672 lines
18 KiB
C
672 lines
18 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* rseq-ppc.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 2016-2018 - Boqun Feng <boqun.feng@gmail.com>
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*/
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#define RSEQ_SIG 0x53053053
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#define rseq_smp_mb() __asm__ __volatile__ ("sync" ::: "memory", "cc")
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#define rseq_smp_lwsync() __asm__ __volatile__ ("lwsync" ::: "memory", "cc")
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#define rseq_smp_rmb() rseq_smp_lwsync()
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#define rseq_smp_wmb() rseq_smp_lwsync()
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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_smp_lwsync(); \
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____p1; \
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})
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#define rseq_smp_acquire__after_ctrl_dep() rseq_smp_lwsync()
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#define rseq_smp_store_release(p, v) \
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do { \
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rseq_smp_lwsync(); \
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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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/*
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* The __rseq_table section can be used by debuggers to better handle
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* single-stepping through the restartable critical sections.
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*/
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#ifdef __PPC64__
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#define STORE_WORD "std "
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#define LOAD_WORD "ld "
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#define LOADX_WORD "ldx "
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#define CMP_WORD "cmpd "
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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_table, \"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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#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
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RSEQ_INJECT_ASM(1) \
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"lis %%r17, (" __rseq_str(cs_label) ")@highest\n\t" \
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"ori %%r17, %%r17, (" __rseq_str(cs_label) ")@higher\n\t" \
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"rldicr %%r17, %%r17, 32, 31\n\t" \
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"oris %%r17, %%r17, (" __rseq_str(cs_label) ")@high\n\t" \
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"ori %%r17, %%r17, (" __rseq_str(cs_label) ")@l\n\t" \
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"std %%r17, %[" __rseq_str(rseq_cs) "]\n\t" \
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__rseq_str(label) ":\n\t"
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#else /* #ifdef __PPC64__ */
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#define STORE_WORD "stw "
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#define LOAD_WORD "lwz "
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#define LOADX_WORD "lwzx "
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#define CMP_WORD "cmpw "
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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_table, \"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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/* 32-bit only supported on BE */ \
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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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#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
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RSEQ_INJECT_ASM(1) \
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"lis %%r17, (" __rseq_str(cs_label) ")@ha\n\t" \
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"addi %%r17, %%r17, (" __rseq_str(cs_label) ")@l\n\t" \
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"stw %%r17, %[" __rseq_str(rseq_cs) "]\n\t" \
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__rseq_str(label) ":\n\t"
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#endif /* #ifdef __PPC64__ */
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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_CMP_CPU_ID(cpu_id, current_cpu_id, label) \
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RSEQ_INJECT_ASM(2) \
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"lwz %%r17, %[" __rseq_str(current_cpu_id) "]\n\t" \
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"cmpw cr7, %[" __rseq_str(cpu_id) "], %%r17\n\t" \
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"bne- cr7, " __rseq_str(label) "\n\t"
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#define RSEQ_ASM_DEFINE_ABORT(label, 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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"b %l[" __rseq_str(abort_label) "]\n\t" \
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".popsection\n\t"
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/*
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* RSEQ_ASM_OPs: asm operations for rseq
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* RSEQ_ASM_OP_R_*: has hard-code registers in it
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* RSEQ_ASM_OP_* (else): doesn't have hard-code registers(unless cr7)
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*/
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#define RSEQ_ASM_OP_CMPEQ(var, expect, label) \
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LOAD_WORD "%%r17, %[" __rseq_str(var) "]\n\t" \
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CMP_WORD "cr7, %%r17, %[" __rseq_str(expect) "]\n\t" \
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"bne- cr7, " __rseq_str(label) "\n\t"
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#define RSEQ_ASM_OP_CMPNE(var, expectnot, label) \
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LOAD_WORD "%%r17, %[" __rseq_str(var) "]\n\t" \
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CMP_WORD "cr7, %%r17, %[" __rseq_str(expectnot) "]\n\t" \
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"beq- cr7, " __rseq_str(label) "\n\t"
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#define RSEQ_ASM_OP_STORE(value, var) \
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STORE_WORD "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t"
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/* Load @var to r17 */
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#define RSEQ_ASM_OP_R_LOAD(var) \
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LOAD_WORD "%%r17, %[" __rseq_str(var) "]\n\t"
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/* Store r17 to @var */
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#define RSEQ_ASM_OP_R_STORE(var) \
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STORE_WORD "%%r17, %[" __rseq_str(var) "]\n\t"
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/* Add @count to r17 */
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#define RSEQ_ASM_OP_R_ADD(count) \
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"add %%r17, %[" __rseq_str(count) "], %%r17\n\t"
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/* Load (r17 + voffp) to r17 */
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#define RSEQ_ASM_OP_R_LOADX(voffp) \
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LOADX_WORD "%%r17, %[" __rseq_str(voffp) "], %%r17\n\t"
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/* TODO: implement a faster memcpy. */
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#define RSEQ_ASM_OP_R_MEMCPY() \
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"cmpdi %%r19, 0\n\t" \
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"beq 333f\n\t" \
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"addi %%r20, %%r20, -1\n\t" \
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"addi %%r21, %%r21, -1\n\t" \
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"222:\n\t" \
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"lbzu %%r18, 1(%%r20)\n\t" \
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"stbu %%r18, 1(%%r21)\n\t" \
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"addi %%r19, %%r19, -1\n\t" \
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"cmpdi %%r19, 0\n\t" \
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"bne 222b\n\t" \
