Re: [PATCH] gdbserver x86 on win32: call init_target_desc

[Pedro Alves <palves at redhat dot com>]

On 09/20/2017 08:25 AM, Simon Marchi wrote:
> When trying to run gdbserver compiled for x86 win32 under wine, I get:
> 
>   $ wine ./gdbserver/gdbserver.exe --once :1234 ./test
>   /home/emaisin/src/binutils-gdb/gdb/gdbserver/regcache.c:177: A problem internal to GDBserver has been detected.
>   regcache* new_register_cache(const target_desc*): Assertion `tdesc->registers_size != 0' failed.
> 
> It seems like on that platform, init_target_desc is never called, so
> registers_size is never computed.
> 
> My first thought was to call init_target_desc somewhere in win32-low.c,
> but it turns out that when using win32 on arm, the target description is
> already initialized by the generated code.  My second thought was to
> call it in {i386,amd64}_create_target_description, but those functions
> are shared with GDB, and init_target_desc is gdbserver-specific.  So I
> ended up with the simplest fix, calling it in i386_arch_setup.

I assume that lynx-i386-low.c and nto-x86-low.c have the same problem?

 $ grep create_target_description *.c
 linux-x86-tdesc.c:      *tdesc = i386_create_target_description (xcr0, true);
 linux-x86-tdesc.c:      *tdesc = amd64_create_target_description (xcr0, is_x32, true);
 lynx-i386-low.c:  lynx_tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false);
 nto-x86-low.c:  nto_tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false);
 win32-i386-low.c:  win32_tdesc = amd64_create_target_description (X86_XSTATE_SSE_MASK, false,
 win32-i386-low.c:  win32_tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false);

Thanks,
Pedro Alves