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selftests/rseq: arm: Template memory ordering and percpu access mode
Introduce a rseq-arm-bits.h template header which is internally included to generate the static inline functions covering: - relaxed and release memory ordering, - per-cpu-id and per-mm-cid per-cpu data access. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20221122203932.231377-13-mathieu.desnoyers@efficios.com
This commit is contained in:
Mathieu Desnoyers
Peter Zijlstra
parent
ae31573843
commit
5bf4aba38a
505
tools/testing/selftests/rseq/rseq-arm-bits.h
Normal file
505
tools/testing/selftests/rseq/rseq-arm-bits.h
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@ -0,0 +1,505 @@
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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* rseq-arm-bits.h
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*
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* (C) Copyright 2016-2022 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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*/
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#include "rseq-bits-template.h"
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#if defined(RSEQ_TEMPLATE_MO_RELAXED) && \
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(defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID))
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static inline __attribute__((always_inline))
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int RSEQ_TEMPLATE_IDENTIFIER(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(9, 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, 3f, 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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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %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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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %l[error2]\n\t"
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#endif
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/* final store */
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"str %[newv], %[v]\n\t"
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"2:\n\t"
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RSEQ_INJECT_ASM(5)
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"b 5f\n\t"
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RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
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"5:\n\t"
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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()->RSEQ_TEMPLATE_CPU_ID_FIELD),
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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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: "r0", "memory", "cc"
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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_TEMPLATE_IDENTIFIER(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(9, 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, 3f, 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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"ldr r0, %[v]\n\t"
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"cmp %[expectnot], r0\n\t"
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"beq %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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"ldr r0, %[v]\n\t"
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"cmp %[expectnot], r0\n\t"
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"beq %l[error2]\n\t"
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#endif
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"str r0, %[load]\n\t"
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"add r0, %[voffp]\n\t"
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"ldr r0, [r0]\n\t"
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/* final store */
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"str r0, %[v]\n\t"
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"2:\n\t"
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RSEQ_INJECT_ASM(5)
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"b 5f\n\t"
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RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
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"5:\n\t"
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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()->RSEQ_TEMPLATE_CPU_ID_FIELD),
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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] "Ir" (voffp),
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[load] "m" (*load)
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RSEQ_INJECT_INPUT
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: "r0", "memory", "cc"
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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_TEMPLATE_IDENTIFIER(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(9, 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, 3f, 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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"ldr r0, %[v]\n\t"
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"add r0, %[count]\n\t"
