Re: [PATCH 1/3] selftests/rseq: Add 64bit LoongArch support

From: Huacai Chen
Date: Thu Oct 26 2023 - 08:08:16 EST

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In reply to: Huacai Chen: "Re: [PATCH 2/3] LoongArch: Add RSEQ_SIG break code definition"
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Hi,

1, The two patches should be marked as [1/2] and [2/2], not [1/3] and [2/3].
2, It is better to exchange the two patches' order.
3, Please add some commit messages, don't leave empty.

Huacai

On Thu, Oct 26, 2023 at 7:45 PM Huang Pei <huangpei@xxxxxxxxxxx> wrote:
>
> Signed-off-by: Huang Pei <huangpei@xxxxxxxxxxx>
> ---
> tools/testing/selftests/rseq/param_test.c | 20 +
> .../selftests/rseq/rseq-loongarch-bits.h | 463 ++++++++++++++++++
> .../rseq/rseq-loongarch-thread-pointer.h | 22 +
> tools/testing/selftests/rseq/rseq-loongarch.h | 140 ++++++
> .../selftests/rseq/rseq-thread-pointer.h | 2 +
> tools/testing/selftests/rseq/rseq.h | 2 +
> 6 files changed, 649 insertions(+)
> create mode 100644 tools/testing/selftests/rseq/rseq-loongarch-bits.h
> create mode 100644 tools/testing/selftests/rseq/rseq-loongarch-thread-pointer.h
> create mode 100644 tools/testing/selftests/rseq/rseq-loongarch.h
>
> diff --git a/tools/testing/selftests/rseq/param_test.c b/tools/testing/selftests/rseq/param_test.c
> index bf951a490bb4..e930aa73c219 100644
> --- a/tools/testing/selftests/rseq/param_test.c
> +++ b/tools/testing/selftests/rseq/param_test.c
> @@ -227,7 +227,27 @@ unsigned int yield_mod_cnt, nr_abort;
> "bnez " INJECT_ASM_REG ", 222b\n\t" \
> "333:\n\t"
>
> +#elif defined(__loongarch__)
> +#define RSEQ_INJECT_INPUT \
> + , [loop_cnt_1]"m"(loop_cnt[1]) \
> + , [loop_cnt_2]"m"(loop_cnt[2]) \
> + , [loop_cnt_3]"m"(loop_cnt[3]) \
> + , [loop_cnt_4]"m"(loop_cnt[4]) \
> + , [loop_cnt_5]"m"(loop_cnt[5]) \
> + , [loop_cnt_6]"m"(loop_cnt[6])
> +
> +#define INJECT_ASM_REG "$r12"
> +
> +#define RSEQ_INJECT_CLOBBER \
> + , INJECT_ASM_REG
>
> +#define RSEQ_INJECT_ASM(n) \
> + "ld.w " INJECT_ASM_REG ", %[loop_cnt_" #n "]\n\t" \
> + "beqz " INJECT_ASM_REG ", 333f\n\t" \
> + "222:\n\t" \
> + "addi.w " INJECT_ASM_REG "," INJECT_ASM_REG ", -1\n\t" \
> + "bnez " INJECT_ASM_REG ", 222b\n\t" \
> + "333:\n\t"
> #else
> #error unsupported target
> #endif
> diff --git a/tools/testing/selftests/rseq/rseq-loongarch-bits.h b/tools/testing/selftests/rseq/rseq-loongarch-bits.h
> new file mode 100644
> index 000000000000..cf933c1a2100
> --- /dev/null
> +++ b/tools/testing/selftests/rseq/rseq-loongarch-bits.h
> @@ -0,0 +1,463 @@
> +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
> +/*
> + * Author: Huang Pei <huangpei@xxxxxxxxxxx>
> + * (C) Copyright 2023 Loongson Technology Corporation Limited
> + * (C) Copyright 2016-2022 - Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
> + * (C) Copyright 2018 MIPS Tech LLC
> + * (C) Copyright 2018 - Paul Burton <paul.burton@xxxxxxxx>
> + */
> +#include "rseq-bits-template.h"
> +
> +#if defined(RSEQ_TEMPLATE_MO_RELAXED) && \
> + (defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID))
> +
> +static inline __attribute__((always_inline))
> +int RSEQ_TEMPLATE_IDENTIFIER(rseq_cmpeqv_storev)(intptr_t *v, intptr_t expect, 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)
> + LONG_L " $r4, %[v]\n\t"
