mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-09 07:06:47 +00:00
🆕 加载elf文件
This commit is contained in:
fslongjin
parent
b0a7ec633d
commit
5df5d79900
5
.vscode/settings.json
vendored
5
.vscode/settings.json
vendored
@ -95,7 +95,10 @@
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"types.h": "c",
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"string.h": "c",
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"math.h": "c",
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"ipi.h": "c"
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"ipi.h": "c",
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"arch.h": "c",
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"elf.h": "c",
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"stdio.h": "c"
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},
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"C_Cpp.errorSquiggles": "Enabled",
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"esbonio.sphinx.confDir": ""
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@ -1,4 +1,4 @@
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SUBDIR_ROOTS := . common
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SUBDIR_ROOTS := .
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DIRS := . $(shell find $(SUBDIR_ROOTS) -type d)
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GARBAGE_PATTERNS := *.o *.s~ *.s *.S~ *.c~ *.h~ kernel
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GARBAGE := $(foreach DIR,$(DIRS),$(addprefix $(DIR)/,$(GARBAGE_PATTERNS)))
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@ -10,7 +10,7 @@ LIB_FILES := $(foreach DIR,$(DIR_LIB),$(addprefix $(DIR)/,$(lib_patterns)))
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# 控制操作系统使用的中断控制器 _INTR_8259A_ _INTR_APIC_
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PIC := _INTR_APIC_
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CFLAGS = $(GLOBAL_CFLAGS) -D $(PIC) -I .
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CFLAGS = $(GLOBAL_CFLAGS) -D $(PIC) -I $(shell pwd)
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ASFLAGS := --64
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@ -18,6 +18,11 @@ LD_LIST := head.o
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OBJ_LIST := head.o
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kernel_subdirs := common/libELF
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head.o: head.S
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gcc -E head.S > head.s # 预处理
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@ -143,17 +148,21 @@ uart.o: driver/uart/uart.c
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gcc $(CFLAGS) -c driver/uart/uart.c -o driver/uart/uart.o
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all: kernel
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ld -b elf64-x86-64 -z muldefs -o kernel head.o main.o $(shell find . -name "*.o") -T link.lds
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objcopy -I elf64-x86-64 -O elf64-x86-64 -R ".comment" -R ".eh_frame" kernel ../bin/kernel/kernel.elf
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#
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kernel: head.o entry.o procs.o main.o printk.o trap.o mm.o slab.o irq.o pic.o process.o sched.o syscall.o multiboot2.o cpu.o acpi.o ps2_keyboard.o ps2_mouse.o ata.o pci.o ahci.o smp.o apu_boot.o rtc.o HPET.o softirq.o timer.o fat32.o MBR.o VFS.o $(OBJ_LIST)
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ld -b elf64-x86-64 -z muldefs -o kernel head.o exception/entry.o process/procs.o main.o common/printk.o exception/trap.o exception/irq.o mm/mm.o mm/slab.o process/process.o syscall/syscall.o driver/multiboot2/multiboot2.o \
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common/cpu.o smp/smp.o smp/apu_boot.o exception/softirq.o sched/sched.o filesystem/fat32/fat32.o filesystem/MBR.o filesystem/VFS/VFS.o \
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driver/acpi/acpi.o driver/interrupt/pic.o driver/keyboard/ps2_keyboard.o driver/mouse/ps2_mouse.o driver/disk/ata.o driver/pci/pci.o driver/disk/ahci/ahci.o driver/timers/rtc/rtc.o driver/timers/HPET/HPET.o driver/timers/timer.o \
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$(LD_LIST) \
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-T link.lds
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@list='$(kernel_subdirs)'; for subdir in $$list; do \
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echo "make all in $$subdir";\
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cd $$subdir;\
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$(MAKE) all CFLAGS="$(CFLAGS)";\
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cd ..;\
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done
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clean:
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12
kernel/common/Makefile
Normal file
12
kernel/common/Makefile
Normal file
@ -0,0 +1,12 @@
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CFLAGS += -I .
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kernel_common_subdirs:=libELF
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all:
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@list='$(kernel_common_subdirs)'; for subdir in $$list; do \
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echo "make all in $$subdir";\
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cd $$subdir;\
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$(MAKE) all CFLAGS="$(CFLAGS) -I";\
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cd ..;\
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done
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8
kernel/common/libELF/Makefile
Normal file
8
kernel/common/libELF/Makefile
Normal file
@ -0,0 +1,8 @@
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all: elf.o
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CFLAGS += -I .
