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Re: [RFC] .debug_frame adjustments for mips-irix
> ------------------------------------------------------------------------------
> 2005-03-15 Olivier Hainque <hainque@adacore.com>
>
> * dwarf2out.c (dwarf2out_frame_finish): Honor DWARF2_FRAME_INFO
> defined and non-zero.
This one looks ok to me. I can't approve it, but it seems reasonable.
> ------------------------------------------------------------------------------
> 2005-03-15 Olivier Hainque <hainque@adacore.com>
>
> * config/mips/iris6.h (DWARF_FRAME_RETURN_COLUMN): Redefine to
> match what the system unwinder expects.
> * config/mips/mips.c (mips_frame_set): If we're saving the return
> address register and the dwarf return address column number differs
> from the hard register number, note the dwarf return address save
> too.
>
> *** gcc/config/mips/iris6.h.ori Tue Mar 15 06:39:49 2005
> --- gcc/config/mips/iris6.h Tue Mar 15 08:30:43 2005
> *************** Boston, MA 02111-1307, USA. */
> *** 165,170 ****
> --- 165,175 ----
> compiling -g. This guarantees that we can unwind the stack. */
> #define DWARF2_FRAME_INFO !TARGET_SGI_O32_AS
>
> + /* The system unwinder in libexc requires a specific dwarf return address
> + column to work. */
> + #undef DWARF_FRAME_RETURN_COLUMN
> + #define DWARF_FRAME_RETURN_COLUMN (FP_REG_LAST + 1)
> +
This part is ok.
> +
> + /* If we're saving the return address register and the dwarf return
> + address column number differs from the hard register number, note
> + the dwarf return address save too. */
> + if (REGNO (reg) == GP_REG_FIRST + 31
> + && DWARF_FRAME_RETURN_COLUMN != GP_REG_FIRST + 31)
> + {
> + rtx ra_column_set
> + = gen_rtx_SET (VOIDmode,
> + mem,
> + gen_rtx_REG (word_mode, DWARF_FRAME_RETURN_COLUMN));
> + RTX_FRAME_RELATED_P (ra_column_set) = 1;
> +
> + set = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (2, set, ra_column_set));
> + }
> +
I don't think this is necessary because of this code in
initial_return_save:
if (reg != DWARF_FRAME_RETURN_COLUMN)
reg_save (NULL, DWARF_FRAME_RETURN_COLUMN, reg, offset -
cfa.offset);
-eric