mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 15:20:10 +00:00
Update.
1999-02-19 Ulrich Drepper <drepper@cygnus.com> * elf/ldsodefs.h (_dl_signal_error): Mark as __noreturn__. * elf/dl-load.c (lose): Make it a function at the toplevel, mark as noreturn, and prevent it from being inlined. Define LOSE appropriately. (_dl_map_object_from_fd): Compare all bytes in e_ident at once. Optimize decoding of p_flags for certain platforms.
This commit is contained in:
Ulrich Drepper
parent
4ac5087baf
commit
126b06f99e
@ -1,3 +1,12 @@
|
||||
1999-02-19 Ulrich Drepper <drepper@cygnus.com>
|
||||
|
||||
* elf/ldsodefs.h (_dl_signal_error): Mark as __noreturn__.
|
||||
* elf/dl-load.c (lose): Make it a function at the toplevel, mark as
|
||||
noreturn, and prevent it from being inlined.
|
||||
Define LOSE appropriately.
|
||||
(_dl_map_object_from_fd): Compare all bytes in e_ident at once.
|
||||
Optimize decoding of p_flags for certain platforms.
|
||||
|
||||
1999-02-19 Philip Blundell <pb@nexus.co.uk>
|
||||
|
||||
* Makeconfig (link-libc): When doing a static link, make sure that
|
||||
|
||||
193
elf/dl-load.c
193
elf/dl-load.c
@ -555,6 +555,33 @@ _dl_init_paths (const char *llp)
|
||||
}
|
||||
|
||||
|
||||
#define LOSE(code, s) lose (code, fd, name, realname, l, s)
|
||||
static void volatile
|
||||
__attribute__ ((noreturn))
|
||||
lose (int code, int fd, const char *name, char *realname, struct link_map *l,
|
||||
const char *msg)
|
||||
{
|
||||
/* The use of `alloca' here looks ridiculous but it helps. The goal
|
||||
is to avoid the function from being inlined. There is no official
|
||||
way to do this so we use this trick. gcc never inlines functions
|
||||
which use `alloca'. */
|
||||
int *a = alloca (sizeof (int));
|
||||
a[0] = fd;
|
||||
(void) __close (a[0]);
|
||||
if (l != NULL)
|
||||
{
|
||||
/* Remove the stillborn object from the list and free it. */
|
||||
if (l->l_prev)
|
||||
l->l_prev->l_next = l->l_next;
|
||||
if (l->l_next)
|
||||
l->l_next->l_prev = l->l_prev;
|
||||
free (l);
|
||||
}
|
||||
free (realname);
|
||||
_dl_signal_error (code, name, msg);
|
||||
}
|
||||
|
||||
|
||||
/* Map in the shared object NAME, actually located in REALNAME, and already
|
||||
opened on FD. */
|
||||
|
||||
@ -565,25 +592,23 @@ struct link_map *
|
||||
_dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
struct link_map *loader, int l_type)
|
||||
{
|
||||
/* This is the expected ELF header. */
|
||||
#define ELF32_CLASS ELFCLASS32
|
||||
#define ELF64_CLASS ELFCLASS64
|
||||
static const unsigned char expected[EI_PAD] =
|
||||
{
|
||||
[EI_MAG0] = ELFMAG0,
|
||||
[EI_MAG1] = ELFMAG1,
|
||||
[EI_MAG2] = ELFMAG2,
|
||||
[EI_MAG3] = ELFMAG3,
|
||||
[EI_CLASS] = ELFW(CLASS),
|
||||
[EI_DATA] = byteorder,
|
||||
[EI_VERSION] = EV_CURRENT,
|
||||
[EI_OSABI] = ELFOSABI_SYSV,
|
||||
[EI_ABIVERSION] = 0
|
||||
};
|
||||
struct link_map *l = NULL;
|
||||
|
||||
#define LOSE(s) lose (0, (s))
|
||||
void lose (int code, const char *msg)
|
||||
{
|
||||
(void) __close (fd);
|
||||
if (l)
|
||||
{
|
||||
/* Remove the stillborn object from the list and free it. */
|
||||
if (l->l_prev)
|
||||
l->l_prev->l_next = l->l_next;
|
||||
if (l->l_next)
|
||||
l->l_next->l_prev = l->l_prev;
|
||||
free (l);
|
||||
}
|
||||
free (realname);
|
||||
_dl_signal_error (code, name, msg);
|
||||
}
|
||||
|
||||
inline caddr_t map_segment (ElfW(Addr) mapstart, size_t len,
|
||||
int prot, int fixed, off_t offset)
|
||||
{
|
||||
@ -591,7 +616,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