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/* final store */
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"str r0, %[v]\n\t"
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"2:\n\t"
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RSEQ_INJECT_ASM(4)
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"b 5f\n\t"
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RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
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"5:\n\t"
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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()->RSEQ_TEMPLATE_CPU_ID_FIELD),
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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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[count] "Ir" (count)
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RSEQ_INJECT_INPUT
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: "r0", "memory", "cc"
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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:
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rseq_after_asm_goto();
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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_TEMPLATE_IDENTIFIER(rseq_cmpeqv_cmpeqv_storev)(intptr_t *v, intptr_t expect,
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intptr_t *v2, intptr_t expect2,
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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(9, 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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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error3])
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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, 3f, 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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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %l[cmpfail]\n\t"
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RSEQ_INJECT_ASM(4)
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"ldr r0, %[v2]\n\t"
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"cmp %[expect2], r0\n\t"
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"bne %l[cmpfail]\n\t"
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RSEQ_INJECT_ASM(5)
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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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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %l[error2]\n\t"
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"ldr r0, %[v2]\n\t"
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"cmp %[expect2], r0\n\t"
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"bne %l[error3]\n\t"
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#endif
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/* final store */
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"str %[newv], %[v]\n\t"
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"2:\n\t"
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RSEQ_INJECT_ASM(6)
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"b 5f\n\t"
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RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
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"5:\n\t"
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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()->RSEQ_TEMPLATE_CPU_ID_FIELD),
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[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
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/* cmp2 input */
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[v2] "m" (*v2),
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[expect2] "r" (expect2),
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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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: "r0", "memory", "cc"
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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, error3
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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("1st expected value comparison failed");
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error3:
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rseq_after_asm_goto();
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rseq_bug("2nd expected value comparison failed");
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#endif
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}
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#endif /* #if defined(RSEQ_TEMPLATE_MO_RELAXED) &&
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(defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID)) */
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#if (defined(RSEQ_TEMPLATE_MO_RELAXED) || defined(RSEQ_TEMPLATE_MO_RELEASE)) && \
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(defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID))
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static inline __attribute__((always_inline))
