595 lines
16 KiB
C
595 lines
16 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* rseq-arm64.h
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*
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* (C) Copyright 2016-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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* (C) Copyright 2018 - Will Deacon <will.deacon@arm.com>
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*/
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#define RSEQ_SIG 0xd428bc00 /* BRK #0x45E0 */
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#define rseq_smp_mb() __asm__ __volatile__ ("dmb ish" ::: "memory")
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#define rseq_smp_rmb() __asm__ __volatile__ ("dmb ishld" ::: "memory")
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#define rseq_smp_wmb() __asm__ __volatile__ ("dmb ishst" ::: "memory")
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#define rseq_smp_load_acquire(p) \
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__extension__ ({ \
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__typeof(*p) ____p1; \
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switch (sizeof(*p)) { \
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case 1: \
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asm volatile ("ldarb %w0, %1" \
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: "=r" (*(__u8 *)p) \
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: "Q" (*p) : "memory"); \
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break; \
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case 2: \
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asm volatile ("ldarh %w0, %1" \
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: "=r" (*(__u16 *)p) \
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: "Q" (*p) : "memory"); \
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break; \
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case 4: \
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asm volatile ("ldar %w0, %1" \
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: "=r" (*(__u32 *)p) \
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: "Q" (*p) : "memory"); \
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break; \
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case 8: \
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asm volatile ("ldar %0, %1" \
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: "=r" (*(__u64 *)p) \
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: "Q" (*p) : "memory"); \
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break; \
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} \
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____p1; \
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})
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#define rseq_smp_acquire__after_ctrl_dep() rseq_smp_rmb()
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#define rseq_smp_store_release(p, v) \
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do { \
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switch (sizeof(*p)) { \
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case 1: \
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asm volatile ("stlrb %w1, %0" \
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: "=Q" (*p) \
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: "r" ((__u8)v) \
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: "memory"); \
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break; \
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case 2: \
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asm volatile ("stlrh %w1, %0" \
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: "=Q" (*p) \
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: "r" ((__u16)v) \
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: "memory"); \
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break; \
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case 4: \
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asm volatile ("stlr %w1, %0" \
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: "=Q" (*p) \
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: "r" ((__u32)v) \
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: "memory"); \
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break; \
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case 8: \
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asm volatile ("stlr %1, %0" \
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: "=Q" (*p) \
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: "r" ((__u64)v) \
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: "memory"); \
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break; \
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} \
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} while (0)
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#ifdef RSEQ_SKIP_FASTPATH
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#include "rseq-skip.h"
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#else /* !RSEQ_SKIP_FASTPATH */
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#define RSEQ_ASM_TMP_REG32 "w15"
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#define RSEQ_ASM_TMP_REG "x15"
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#define RSEQ_ASM_TMP_REG_2 "x14"
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#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
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post_commit_offset, abort_ip) \
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" .pushsection __rseq_table, \"aw\"\n" \
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" .balign 32\n" \
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__rseq_str(label) ":\n" \
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" .long " __rseq_str(version) ", " __rseq_str(flags) "\n" \
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" .quad " __rseq_str(start_ip) ", " \
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__rseq_str(post_commit_offset) ", " \
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__rseq_str(abort_ip) "\n" \
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" .popsection\n"
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#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
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__RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \
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(post_commit_ip - start_ip), abort_ip)
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#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
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RSEQ_INJECT_ASM(1) \
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" adrp " RSEQ_ASM_TMP_REG ", " __rseq_str(cs_label) "\n" \
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" add " RSEQ_ASM_TMP_REG ", " RSEQ_ASM_TMP_REG \
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", :lo12:" __rseq_str(cs_label) "\n" \
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" str " RSEQ_ASM_TMP_REG ", %[" __rseq_str(rseq_cs) "]\n" \
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__rseq_str(label) ":\n"
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#define RSEQ_ASM_DEFINE_ABORT(label, abort_label) \
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" b 222f\n" \
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" .inst " __rseq_str(RSEQ_SIG) "\n" \
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__rseq_str(label) ":\n" \
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" b %l[" __rseq_str(abort_label) "]\n" \
