From 9d6a8a3df434df98bbd93b83f8f448cc19223e74 Mon Sep 17 00:00:00 2001 From: Furkan Mudanyali Date: Mon, 18 Jul 2022 09:59:04 +0300 Subject: [PATCH] Initial commit --- build.sh | 7 +++ clean.sh | 11 +++++ config.sh | 28 +++++++++++ default-host.sh | 2 + headers.sh | 9 ++++ iso.sh | 15 ++++++ kernel/.gitignore | 3 ++ kernel/Makefile | 83 ++++++++++++++++++++++++++++++++ kernel/arch/i386/boot.S | 34 +++++++++++++ kernel/arch/i386/crti.S | 13 +++++ kernel/arch/i386/crtn.S | 7 +++ kernel/arch/i386/linker.ld | 28 +++++++++++ kernel/arch/i386/make.config | 8 ++++ kernel/arch/i386/tty.c | 62 ++++++++++++++++++++++++ kernel/arch/i386/vga.h | 33 +++++++++++++ kernel/include/kernel/tty.h | 11 +++++ kernel/kernel/kernel.c | 8 ++++ libc/.gitignore | 3 ++ libc/Makefile | 93 ++++++++++++++++++++++++++++++++++++ libc/arch/i386/make.config | 8 ++++ libc/include/stdio.h | 20 ++++++++ libc/include/stdlib.h | 17 +++++++ libc/include/string.h | 21 ++++++++ libc/include/sys/cdefs.h | 6 +++ libc/stdio/printf.c | 88 ++++++++++++++++++++++++++++++++++ libc/stdio/putchar.c | 15 ++++++ libc/stdio/puts.c | 5 ++ libc/stdlib/abort.c | 16 +++++++ libc/string/memcmp.c | 14 ++++++ libc/string/memcpy.c | 10 ++++ libc/string/memmove.c | 17 +++++++ libc/string/memset.c | 9 ++++ libc/string/strlen.c | 9 ++++ qemu.sh | 5 ++ target-triplet-to-arch.sh | 6 +++ 35 files changed, 724 insertions(+) create mode 100755 build.sh create mode 100755 clean.sh create mode 100755 config.sh create mode 100755 default-host.sh create mode 100755 headers.sh create mode 100755 iso.sh create mode 100644 kernel/.gitignore create mode 100644 kernel/Makefile create mode 100644 kernel/arch/i386/boot.S create mode 100644 kernel/arch/i386/crti.S create mode 100644 kernel/arch/i386/crtn.S create mode 100644 kernel/arch/i386/linker.ld create mode 100644 kernel/arch/i386/make.config create mode 100644 kernel/arch/i386/tty.c create mode 100644 kernel/arch/i386/vga.h create mode 100644 kernel/include/kernel/tty.h create mode 100644 kernel/kernel/kernel.c create mode 100644 libc/.gitignore create mode 100644 libc/Makefile create mode 100644 libc/arch/i386/make.config create mode 100644 libc/include/stdio.h create mode 100644 libc/include/stdlib.h create mode 100644 libc/include/string.h create mode 100644 libc/include/sys/cdefs.h create mode 100644 libc/stdio/printf.c create mode 100644 libc/stdio/putchar.c create mode 100644 libc/stdio/puts.c create mode 100644 libc/stdlib/abort.c create mode 100644 libc/string/memcmp.c create mode 100644 libc/string/memcpy.c create mode 100644 libc/string/memmove.c create mode 100644 libc/string/memset.c create mode 100644 libc/string/strlen.c create mode 100755 qemu.sh create mode 100755 target-triplet-to-arch.sh diff --git a/build.sh b/build.sh new file mode 100755 index 0000000..8953f51 --- /dev/null +++ b/build.sh @@ -0,0 +1,7 @@ +#!/bin/sh +set -e +. ./headers.sh + +for PROJECT in $PROJECTS; do + (cd $PROJECT && DESTDIR="$SYSROOT" $MAKE install) +done diff --git a/clean.sh b/clean.sh new file mode 100755 index 0000000..25f649e --- /dev/null +++ b/clean.sh @@ -0,0 +1,11 @@ +#!