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"333:\n\t" \
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#define RSEQ_ASM_OP_R_FINAL_STORE(var, post_commit_label) \
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STORE_WORD "%%r17, %[" __rseq_str(var) "]\n\t" \
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__rseq_str(post_commit_label) ":\n\t"
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#define RSEQ_ASM_OP_FINAL_STORE(value, var, post_commit_label) \
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STORE_WORD "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t" \
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__rseq_str(post_commit_label) ":\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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/* 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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/* cmp cpuid */
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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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/* cmp @v equal to @expect */
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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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/* cmp cpuid */
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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/* cmp @v equal to @expect */
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RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
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#endif
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/* final store */
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RSEQ_ASM_OP_FINAL_STORE(newv, v, 2)
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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_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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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", "r17"
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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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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(3, 1f, 2f, 4f) /* start, commit, abort */
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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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/* cmp cpuid */
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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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/* cmp @v not equal to @expectnot */
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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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/* cmp cpuid */
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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/* cmp @v not equal to @expectnot */
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RSEQ_ASM_OP_CMPNE(v, expectnot, %l[error2])
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#endif
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/* load the value of @v */
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RSEQ_ASM_OP_R_LOAD(v)
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/* store it in @load */
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RSEQ_ASM_OP_R_STORE(load)
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/* dereference voffp(v) */
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RSEQ_ASM_OP_R_LOADX(voffp)
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/* final store the value at voffp(v) */
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RSEQ_ASM_OP_R_FINAL_STORE(v, 2)
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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_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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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] "b" (voffp),
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[load] "m" (*load)
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RSEQ_INJECT_INPUT
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: "memory", "cc", "r17"
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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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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(3, 1f, 2f, 4f) /* start, commit, abort */
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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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/* cmp cpuid */
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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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/* cmp cpuid */
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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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/* load the value of @v */
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RSEQ_ASM_OP_R_LOAD(v)
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/* add @count to it */
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RSEQ_ASM_OP_R_ADD(count)
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/* final store */
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RSEQ_ASM_OP_R_FINAL_STORE(v, 2)
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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_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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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", "r17"
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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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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(3, 1f, 2f, 4f) /* start, commit, abort */
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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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/* cmp cpuid */
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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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/* cmp @v equal to @expect */
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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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/* cmp cpuid */
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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/* cmp @v equal to @expect */
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RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
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#endif
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/* try store */
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RSEQ_ASM_OP_STORE(newv2, v2)
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RSEQ_INJECT_ASM(5)
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/* final store */
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RSEQ_ASM_OP_FINAL_STORE(newv, v, 2)
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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] "m" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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/* try store input */
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[v2] "m" (*v2),
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[newv2] "r" (newv2),
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/* final store input */
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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", "r17"
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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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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(3, 1f, 2f, 4f) /* start, commit, abort */
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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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/* cmp cpuid */
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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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/* cmp @v equal to @expect */
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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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/* cmp cpuid */
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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/* cmp @v equal to @expect */
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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 */
|
|
/* 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 */
|
|
/* 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 */
|
|
/* 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 */
|