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elf: Merge dl-sysdep.c into the Linux version
The generic version is the de-facto Linux implementation. It requires an auxiliary vector, so Hurd does not use it. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
parent
9e94f57484
commit
91c0a47ffb
352
elf/dl-sysdep.c
352
elf/dl-sysdep.c
@ -1,4 +1,4 @@
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/* Operating system support for run-time dynamic linker. Generic Unix version.
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/* Operating system support for run-time dynamic linker. Stub version.
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Copyright (C) 1995-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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@ -16,352 +16,4 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* We conditionalize the whole of this file rather than simply eliding it
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from the static build, because other sysdeps/ versions of this file
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might define things needed by a static build. */
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#ifdef SHARED
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#include <assert.h>
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#include <elf.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libintl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <ldsodefs.h>
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#include <_itoa.h>
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#include <fpu_control.h>
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#include <entry.h>
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#include <dl-machine.h>
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#include <dl-procinfo.h>
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#include <dl-osinfo.h>
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#include <libc-internal.h>
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#include <tls.h>
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#include <dl-tunables.h>
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#include <dl-auxv.h>
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#include <dl-hwcap-check.h>
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extern char **_environ attribute_hidden;
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extern char _end[] attribute_hidden;
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/* Protect SUID program against misuse of file descriptors. */
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extern void __libc_check_standard_fds (void);
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int __libc_enable_secure attribute_relro = 0;
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rtld_hidden_data_def (__libc_enable_secure)
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/* This variable contains the lowest stack address ever used. */
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void *__libc_stack_end attribute_relro = NULL;
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rtld_hidden_data_def(__libc_stack_end)
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void *_dl_random attribute_relro = NULL;
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#ifndef DL_FIND_ARG_COMPONENTS
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# define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \
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do { \
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void **_tmp; \
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(argc) = *(long int *) cookie; \
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(argv) = (char **) ((long int *) cookie + 1); \
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(envp) = (argv) + (argc) + 1; \
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for (_tmp = (void **) (envp); *_tmp; ++_tmp) \
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continue; \
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(auxp) = (void *) ++_tmp; \
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} while (0)
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#endif
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#ifndef DL_STACK_END
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# define DL_STACK_END(cookie) ((void *) (cookie))
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#endif
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ElfW(Addr)
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_dl_sysdep_start (void **start_argptr,
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void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum,
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ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv))
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{
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const ElfW(Phdr) *phdr = NULL;
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ElfW(Word) phnum = 0;
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ElfW(Addr) user_entry;
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ElfW(auxv_t) *av;
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#ifdef HAVE_AUX_SECURE
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# define set_seen(tag) (tag) /* Evaluate for the side effects. */
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# define set_seen_secure() ((void) 0)
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#else
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uid_t uid = 0;
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gid_t gid = 0;
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unsigned int seen = 0;
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# define set_seen_secure() (seen = -1)
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# ifdef HAVE_AUX_XID
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# define set_seen(tag) (tag) /* Evaluate for the side effects. */
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# else
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# define M(type) (1 << (type))
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# define set_seen(tag) seen |= M ((tag)->a_type)
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# endif
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#endif
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#ifdef NEED_DL_SYSINFO
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uintptr_t new_sysinfo = 0;
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#endif
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__libc_stack_end = DL_STACK_END (start_argptr);
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DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, _dl_argv, _environ,
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GLRO(dl_auxv));
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user_entry = (ElfW(Addr)) ENTRY_POINT;
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GLRO(dl_platform) = NULL; /* Default to nothing known about the platform. */
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/* NB: Default to a constant CONSTANT_MINSIGSTKSZ. */
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_Static_assert (__builtin_constant_p (CONSTANT_MINSIGSTKSZ),
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"CONSTANT_MINSIGSTKSZ is constant");
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GLRO(dl_minsigstacksize) = CONSTANT_MINSIGSTKSZ;
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for (av = GLRO(dl_auxv); av->a_type != AT_NULL; set_seen (av++))
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switch (av->a_type)
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{
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case AT_PHDR:
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phdr = (void *) av->a_un.a_val;
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break;
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case AT_PHNUM:
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phnum = av->a_un.a_val;
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break;
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case AT_PAGESZ:
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GLRO(dl_pagesize) = av->a_un.a_val;
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break;
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case AT_ENTRY:
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user_entry = av->a_un.a_val;
