Patchwork [PATCH/commit] Fix regression caused by recently added syscall restart code

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Submitter Kevin Buettner
Date May 6, 2019, 6:03 p.m.
Message ID <20190506180323.11760-1-kevinb@redhat.com>
Download mbox | patch
Permalink /patch/32572/
State New
Headers show

Comments

Kevin Buettner - May 6, 2019, 6:03 p.m.
This line of code...

       *(int64_t *) ptr = *(int32_t *) ptr;

...in linux-x86-low.c is not needed (and does not work correctly)
within a 32-bit executable.  I added an __x86_64__ ifdef (which is
used extensively elsewhere in the file for like purposes) to prevent
this code from being included in 32-bit builds.

It fixes the following regressions when running on native
i686-pc-linux-gnu:

FAIL: gdb.server/abspath.exp: continue to main
FAIL: gdb.server/connect-without-multi-process.exp: multiprocess=auto: continue to main
FAIL: gdb.server/connect-without-multi-process.exp: multiprocess=off: continue to main
FAIL: gdb.server/ext-restart.exp: restart: run to main
FAIL: gdb.server/ext-restart.exp: run to main
FAIL: gdb.server/ext-run.exp: continue to main
FAIL: gdb.server/ext-wrapper.exp: print d
FAIL: gdb.server/ext-wrapper.exp: restart: print d
FAIL: gdb.server/ext-wrapper.exp: restart: run to marker
FAIL: gdb.server/ext-wrapper.exp: run to marker
FAIL: gdb.server/no-thread-db.exp: continue to breakpoint: after tls assignment
FAIL: gdb.server/reconnect-ctrl-c.exp: first: stop with control-c
FAIL: gdb.server/reconnect-ctrl-c.exp: second: stop with control-c
FAIL: gdb.server/run-without-local-binary.exp: run test program until the end
FAIL: gdb.server/server-kill.exp: continue to breakpoint: after server_pid assignment
FAIL: gdb.server/server-kill.exp: tstatus
FAIL: gdb.server/server-run.exp: continue to main

gdb/gdbserver/ChangeLog:

	* linux-x86-low.c (x86_fill_gregset): Don't compile 64-bit
	sign extension code on 32-bit builds.
---
 gdb/gdbserver/ChangeLog       | 5 +++++
 gdb/gdbserver/linux-x86-low.c | 2 ++
 2 files changed, 7 insertions(+)

Patch

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 82278e7bb2..2e98158aa6 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,8 @@ 
+2019-05-06  Kevin Buettner  <kevinb@redhat.com>
+
+	* linux-x86-low.c (x86_fill_gregset): Don't compile 64-bit
+	sign extension code on 32-bit builds.
+
 2019-05-03  Eli Zaretskii  <eliz@gnu.org>
 
 	* remote-utils.c:
diff --git a/gdb/gdbserver/linux-x86-low.c b/gdb/gdbserver/linux-x86-low.c
index dd7673126e..adddfe7797 100644
--- a/gdb/gdbserver/linux-x86-low.c
+++ b/gdb/gdbserver/linux-x86-low.c
@@ -339,6 +339,7 @@  x86_fill_gregset (struct regcache *regcache, void *buf)
   collect_register_by_name (regcache, "orig_eax",
 			    ((char *) buf) + ORIG_EAX * REGSIZE);
 
+#ifdef __x86_64__
   /* Sign extend EAX value to avoid potential syscall restart
      problems. 
 
@@ -351,6 +352,7 @@  x86_fill_gregset (struct regcache *regcache, void *buf)
 
       *(int64_t *) ptr = *(int32_t *) ptr;
     }
+#endif
 }
 
 static void