/bin/sh +set -e +. ./config.sh + +for PROJECT in $PROJECTS; do + (cd $PROJECT && $MAKE clean) +done + +rm -rf sysroot +rm -rf isodir +rm -rf rockos.iso diff --git a/config.sh b/config.sh new file mode 100755 index 0000000..6299fc0 --- /dev/null +++ b/config.sh @@ -0,0 +1,28 @@ +SYSTEM_HEADER_PROJECTS="libc kernel" +PROJECTS="libc kernel" + +export MAKE=${MAKE:-make} +export HOST=${HOST:-$(./default-host.sh)} + +export AR=${HOST}-ar +export AS=${HOST}-as +export CC=${HOST}-gcc + +export PREFIX=/usr +export EXEC_PREFIX=$PREFIX +export BOOTDIR=/boot +export LIBDIR=$EXEC_PREFIX/lib +export INCLUDEDIR=$PREFIX/include + +export CFLAGS='-O3 -g' +export CPPFLAGS='' + +# Configure the cross-compiler to use the desired system root. +export SYSROOT="$(pwd)/sysroot" +export CC="$CC --sysroot=$SYSROOT" + +# Work around that the -elf gcc targets doesn't have a system include directory +# because it was configured with --without-headers rather than --with-sysroot. +if echo "$HOST" | grep -Eq -- '-elf($|-)'; then + export CC="$CC -isystem=$INCLUDEDIR" +fi diff --git a/default-host.sh b/default-host.sh new file mode 100755 index 0000000..7e0f795 --- /dev/null +++ b/default-host.sh @@ -0,0 +1,2 @@ +#!/bin/sh +echo i686-elf diff --git a/headers.sh b/headers.sh new file mode 100755 index 0000000..0de6fd0 --- /dev/null +++ b/headers.sh @@ -0,0 +1,9 @@ +#!/bin/sh +set -e +. ./config.sh + +mkdir -p "$SYSROOT" + +for PROJECT in $SYSTEM_HEADER_PROJECTS; do + (cd $PROJECT && DESTDIR="$SYSROOT" $MAKE install-headers) +done diff --git a/iso.sh b/iso.sh new file mode 100755 index 0000000..565c179 --- /dev/null +++ b/iso.sh @@ -0,0 +1,15 @@ +#!/bin/sh +set -e +. ./build.sh + +mkdir -p isodir +mkdir -p isodir/boot +mkdir -p isodir/boot/grub + +cp sysroot/boot/rockos.kernel isodir/boot/rockos.kernel +cat > isodir/boot/grub/grub.cfg << EOF +menuentry "rockOS" { + multiboot /boot/rockos.kernel +} +EOF +grub2-mkrescue -o rockos.iso isodir diff --git a/kernel/.gitignore b/kernel/.gitignore new file mode 100644 index 0000000..9290cdf --- /dev/null +++ b/kernel/.gitignore @@ -0,0 +1,3 @@ +*.d +*.kernel +*.o diff --git a/kernel/Makefile b/kernel/Makefile new file mode 100644 index 0000000..9f9e3e8 --- /dev/null +++ b/kernel/Makefile @@ -0,0 +1,83 @@ +DEFAULT_HOST!=../default-host.sh +HOST?=DEFAULT_HOST +HOSTARCH!=../target-triplet-to-arch.sh $(HOST) + +CFLAGS?=-O3 -g +CPPFLAGS?= +LDFLAGS?= +LIBS?= + +DESTDIR?= +PREFIX?=/usr/local +EXEC_PREFIX?=$(PREFIX) +BOOTDIR?=$(EXEC_PREFIX)/boot +INCLUDEDIR?=$(PREFIX)/include + +CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra +CPPFLAGS:=$(CPPFLAGS) -D__is_kernel -Iinclude +LDFLAGS:=$(LDFLAGS) +LIBS:=$(LIBS) -nostdlib -lk -lgcc + +ARCHDIR=arch/$(HOSTARCH) + +include $(ARCHDIR)/make.config + +CFLAGS:=$(CFLAGS) $(KERNEL_ARCH_FLAGS) +CPPFLAGS:=$(CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS) +LDFLAGS:=$(LDFLAGS) $(KERNEL_ARCH_LDFLAGS) +LIBS:=$(LIBS) $(KERNEL_ARCH_LIBS) + +KERNEL_OBJS=\ +$(KERNEL_ARCH_OBJS) \ +kernel/kernel.o \ + +OBJS=\ +$(ARCHDIR)/crti.o \ +$(ARCHDIR)/crtbegin.o \ +$(KERNEL_OBJS) \ +$(ARCHDIR)/crtend.o \ +$(ARCHDIR)/crtn.o \ + +LINK_LIST=\ +$(LDFLAGS) \ +$(ARCHDIR)/crti.o \ +$(ARCHDIR)/crtbegin.o \ +$(KERNEL_OBJS) \ +$(LIBS) \ +$(ARCHDIR)/crtend.o \ +$(ARCHDIR)/crtn.o \ + +.PHONY: all clean install install-headers