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128 lines
3.1 KiB
C
128 lines
3.1 KiB
C
#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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#include <driver/disk/ahci/ahci.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 导出系统调用处理函数的符号
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*
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*/
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#define SYSCALL_COMMON(syscall_num, symbol) extern unsigned long symbol(struct pt_regs *regs);
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SYSCALL_COMMON(0, system_call_not_exists); // 导出system_call_not_exists函数
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#undef SYSCALL_COMMON // 取消前述宏定义
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/**
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* @brief 重新定义为：把系统调用函数加入系统调用表
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* @param syscall_num 系统调用号
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* @param symbol 系统调用处理函数
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*/
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#define SYSCALL_COMMON(syscall_num, symbol) [syscall_num] = symbol,
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/**
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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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*/
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ul system_call_function(struct pt_regs *regs)
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{
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return system_call_table[regs->rax](regs);
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}
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/**
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* @brief 初始化系统调用模块
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*
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*/
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void syscall_init()
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{
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kinfo("Initializing syscall...");
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set_system_trap_gate(0x80, 0, syscall_int); // 系统调用门
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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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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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* @brief 打印字符串的系统调用
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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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* @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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* @param arg2 背景色
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* @return ul 返回值
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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 && regs->r10 == 0)
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printk((char *)regs->r8);
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else
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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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ul sys_ahci_end_req(struct pt_regs *regs)
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{
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ahci_end_request();
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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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regs->rax = ret; // 返回码
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}
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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 ... 254] = system_call_not_exists,
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[255] = sys_ahci_end_req};
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