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Re: DWARF2 exception doesn't work with gcc and gas on MIPS.

To: "H . J . Lu" <hjl@lucon.org>
Subject: Re: DWARF2 exception doesn't work with gcc and gas on MIPS.
From: Richard Henderson <rth@redhat.com>
Date: Thu, 14 Jun 2001 12:05:43 -0700
Cc: gcc@gcc.gnu.org, binutils@sourceware.cygnus.com, linux-mips@oss.sgi.com
In-reply-to: <20010614114117.A3092@lucon.org>; from hjl@lucon.org on Thu, Jun 14, 2001 at 11:41:17AM -0700
Mail-followup-to: Richard Henderson <rth@redhat.com>, "H . J . Lu" <hjl@lucon.org>, gcc@gcc.gnu.org, binutils@sourceware.cygnus.com, linux-mips@oss.sgi.com
References: <20010613212940.A22683@lucon.org> <20010614101951.B28824@redhat.com> <20010614114117.A3092@lucon.org>
Sender: owner-linux-mips@oss.sgi.com
User-agent: Mutt/1.2.5i
On Thu, Jun 14, 2001 at 11:41:17AM -0700, H . J . Lu wrote:
> 1. Is the usage of current_frame_info.args_size right?

Yes.

> 2. What should be in the place of [(const_int 4)]?

Some unspec_volatile.

> 3. Does it need other patterns for similar situations?

Yes, O64.

> 4. Is my patch ok?

No.

This one should be ok.


r~


Index: mips.md
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/mips/mips.md,v
retrieving revision 1.94
diff -c -p -d -r1.94 mips.md
*** mips.md     2001/05/20 00:35:24     1.94
--- mips.md     2001/06/14 18:50:32
***************
*** 30,42 ****
  ;; Number     USE
  ;; 0          movsi_ul
  ;; 1          movsi_us, get_fnaddr
- ;; 2          loadgp
  ;; 3          eh_set_return
  ;; 20         builtin_setjmp_setup
  ;;
  ;; UNSPEC_VOLATILE values
  ;; 0          blockage
  ;; 3          builtin_longjmp
  ;; 10         consttable_qi
  ;; 11         consttable_hi
  ;; 12         consttable_si
--- 30,43 ----
  ;; Number     USE
  ;; 0          movsi_ul
  ;; 1          movsi_us, get_fnaddr
  ;; 3          eh_set_return
  ;; 20         builtin_setjmp_setup
  ;;
  ;; UNSPEC_VOLATILE values
  ;; 0          blockage
+ ;; 2          loadgp
  ;; 3          builtin_longjmp
+ ;; 4          exception_receiver
  ;; 10         consttable_qi
  ;; 11         consttable_hi
  ;; 12         consttable_si
*************** ld\\t%2,%1-%S1(%2)\;daddu\\t%2,%2,$31\;j
*** 9571,9576 ****
--- 9572,9598 ----
                  operands[0]);
    DONE;
  }")
+ 
+ (define_insn "exception_receiver"
+   [(unspec_volatile [(const_int 0)] 4)]
+   "TARGET_ABICALLS && (mips_abi == ABI_32 || mips_abi == ABI_O64)"
+   "*
+ {
+   rtx loc;
+ 
+   operands[0] = gen_rtx_REG (Pmode, PIC_FUNCTION_ADDR_REGNUM);
+ 
+   if (frame_pointer_needed)
+     loc = hard_frame_pointer_rtx;
+   else
+     loc = stack_pointer_rtx;
+   loc = plus_constant (loc, current_frame_info.args_size);
+   operands[1] = gen_rtx_MEM (Pmode, loc);
+ 
+   return mips_move_1word (operands, insn, 0);
+ }"
+   [(set_attr "type"   "load")
+    (set_attr "length" "8")])
  
  ;;
  ;;  ....................

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