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elf.o: elf.c
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gcc $(CFLAGS) -c elf.c -o elf.o
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@ -845,7 +845,7 @@ long fat32_lseek(struct vfs_file_t *file_ptr, long offset, long whence)
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return -EOVERFLOW;
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file_ptr->position = pos;
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kdebug("fat32 lseek -> position=%d", file_ptr->position);
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// kdebug("fat32 lseek -> position=%d", file_ptr->position);
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return pos;
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}
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// todo: ioctl
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122
kernel/mm/mm.c
122
kernel/mm/mm.c
@ -9,6 +9,34 @@ ul Total_Memory = 0;
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ul total_2M_pages = 0;
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static ul root_page_table_phys_addr = 0; // 内核层根页表的物理地址
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/**
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* @brief 虚拟地址长度所需要的entry数量
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*
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*/
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typedef struct
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{
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uint64_t num_PML4E;
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uint64_t *num_PDPTE;
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uint64_t *num_PDE;
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uint64_t num_PTE;
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} mm_pgt_entry_num_t;
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/**
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* @brief 计算虚拟地址长度对应的页表entry数量
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*
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* @param length 长度
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* @param ent 返回的entry数量结构体
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*/
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static void mm_calculate_entry_num(uint64_t length, mm_pgt_entry_num_t *ent)
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{
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if (ent == NULL)
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return;
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ent->num_PML4E = (length + (1UL << PAGE_GDT_SHIFT) - 1) >> PAGE_GDT_SHIFT;
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ent->num_PDPTE = (length + PAGE_1G_SIZE - 1) >> PAGE_1G_SHIFT;
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ent->num_PDE = (length + PAGE_2M_SIZE - 1) >> PAGE_2M_SHIFT;
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ent->num_PTE = (length + PAGE_4K_SIZE - 1) >> PAGE_4K_SHIFT;
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}
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/**
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* @brief 从页表中获取pdt页表项的内容
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*
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@ -605,40 +633,50 @@ void mm_map_phys_addr_user(ul virt_addr_start, ul phys_addr_start, ul length, ul
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*/
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void mm_map_proc_page_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_start, ul phys_addr_start, ul length, ul flags, bool user)
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{
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// kdebug("proc_page_table_addr=%#018lx", proc_page_table_addr);
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// 计算线性地址对应的pml4页表项的地址
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ul *tmp;
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if (is_phys)
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tmp = phys_2_virt((ul *)((ul)proc_page_table_addr & (~0xfffUL)) + ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff));
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else
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tmp = (ul *)((ul)proc_page_table_addr & (~0xfffUL)) + ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff);
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mm_pgt_entry_num_t pgt_num;
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mm_calculate_entry_num(length, &pgt_num);
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kdebug("ent1=%d ent2=%d ent3=%d, ent4=%d", pgt_num.num_PML4E, pgt_num.num_PDPTE, pgt_num.num_PDE, pgt_num.num_PTE);
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if (*tmp == 0)
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uint64_t pml4e_id = ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff);
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// 循环填写顶层页表
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for (int num_pml4e = 0; num_pml4e < pgt_num.num_PML4E && pml4e_id < 512; ++num_pml4e, ++pml4e_id)
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{
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ul *virt_addr = kmalloc(PAGE_4K_SIZE, 0);
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memset(virt_addr, 0, PAGE_4K_SIZE);
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set_pml4t(tmp, mk_pml4t(virt_2_phys(virt_addr), (user ? PAGE_USER_PGT : PAGE_KERNEL_PGT)));
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}
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ul *tmp;
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if (is_phys)
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tmp = phys_2_virt((ul *)((ul)proc_page_table_addr & (~0xfffUL)) + pml4e_id);
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else
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tmp = (ul *)((ul)proc_page_table_addr & (~0xfffUL) + pml4e_id);