> + "bne $r4, %[expect], %l[cmpfail]\n\t"
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
> + LONG_L " $r4, %[v]\n\t"
> + "bne $r4, %[expect], %l[error2]\n\t"
> +#endif
> + /* final store */
> + LONG_S " %[newv], %[v]\n\t"
> + "2:\n\t"
> + RSEQ_INJECT_ASM(5)
> + "b 5f\n\t"
> + RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
> + "5:\n\t"
> + : /* gcc asm goto does not allow outputs */
> + : [cpu_id] "r" (cpu),
> + [current_cpu_id] "m" (rseq_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
> + [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
> + [v] "m" (*v),
> + [expect] "r" (expect),
> + [newv] "r" (newv)
> + RSEQ_INJECT_INPUT
> + : "$r4", "memory"
> + 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_TEMPLATE_IDENTIFIER(rseq_cmpnev_storeoffp_load)(intptr_t *v, intptr_t expectnot,
> + long voffp, intptr_t *load, 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)
> + LONG_L " $r4, %[v]\n\t"
> + "beq $r4, %[expectnot], %l[cmpfail]\n\t"
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
> + LONG_L " $r4, %[v]\n\t"
> + "beq $r4, %[expectnot], %l[error2]\n\t"
> +#endif
> + LONG_S " $r4, %[load]\n\t"
> + LONG_ADDI " $r4, $r4, %[voffp]\n\t"
> + LONG_L " $r4, $r4, 0\n\t"
> + /* final store */
> + LONG_S " $r4, %[v]\n\t"
> + "2:\n\t"
> + RSEQ_INJECT_ASM(5)
> + "b 5f\n\t"
> + RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
> + "5:\n\t"
> + : /* gcc asm goto does not allow outputs */
> + : [cpu_id] "r" (cpu),
> + [current_cpu_id] "m" (rseq_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
> + [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
> + /* final store input */
> + [v] "m" (*v),
> + [expectnot] "r" (expectnot),
> + [voffp] "Ir" (voffp),
> + [load] "m" (*load)
> + RSEQ_INJECT_INPUT
> + : "$r4", "memory"
> + 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_TEMPLATE_IDENTIFIER(rseq_addv)(intptr_t *v, intptr_t count, int cpu)
> +{
> + RSEQ_INJECT_C(9)
> +
> + __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
> + LONG_L " $r4, %[v]\n\t"
> + LONG_ADDI " $r4, $r4, %[count]\n\t"
> + /* final store */
> + LONG_S " $r4, %[v]\n\t"
> + "2:\n\t"
> + RSEQ_INJECT_ASM(4)
> + "b 5f\n\t"
> + RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
> + "5:\n\t"
> + : /* gcc asm goto does not allow outputs */
> + : [cpu_id] "r" (cpu),
> + [current_cpu_id] "m" (rseq_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
> + [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
> + [v] "m" (*v),
> + [count] "Ir" (count)
> + RSEQ_INJECT_INPUT
> + : "$r4", "memory"
> + RSEQ_INJECT_CLOBBER
> + : abort
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1
> +#endif
> + );
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +#endif
> +}
> +
> +static inline __attribute__((always_inline))
> +int RSEQ_TEMPLATE_IDENTIFIER(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)
> + LONG_L " $r4, %[v]\n\t"
> + "bne $r4, %[expect], %l[cmpfail]\n\t"
> + RSEQ_INJECT_ASM(4)
> + LONG_L " $r4, %[v2]\n\t"
> + "bne $r4, %[expect2], %l[cmpfail]\n\t"
> + RSEQ_INJECT_ASM(5)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
> + LONG_L " $r4, %[v]\n\t"
> + "bne $r4, %[expect], %l[error2]\n\t"
> + LONG_L " $r4, %[v2]\n\t"
> + "bne $r4, %[expect2], %l[error3]\n\t"
> +#endif
> + /* final store */
> + LONG_S " %[newv], %[v]\n\t"
