611 lines
17 KiB
C
611 lines
17 KiB
C
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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* RSEQ_SIG uses the trap4 instruction. As Linux does not make use of the
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* access-register mode nor the linkage stack this instruction will always
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* cause a special-operation exception (the trap-enabled bit in the DUCT
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* is and will stay 0). The instruction pattern is
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* b2 ff 0f ff trap4 4095(%r0)
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*/
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#define RSEQ_SIG 0xB2FF0FFF
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#define rseq_smp_mb() __asm__ __volatile__ ("bcr 15,0" ::: "memory")
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#define rseq_smp_rmb() rseq_smp_mb()
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#define rseq_smp_wmb() rseq_smp_mb()
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#define rseq_smp_load_acquire(p) \
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__extension__ ({ \
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__typeof(*p) ____p1 = RSEQ_READ_ONCE(*p); \
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rseq_barrier(); \
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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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rseq_barrier(); \
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RSEQ_WRITE_ONCE(*p, v); \
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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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#ifdef __s390x__
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#define LONG_L "lg"
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#define LONG_S "stg"
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#define LONG_LT_R "ltgr"
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#define LONG_CMP "cg"
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#define LONG_CMP_R "cgr"
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#define LONG_ADDI "aghi"
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#define LONG_ADD_R "agr"
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#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \
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start_ip, post_commit_offset, abort_ip) \
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".pushsection __rseq_cs, \"aw\"\n\t" \
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".balign 32\n\t" \
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__rseq_str(label) ":\n\t" \
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".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
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".quad " __rseq_str(start_ip) ", " __rseq_str(post_commit_offset) ", " __rseq_str(abort_ip) "\n\t" \
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".popsection\n\t" \
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".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
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".quad " __rseq_str(label) "b\n\t" \
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".popsection\n\t"
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/*
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* Exit points of a rseq critical section consist of all instructions outside
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* of the critical section where a critical section can either branch to or
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* reach through the normal course of its execution. The abort IP and the
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* post-commit IP are already part of the __rseq_cs section and should not be
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* explicitly defined as additional exit points. Knowing all exit points is
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* useful to assist debuggers stepping over the critical section.
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*/
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#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
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".pushsection __rseq_exit_point_array, \"aw\"\n\t" \
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".quad " __rseq_str(start_ip) ", " __rseq_str(exit_ip) "\n\t" \
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".popsection\n\t"
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#elif __s390__
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#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \
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start_ip, post_commit_offset, abort_ip) \
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".pushsection __rseq_cs, \"aw\"\n\t" \
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".balign 32\n\t" \
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__rseq_str(label) ":\n\t" \
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".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
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".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) "\n\t" \
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".popsection\n\t" \
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".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
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".long 0x0, " __rseq_str(label) "b\n\t" \
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".popsection\n\t"
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/*
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* Exit points of a rseq critical section consist of all instructions outside
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* of the critical section where a critical section can either branch to or
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* reach through the normal course of its execution. The abort IP and the
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* post-commit IP are already part of the __rseq_cs section and should not be
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* explicitly defined as additional exit points. Knowing all exit points is
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* useful to assist debuggers stepping over the critical section.
