Adds a simple program which starts at 1 GB.

This commit is contained in:
Felix Queißner 2016-05-07 16:59:40 +02:00
parent 455a6db8b5
commit cc61fbecb9
4 changed files with 102 additions and 0 deletions

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AS=gcc
CC=gcc
CXX=g++
LD=ld
FLAGS = -mno-sse -DIDT_DISPATCH=$(IDT_DISPATCH) -ffreestanding -m32 -Werror -Wall -iquote include -iquote lists -O3 -g
ASFLAGS = $(FLAGS)
CFLAGS = $(FLAGS)
CXXFLAGS = $(FLAGS) -std=c++14 -fno-rtti -fno-exceptions -fno-leading-underscore -fno-use-cxa-atexit -nostdlib -fno-builtin
ARTIFACT = program0.bin
SRCS = $(shell find -regextype egrep -regex '.*/.*\.(cpp|S|c)')
OBJS = $(addsuffix .o, $(notdir $(basename $(SRCS))))
LIBGCC = $(shell gcc -m32 -print-libgcc-file-name)
all: $(ARTIFACT)
$(ARTIFACT): $(OBJS)
$(LD) -melf_i386 -Tlinker.ld -o $(ARTIFACT) $(addprefix obj/, $^) $(LIBGCC)
%.o: %.cpp
$(CXX) $(CXXFLAGS) -c -o obj/$@ $<
%.o: %.c
$(CC) $(ASFLAGS) -c -o obj/$@ $<
%.o: %.S
$(AS) $(CFLAGS) -c -o obj/$@ $<
%.o: src/%.cpp
$(CXX) $(CXXFLAGS) -c -o obj/$@ $<
%.o: src/%.c
$(CC) $(ASFLAGS) -c -o obj/$@ $<
%.o: src/%.S
$(AS) $(CFLAGS) -c -o obj/$@ $<
# Linux/Multiboot boot specific:
# -kernel bzImage use 'bzImage' as kernel image
# -append cmdline use 'cmdline' as kernel command line
# -initrd file use 'file' as initial ram disk
# -dtb file use 'file' as device tree image
run:
qemu-system-i386 \
-kernel kernel-base.ker \
-m 64 \
-d cpu_reset,int \
-no-reboot \
-no-shutdown \
-serial stdio
bnr: kernel-base.ker run
deploy: kernel-base.ker
cp $(ARTIFACT) /srv/tftp/$(ARTIFACT)

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ENTRY(_start)
OUTPUT_FORMAT(binary)
OUTPUT_ARCH(i386:i386)
SECTIONS
{
. = 0x40000000;
.text : {
*(.text)
}
.data ALIGN(4096) : {
start_ctors = .;
KEEP(*( .init_array ));
KEEP(*(SORT_BY_INIT_PRIORITY( .init_array.* )));
end_ctors = .;
start_dtors = .;
KEEP(*( .fini_array ));
end_dtors = .;
*(.data)
}
.rodata ALIGN(4096) : {
*(.rodata)
}
.bss ALIGN(4096) : {
*(.bss)
}
. = ALIGN(4096);
}

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#include <inttypes.h>
uint16_t *video = (uint16_t*)0xB8000;
void _start()
{
for(int i = 0; i < 256; i++) {
video[i] = 0xF000 | i;
}
while(1);
}

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