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break;
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#ifndef HAVE_AUX_SECURE
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case AT_UID:
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case AT_EUID:
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uid ^= av->a_un.a_val;
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break;
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case AT_GID:
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case AT_EGID:
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gid ^= av->a_un.a_val;
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break;
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#endif
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case AT_SECURE:
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#ifndef HAVE_AUX_SECURE
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seen = -1;
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#endif
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__libc_enable_secure = av->a_un.a_val;
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break;
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case AT_PLATFORM:
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GLRO(dl_platform) = (void *) av->a_un.a_val;
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break;
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case AT_HWCAP:
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GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
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break;
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case AT_HWCAP2:
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GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val;
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break;
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case AT_CLKTCK:
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GLRO(dl_clktck) = av->a_un.a_val;
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break;
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case AT_FPUCW:
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GLRO(dl_fpu_control) = av->a_un.a_val;
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break;
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#ifdef NEED_DL_SYSINFO
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case AT_SYSINFO:
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new_sysinfo = av->a_un.a_val;
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break;
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#endif
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#ifdef NEED_DL_SYSINFO_DSO
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case AT_SYSINFO_EHDR:
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GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val;
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break;
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#endif
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case AT_RANDOM:
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_dl_random = (void *) av->a_un.a_val;
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break;
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case AT_MINSIGSTKSZ:
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GLRO(dl_minsigstacksize) = av->a_un.a_val;
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break;
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DL_PLATFORM_AUXV
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}
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dl_hwcap_check ();
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#ifndef HAVE_AUX_SECURE
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if (seen != -1)
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{
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/* Fill in the values we have not gotten from the kernel through the
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auxiliary vector. */
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# ifndef HAVE_AUX_XID
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# define SEE(UID, var, uid) \
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if ((seen & M (AT_##UID)) == 0) var ^= __get##uid ()
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SEE (UID, uid, uid);
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SEE (EUID, uid, euid);
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SEE (GID, gid, gid);
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SEE (EGID, gid, egid);
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# endif
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/* If one of the two pairs of IDs does not match this is a setuid
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or setgid run. */
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__libc_enable_secure = uid | gid;
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}
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#endif
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#ifndef HAVE_AUX_PAGESIZE
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if (GLRO(dl_pagesize) == 0)
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GLRO(dl_pagesize) = __getpagesize ();
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#endif
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#ifdef NEED_DL_SYSINFO
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if (new_sysinfo != 0)
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{
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# ifdef NEED_DL_SYSINFO_DSO
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/* Only set the sysinfo value if we also have the vsyscall DSO. */
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if (GLRO(dl_sysinfo_dso) != 0)
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# endif
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GLRO(dl_sysinfo) = new_sysinfo;
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}
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#endif
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__tunables_init (_environ);
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/* Initialize DSO sorting algorithm after tunables. */
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_dl_sort_maps_init ();
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#ifdef DL_SYSDEP_INIT
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DL_SYSDEP_INIT;
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#endif
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#ifdef DL_PLATFORM_INIT
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DL_PLATFORM_INIT;
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#endif
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/* Determine the length of the platform name. */
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if (GLRO(dl_platform) != NULL)
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GLRO(dl_platformlen) = strlen (GLRO(dl_platform));
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if (__sbrk (0) == _end)
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/* The dynamic linker was run as a program, and so the initial break
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starts just after our bss, at &_end. The malloc in dl-minimal.c
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will consume the rest of this page, so tell the kernel to move the
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break up that far. When the user program examines its break, it
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will see this new value and not clobber our data. */
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__sbrk (GLRO(dl_pagesize)
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- ((_end - (char *) 0) & (GLRO(dl_pagesize) - 1)));
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/* If this is a SUID program we make sure that FDs 0, 1, and 2 are
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allocated. If necessary we are doing it ourself. If it is not
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possible we stop the program. */
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if (__builtin_expect (__libc_enable_secure, 0))
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__libc_check_standard_fds ();
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(*dl_main) (phdr, phnum, &user_entry, GLRO(dl_auxv));
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return user_entry;