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*/
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#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
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".pushsection __rseq_exit_point_array, \"aw\"\n\t" \
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".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(exit_ip) "\n\t" \
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".popsection\n\t"
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#define LONG_L "l"
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#define LONG_S "st"
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#define LONG_LT_R "ltr"
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#define LONG_CMP "c"
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#define LONG_CMP_R "cr"
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#define LONG_ADDI "ahi"
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#define LONG_ADD_R "ar"
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#endif
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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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"larl %%r0, " __rseq_str(cs_label) "\n\t" \
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LONG_S " %%r0, %[" __rseq_str(rseq_cs) "]\n\t" \
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__rseq_str(label) ":\n\t"
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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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"c %[" __rseq_str(cpu_id) "], %[" __rseq_str(current_cpu_id) "]\n\t" \
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"jnz " __rseq_str(label) "\n\t"
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#define RSEQ_ASM_DEFINE_ABORT(label, teardown, abort_label) \
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".pushsection __rseq_failure, \"ax\"\n\t" \
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".long " __rseq_str(RSEQ_SIG) "\n\t" \
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__rseq_str(label) ":\n\t" \
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teardown \
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"jg %l[" __rseq_str(abort_label) "]\n\t" \
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".popsection\n\t"
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#define RSEQ_ASM_DEFINE_CMPFAIL(label, teardown, cmpfail_label) \
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".pushsection __rseq_failure, \"ax\"\n\t" \
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__rseq_str(label) ":\n\t" \
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teardown \
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"jg %l[" __rseq_str(cmpfail_label) "]\n\t" \
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".popsection\n\t"
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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(3, 1f, 2f, 4f) /* start, commit, abort */
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
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#endif
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/* Start rseq by storing table entry pointer into rseq_cs. */
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RSEQ_ASM_STORE_RSEQ_CS(1, 3b, 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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LONG_CMP " %[expect], %[v]\n\t"
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"jnz %l[cmpfail]\n\t"
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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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LONG_CMP " %[expect], %[v]\n\t"
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"jnz %l[error2]\n\t"
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#endif
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/* final store */
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LONG_S " %[newv], %[v]\n\t"
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"2:\n\t"
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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] "m" (rseq_get_abi()->cpu_id),
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[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
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[v] "m" (*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", "cc", "r0"
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RSEQ_INJECT_CLOBBER
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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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rseq_after_asm_goto();
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return 0;
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abort:
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rseq_after_asm_goto();
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RSEQ_INJECT_FAILED
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return -1;
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cmpfail:
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rseq_after_asm_goto();
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return 1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_after_asm_goto();
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rseq_bug("cpu_id comparison failed");
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error2:
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rseq_after_asm_goto();
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rseq_bug("expected value comparison failed");
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#endif
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}
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/*
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* Compare @v against @expectnot. When it does _not_ match, load @v
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* into @load, and store the content of *@v + voffp into @v.
