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Diffstat (limited to 'sysdeps/tile/dl-runtime.c')
| -rw-r--r-- | sysdeps/tile/dl-runtime.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/sysdeps/tile/dl-runtime.c b/sysdeps/tile/dl-runtime.c new file mode 100644 index 0000000000..3bfb830320 --- /dev/null +++ b/sysdeps/tile/dl-runtime.c @@ -0,0 +1,158 @@ +/* Copyright (C) 2011-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Chris Metcalf <cmetcalf@tilera.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/>. */ + +/* Like x86_64, we pass the index of the relocation and not its offset. + In _dl_profile_fixup and _dl_call_pltexit we also use the index. + Therefore it is wasteful to compute the offset in the trampoline + just to reverse the operation immediately afterwards. */ +#define reloc_offset reloc_arg * sizeof (PLTREL) +#define reloc_index reloc_arg + +#include <elf/dl-runtime.c> + +#include <sys/mman.h> +#include <arch/sim.h> + +/* Like realpath(), but simplified: no dynamic memory use, no lstat(), + no set_errno(), no valid "rpath" on error, etc. This handles some + simple cases where the simulator might not have a valid entry for + a loaded Elf object, in particular dlopen() with a relative path. + For this relatively rare case, one could also imagine using + link_map.l_origin to avoid the getcwd() here, but the simpler code + here seems like a better solution. */ +static char * +dl_realpath (const char *name, char *rpath) +{ + char *dest; + const char *start, *end; + + if (name[0] != '/') + { + if (!__getcwd (rpath, PATH_MAX)) + return NULL; + dest = __rawmemchr (rpath, '\0'); + } + else + { + rpath[0] = '/'; + dest = rpath + 1; + } + + for (start = end = name; *start; start = end) + { + /* Skip sequence of multiple path-separators. */ + while (*start == '/') + ++start; + + /* Find end of path component. */ + for (end = start; *end && *end != '/'; ++end) + /* Nothing. */; + + if (end - start == 0) + break; + else if (end - start == 1 && start[0] == '.') + /* nothing */; + else if (end - start == 2 && start[0] == '.' && start[1] == '.') + { + /* Back up to previous component, ignore if at root already. */ + if (dest > rpath + 1) + while ((--dest)[-1] != '/'); + } + else + { + if (dest[-1] != '/') + *dest++ = '/'; + + if (dest + (end - start) >= rpath + PATH_MAX) + return NULL; + + dest = __mempcpy (dest, start, end - start); + *dest = '\0'; + } + } + if (dest > rpath + 1 && dest[-1] == '/') + --dest; + *dest = '\0'; + + return rpath; +} + +/* Support notifying the simulator about new objects. */ +void internal_function +_dl_after_load (struct link_map *l) +{ + int shift; + char pathbuf[PATH_MAX]; + char *path; + + /* Don't bother if not in the simulator. */ + if (__insn_mfspr (SPR_SIM_CONTROL) == 0) + return; + +#define DLPUTC(c) __insn_mtspr (SPR_SIM_CONTROL, \ + (SIM_CONTROL_DLOPEN \ + | ((c) << _SIM_CONTROL_OPERATOR_BITS))) + + /* Write the library address in hex. */ + DLPUTC ('0'); + DLPUTC ('x'); + for (shift = (int) sizeof (unsigned long) * 8 - 4; shift >= 0; shift -= 4) + DLPUTC ("0123456789abcdef"[(l->l_map_start >> shift) & 0xF]); + DLPUTC (':'); + + /* Write the library path, including the terminating '\0'. */ + path = dl_realpath (l->l_name, pathbuf) ?: l->l_name; + for (size_t i = 0;; i++) + { + DLPUTC (path[i]); + if (path[i] == '\0') + break; + } +#undef DLPUTC +} + +/* Support notifying the simulator about removed objects prior to munmap(). */ +static void +sim_dlclose (ElfW(Addr) map_start) +{ + int shift; + + /* Don't bother if not in the simulator. */ + if (__insn_mfspr (SPR_SIM_CONTROL) == 0) + return; + +#define DLPUTC(c) __insn_mtspr (SPR_SIM_CONTROL, \ + (SIM_CONTROL_DLCLOSE \ + | ((c) << _SIM_CONTROL_OPERATOR_BITS))) + + /* Write the library address in hex. */ + DLPUTC ('0'); + DLPUTC ('x'); + for (shift = (int) sizeof (unsigned long) * 8 - 4; shift >= 0; shift -= 4) + DLPUTC ("0123456789abcdef"[(map_start >> shift) & 0xF]); + DLPUTC ('\0'); + +#undef DLPUTC +} + +void internal_function +_dl_unmap (struct link_map *l) +{ + sim_dlclose (l->l_map_start); + __munmap ((void *) l->l_map_start, l->l_map_end - l->l_map_start); +} |