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Diffstat (limited to 'sysdeps/unix/sysv/linux/dl-osinfo.h')
-rw-r--r--sysdeps/unix/sysv/linux/dl-osinfo.h226
1 files changed, 63 insertions, 163 deletions
diff --git a/sysdeps/unix/sysv/linux/dl-osinfo.h b/sysdeps/unix/sysv/linux/dl-osinfo.h
index 3c93218dfc..abc67fcdcf 100644
--- a/sysdeps/unix/sysv/linux/dl-osinfo.h
+++ b/sysdeps/unix/sysv/linux/dl-osinfo.h
@@ -1,5 +1,5 @@
-/* Operating system specific code for generic dynamic loader functions. Linux.
- Copyright (C) 2000,2001,2002,2004,2005,2006 Free Software Foundation, Inc.
+/* Operating system specific code for generic dynamic loader functions.
+ Copyright (C) 2000, 2001, 2002, 2004 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
@@ -18,14 +18,10 @@
02111-1307 USA. */
#include <string.h>
-#include <errno.h>
#include <fcntl.h>
+#include <sys/sysctl.h>
#include <sys/utsname.h>
-#include <kernel-features.h>
-#include <dl-sysdep.h>
-#include <stdint.h>
-#include <hp-timing.h>
-#include <endian.h>
+#include "kernel-features.h"
#ifndef MIN
# define MIN(a,b) (((a)<(b))?(a):(b))
@@ -43,167 +39,71 @@ dl_fatal (const char *str)
}
#endif
-static inline int __attribute__ ((always_inline))
-_dl_discover_osversion (void)
-{
-#if (defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO) && defined SHARED
- if (GLRO(dl_sysinfo_map) != NULL)
- {
- /* If the kernel-supplied DSO contains a note indicating the kernel's
- version, we don't need to call uname or parse any strings. */
-
- static const struct
- {
- ElfW(Word) vendorlen;
- ElfW(Word) datalen;
- ElfW(Word) type;
- char vendor[8];
- } expected_note = { sizeof "Linux", sizeof (ElfW(Word)), 0, "Linux" };
- const ElfW(Phdr) *const phdr = GLRO(dl_sysinfo_map)->l_phdr;
- const ElfW(Word) phnum = GLRO(dl_sysinfo_map)->l_phnum;
- for (uint_fast16_t i = 0; i < phnum; ++i)
- if (phdr[i].p_type == PT_NOTE)
- {
- const ElfW(Addr) start = (phdr[i].p_vaddr
- + GLRO(dl_sysinfo_map)->l_addr);
- const struct
- {
- ElfW(Word) vendorlen;
- ElfW(Word) datalen;
- ElfW(Word) type;
- } *note = (const void *) start;
- while ((ElfW(Addr)) (note + 1) - start < phdr[i].p_memsz)
- {
- if (!memcmp (note, &expected_note, sizeof expected_note))
- return *(const ElfW(Word) *) ((const void *) note
- + sizeof expected_note);
-#define ROUND(len) (((len) + sizeof (ElfW(Word)) - 1) & -sizeof (ElfW(Word)))
- note = ((const void *) (note + 1)
- + ROUND (note->vendorlen) + ROUND (note->datalen));
- }
- }
- }
-#endif
-
- char bufmem[64];
- char *buf = bufmem;
- unsigned int version;
- int parts;
- char *cp;
- struct utsname uts;
-
- /* Try the uname system call. */
- if (__uname (&uts))
- {
- /* This was not successful. Now try reading the /proc filesystem. */
- int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY);
- if (fd < 0)
- return -1;
- ssize_t reslen = __read (fd, bufmem, sizeof (bufmem));
- __close (fd);
- if (reslen <= 0)
- /* This also didn't work. We give up since we cannot
- make sure the library can actually work. */
- return -1;
- buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0';
- }
- else
- buf = uts.release;
-
- /* Now convert it into a number. The string consists of at most
- three parts. */
- version = 0;
- parts = 0;
- cp = buf;
- while ((*cp >= '0') && (*cp <= '9'))
- {
- unsigned int here = *cp++ - '0';
-
- while ((*cp >= '0') && (*cp <= '9'))
- {
- here *= 10;
- here += *cp++ - '0';
- }
- ++parts;
- version <<= 8;
- version |= here;
-
- if (*cp++ != '.')
