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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2021, 2024, Oracle and/or its affiliates.
*/
#include <linux/bpf.h>
#include <stdint.h>
#include <bpf/bpf_helpers.h>
#include <dt_dctx.h>
#ifndef noinline
# define noinline __attribute__((noinline))
#endif
extern int64_t dt_error(const dt_dctx_t *dctx);
/*
* DTrace ERROR probes provide 6 arguments:
* arg0 = always NULL (used to be kernel consumer state pointer)
* arg1 = probe ID that triggered the fault
* arg2 = statement ID that triggered the fault
* arg3 = BPF offset in the clause that triggered the fault (or -1)
* arg4 = fault type
* arg5 = fault-specific value (usually address being accessed or 0)
*/
noinline void dt_probe_error(const dt_dctx_t *dctx, uint64_t pc, uint64_t fault,
uint64_t illval)
{
dt_mstate_t *mst = dctx->mst;
int oldprid = mst->prid;
__builtin_memcpy(mst->saved_argv, mst->argv, sizeof(mst->saved_argv));
mst->argv[0] = 0;
mst->argv[1] = mst->prid;
mst->argv[2] = mst->stid;
mst->argv[3] = pc;
mst->argv[4] = fault;
mst->argv[5] = illval;
mst->prid = DTRACE_ERROR_ID;
dt_error(dctx);
mst->prid = oldprid;
__builtin_memcpy(mst->argv, mst->saved_argv, sizeof(mst->saved_argv));
mst->fault = fault;
}
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