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"222:\n"
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#define RSEQ_ASM_OP_STORE(value, var) \
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" str %[" __rseq_str(value) "], %[" __rseq_str(var) "]\n"
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#define RSEQ_ASM_OP_STORE_RELEASE(value, var) \
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" stlr %[" __rseq_str(value) "], %[" __rseq_str(var) "]\n"
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#define RSEQ_ASM_OP_FINAL_STORE(value, var, post_commit_label) \
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RSEQ_ASM_OP_STORE(value, var) \
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__rseq_str(post_commit_label) ":\n"
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#define RSEQ_ASM_OP_FINAL_STORE_RELEASE(value, var, post_commit_label) \
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RSEQ_ASM_OP_STORE_RELEASE(value, var) \
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__rseq_str(post_commit_label) ":\n"
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#define RSEQ_ASM_OP_CMPEQ(var, expect, label) \
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" ldr " RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n" \
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" sub " RSEQ_ASM_TMP_REG ", " RSEQ_ASM_TMP_REG \
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", %[" __rseq_str(expect) "]\n" \
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" cbnz " RSEQ_ASM_TMP_REG ", " __rseq_str(label) "\n"
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#define RSEQ_ASM_OP_CMPEQ32(var, expect, label) \
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" ldr " RSEQ_ASM_TMP_REG32 ", %[" __rseq_str(var) "]\n" \
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" sub " RSEQ_ASM_TMP_REG32 ", " RSEQ_ASM_TMP_REG32 \
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", %w[" __rseq_str(expect) "]\n" \
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" cbnz " RSEQ_ASM_TMP_REG32 ", " __rseq_str(label) "\n"
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#define RSEQ_ASM_OP_CMPNE(var, expect, label) \
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" ldr " RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n" \
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" sub " RSEQ_ASM_TMP_REG ", " RSEQ_ASM_TMP_REG \
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", %[" __rseq_str(expect) "]\n" \
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" cbz " RSEQ_ASM_TMP_REG ", " __rseq_str(label) "\n"
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#define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \
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RSEQ_INJECT_ASM(2) \
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RSEQ_ASM_OP_CMPEQ32(current_cpu_id, cpu_id, label)
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#define RSEQ_ASM_OP_R_LOAD(var) \
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" ldr " RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n"
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#define RSEQ_ASM_OP_R_STORE(var) \
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" str " RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n"
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#define RSEQ_ASM_OP_R_LOAD_OFF(offset) \
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" ldr " RSEQ_ASM_TMP_REG ", [" RSEQ_ASM_TMP_REG \
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", %[" __rseq_str(offset) "]]\n"
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#define RSEQ_ASM_OP_R_ADD(count) \
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" add " RSEQ_ASM_TMP_REG ", " RSEQ_ASM_TMP_REG \
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", %[" __rseq_str(count) "]\n"
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#define RSEQ_ASM_OP_R_FINAL_STORE(var, post_commit_label) \
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" str " RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n" \
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__rseq_str(post_commit_label) ":\n"
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#define RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len) \
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" cbz %[" __rseq_str(len) "], 333f\n" \
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" mov " RSEQ_ASM_TMP_REG_2 ", %[" __rseq_str(len) "]\n" \
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"222: sub " RSEQ_ASM_TMP_REG_2 ", " RSEQ_ASM_TMP_REG_2 ", #1\n" \
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" ldrb " RSEQ_ASM_TMP_REG32 ", [%[" __rseq_str(src) "]" \
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", " RSEQ_ASM_TMP_REG_2 "]\n" \
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" strb " RSEQ_ASM_TMP_REG32 ", [%[" __rseq_str(dst) "]" \
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", " RSEQ_ASM_TMP_REG_2 "]\n" \
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" cbnz " RSEQ_ASM_TMP_REG_2 ", 222b\n" \
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"333:\n"
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static inline __attribute__((always_inline))
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int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
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{
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RSEQ_INJECT_C(9)
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
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RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
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RSEQ_INJECT_ASM(3)
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RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
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RSEQ_INJECT_ASM(4)
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
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#endif
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RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
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RSEQ_INJECT_ASM(5)
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RSEQ_ASM_DEFINE_ABORT(4, abort)
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: /* gcc asm goto does not allow outputs */
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: [cpu_id] "r" (cpu),
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[current_cpu_id] "Qo" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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[v] "Qo" (*v),
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[expect] "r" (expect),
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[newv] "r" (newv)
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RSEQ_INJECT_INPUT
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: "memory", RSEQ_ASM_TMP_REG
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: abort, cmpfail
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#ifdef RSEQ_COMPARE_TWICE
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, error1, error2
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#endif
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);
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return 0;
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abort:
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RSEQ_INJECT_FAILED
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return -1;
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cmpfail:
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return 1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_bug("cpu_id comparison failed");