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}
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void
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_dl_sysdep_start_cleanup (void)
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{
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}
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void
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_dl_show_auxv (void)
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{
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char buf[64];
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ElfW(auxv_t) *av;
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/* Terminate string. */
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buf[63] = '\0';
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/* The following code assumes that the AT_* values are encoded
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starting from 0 with AT_NULL, 1 for AT_IGNORE, and all other values
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close by (otherwise the array will be too large). In case we have
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to support a platform where these requirements are not fulfilled
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some alternative implementation has to be used. */
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for (av = GLRO(dl_auxv); av->a_type != AT_NULL; ++av)
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{
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static const struct
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{
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const char label[22];
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enum { unknown = 0, dec, hex, str, ignore } form : 8;
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} auxvars[] =
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{
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[AT_EXECFD - 2] = { "EXECFD: ", dec },
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[AT_EXECFN - 2] = { "EXECFN: ", str },
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[AT_PHDR - 2] = { "PHDR: 0x", hex },
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[AT_PHENT - 2] = { "PHENT: ", dec },
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[AT_PHNUM - 2] = { "PHNUM: ", dec },
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[AT_PAGESZ - 2] = { "PAGESZ: ", dec },
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[AT_BASE - 2] = { "BASE: 0x", hex },
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[AT_FLAGS - 2] = { "FLAGS: 0x", hex },
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[AT_ENTRY - 2] = { "ENTRY: 0x", hex },
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[AT_NOTELF - 2] = { "NOTELF: ", hex },
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[AT_UID - 2] = { "UID: ", dec },
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[AT_EUID - 2] = { "EUID: ", dec },
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[AT_GID - 2] = { "GID: ", dec },
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[AT_EGID - 2] = { "EGID: ", dec },
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[AT_PLATFORM - 2] = { "PLATFORM: ", str },
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[AT_HWCAP - 2] = { "HWCAP: ", hex },
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[AT_CLKTCK - 2] = { "CLKTCK: ", dec },
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[AT_FPUCW - 2] = { "FPUCW: ", hex },
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[AT_DCACHEBSIZE - 2] = { "DCACHEBSIZE: 0x", hex },
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[AT_ICACHEBSIZE - 2] = { "ICACHEBSIZE: 0x", hex },
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[AT_UCACHEBSIZE - 2] = { "UCACHEBSIZE: 0x", hex },
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[AT_IGNOREPPC - 2] = { "IGNOREPPC", ignore },
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[AT_SECURE - 2] = { "SECURE: ", dec },
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[AT_BASE_PLATFORM - 2] = { "BASE_PLATFORM: ", str },
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[AT_SYSINFO - 2] = { "SYSINFO: 0x", hex },
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[AT_SYSINFO_EHDR - 2] = { "SYSINFO_EHDR: 0x", hex },
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[AT_RANDOM - 2] = { "RANDOM: 0x", hex },
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[AT_HWCAP2 - 2] = { "HWCAP2: 0x", hex },
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[AT_MINSIGSTKSZ - 2] = { "MINSIGSTKSZ: ", dec },
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[AT_L1I_CACHESIZE - 2] = { "L1I_CACHESIZE: ", dec },
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[AT_L1I_CACHEGEOMETRY - 2] = { "L1I_CACHEGEOMETRY: 0x", hex },
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[AT_L1D_CACHESIZE - 2] = { "L1D_CACHESIZE: ", dec },
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[AT_L1D_CACHEGEOMETRY - 2] = { "L1D_CACHEGEOMETRY: 0x", hex },
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[AT_L2_CACHESIZE - 2] = { "L2_CACHESIZE: ", dec },
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[AT_L2_CACHEGEOMETRY - 2] = { "L2_CACHEGEOMETRY: 0x", hex },
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[AT_L3_CACHESIZE - 2] = { "L3_CACHESIZE: ", dec },
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[AT_L3_CACHEGEOMETRY - 2] = { "L3_CACHEGEOMETRY: 0x", hex },
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};
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unsigned int idx = (unsigned int) (av->a_type - 2);
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if ((unsigned int) av->a_type < 2u
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|| (idx < sizeof (auxvars) / sizeof (auxvars[0])
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&& auxvars[idx].form == ignore))
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continue;
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assert (AT_NULL == 0);
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assert (AT_IGNORE == 1);
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/* Some entries are handled in a special way per platform. */
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if (_dl_procinfo (av->a_type, av->a_un.a_val) == 0)
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continue;
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if (idx < sizeof (auxvars) / sizeof (auxvars[0])
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&& auxvars[idx].form != unknown)
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{
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const char *val = (char *) av->a_un.a_val;
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if (__builtin_expect (auxvars[idx].form, dec) == dec)
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val = _itoa ((unsigned long int) av->a_un.a_val,
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buf + sizeof buf - 1, 10, 0);
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else if (__builtin_expect (auxvars[idx].form, hex) == hex)
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val = _itoa ((unsigned long int) av->a_un.a_val,
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buf + sizeof buf - 1, 16, 0);
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_dl_printf ("AT_%s%s\n", auxvars[idx].label, val);
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continue;
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}
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/* Unknown value: print a generic line. */
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char buf2[17];
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buf2[sizeof (buf2) - 1] = '\0';
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const char *val2 = _itoa ((unsigned long int) av->a_un.a_val,
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buf2 + sizeof buf2 - 1, 16, 0);
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const char *val = _itoa ((unsigned long int) av->a_type,
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buf + sizeof buf - 1, 16, 0);
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_dl_printf ("AT_??? (0x%s): 0x%s\n", val, val2);
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}
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}
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#endif
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#error dl-sysdep support missing.
