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Subject: Patch for Bug in GDB Simulator for h8300h targets
Date: Tue, 09 Dec 2003 11:51:00 -0000
Message-ID: <69595093233BB547BB70CF5E492B63F20324E882@sohm.kpit.com>
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From: "Anil Paranjape" <AnilP1@KPITCummins.com>
To: <gdb-patches@sources.redhat.com>
X-SW-Source: 2003-12/txt/msg00274.txt.bz2

Hi,

I have found one bug in simulator while debugging h8300h target in GDB.=20

************************** test.s ***********************************
	.h8300h
	.section .text
	.global	_start
_start:
	mov #0xFFEFC0,er7
	mov.l	er6,@-er7
	mov.l 	er7,er6
	mov.l	@er7+,er6
_exit:
        sleep
        bra _exit
       .end
**********************************************************************
Above code is compiled with following command,
h8300-elf-gcc -mh -nostartfiles -Wa,-gdwarf2 -o test.out test.s

When test.out is loaded in GDB simulator, the first insn at _start gets exe=
cuted properly.=20
But after executing "mov.l er6,@-er7" insn, value of er7 becomes 0x3EFBC in=
stead of 0xFFEFBC.

The address range for H8300H targets is defined as 18 bits.=20
But actually it is 24 bits, same as of H8300S targets.

Following is a patch which fixes this bug,

--- sim-main.h.orig     Tue Dec  9 16:25:16 2003
+++ sim-main.h  Tue Dec  9 16:25:44 2003
@@ -27,7 +27,7 @@
 /* avolkov:
    Next 2 macros are ugly for any workstation, but while they're work.
    Memory size MUST be configurable.  */
-#define H8300H_MSIZE (1 << 18)
+#define H8300H_MSIZE (1 << 24)
 #define H8300S_MSIZE (1 << 24)

 #define CSIZE 1024

Regards,
Anil Paranjpe