fixed|MAP_COPY|MAP_FILE,
|
||||
fd, offset);
|
||||
if (mapat == MAP_FAILED)
|
||||
lose (errno, "failed to map segment from shared object");
|
||||
LOSE (errno, "failed to map segment from shared object");
|
||||
return mapat;
|
||||
}
|
||||
|
||||
@ -605,8 +630,8 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
struct stat st;
|
||||
|
||||
/* Get file information. */
|
||||
if (__fstat (fd, &st) < 0)
|
||||
lose (errno, "cannot stat shared object");
|
||||
if (__fxstat (_STAT_VER, fd, &st) < 0)
|
||||
LOSE (errno, "cannot stat shared object");
|
||||
|
||||
/* Look again to see if the real name matched another already loaded. */
|
||||
for (l = _dl_loaded; l; l = l->l_next)
|
||||
@ -631,48 +656,52 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
/* Read the header directly. */
|
||||
readbuf = alloca (_dl_pagesize);
|
||||
readlength = __libc_read (fd, readbuf, _dl_pagesize);
|
||||
if (readlength < (ssize_t) sizeof(*header))
|
||||
lose (errno, "cannot read file data");
|
||||
if (readlength < (ssize_t) sizeof (*header))
|
||||
LOSE (errno, "cannot read file data");
|
||||
header = (void *) readbuf;
|
||||
|
||||
/* Check the header for basic validity. */
|
||||
if (*(Elf32_Word *) &header->e_ident !=
|
||||
if (memcmp (header->e_ident, expected, EI_PAD) != 0)
|
||||
{
|
||||
/* Something is wrong. */
|
||||
if (*(Elf32_Word *) &header->e_ident !=
|
||||
#if BYTE_ORDER == LITTLE_ENDIAN
|
||||
((ELFMAG0 << (EI_MAG0 * 8)) |
|
||||
(ELFMAG1 << (EI_MAG1 * 8)) |
|
||||
(ELFMAG2 << (EI_MAG2 * 8)) |
|
||||
(ELFMAG3 << (EI_MAG3 * 8)))
|
||||
((ELFMAG0 << (EI_MAG0 * 8)) |
|
||||
(ELFMAG1 << (EI_MAG1 * 8)) |
|
||||
(ELFMAG2 << (EI_MAG2 * 8)) |
|
||||
(ELFMAG3 << (EI_MAG3 * 8)))
|
||||
#else
|
||||
((ELFMAG0 << (EI_MAG3 * 8)) |
|
||||
(ELFMAG1 << (EI_MAG2 * 8)) |
|
||||
(ELFMAG2 << (EI_MAG1 * 8)) |
|
||||
(ELFMAG3 << (EI_MAG0 * 8)))
|
||||
((ELFMAG0 << (EI_MAG3 * 8)) |
|
||||
(ELFMAG1 << (EI_MAG2 * 8)) |
|
||||
(ELFMAG2 << (EI_MAG1 * 8)) |
|
||||
(ELFMAG3 << (EI_MAG0 * 8)))
|
||||
#endif
|
||||
)
|
||||
LOSE ("invalid ELF header");
|
||||
#define ELF32_CLASS ELFCLASS32
|
||||
#define ELF64_CLASS ELFCLASS64
|
||||
if (header->e_ident[EI_CLASS] != ELFW(CLASS))
|
||||
LOSE ("ELF file class not " STRING(__ELF_NATIVE_CLASS) "-bit");
|
||||
if (header->e_ident[EI_DATA] != byteorder)
|
||||
LOSE ("ELF file data encoding not " byteorder_name);
|
||||
if (header->e_ident[EI_VERSION] != EV_CURRENT)
|
||||
LOSE ("ELF file version ident not " STRING(EV_CURRENT));
|
||||
/* XXX We should be able so set system specific versions which are
|
||||
allowed here. */
|
||||
if (header->e_ident[EI_OSABI] != ELFOSABI_SYSV)
|
||||
LOSE ("ELF file OS ABI not " STRING(ELFOSABI_SYSV));
|
||||
if (header->e_ident[EI_ABIVERSION] != 0)
|
||||
LOSE ("ELF file ABI version not 0");
|
||||
)
|
||||
LOSE (0, "invalid ELF header");
|
||||
if (header->e_ident[EI_CLASS] != ELFW(CLASS))
|
||||
LOSE (0, "ELF file class not " STRING(__ELF_NATIVE_CLASS) "-bit");
|
||||
if (header->e_ident[EI_DATA] != byteorder)
|
||||
LOSE (0, "ELF file data encoding not " byteorder_name);
|
||||
if (header->e_ident[EI_VERSION] != EV_CURRENT)
|
||||
LOSE (0, "ELF file version ident not " STRING(EV_CURRENT));
|
||||
/* XXX We should be able so set system specific versions which are
|
||||
allowed here. */
|
||||
if (header->e_ident[EI_OSABI] != ELFOSABI_SYSV)
|
||||
LOSE (0, "ELF file OS ABI not " STRING(ELFOSABI_SYSV));
|
||||
if (header->e_ident[EI_ABIVERSION] != 0)
|
||||
