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实现了打开、关闭、读取文件的功能

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fslongjin
2022-04-27 20:49:10 +08:00
parent 966d67fcde
commit b3ad8405a4
10 changed files with 258 additions and 105 deletions
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7
kernel/process/proc.S
View File

@ -1,5 +1,12 @@
#include"../common/asm.h"
/**
* @brief 导出内核线程的执行引导程序
* 目的是还原执行现场(在kernel_thread中伪造的)
* 执行到这里时，rsp位于栈顶，然后弹出寄存器值
* 弹出之后还要向上移动7个unsigned long的大小，从而弹出额外的信息（详见pt_regs）
*/
ENTRY(kernel_thread_func)
popq %r15
popq %r14

133
kernel/process/process.c
View File

@ -85,26 +85,74 @@ void user_level_function()
: "a"(SYS_PUT_STRING), "m"(addr)
: "memory", "r8");
*/
while (1)
{
// 测试sys_open
char string[] = "a.txt";
long err_code = 1;
int zero = 0;
uint64_t addr = (ul)string;
__asm__ __volatile__(
"movq %2, %%r8 \n\t"
"movq %3, %%r9 \n\t"
"movq %4, %%r10 \n\t"
"movq %5, %%r11 \n\t"
"movq %6, %%r12 \n\t"
"movq %7, %%r13 \n\t"
"movq %8, %%r14 \n\t"
"movq %9, %%r15 \n\t"
"int $0x80 \n\t"
: "=a"(err_code)
: "a"(SYS_OPEN), "m"(addr), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero)
: "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rcx", "rdx");
// 测试sys_open
char string[] = "/xx/12.png";
long err_code = 1;
int zero = 0;
uint64_t addr = (ul)string;
__asm__ __volatile__(
"movq %2, %%r8 \n\t"
"movq %3, %%r9 \n\t"
"movq %4, %%r10 \n\t"
"movq %5, %%r11 \n\t"
"movq %6, %%r12 \n\t"
"movq %7, %%r13 \n\t"
"movq %8, %%r14 \n\t"
"movq %9, %%r15 \n\t"
"int $0x80 \n\t"
: "=a"(err_code)
: "a"(SYS_OPEN), "m"(addr), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero)
: "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rcx", "rdx");
int fd_num = err_code;
int count = 16;
while (count)
{
uchar buf[128] = {0};
// Test sys_read
addr = (uint64_t)&buf;
__asm__ __volatile__(
"movq %2, %%r8 \n\t"
"movq %3, %%r9 \n\t"
"movq %4, %%r10 \n\t"
"movq %5, %%r11 \n\t"
"movq %6, %%r12 \n\t"
"movq %7, %%r13 \n\t"
"movq %8, %%r14 \n\t"
"movq %9, %%r15 \n\t"
"int $0x80 \n\t"
: "=a"(err_code)
: "a"(SYS_READ), "m"(fd_num), "m"(addr), "m"(count), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero)
: "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rcx", "rdx");
count = err_code;
// 将读取到的数据打印出来
addr = (ul)buf;
__asm__ __volatile__(
"movq %2, %%r8 \n\t"
"int $0x80 \n\t"
: "=a"(err_code)
: "a"(SYS_PUT_STRING), "m"(addr)
: "memory", "r8");
}
// Test sys_close
__asm__ __volatile__(
"movq %2, %%r8 \n\t"
"movq %3, %%r9 \n\t"
"movq %4, %%r10 \n\t"
"movq %5, %%r11 \n\t"
"movq %6, %%r12 \n\t"
"movq %7, %%r13 \n\t"
"movq %8, %%r14 \n\t"
"movq %9, %%r15 \n\t"
"int $0x80 \n\t"
: "=a"(err_code)
: "a"(SYS_CLOSE), "m"(fd_num), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero), "m"(zero)
: "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rcx", "rdx");
}
while (1)
pause();
}
@ -204,46 +252,6 @@ ul process_thread_do_exit(ul code)
;
}
/**
* @brief 导出内核线程的执行引导程序
* 目的是还原执行现场(在kernel_thread中伪造的)
* 执行到这里时，rsp位于栈顶，然后弹出寄存器值
* 弹出之后还要向上移动7个unsigned long的大小，从而弹出额外的信息（详见pt_regs）
*/
/*
void kernel_thread_func(void)
{
__asm__ volatile(
//"kernel_thread_func: \n\t"
" popq %r15 \n\t"
" popq %r14 \n\t"
" popq %r13 \n\t"
" popq %r12 \n\t"
" popq %r11 \n\t"
" popq %r10 \n\t"
" popq %r9 \n\t"
" popq %r8 \n\t"
" popq %rbx \n\t"
" popq %rcx \n\t"
" popq %rdx \n\t"
" popq %rsi \n\t"
" popq %rdi \n\t"
" popq %rbp \n\t"
" popq %rax \n\t"
" movq %rax, %ds \n\t"
" popq %rax \n\t"
" movq %rax, %es \n\t"
" popq %rax \n\t"
" addq $0x38, %rsp \n\t"
/////////////////////////////////
" movq %rdx, %rdi \n\t"
" callq *%rbx \n\t"
" movq %rax, %rdi \n\t"
" callq process_thread_do_exit \n\t");
}
*/
/**
* @brief 初始化内核进程
*
@ -302,15 +310,6 @@ void process_init()
initial_mm.stack_start = _stack_start;
/*
// 向MSR寄存器组中的 IA32_SYSENTER_CS寄存器写入内核的代码段的地址
wrmsr(0x174, KERNEL_CS);
// 向MSR寄存器组中的 IA32_SYSENTER_ESP寄存器写入内核进程的rbp（在syscall入口中会将rsp减去相应的数值）
wrmsr(0x175, current_pcb->thread->rbp);
// 向MSR寄存器组中的 IA32_SYSENTER_EIP寄存器写入系统调用入口的地址。
wrmsr(0x176, (ul)system_call);
*/
// 初始化进程和tss
// set_tss64((uint *)phys_2_virt(TSS64_Table), initial_thread.rbp, initial_tss[0].rsp1, initial_tss[0].rsp2, initial_tss[0].ist1, initial_tss[0].ist2, initial_tss[0].ist3, initial_tss[0].ist4, initial_tss[0].ist5, initial_tss[0].ist6, initial_tss[0].ist7);