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int RSEQ_TEMPLATE_IDENTIFIER(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(9, 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, 3f, 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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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %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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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %l[error2]\n\t"
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#endif
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/* try store */
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"str %[newv2], %[v2]\n\t"
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RSEQ_INJECT_ASM(5)
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#ifdef RSEQ_TEMPLATE_MO_RELEASE
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"dmb\n\t" /* full mb provides store-release */
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#endif
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/* final store */
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"str %[newv], %[v]\n\t"
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"2:\n\t"
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RSEQ_INJECT_ASM(6)
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"b 5f\n\t"
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RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
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"5:\n\t"
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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()->RSEQ_TEMPLATE_CPU_ID_FIELD),
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[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
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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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: "r0", "memory", "cc"
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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_TEMPLATE_IDENTIFIER(rseq_cmpeqv_trymemcpy_storev)(intptr_t *v, intptr_t expect,
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void *dst, void *src, size_t len,
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intptr_t newv, int cpu)
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{
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uint32_t rseq_scratch[3];
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RSEQ_INJECT_C(9)
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(9, 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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"str %[src], %[rseq_scratch0]\n\t"
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"str %[dst], %[rseq_scratch1]\n\t"
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"str %[len], %[rseq_scratch2]\n\t"
|
||||
/* Start rseq by storing table entry pointer into rseq_cs. */
|
||||
RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||||
RSEQ_INJECT_ASM(3)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne 5f\n\t"
|
||||
RSEQ_INJECT_ASM(4)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne 7f\n\t"
|
||||
#endif
|
||||
/* try memcpy */
|
||||
"cmp %[len], #0\n\t" \
|
||||
"beq 333f\n\t" \
|
||||
"222:\n\t" \
|
||||
"ldrb %%r0, [%[src]]\n\t" \
|
||||
"strb %%r0, [%[dst]]\n\t" \
|
||||
"adds %[src], #1\n\t" \
|
||||
"adds %[dst], #1\n\t" \
|
||||
"subs %[len], #1\n\t" \
|
||||
"bne 222b\n\t" \
|
||||
"333:\n\t" \
|
||||
RSEQ_INJECT_ASM(5)
|
||||
#ifdef RSEQ_TEMPLATE_MO_RELEASE
|
||||
"dmb\n\t" /* full mb provides store-release */
|
||||
#endif
|
||||
/* final store */
|
||||
"str %[newv], %[v]\n\t"
|
||||
"2:\n\t"
|
||||
RSEQ_INJECT_ASM(6)
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t"
|
||||
"b 8f\n\t"
|
||||
RSEQ_ASM_DEFINE_ABORT(3, 4,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
abort, 1b, 2b, 4f)
|
||||
RSEQ_ASM_DEFINE_CMPFAIL(5,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
cmpfail)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_DEFINE_CMPFAIL(6,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
error1)
|
||||
RSEQ_ASM_DEFINE_CMPFAIL(7,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
error2)
|
||||
#endif
|
||||
"8:\n\t"
|
||||
: /* gcc asm goto does not allow outputs */
|
||||
: [cpu_id] "r" (cpu),
|
||||
[current_cpu_id] "m" (rseq_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
|
||||
[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
|
||||
: "r0", "memory", "cc"
|
||||
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
|
||||
}
|
||||
|
||||
#endif /* #if (defined(RSEQ_TEMPLATE_MO_RELAXED) || defined(RSEQ_TEMPLATE_MO_RELEASE)) &&
|
||||
(defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID)) */
|
||||
|
||||
#include "rseq-bits-reset.h"
|
||||
@ -2,7 +2,7 @@
|
||||
/*
|
||||
* rseq-arm.h
|
||||
*
|
||||
* (C) Copyright 2016-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
|
||||
* (C) Copyright 2016-2022 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
|
||||
*/
|
||||
|
||||
/*
|
||||
@ -143,679 +143,34 @@ do { \
|
||||
teardown \
|
||||
"b %l[" __rseq_str(cmpfail_label) "]\n\t"
|
||||
|
||||
static inline __attribute__((always_inline))
|
||||
int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
|
||||
{
|
||||
RSEQ_INJECT_C(9)
|
||||
/* Per-cpu-id indexing. */
|
||||
|
||||
__asm__ __volatile__ goto (
|
||||
RSEQ_ASM_DEFINE_TABLE(9, 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, 3f, rseq_cs)
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||||
RSEQ_INJECT_ASM(3)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne %l[cmpfail]\n\t"
