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authorRoland McGrath <roland@redhat.com>2007-09-24 19:52:44 -0400
committerPaul Mackerras <paulus@samba.org>2007-09-25 06:40:41 -0400
commit474f81967217f3bec2389ae913da72641f2c40e3 (patch)
tree8c9e16b05eeb0f56c49dcf61b145732569010ec8 /fs/partitions/sysv68.h
parent4942de4a0e914f205d351a81873f4f63986bcc3c (diff)
[POWERPC] Ensure FULL_REGS on exec
When PTRACE_O_TRACEEXEC is used, a ptrace call to fetch the registers at the PTRACE_EVENT_EXEC stop (PTRACE_PEEKUSR) will oops in CHECK_FULL_REGS. With recent versions, "gdb --args /bin/sh -c 'exec /bin/true'" and "run" at the (gdb) prompt is sufficient to produce this. I also have written an isolated test case, see https://bugzilla.redhat.com/show_bug.cgi?id=301791#c15. This change fixes the problem by clearing the low bit of pt_regs.trap in start_thread so that FULL_REGS is true again. This is correct since all of the GPRs that "full" refers to are cleared in start_thread. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'fs/partitions/sysv68.h')
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