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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/2] 32bit gdbserver-xen/libxc to debug 64bit guest
part 1 : files changed in gdbserver xen-sparse tree. diff -uNpr
xen-3.1.1-ovs.orig/tools/debugger/gdb/gdb-6.2.1-xen-sparse/gdb/gdbserver/linux-xen-low.c
xen-3.1.1-ovs.new/tools/debugger/gdb/gdb-6.2.1-xen-sparse/gdb/gdbserver/linux-xen-low.c
---
xen-3.1.1-ovs.orig/tools/debugger/gdb/gdb-6.2.1-xen-sparse/gdb/gdbserver/linux-xen-low.c
2007-09-12 17:43:17.000000000 -0700
+++
xen-3.1.1-ovs.new/tools/debugger/gdb/gdb-6.2.1-xen-sparse/gdb/gdbserver/linux-xen-low.c
2007-10-31 16:52:29.291343000 -0700
@@ -22,6 +22,10 @@
#include "server.h"
#include "linux-low.h"
+#ifdef _GDB_CROSS_COMP
+#include "user.h"
+#endif
+
#include <sys/wait.h>
#include <stdio.h>
#include <sys/param.h>
@@ -69,8 +73,13 @@ struct pending_signals
struct pending_signals *prev;
};
-#define PTRACE_ARG3_TYPE long
-#define PTRACE_XFER_TYPE long
+#ifdef _GDB_CROSS_COMP
+#define PTRACE_ARG3_TYPE unsigned long long
+#define PTRACE_XFER_TYPE unsigned long long
+#else
+#define PTRACE_ARG3_TYPE unsigned long
+#define PTRACE_XFER_TYPE unsigned long
+#endif
static int use_regsets_p = 1;
@@ -157,7 +166,8 @@ linux_attach (int domid)
add_thread (0, new_process);
new_process->stop_expected = 0;
- if (xc_ptrace (xc_handle, PTRACE_ATTACH, domid, 0, isfile) != 0) {
+ if (xc_ptrace(xc_handle, PTRACE_ATTACH, domid, 0,(PTRACE_XFER_TYPE)isfile))
+ {
fprintf (stderr, "Cannot attach to domain %d: %s (%d)\n", domid,
strerror (errno), errno);
fflush (stderr);
@@ -261,8 +271,7 @@ regsets_fetch_inferior_registers ()
buf = malloc (regset->size);
res = xc_ptrace (xc_handle, regset->get_request,
- curvcpuid(),
- 0, (PTRACE_XFER_TYPE)buf);
+ curvcpuid(), 0, (PTRACE_XFER_TYPE)buf);
if (res < 0)
{
if (errno == EIO)
@@ -314,7 +323,8 @@ regsets_store_inferior_registers ()
buf = malloc (regset->size);
regset->fill_function (buf);
- res = xc_ptrace (xc_handle, regset->set_request, curvcpuid(), 0,
(PTRACE_XFER_TYPE)buf);
+ res = xc_ptrace (xc_handle, regset->set_request, curvcpuid(),
+ 0, (PTRACE_XFER_TYPE)buf);
if (res < 0)
{
if (errno == EIO)
@@ -392,7 +402,8 @@ linux_read_memory (CORE_ADDR memaddr, ch
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
- buffer[i] = xc_ptrace (xc_handle, PTRACE_PEEKTEXT, curvcpuid(),
(PTRACE_ARG3_TYPE) addr, 0);
+ buffer[i] = xc_ptrace (xc_handle, PTRACE_PEEKTEXT, curvcpuid(),
+ (PTRACE_ARG3_TYPE)addr, 0);
if (errno)
return errno;
}
@@ -418,7 +429,7 @@ linux_write_memory (CORE_ADDR memaddr, c
register int count
= (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof
(PTRACE_XFER_TYPE);
/* Allocate buffer of that many longwords. */
- register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count *
