diff options
| -rw-r--r-- | ChangeLog | 2 | ||||
| -rw-r--r-- | elf/dl-load.c | 41 |
2 files changed, 24 insertions, 19 deletions
@@ -1,5 +1,7 @@ 2001-03-20 Ulrich Drepper <drepper@redhat.com> + * elf/dl-load.c: Various little optimizations. + * sysdeps/unix/sysv/linux/pathconf.c (__pathconf): Return LINUX_LINK_MAX only if the statfs function is not implemented for the filesystem. diff --git a/elf/dl-load.c b/elf/dl-load.c index 6f56f97..098da6c 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -306,7 +306,7 @@ expand_dynamic_string_token (struct link_map *l, const char *s) cnt = DL_DST_COUNT (s, 1); /* If we do not have to replace anything simply copy the string. */ - if (cnt == 0) + if (__builtin_expect (cnt, 0) == 0) return local_strdup (s); /* Determine the length of the substituted string. */ @@ -905,8 +905,8 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp, if (ph->p_flags & PF_X) c->prot |= PROT_EXEC; } - break; } + break; } /* Now process the load commands and map segments into memory. */ @@ -953,7 +953,7 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp, { /* This object is loaded at a fixed address. This must never happen for objects loaded with dlopen(). */ - if (mode & __RTLD_DLOPEN) + if (__builtin_expect (mode & __RTLD_DLOPEN, 0)) { LOSE (0, N_("cannot dynamically load executable")); } @@ -1007,7 +1007,7 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp, _dl_pagesize, c->prot|PROT_WRITE) < 0) LOSE (errno, N_("cannot change memory protections")); } - memset ((void *) zero, 0, zeropage - zero); + memset ((void *) zero, '\0', zeropage - zero); if ((c->prot & PROT_WRITE) == 0) __mprotect ((caddr_t) (zero & ~(_dl_pagesize - 1)), _dl_pagesize, c->prot); @@ -1030,7 +1030,7 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp, if (l->l_phdr == NULL) { - /* The program header is not contained in any of the segmenst. + /* The program header is not contained in any of the segments. We have to allocate memory ourself and copy it over from out temporary place. */ ElfW(Phdr) *newp = (ElfW(Phdr) *) malloc (header->e_phnum @@ -1138,7 +1138,7 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp, } /* Remember whether this object must be initialized first. */ - if (l->l_flags_1 & DF_1_INITFIRST) + if (__builtin_expect (l->l_flags_1 & DF_1_INITFIRST, 0)) _dl_initfirst = l; /* Finally the file information. */ @@ -1220,7 +1220,7 @@ open_verify (const char *name, struct filebuf *fbp) }; static const struct { ElfW(Word) vendorlen, datalen, type; - char vendor [4]; + char vendor[4]; } expected_note = { 4, 16, 1, "GNU" }; int fd; @@ -1339,10 +1339,10 @@ open_verify (const char *name, struct filebuf *fbp) if (memcmp (abi_note, &expected_note, sizeof (expected_note))) continue; - osversion = (abi_note [5] & 0xff) * 65536 - + (abi_note [6] & 0xff) * 256 - + (abi_note [7] & 0xff); - if (abi_note [4] != __ABI_TAG_OS + osversion = (abi_note[5] & 0xff) * 65536 + + (abi_note[6] & 0xff) * 256 + + (abi_note[7] & 0xff); + if (abi_note[4] != __ABI_TAG_OS || (_dl_osversion && _dl_osversion < osversion)) { close_and_out: @@ -1384,6 +1384,7 @@ open_path (const char *name, size_t namelen, int preloaded, size_t cnt; char *edp; int here_any = 0; + int err; /* If we are debugging the search for libraries print the path now if it hasn't happened now. */ @@ -1436,7 +1437,8 @@ open_path (const char *name, size_t namelen, int preloaded, /* Remember whether we found any existing directory. */ here_any |= this_dir->status[cnt] == existing; - if (fd != -1 && preloaded && __libc_enable_secure) + if (fd != -1 && __builtin_expect (preloaded, 0) + && __libc_enable_secure) { /* This is an extra security effort to make sure nobody can preload broken shared objects which are in the trusted @@ -1474,7 +1476,7 @@ open_path (const char *name, size_t namelen, int preloaded, return -1; } } - if (here_any && errno != ENOENT && errno != EACCES) + if (here_any && (err = errno) != ENOENT && err != EACCES) /* The file exists and is readable, but something went wrong. */ return -1; @@ -1484,7 +1486,7 @@ open_path (const char *name, size_t namelen, int preloaded, while (*++dirs != NULL); /* Remove the whole path if none of the directories exists. */ - if (! any) + if (__builtin_expect (! any, 0)) { /* Paths which were allocated using the minimal malloc() in ld.so must not be freed using the general free() in libc. */ @@ -1515,7 +1517,7 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded, /* If the requested name matches the soname of a loaded object, use that object. Elide this check for names that have not yet been opened. */ - if (l->l_faked != 0) + if (__builtin_expect (l->l_faked, 0) != 0) continue; if (!_dl_name_match_p (name, l)) { @@ -1626,7 +1628,8 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded, &loader->l_runpath_dirs, &realname, &fb); } - if (fd == -1 && (! preloaded || ! __libc_enable_secure)) + if (fd == -1 + && (__builtin_expect (! preloaded, 1) || ! __libc_enable_secure)) { /* Check the list of libraries in the file /etc/ld.so.cache, for compatibility with Linux's ldconfig program. */ @@ -1665,7 +1668,7 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded, if (cached) { fd = open_verify (cached, &fb); - if (fd != -1) + if (__builtin_expect (fd, 0) != -1) { realname = local_strdup (cached); if (realname == NULL) @@ -1701,12 +1704,12 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded, else { fd = open_verify (realname, &fb); - if (fd == -1) + if (__builtin_expect (fd, 0) == -1) free (realname); } } - if (fd == -1) + if (__builtin_expect (fd, 0) == -1) { if (trace_mode) { |