diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c | 154 |
1 files changed, 23 insertions, 131 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c b/sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c index 7280315933..7a2b0c8279 100644 --- a/sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c +++ b/sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c @@ -17,135 +17,27 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ -#include <elf.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <sys/mman.h> -#include <fcntl.h> -#include <link.h> -#include <unistd.h> - -extern int _dl_argc; -extern char **_dl_argv; -extern char **_environ; -extern size_t _dl_pagesize; -extern void _end; -extern void _start (void); - -int __libc_enable_secure; -int __libc_multiple_libcs; /* Defining this here avoids the inclusion - of init-first. */ - -ElfW(Addr) -_dl_sysdep_start (void **start_argptr, - void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum, - ElfW(Addr) *user_entry)) -{ - const ElfW(Phdr) *phdr = NULL; - ElfW(Word) phnum = 0; - ElfW(Addr) user_entry; - ElfW(auxv_t) *av; - uid_t uid = 0; - uid_t euid = 0; - gid_t gid = 0; - gid_t egid = 0; - unsigned int seen; - - user_entry = (ElfW(Addr)) &_start; - _dl_argc = *(long *) start_argptr; - _dl_argv = (char **) start_argptr + 1; - _environ = &_dl_argv[_dl_argc + 1]; - start_argptr = (void **) _environ; - while (*start_argptr) - ++start_argptr; - ++start_argptr; - - if (*start_argptr == 0 && - ((unsigned)(char *)start_argptr & 0xF) != 0) - { - unsigned test_sap = (int)(char *)start_argptr; - test_sap = test_sap + 0xF & ~0xF; - if (*(long *)(char *)test_sap == AT_PHDR) - start_argptr = (void **)(char *)test_sap; - } - - seen = 0; -#define M(type) (1 << (type)) - - for (av = (void *) start_argptr; - av->a_type != AT_NULL; - seen |= M ((++av)->a_type)) - switch (av->a_type) - { - case AT_PHDR: - phdr = av->a_un.a_ptr; - break; - case AT_PHNUM: - phnum = av->a_un.a_val; - break; - case AT_PAGESZ: - _dl_pagesize = av->a_un.a_val; - break; - case AT_ENTRY: - user_entry = av->a_un.a_val; - break; - case AT_UID: - uid = av->a_un.a_val; - break; - case AT_GID: - gid = av->a_un.a_val; - break; - case AT_EUID: - euid = av->a_un.a_val; - break; - case AT_EGID: - egid = av->a_un.a_val; - break; - } - - /* Linux doesn't provide us with any of these values on the stack - when the dynamic linker is run directly as a program. */ - -#define SEE(UID, uid) if ((seen & M (AT_##UID)) == 0) uid = __get##uid () - SEE (UID, uid); - SEE (GID, gid); - SEE (EUID, euid); - SEE (EGID, egid); - - - __libc_enable_secure = uid != euid || gid != egid; - - __brk (0); /* Initialize the break. */ - - if (__sbrk (0) == &_end) - { - /* The dynamic linker was run as a program, and so the initial break - starts just after our bss, at &_end. The malloc in dl-minimal.c - will consume the rest of this page, so tell the kernel to move the - break up that far. When the user program examines its break, it - will see this new value and not clobber our data. */ - size_t pg = __getpagesize (); - - __sbrk (pg - ((&_end - (void *) 0) & pg)); - __sbrk (pg - ((&_end - (void *) 0) & (pg - 1))); - } - - (*dl_main) (phdr, phnum, &user_entry); - return user_entry; -} - -void -_dl_sysdep_start_cleanup (void) -{ -} - -#ifndef MAP_ANON -/* This is only needed if the system doesn't support MAP_ANON. */ - -int -_dl_sysdep_open_zero_fill (void) -{ - return __open ("/dev/zero", O_RDONLY); -} -#endif +/* The PowerPC's auxiliary argument block gets aligned to a 16-byte + boundary. This is history and impossible to change compatibly. */ + +#define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \ + do { \ + void **_tmp; \ + (argc) = *(long *) cookie; \ + (argv) = (char **) cookie + 1; \ + (envp) = (argv) + (argc) + 1; \ + for (_tmp = (void **) (envp); *_tmp; ++_tmp) \ + continue; \ + if (*_tmp == 0 && ((size_t)_tmp & 0xf) != 0) \ + { \ + size_t _test = (size_t)_tmp; \ + _test = _test + 0xf & ~0xf; \ + if (*(long *)_test == AT_PHDR) \ + _tmp = (void **)_test; \ + } \ + (auxp) = (void *) _tmp; \ + } while (0) + + +#include <sysdeps/unix/sysv/linux/dl-sysdep.c> |