- /* Another part following? */
- break;
- }
-
- if (parts < 3)
- version <<= 8 * (3 - parts);
-
- return version;
-}
-
-#define DL_SYSDEP_OSCHECK(FATAL) \
+#define DL_SYSDEP_OSCHECK(FATAL) \
do { \
- /* Test whether the kernel is new enough. This test is only performed \
- if the library is not compiled to run on all kernels. */ \
- \
- int version = _dl_discover_osversion (); \
- if (__builtin_expect (version >= 0, 1)) \
+ /* Test whether the kernel is new enough. This test is only \
+ performed if the library is not compiled to run on all \
+ kernels. */ \
+ if (__LINUX_KERNEL_VERSION > 0) \
{ \
- if (__builtin_expect (GLRO(dl_osversion) == 0, 1) \
- || GLRO(dl_osversion) > version) \
- GLRO(dl_osversion) = version; \
+ char bufmem[64]; \
+ char *buf = bufmem; \
+ unsigned int version; \
+ int parts; \
+ char *cp; \
+ struct utsname uts; \
+ \
+ /* Try the uname syscall */ \
+ if (__uname (&uts)) \
+ { \
+ /* This was not successful. Now try reading the /proc \
+ filesystem. */ \
+ ssize_t reslen; \
+ int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY); \
+ if (fd == -1 \
+ || (reslen = __read (fd, bufmem, sizeof (bufmem))) <= 0) \
+ /* This also didn't work. We give up since we cannot \
+ make sure the library can actually work. */ \
+ FATAL ("FATAL: cannot determine kernel version\n"); \
+ __close (fd); \
+ buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0'; \
+ } \
+ else \
+ buf = uts.release; \
+ \
+ /* Now convert it into a number. The string consists of at most \
+ three parts. */ \
+ version = 0; \
+ parts = 0; \
+ cp = buf; \
+ while ((*cp >= '0') && (*cp <= '9')) \
+ { \
+ unsigned int here = *cp++ - '0'; \
+ \
+ while ((*cp >= '0') && (*cp <= '9')) \
+ { \
+ here *= 10; \
+ here += *cp++ - '0'; \
+ } \
+ \
+ ++parts; \
+ version <<= 8; \
+ version |= here; \
+ \
+ if (*cp++ != '.') \
+ /* Another part following? */ \
+ break; \
+ } \
+ \
+ if (parts < 3) \
+ version <<= 8 * (3 - parts); \
\
/* Now we can test with the required version. */ \
- if (__LINUX_KERNEL_VERSION > 0 && version < __LINUX_KERNEL_VERSION) \
+ if (version < __LINUX_KERNEL_VERSION) \
/* Not sufficent. */ \
FATAL ("FATAL: kernel too old\n"); \
+ \
+ GLRO(dl_osversion) = version; \
} \
- else if (__LINUX_KERNEL_VERSION > 0) \
- FATAL ("FATAL: cannot determine kernel version\n"); \
} while (0)
-
-static inline uintptr_t __attribute__ ((always_inline))
-_dl_setup_stack_chk_guard (void)
-{
- uintptr_t ret;
-#ifdef ENABLE_STACKGUARD_RANDOMIZE
- int fd = __open ("/dev/urandom", O_RDONLY);
- if (fd >= 0)
- {
- ssize_t reslen = __read (fd, &ret, sizeof (ret));
- __close (fd);
- if (reslen == (ssize_t) sizeof (ret))
- return ret;
- }
-#endif
- ret = 0;
- unsigned char *p = (unsigned char *) &ret;
- p[sizeof (ret) - 1] = 255;
- p[sizeof (ret) - 2] = '\n';
-#ifdef HP_TIMING_NOW
- hp_timing_t hpt;
- HP_TIMING_NOW (hpt);
- hpt = (hpt & 0xffff) << 8;
- ret ^= hpt;
-#endif
- uintptr_t stk;
- /* Avoid GCC being too smart. */
- asm ("" : "=r" (stk) : "r" (p));
- stk &= 0x7ffff0;
-#if __BYTE_ORDER == __LITTLE_ENDIAN
- stk <<= (__WORDSIZE - 23);
-#elif __WORDSIZE == 64
- stk <<= 31;
-#endif
- ret ^= stk;
- /* Avoid GCC being too smart. */
- p = (unsigned char *) &errno;
- asm ("" : "=r" (stk) : "r" (p));
- stk &= 0x7fff00;
-#if __BYTE_ORDER == __LITTLE_ENDIAN
- stk <<= (__WORDSIZE - 29);
-#else
- stk >>= 8;
-#endif
- ret ^= stk;
- return ret;
-}
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