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error2:
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rseq_bug("expected value comparison failed");
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#endif
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}
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static inline __attribute__((always_inline))
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int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
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off_t voffp, intptr_t *load, int cpu)
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{
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RSEQ_INJECT_C(9)
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
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RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
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RSEQ_INJECT_ASM(3)
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RSEQ_ASM_OP_CMPNE(v, expectnot, %l[cmpfail])
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RSEQ_INJECT_ASM(4)
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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RSEQ_ASM_OP_CMPNE(v, expectnot, %l[error2])
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#endif
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RSEQ_ASM_OP_R_LOAD(v)
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RSEQ_ASM_OP_R_STORE(load)
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RSEQ_ASM_OP_R_LOAD_OFF(voffp)
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RSEQ_ASM_OP_R_FINAL_STORE(v, 3)
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RSEQ_INJECT_ASM(5)
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RSEQ_ASM_DEFINE_ABORT(4, abort)
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: /* gcc asm goto does not allow outputs */
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: [cpu_id] "r" (cpu),
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[current_cpu_id] "Qo" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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[v] "Qo" (*v),
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[expectnot] "r" (expectnot),
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[load] "Qo" (*load),
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[voffp] "r" (voffp)
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RSEQ_INJECT_INPUT
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: "memory", RSEQ_ASM_TMP_REG
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: abort, cmpfail
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#ifdef RSEQ_COMPARE_TWICE
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, error1, error2
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#endif
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);
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return 0;
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abort:
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RSEQ_INJECT_FAILED
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return -1;
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cmpfail:
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return 1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_bug("cpu_id comparison failed");
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error2:
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rseq_bug("expected value comparison failed");
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#endif
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}
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static inline __attribute__((always_inline))
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int rseq_addv(intptr_t *v, intptr_t count, int cpu)
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{
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RSEQ_INJECT_C(9)
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
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RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
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RSEQ_INJECT_ASM(3)
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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#endif
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RSEQ_ASM_OP_R_LOAD(v)
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RSEQ_ASM_OP_R_ADD(count)
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RSEQ_ASM_OP_R_FINAL_STORE(v, 3)
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RSEQ_INJECT_ASM(4)
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RSEQ_ASM_DEFINE_ABORT(4, abort)
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: /* gcc asm goto does not allow outputs */
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: [cpu_id] "r" (cpu),
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[current_cpu_id] "Qo" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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[v] "Qo" (*v),
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[count] "r" (count)
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RSEQ_INJECT_INPUT
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: "memory", RSEQ_ASM_TMP_REG
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: abort
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#ifdef RSEQ_COMPARE_TWICE
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, error1
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#endif
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);
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return 0;
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abort:
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RSEQ_INJECT_FAILED
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return -1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_bug("cpu_id comparison failed");
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#endif
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}
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static inline __attribute__((always_inline))
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int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
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intptr_t *v2, intptr_t newv2,
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intptr_t newv, int cpu)
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{
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RSEQ_INJECT_C(9)
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
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RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
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RSEQ_INJECT_ASM(3)
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RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
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RSEQ_INJECT_ASM(4)
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
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#endif
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RSEQ_ASM_OP_STORE(newv2, v2)
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RSEQ_INJECT_ASM(5)
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RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
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RSEQ_INJECT_ASM(6)
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RSEQ_ASM_DEFINE_ABORT(4, abort)
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: /* gcc asm goto does not allow outputs */
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: [cpu_id] "r" (cpu),