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@ -16,28 +16,351 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Linux needs some special initialization, but otherwise uses
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the generic dynamic linker system interface code. */
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#include <string.h>
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#include <_itoa.h>
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#include <assert.h>
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#include <dl-auxv.h>
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#include <dl-hwcap-check.h>
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#include <dl-osinfo.h>
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#include <dl-procinfo.h>
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#include <dl-tunables.h>
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#include <elf.h>
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#include <entry.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <sys/utsname.h>
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#include <fpu_control.h>
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#include <ldsodefs.h>
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#include <libc-internal.h>
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#include <libintl.h>
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#include <not-cancel.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/utsname.h>
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#include <tls.h>
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#include <unistd.h>
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#include <dl-machine.h>
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|
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#ifdef SHARED
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# define DL_SYSDEP_INIT frob_brk ()
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extern char **_environ attribute_hidden;
|
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extern char _end[] attribute_hidden;
|
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|
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static inline void
|
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frob_brk (void)
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/* Protect SUID program against misuse of file descriptors. */
|
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extern void __libc_check_standard_fds (void);
|
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|
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int __libc_enable_secure attribute_relro = 0;
|
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rtld_hidden_data_def (__libc_enable_secure)
|
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/* This variable contains the lowest stack address ever used. */
|
||||
void *__libc_stack_end attribute_relro = NULL;
|
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rtld_hidden_data_def(__libc_stack_end)
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void *_dl_random attribute_relro = NULL;
|
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|
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#ifndef DL_FIND_ARG_COMPONENTS
|
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# define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \
