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authorDaniel Jacobowitz <drow@false.org>2007-09-19 14:41:50 +0000
committerDaniel Jacobowitz <drow@false.org>2007-09-19 14:41:50 +0000
commitfd462a61890aa2795a14d98339a4094f97ea7bdb (patch)
treeef49eac40e47dd40c6ce351e2021c97462ef43d2
parenta69898aad0d92d44881d16b6d5d835c3af53b9c1 (diff)
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* linux-low.c (O_LARGEFILE): Define.
(linux_read_memory): Use /proc/PID/mem. * configure.ac: Use AC_GNU_SOURCE. Check for pread64. * configure, config.in: Regenerated.
-rw-r--r--gdb/gdbserver/ChangeLog7
-rw-r--r--gdb/gdbserver/config.in8
-rwxr-xr-xgdb/gdbserver/configure108
-rw-r--r--gdb/gdbserver/configure.ac2
-rw-r--r--gdb/gdbserver/linux-low.c35
5 files changed, 160 insertions, 0 deletions
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 13bb16c..c56f22f 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,10 @@
+2007-09-19 Daniel Jacobowitz <dan@codesourcery.com>
+
+ * linux-low.c (O_LARGEFILE): Define.
+ (linux_read_memory): Use /proc/PID/mem.
+ * configure.ac: Use AC_GNU_SOURCE. Check for pread64.
+ * configure, config.in: Regenerated.
+
2007-09-04 Daniel Jacobowitz <dan@codesourcery.com>
* linux-low.c (linux_wait_for_event): Do not pass signals while
diff --git a/gdb/gdbserver/config.in b/gdb/gdbserver/config.in
index 675a50c..017a1ed 100644
--- a/gdb/gdbserver/config.in
+++ b/gdb/gdbserver/config.in
@@ -53,6 +53,9 @@
/* Define to 1 if you have the <netinet/tcp.h> header file. */
#undef HAVE_NETINET_TCP_H
+/* Define to 1 if you have the `pread64' function. */
+#undef HAVE_PREAD64
+
/* Define if <sys/procfs.h> has prgregset_t. */
#undef HAVE_PRGREGSET_T
@@ -160,3 +163,8 @@
/* Define if an XML target description is available. */
#undef USE_XML
+
+/* Enable GNU extensions on systems that have them. */
+#ifndef _GNU_SOURCE
+# undef _GNU_SOURCE
+#endif
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index b6834c1..a283dcf 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -2228,6 +2228,12 @@ ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $
ac_compiler_gnu=$ac_cv_c_compiler_gnu
+cat >>confdefs.h <<\_ACEOF
+#define _GNU_SOURCE 1
+_ACEOF
+
+
+
ac_aux_dir=
for ac_dir in $srcdir $srcdir/.. $srcdir/../..; do
if test -f $ac_dir/install-sh; then
@@ -3093,6 +3099,108 @@ fi
done
+for ac_func in pread64
+do
+as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
+echo "$as_me:$LINENO: checking for $ac_func" >&5
+echo $ECHO_N "checking for $ac_func... $ECHO_C" >&6
+if eval "test \"\${$as_ac_var+set}\" = set"; then
+ echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+ cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h. */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h. */
+/* Define $ac_func to an innocuous variant, in case <limits.h> declares $ac_func.
+ For example, HP-UX 11i <limits.h> declares gettimeofday. */
+#define $ac_func innocuous_$ac_func
+
+/* System header to define __stub macros and hopefully few prototypes,
+ which can conflict with char $ac_func (); below.
+ Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+ <limits.h> exists even on freestanding compilers. */
+
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+
+#undef $ac_func
+
+/* Override any gcc2 internal prototype to avoid an error. */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+/* We use char because int might match the return type of a gcc2
+ builtin and then its argument prototype would still apply. */
+char $ac_func ();
+/* The GNU C library defines this for functions which it implements
+ to always fail with ENOSYS. Some functions are actually named
+ something starting with __ and the normal name is an alias. */
+#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
+choke me
+#else
+char (*f) () = $ac_func;
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+int
+main ()
+{
+return f != $ac_func;
+ ;
+ return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+ (eval $ac_link) 2>conftest.er1
+ ac_status=$?
+ grep -v '^ *+' conftest.er1 >conftest.err
+ rm -f conftest.er1
+ cat conftest.err >&5
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); } &&
+ { ac_try='test -z "$ac_c_werror_flag"
+ || test ! -s conftest.err'
+ { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); }; } &&
+ { ac_try='test -s conftest$ac_exeext'
+ { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); }; }; then
+ eval "$as_ac_var=yes"
+else
+ echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+eval "$as_ac_var=no"
+fi
+rm -f conftest.err conftest.$ac_objext \
+ conftest$ac_exeext conftest.$ac_ext
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_var'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_var'}'`" >&6
+if test `eval echo '${'$as_ac_var'}'` = yes; then
+ cat >>confdefs.h <<_ACEOF
+#define `echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+done
+
+
have_errno=no
echo "$as_me:$LINENO: checking for errno" >&5
echo $ECHO_N "checking for errno... $ECHO_C" >&6
diff --git a/gdb/gdbserver/configure.ac b/gdb/gdbserver/configure.ac
index 8007e14..de996ba8 100644
--- a/gdb/gdbserver/configure.ac
+++ b/gdb/gdbserver/configure.ac
@@ -25,6 +25,7 @@ AC_INIT(server.c)
AC_CONFIG_HEADER(config.h:config.in)
AC_PROG_CC
+AC_GNU_SOURCE
AC_CANONICAL_SYSTEM
@@ -40,6 +41,7 @@ AC_CHECK_HEADERS(sgtty.h termio.h termios.h sys/reg.h string.h dnl
errno.h fcntl.h signal.h sys/file.h malloc.h dnl
sys/ioctl.h netinet/in.h sys/socket.h netdb.h dnl
netinet/tcp.h arpa/inet.h sys/wait.h)
+AC_CHECK_FUNCS(pread64)
have_errno=no
AC_MSG_CHECKING(for errno)
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index aaa09ef..fa5c5b2 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -40,6 +40,10 @@
# define PTRACE_SETSIGINFO 0x4203
#endif
+#ifndef O_LARGEFILE
+#define O_LARGEFILE 0
+#endif
+
#ifdef __UCLIBC__
#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
#define HAS_NOMMU
@@ -1488,7 +1492,38 @@ linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
/* Allocate buffer of that many longwords. */
register PTRACE_XFER_TYPE *buffer
= (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+ int fd;
+ char filename[64];
+
+ /* Try using /proc. Don't bother for one word. */
+ if (len >= 3 * sizeof (long))
+ {
+ /* We could keep this file open and cache it - possibly one per
+ thread. That requires some juggling, but is even faster. */
+ sprintf (filename, "/proc/%ld/mem", inferior_pid);
+ fd = open (filename, O_RDONLY | O_LARGEFILE);
+ if (fd == -1)
+ goto no_proc;
+
+ /* If pread64 is available, use it. It's faster if the kernel
+ supports it (only one syscall), and it's 64-bit safe even on
+ 32-bit platforms (for instance, SPARC debugging a SPARC64
+ application). */
+#ifdef HAVE_PREAD64
+ if (pread64 (fd, myaddr, len, memaddr) != len)
+#else
+ if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len)
+#endif
+ {
+ close (fd);
+ goto no_proc;
+ }
+
+ close (fd);
+ return 0;
+ }
+ no_proc:
/* Read all the longwords */
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
{