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[current_cpu_id] "Qo" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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[expect] "r" (expect),
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[v] "Qo" (*v),
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[newv] "r" (newv),
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[v2] "Qo" (*v2),
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[newv2] "r" (newv2)
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RSEQ_INJECT_INPUT
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: "memory", RSEQ_ASM_TMP_REG
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: abort, cmpfail
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#ifdef RSEQ_COMPARE_TWICE
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, error1, error2
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#endif
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);
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return 0;
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abort:
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RSEQ_INJECT_FAILED
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return -1;
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cmpfail:
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return 1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_bug("cpu_id comparison failed");
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error2:
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rseq_bug("expected value comparison failed");
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#endif
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}
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static inline __attribute__((always_inline))
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int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
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intptr_t *v2, intptr_t newv2,
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intptr_t newv, int cpu)
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{
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RSEQ_INJECT_C(9)
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
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RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
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RSEQ_INJECT_ASM(3)
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RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
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RSEQ_INJECT_ASM(4)
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
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#endif
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RSEQ_ASM_OP_STORE(newv2, v2)
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RSEQ_INJECT_ASM(5)
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RSEQ_ASM_OP_FINAL_STORE_RELEASE(newv, v, 3)
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RSEQ_INJECT_ASM(6)
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RSEQ_ASM_DEFINE_ABORT(4, abort)
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: /* gcc asm goto does not allow outputs */
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: [cpu_id] "r" (cpu),
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[current_cpu_id] "Qo" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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[expect] "r" (expect),
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[v] "Qo" (*v),
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[newv] "r" (newv),
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[v2] "Qo" (*v2),
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[newv2] "r" (newv2)
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RSEQ_INJECT_INPUT
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: "memory", RSEQ_ASM_TMP_REG
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: abort, cmpfail
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#ifdef RSEQ_COMPARE_TWICE
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, error1, error2
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#endif
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);
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return 0;
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abort:
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RSEQ_INJECT_FAILED
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return -1;
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cmpfail:
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return 1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_bug("cpu_id comparison failed");
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error2:
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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(1, 2f, 3f, 4f)
|
|
RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
|
RSEQ_INJECT_ASM(3)
|
|
RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
|
|
RSEQ_INJECT_ASM(4)
|
|
RSEQ_ASM_OP_CMPEQ(v2, expect2, %l[cmpfail])
|
|
RSEQ_INJECT_ASM(5)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
|
RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
|
|
RSEQ_ASM_OP_CMPEQ(v2, expect2, %l[error3])
|
|
#endif
|
|
RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
|
|
RSEQ_INJECT_ASM(6)
|
|
RSEQ_ASM_DEFINE_ABORT(4, abort)
|
|
: /* gcc asm goto does not allow outputs */
|
|
: [cpu_id] "r" (cpu),
|
|
[current_cpu_id] "Qo" (__rseq_abi.cpu_id),
|
|
[rseq_cs] "m" (__rseq_abi.rseq_cs),
|
|
[v] "Qo" (*v),
|
|
[expect] "r" (expect),
|
|
[v2] "Qo" (*v2),
|
|
[expect2] "r" (expect2),
|
|
[newv] "r" (newv)
|
|
RSEQ_INJECT_INPUT
|
|
: "memory", RSEQ_ASM_TMP_REG
|
|
: 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("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(1, 2f, 3f, 4f)
|
|
RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
|
RSEQ_INJECT_ASM(3)
|
|
RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
|
|
RSEQ_INJECT_ASM(4)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
|
RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
|
|
#endif
|
|
RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len)
|
|
RSEQ_INJECT_ASM(5)
|
|
RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
|
|
RSEQ_INJECT_ASM(6)
|
|
RSEQ_ASM_DEFINE_ABORT(4, abort)
|
|
: /* gcc asm goto does not allow outputs */
|
|
: [cpu_id] "r" (cpu),
|
|
[current_cpu_id] "Qo" (__rseq_abi.cpu_id),
|
|
[rseq_cs] "m" (__rseq_abi.rseq_cs),
|
|
[expect] "r" (expect),
|
|
[v] "Qo" (*v),
|
|
[newv] "r" (newv),
|
|
[dst] "r" (dst),
|
|
[src] "r" (src),
|
|
[len] "r" (len)
|
|
RSEQ_INJECT_INPUT
|
|
: "memory", RSEQ_ASM_TMP_REG, RSEQ_ASM_TMP_REG_2
|
|
: 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(1, 2f, 3f, 4f)
|
|
RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
|
RSEQ_INJECT_ASM(3)
|
|
RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
|
|
RSEQ_INJECT_ASM(4)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
|
RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
|
|
#endif
|
|
RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len)
|
|
RSEQ_INJECT_ASM(5)
|
|
RSEQ_ASM_OP_FINAL_STORE_RELEASE(newv, v, 3)
|
|
RSEQ_INJECT_ASM(6)
|
|
RSEQ_ASM_DEFINE_ABORT(4, abort)
|
|
: /* gcc asm goto does not allow outputs */
|
|
: [cpu_id] "r" (cpu),
|
|
[current_cpu_id] "Qo" (__rseq_abi.cpu_id),
|
|
[rseq_cs] "m" (__rseq_abi.rseq_cs),
|
|
[expect] "r" (expect),
|
|
[v] "Qo" (*v),
|
|
[newv] "r" (newv),
|
|
[dst] "r" (dst),
|
|
[src] "r" (src),
|
|
[len] "r" (len)
|
|
RSEQ_INJECT_INPUT
|
|
: "memory", RSEQ_ASM_TMP_REG, RSEQ_ASM_TMP_REG_2
|
|
: 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
|
|
}
|
|
|
|
#endif /* !RSEQ_SKIP_FASTPATH */
|