|
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do { \
|
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void **_tmp; \
|
||||
(argc) = *(long int *) cookie; \
|
||||
(argv) = (char **) ((long int *) cookie + 1); \
|
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(envp) = (argv) + (argc) + 1; \
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for (_tmp = (void **) (envp); *_tmp; ++_tmp) \
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continue; \
|
||||
(auxp) = (void *) ++_tmp; \
|
||||
} while (0)
|
||||
#endif
|
||||
|
||||
#ifndef DL_STACK_END
|
||||
# define DL_STACK_END(cookie) ((void *) (cookie))
|
||||
#endif
|
||||
|
||||
ElfW(Addr)
|
||||
_dl_sysdep_start (void **start_argptr,
|
||||
void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum,
|
||||
ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv))
|
||||
{
|
||||
const ElfW(Phdr) *phdr = NULL;
|
||||
ElfW(Word) phnum = 0;
|
||||
ElfW(Addr) user_entry;
|
||||
ElfW(auxv_t) *av;
|
||||
#ifdef HAVE_AUX_SECURE
|
||||
# define set_seen(tag) (tag) /* Evaluate for the side effects. */
|
||||
# define set_seen_secure() ((void) 0)
|
||||
#else
|
||||
uid_t uid = 0;
|
||||
gid_t gid = 0;
|
||||
unsigned int seen = 0;
|
||||
# define set_seen_secure() (seen = -1)
|
||||
# ifdef HAVE_AUX_XID
|
||||
# define set_seen(tag) (tag) /* Evaluate for the side effects. */
|
||||
# else
|
||||
# define M(type) (1 << (type))
|
||||
# define set_seen(tag) seen |= M ((tag)->a_type)
|
||||
# endif
|
||||
#endif
|
||||
#ifdef NEED_DL_SYSINFO
|
||||
uintptr_t new_sysinfo = 0;
|
||||
#endif
|
||||
|
||||
__libc_stack_end = DL_STACK_END (start_argptr);
|
||||
DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, _dl_argv, _environ,
|
||||
GLRO(dl_auxv));
|
||||
|
||||
user_entry = (ElfW(Addr)) ENTRY_POINT;
|
||||
GLRO(dl_platform) = NULL; /* Default to nothing known about the platform. */
|
||||
|
||||
/* NB: Default to a constant CONSTANT_MINSIGSTKSZ. */
|
||||
_Static_assert (__builtin_constant_p (CONSTANT_MINSIGSTKSZ),
|
||||
"CONSTANT_MINSIGSTKSZ is constant");
|
||||
GLRO(dl_minsigstacksize) = CONSTANT_MINSIGSTKSZ;
|
||||
|
||||
for (av = GLRO(dl_auxv); av->a_type != AT_NULL; set_seen (av++))
|
||||
switch (av->a_type)
|
||||
{
|
||||
case AT_PHDR:
|
||||
phdr = (void *) av->a_un.a_val;
|
||||
break;
|
||||
case AT_PHNUM:
|
||||
phnum = av->a_un.a_val;
|
||||
break;
|
||||
case AT_PAGESZ:
|
||||
GLRO(dl_pagesize) = av->a_un.a_val;
|
||||
break;
|
||||
case AT_ENTRY:
|
||||
user_entry = av->a_un.a_val;
|
||||
break;
|
||||
#ifndef HAVE_AUX_SECURE
|
||||
case AT_UID:
|
||||
case AT_EUID:
|
||||
uid ^= av->a_un.a_val;
|
||||
break;
|
||||
case AT_GID:
|
||||
case AT_EGID:
|
||||
gid ^= av->a_un.a_val;
|
||||
break;
|
||||
#endif
|
||||
case AT_SECURE:
|
||||
#ifndef HAVE_AUX_SECURE
|
||||
seen = -1;
|
||||
#endif
|
||||
__libc_enable_secure = av->a_un.a_val;
|
||||
break;
|
||||
case AT_PLATFORM:
|
||||
GLRO(dl_platform) = (void *) av->a_un.a_val;
|
||||
break;
|
||||
case AT_HWCAP:
|
||||
GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
|
||||
break;
|
||||
case AT_HWCAP2:
|
||||
GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val;
|
||||
break;
|
||||
case AT_CLKTCK:
|
||||
GLRO(dl_clktck) = av->a_un.a_val;
|
||||
break;
|
||||
case AT_FPUCW:
|
||||
GLRO(dl_fpu_control) = av->a_un.a_val;
|
||||
break;
|
||||
#ifdef NEED_DL_SYSINFO
|
