/*
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* Copyright (c) 2018 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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/*
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* Fetch indirect syscall arguments that are provided as an array.
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* Return a pointer to a static array of kernel_ulong_t elements,
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* or NULL in case of fetch failure.
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*/
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kernel_ulong_t *
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fetch_indirect_syscall_args(struct tcb *const tcp,
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const kernel_ulong_t addr,
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const unsigned int n_args)
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{
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static kernel_ulong_t u_arg[MAX_ARGS];
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if (current_wordsize == sizeof(*u_arg)) {
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if (umoven(tcp, addr, sizeof(*u_arg) * n_args, u_arg))
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return NULL;
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} else {
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uint32_t narrow_arg[ARRAY_SIZE(u_arg)];
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if (umoven(tcp, addr, sizeof(*narrow_arg) * n_args, narrow_arg))
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return NULL;
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for (unsigned int i = 0; i < n_args; ++i)
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u_arg[i] = narrow_arg[i];
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}
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return u_arg;
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}
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