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x86/Linux: disable all-stop on top of non-stop 

Markus reported that ASNS breaks target record-btrace.  In particular,
the gdb.btrace/multi-thread-step.exp test fails (both with BTS and PT
tracing) with a crash in py-inferior.c:

 Program received signal SIGSEGV, Segmentation fault.

 0x00000000006aa40d in add_thread_object (tp=0x27d32d0)

     at /users/mmetzger/team/gdb/git/gdb/python/py-inferior.c:337

 337       entry->next = inf_obj->threads;

My machine doesn't support BTS nor PT, so I missed this...

Disabling ASNS temporarily on x86 until this is addressed.

Tested on x86_64 Fedora 20.

gdb/ChangeLog:
2015-08-18  Pedro Alves  <palves@redhat.com>

	* linux-nat.c (linux_nat_always_non_stop_p): If the linux_ops
	target implements to_always_non_stop_p, call it.
	* x86-linux-nat.c (x86_linux_always_non_stop_p): New function.
	(x86_linux_create_target): Install it as to_always_non_stop_p
	method.
This commit is contained in:
Pedro Alves 2015-08-18 11:04:30 +01:00
parent fe875424a0
commit b2a3343990
3 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
gdb/ChangeLog
View File

@ -1,3 +1,11 @@
2015-08-18 Pedro Alves <palves@redhat.com>
* linux-nat.c (linux_nat_always_non_stop_p): If the linux_ops
target implements to_always_non_stop_p, call it.
* x86-linux-nat.c (x86_linux_always_non_stop_p): New function.
(x86_linux_create_target): Install it as to_always_non_stop_p
method.
2015-08-17 Doug Evans <dje@google.com>
* ui-out.c (default_ui_out_impl): Add comment.

2
gdb/linux-nat.c
View File

@ -4594,6 +4594,8 @@ linux_nat_supports_non_stop (struct target_ops *self)
static int
linux_nat_always_non_stop_p (struct target_ops *self)
{
if (linux_ops->to_always_non_stop_p != NULL)
return linux_ops->to_always_non_stop_p (linux_ops);
return 1;
}

11
gdb/x86-linux-nat.c
View File

@ -357,6 +357,15 @@ x86_linux_get_thread_area (pid_t pid, void *addr, unsigned int *base_addr)
}
/* to_always_non_stop_p implementation. */
static int
x86_linux_always_non_stop_p (struct target_ops *self)
{
/* Enabling this breaks the btrace target. */
return 0;
}
/* Create an x86 GNU/Linux target. */
struct target_ops *
@ -389,6 +398,8 @@ x86_linux_create_target (void)
t->to_read_btrace = x86_linux_read_btrace;
t->to_btrace_conf = x86_linux_btrace_conf;
t->to_always_non_stop_p = x86_linux_always_non_stop_p;
return t;
}