||||
case AT_SYSINFO:
|
||||
new_sysinfo = av->a_un.a_val;
|
||||
break;
|
||||
#endif
|
||||
#ifdef NEED_DL_SYSINFO_DSO
|
||||
case AT_SYSINFO_EHDR:
|
||||
GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val;
|
||||
break;
|
||||
#endif
|
||||
case AT_RANDOM:
|
||||
_dl_random = (void *) av->a_un.a_val;
|
||||
break;
|
||||
case AT_MINSIGSTKSZ:
|
||||
GLRO(dl_minsigstacksize) = av->a_un.a_val;
|
||||
break;
|
||||
DL_PLATFORM_AUXV
|
||||
}
|
||||
|
||||
dl_hwcap_check ();
|
||||
|
||||
#ifndef HAVE_AUX_SECURE
|
||||
if (seen != -1)
|
||||
{
|
||||
/* Fill in the values we have not gotten from the kernel through the
|
||||
auxiliary vector. */
|
||||
# ifndef HAVE_AUX_XID
|
||||
# define SEE(UID, var, uid) \
|
||||
if ((seen & M (AT_##UID)) == 0) var ^= __get##uid ()
|
||||
SEE (UID, uid, uid);
|
||||
SEE (EUID, uid, euid);
|
||||
SEE (GID, gid, gid);
|
||||
SEE (EGID, gid, egid);
|
||||
# endif
|
||||
|
||||
/* If one of the two pairs of IDs does not match this is a setuid
|
||||
or setgid run. */
|
||||
__libc_enable_secure = uid | gid;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef HAVE_AUX_PAGESIZE
|
||||
if (GLRO(dl_pagesize) == 0)
|
||||
GLRO(dl_pagesize) = __getpagesize ();
|
||||
#endif
|
||||
|
||||
#ifdef NEED_DL_SYSINFO
|
||||
if (new_sysinfo != 0)
|
||||
{
|
||||
# ifdef NEED_DL_SYSINFO_DSO
|
||||
/* Only set the sysinfo value if we also have the vsyscall DSO. */
|
||||
if (GLRO(dl_sysinfo_dso) != 0)
|
||||
# endif
|
||||
GLRO(dl_sysinfo) = new_sysinfo;
|
||||
}
|
||||
#endif
|
||||
|
||||
__tunables_init (_environ);
|
||||
|
||||
/* Initialize DSO sorting algorithm after tunables. */
|
||||
_dl_sort_maps_init ();
|
||||
|
||||
__brk (0); /* Initialize the break. */
|
||||
|
||||
#ifdef DL_PLATFORM_INIT
|
||||
DL_PLATFORM_INIT;
|
||||
#endif
|
||||
|
||||
/* Determine the length of the platform name. */
|
||||
if (GLRO(dl_platform) != NULL)
|
||||
GLRO(dl_platformlen) = strlen (GLRO(dl_platform));
|
||||
|
||||
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. */
|
||||
__sbrk (GLRO(dl_pagesize)
|
||||
- ((_end - (char *) 0) & (GLRO(dl_pagesize) - 1)));
|
||||
|
||||
/* If this is a SUID program we make sure that FDs 0, 1, and 2 are
|
||||
allocated. If necessary we are doing it ourself. If it is not
|
||||
possible we stop the program. */
|
||||
if (__builtin_expect (__libc_enable_secure, 0))
|
||||
__libc_check_standard_fds ();
|
||||
|
||||
(*dl_main) (phdr, phnum, &user_entry, GLRO(dl_auxv));
|
||||
return user_entry;
|
||||
}
|
||||
|
||||
# include <elf/dl-sysdep.c>
|
||||
#endif
|
||||
void
|
||||
_dl_sysdep_start_cleanup (void)
|
||||
{
|
||||
}
|
||||
|
||||
void
|
||||
_dl_show_auxv (void)
|
||||
{
|
||||
char buf[64];
|
||||
ElfW(auxv_t) *av;
|
||||
|
||||
/* Terminate string. */
|
||||
buf[63] = '\0';
|
||||
|
||||
/* The following code assumes that the AT_* values are encoded
|
||||
starting from 0 with AT_NULL, 1 for AT_IGNORE, and all other values
|
||||
close by (otherwise the array will be too large). In case we have
|
||||
to support a platform where these requirements are not fulfilled
|
||||
some alternative implementation has to be used. */
|
||||
for (av = GLRO(dl_auxv); av->a_type != AT_NULL; ++av)
|
||||
{
|
||||
static const struct
|
||||
{
|
||||
const char label[22];
|
||||
enum { unknown = 0, dec, hex, str, ignore } form : 8;
|
||||
} auxvars[] =
|
||||
{
|
||||
[AT_EXECFD - 2] = { "EXECFD: ", dec },