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tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((virt_addr_start >> PAGE_1G_SHIFT) & 0x1ff));
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if (*tmp == 0)
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{
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ul *virt_addr = kmalloc(PAGE_4K_SIZE, 0);
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memset(virt_addr, 0, PAGE_4K_SIZE);
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set_pml4t(tmp, mk_pml4t(virt_2_phys(virt_addr), (user ? PAGE_USER_PGT : PAGE_KERNEL_PGT)));
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}
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if (*tmp == 0)
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{
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ul *virt_addr = kmalloc(PAGE_4K_SIZE, 0);
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memset(virt_addr, 0, PAGE_4K_SIZE);
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set_pdpt(tmp, mk_pdpt(virt_2_phys(virt_addr), (user ? PAGE_USER_DIR : PAGE_KERNEL_DIR)));
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}
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tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((virt_addr_start >> PAGE_1G_SHIFT) & 0x1ff));
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ul *tmp1;
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// 初始化2M物理页
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for (ul i = 0; i < (length); i += PAGE_2M_SIZE)
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{
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// 计算当前2M物理页对应的pdt的页表项的物理地址
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if (*tmp == 0)
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{
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ul *virt_addr = kmalloc(PAGE_4K_SIZE, 0);
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memset(virt_addr, 0, PAGE_4K_SIZE);
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set_pdpt(tmp, mk_pdpt(virt_2_phys(virt_addr), (user ? PAGE_USER_DIR : PAGE_KERNEL_DIR)));
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}
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tmp1 = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr_start + i) >> PAGE_2M_SHIFT) & 0x1ff)));
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ul *tmp1;
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// 初始化2M物理页
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for (ul i = 0; i < (length); i += PAGE_2M_SIZE)
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{
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// 计算当前2M物理页对应的pdt的页表项的物理地址
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// 页面写穿，禁止缓存
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set_pdt(tmp1, mk_pdt((ul)phys_addr_start + i, flags | (user ? PAGE_USER_PAGE : PAGE_KERNEL_PAGE)));
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tmp1 = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr_start + i) >> PAGE_2M_SHIFT) & 0x1ff)));
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// 页面写穿，禁止缓存
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set_pdt(tmp1, mk_pdt((ul)phys_addr_start + i, flags | (user ? PAGE_USER_PAGE : PAGE_KERNEL_PAGE)));
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}
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}
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flush_tlb();
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@ -831,3 +869,37 @@ uint64_t mm_do_brk(uint64_t old_brk_end_addr, int64_t offset)
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}
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return end_addr;
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}
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/**
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* @brief 检测指定地址是否已经被映射
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*
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* @param page_table_phys_addr 页表的物理地址
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* @param virt_addr 要检测的地址
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* @return true 已经被映射
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* @return false
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*/
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bool mm_check_mapped(ul page_table_phys_addr, uint64_t virt_addr)
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{
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ul *tmp;
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tmp = phys_2_virt((ul *)((ul)page_table_phys_addr & (~0xfffUL)) + ((virt_addr >> PAGE_GDT_SHIFT) & 0x1ff));
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// pml4页表项为0
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if (*tmp == 0)
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return 0;
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tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((virt_addr >> PAGE_1G_SHIFT) & 0x1ff));
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// pdpt页表项为0
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if (*tmp == 0)
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return 0;
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// 读取pdt页表项
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tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr) >> PAGE_2M_SHIFT) & 0x1ff)));
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// todo: 增加对使用了4K页的页表的检测
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if (*tmp != 0)
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return true;
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else
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return false;
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}
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@ -379,6 +379,15 @@ void mm_map_proc_page_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_
