| RSEQ_LOAD_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" |
| |
| /* Store r17 to @var */ |
| #define RSEQ_ASM_OP_R_STORE(var) \ |
| RSEQ_STORE_LONG(var) "%%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) \ |
| RSEQ_LOADX_LONG "%%r17, %[" __rseq_str(voffp) "], %%r17\n\t" |
| |
| /* TODO: implement a faster memcpy. */ |
| #define RSEQ_ASM_OP_R_MEMCPY() \ |
| RSEQ_CMP_LONG_INT "%%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" \ |
| RSEQ_CMP_LONG_INT "%%r19, 0\n\t" \ |
| "bne 222b\n\t" \ |
| "333:\n\t" \ |
| |
| #define RSEQ_ASM_OP_R_FINAL_STORE(var, post_commit_label) \ |
| RSEQ_STORE_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" \ |
| __rseq_str(post_commit_label) ":\n\t" |
| |
| #define RSEQ_ASM_OP_FINAL_STORE(value, var, post_commit_label) \ |
| RSEQ_STORE_LONG(var) "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t" \ |
| __rseq_str(post_commit_label) ":\n\t" |
| |
| /* Per-cpu-id indexing. */ |
| |
| #define RSEQ_TEMPLATE_CPU_ID |
| #define RSEQ_TEMPLATE_MO_RELAXED |
| #include "rseq-ppc-bits.h" |
| #undef RSEQ_TEMPLATE_MO_RELAXED |
| |
| #define RSEQ_TEMPLATE_MO_RELEASE |
| #include "rseq-ppc-bits.h" |
| #undef RSEQ_TEMPLATE_MO_RELEASE |
| #undef RSEQ_TEMPLATE_CPU_ID |
| |
| /* Per-mm-cid indexing. */ |
| |
| #define RSEQ_TEMPLATE_MM_CID |
| #define RSEQ_TEMPLATE_MO_RELAXED |
| #include "rseq-ppc-bits.h" |
| #undef RSEQ_TEMPLATE_MO_RELAXED |
| |
| #define RSEQ_TEMPLATE_MO_RELEASE |
| #include "rseq-ppc-bits.h" |
| #undef RSEQ_TEMPLATE_MO_RELEASE |
| #undef RSEQ_TEMPLATE_MM_CID |
| |
| /* APIs which are not based on cpu ids. */ |
| |
| #define RSEQ_TEMPLATE_CPU_ID_NONE |
| #define RSEQ_TEMPLATE_MO_RELAXED |
| #include "rseq-ppc-bits.h" |
| #undef RSEQ_TEMPLATE_MO_RELAXED |
| #undef RSEQ_TEMPLATE_CPU_ID_NONE |
