310555002 lab2

.gdb_history

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+target remote:1234
+file lab3/build/kernel8.elf
+x/gx deubg
+x/gx debug
+b log_kernel_start
+c
+x/gx 0x87004
+x/gx 0x87004 - 0x10
+x/gx 0x87004 - 0x20
+x/gx 0x87004 - 0x100
+quit
+target remote:1234
+file ./lab3/build/kernel8.elf
+x/gx 0x87004
+x/gx 0x87004
+watch *0x87004
+c
+x/gx 0x87004
+quit
+file 
+ls
+file lab5/build/kernel8.elf
+file 0x881e4
+x/i 0x881e4
+target remote:1234
+x/i 0x881e4
+quit

lab0/Start.S

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+.section ".text"
+_start:
+  wfe
+  b _start

lab0/kernel8.img

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+_ ����

lab0/linker.ld

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+SECTIONS
+{
+  . = 0x80000;
+  .text : { *(.text) }
+}

lab1/.gdb_history

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+file ./build/kernel8.elf 
+target remote :1234
+ni
+quit
+file ./build/kernel8.elf 
+target remote :1234
+ni
+ni
+ni
+ni
+target remote :1234
+target remote :1234
+ni
+ni
+ni
+quit
+file ./build/kernel8.elf 
+target remote :1234
+ni
+quit
+file ./build/kernel8.elf 
+target remote :1234
+ni
+b *0x80028
+c
+x/gx 0x81330
+b *0x80028
+quit
+quit
+file ./build/kernel8.elf 
+target remote :1234
+c
+c
+x/gx MBox_buf
+x/gx MBox_write 
+b * 0x80360
+c
+mailbox
+target remote :1234
+b * 0x80360
+del 1
+c
+ni
+qquit
+quit
+file ./build/kernel8..efl
+file ./build/kernel8..elf
+file ./build/kernel8.elf
+target remote :1234
+b MBox_write
+c
+ni
+x/gx 0x3f00b880 + 0x1b
+x/gx 0x3f00b880 + 0x10
+x/gx 0x3f00b880 + 0x1b
+x/gx 0x3f00b880 + 0x1c
+x/gx 0x3f00b880 + 0x1b
+x/gx 0x3f00b880 + 0x1e
+x/gx 0x3f00b880 + 0x1f
+x/gx 0x3f00b880 + 0x1a
+x/gx 0x3f00b880 + 0x1b
+x/gx 0x3f00b880 + 0x1c
+x/gx 0x3f00b880 + 0x1b
+disassemble MBox_write 
+disassemble MBox_write 
+disassemble MBox_write 
+ls

lab1/Makefile

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+CC = aarch64-linux-gnu-gcc
+CPP = aarch64-linux-gnu-cpp
+override CFLAGS += \
+        -nostdlib \
+        -nodefaultlibs \
+        -ffreestanding \
+        -nostartfiles \
+        -mgeneral-regs-only \
+        -fno-builtin \
+
+LDFLAGS ?= \
+        -nostdlib \
+
+CXXFLAGS =
+LD = aarch64-linux-gnu-ld
+OBJCOPY = aarch64-linux-gnu-objcopy
+OBJDUMP = aarch64-linux-gnu-objdump
+QEMU = qemu-system-aarch64
+RASPI_VER = raspi3b
+
+
+LINKER_FILE = ./linker.ld
+HEADERS = $(PWD)/include/
+OUTPUT = $(PWD)/build
+KNAME = $(OUTPUT)/kernel8
+
+LIBS = \
+	 $(OUTPUT)/print.o \
+	 $(OUTPUT)/string.o \
+
+OBJECTS = \
+		$(OUTPUT)/boot.o \
+		$(OUTPUT)/mini_uart.o \
+		$(OUTPUT)/mailbox.o \
+		$(OUTPUT)/main.o \
+		$(OUTPUT)/kernel_init.o \
+		$(OUTPUT)/reboot.o \
+		$(OUTPUT)/shell.o \
+		$(OUTPUT)/debug.o \
+		$(LIBS)
+
+
+.PHONY: all start objects link kernel end clean dump
+
+
+all: start objects link kernel end
+
+start: 
+	@echo "Start building kernel8.img"
+
+objects: 
+	$(MAKE) -C boot OUTPUT=$(OUTPUT) HEADERS=$(HEADERS) CFLAGS="$(CFLAGS)" 
+	$(MAKE) -C peripherals OUTPUT=$(OUTPUT) HEADERS=$(HEADERS) CFLAGS="$(CFLAGS)" 
+	$(MAKE) -C init OUTPUT=$(OUTPUT) HEADERS=$(HEADERS) CFLAGS="$(CFLAGS)"
+	$(MAKE) -C kernel OUTPUT=$(OUTPUT) HEADERS=$(HEADERS) CFLAGS="$(CFLAGS)" 
+	$(MAKE) -C lib OUTPUT=$(OUTPUT) HEADERS=$(HEADERS) CFLAGS="$(CFLAGS)" 
+	$(MAKE) -C debug OUTPUT=$(OUTPUT) HEADERS=$(HEADERS) CFLAGS="$(CFLAGS)" 
+
+link: $(OBJECTS)
+	$(LD) -T $(LINKER_FILE) -o $(KNAME).elf $(OBJECTS) $(LDFLAGS)
+
+kernel: $(KNAME).elf
+	$(OBJCOPY) -O binary $(KNAME).elf $(KNAME).img
+
+end: 
+	@echo "Finish building kernel8.img"
+
+dump: 
+	$(OBJDUMP) -m aarch64 -b binary -D $(KNAME).img
+
+qemu-run: 
+	sudo $(QEMU) -M $(RASPI_VER) -kernel $(KNAME).img -display none -serial null -serial stdio
+
+qemu-run-instr: 
+	sudo $(QEMU) -M $(RASPI_VER) -kernel $(KNAME).img -display none -d in_asm 
+
+clean: 
+	rm $(OUTPUT)/*