LOSE (0, "ELF file ABI version not 0");
|
||||
LOSE (0, "internal error");
|
||||
}
|
||||
|
||||
if (header->e_version != EV_CURRENT)
|
||||
LOSE ("ELF file version not " STRING(EV_CURRENT));
|
||||
LOSE (0, "ELF file version not " STRING(EV_CURRENT));
|
||||
if (! elf_machine_matches_host (header->e_machine))
|
||||
LOSE ("ELF file machine architecture not " ELF_MACHINE_NAME);
|
||||
LOSE (0, "ELF file machine architecture not " ELF_MACHINE_NAME);
|
||||
if (header->e_phentsize != sizeof (ElfW(Phdr)))
|
||||
LOSE ("ELF file's phentsize not the expected size");
|
||||
LOSE (0, "ELF file's phentsize not the expected size");
|
||||
|
||||
#ifndef MAP_ANON
|
||||
#define MAP_ANON 0
|
||||
# define MAP_ANON 0
|
||||
if (_dl_zerofd == -1)
|
||||
{
|
||||
_dl_zerofd = _dl_sysdep_open_zero_fill ();
|
||||
@ -687,7 +716,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
/* Enter the new object in the list of loaded objects. */
|
||||
l = _dl_new_object (realname, name, l_type, loader);
|
||||
if (! l)
|
||||
lose (ENOMEM, "cannot create shared object descriptor");
|
||||
LOSE (ENOMEM, "cannot create shared object descriptor");
|
||||
l->l_opencount = 1;
|
||||
|
||||
/* Extract the remaining details we need from the ELF header
|
||||
@ -704,7 +733,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
phdr = alloca (maplength);
|
||||
__lseek (fd, SEEK_SET, header->e_phoff);
|
||||
if (__libc_read (fd, (void *) phdr, maplength) != maplength)
|
||||
lose (errno, "cannot read file data");
|
||||
LOSE (errno, "cannot read file data");
|
||||
}
|
||||
|
||||
{
|
||||
@ -717,9 +746,10 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
} loadcmds[l->l_phnum], *c;
|
||||
size_t nloadcmds = 0;
|
||||
|
||||
/* The struct is initialized to zero so this is not necessary:
|
||||
l->l_ld = 0;
|
||||
l->l_phdr = 0;
|
||||
l->l_addr = 0;
|
||||
l->l_addr = 0; */
|
||||
for (ph = phdr; ph < &phdr[l->l_phnum]; ++ph)
|
||||
switch (ph->p_type)
|
||||
{
|
||||
@ -737,9 +767,9 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
/* A load command tells us to map in part of the file.
|
||||
We record the load commands and process them all later. */
|
||||
if (ph->p_align % _dl_pagesize != 0)
|
||||
LOSE ("ELF load command alignment not page-aligned");
|
||||
LOSE (0, "ELF load command alignment not page-aligned");
|
||||
if ((ph->p_vaddr - ph->p_offset) % ph->p_align)
|
||||
LOSE ("ELF load command address/offset not properly aligned");
|
||||
LOSE (0, "ELF load command address/offset not properly aligned");
|
||||
{
|
||||
struct loadcmd *c = &loadcmds[nloadcmds++];
|
||||
c->mapstart = ph->p_vaddr & ~(ph->p_align - 1);
|
||||
@ -748,13 +778,34 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
c->dataend = ph->p_vaddr + ph->p_filesz;
|
||||
c->allocend = ph->p_vaddr + ph->p_memsz;
|
||||
c->mapoff = ph->p_offset & ~(ph->p_align - 1);
|
||||
c->prot = 0;
|
||||
if (ph->p_flags & PF_R)
|
||||
c->prot |= PROT_READ;
|
||||
if (ph->p_flags & PF_W)
|
||||
c->prot |= PROT_WRITE;
|
||||
if (ph->p_flags & PF_X)
|
||||
c->prot |= PROT_EXEC;
|
||||
|
||||
/* Optimize a common case. */
|
||||
if ((PF_R | PF_W | PF_X) == 7
|
||||
&& (PROT_READ | PROT_WRITE | PROT_EXEC) == 7)
|
||||
{
|
||||
static const unsigned char pf_to_prot[8] =
|
||||
{
|
||||
[0] = PROT_NONE,
|
||||
[PF_R] = PROT_READ,
|
||||
[PF_W] = PROT_WRITE,
|
||||
[PF_R | PF_W] = PROT_READ | PROT_WRITE,
|
||||
[PF_X] = PROT_EXEC,
|
||||
[PF_R | PF_X] = PROT_READ | PROT_EXEC,
|
||||
[PF_W | PF_X] = PROT_WRITE | PROT_EXEC,
|
