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-rw-r--r--newlib/libc/sys/linux/dl/dl-misc.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/dl/dl-misc.c b/newlib/libc/sys/linux/dl/dl-misc.c
new file mode 100644
index 0000000..1a4c297
--- /dev/null
+++ b/newlib/libc/sys/linux/dl/dl-misc.c
@@ -0,0 +1,277 @@
+/* Miscellaneous support functions for dynamic linker
+ Copyright (C) 1997, 1998, 1999, 2000, 2001 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
+ 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.
+
+ 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
+ Lesser 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; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <assert.h>
+#include <fcntl.h>
+#include <ldsodefs.h>
+#include <limits.h>
+#include <link.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/uio.h>
+
+#ifndef MAP_ANON
+/* This is the only dl-sysdep.c function that is actually needed at run-time
+ by _dl_map_object. */
+
+int
+_dl_sysdep_open_zero_fill (void)
+{
+ return __open ("/dev/zero", O_RDONLY);
+}
+#endif
+
+/* Read the whole contents of FILE into new mmap'd space with given
+ protections. *SIZEP gets the size of the file. On error MAP_FAILED
+ is returned. */
+
+void *
+internal_function
+_dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
+{
+ void *result = MAP_FAILED;
+ struct stat64 st;
+ int fd = __open (file, O_RDONLY);
+ if (fd >= 0)
+ {
+ if (fstat64 (fd, &st) >= 0)
+ {
+ *sizep = st.st_size;
+
+ /* No need to map the file if it is empty. */
+ if (*sizep != 0)
+ /* Map a copy of the file contents. */
+ result = mmap (NULL, *sizep, prot,
+#ifdef MAP_COPY
+ MAP_COPY
+#else
+ MAP_PRIVATE
+#endif
+#ifdef MAP_FILE
+ | MAP_FILE
+#endif
+ , fd, 0);
+ }
+ close (fd);
+ }
+ return result;
+}
+
+
+/* Descriptor to write debug messages to. */
+int _dl_debug_fd = 2;
+
+
+/* Bare-bone printf implementation. This function only knows about
+ the formats and flags needed and can handle only up to 64 stripes in
+ the output. */
+static void
+_dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg)
+{
+ const int niovmax = 64;
+ struct iovec iov[niovmax];
+ int niov = 0;
+ pid_t pid = 0;
+ char pidbuf[7];
+
+ while (*fmt != '\0')
+ {
+ const char *startp = fmt;
+
+ if (tag_p > 0)
+ {
+ /* Generate the tag line once. It consists of the PID and a
+ colon followed by a tab. */
+ if (pid == 0)
+ {
+ char *p = "0";
+ pid = __getpid ();
+ assert (pid >= 0 && pid < 100000);
+ while (p > pidbuf)
+ *--p = '0';
+ pidbuf[5] = ':';
+ pidbuf[6] = '\t';
+ }
+
+ /* Append to the output. */
+ assert (niov < niovmax);
+ iov[niov].iov_len = 7;
+ iov[niov++].iov_base = pidbuf;
+
+ /* No more tags until we see the next newline. */
+ tag_p = -1;
+ }
+
+ /* Skip everything except % and \n (if tags are needed). */
+ while (*fmt != '\0' && *fmt != '%' && (! tag_p || *fmt != '\n'))
+ ++fmt;
+
+ /* Append constant string. */
+ assert (niov < niovmax);
+ if ((iov[niov].iov_len = fmt - startp) != 0)
+ iov[niov++].iov_base = (char *) startp;
+
+ if (*fmt == '%')
+ {
+ /* It is a format specifier. */
+ char fill = ' ';
+ int width = -1;
+#if LONG_MAX != INT_MAX
+ int long_mod = 0;
+#endif
+
+ /* Recognize zero-digit fill flag. */
+ if (*++fmt == '0')
+ {
+ fill = '0';
+ ++fmt;
+ }
+
+ /* See whether with comes from a parameter. Note that no other
+ way to specify the width is implemented. */
+ if (*fmt == '*')
+ {
+ width = va_arg (arg, int);
+ ++fmt;
+ }
+
+ /* Recognize the l modifier. It is only important on some
+ platforms where long and int have a different size. We
+ can use the same code for size_t. */
+ if (*fmt == 'l' || *fmt == 'Z')
+ {
+#if LONG_MAX != INT_MAX
+ long_mod = 1;
+#endif
+ ++fmt;
+ }
+
+ switch (*fmt)
+ {
+ /* Integer formatting. */
+ case 'u':
+ case 'x':
+ {
+ /* We have to make a difference if long and int have a
+ different size. */
+#if LONG_MAX != INT_MAX
+ unsigned long int num = (long_mod
+ ? va_arg (arg, unsigned long int)
+ : va_arg (arg, unsigned int));
+#else
+ unsigned long int num = va_arg (arg, unsigned int);
+#endif
+ /* We use alloca() to allocate the buffer with the most
+ pessimistic guess for the size. Using alloca() allows
+ having more than one integer formatting in a call. */
+ char *buf = (char *) alloca (3 * sizeof (unsigned long int));
+ char *endp = &buf[3 * sizeof (unsigned long int)];
+ char *cp = "0";
+
+ /* Pad to the width the user specified. */
+ if (width != -1)
+ while (endp - cp < width)
+ *--cp = fill;
+
+ iov[niov].iov_base = cp;
+ iov[niov].iov_len = endp - cp;
+ ++niov;
+ }
+ break;
+
+ case 's':
+ /* Get the string argument. */
+ iov[niov].iov_base = va_arg (arg, char *);
+ iov[niov].iov_len = strlen (iov[niov].iov_base);
+ ++niov;
+ break;
+
+ case '%':
+ iov[niov].iov_base = (void *) fmt;
+ iov[niov].iov_len = 1;
+ ++niov;
+ break;
+
+ default:
+ assert (! "invalid format specifier");
+ }
+ ++fmt;
+ }
+ else if (*fmt == '\n')
+ {
+ /* See whether we have to print a single newline character. */
+ if (fmt == startp)
+ {
+ iov[niov].iov_base = (char *) startp;
+ iov[niov++].iov_len = 1;
+ }
+ else
+ /* No, just add it to the rest of the string. */
+ ++iov[niov - 1].iov_len;
+
+ /* Next line, print a tag again. */
+ tag_p = 1;
+ ++fmt;
+ }
+ }
+
+ /* Finally write the result. */
+ writev (fd, iov, niov);
+}
+
+
+/* Write to debug file. */
+void
+_dl_debug_printf (const char *fmt, ...)
+{
+ va_list arg;
+
+ va_start (arg, fmt);
+ _dl_debug_vdprintf (_dl_debug_fd, 1, fmt, arg);
+ va_end (arg);
+}
+
+
+/* Write to debug file but don't start with a tag. */
+void
+_dl_debug_printf_c (const char *fmt, ...)
+{
+ va_list arg;
+
+ va_start (arg, fmt);
+ _dl_debug_vdprintf (_dl_debug_fd, -1, fmt, arg);
+ va_end (arg);
+}
+
+
+/* Write the given file descriptor. */
+void
+_dl_dprintf (int fd, const char *fmt, ...)
+{
+ va_list arg;
+
+ va_start (arg, fmt);
+ _dl_debug_vdprintf (fd, 0, fmt, arg);
+ va_end (arg);
+}