Re: [PATCH v1 12/22] plugins: stxp test case from Aaron (!upstream)

["Alex Bennée" <alex.bennee@linaro.org>]

Aaron Lindsay <aaron@os.amperecomputing.com> writes:

> On Jan 24 20:15, Alex Bennée wrote:
>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>> Cc: Aaron Lindsay <aaron@os.amperecomputing.com>
>> Message-ID: <YXCA62xdRDeueQR6@strawberry.localdomain>
>> 
>> ---
>> [AJB] this was for testing, I think you can show the same stuff with
>> the much more complete execlog now.
>
> Is it true that execlog can also reproduce the duplicate loads which are
> still an outstanding issue?

Are we still seeing duplicate loads? I thought that had been fixed.

>
> -Aaron
>
>> ---
>>  contrib/plugins/stxp-plugin.c     | 50 +++++++++++++++++++++++++++++++
>>  tests/tcg/aarch64/stxp.c          | 28 +++++++++++++++++
>>  contrib/plugins/Makefile          |  1 +
>>  tests/tcg/aarch64/Makefile.target |  3 ++
>>  4 files changed, 82 insertions(+)
>>  create mode 100644 contrib/plugins/stxp-plugin.c
>>  create mode 100644 tests/tcg/aarch64/stxp.c
>> 
>> diff --git a/contrib/plugins/stxp-plugin.c b/contrib/plugins/stxp-plugin.c
>> new file mode 100644
>> index 0000000000..432cf8c1ed
>> --- /dev/null
>> +++ b/contrib/plugins/stxp-plugin.c
>> @@ -0,0 +1,50 @@
>> +#include <stdio.h>
>> +#include <stdarg.h>
>> +#include <qemu-plugin.h>
>> +
>> +QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
>> +
>> +void qemu_logf(const char *str, ...)
>> +{
>> +    char message[1024];
>> +    va_list args;
>> +    va_start(args, str);
>> +    vsnprintf(message, 1023, str, args);
>> +
>> +    qemu_plugin_outs(message);
>> +
>> +    va_end(args);
>> +}
>> +
>> +void before_insn_cb(unsigned int cpu_index, void *udata)
>> +{
>> +    uint64_t pc = (uint64_t)udata;
>> +    qemu_logf("Executing PC: 0x%" PRIx64 "\n", pc);
>> +}
>> +
>> +static void mem_cb(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo, uint64_t va, void *udata)
>> +{
>> +    uint64_t pc = (uint64_t)udata;
>> +    qemu_logf("PC 0x%" PRIx64 " accessed memory at 0x%" PRIx64 "\n", pc, va);
>> +}
>> +
>> +static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
>> +{
>> +    size_t n = qemu_plugin_tb_n_insns(tb);
>> +
>> +    for (size_t i = 0; i < n; i++) {
>> +        struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
>> +        uint64_t pc = qemu_plugin_insn_vaddr(insn);
>> +
>> +        qemu_plugin_register_vcpu_insn_exec_cb(insn, before_insn_cb, QEMU_PLUGIN_CB_R_REGS, (void *)pc);
>> +        qemu_plugin_register_vcpu_mem_cb(insn, mem_cb, QEMU_PLUGIN_CB_NO_REGS, QEMU_PLUGIN_MEM_RW, (void*)pc);
>> +    }
>> +}
>> +
>> +QEMU_PLUGIN_EXPORT
>> +int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
>> +                        int argc, char **argv)
>> +{
>> +    qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
>> +    return 0;
>> +}
>> diff --git a/tests/tcg/aarch64/stxp.c b/tests/tcg/aarch64/stxp.c
>> new file mode 100644
>> index 0000000000..fb8ef6a46d
>> --- /dev/null
>> +++ b/tests/tcg/aarch64/stxp.c
>> @@ -0,0 +1,28 @@
>> +
>> +
>> +void stxp_issue_demo(void *arr)
>> +{
>> +    asm(".align 8\n\t"
>> +        "    mov x0, %[in]\n\t"
>> +        "    mov x18, 0x1000\n\t"
>> +        "    mov x2, 0x0\n\t"
>> +        "    mov x3, 0x0\n\t"
>> +        "loop:\n\t"
>> +        "    prfm  pstl1strm, [x0]\n\t"
>> +        "    ldxp  x16, x17, [x0]\n\t"
>> +        "    stxp  w16, x2, x3, [x0]\n\t"
>> +        "\n\t"
>> +        "    subs x18, x18, 1\n\t"
>> +        "    beq done\n\t"
>> +        "    b loop\n\t"
>> +        "done:\n\t"
>> +        : /* none out */
>> +        : [in] "r" (arr) /* in */
>> +        : "x0", "x2", "x3", "x16", "x17", "x18"); /* clobbers */
>> +}
>> +
>> +int main()
>> +{
>> +    char arr[16];
>> +    stxp_issue_demo(&arr);
>> +}
>> diff --git a/contrib/plugins/Makefile b/contrib/plugins/Makefile
>> index 54ac5ccd9f..576ed5875a 100644
>> --- a/contrib/plugins/Makefile
>> +++ b/contrib/plugins/Makefile
>> @@ -20,6 +20,7 @@ NAMES += howvec
>>  NAMES += lockstep
>>  NAMES += hwprofile
>>  NAMES += cache
>> +NAMES += stxp-plugin
>>  
>>  SONAMES := $(addsuffix .so,$(addprefix lib,$(NAMES)))
>>  
>> diff --git a/tests/tcg/aarch64/Makefile.target b/tests/tcg/aarch64/Makefile.target
>> index 1d967901bd..54b2e90d00 100644
>> --- a/tests/tcg/aarch64/Makefile.target
>> +++ b/tests/tcg/aarch64/Makefile.target
>> @@ -72,4 +72,7 @@ endif
>>  
>>  endif
>>  
>> +# Load/Store exclusive test
>> +AARCH64_TESTS += stxp
>> +
>>  TESTS += $(AARCH64_TESTS)
>> -- 
>> 2.30.2
>> 


-- 
Alex Bennée