Dmitry V. Levin
b93d52fe3d
strace is now provided under the terms of the GNU Lesser General Public License version 2.1 or later, see COPYING for more details. strace test suite is now provided under the terms of the GNU General Public License version 2 or later, see tests/COPYING for more details.
36 lines
847 B
C
36 lines
847 B
C
/*
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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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* SPDX-License-Identifier: LGPL-2.1-or-later
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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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