c8e02dfe73
-fschedule-insns as it wasn't such a big win with 2.95 after all. Add the *BIG* win "-mpreferred-stack-boundary=2" optimiztion submitted by Dima. GCC 2.95 ensures the stack frame is always properly [opitimally] aligned by surrounding every function call by code simular to "addl $-12, %esp" / "addl $12, %esp". Here we need the reduction in space, with speed not an issue.
82 lines
2.0 KiB
Makefile
82 lines
2.0 KiB
Makefile
# $FreeBSD$
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PROG= boot2
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NOMAN=
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STRIP=
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BINDIR?= /boot
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BINMODE= 444
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CLEANFILES+= boot1 boot1.out boot1.o \
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boot2.ldr boot2.bin boot2.ld boot2.out boot2.o \
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sio.o
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M4?= m4
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# A value of 0x80 enables LBA support.
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B1FLAGS= 0
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BOOT_COMCONSOLE_PORT?= 0x3f8
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BOOT_COMCONSOLE_SPEED?= 9600
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B2SIOFMT?= 0x3
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.if exists(${.OBJDIR}/../btx)
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BTX= ${.OBJDIR}/../btx
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.else
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BTX= ${.CURDIR}/../btx
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.endif
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ORG1= 0x7c00
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ORG2= 0x1000
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CFLAGS= -elf -I${.CURDIR}/../btx/lib -I. \
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-Os -fno-builtin -fforce-addr -fdata-sections \
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-malign-functions=0 -malign-jumps=0 -malign-loops=0 -mrtd \
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-mpreferred-stack-boundary=2 \
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-Wall -Waggregate-return -Wbad-function-cast -Wcast-align \
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-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
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-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings
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LDFLAGS=-nostdlib -static -N
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all: boot1 boot2
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boot1: boot1.out
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objcopy -S -O binary boot1.out ${.TARGET}
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boot1.out: boot1.o
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${LD} ${LDFLAGS} -e start -Ttext ${ORG1} -o ${.TARGET} boot1.o
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boot1.o: boot1.m4 boot1.s
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(cd ${.CURDIR}; ${M4} -DFLAGS=${B1FLAGS} boot1.m4 boot1.s) | \
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${AS} ${AFLAGS} -o ${.TARGET}
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boot2: boot2.ldr boot2.bin
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btxld -v -E ${ORG2} -f bin -b ${BTX}/btx/btx -l boot2.ldr \
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-o boot2.ld -P 1 boot2.bin
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@ls -l boot2.ld | awk '{ x = 7680 - $$5; \
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print x " bytes available"; if (x < 0) exit 1 }'
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dd if=boot2.ld of=${.TARGET} obs=7680 conv=osync 2>/dev/null
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boot2.ldr:
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dd if=/dev/zero of=${.TARGET} bs=512 count=1 2>/dev/null
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boot2.bin: boot2.out
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objcopy -S -O binary boot2.out ${.TARGET}
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boot2.out: boot2.o sio.o
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${LD} ${LDFLAGS} -Ttext ${ORG2} -o ${.TARGET} \
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${BTX}/lib/crt0.o boot2.o sio.o
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sio.o: sio.s
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(cd ${.CURDIR}; ${M4} -DSIOPRT=${BOOT_COMCONSOLE_PORT} \
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-DSIOFMT=${B2SIOFMT} \
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-DSIOSPD=${BOOT_COMCONSOLE_SPEED} sio.s) | \
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${AS} ${AFLAGS} -o ${.TARGET}
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install:
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${INSTALL} ${COPY} -o ${BINOWN} -g ${BINGRP} -m ${BINMODE} \
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boot1 ${DESTDIR}${BINDIR}/boot1
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${INSTALL} ${COPY} -o ${BINOWN} -g ${BINGRP} -m ${BINMODE} \
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boot2 ${DESTDIR}${BINDIR}/boot2
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.include <bsd.prog.mk>
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