|
||||
RSEQ_INJECT_ASM(4)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne %l[error2]\n\t"
|
||||
#endif
|
||||
/* final store */
|
||||
"str %[newv], %[v]\n\t"
|
||||
"2:\n\t"
|
||||
RSEQ_INJECT_ASM(5)
|
||||
"b 5f\n\t"
|
||||
RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
|
||||
"5:\n\t"
|
||||
: /* 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),
|
||||
[v] "m" (*v),
|
||||
[expect] "r" (expect),
|
||||
[newv] "r" (newv)
|
||||
RSEQ_INJECT_INPUT
|
||||
: "r0", "memory", "cc"
|
||||
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
|
||||
}
|
||||
#define RSEQ_TEMPLATE_CPU_ID
|
||||
#define RSEQ_TEMPLATE_MO_RELAXED
|
||||
#include "rseq-arm-bits.h"
|
||||
#undef RSEQ_TEMPLATE_MO_RELAXED
|
||||
|
||||
static inline __attribute__((always_inline))
|
||||
int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
|
||||
long voffp, intptr_t *load, int cpu)
|
||||
{
|
||||
RSEQ_INJECT_C(9)
|
||||
#define RSEQ_TEMPLATE_MO_RELEASE
|
||||
#include "rseq-arm-bits.h"
|
||||
#undef RSEQ_TEMPLATE_MO_RELEASE
|
||||
#undef RSEQ_TEMPLATE_CPU_ID
|
||||
|
||||
__asm__ __volatile__ goto (
|
||||
RSEQ_ASM_DEFINE_TABLE(9, 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, 3f, rseq_cs)
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||||
RSEQ_INJECT_ASM(3)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expectnot], r0\n\t"
|
||||
"beq %l[cmpfail]\n\t"
|
||||
RSEQ_INJECT_ASM(4)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expectnot], r0\n\t"
|
||||
"beq %l[error2]\n\t"
|
||||
#endif
|
||||
"str r0, %[load]\n\t"
|
||||
"add r0, %[voffp]\n\t"
|
||||
"ldr r0, [r0]\n\t"
|
||||
/* final store */
|
||||
"str r0, %[v]\n\t"
|
||||
"2:\n\t"
|
||||
RSEQ_INJECT_ASM(5)
|
||||
"b 5f\n\t"
|
||||
RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
|
||||
"5:\n\t"
|
||||
: /* 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),
|
||||
[expectnot] "r" (expectnot),
|
||||
[voffp] "Ir" (voffp),
|
||||
[load] "m" (*load)
|
||||
RSEQ_INJECT_INPUT
|
||||
: "r0", "memory", "cc"
|
||||
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
|
||||
}
|
||||
/* Per-mm-cid indexing. */
|
||||
|
||||
static inline __attribute__((always_inline))
|
||||
int rseq_addv(intptr_t *v, intptr_t count, int cpu)
|
||||
{
|
||||
RSEQ_INJECT_C(9)
|
||||
#define RSEQ_TEMPLATE_MM_CID
|
||||
#define RSEQ_TEMPLATE_MO_RELAXED
|
||||
#include "rseq-arm-bits.h"
|
||||
#undef RSEQ_TEMPLATE_MO_RELAXED
|
||||
|
||||
__asm__ __volatile__ goto (
|
||||
RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
|
||||
#endif
|
||||
/* Start rseq by storing table entry pointer into rseq_cs. */
|
||||
RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||||
RSEQ_INJECT_ASM(3)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
||||
#endif
|
||||
"ldr r0, %[v]\n\t"
|
||||
"add r0, %[count]\n\t"
|
||||
/* final store */
|
||||
"str r0, %[v]\n\t"
|
||||
"2:\n\t"
|
||||
RSEQ_INJECT_ASM(4)
|
||||
"b 5f\n\t"
|
||||
RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
|
||||
"5:\n\t"
|
||||
: /* 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),
|
||||
[v] "m" (*v),
|
||||
[count] "Ir" (count)
|
||||
RSEQ_INJECT_INPUT
|
||||
: "r0", "memory", "cc"
|
||||
RSEQ_INJECT_CLOBBER
|
||||
: abort
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
, error1
|
||||
#endif
|
||||
);
|
||||
rseq_after_asm_goto();
|
||||
return 0;
|
||||
abort:
|
||||
rseq_after_asm_goto();
|
||||
RSEQ_INJECT_FAILED
|
||||
return -1;
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
error1:
|
||||
rseq_after_asm_goto();
|
||||
rseq_bug("cpu_id comparison failed");
|
||||
#endif
|
||||
}
|
||||
#define RSEQ_TEMPLATE_MO_RELEASE
|
||||
#include "rseq-arm-bits.h"
|
||||
#undef RSEQ_TEMPLATE_MO_RELEASE
|
||||
#undef RSEQ_TEMPLATE_MM_CID
|
||||
|
||||
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)
|
||||
/* APIs which are not based on cpu ids. */
|
||||
|
||||
__asm__ __volatile__ goto (
|
||||
RSEQ_ASM_DEFINE_TABLE(9, 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, 3f, rseq_cs)
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||||
RSEQ_INJECT_ASM(3)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne %l[cmpfail]\n\t"
|
||||
RSEQ_INJECT_ASM(4)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne %l[error2]\n\t"
|
||||
#endif
|
||||
/* try store */
|
||||
"str %[newv2], %[v2]\n\t"
|
||||
RSEQ_INJECT_ASM(5)
|
||||
/* final store */
|
||||
"str %[newv], %[v]\n\t"
|
||||
"2:\n\t"
|
||||
RSEQ_INJECT_ASM(6)
|
||||
"b 5f\n\t"
|
||||
RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
|
||||
"5:\n\t"
|
||||
: /* 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
|
||||
: "r0", "memory", "cc"
|
||||
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
|
||||
}
|
||||
|
||||
static inline __attribute__((always_inline))
|
||||
int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
|
||||
intptr_t *v2, intptr_t newv2,
|
||||
intptr_t newv, int cpu)
|
||||
{
|
||||
RSEQ_INJECT_C(9)
|
||||
|
||||
__asm__ __volatile__ goto (
|
||||
RSEQ_ASM_DEFINE_TABLE(9, 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, 3f, rseq_cs)
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||||
RSEQ_INJECT_ASM(3)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne %l[cmpfail]\n\t"
|
||||
RSEQ_INJECT_ASM(4)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne %l[error2]\n\t"
|
||||
#endif
|
||||
/* try store */
|
||||
"str %[newv2], %[v2]\n\t"
|
||||
RSEQ_INJECT_ASM(5)
|
||||