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void mm_map_phys_addr_user(ul virt_addr_start, ul phys_addr_start, ul length, ul flags);
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/**
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* @brief 检测指定地址是否已经被映射
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*
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* @param page_table_phys_addr 页表的物理地址
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* @param virt_addr 要检测的地址
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* @return true 已经被映射
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* @return false
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*/
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bool mm_check_mapped(ul page_table_phys_addr, uint64_t virt_addr);
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/**
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* @brief 调整堆区域的大小（暂时只能增加堆区域）
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*
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@ -10,6 +10,7 @@
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#include <filesystem/fat32/fat32.h>
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#include <common/stdio.h>
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#include <process/spinlock.h>
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#include <common/libELF/elf.h>
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spinlock_t process_global_pid_write_lock; // 增加pid的写锁
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long process_global_pid = 1; // 系统中最大的pid
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@ -353,6 +354,126 @@ struct vfs_file_t *process_open_exec_file(char *path)
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return filp;
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}
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/**
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* @brief 加载elf格式的程序文件到内存中，并设置regs
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*
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* @param regs 寄存器
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* @param path 文件路径
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* @return int
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*/
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static int process_load_elf_file(struct pt_regs *regs, char *path)
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{
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int retval = 0;
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struct vfs_file_t *filp = process_open_exec_file(path);
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if ((unsigned long)filp <= 0)
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{
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kdebug("(unsigned long)filp=%d", (long)filp);
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return (unsigned long)filp;
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}
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void *buf = kmalloc(sizeof(PAGE_4K_SIZE), 0);
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uint64_t pos = 0;
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pos = filp->file_ops->lseek(filp, 0, SEEK_SET);
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retval = filp->file_ops->read(filp, (char *)buf, sizeof(Elf64_Ehdr), &pos);
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retval = 0;
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if (!elf_check(buf))
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{
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kerror("Not an ELF file: %s", path);
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retval = -ENOTSUP;
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goto load_elf_failed;
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}
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#if ARCH(X86_64)
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// 暂时只支持64位的文件
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if (((Elf32_Ehdr *)buf)->e_ident[EI_CLASS] != ELFCLASS64)
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{
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kdebug("((Elf32_Ehdr *)buf)->e_ident[EI_CLASS]=%d", ((Elf32_Ehdr *)buf)->e_ident[EI_CLASS]);
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retval = -EUNSUPPORTED;
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goto load_elf_failed;
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}
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Elf64_Ehdr ehdr = *(Elf64_Ehdr *)buf;
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// 暂时只支持AMD64架构
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if (ehdr.e_machine != EM_AMD64)
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{
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kerror("e_machine=%d", ehdr.e_machine);
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retval = -EUNSUPPORTED;
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goto load_elf_failed;
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}
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#else
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#error Unsupported architecture!
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#endif
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if (ehdr.e_type != ET_EXEC)
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{
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kdebug("ehdr->e_type=%d", ehdr.e_type);
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retval = -EUNSUPPORTED;
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goto load_elf_failed;
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}
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kdebug("e_entry=%#018lx", ehdr.e_entry);
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regs->rip = ehdr.e_entry;
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current_pcb->mm->code_addr_start = ehdr.e_entry;