|
||||
[AT_EXECFN - 2] = { "EXECFN: ", str },
|
||||
[AT_PHDR - 2] = { "PHDR: 0x", hex },
|
||||
[AT_PHENT - 2] = { "PHENT: ", dec },
|
||||
[AT_PHNUM - 2] = { "PHNUM: ", dec },
|
||||
[AT_PAGESZ - 2] = { "PAGESZ: ", dec },
|
||||
[AT_BASE - 2] = { "BASE: 0x", hex },
|
||||
[AT_FLAGS - 2] = { "FLAGS: 0x", hex },
|
||||
[AT_ENTRY - 2] = { "ENTRY: 0x", hex },
|
||||
[AT_NOTELF - 2] = { "NOTELF: ", hex },
|
||||
[AT_UID - 2] = { "UID: ", dec },
|
||||
[AT_EUID - 2] = { "EUID: ", dec },
|
||||
[AT_GID - 2] = { "GID: ", dec },
|
||||
[AT_EGID - 2] = { "EGID: ", dec },
|
||||
[AT_PLATFORM - 2] = { "PLATFORM: ", str },
|
||||
[AT_HWCAP - 2] = { "HWCAP: ", hex },
|
||||
[AT_CLKTCK - 2] = { "CLKTCK: ", dec },
|
||||
[AT_FPUCW - 2] = { "FPUCW: ", hex },
|
||||
[AT_DCACHEBSIZE - 2] = { "DCACHEBSIZE: 0x", hex },
|
||||
[AT_ICACHEBSIZE - 2] = { "ICACHEBSIZE: 0x", hex },
|
||||
[AT_UCACHEBSIZE - 2] = { "UCACHEBSIZE: 0x", hex },
|
||||
[AT_IGNOREPPC - 2] = { "IGNOREPPC", ignore },
|
||||
[AT_SECURE - 2] = { "SECURE: ", dec },
|
||||
[AT_BASE_PLATFORM - 2] = { "BASE_PLATFORM: ", str },
|
||||
[AT_SYSINFO - 2] = { "SYSINFO: 0x", hex },
|
||||
[AT_SYSINFO_EHDR - 2] = { "SYSINFO_EHDR: 0x", hex },
|
||||
[AT_RANDOM - 2] = { "RANDOM: 0x", hex },
|
||||
[AT_HWCAP2 - 2] = { "HWCAP2: 0x", hex },
|
||||
[AT_MINSIGSTKSZ - 2] = { "MINSIGSTKSZ: ", dec },
|
||||
[AT_L1I_CACHESIZE - 2] = { "L1I_CACHESIZE: ", dec },
|
||||
[AT_L1I_CACHEGEOMETRY - 2] = { "L1I_CACHEGEOMETRY: 0x", hex },
|
||||
[AT_L1D_CACHESIZE - 2] = { "L1D_CACHESIZE: ", dec },
|
||||
[AT_L1D_CACHEGEOMETRY - 2] = { "L1D_CACHEGEOMETRY: 0x", hex },
|
||||
[AT_L2_CACHESIZE - 2] = { "L2_CACHESIZE: ", dec },
|
||||
[AT_L2_CACHEGEOMETRY - 2] = { "L2_CACHEGEOMETRY: 0x", hex },
|
||||
[AT_L3_CACHESIZE - 2] = { "L3_CACHESIZE: ", dec },
|
||||
[AT_L3_CACHEGEOMETRY - 2] = { "L3_CACHEGEOMETRY: 0x", hex },
|
||||
};
|
||||
unsigned int idx = (unsigned int) (av->a_type - 2);
|
||||
|
||||
if ((unsigned int) av->a_type < 2u
|
||||
|| (idx < sizeof (auxvars) / sizeof (auxvars[0])
|
||||
&& auxvars[idx].form == ignore))
|
||||
continue;
|
||||
|
||||
assert (AT_NULL == 0);
|
||||
assert (AT_IGNORE == 1);
|
||||
|
||||
/* Some entries are handled in a special way per platform. */
|
||||
if (_dl_procinfo (av->a_type, av->a_un.a_val) == 0)
|
||||
continue;
|
||||
|
||||
if (idx < sizeof (auxvars) / sizeof (auxvars[0])
|
||||
&& auxvars[idx].form != unknown)
|
||||
{
|
||||
const char *val = (char *) av->a_un.a_val;
|
||||
|
||||
if (__builtin_expect (auxvars[idx].form, dec) == dec)
|
||||
val = _itoa ((unsigned long int) av->a_un.a_val,
|
||||
buf + sizeof buf - 1, 10, 0);
|
||||
else if (__builtin_expect (auxvars[idx].form, hex) == hex)
|
||||
val = _itoa ((unsigned long int) av->a_un.a_val,
|
||||
buf + sizeof buf - 1, 16, 0);
|
||||
|
||||
_dl_printf ("AT_%s%s\n", auxvars[idx].label, val);
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Unknown value: print a generic line. */
|
||||
char buf2[17];
|
||||
buf2[sizeof (buf2) - 1] = '\0';
|
||||
const char *val2 = _itoa ((unsigned long int) av->a_un.a_val,
|
||||
buf2 + sizeof buf2 - 1, 16, 0);
|
||||
const char *val = _itoa ((unsigned long int) av->a_type,
|
||||
buf + sizeof buf - 1, 16, 0);
|
||||
_dl_printf ("AT_??? (0x%s): 0x%s\n", val, val2);
|
||||
}
|
||||
}
|
||||
|
||||
#endif /* SHARED */
|
||||
|
||||
|
||||
int
|
||||
|
||||
Loading…
Reference in New Issue
Block a user