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-rw-r--r--libc/sysdeps/linux/sh/crtreloc.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sh/crtreloc.c b/libc/sysdeps/linux/sh/crtreloc.c
new file mode 100644
index 000000000..01fde6fc3
--- /dev/null
+++ b/libc/sysdeps/linux/sh/crtreloc.c
@@ -0,0 +1,141 @@
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+ written by Alexandre Oliva <aoliva@redhat.com>
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public License as
+published by the Free Software Foundation; either version 2.1 of the
+License, or (at your option) any later version.
+
+In addition to the permissions in the GNU Lesser General Public
+License, the Free Software Foundation gives you unlimited
+permission to link the compiled version of this file with other
+programs, and to distribute those programs without any restriction
+coming from the use of this file. (The GNU Lesser General Public
+License restrictions do apply in other respects; for example, they
+cover modification of the file, and distribution when not linked
+into another program.)
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <sys/types.h>
+#include <link.h>
+
+#ifdef __LITTLE_ENDIAN__
+#define BYTE(n) (n)
+#else
+#define BYTE(n) (3-(n))
+#endif
+
+/* This file is to be compiled into crt object files, to enable
+ executables to easily self-relocate. */
+
+static __always_inline int
+unaligned_read (int *src)
+{
+ unsigned char *bytes = (unsigned char *)src;
+
+ return (bytes[BYTE(0)]
+ | (bytes[BYTE(1)] << 8)
+ | (bytes[BYTE(2)] << 16)
+ | (bytes[BYTE(3)] << 24));
+}
+
+static __always_inline void
+unaligned_write (int *dest, int val)
+{
+ char *bytes = (char *)dest;
+
+ bytes[BYTE(0)] = val & 0xff;
+ bytes[BYTE(1)] = (val >> 8) & 0xff;
+ bytes[BYTE(2)] = (val >> 16) & 0xff;
+ bytes[BYTE(3)] = (val >> 24) & 0xff;
+}
+
+/* Compute the runtime address of pointer in the range [p,e), and then
+ map the pointer pointed by it. */
+static __always_inline void ***
+reloc_range_indirect (void ***p, void ***e,
+ const struct elf32_fdpic_loadmap *map)
+{
+ while (p < e)
+ {
+ void *ptr = __reloc_pointer (*p, map);
+ if (ptr)
+ {
+ void *pt = (void *)unaligned_read (ptr);
+ pt = __reloc_pointer (pt, map);
+ unaligned_write (ptr, (int)pt);
+ }
+ p++;
+ }
+ return p;
+}
+
+/* Call __reloc_range_indirect for the given range except for the last
+ entry, whose contents are only relocated. It's expected to hold
+ the GOT value. */
+void* attribute_hidden
+__self_reloc (const struct elf32_fdpic_loadmap *map,
+ void ***p, void ***e)
+{
+ p = reloc_range_indirect (p, e-1, map);
+
+ if (p >= e)
+ return (void*)-1;
+
+ return __reloc_pointer (*p, map);
+}
+
+#if 0
+/* These are other functions that might be useful, but that we don't
+ need. */
+
+/* Remap pointers in [p,e). */
+static __always_inline void**
+reloc_range (void **p, void **e,
+ const struct elf32_fdpic_loadmap *map)
+{
+ while (p < e)
+ {
+ *p = __reloc_pointer (*p, map);
+ p++;
+ }
+ return p;
+}
+
+/* Remap p, adjust e by the same offset, then map the pointers in the
+ range determined by them. */
+void attribute_hidden
+__reloc_range (const struct elf32_fdpic_loadmap *map,
+ void **p, void **e)
+{
+ void **old = p;
+
+ p = __reloc_pointer (p, map);
+ e += p - old;
+ reloc_range (p, e, map);
+}
+
+/* Remap p, adjust e by the same offset, then map pointers referenced
+ by the (unadjusted) pointers in the range. Return the relocated
+ value of the last pointer in the range. */
+void* attribute_hidden
+__reloc_range_indirect (const struct elf32_fdpic_loadmap *map,
+ void ***p, void ***e)
+{
+ void ***old = p;
+
+ p = __reloc_pointer (p, map);
+ e += p - old;
+ return reloc_range_indirect (p, e, map);
+}
+#endif