> + "2:\n\t"
> + RSEQ_INJECT_ASM(6)
> + "b 5f\n\t"
> + RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
> + "5:\n\t"
> + : /* gcc asm goto does not allow outputs */
> + : [cpu_id] "r" (cpu),
> + [current_cpu_id] "m" (rseq_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
> + [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
> + /* cmp2 input */
> + [v2] "m" (*v2),
> + [expect2] "r" (expect2),
> + /* final store input */
> + [v] "m" (*v),
> + [expect] "r" (expect),
> + [newv] "r" (newv)
> + RSEQ_INJECT_INPUT
> + : "$r4", "memory"
> + 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
> +}
> +
> +#endif /* #if defined(RSEQ_TEMPLATE_MO_RELAXED) &&
> + (defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID)) */
> +
> +#if (defined(RSEQ_TEMPLATE_MO_RELAXED) || defined(RSEQ_TEMPLATE_MO_RELEASE)) && \
> + (defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID))
> +
> +static inline __attribute__((always_inline))
> +int RSEQ_TEMPLATE_IDENTIFIER(rseq_cmpeqv_trystorev_storev)(intptr_t *v, intptr_t expect,
> + intptr_t *v2, intptr_t newv2,
> + intptr_t newv, int cpu)
> +{
> + RSEQ_INJECT_C(9)
> +
> + __asm__ __volatile__ goto (
> + RSEQ_ASM_DEFINE_TABLE(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)
> + LONG_L " $r4, %[v]\n\t"
> + "bne $r4, %[expect], %l[cmpfail]\n\t"
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
> + LONG_L " $r4, %[v]\n\t"
> + "bne $r4, %[expect], %l[error2]\n\t"
> +#endif
> + /* try store */
> + LONG_S " %[newv2], %[v2]\n\t"
> + RSEQ_INJECT_ASM(5)
> +#ifdef RSEQ_TEMPLATE_MO_RELEASE
> + "dbar 0x12\n\t" /* store-release */
> +#endif
> + /* final store */
> + LONG_S " %[newv], %[v]\n\t"
> + "2:\n\t"
> + RSEQ_INJECT_ASM(6)
> + "b 5f\n\t"
> + RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
> + "5:\n\t"
> + : /* gcc asm goto does not allow outputs */
> + : [cpu_id] "r" (cpu),
> + [current_cpu_id] "m" (rseq_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
> + [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
> + /* try store input */
> + [v2] "m" (*v2),
> + [newv2] "r" (newv2),
> + /* final store input */
> + [v] "m" (*v),
> + [expect] "r" (expect),
> + [newv] "r" (newv)
> + RSEQ_INJECT_INPUT
> + : "$r4", "memory"
> + 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_TEMPLATE_IDENTIFIER(rseq_cmpeqv_trymemcpy_storev)(intptr_t *v, intptr_t expect,
> + void *dst, void *src, size_t len,
> + intptr_t newv, int cpu)
> +{
> + uintptr_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
> + LONG_S " %[src], %[rseq_scratch0]\n\t"
> + LONG_S " %[dst], %[rseq_scratch1]\n\t"
> + LONG_S " %[len], %[rseq_scratch2]\n\t"
> + /* Start rseq by storing table entry pointer into rseq_cs. */
> + RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
> + RSEQ_INJECT_ASM(3)
> + LONG_L " $r4, %[v]\n\t"
> + "bne $r4, %[expect], 5f\n\t"
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
> + LONG_L " $r4, %[v]\n\t"
> + "bne $r4, %[expect], 7f\n\t"
> +#endif
> + /* try memcpy */
> + "beqz %[len], 333f\n\t" \
> + "222:\n\t" \
> + "ld.b $r4, %[src], 0\n\t" \
> + "st.b $r4, %[dst], 0\n\t" \
> + LONG_ADDI " %[src], %[src], 1\n\t" \
> + LONG_ADDI " %[dst], %[dst], 1\n\t" \
> + LONG_ADDI " %[len], %[len], -1\n\t" \
> + "bnez %[len], 222b\n\t" \
> + "333:\n\t" \
> + RSEQ_INJECT_ASM(5)
> +#ifdef RSEQ_TEMPLATE_MO_RELEASE
