c51edd3fdb
git-svn-id: https://svn.o-hand.com/repos/poky/trunk@2659 311d38ba-8fff-0310-9ca6-ca027cbcb966
126 lines
4.7 KiB
Diff
126 lines
4.7 KiB
Diff
# The 2.6 asm/stat.h for ARM has some rather unusual transmogrifications
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# for big-endian running. This patch adds ARM specific code in xstatconv.c
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# which deals with the 2.4->2.6 ABI change.
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--- uClibc-0.9.27/libc/sysdeps/linux/common/xstatconv.c 2005-01-11 23:59:21.000000000 -0800
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+++ uClibc-0.9.27/libc/sysdeps/linux/common/xstatconv.c 2005-06-05 11:03:56.742587966 -0700
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@@ -18,7 +18,14 @@
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02111-1307 USA.
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Modified for uClibc by Erik Andersen <andersen@codepoet.org>
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+ Further modified for ARMBE by John Bowler <jbowler@acm.org>
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*/
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+/* This is a copy of common/xstatconv.c with a fixup for the ABI
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+ * (structure layout) change in ARM Linux 2.6 - this shifts the
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+ * st_dev and st_rdev information from the start of the 8 byte
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+ * space to the end on big-endian ARM (only). The code is unchanged
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+ * on little endian.
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+ */
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#define _GNU_SOURCE
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#define _LARGEFILE64_SOURCE
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@@ -32,6 +39,84 @@
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#include <sys/stat.h>
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#include "xstatconv.h"
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+/* Only for ARMEB and LFS. */
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+#if defined(__ARMEB__) && defined(__UCLIBC_HAS_LFS__)
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+/* stat64 (renamed) from 2.6.11.11. What happened here is that after
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+ * Linux 2.4 the 2.4 unsigned short st_rdev and st_dev fields were
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+ * lengthened to unsigned long long - causing the inclusion of at least
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+ * some of the 0 padding bytes which followed them. On little endian
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+ * this is fine because 2.4 did zero the pad bytes (I think) and the
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+ * position of the data did not change. On big endian the change
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+ * shifted the data to the end of the field. Someone noticed for the
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+ * struct stat, and the armeb (big endian) case preserved the
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+ * unsigned short (yuck), but no so for stat64 (maybe this was deliberate,
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+ * but there is no evidence in the code of this.) Consequently a
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+ * fixup is necessary for the stat64 case. The fixup here is to
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+ * use the new structure when the change is detected. See below.
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+ */
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+struct __kernel_stat64_armeb {
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+ /* This definition changes the layout on big-endian from that
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+ * used in 2.4.31 - ABI change! Likewise for st_rdev.
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+ */
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+ unsigned long long st_dev;
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+ unsigned char __pad0[4];
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+ unsigned long __st_ino;
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+ unsigned int st_mode;
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+ unsigned int st_nlink;
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+ unsigned long st_uid;
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+ unsigned long st_gid;
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+ unsigned long long st_rdev;
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+ unsigned char __pad3[4];
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+ long long st_size;
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+ unsigned long st_blksize;
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+ unsigned long __pad4;
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+ unsigned long st_blocks;
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+ unsigned long st_atime;
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+ unsigned long st_atime_nsec;
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+ unsigned long st_mtime;
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+ unsigned long st_mtime_nsec;
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+ unsigned long st_ctime;
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+ unsigned long st_ctime_nsec;
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+ unsigned long long st_ino;
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+};
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+
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+/* This fixup only works so long as the old struct stat64 is no
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+ * smaller than the new one - the caller of xstatconv uses the
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+ * *old* struct, but the kernel writes the new one. CASSERT
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+ * detects this at compile time.
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+ */
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+#define CASSERT(c) do switch (0) { case 0:; case (c):; } while (0)
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+
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+void __xstat64_conv_new(struct __kernel_stat64_armeb *kbuf, struct stat64 *buf)
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+{
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+ CASSERT(sizeof *kbuf <= sizeof (struct kernel_stat64));
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+
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+ /* Convert from new kernel version of `struct stat64'. */
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+ buf->st_dev = kbuf->st_dev;
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+ buf->st_ino = kbuf->st_ino;
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+#ifdef _HAVE_STAT64___ST_INO
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+ buf->__st_ino = kbuf->__st_ino;
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+#endif
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+ buf->st_mode = kbuf->st_mode;
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+ buf->st_nlink = kbuf->st_nlink;
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+ buf->st_uid = kbuf->st_uid;
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+ buf->st_gid = kbuf->st_gid;
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+ buf->st_rdev = kbuf->st_rdev;
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+ buf->st_size = kbuf->st_size;
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+ buf->st_blksize = kbuf->st_blksize;
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+ buf->st_blocks = kbuf->st_blocks;
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+ buf->st_atime = kbuf->st_atime;
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+ buf->st_mtime = kbuf->st_mtime;
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+ buf->st_ctime = kbuf->st_ctime;
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+}
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+#define _MAY_HAVE_NEW_STAT64 1
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+#else
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+#define _MAY_HAVE_NEW_STAT64 0
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+#endif
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+
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+/* The following is taken verbatim from xstatconv.c apart from
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+ * the addition of the _MAY_HAVE_NEW_STAT64 code.
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+ */
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void __xstat_conv(struct kernel_stat *kbuf, struct stat *buf)
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{
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/* Convert to current kernel version of `struct stat'. */
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@@ -53,6 +138,19 @@
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#if defined __UCLIBC_HAS_LFS__
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void __xstat64_conv(struct kernel_stat64 *kbuf, struct stat64 *buf)
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{
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+# if _MAY_HAVE_NEW_STAT64
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+ /* This relies on any device (0,0) not being mountable - i.e.
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+ * it fails on Linux 2.4 if dev(0,0) is a mountable block file
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+ * system and itself contains it's own device. That doesn't
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+ * happen on Linux 2.4 so far as I can see, but even if it
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+ * does the API only fails (even then) if 2.4 didn't set all
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+ * of the pad bytes to 0 (and it does set them to zero.)
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+ */
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+ if (kbuf->st_dev == 0 && kbuf->st_rdev == 0) {
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+ __xstat64_conv_new((struct __kernel_stat64_armeb*)kbuf, buf);
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+ return;
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+ }
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+# endif
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/* Convert to current kernel version of `struct stat64'. */
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buf->st_dev = kbuf->st_dev;
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buf->st_ino = kbuf->st_ino;
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