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110 lines
3.4 KiB
110 lines
3.4 KiB
/* Test program for getting symbol table from vdso module. |
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Copyright (C) 2014 Red Hat, Inc. |
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This file is part of elfutils. |
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This file is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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elfutils is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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#include <config.h> |
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#include <assert.h> |
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#include <errno.h> |
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#include <inttypes.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <sys/types.h> |
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#include <unistd.h> |
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#include ELFUTILS_HEADER(dwfl) |
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#include "system.h" |
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#ifndef __linux__ |
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int |
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main (int argc __attribute__ ((unused)), char **argv __attribute__ ((unused))) |
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{ |
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printf ("Getting the vdso is unsupported.\n"); |
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return 77; |
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} |
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#else /* __linux__ */ |
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static int vdso_syms = 0; |
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static int |
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module_callback (Dwfl_Module *mod, void **userdata __attribute__((unused)), |
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const char *name, Dwarf_Addr start __attribute__((unused)), |
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void *arg __attribute__((unused))) |
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{ |
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/* We can only recognize the vdso by inspecting the "magic name". */ |
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printf ("module name: %s\n", name); |
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if (strncmp ("[vdso: ", name, 7) == 0) |
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{ |
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vdso_syms = dwfl_module_getsymtab (mod); |
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printf ("vdso syms: %d\n", vdso_syms); |
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if (vdso_syms < 0) |
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error (2, 0, "dwfl_module_getsymtab: %s", dwfl_errmsg (-1)); |
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for (int i = 0; i < vdso_syms; i++) |
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{ |
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GElf_Sym sym; |
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GElf_Addr addr; |
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const char *sname = dwfl_module_getsym_info (mod, i, &sym, &addr, |
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NULL, NULL, NULL); |
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assert (sname != NULL); |
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printf ("%d: '%s' %" PRIx64 " (%" PRIx64 ")\n", |
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i, sname, sym.st_value, addr); |
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} |
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} |
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return DWARF_CB_OK; |
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} |
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int |
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main (int argc __attribute__ ((unused)), char **argv __attribute__ ((unused))) |
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{ |
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static char *debuginfo_path; |
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static const Dwfl_Callbacks proc_callbacks = |
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{ |
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.find_debuginfo = dwfl_standard_find_debuginfo, |
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.debuginfo_path = &debuginfo_path, |
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.find_elf = dwfl_linux_proc_find_elf, |
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}; |
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Dwfl *dwfl = dwfl_begin (&proc_callbacks); |
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if (dwfl == NULL) |
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error (2, 0, "dwfl_begin: %s", dwfl_errmsg (-1)); |
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/* Take ourself as "arbitrary" process to inspect. This should work |
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even with "restricted ptrace". */ |
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pid_t pid = getpid(); |
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int result = dwfl_linux_proc_report (dwfl, pid); |
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if (result < 0) |
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error (2, 0, "dwfl_linux_proc_report: %s", dwfl_errmsg (-1)); |
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else if (result > 0) |
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error (2, result, "dwfl_linux_proc_report"); |
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/* Also explicitly attach for older kernels (cannot read vdso otherwise). */ |
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result = dwfl_linux_proc_attach (dwfl, pid, false); |
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if (result < 0) |
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error (2, 0, "dwfl_linux_proc_attach: %s", dwfl_errmsg (-1)); |
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else if (result > 0) |
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error (2, result, "dwfl_linux_proc_attach"); |
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if (dwfl_report_end (dwfl, NULL, NULL) != 0) |
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error (2, 0, "dwfl_report_end: %s", dwfl_errmsg (-1)); |
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if (dwfl_getmodules (dwfl, module_callback, NULL, 0) != 0) |
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error (1, 0, "dwfl_getmodules: %s", dwfl_errmsg (-1)); |
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/* No symbols is ok, then we haven't seen the vdso at all on this arch. */ |
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return vdso_syms >= 0 ? 0 : -1; |
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} |
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#endif /* ! __linux__ */
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