/
h8300-i586.S
138 lines (119 loc) · 3 KB
/
h8300-i586.S
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/* Emulator for LEGO RCX Brick, Copyright (C) 2003 Jochen Hoenicke.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; see the file COPYING.LESSER. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: h8300-i586.S 311 2006-03-07 11:15:42Z hoenicke $
*/
#if defined(__CYGWIN__) || defined(__OpenBSD__)
#define EXTERN(x) _##x
#define LOCAL(x) .L##x
#else
#define EXTERN(x) x
#define LOCAL(x) .L##x
#endif
.file "h8300-i586.S"
.text
.align 2
.globl EXTERN(run_cpu_asm)
#if defined(__CYGWIN__) || defined(__OpenBSD__)
.def EXTERN(run_cpu_asm); .scl 2; .type 32; .endef
#else
.type EXTERN(run_cpu_asm),@function
#endif
EXTERN(run_cpu_asm):
pushl %ebp
movl %esp, %ebp /* needed by GDB */
pushl %ebx
call EXTERN(mcount)
pushl %esi
pushl %edi
movzwl EXTERN(pc), %esi
testl $1,%esi
jnz LOCAL(unaligned)
movzbl EXTERN(ccr), %ebx
movl EXTERN(cycles), %ebp
movl EXTERN(next_timer_cycle), %edi
orb %bl, %bl
cmovsl EXTERN(next_nmi_cycle), %edi
subl %edi, %ebp
js LOCAL(start)
.align 16
LOCAL(clean_up):
movw %si, EXTERN(pc)
movb %bl, EXTERN(ccr)
movl EXTERN(next_timer_cycle), %edi
or %bl, %bl
cmovsl EXTERN(next_nmi_cycle), %edi
addl %edi, %ebp
movl %ebp, EXTERN(cycles)
popl %edi
popl %esi
popl %ebx
popl %ebp
ret
.align 16
LOCAL(check_log):
testb $0x81, EXTERN(memtype)(%esi)
jnz LOCAL(clean_up)
movw %si, EXTERN(pc)
movb %bl, EXTERN(ccr)
movl %ebp, %edi
movl EXTERN(next_timer_cycle), %eax
or %bl, %bl
cmovsl EXTERN(next_nmi_cycle), %eax
addl %eax, %ebp
movl %ebp, EXTERN(cycles)
leal 12(%esp), %ebp
call EXTERN(dump_state)
movl %edi, %ebp
movb EXTERN(ccr), %bl
jmp LOCAL(dispatch_opcode)
.align 16
LOCAL(default_epilogue):
addl $2,%ebp
LOCAL(default_epilogue_nocycles):
xorl %eax,%eax
testb $0x40, EXTERN(memtype)(%esi)
setz %al
addl $2,%esi
leal (%ebp,%eax,4),%ebp
LOCAL(loop):
orl %ebp,%ebp
jns LOCAL(clean_up)
LOCAL(start):
testb $0x83, EXTERN(memtype)(%esi)
jnz LOCAL(check_log)
LOCAL(dispatch_opcode):
xorl %ecx,%ecx
movb EXTERN(memory)(%esi), %cl
xorl %edx,%edx
movb EXTERN(memory)+1(%esi), %dl
movl opctable(,%ecx,4),%eax
incl EXTERN(frame_asmopcstat)(,%ecx,4)
jmp *%eax
LOCAL(illegalOpcode):
movl $4, EXTERN(db_trap)
jmp LOCAL(clean_up)
#include "h8300-i586.inc"
LOCAL(illegaladdr):
LOCAL(unaligned):
movl $10, EXTERN(db_trap)
jmp LOCAL(clean_up)
LOCAL(trap):
movl $5, EXTERN(db_trap)
jmp LOCAL(clean_up)
.section .rodata
add2flags:
.byte 0x00, 0x0a, 0x02, 0x08