lab1/README.md

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+# Requirements
+
+## Features
+
+- Basic Exercise 1
+    - [x] All it’s data is presented at correct memory address. (In linker.ld)
+    - [x] The program counter is set to correct memory address. (In linker.ld)
+    - [x] The bss segment are initialized to 0.                 (In boot/boot.S)
+    - [x] The stack pointer is set to a proper address.         (In boot/boot.S)
+- Basic Exercise 2
+    - [x] Mini UART     (In peripherals/mini_uart.c)
+- Basic Exercise 3      
+    - [x] Simple Shell  (In kernel/shell.c) 
+- Basic Exercise 4
+    - [x] Mailbox       (In peripherals/mailbox.c)
+- Advanced Exercise 1
+    - [x] Reboot        (In kernel/reboot.c)
+

lab1/boot/Makefile

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+CC = aarch64-linux-gnu-gcc
+CPP = aarch64-linux-gnu-cpp
+CFLAGS ?= \
+        -nostdlib \
+        -nodefaultlibs \
+        -ffreestanding \
+        -nostartfiles \
+        -mgeneral-regs-only \
+        -fno-builtin
+
+CXXFLAGS =
+
+OUTPUT ?= .
+OBJECTS = \
+		boot.o
+
+all: $(OBJECTS) 
+
+%.o: %.S
+	$(CC) -c $^ -o $(OUTPUT)/$@
+
+clean:
+	rm $(OUTPUT)/$(OBJECTS)

lab1/boot/boot.S

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+.section ".text.boot"
+.global _start
+_start:
+    // read cpu id, stop slave cores
+    mrs     x1, mpidr_el1
+    and     x1, x1, #0xff
+
+    // cpu id > 0, stop
+    cbz     x1, master_core 
+
+proc_hang:  
+	wfe
+    b       proc_hang
+
+// cpu id == 0
+master_core:
+// stack 
+    adr     x1, _start
+    mov     sp, x1
+// initialize .bss section
+    ldr     x1, =__bss_start
+    ldr     x2, =__bss_end
+bss_zero:
+    sub     x3, x2, x1
+    cbz     x3, end 
+    str     xzr, [x1], #8 // store zero to [x1] and add 8 to x1
+    b bss_zero
+
+end:
+// jump to kernel_main
+    bl      kernel_main
+    b       proc_hang

lab1/debug.sh

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+#!/bin/sh
+make CFLAGS=-DDEBUG >/dev/null
+make qemu-run

lab1/debug/Makefile

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+CC = aarch64-linux-gnu-gcc
+CPP = aarch64-linux-gnu-cpp
+CFLAGS ?= \
+        -nostdlib \
+        -nodefaultlibs \
+        -ffreestanding \
+        -nostartfiles \
+        -mgeneral-regs-only \
+        -fno-builtin
+
+CXXFLAGS =
+
+OUTPUT ?= .
+HEADERS ?= ../include
+LIBS = \
+	 debug.o
+
+all: $(LIBS) 
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) -o $(OUTPUT)/$@ $^ -I$(HEADERS)
+
+
+
+clean:
+	rm $(OUTPUT)/$(LIBS)