"dmb\n\t" /* full mb provides store-release */
|
||||
/* final store */
|
||||
"str %[newv], %[v]\n\t"
|
||||
"2:\n\t"
|
||||
RSEQ_INJECT_ASM(6)
|
||||
"b 5f\n\t"
|
||||
RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
|
||||
"5:\n\t"
|
||||
: /* 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
|
||||
: "r0", "memory", "cc"
|
||||
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
|
||||
}
|
||||
|
||||
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(9, 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, 3f, rseq_cs)
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||||
RSEQ_INJECT_ASM(3)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne %l[cmpfail]\n\t"
|
||||
RSEQ_INJECT_ASM(4)
|
||||
"ldr r0, %[v2]\n\t"
|
||||
"cmp %[expect2], r0\n\t"
|
||||
"bne %l[cmpfail]\n\t"
|
||||
RSEQ_INJECT_ASM(5)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne %l[error2]\n\t"
|
||||
"ldr r0, %[v2]\n\t"
|
||||
"cmp %[expect2], r0\n\t"
|
||||
"bne %l[error3]\n\t"
|
||||
#endif
|
||||
/* final store */
|
||||
"str %[newv], %[v]\n\t"
|
||||
"2:\n\t"
|
||||
RSEQ_INJECT_ASM(6)
|
||||
"b 5f\n\t"
|
||||
RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
|
||||
"5:\n\t"
|
||||
: /* 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
|
||||
: "r0", "memory", "cc"
|
||||
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)
|
||||
{
|
||||
uint32_t rseq_scratch[3];
|
||||
|
||||
RSEQ_INJECT_C(9)
|
||||
|
||||
__asm__ __volatile__ goto (
|
||||
RSEQ_ASM_DEFINE_TABLE(9, 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
|
||||
"str %[src], %[rseq_scratch0]\n\t"
|
||||
"str %[dst], %[rseq_scratch1]\n\t"
|
||||
"str %[len], %[rseq_scratch2]\n\t"
|
||||
/* Start rseq by storing table entry pointer into rseq_cs. */
|
||||
RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||||
RSEQ_INJECT_ASM(3)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne 5f\n\t"
|
||||
RSEQ_INJECT_ASM(4)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne 7f\n\t"
|
||||
#endif
|
||||
/* try memcpy */
|
||||
"cmp %[len], #0\n\t" \
|
||||
"beq 333f\n\t" \
|
||||
"222:\n\t" \
|
||||
"ldrb %%r0, [%[src]]\n\t" \
|
||||
"strb %%r0, [%[dst]]\n\t" \
|
||||
"adds %[src], #1\n\t" \
|
||||
"adds %[dst], #1\n\t" \
|
||||
"subs %[len], #1\n\t" \
|
||||
"bne 222b\n\t" \
|
||||
"333:\n\t" \
|
||||
RSEQ_INJECT_ASM(5)
|
||||
/* final store */
|
||||
"str %[newv], %[v]\n\t"
|
||||
"2:\n\t"
|
||||
RSEQ_INJECT_ASM(6)
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t"
|
||||
"b 8f\n\t"
|
||||
RSEQ_ASM_DEFINE_ABORT(3, 4,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
abort, 1b, 2b, 4f)
|
||||
RSEQ_ASM_DEFINE_CMPFAIL(5,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
cmpfail)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_DEFINE_CMPFAIL(6,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
error1)
|
||||
RSEQ_ASM_DEFINE_CMPFAIL(7,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
error2)
|
||||
#endif
|
||||
"8:\n\t"
|
||||
: /* 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
|
||||
: "r0", "memory", "cc"
|
||||
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
|
||||
}
|
||||
|
||||
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)
|
||||
{
|
||||
uint32_t rseq_scratch[3];
|
||||
|
||||
RSEQ_INJECT_C(9)
|
||||
|
||||
__asm__ __volatile__ goto (
|
||||
RSEQ_ASM_DEFINE_TABLE(9, 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
|
||||
"str %[src], %[rseq_scratch0]\n\t"
|
||||
"str %[dst], %[rseq_scratch1]\n\t"
|
||||
"str %[len], %[rseq_scratch2]\n\t"
|
||||
/* Start rseq by storing table entry pointer into rseq_cs. */
|
||||
RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
||||
RSEQ_INJECT_ASM(3)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne 5f\n\t"
|
||||
RSEQ_INJECT_ASM(4)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
|
||||
"ldr r0, %[v]\n\t"
|
||||
"cmp %[expect], r0\n\t"
|
||||
"bne 7f\n\t"
|
||||
#endif
|
||||
/* try memcpy */
|
||||
"cmp %[len], #0\n\t" \
|
||||
"beq 333f\n\t" \
|
||||
"222:\n\t" \
|
||||
"ldrb %%r0, [%[src]]\n\t" \
|
||||
"strb %%r0, [%[dst]]\n\t" \
|
||||
"adds %[src], #1\n\t" \
|
||||
"adds %[dst], #1\n\t" \
|
||||
"subs %[len], #1\n\t" \
|
||||
"bne 222b\n\t" \
|
||||
"333:\n\t" \
|
||||
RSEQ_INJECT_ASM(5)
|
||||
"dmb\n\t" /* full mb provides store-release */
|
||||
/* final store */
|
||||
"str %[newv], %[v]\n\t"
|
||||
"2:\n\t"
|
||||
RSEQ_INJECT_ASM(6)
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t"
|
||||
"b 8f\n\t"
|
||||
RSEQ_ASM_DEFINE_ABORT(3, 4,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
abort, 1b, 2b, 4f)
|
||||
RSEQ_ASM_DEFINE_CMPFAIL(5,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
cmpfail)
|
||||
#ifdef RSEQ_COMPARE_TWICE
|
||||
RSEQ_ASM_DEFINE_CMPFAIL(6,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
error1)
|
||||
RSEQ_ASM_DEFINE_CMPFAIL(7,
|
||||
/* teardown */
|
||||
"ldr %[len], %[rseq_scratch2]\n\t"
|
||||
"ldr %[dst], %[rseq_scratch1]\n\t"
|
||||
"ldr %[src], %[rseq_scratch0]\n\t",
|
||||
error2)
|
||||
#endif
|
||||
"8:\n\t"
|
||||
: /* 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
|
||||
: "r0", "memory", "cc"
|
||||
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
|
||||
}
|
||||
#define RSEQ_TEMPLATE_CPU_ID_NONE
|
||||
#define RSEQ_TEMPLATE_MO_RELAXED
|
||||
#include "rseq-arm-bits.h"
|
||||
#undef RSEQ_TEMPLATE_MO_RELAXED
|
||||
#undef RSEQ_TEMPLATE_CPU_ID_NONE
|
||||
|
||||
Loading…
Reference in New Issue
Block a user