[PATCH 03/12] gdbserver: Add assert in x86_linux_read_description.

[Schimpe, Christina]

On x86 the PTRACE_GETREGSET request is currently only used for the xstate regset.
The size of the xstate regset is initialized to 0 such that it can be reset to
the appropriate size once we know it is supported for the current target
in x86_linux_read_description.

However, this configuration would not just affect the xstate regset but any regset
with PTRACE_GETREGSET request that is added in the future.  The new regset  would be
misconfigured with the xstate regset size.  To avoid this we add an assert for
unsupported regsets and check explicitly for the note type of the register set.
---
 gdbserver/linux-x86-low.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdbserver/linux-x86-low.cc b/gdbserver/linux-x86-low.cc
index 6c2688d3678..b023b34a0a4 100644
--- a/gdbserver/linux-x86-low.cc
+++ b/gdbserver/linux-x86-low.cc
@@ -894,7 +894,12 @@ x86_linux_read_description ()
 	   regset++)
 	{
 	  if (regset->get_request == PTRACE_GETREGSET)
-	    regset->size = xsave_len;
+	    {
+	      if (regset->nt_type == NT_X86_XSTATE)
+		regset->size = xsave_len;
+	      else
+		gdb_assert_not_reached ("invalid regset type.");
+	    }
 	  else if (regset->type != GENERAL_REGS)
 	    regset->size = 0;
 	}
-- 
2.34.1

Intel Deutschland GmbH
Registered Address: Am Campeon 10, 85579 Neubiberg, Germany
Tel: +49 89 99 8853-0, www.intel.de
Managing Directors: Sean Fennelly, Jeffrey Schneiderman, Tiffany Doon Silva
Chairperson of the Supervisory Board: Nicole Lau
Registered Office: Munich
Commercial Register: Amtsgericht Muenchen HRB 186928