||||
[PF_R | PF_W | PF_X] = PROT_READ | PROT_WRITE | PROT_EXEC
|
||||
};
|
||||
c->prot = pf_to_prot[ph->p_flags & (PF_R | PF_W | PF_X)];
|
||||
}
|
||||
else
|
||||
{
|
||||
c->prot = 0;
|
||||
if (ph->p_flags & PF_R)
|
||||
c->prot |= PROT_READ;
|
||||
if (ph->p_flags & PF_W)
|
||||
c->prot |= PROT_WRITE;
|
||||
if (ph->p_flags & PF_X)
|
||||
c->prot |= PROT_EXEC;
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
@ -842,7 +893,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
/* Dag nab it. */
|
||||
if (__mprotect ((caddr_t) (zero & ~(_dl_pagesize - 1)),
|
||||
_dl_pagesize, c->prot|PROT_WRITE) < 0)
|
||||
lose (errno, "cannot change memory protections");
|
||||
LOSE (errno, "cannot change memory protections");
|
||||
}
|
||||
memset ((void *) zero, 0, zeropage - zero);
|
||||
if ((c->prot & PROT_WRITE) == 0)
|
||||
@ -858,7 +909,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
c->prot, MAP_ANON|MAP_PRIVATE|MAP_FIXED,
|
||||
ANONFD, 0);
|
||||
if (mapat == MAP_FAILED)
|
||||
lose (errno, "cannot map zero-fill pages");
|
||||
LOSE (errno, "cannot map zero-fill pages");
|
||||
}
|
||||
}
|
||||
|
||||
@ -880,7 +931,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
break;
|
||||
}
|
||||
if (l->l_phdr == 0)
|
||||
LOSE ("program headers not contained in any loaded segment");
|
||||
LOSE (0, "program headers not contained in any loaded segment");
|
||||
}
|
||||
else
|
||||
/* Adjust the PT_PHDR value by the runtime load address. */
|
||||
@ -896,7 +947,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
if (l->l_ld == 0)
|
||||
{
|
||||
if (type == ET_DYN)
|
||||
LOSE ("object file has no dynamic section");
|
||||
LOSE (0, "object file has no dynamic section");
|
||||
}
|
||||
else
|
||||
(ElfW(Addr)) l->l_ld += l->l_addr;
|
||||
@ -951,7 +1002,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
|
||||
(struct link_map **) malloc (sizeof (struct link_map *));
|
||||
|
||||
if (l->l_symbolic_searchlist.r_list == NULL)
|
||||
lose (ENOMEM, "cannot create searchlist");
|
||||
LOSE (ENOMEM, "cannot create searchlist");
|
||||
|
||||
l->l_symbolic_searchlist.r_list[0] = l;
|
||||
l->l_symbolic_searchlist.r_nlist = 1;
|
||||
@ -1280,9 +1331,11 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
|
||||
|| (l = _dl_new_object (name_copy, name, type, loader)) == NULL)
|
||||
_dl_signal_error (ENOMEM, name,
|
||||
"cannot create shared object descriptor");
|
||||
/* We use an opencount of 0 as a sign for the faked entry. */
|
||||
/* We use an opencount of 0 as a sign for the faked entry.
|
||||
Since the descriptor is initialized with zero we do not
|
||||
have do this here.
|
||||
l->l_opencount = 0;
|
||||
l->l_reserved = 0;
|
||||
l->l_reserved = 0; */
|
||||
l->l_buckets = &dummy_bucket;
|
||||
l->l_nbuckets = 1;
|
||||
l->l_relocated = 1;
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
/* Run-time dynamic linker data structures for loaded ELF shared objects.
|
||||
Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
|
||||
Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
@ -205,7 +205,8 @@ extern int _dl_secure;
|
||||
extern void _dl_signal_error (int errcode,
|
||||
const char *object,
|
||||
const char *errstring)
|
||||
internal_function;
|
||||
internal_function
|
||||
__attribute__ ((__noreturn__));
|
||||
|
||||
/* Call OPERATE, catching errors from `dl_signal_error'. If there is no
|
||||
error, *ERRSTRING is set to null. If there is an error, *ERRSTRING is
|
||||
|
||||
Loading…
Reference in New Issue
Block a user