install-kernel +.SUFFIXES: .o .c .S + +all: rockos.kernel + +rockos.kernel: $(OBJS) $(ARCHDIR)/linker.ld + $(CC) -T $(ARCHDIR)/linker.ld -o $@ $(CFLAGS) $(LINK_LIST) + grub2-file --is-x86-multiboot rockos.kernel + +$(ARCHDIR)/crtbegin.o $(ARCHDIR)/crtend.o: + OBJ=`$(CC) $(CFLAGS) $(LDFLAGS) -print-file-name=$(@F)` && cp "$$OBJ" $@ + +.c.o: + $(CC) -MD -c $< -o $@ -std=gnu11 $(CFLAGS) $(CPPFLAGS) + +.S.o: + $(CC) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS) + +clean: + rm -f rockos.kernel + rm -f $(OBJS) *.o */*.o */*/*.o + rm -f $(OBJS:.o=.d) *.d */*.d */*/*.d + +install: install-headers install-kernel + +install-headers: + mkdir -p $(DESTDIR)$(INCLUDEDIR) + cp -R --preserve=timestamps include/. $(DESTDIR)$(INCLUDEDIR)/. + +install-kernel: rockos.kernel + mkdir -p $(DESTDIR)$(BOOTDIR) + cp rockos.kernel $(DESTDIR)$(BOOTDIR) + +-include $(OBJS:.o=.d) diff --git a/kernel/arch/i386/boot.S b/kernel/arch/i386/boot.S new file mode 100644 index 0000000..dca9994 --- /dev/null +++ b/kernel/arch/i386/boot.S @@ -0,0 +1,34 @@ +# Declare constants for multiboot header +.set ALIGN, 1<<0 # align loaded modules on page boundaries +.set MEMINFO, 1<<1 # provide memory map +.set FLAGS, ALIGN | MEMINFO # multiboot flag field +.set MAGIC, 0x1BADB002 # magic number for bootloader to find header +.set CHECKSUM, -(MAGIC + FLAGS) # checksum of above + +# Declare header in multiboot standard +.section .multiboot +.align 4 +.long MAGIC +.long FLAGS +.long CHECKSUM + +# Reserve a stack for initial thread +.section .bss +.align 16 +stack_bottom: +.skip 16384 # 16 KiB +stack_top: + +# kernel entry point +.section .text +.global _start +.type _start, @function +_start: + movl $stack_top, %esp + call _init # call global constructors + call kernel_main # transfer control to main kernel + # Hang if kernel_main unexpectedly returns + cli +1: hlt + jmp 1b +.size _start, . - _start diff --git a/kernel/arch/i386/crti.S b/kernel/arch/i386/crti.S new file mode 100644 index 0000000..687f7db --- /dev/null +++ b/kernel/arch/i386/crti.S @@ -0,0 +1,13 @@ +.section .init +.global _init +.type _init, @function +_init: + push %ebp + movl %esp, %ebp + +.section .fini +.global _fini +.type _fini, @function +_fini: + push %ebp + movl %esp, %ebp diff --git a/kernel/arch/i386/crtn.S b/kernel/arch/i386/crtn.S new file mode 100644 index 0000000..7c3c29d --- /dev/null +++ b/kernel/arch/i386/crtn.S @@ -0,0 +1,7 @@ +.section .init + popl %ebp + ret + +.section .fini + popl %ebp + ret diff --git a/kernel/arch/i386/linker.ld b/kernel/arch/i386/linker.ld new file mode 100644 index 0000000..7569f55 --- /dev/null +++ b/kernel/arch/i386/linker.ld @@ -0,0 +1,28 @@ +ENTRY(_start) + +SECTIONS +{ + . = 1M; + + .text BLOCK(4K) : ALIGN(4K) + { + *(.multiboot) + *(.text) + } + + .rodata BLOCK(4K) : ALIGN(4K) + { + *(.rodata) + } + + .data BLOCK(4K) : ALIGN(4K) + { + *(.data) + } + + .bss BLOCK(4K) : ALIGN(4K) + { + *(COMMON) + *(.bss) + } +} diff --git a/kernel/arch/i386/make.config b/kernel/arch/i386/make.config new file mode 100644 index 0000000..c4fb501 --- /dev/null +++ b/kernel/arch/i386/make.config @@ -0,0 +1,8 @@ +KERNEL_ARCH_CFLAGS= +KERNEL_ARCH_CPPFLAGS= +KERNEL_ARCH_LDFLAGS= +KERNEL_ARCH_LIBS= + +KERNEL_ARCH_OBJS=\ +$(ARCHDIR)/boot.o \ +$(ARCHDIR)/tty.o \ diff --git a/kernel/arch/i386/tty.c b/kernel/arch/i386/tty.c new file mode 100644 index 0000000..61d9d68 --- /dev/null +++ b/kernel/arch/i386/tty.c @@ -0,0 +1,62 @@ +#include +#include +#include +#include + +#include + +#include "vga.h" + +static const size_t VGA_WIDTH = 80; +static const size_t VGA_HEIGHT = 25; +static uint16_t* const VGA_MEMORY = (uint16_t*) 0xB8000; + +static size_t terminal_row; +static size_t terminal_column; +static uint8_t terminal_color; +static uint16_t* terminal_buffer; + +void terminal_initialize(void) { + terminal_row = 0; + terminal_column = 0; + terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK); + terminal_buffer = VGA_MEMORY; + for (size_t y = 0; y < VGA_HEIGHT; y++) { + for (size_t x = 0; x < VGA_WIDTH; x++) { + const size_t index = y * VGA_WIDTH + x; + terminal_buffer[index] = vga_entry(' ', terminal_color); + } + } +} + +void terminal_setcolor(uint8_t color) { + terminal_color = color; +} + +void terminal_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) { + const size_t index = y * VGA_WIDTH + x; + terminal_buffer[index] = vga_entry(c, color); +} + +void terminal_putchar(char c) { + unsigned char uc = c; + + terminal_putentryat(uc, terminal_color, terminal_column, terminal_row); + + if (++terminal_column == VGA_WIDTH) { + terminal_column = 0; + if (++terminal_row == VGA_HEIGHT) { + terminal_row = 0; + } + } +} + +void terminal_write(const char* data, size_t size) { + for (size_t i = 0; i < size; i++) { + terminal_putchar(data[i]); + } +} + +void terminal_writestring(const char* data) { + terminal_write(data, strlen(data)); +} diff --git a/kernel/arch/i386/vga.h b/kernel/arch/i386/vga.h new file mode 100644 index 0000000..ff82c19 --- /dev/null +++ b/kernel/arch/i386/vga.h @@ -0,0 +1,33 @@ +#ifndef ARCH_I386_VGA_H +#define ARCH_I386_VGA_H + +#include + +enum vga_color { + VGA_COLOR_BLACK = 0, + VGA_COLOR_BLUE = 1, + VGA_COLOR_GREEN = 2, + VGA_COLOR_CYAN = 3, + VGA_COLOR_RED = 4, + VGA_COLOR_MAGENTA = 5, + VGA_COLOR_BROWN = 6, + VGA_COLOR_LIGHT_GREY = 7, + VGA_COLOR_DARK_GREY = 8, + VGA_COLOR_LIGHT_BLUE = 9, + VGA_COLOR_LIGHT_GREEN = 10, + VGA_COLOR_LIGHT_CYAN = 11, + VGA_COLOR_LIGHT_RED = 12, + VGA_COLOR_LIGHT_MAGENTA = 13, + VGA_COLOR_LIGHT_BROWN = 14, + VGA_COLOR_WHITE = 15, +}; + +static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg) { + return fg | bg << 4; +} + +static inline uint16_t vga_entry(unsigned char uc, uint8_t color) { + return (uint16_t) uc | (uint16_t) color << 8; +} + +#endif diff --git a/kernel/include/kernel/tty.h b/kernel/include/kernel/tty.h new file mode 100644 index 0000000..f5d7329 --- /dev/null +++ b/kernel/include/kernel/tty.h @@ -0,0 +1,11 @@ +#ifndef _KERNEL_TTY_H +#define _KERNEL_TTY_H + +#include + +void terminal_initialize(void); +void terminal_putchar(char c); +void terminal_write(const char* data, size_t size); +void terminal_writestring(const char* data); + +#endif diff --git a/kernel/kernel/kernel.c b/kernel/kernel/kernel.c new file mode 100644 index 0000000..7a752a6 --- /dev/null +++ b/kernel/kernel/kernel.c @@ -0,0 +1,8 @@ +#include + +#include + +void kernel_main(void) { + terminal_initialize(); + printf("Hello, kernel World!