| /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #define E(name) E_(name, CLASS) |
| #define E_(name, cl) E__(name, cl) |
| #define E__(name, cl) name##cl |
| #define EW(type) EW_(Elf, CLASS, type) |
| #define EW_(e, w, t) EW__(e, w, _##t) |
| #define EW__(e, w, t) e##w##t |
| |
| #define pldd_assert(name, exp) \ |
| typedef int __assert_##name[((exp) != 0) - 1] |
| |
| |
| struct E(link_map) |
| { |
| EW(Addr) l_addr; |
| EW(Addr) l_name; |
| EW(Addr) l_ld; |
| EW(Addr) l_next; |
| EW(Addr) l_prev; |
| EW(Addr) l_real; |
| Lmid_t l_ns; |
| EW(Addr) l_libname; |
| }; |
| #if CLASS == __ELF_NATIVE_CLASS |
| pldd_assert (l_addr, (offsetof (struct link_map, l_addr) |
| == offsetof (struct E(link_map), l_addr))); |
| pldd_assert (l_name, (offsetof (struct link_map, l_name) |
| == offsetof (struct E(link_map), l_name))); |
| pldd_assert (l_next, (offsetof (struct link_map, l_next) |
| == offsetof (struct E(link_map), l_next))); |
| #endif |
| |
| |
| struct E(libname_list) |
| { |
| EW(Addr) name; |
| EW(Addr) next; |
| }; |
| #if CLASS == __ELF_NATIVE_CLASS |
| pldd_assert (name, (offsetof (struct libname_list, name) |
| == offsetof (struct E(libname_list), name))); |
| pldd_assert (next, (offsetof (struct libname_list, next) |
| == offsetof (struct E(libname_list), next))); |
| #endif |
| |
| struct E(r_debug) |
| { |
| int r_version; |
| #if CLASS == 64 |
| int pad; |
| #endif |
| EW(Addr) r_map; |
| }; |
| #if CLASS == __ELF_NATIVE_CLASS |
| pldd_assert (r_version, (offsetof (struct r_debug, r_version) |
| == offsetof (struct E(r_debug), r_version))); |
| pldd_assert (r_map, (offsetof (struct r_debug, r_map) |
| == offsetof (struct E(r_debug), r_map))); |
| #endif |
| |
| |
| static int |
| |
| E(find_maps) (pid_t pid, void *auxv, size_t auxv_size) |
| { |
| EW(Addr) phdr = 0; |
| unsigned int phnum = 0; |
| unsigned int phent = 0; |
| |
| EW(auxv_t) *auxvXX = (EW(auxv_t) *) auxv; |
| for (int i = 0; i < auxv_size / sizeof (EW(auxv_t)); ++i) |
| switch (auxvXX[i].a_type) |
| { |
| case AT_PHDR: |
| phdr = auxvXX[i].a_un.a_val; |
| break; |
| case AT_PHNUM: |
| phnum = auxvXX[i].a_un.a_val; |
| break; |
| case AT_PHENT: |
| phent = auxvXX[i].a_un.a_val; |
| break; |
| default: |
| break; |
| } |
| |
| if (phdr == 0 || phnum == 0 || phent == 0) |
| error (EXIT_FAILURE, 0, gettext ("cannot find program header of process")); |
| |
| EW(Phdr) *p = alloca (phnum * phent); |
| if (pread64 (memfd, p, phnum * phent, phdr) != phnum * phent) |
| { |
| error (0, 0, gettext ("cannot read program header")); |
| return EXIT_FAILURE; |
| } |
| |
| /* Determine the load offset. We need this for interpreting the |
| other program header entries so we do this in a separate loop. |
| Fortunately it is the first time unless someone does something |
| stupid when linking the application. */ |
| EW(Addr) offset = 0; |
| for (unsigned int i = 0; i < phnum; ++i) |
| if (p[i].p_type == PT_PHDR) |
| { |
| offset = phdr - p[i].p_vaddr; |
| break; |
| } |
| |
| EW(Addr) list = 0; |
| char *interp = NULL; |
| for (unsigned int i = 0; i < phnum; ++i) |
| if (p[i].p_type == PT_DYNAMIC) |
| { |
| EW(Dyn) *dyn = xmalloc (p[i].p_filesz); |
| if (pread64 (memfd, dyn, p[i].p_filesz, offset + p[i].p_vaddr) |
| != p[i].p_filesz) |
| { |
| error (0, 0, gettext ("cannot read dynamic section")); |
| return EXIT_FAILURE; |
| } |
| |
| /* Search for the DT_DEBUG entry. */ |
| for (unsigned int j = 0; j < p[i].p_filesz / sizeof (EW(Dyn)); ++j) |
| if (dyn[j].d_tag == DT_DEBUG && dyn[j].d_un.d_ptr != 0) |
| { |
| struct E(r_debug) r; |
| if (pread64 (memfd, &r, sizeof (r), dyn[j].d_un.d_ptr) |
| != sizeof (r)) |
| { |
| error (0, 0, gettext ("cannot read r_debug")); |
| return EXIT_FAILURE; |
| } |
| |
| if (r.r_map != 0) |
| { |
| list = r.r_map; |
| break; |
| } |
| } |
| |
| free (dyn); |
| break; |
| } |
| else if (p[i].p_type == PT_INTERP) |
| { |
| interp = alloca (p[i].p_filesz); |
| if (pread64 (memfd, interp, p[i].p_filesz, offset + p[i].p_vaddr) |
| != p[i].p_filesz) |
| { |
| error (0, 0, gettext ("cannot read program interpreter")); |
| return EXIT_FAILURE; |
| } |
| } |
| |
| if (list == 0) |
| { |
| if (interp == NULL) |
| { |
| // XXX check whether the executable itself is the loader |
| return EXIT_FAILURE; |
| } |
| |
| // XXX perhaps try finding ld.so and _r_debug in it |
| |
| return EXIT_FAILURE; |
| } |
| |
| /* Print the PID and program name first. */ |
| printf ("%lu:\t%s\n", (unsigned long int) pid, exe); |
| |
| /* Iterate over the list of objects and print the information. */ |
| size_t strsize = 256; |
| char *str = alloca (strsize); |
| do |
| { |
| struct E(link_map) m; |
| if (pread64 (memfd, &m, sizeof (m), list) != sizeof (m)) |
| { |
| error (0, 0, gettext ("cannot read link map")); |
| return EXIT_FAILURE; |
| } |
| |
| EW(Addr) name_offset = m.l_name; |
| again: |
| while (1) |
| { |
| ssize_t n = pread64 (memfd, str, strsize, name_offset); |
| if (n == -1) |
| { |
| error (0, 0, gettext ("cannot read object name")); |
| return EXIT_FAILURE; |
| } |
| |
| if (memchr (str, '\0', n) != NULL) |
| break; |
| |
| str = extend_alloca (str, strsize, strsize * 2); |
| } |
| |
| if (str[0] == '\0' && name_offset == m.l_name |
| && m.l_libname != 0) |
| { |
| /* Try the l_libname element. */ |
| struct E(libname_list) ln; |
| if (pread64 (memfd, &ln, sizeof (ln), m.l_libname) == sizeof (ln)) |
| { |
| name_offset = ln.name; |
| goto again; |
| } |
| } |
| |
| /* Skip over the executable. */ |
| if (str[0] != '\0') |
| printf ("%s\n", str); |
| |
| list = m.l_next; |
| } |
| while (list != 0); |
| |
| return 0; |
| } |
| |
| |
| #undef CLASS |
