perf_regs.c

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// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include "perf_regs.h"
#include "event.h"

const struct sample_reg __weak sample_reg_masks[] = {
    SMPL_REG_END
};

int __weak arch_sdt_arg_parse_op(char *old_op __maybe_unused,
                 char **new_op __maybe_unused)
{
    return SDT_ARG_SKIP;
}

#ifdef HAVE_PERF_REGS_SUPPORT
int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
{
    int i, idx = 0;
    u64 mask = regs->mask;

    if (regs->cache_mask & (1ULL << id))
        goto out;

    if (!(mask & (1ULL << id)))
        return -EINVAL;

    for (i = 0; i < id; i++) {
        if (mask & (1ULL << i))
            idx++;
    }

    regs->cache_mask |= (1ULL << id);
    regs->cache_regs[id] = regs->regs[idx];

out:
    *valp = regs->cache_regs[id];
    return 0;
}
#endif