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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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long 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(3, 1f, 2f, 4f) /* start, commit, abort */
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
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#endif
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/* Start rseq by storing table entry pointer into rseq_cs. */
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RSEQ_ASM_STORE_RSEQ_CS(1, 3b, 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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LONG_L " %%r1, %[v]\n\t"
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LONG_CMP_R " %%r1, %[expectnot]\n\t"
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"je %l[cmpfail]\n\t"
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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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LONG_L " %%r1, %[v]\n\t"
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LONG_CMP_R " %%r1, %[expectnot]\n\t"
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"je %l[error2]\n\t"
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#endif
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LONG_S " %%r1, %[load]\n\t"
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LONG_ADD_R " %%r1, %[voffp]\n\t"
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LONG_L " %%r1, 0(%%r1)\n\t"
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/* final store */
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LONG_S " %%r1, %[v]\n\t"
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"2:\n\t"
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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] "m" (rseq_get_abi()->cpu_id),
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[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
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/* final store input */
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[v] "m" (*v),
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[expectnot] "r" (expectnot),
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[voffp] "r" (voffp),
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[load] "m" (*load)
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RSEQ_INJECT_INPUT
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: "memory", "cc", "r0", "r1"
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RSEQ_INJECT_CLOBBER
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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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rseq_after_asm_goto();
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return 0;
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abort:
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rseq_after_asm_goto();
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RSEQ_INJECT_FAILED
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return -1;
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cmpfail:
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rseq_after_asm_goto();
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return 1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_after_asm_goto();
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rseq_bug("cpu_id comparison failed");
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error2:
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rseq_after_asm_goto();
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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(3, 1f, 2f, 4f) /* start, commit, abort */
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
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#endif
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/* Start rseq by storing table entry pointer into rseq_cs. */
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RSEQ_ASM_STORE_RSEQ_CS(1, 3b, 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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LONG_L " %%r0, %[v]\n\t"
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LONG_ADD_R " %%r0, %[count]\n\t"
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/* final store */
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LONG_S " %%r0, %[v]\n\t"
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"2:\n\t"
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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] "m" (rseq_get_abi()->cpu_id),
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[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
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/* final store input */
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[v] "m" (*v),
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[count] "r" (count)
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RSEQ_INJECT_INPUT
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: "memory", "cc", "r0"
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RSEQ_INJECT_CLOBBER
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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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rseq_after_asm_goto();
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return 0;
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abort:
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rseq_after_asm_goto();
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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:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
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)
|
||
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||
|
|
RSEQ_INJECT_ASM(3)
|
||
|
|
LONG_CMP " %[expect], %[v]\n\t"
|
||
|
|
"jnz %l[cmpfail]\n\t"
|
||
|
|
RSEQ_INJECT_ASM(4)
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
||
|
|
LONG_CMP " %[expect], %[v]\n\t"
|
||
|
|
"jnz %l[error2]\n\t"
|
||
|
|
#endif
|
||
|
|
/* try store */
|
||
|
|
LONG_S " %[newv2], %[v2]\n\t"
|
||
|
|
RSEQ_INJECT_ASM(5)
|
||
|
|
/* final store */
|
||
|
|
LONG_S " %[newv], %[v]\n\t"
|
||
|
|
"2:\n\t"
|
||
|
|
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_get_abi()->cpu_id),