sizeof (PTRACE_XFER_TYPE));
+ register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE*)alloca(count *
sizeof(PTRACE_XFER_TYPE));
extern int errno;
TRACE_ENTER;
@@ -426,15 +437,13 @@ linux_write_memory (CORE_ADDR memaddr, c
/* Fill start and end extra bytes of buffer with existing memory data. */
buffer[0] = xc_ptrace (xc_handle, PTRACE_PEEKTEXT, curvcpuid(),
- (PTRACE_ARG3_TYPE) addr, 0);
+ (PTRACE_ARG3_TYPE)addr, 0);
if (count > 1)
{
buffer[count - 1]
= xc_ptrace (xc_handle, PTRACE_PEEKTEXT, curvcpuid(),
- (PTRACE_ARG3_TYPE) (addr + (count - 1)
- * sizeof (PTRACE_XFER_TYPE)),
- 0);
+ (PTRACE_ARG3_TYPE)(addr + (count - 1) *
sizeof(PTRACE_ARG3_TYPE)), 0);
}
/* Copy data to be written over corresponding part of buffer */
@@ -446,7 +455,7 @@ linux_write_memory (CORE_ADDR memaddr, c
{
errno = 0;
xc_ptrace (xc_handle, PTRACE_POKETEXT, curvcpuid(),
- (PTRACE_ARG3_TYPE) addr, buffer[i]);
+ (PTRACE_ARG3_TYPE) addr, buffer[i]);
if (errno)
return errno;
}
diff -uNpr
xen-3.1.1-ovs.orig/tools/debugger/gdb/gdb-6.2.1-xen-sparse/gdb/gdbserver/Makefile.in
xen-3.1.1-ovs.new/tools/debugger/gdb/gdb-6.2.1-xen-sparse/gdb/gdbserver/Makefile.in
---
xen-3.1.1-ovs.orig/tools/debugger/gdb/gdb-6.2.1-xen-sparse/gdb/gdbserver/Makefile.in
2007-09-12 17:43:17.000000000 -0700
+++
xen-3.1.1-ovs.new/tools/debugger/gdb/gdb-6.2.1-xen-sparse/gdb/gdbserver/Makefile.in
2007-10-31 16:52:29.286344000 -0700
@@ -135,6 +135,14 @@ OBS = inferiors.o regcache.o remote-util
$(DEPFILES)
GDBSERVER_LIBS = @GDBSERVER_LIBS@
+# if cross compiling to get a 32binary on a 64bit system, we statically link
+# the xenctrl lib, so as not to break anything
+ifneq "$(findstring _GDB_CROSS_COMP, $(CFLAGS))" ""
+ STATIC_LNK=-Wl,-Bstatic
+ STATIC_UNLNK=-Wl,-Bdynamic
+endif
+
+
# Prevent Sun make from putting in the machine type. Setting
# TARGET_ARCH to nothing works for SunOS 3, 4.0, but not for 4.1.
.c.o:
@@ -172,7 +180,7 @@ clean-info:
gdbserver-xen: $(OBS) ${ADD_DEPS} ${CDEPS}
rm -f gdbserver-xen
${CC-LD} $(GLOBAL_CFLAGS) $(LDFLAGS) -o gdbserver-xen $(OBS) \
- $(GDBSERVER_LIBS) $(XM_CLIBS)
+ $(STATIC_LNK) $(GDBSERVER_LIBS) $(STATIC_UNLNK) $(XM_CLIBS)
gdbreplay: gdbreplay.o
rm -f gdbreplay
diff -uNpr
xen-3.1.1-ovs.orig/tools/debugger/gdb/gdb-6.2.1-xen-sparse/mkbuildtree
xen-3.1.1-ovs.new/tools/debugger/gdb/gdb-6.2.1-xen-sparse/mkbuildtree
--- xen-3.1.1-ovs.orig/tools/debugger/gdb/gdb-6.2.1-xen-sparse/mkbuildtree
2007-09-12 17:43:17.000000000 -0700
+++ xen-3.1.1-ovs.new/tools/debugger/gdb/gdb-6.2.1-xen-sparse/mkbuildtree
2007-10-31 16:52:29.330342000 -0700
@@ -66,7 +66,7 @@ relative_lndir ()
(
cd $i
pref=`echo $i | sed -e 's#/[^/]*#../#g' -e 's#^\.##'`
- for j in `find . -type f -o -type l -maxdepth 1`; do
+ for j in `find . -maxdepth 1 -type f -o -type l`; do