\n"); +} diff --git a/libc/.gitignore b/libc/.gitignore new file mode 100644 index 0000000..268e074 --- /dev/null +++ b/libc/.gitignore @@ -0,0 +1,3 @@ +*.a +*.d +*.o diff --git a/libc/Makefile b/libc/Makefile new file mode 100644 index 0000000..ce70b46 --- /dev/null +++ b/libc/Makefile @@ -0,0 +1,93 @@ +DEFAULT_HOST!=../default-host.sh +HOST?=DEFAULT_HOST +HOSTARCH!=../target-triplet-to-arch.sh $(HOST) + +CFLAGS?=-O3 -g +CPPFLAGS?= +LDFLAGS?= +LIBS?= + +DESTDIR?= +PREFIX?=/usr/local +EXEC_PREFIX?=$(PREFIX) +INCLUDEDIR?=$(PREFIX)/include +LIBDIR?=$(EXEC_PREFIX)/lib + +CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra +CPPFLAGS:=$(CPPFLAGS) -D__is_libc -Iinclude +LIBK_CFLAGS:=$(CFLAGS) +LIBK_CPPFLAGS:=$(CPPFLAGS) -D__is_libk + +ARCHDIR=arch/$(HOSTARCH) + +include $(ARCHDIR)/make.config + +CFLAGS:=$(CFLAGS) $(ARCH_CFLAGS) +CPPFLAGS:=$(CPPFLAGS) $(ARCH_CPPFLAGS) +LIBK_CFLAGS:=$(LIBK_CFLAGS) $(KERNEL_ARCH_CFLAGS) +LIBK_CPPFLAGS:=$(LIBK_CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS) + +FREEOBJS=\ +$(ARCH_FREEOBJS) \ +stdio/printf.o \ +stdio/putchar.o \ +stdio/puts.o \ +stdlib/abort.o \ +string/memcmp.o \ +string/memcpy.o \ +string/memmove.o \ +string/memset.o \ +string/strlen.o \ + +HOSTEDOBJS=\ +$(ARCH_HOSTEDOBJS) \ + +OBJS=\ +$(FREEOBJS) \ +$(HOSTEDOBJS) \ + +LIBK_OBJS=$(FREEOBJS:.o=.libk.o) + +#BINARIES=libc.a libk.a # Not ready for libc yet. +BINARIES=libk.a + +.PHONY: all clean install install-headers install-libs +.SUFFIXES: .o .libk.o .c .S + +all: $(BINARIES) + +libc.a: $(OBJS) + $(AR) rcs $@ $(OBJS) + +libk.a: $(LIBK_OBJS) + $(AR) rcs $@ $(LIBK_OBJS) + +.c.o: + $(CC) -MD -c $< -o $@ -std=gnu11 $(CFLAGS) $(CPPFLAGS) + +.c.S: + $(CC) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS) + +.c.libk.o: + $(CC) -MD -c $< -o $@ -std=gnu11 $(LIBK_CFLAGS) $(LIBK_CPPFLAGS) + +.S.libk.o: + $(CC) -MD -c $< -o $@ $(LIBK_CFLAGS) $(LIBK_CPPFLAGS) + +clean: + rm -f $(BINARIES) *.a + rm -f $(OBJS) $(LIBK_OBJS) *.o */*.o */*/*.o + rm -f $(OBJS:.o=.d) $(LIBK_OBJS:.o=.d) *.d */*.d */*/*.d + +install: install-headers install-libs + +install-headers: + mkdir -p $(DESTDIR)$(INCLUDEDIR) + cp -R --preserve=timestamps include/. $(DESTDIR)$(INCLUDEDIR)/. + +install-libs: $(BINARIES) + mkdir -p $(DESTDIR)$(LIBDIR) + cp $(BINARIES) $(DESTDIR)$(LIBDIR) + +-include $(OBJS:.o=.d) +-include $(LIBK_OBJS:.o=.d) diff --git a/libc/arch/i386/make.config b/libc/arch/i386/make.config new file mode 100644 index 0000000..c0206ff --- /dev/null +++ b/libc/arch/i386/make.config @@ -0,0 +1,8 @@ +ARCH_CFLAGS= +ARCH_CPPFLAGS= +KERNEL_ARCH_CFLAGS= +KERNEL_ARCH_CPPFLAGS= + +ARCH_FREEOBJS=\ + +ARCH_HOSTEDOBJS=\ diff --git a/libc/include/stdio.h b/libc/include/stdio.h new file mode 100644 index 0000000..b3be14e --- /dev/null +++ b/libc/include/stdio.h @@ -0,0 +1,20 @@ +#ifndef _STDIO_H +#define _STDIO_H 1 + +#include + +#define EOF (-1) + +#ifdef __cplusplus +extern "C" { +#endif + +int printf(const char* __restrict, ...); +int putchar(int); +int puts(const char*); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h new file mode 100644 index 0000000..106802f --- /dev/null +++ b/libc/include/stdlib.h @@ -0,0 +1,17 @@ +#ifndef _STDLIB_H +#define _STDLIB_H 1 + +#include + +#ifdef __cplusplus +extern "C" { +#endif + +__attribute__((__noreturn__)) +void abort(void); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/libc/include/string.h b/libc/include/string.h new file mode 100644 index 0000000..31a6266 --- /dev/null +++ b/libc/include/string.h @@ -0,0 +1,21 @@ +#ifndef _STRING_H +#define _STRING_H 1 + +#include +#include + +#ifdef __cplusplus +extern "C" { +#endif + +int memcmp(const void*, const void*, size_t); +void* memcpy(void* __restrict, const void* __restrict, size_t); +void* memmove(void*, const void*, size_t); +void* memset(void*, int, size_t); +size_t strlen(const char*); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h new file mode 100644 index 0000000..3ed5570 --- /dev/null +++ b/libc/include/sys/cdefs.h @@ -0,0 +1,6 @@ +#ifndef _SYS_CDEFS_H +#define _SYS_CDEFS_H 1 + +#define __rockos_libc 1 + +#endif diff --git a/libc/stdio/printf.c b/libc/stdio/printf.c new file mode 100644 index 0000000..dff217d --- /dev/null +++ b/libc/stdio/printf.c @@ -0,0 +1,88 @@ +#include +#include +#include +#include +#include + +static bool print(const char* data, size_t length) { + const unsigned char* bytes = (const unsigned char*) data; + for (size_t i = 0; i < length; i++) { + if (putchar(bytes[i]) == EOF) { + return false; + } + } + return true; +} + +int printf(const char* restrict format, ...) { + va_list parameters; + va_start(parameters, format); + + int written = 0; + + while (*format != '\0') { + size_t maxrem = INT_MAX - written; + + if (format[0] != '%' || format[1] == '%') { + if (format[0] == '%') { + format++; + } + size_t amount = 1; + while (format[amount] && format[amount] != '%') { + amount++; + } + if (maxrem < amount) { + // TODO: Set errno to EOVERFLOW. + return -1; + } + if (!print(format, amount)) { + return -1; + } + format += amount; + written += amount; + continue; + } + + const char* format_begun_at = format++; + + if (*format == 'c') { + format++; + char c = (char) va_arg(parameters, int); + if (!maxrem) { + // TODO: Set errno to EOVERFLOW + return -1; + } + if (!print(&c, sizeof(c))) { + return -1; + } + written++; + } else if (*format == 's') { + format ++; + const char* str = va_arg(parameters, const char*); + size_t len = strlen(str); + if (maxrem < len) { + // TODO: Set errno to EOVERFLOW + return -1; + } + if (!print(str, len)) { + return -1; + } + written += len; + } else { + format = format_begun_at; + size_t len = strlen(format); + if (maxrem < len) { + // TODO: Set errno to EOVERFLOW + return -1; + } + if (!print(format, len)) { + return -1; + } + written += len; + format += len; + } + } + + va_end(parameters); + return written; +} diff --git a/libc/stdio/putchar.c b/libc/stdio/putchar.c new file mode 100644 index 0000000..47be92b --- /dev/null +++ b/libc/stdio/putchar.c @@ -0,0 +1,15 @@ +#include + +#if defined(__is_libk) +#include +#endif + +int putchar(int ic) { +#if defined(__is_libk) + char c = (char) ic; + terminal_write(&c, sizeof(c)); +#else + // TODO: Implement stdio and the write system call. +#endif + return ic; +} diff --git a/libc/stdio/puts.c b/libc/stdio/puts.c new file mode 100644 index 0000000..e835465 --- /dev/null +++ b/libc/stdio/puts.c @@ -0,0 +1,5 @@ +#include + +int puts(const char* string) { + return printf("%s\n", string); +} diff --git a/libc/stdlib/abort.c b/libc/stdlib/abort.c new file mode 100644 index 0000000..adf144a --- /dev/null +++ b/libc/stdlib/abort.c @@ -0,0 +1,16 @@ +#include +#include + +__attribute__((__noreturn__)) +void abort(void) { + #if defined(__is_libk) + // TODO: Add proper kernel panic. + printf("kernel: panic: abort()\n"); + asm volatile("hlt"); + #else + // TODO: Abnormally terminate the process as if by SIGABRT. + printf("abort()\n"); + #endif + while (1) {} + __builtin_unreachable(); +} diff --git a/libc/string/memcmp.c b/libc/string/memcmp.c new file mode 100644 index 0000000..f528461 --- /dev/null +++ b/libc/string/memcmp.c @@ -0,0 +1,14 @@ +#include + +int memcmp(const void* aptr, const void* bptr, size_t size) { + const unsigned char* a = (const unsigned char*) aptr; + const unsigned char* b = (const unsigned char*) bptr; + for (size_t i = 0; i < size; i++) { + if (a[i] < b[i]) { + return -1; + } else if (b[i] < a[i]) { + return 1; + } + } + return 0; +} diff --git a/libc/string/memcpy.c b/libc/string/memcpy.c new file mode 100644 index 0000000..92e8e5e --- /dev/null +++ b/libc/string/memcpy.c @@ -0,0 +1,10 @@ +#include + +void* memcpy(void* restrict dstptr, const void* restrict srcptr, size_t size) { + unsigned char* dst = (unsigned char*) dstptr; + const unsigned char* src = (const unsigned char*) srcptr; + for (size_t i = 0; i < size; i++) { + dst[i] = src[i]; + } + return dstptr; +} diff --git a/libc/string/memmove.c b/libc/string/memmove.c new file mode 100644 index 0000000..9f8ad9f --- /dev/null +++ b/libc/string/memmove.c @@ -0,0 +1,17 @@ +#include + +void* memmove (void* dstptr, const void* srcptr, size_t size) { + unsigned char* dst = (unsigned char*) dstptr; + const unsigned char* src = (const unsigned char*) srcptr; + + if (dst < src) { + for (size_t i = 0; i < size; i++) { + dst[i] = src[i]; + } + } else { + for (size_t i = size; i != 0; i--) { + dst[i-1] = src[i-1]; + } + } + return dstptr; +} diff --git a/libc/string/memset.c b/libc/string/memset.c new file mode 100644 index 0000000..8b9ef33 --- /dev/null +++ b/libc/string/memset.c @@ -0,0 +1,9 @@ +#include + +void* memset(void* bufptr, int value, size_t size) { + unsigned char* buf = (unsigned char*) bufptr; + for (size_t i = 0; i < size; i++) { + buf[i] = (unsigned char) value; + } + return bufptr; +} diff --git a/libc/string/strlen.c b/libc/string/strlen.c new file mode 100644 index 0000000..de1978c --- /dev/null +++ b/libc/string/strlen.c @@ -0,0 +1,9 @@ +#include + +size_t strlen(const char* str) { + size_t len = 0; + while (str[len]) { + len++; + } + return len; +} diff --git a/qemu.sh b/qemu.sh new file mode 100755 index 0000000..4c05b4a --- /dev/null +++ b/qemu.sh @@ -0,0 +1,5 @@ +#!/bin/sh +set -e +. ./iso.sh + +qemu-system-$(./target-triplet-to-arch.sh $HOST) -cdrom rockos.iso diff --git a/target-triplet-to-arch.sh b/target-triplet-to-arch.sh new file mode 100755 index 0000000..caa9c95 --- /dev/null +++ b/target-triplet-to-arch.sh @@ -0,0 +1,6 @@ +#!/bin/sh +if echo "$1" | grep -Eq 'i[[:digit:]]86-'; then + echo i386 +else + echo "$1" | grep -Eo '^[[:alnum:]_]*' +fi