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https://github.com/DragonOS-Community/DragonOS.git
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改用int250作为系统调用
This commit is contained in:
fslongjin
@ -1,11 +1,14 @@
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#include "syscall.h"
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#include "../process/process.h"
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#include <exception/gate.h>
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#include <exception/irq.h>
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// 导出系统调用入口函数，定义在entry.S中
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extern void system_call(void);
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extern void syscall_int(void);
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/**
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* @brief 系统调用函数，从entry.S中跳转到这里
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* @brief sysenter的系统调用函数，从entry.S中跳转到这里
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*
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* @param regs 3特权级下的寄存器值,rax存储系统调用号
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* @return ul 对应的系统调用函数的地址
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@ -22,17 +25,19 @@ ul system_call_function(struct pt_regs *regs)
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void syscall_init()
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{
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kinfo("Initializing syscall...");
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/*
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// 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
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wrmsr(0x174, KERNEL_CS);
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// 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）
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wrmsr(0x175, current_pcb->thread->rbp);
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// 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。
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wrmsr(0x176, (ul)system_call);
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*/
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set_system_trap_gate(250, 0, syscall_intr_table[0]); // 系统调用门
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}
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/*
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long enter_syscall(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, ul arg5, ul arg6, ul arg7)
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{
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long err_code;
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@ -53,12 +58,66 @@ long enter_syscall(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, u
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: "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rcx", "rdx");
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return err_code;
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}
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*/
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ul enter_syscall_int(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, ul arg5, ul arg6, ul arg7)
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{
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long err_code;
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__asm__ __volatile__(
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"movq %2, %%r8 \n\t"
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"movq %3, %%r9 \n\t"
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"movq %4, %%r10 \n\t"
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"movq %5, %%r11 \n\t"
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"movq %6, %%r12 \n\t"
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"movq %7, %%r13 \n\t"
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"movq %8, %%r14 \n\t"
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"movq %9, %%r15 \n\t"
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"int $0x80 \n\t"
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: "=a"(err_code)
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: "a"(syscall_id), "m"(arg0), "m"(arg1), "m"(arg2), "m"(arg3), "m"(arg4), "m"(arg5), "m"(arg6), "m"(arg7)
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: "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15");
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return err_code;
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}
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/**
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* @brief 通过中断进入系统调用
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*
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* @param syscall_id
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* @param arg0
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* @param arg1
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* @param arg2
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* @param arg3
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* @param arg4
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* @param arg5
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* @param arg6
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* @param arg7
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* @return long
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*/
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/*
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long enter_syscall_int(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, ul arg5, ul arg6, ul arg7)
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{
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long err_code;
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__asm__ __volatile__(
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"movq %2, %%r8 \n\t"
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"movq %3, %%r9 \n\t"
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"movq %4, %%r10 \n\t"
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"movq %5, %%r11 \n\t"
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"movq %6, %%r12 \n\t"
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"movq %7, %%r13 \n\t"
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"movq %8, %%r14 \n\t"
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"movq %9, %%r15 \n\t"
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"int $0x80 \n\t"
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: "=a"(err_code)
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: "a"(syscall_id), "m"(arg0), "m"(arg1), "m"(arg2), "m"(arg3), "m"(arg4), "m"(arg5), "m"(arg6), "m"(arg7)
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: "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rcx", "rdx");
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return err_code;
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}
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*/
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/**
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* @brief 打印字符串的系统调用
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*
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*
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* 当arg1和arg2均为0时，打印黑底白字，否则按照指定的前景色和背景色来打印
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*
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*
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* @param regs 寄存器
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* @param arg0 要打印的字符串
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* @param arg1 前景色
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@ -67,11 +126,20 @@ long enter_syscall(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, u
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*/
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ul sys_printf(struct pt_regs *regs)
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{
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//if(regs->r9 == 0 &®s->r10 == 0)
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// printk((char*)regs->r8);
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//else printk_color(regs->r9, regs->r10, (char*)regs->r8);
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printk_color(BLACK,WHITE,(char *)regs->rdi);
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// if(regs->r9 == 0 &®s->r10 == 0)
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// printk((char*)regs->r8);
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// else printk_color(regs->r9, regs->r10, (char*)regs->r8);
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printk_color(BLACK, WHITE, (char *)regs->r8);
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return 0;
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}
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// 系统调用的内核入口程序
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void do_syscall_int(struct pt_regs *regs, unsigned long error_code)
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{
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ul ret = system_call_table[regs->rax](regs);
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__asm__ __volatile__("movq %0, %%rax \n\t" ::"r"(ret)
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: "memory");
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}
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@ -9,8 +9,6 @@
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#define ESYSCALL_NOT_EXISTS 1
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typedef unsigned long (*system_call_t)(struct pt_regs *regs);
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extern void ret_from_system_call(void); // 导出从系统调用返回的函数（定义在entry.S）
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@ -27,7 +25,8 @@ void syscall_init();
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* @param syscall_id 系统调用id
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* @return long 错误码
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*/
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long enter_syscall(ul syscall_id,ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, ul arg5, ul arg6, ul arg7);
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long enter_syscall(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, ul arg5, ul arg6, ul arg7);
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ul enter_syscall_int(ul syscall_id, ul arg0, ul arg1, ul arg2, ul arg3, ul arg4, ul arg5, ul arg6, ul arg7);
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/**
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* @brief 系统调用不存在时的处理函数
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@ -43,9 +42,9 @@ ul system_call_not_exists(struct pt_regs *regs)
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/**
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* @brief 打印字符串的系统调用
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*
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*
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* 当arg1和arg2均为0时，打印黑底白字，否则按照指定的前景色和背景色来打印
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*
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*
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* @param regs 寄存器
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* @param arg0 要打印的字符串
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* @param arg1 前景色
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@ -54,9 +53,11 @@ ul system_call_not_exists(struct pt_regs *regs)
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*/
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ul sys_printf(struct pt_regs *regs);
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// 系统调用的内核入口程序
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void do_syscall_int(struct pt_regs *regs, unsigned long error_code);
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system_call_t system_call_table[MAX_SYSTEM_CALL_NUM] =
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{
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[0] = system_call_not_exists,
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[1] = sys_printf,
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[2 ... MAX_SYSTEM_CALL_NUM - 1] = system_call_not_exists
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};
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[2 ... MAX_SYSTEM_CALL_NUM - 1] = system_call_not_exists};
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