[RFC/TileGX 2/6] simplify the handling of skip prologue for plt stub

[Yao Qi]

On 02/20/2013 10:48 AM, Jiong Wang wrote:
> gdb/ChangeLog:
>
>           * tilegx-tdep.c (tilegx_skip_prologue): when prefetching
                                                    ^^^^ "When"
>           multiple instruction bundles, check section boundary
>           instead of page boundary.

Is it possible that the section layouts on two pages?  I mean, if is 
possible that NEXT_ADDR is within section FOO and page A, but the end of 
section FOO is within page A + 1.  If this is true, we need to check to 
the min (page boundary, section boundary), otherwise, we don't have to 
worry about it.

> ---
>   gdb/tilegx-tdep.c | 12 ++++++++----
>   1 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/gdb/tilegx-tdep.c b/gdb/tilegx-tdep.c
> index 2c4e349..f8a6255 100644
> --- a/gdb/tilegx-tdep.c
> +++ b/gdb/tilegx-tdep.c
> @@ -424,15 +424,18 @@ tilegx_analyze_prologue (struct gdbarch* gdbarch,
>         /* Retrieve the next instruction.  */
>         if (next_addr - instbuf_start >= instbuf_size)
>   	{
> -	  /* Figure out how many bytes to fetch.  Don't span a page
> +	  /* Figure out how many bytes to fetch.  Don't span a section
>   	     boundary since that might cause an unnecessary memory
>   	     error.  */
> -	  unsigned int size_on_same_page = 4096 - (next_addr & 4095);
> +	  unsigned int size_on_same_section;
> +	  struct obj_section *s = find_pc_section(next_addr);

A space is needed between find_pc_section and "(".  A blank line is 
needed here as well.

> +	  gdb_assert(s != NULL);
A space is needed between gdb_assert and "(".

I have no other comments on this patch.  It looks good now, but it still 
needs a review and approval from maintainers.

-- 
Yao (脝毛脪垄)