PATCH: stfiwx implementation for PowerPC gdb simulator

[Tom Marn <tom.marn@telargo.com>]

[-- Attachment #1: Type: text/plain, Size: 378 bytes --]

Hi

I append new optional instruction "stfiwx" for PowerPC 603/603e/604 needed by gdb inside sim/ppc simulator. GNU gcc already generates binaries with this instruction and the patch is essential for properly running binaries on gdb simulator (target sim). Without this patch you will get: program interrupt - illegal instruction (optional instruction not supported)

Tom Marn


[-- Attachment #2: gdb-sim-ppc-stfiwx-instruction.patch --]
[-- Type: text/x-patch, Size: 1444 bytes --]

2006-11-22  Tom Marn <tom.marn@telargo.com>
  
    * ppc-instructions: implementation of optional PowerPC stfiwx 
                        instruction for gdb and insight source to avoid
                        illegal instruction code interrupt

--- gdb-6.5/sim/ppc/ppc-instructions.orig	2006-11-22 09:25:56.000000000 +0100
+++ gdb-6.5/sim/ppc/ppc-instructions	2006-11-22 09:42:34.000000000 +0100
@@ -3644,6 +3644,18 @@
 	STORE(EA, 8, *frS);
 	PPC_INSN_INT_FLOAT(0, 0, (RA_BITMASK & ~1) | RB_BITMASK, FRS_BITMASK);
 
+0.31,6.FRS,11.RA,16.RB,21.983,31./:X:f::Store Floating-Point Integer Word Indexed
+*603: PPC_UNIT_LSU,   PPC_UNIT_LSU,   1,  2,  0
+*603e:PPC_UNIT_LSU,   PPC_UNIT_LSU,   1,  2,  0
+*604: PPC_UNIT_LSU,   PPC_UNIT_LSU,   1,  3,  0
+	unsigned_word b;
+	unsigned_word EA;
+	if (RA_is_0) b = 0;
+	else         b = *rA;
+	EA = b + *rB;
+	STORE(EA, 4, *frS);
+	PPC_INSN_INT_FLOAT(0, 0, (RA_BITMASK & ~1) | RB_BITMASK, FRS_BITMASK);
+
 0.55,6.FRS,11.RA,16.D:D:f::Store Floating-Point Double with Update
 *601: PPC_UNIT_IU,    PPC_UNIT_IU,    1,  1,  0
 *603: PPC_UNIT_LSU,   PPC_UNIT_LSU,   1,  2,  0
@@ -4682,13 +4694,6 @@
 	FPSCR |= bit;
 	FPSCR_END(Rc);
 
-
-#
-# I.A.1.1 Floating-Point Store Instruction
-#
-0.31,6.FRS,11.RA,16.RB,21.983,31./:X:f,o::Store Floating-Point as Integer Word Indexed
-	program_interrupt(processor, cia, optional_instruction_program_interrupt);
-
 #
 # I.A.1.2 Floating-Point Arithmetic Instructions
 #