> + "dbar 0x12\n\t" /* store-release */
> +#endif
> + /* final store */
> + LONG_S " %[newv], %[v]\n\t"
> + "2:\n\t"
> + RSEQ_INJECT_ASM(6)
> + /* teardown */
> + LONG_L " %[len], %[rseq_scratch2]\n\t"
> + LONG_L " %[dst], %[rseq_scratch1]\n\t"
> + LONG_L " %[src], %[rseq_scratch0]\n\t"
> + "b 8f\n\t"
> + RSEQ_ASM_DEFINE_ABORT(3, 4,
> + /* teardown */
> + LONG_L " %[len], %[rseq_scratch2]\n\t"
> + LONG_L " %[dst], %[rseq_scratch1]\n\t"
> + LONG_L " %[src], %[rseq_scratch0]\n\t",
> + abort, 1b, 2b, 4f)
> + RSEQ_ASM_DEFINE_CMPFAIL(5,
> + /* teardown */
> + LONG_L " %[len], %[rseq_scratch2]\n\t"
> + LONG_L " %[dst], %[rseq_scratch1]\n\t"
> + LONG_L " %[src], %[rseq_scratch0]\n\t",
> + cmpfail)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_CMPFAIL(6,
> + /* teardown */
> + LONG_L " %[len], %[rseq_scratch2]\n\t"
> + LONG_L " %[dst], %[rseq_scratch1]\n\t"
> + LONG_L " %[src], %[rseq_scratch0]\n\t",
> + error1)
> + RSEQ_ASM_DEFINE_CMPFAIL(7,
> + /* teardown */
> + LONG_L " %[len], %[rseq_scratch2]\n\t"
> + LONG_L " %[dst], %[rseq_scratch1]\n\t"
> + LONG_L " %[src], %[rseq_scratch0]\n\t",
> + error2)
> +#endif
> + "8:\n\t"
> + : /* gcc asm goto does not allow outputs */
> + : [cpu_id] "r" (cpu),
> + [current_cpu_id] "m" (rseq_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
> + [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
> + /* final store input */
> + [v] "m" (*v),
> + [expect] "r" (expect),
> + [newv] "r" (newv),
> + /* try memcpy input */
> + [dst] "r" (dst),
> + [src] "r" (src),
> + [len] "r" (len),
> + [rseq_scratch0] "m" (rseq_scratch[0]),
> + [rseq_scratch1] "m" (rseq_scratch[1]),
> + [rseq_scratch2] "m" (rseq_scratch[2])
> + RSEQ_INJECT_INPUT
> + : "$r4", "memory"
> + 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
> +}
> +
> +#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"
> diff --git a/tools/testing/selftests/rseq/rseq-loongarch-thread-pointer.h b/tools/testing/selftests/rseq/rseq-loongarch-thread-pointer.h
> new file mode 100644
> index 000000000000..7dc990687982
> --- /dev/null
> +++ b/tools/testing/selftests/rseq/rseq-loongarch-thread-pointer.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: MIT */
> +/* SPDX-FileCopyrightText: 2023 Huang Pei <huangpei@xxxxxxxxxxx> */
> +
> +#ifndef _RSEQ_LOONGARCH_THREAD_POINTER
> +#define _RSEQ_LOONGARCH_THREAD_POINTER
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +static inline void *rseq_thread_pointer(void)
> +{
> + register void *__result asm ("$2");
> + asm ("" : "=r" (__result));
> + return __result;
> +}
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif
> diff --git a/tools/testing/selftests/rseq/rseq-loongarch.h b/tools/testing/selftests/rseq/rseq-loongarch.h
> new file mode 100644
> index 000000000000..37aae463edde
> --- /dev/null
> +++ b/tools/testing/selftests/rseq/rseq-loongarch.h
> @@ -0,0 +1,140 @@
> +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
> +/*
> + * Author: Huang Pei <huangpei@xxxxxxxxxxx>
> + * (C) Copyright 2023 Loongson Technology Corporation Limited
> + * (C) Copyright 2016-2022 - Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
> + * (C) Copyright 2018 MIPS Tech LLC
> + * (C) Copyright 2018 - Paul Burton <paul.burton@xxxxxxxx>
> + */
> +
> +/*
> + * RSEQ_SIG use "break 0x10" instruction.
