ext/caos-with-snake
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Do not use cat or type.

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This commit is contained in:
Alexander Myltsev 2024-02-10 01:39:02 +04:00
parent 70cd658ad0
commit fea8b881af
2 changed files with 24 additions and 11 deletions
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7
Makefile
View File

@ -105,9 +105,6 @@ LDFLAGS=-m elf_i386
user/%: user/%.o user/crt.o
$(LD) $(LDFLAGS) -o $@ -Ttext 0x1000 $^
image.bin: mbr.bin fs.img
$(CAT) $^ >$@
kernel.bin: $(OBJECTS)
$(LD) $(LDFLAGS) $(LDKERNELFLAGS) -o $@ -Ttext 0x9000 $^
@ -120,9 +117,9 @@ bootmain.o: bootmain.c
%.o: %.S
$(CC) $(ASMFLAGS) $^ -o $@
mbr.bin: mbr.elf tools/mbrpad
image.bin: mbr.elf tools/mbrpad fs.img
$(OBJCOPY) -S -O binary -j .text $< $@
tools/mbrpad $@
tools/mbrpad $@ fs.img
mbr.raw: mbr.o bootmain.o
$(LD) -N -m elf_i386 -Ttext=0x7c00 --oformat=binary $^ -o $@

28
tools/mbrpad.c
View File

@ -3,20 +3,36 @@
#include <stdio.h>
#include <stdint.h>
enum {
MBR_END = 510,
};
int main(int argc, char* argv[]) {
if (argc != 2) {
fprintf(stderr, "Usage: %s mbr.bin\n", argv[0]);
if (argc != 3) {
fprintf(stderr, "Usage: %s mbr.bin fs.img\n", argv[0]);
return 1;
}
const char* filename = argv[1];
const char* fsimg_path = argv[2];
int fd = open(filename, O_RDWR);
off_t length = lseek(fd, 0, SEEK_END);
if (length > 510) {
fprintf(stderr, "file %s is larger than 510 bytes (size: %llu)\n",
filename, (unsigned long long)length);
if (length > MBR_END) {
fprintf(stderr, "file %s is larger than %d bytes (size: %llu)\n",
filename, MBR_END, (unsigned long long)length);
return 1;
}
lseek(fd, 510, SEEK_SET);
lseek(fd, MBR_END, SEEK_SET);
write(fd, "\x55\xaa", 2);
int fsimg = open(fsimg_path, O_RDONLY);
if (fsimg < 0) {
perror(fsimg_path);
return 1;
}
char buf[1024];
ssize_t bytes;
while ((bytes = read(fsimg, buf, sizeof(buf))) > 0) {
write(fd, buf, bytes);
}
return 0;
}