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3b2b7938f7
At least on IA64 and PowerPC 64-bit ELFv1, the functions are stored in the .text sections but they are accessed through a function descriptor stored in a data section, for example for PowerPC 64-bit ELFv1 that section is called .opd. We should take this into account when checking the n_type for the functions we have requested information from nlist(). Rationale-by: James Clarke <jrtc27@jrtc27.com>
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/*
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* Copyright © 2017 Guillem Jover <guillem@hadrons.org>
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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 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <nlist.h>
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static int data_prv_init = 50;
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extern int data_pub_init;
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extern int data_pub_uninit[2048];
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extern int *data_pub_ptr;
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int *data_pub_ptr = &data_prv_init;
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int data_pub_init = 10;
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int data_pub_uninit[2048];
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extern int
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func_pub(void);
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int
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func_pub(void)
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{
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return 42;
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}
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int
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main(int argc, char **argv)
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{
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struct nlist nl[] = {
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{ .n_un.n_name = "main" },
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{ .n_un.n_name = "func_pub" },
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{ .n_un.n_name = "data_pub_uninit" },
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{ .n_un.n_name = "data_pub_init" },
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{ .n_un.n_name = "data_prv_init" },
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{ .n_un.n_name = NULL },
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};
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int rc;
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assert(*data_pub_ptr == 50);
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rc = nlist(argv[0], nl);
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assert(rc == 0);
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#if defined(__ia64__) || (defined(__powerpc64__) && _CALL_ELF == 1)
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/* On IA64 and PowerPC 64-bit ELFv1, the functions are stored in
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* the .text sections but they are accessed through a function
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* descriptor stored in a data section, for example for PowerPC
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* 64-bit that section is called .opd. */
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assert(nl[0].n_type == (N_DATA | N_EXT));
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assert(nl[1].n_type == (N_DATA | N_EXT));
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#else
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assert(nl[0].n_type == (N_TEXT | N_EXT));
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assert(nl[1].n_type == (N_TEXT | N_EXT));
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#endif
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assert(nl[2].n_type == (N_BSS | N_EXT));
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assert(nl[3].n_type == (N_DATA | N_EXT));
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assert(nl[4].n_type == (N_DATA));
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return 0;
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}
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