ln -sf ${pref}${REAL_DIR}/$i/$j ${SYMLINK_DIR}/$i/$j
done
)
diff -uNpr xen-3.1.1-ovs.orig/tools/debugger/gdb/gdbbuild
xen-3.1.1-ovs.new/tools/debugger/gdb/gdbbuild
--- xen-3.1.1-ovs.orig/tools/debugger/gdb/gdbbuild 2007-09-12
17:43:17.000000000 -0700
+++ xen-3.1.1-ovs.new/tools/debugger/gdb/gdbbuild 2007-10-31
16:52:29.334344000 -0700
@@ -22,7 +22,14 @@ cd gdb-$GDB_VERSION-linux-i386-xen
if [ "$MAKE" ]; then
$MAKE
elif which gmake ; then
- gmake -j4
+ MAKE="gmake -j4"
else
- make -j4
+ MAKE="make -j4"
+fi
+
+if [[ $1 == _GDB_CROSS_COMP ]]
+then
+ $MAKE CFLAGS="-m32 -D_GDB_CROSS_COMP -D __x86_64__" LDFLAGS="-m32"
+else
+ $MAKE
fi
diff -uNpr xen-3.1.1-ovs.orig/tools/debugger/gdb/README
xen-3.1.1-ovs.new/tools/debugger/gdb/README
--- xen-3.1.1-ovs.orig/tools/debugger/gdb/README 2007-09-12
17:43:17.000000000 -0700
+++ xen-3.1.1-ovs.new/tools/debugger/gdb/README 2007-11-01 17:41:37.059119000
-0700
@@ -5,11 +5,37 @@ DomU & HVM GDB server for 32-bit (PAE an
Lines marked below with [*] are optional, if you want full
source-level debugging of your kernel image.
-To build the GDB server:
- 0. Build rest of the Xen first from the base directory
- 1. Run ./gdbbuild from within this directory.
- 2. Copy ./gdb-6.2.1-linux-i386-xen/gdb/gdbserver/gdbserver-xen
- to your test machine.
+gdbserver can run on 32bit or 64bit dom0. It can attach to a 32 bit non-PAE,
+a 32bit PAE, or an x86_64 guest:
+
+ 32 non-PAE 32 PAE x86_64
+32 dom0: Y Y Y
+64 dom0: ? ? Y
+
+
+TO BUILD: Involves two steps, building libxc and gdbserver-xen. After building,
+ copy gdbserver-xen, and possibly libxc to dom0:
+
+32 non-PAE (build on 32bit box) or x86_64 (build on x86_64 box) :
+ 1. Build libxc first by running >make
+ 2. Build gdbserver-xen by running >gdbbuild
+ 3. copy ./gdb-6.2.1-linux-i386-xen/gdb/gdbserver/gdbserver-xen to dom0
+
+32 PAE (build on 32bit box) :
+ 1. Build libxc first by running
+ >CFLAGS="-D_CROSS_COMP_PAE" make
+ 2. Build gdbserver-xen by running
+ >gdbbuild
+ 3. copy gdbserver-xen and libxenctrl.so.3.0.0 to dom0
+
+x86_64 (build on x86_64 box to run on 32 domU) :
+ 1. Build libxc first by running
+ >CFLAGS="-m32 -D_GDB_CROSS_COMP" make
+ 2. Build gdbserver-xen by running
+ >gdbbuild _GDB_CROSS_COMP
+ 3. copy gdbserver-xen to dom0 (libxenctrl is statically linked in this
case)
+
+
To build a debuggable guest domU kernel image:
1. cd linux-2.6.xx-xenU
@@ -28,6 +54,8 @@ To debug a running guest:
# target remote 127.0.0.1:9999
# bt
# disass
+ 5. gdb could be running on a different host, in which case:
+ # target remote 127.11.11.11:9999 where 127.11.11.11 is the xen host.
To debug a crashed domU guest:
1. Add '(enable-dump yes)' to /etc/xen/xend-config.sxp before
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