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// kdebug("ehdr.e_phoff=%#018lx\t ehdr.e_phentsize=%d, ehdr.e_phnum=%d", ehdr.e_phoff, ehdr.e_phentsize, ehdr.e_phnum);
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// 将指针移动到program header处
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pos = ehdr.e_phoff;
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// 读取所有的phdr
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pos = filp->file_ops->lseek(filp, pos, SEEK_SET);
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filp->file_ops->read(filp, (char *)buf, ehdr.e_phentsize * ehdr.e_phnum, &pos);
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if ((unsigned long)filp <= 0)
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{
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kdebug("(unsigned long)filp=%d", (long)filp);
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return (unsigned long)filp;
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}
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Elf64_Phdr *phdr = buf;
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for (int i = 0; i < ehdr.e_phnum; ++i, ++phdr)
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{
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// kdebug("phdr[%d] phdr->p_offset=%#018lx phdr->p_vaddr=%#018lx phdr->p_memsz=%ld phdr->p_filesz=%ld phdr->p_type=%d", i, phdr->p_offset, phdr->p_vaddr, phdr->p_memsz, phdr->p_filesz, phdr->p_type);
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// 不是可加载的段
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if (phdr->p_type != PT_LOAD)
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continue;
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int64_t remain_mem_size = phdr->p_memsz;
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int64_t remain_file_size = phdr->p_filesz;
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pos = phdr->p_offset;
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uint64_t virt_base = phdr->p_vaddr;
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while (remain_mem_size > 0)
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{
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// todo: 改用slab分配4K大小内存块并映射到4K页
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if (!mm_check_mapped((uint64_t)current_pcb->mm->pgd, virt_base)) // 未映射，则新增物理页
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{
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mm_map_proc_page_table((uint64_t)current_pcb->mm->pgd, true, virt_base, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE, true);
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}
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pos = filp->file_ops->lseek(filp, pos, SEEK_SET);
|
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int64_t val = 0;
|
||||
if (remain_file_size != 0)
|
||||
{
|
||||
int64_t to_trans = (remain_file_size > PAGE_2M_SIZE) ? PAGE_2M_SIZE : remain_file_size;
|
||||
val = filp->file_ops->read(filp, (char*)virt_base, to_trans, &pos);
|
||||
}
|
||||
|
||||
if (val < 0)
|
||||
goto load_elf_failed;
|
||||
|
||||
remain_mem_size -= PAGE_2M_SIZE;
|
||||
remain_file_size -= val;
|
||||
virt_base += PAGE_2M_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
// 分配2MB的栈内存空间
|
||||
regs->rsp = current_pcb->mm->stack_start;
|
||||
regs->rbp = current_pcb->mm->stack_start;
|
||||
mm_map_proc_page_table((uint64_t)current_pcb->mm->pgd, true, current_pcb->mm->stack_start - PAGE_2M_SIZE, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE, true);
|
||||
|
||||
load_elf_failed:;
|
||||
if (buf != NULL)
|
||||
kfree(buf);
|
||||
return retval;
|
||||
}
|
||||
/**
|
||||
* @brief 使当前进程去执行新的代码
|
||||
*
|
||||
@ -398,11 +519,9 @@ ul do_execve(struct pt_regs *regs, char *path)
|
||||
*
|
||||
*/
|
||||
// 映射1个2MB的物理页
|
||||
unsigned long code_start_addr = 0x800000;
|
||||
unsigned long stack_start_addr = 0xa00000;
|
||||
uint64_t brk_start_addr = 0xc00000;
|
||||
|
||||
mm_map_proc_page_table((uint64_t)current_pcb->mm->pgd, true, code_start_addr, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE, true);
|
||||
unsigned long stack_start_addr = 0x6fffffc00000;
|
||||
uint64_t brk_start_addr = 0x6fffffc00000;
|
||||
|
||||
process_switch_mm(current_pcb);
|
||||
|
||||
@ -410,7 +529,6 @@ ul do_execve(struct pt_regs *regs, char *path)
|
||||
if (!(current_pcb->flags & PF_KTHREAD))
|
||||
current_pcb->addr_limit = USER_MAX_LINEAR_ADDR;
|
||||
|
||||
current_pcb->mm->code_addr_start = code_start_addr;
|
||||
current_pcb->mm->code_addr_end = 0;
|
||||
current_pcb->mm->data_addr_start = 0;
|
||||
current_pcb->mm->data_addr_end = 0;
|
||||
@ -428,13 +546,7 @@ ul do_execve(struct pt_regs *regs, char *path)
|
||||
// 清除进程的vfork标志位
|
||||
current_pcb->flags &= ~PF_VFORK;
|
||||
|
||||
struct vfs_file_t *filp = process_open_exec_file(path);
|
||||
if ((unsigned long)filp <= 0)
|
||||
return (unsigned long)filp;
|
||||
|
||||
memset((void *)code_start_addr, 0, PAGE_2M_SIZE);
|
||||
uint64_t pos = 0;
|
||||
int retval = filp->file_ops->read(filp, (char *)code_start_addr, PAGE_2M_SIZE, &pos);
|
||||
process_load_elf_file(regs, path);
|
||||
kdebug("execve ok");
|
||||
|
||||
return 0;
|
||||
|
||||
@ -20,12 +20,14 @@ all:
|
||||
$(MAKE) init.o
|
||||
$(MAKE) sys_api_lib
|
||||
|
||||
objcopy -I elf64-x86-64 -S -R ".eh_frame" -R ".comment" -O binary sys_api_lib $(ROOT_PATH)/bin/user/init.bin
|
||||
# objcopy -I elf64-x86-64 -S -R ".eh_frame" -R ".comment" -O binary sys_api_lib $(ROOT_PATH)/bin/user/init.bin
|
||||
objcopy -I elf64-x86-64 -S -R ".eh_frame" -R ".comment" -O elf64-x86-64 sys_api_lib $(ROOT_PATH)/bin/user/init.bin
|
||||
|
||||
sys_api_lib: init.o
|
||||
|
||||
|
||||
ld -b elf64-x86-64 -z muldefs -o sys_api_lib init.o $(shell find . -name "*.o") -T init.lds
|
||||
ld -b elf64-x86-64 -z muldefs -o sys_api_lib init.o $(shell find . -name "*.o")
|
||||
#ld -b elf64-x86-64 -z muldefs -o sys_api_lib init.o $(shell find . -name "*.o") -T init.lds
|
||||
|
||||
init.o: init.c
|
||||
gcc $(current_CFLAGS) -c init.c -o init.o
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user