[Bug gdb/18490] New: If the remote target don’t return ISA bit in T packet GDB will stop at the wrong line

[Bug gdb/18490] New: If the remote target don’t return ISA bit in T packet GDB will stop at the wrong line

[ggs334 at 163 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18490

            Bug ID: 18490
           Summary: If the remote target don’t return ISA bit in T packet
                    GDB will stop at the wrong line
           Product: gdb
           Version: 7.9
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: ggs334 at 163 dot com
  Target Milestone: ---

I found that this commit will cause some issue on embed system：
====================================
3e29f34a4eef29f5b159749ccb1efb8867b2e651
MIPS: Keep the ISA bit in compressed code addresses
====================================
If the remote target don’t return mode bit in T packet
GDB will stop at the wrong line:

Sending packet: $vCont;c#a8...Packet received: T0525:80001152;1d:800fffa0;
Sending packet: $qL1200000000000000000#50...Packet received: 
Sending packet: $z0,80001152,2#c5...Packet received: OK
Sending packet: $z0,800011ba,2#21...Packet received: OK
Sending packet: $z0,8000127e,2#fb...Packet received: OK
fun () at
/home/guosheng_gao/repo/debugger/gdb-7.9/gdb/testsuite/gdb.base/call-sc.c:40
40      {
(gdb) FAIL: gdb.base/call-sc.exp: advance to fun for return; return call-sc-tc
p/c L
Sending packet: $m8000347c,1#93...Packet received: 5a
$3 = 90 'Z'
(gdb) PASS: gdb.base/call-sc.exp: zed L for return; return call-sc-tc
return foo
in fact we must stop at line 41
Dump of assembler code for function fun:
40      {
   0x8000114d <+11>:    addiu   sp,-8
   0x8000114f <+1>:     sw      s1,4(sp)
   0x80001151 <+3>:     move    s1,sp

41        return foo;
   0x80001153 <+5>:     lw      v0,0x8000116c <fun+31>
   0x80001155 <+7>:     move    t8,v0
   0x80001157 <+9>:     move    v0,t8
   0x80001159 <+11>:    lb      v0,0(v0)
   0x8000115b <+13>:    move    t8,v0
   0x8000115d <+15>:    move    v0,t8
   0x8000115f <+17>:    move    t8,v0

42      }
   0x80001161 <+19>:    move    v0,t8
   0x80001163 <+21>:    move    sp,s1
   0x80001165 <+23>:    lw      s1,4(sp)
   0x80001167 <+25>:    addiu   sp,8
   0x80001169 <+27>:    jr      ra
   0x8000116b <+29>:    nop
   0x8000116d <+31>:    lb      s0,0(s0)
   0x8000116f <+33>:    sll     a0,v1,4

End of assembler dump.

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From: "gbenson at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/17626] attach, detach, attach did not work
Date: Fri, 05 Jun 2015 11:27:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id\x17626

Gary Benson <gbenson at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gbenson at redhat dot com

--- Comment #4 from Gary Benson <gbenson at redhat dot com> ---
Version 2 patch here:

 https://sourceware.org/ml/gdb-patches/2015-06/msg00080.html

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