> + */
> +
> +# define RSEQ_SIG 0x002a0010
> +
> +
> +
> +#define rseq_smp_mb() __asm__ __volatile__ ("dbar 0x10" ::: "memory")
> +#define rseq_smp_rmb() __asm__ __volatile__ ("dbar 0x15" ::: "memory")
> +#define rseq_smp_wmb() __asm__ __volatile__ ("dbar 0x1a" ::: "memory")
> +
> +#define rseq_smp_load_acquire(p) \
> +__extension__ ({ \
> + rseq_unqual_scalar_typeof(*(p)) ____p1 = RSEQ_READ_ONCE(*(p)); \
> + __asm__ __volatile__("dbar 0x14" ::: "memory"); \
> + ____p1; \
> +})
> +
> +#define rseq_smp_acquire__after_ctrl_dep() rseq_smp_rmb()
> +
> +#define rseq_smp_store_release(p, v) \
> +do { \
> + __asm__ __volatile__("dbar 0x12" ::: "memory"); \
> + RSEQ_WRITE_ONCE(*(p), v); \
> +} while (0)
> +
> +# define LONG ".dword"
> +# define LONG_LA "la.local"
> +# define LONG_L "ld.d"
> +# define LONG_S "st.d"
> +# define LONG_ADDI "addi.d"
> +# define U32_U64_PAD(x) x
> +
> +#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
> + post_commit_offset, abort_ip) \
> + ".pushsection __rseq_cs, \"aw\"\n\t" \
> + ".balign 32\n\t" \
> + __rseq_str(label) ":\n\t" \
> + ".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
> + LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
> + LONG " " U32_U64_PAD(__rseq_str(post_commit_offset)) "\n\t" \
> + LONG " " U32_U64_PAD(__rseq_str(abort_ip)) "\n\t" \
> + ".popsection\n\t" \
> + ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
> + LONG " " U32_U64_PAD(__rseq_str(label) "b") "\n\t" \
> + ".popsection\n\t"
> +
> +#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
> + __RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \
> + (post_commit_ip - start_ip), abort_ip)
> +/*
> + * Exit points of a rseq critical section consist of all instructions outside
> + * of the critical section where a critical section can either branch to or
> + * reach through the normal course of its execution. The abort IP and the
> + * post-commit IP are already part of the __rseq_cs section and should not be
> + * explicitly defined as additional exit points. Knowing all exit points is
> + * useful to assist debuggers stepping over the critical section.
