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Support a.out: avoid (%dx) in in/out instructions, and use an m4

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macro to supply underscores for externals.
This commit is contained in:
Robert Nordier 2000-11-04 13:03:52 +00:00
parent 35633713e5
commit 9e3377b8b3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=68314
5 changed files with 34 additions and 11 deletions
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11
sys/boot/i386/kgzldr/Makefile
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@ -4,7 +4,12 @@ MAINTAINER= rnordier
PROG= kgzldr.o
SRCS= start.s boot.c inflate.c lib.c crt.s sio.s
CFLAGS= -fno-builtin -Os
CFLAGS= -fno-builtin
.if ${OBJFORMAT} == aout
CFLAGS+=-O2
.else
CFLAGS+=-Os
.endif
CFLAGS+=-DKZIP
LDFLAGS=-nostdlib -static -r
NOMAN=
@ -14,7 +19,7 @@ STRIP=
.PATH: ${.CURDIR}/../../../kern
M4?= m4
M4FLAGS=
M4FLAGS=-DOBJFORMAT=${OBJFORMAT}
BOOT_COMCONSOLE_PORT?= 0x3f8
M4FLAGS+=-DSIOPRT=${BOOT_COMCONSOLE_PORT}
@ -25,7 +30,7 @@ kgzldr.o: ${OBJS}
${CC} ${LDFLAGS} -o ${.TARGET} ${OBJS}
.s.o:
(cd ${.CURDIR}; ${M4} ${M4FLAGS} ${.IMPSRC}) |\
(cd ${.CURDIR}; ${M4} ${M4FLAGS} kgzldr.m4 ${.IMPSRC}) |\
${AS} ${AFLAGS} -o ${.TARGET}
.include <bsd.prog.mk>

4
sys/boot/i386/kgzldr/crt.s
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@ -38,11 +38,11 @@
.set BDA_SCR,0x449 # Video mode
.set BDA_POS,0x450 # Cursor position
.globl crt_putchr
.globl _(crt_putchr)
# void crt_putchr(int c)
crt_putchr: movb 0x4(%esp,1),%al # Get character
_(crt_putchr): movb 0x4(%esp,1),%al # Get character
pusha # Save
xorl %ecx,%ecx # Zero for loops
movb $SCR_MAT,%ah # Mode/attribute

18
sys/boot/i386/kgzldr/kgzldr.m4 Normal file
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@ -0,0 +1,18 @@
#
# Copyright (c) 2000 Robert Nordier
# All rights reserved.
#
# Redistribution and use in source and binary forms are freely
# permitted provided that the above copyright notice and this
# paragraph and the following disclaimer are duplicated in all
# such forms.
#
# This software is provided "AS IS" and without any express or
# implied warranties, including, without limitation, the implied
# warranties of merchantability and fitness for a particular
# purpose.
#
# $FreeBSD$
define(_,`ifelse(OBJFORMAT,`aout',`_$1',`$1')')

8
sys/boot/i386/kgzldr/sio.s
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@ -29,18 +29,18 @@
.set SIO_PRT,SIOPRT # Base port
.globl sio_putchr
.globl _(sio_putchr)
# void sio_putchr(int c)
sio_putchr: movw $SIO_PRT+0x5,%dx # Line status reg
_(sio_putchr): movw $SIO_PRT+0x5,%dx # Line status reg
xor %ecx,%ecx # Timeout
movb $0x40,%ch # counter
sio_putchr.1: inb (%dx),%al # Transmitter
sio_putchr.1: inb %dx,%al # Transmitter
testb $0x20,%al # buffer empty?
loopz sio_putchr.1 # No
jz sio_putchr.2 # If timeout
movb 0x4(%esp,1),%al # Get character
subb $0x5,%dl # Transmitter hold reg
outb %al,(%dx) # Write character
outb %al,%dx # Write character
sio_putchr.2: ret # To caller

4
sys/boot/i386/kgzldr/start.s
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@ -40,6 +40,6 @@ _start: cld # String ops inc
rep # Clear
stosb # bss
pushl 0x4(%esp) # Pass howto flags
call boot # Call C code
call _(boot) # Call C code
popl %ecx # Clear stack
jmp *kgz+entry # To loaded code
jmp *_(kgz)+entry # To loaded code