|
||
|
|
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
|
||
|
|
/* 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", "r0"
|
||
|
|
RSEQ_INJECT_CLOBBER
|
||
|
|
: abort, cmpfail
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
, error1, error2
|
||
|
|
#endif
|
||
|
|
);
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
return 0;
|
||
|
|
abort:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
RSEQ_INJECT_FAILED
|
||
|
|
return -1;
|
||
|
|
cmpfail:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
return 1;
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
error1:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
rseq_bug("cpu_id comparison failed");
|
||
|
|
error2:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
rseq_bug("expected value comparison failed");
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/* s390 is TSO. */
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
return rseq_cmpeqv_trystorev_storev(v, expect, v2, newv2, newv, cpu);
|
||
|
|
}
|
||
|
|
|
||
|
|
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)
|
||
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||
|
|
RSEQ_INJECT_ASM(3)
|
||
|
|
LONG_CMP " %[expect], %[v]\n\t"
|
||
|
|
"jnz %l[cmpfail]\n\t"
|
||
|
|
RSEQ_INJECT_ASM(4)
|
||
|
|
LONG_CMP " %[expect2], %[v2]\n\t"
|
||
|
|
"jnz %l[cmpfail]\n\t"
|
||
|
|
RSEQ_INJECT_ASM(5)
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
||
|
|
LONG_CMP " %[expect], %[v]\n\t"
|
||
|
|
"jnz %l[error2]\n\t"
|
||
|
|
LONG_CMP " %[expect2], %[v2]\n\t"
|
||
|
|
"jnz %l[error3]\n\t"
|
||
|
|
#endif
|
||
|
|
/* final store */
|
||
|
|
LONG_S " %[newv], %[v]\n\t"
|
||
|
|
"2:\n\t"
|
||
|
|
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_get_abi()->cpu_id),
|
||
|
|
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
|
||
|
|
/* 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", "r0"
|
||
|
|
RSEQ_INJECT_CLOBBER
|
||
|
|
: abort, cmpfail
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
, error1, error2, error3
|
||
|
|
#endif
|
||
|
|
);
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
return 0;
|
||
|
|
abort:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
RSEQ_INJECT_FAILED
|
||
|
|
return -1;
|
||
|
|
cmpfail:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
return 1;
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
error1:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
rseq_bug("cpu_id comparison failed");
|
||
|
|
error2:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
rseq_bug("1st expected value comparison failed");
|
||
|
|
error3:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
uint64_t rseq_scratch[3];
|
||
|
|
|
||
|
|
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
|
||
|
|
LONG_S " %[src], %[rseq_scratch0]\n\t"
|
||
|
|
LONG_S " %[dst], %[rseq_scratch1]\n\t"
|
||
|
|
LONG_S " %[len], %[rseq_scratch2]\n\t"
|
||
|
|
/* Start rseq by storing table entry pointer into rseq_cs. */
|
||
|
|
RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs)
|
||
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||
|
|
RSEQ_INJECT_ASM(3)
|
||
|
|
LONG_CMP " %[expect], %[v]\n\t"
|
||
|
|
"jnz 5f\n\t"
|
||
|
|
RSEQ_INJECT_ASM(4)
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
|
||
|
|
LONG_CMP " %[expect], %[v]\n\t"
|
||
|
|
"jnz 7f\n\t"
|
||
|
|
#endif
|
||
|
|
/* try memcpy */
|
||
|
|
LONG_LT_R " %[len], %[len]\n\t"
|
||
|
|
"jz 333f\n\t"
|
||
|
|
"222:\n\t"
|
||
|
|
"ic %%r0,0(%[src])\n\t"
|
||
|
|
"stc %%r0,0(%[dst])\n\t"
|
||
|
|
LONG_ADDI " %[src], 1\n\t"
|
||
|
|
LONG_ADDI " %[dst], 1\n\t"
|
||
|
|
LONG_ADDI " %[len], -1\n\t"
|
||
|
|
"jnz 222b\n\t"
|
||
|
|
"333:\n\t"
|
||
|
|
RSEQ_INJECT_ASM(5)
|
||
|
|
/* final store */
|
||
|
|
LONG_S " %[newv], %[v]\n\t"
|
||
|
|
"2:\n\t"
|
||
|
|
RSEQ_INJECT_ASM(6)
|
||
|
|
/* teardown */
|
||
|
|
LONG_L " %[len], %[rseq_scratch2]\n\t"
|
||
|
|
LONG_L " %[dst], %[rseq_scratch1]\n\t"
|
||
|
|
LONG_L " %[src], %[rseq_scratch0]\n\t"
|
||
|
|
RSEQ_ASM_DEFINE_ABORT(4,
|
||
|
|
LONG_L " %[len], %[rseq_scratch2]\n\t"
|
||
|
|
LONG_L " %[dst], %[rseq_scratch1]\n\t"
|
||
|
|
LONG_L " %[src], %[rseq_scratch0]\n\t",
|
||
|
|
abort)
|
||
|
|
RSEQ_ASM_DEFINE_CMPFAIL(5,
|
||
|
|
LONG_L " %[len], %[rseq_scratch2]\n\t"
|
||
|
|
LONG_L " %[dst], %[rseq_scratch1]\n\t"
|
||
|
|
LONG_L " %[src], %[rseq_scratch0]\n\t",
|
||
|
|
cmpfail)
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
RSEQ_ASM_DEFINE_CMPFAIL(6,
|
||
|
|
LONG_L " %[len], %[rseq_scratch2]\n\t"
|
||
|
|
LONG_L " %[dst], %[rseq_scratch1]\n\t"
|
||
|
|
LONG_L " %[src], %[rseq_scratch0]\n\t",
|
||
|
|
error1)
|
||
|
|
RSEQ_ASM_DEFINE_CMPFAIL(7,
|
||
|
|
LONG_L " %[len], %[rseq_scratch2]\n\t"
|
||
|
|
LONG_L " %[dst], %[rseq_scratch1]\n\t"
|
||
|
|
LONG_L " %[src], %[rseq_scratch0]\n\t",
|
||
|
|
error2)
|
||
|
|
#endif
|
||
|
|
: /* gcc asm goto does not allow outputs */
|
||
|
|
: [cpu_id] "r" (cpu),
|
||
|
|
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
|
||
|
|
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
|
||
|
|
/* 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_scratch0] "m" (rseq_scratch[0]),
|
||
|
|
[rseq_scratch1] "m" (rseq_scratch[1]),
|
||
|
|
[rseq_scratch2] "m" (rseq_scratch[2])
|
||
|
|
RSEQ_INJECT_INPUT
|
||
|
|
: "memory", "cc", "r0"
|
||
|
|
RSEQ_INJECT_CLOBBER
|
||
|
|
: abort, cmpfail
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
, error1, error2
|
||
|
|
#endif
|
||
|
|
);
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
return 0;
|
||
|
|
abort:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
RSEQ_INJECT_FAILED
|
||
|
|
return -1;
|
||
|
|
cmpfail:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
return 1;
|
||
|
|
#ifdef RSEQ_COMPARE_TWICE
|
||
|
|
error1:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
rseq_bug("cpu_id comparison failed");
|
||
|
|
error2:
|
||
|
|
rseq_after_asm_goto();
|
||
|
|
rseq_bug("expected value comparison failed");
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/* s390 is TSO. */
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
return rseq_cmpeqv_trymemcpy_storev(v, expect, dst, src, len,
|
||
|
|
newv, cpu);
|
||
|
|
}
|
||
|
|
#endif /* !RSEQ_SKIP_FASTPATH */
|