> + */
> +#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
> + ".pushsection __rseq_exit_point_array, \"aw\"\n\t" \
> + LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
> + LONG " " U32_U64_PAD(__rseq_str(exit_ip)) "\n\t" \
> + ".popsection\n\t"
> +
> +#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
> + RSEQ_INJECT_ASM(1) \
> + LONG_LA " $r4, " __rseq_str(cs_label) "\n\t" \
> + LONG_S " $r4, %[" __rseq_str(rseq_cs) "]\n\t" \
> + __rseq_str(label) ":\n\t"
> +
> +#define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \
> + RSEQ_INJECT_ASM(2) \
> + "ld.w $r4, %[" __rseq_str(current_cpu_id) "]\n\t" \
> + "bne $r4, %[" __rseq_str(cpu_id) "], " __rseq_str(label) "\n\t"
> +
> +#define __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \
> + abort_label, version, flags, \
> + start_ip, post_commit_offset, abort_ip) \
> + ".balign 32\n\t" \
> + __rseq_str(table_label) ":\n\t" \
> + ".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
> + LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
> + LONG " " U32_U64_PAD(__rseq_str(post_commit_offset)) "\n\t" \
> + LONG " " U32_U64_PAD(__rseq_str(abort_ip)) "\n\t" \
> + ".word " __rseq_str(RSEQ_SIG) "\n\t" \
> + __rseq_str(label) ":\n\t" \
> + teardown \
> + "b %l[" __rseq_str(abort_label) "]\n\t"
> +
> +#define RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, abort_label, \
> + start_ip, post_commit_ip, abort_ip) \
> + __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \
> + abort_label, 0x0, 0x0, start_ip, \
> + (post_commit_ip - start_ip), abort_ip)
> +
> +#define RSEQ_ASM_DEFINE_CMPFAIL(label, teardown, cmpfail_label) \
> + __rseq_str(label) ":\n\t" \
> + teardown \
> + "b %l[" __rseq_str(cmpfail_label) "]\n\t"
> +
> +/* Per-cpu-id indexing. */
> +#define RSEQ_TEMPLATE_CPU_ID
> +#define RSEQ_TEMPLATE_MO_RELAXED
> +#include "rseq-loongarch-bits.h"
> +#undef RSEQ_TEMPLATE_MO_RELAXED
> +
> +#define RSEQ_TEMPLATE_MO_RELEASE
> +#include "rseq-loongarch-bits.h"
> +#undef RSEQ_TEMPLATE_MO_RELEASE
> +#undef RSEQ_TEMPLATE_CPU_ID
> +
> +/* Per-mm-cid indexing. */
> +
> +#define RSEQ_TEMPLATE_MM_CID
> +#define RSEQ_TEMPLATE_MO_RELAXED
> +#include "rseq-loongarch-bits.h"
> +#undef RSEQ_TEMPLATE_MO_RELAXED
> +
> +#define RSEQ_TEMPLATE_MO_RELEASE
> +#include "rseq-loongarch-bits.h"
> +#undef RSEQ_TEMPLATE_MO_RELEASE
> +#undef RSEQ_TEMPLATE_MM_CID
> +
> +/* APIs which are not based on cpu ids. */
> +
> +#define RSEQ_TEMPLATE_CPU_ID_NONE
> +#define RSEQ_TEMPLATE_MO_RELAXED
> +#include "rseq-loongarch-bits.h"
> +#undef RSEQ_TEMPLATE_MO_RELAXED
> +#undef RSEQ_TEMPLATE_CPU_ID_NONE
> diff --git a/tools/testing/selftests/rseq/rseq-thread-pointer.h b/tools/testing/selftests/rseq/rseq-thread-pointer.h
> index 977c25d758b2..b9c8fe7c4683 100644
> --- a/tools/testing/selftests/rseq/rseq-thread-pointer.h
> +++ b/tools/testing/selftests/rseq/rseq-thread-pointer.h
> @@ -12,6 +12,8 @@
> #include "rseq-x86-thread-pointer.h"
> #elif defined(__PPC__)
> #include "rseq-ppc-thread-pointer.h"
> +#elif defined(__loongarch__)
> +#include "rseq-loongarch-thread-pointer.h"
> #else
> #include "rseq-generic-thread-pointer.h"
> #endif
> diff --git a/tools/testing/selftests/rseq/rseq.h b/tools/testing/selftests/rseq/rseq.h
> index d7364ea4d201..75c4bbe013d3 100644
> --- a/tools/testing/selftests/rseq/rseq.h
> +++ b/tools/testing/selftests/rseq/rseq.h
> @@ -128,6 +128,8 @@ static inline struct rseq_abi *rseq_get_abi(void)
> #include <rseq-s390.h>
> #elif defined(__riscv)
> #include <rseq-riscv.h>
> +#elif defined(__loongarch__)
> +#include <rseq-loongarch.h>
> #else
> #error unsupported target
> #endif
> --
> 2.20.1
>
>

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