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🔧 使用C语言重写了设置中断门的代码。

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This commit is contained in:
fslongjin 2022-01-26 18:04:33 +08:00
parent 06cfb1ceb9
commit ba7f1bb4ea
2 changed files with 32 additions and 59 deletions
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87
kernel/exception/gate.h
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@ -24,73 +24,46 @@ extern struct desc_struct GDT_Table[]; //GDT_Table是head.S中的GDT_Table
extern struct gate_struct IDT_Table[]; //IDT_Table是head.S中的IDT_Table
extern unsigned int TSS64_Table[26];
/**
* @brief 初始化中段描述符表内的门描述符（每个16B）
* @param gate_selector_addr IDT表项的地址
* @param attr P、DPL、TYPE的属性
* @param ist 中断栈表号
* @param code_addr 中断服务程序的地址
* @param code_addr 指向中断服务程序的指针的地址
*/
// todo:在系统异常处理主功能完成后，将这段代码用C来写一遍。这段汇编实在是太晦涩难懂了，我看了半个钟才看明白。
void set_gate(ul *gate_selector_addr, ul attr, unsigned char ist, ul *code_addr)
{
ul __d0=0, __d1=0;
ul tmp_code_addr = *code_addr;
__d0 = attr << 40; //设置P、DPL、Type
/*
#define _set_gate(gate_selector_addr, attr, ist, code_addr) \
do{ \
unsigned long __d0, __d1; \
__asm__ __volatile__ ( "movw %%dx, %%ax \n\t" \
"andq $0x7, %%rcx \n\t" // 清空rcx中除了2:0以外的所有位 此前ist的值已经被赋给了rcx \
"addq %4, %%rcx \n\t" // 将P,DPL, Type的值加到rcx中 \
"shlq $32, %%rcx \n\t" \
"addq %%rcx, %%rax \n\t" // 设置ist \
"xorq %%rcx, %%rcx \n\t" // 清空rcx \
"movl %%edx, %%ecx \n\t" \
"shrq $16, %%ecx \n\t" \
"shlq $48, %%rcx \n\t" // 左移到低8B中表示段内偏移的[31:16]处 \
"addq %%rcx, %%rax \n\t" // 设置段内偏移[31:16] \
"movq %%rax, %0 \n\t" // 输出到门选择子的低8B \
"shrq $32, %%rdx \n\t" \
"movq %%rdx, %1 \n\t" // 输出到门选择子的高8B \
:"=m"(*((unsigned long *)(gate_selector_addr))) , \
"=m"(*(1 + (unsigned long *)(gate_selector_addr))),"=&a"(__d0),"=&d"(__d1) \
:"i"(attr << 8), \
"3"((unsigned long *)(code_addr)),"2"(0x8 << 16),"c"(ist) \
:"memory" \
); \
}while(0)
*/
//由于带上注释就编译不过，因此复制一份到这里
#define _set_gate(gate_selector_addr, attr, ist, code_addr) \
do \
{ \
unsigned long __d0, __d1; \
__asm__ __volatile__("movw %%dx, %%ax \n\t" \
"andq $0x7, %%rcx \n\t" \
"addq %4, %%rcx \n\t" \
"shlq $32, %%rcx \n\t" \
"addq %%rcx, %%rax \n\t" \
"xorq %%rcx, %%rcx \n\t" \
"movl %%edx, %%ecx \n\t" \
"shrq $16, %%rcx \n\t" \
"shlq $48, %%rcx \n\t" \
"addq %%rcx, %%rax \n\t" \
"movq %%rax, %0 \n\t" \
"shrq $32, %%rdx \n\t" \
"movq %%rdx, %1 \n\t" \
: "=m"(*((unsigned long *)(gate_selector_addr))), \
"=m"(*(1 + (unsigned long *)(gate_selector_addr))), "=&a"(__d0), "=&d"(__d1) \
: "i"(attr << 8), \
"3"((unsigned long *)(code_addr)), "2"(0x8 << 16), "c"(ist) \
: "memory"); \
} while (0)
__d0 |= ((ul)(ist) << 32); // 设置ist
__d0 |= 8 << 16; //设置段选择子为0x1000
__d0 |= (0xffff & tmp_code_addr); //设置段内偏移的[15:00]
tmp_code_addr >>= 16;
__d0 |= (0xffff & tmp_code_addr) << 48; // 设置段内偏移[31:16]
tmp_code_addr >>= 16;
__d1 = (0xffffffff & tmp_code_addr); //设置段内偏移[63:32]
*gate_selector_addr = __d0;
*(gate_selector_addr + 1) = __d1;
}
/**
* @brief 加载任务状态段寄存器
* @param n TSS基地址在GDT中的第几项
* 左移3位的原因是GDT每项占8字节
*/
#define load_TR(n) \
do \
{ \
#define load_TR(n) \
do \
{ \
__asm__ __volatile__("ltr %%ax" ::"a"(n << 3)); \
} while (0)
@ -103,7 +76,7 @@ do{ \
*/
void set_intr_gate(unsigned int n, unsigned char ist, void *addr)
{
_set_gate(IDT_Table + n, 0x8E, ist, addr); // p=1，DPL=0, type=E
set_gate(IDT_Table + n, 0x8E, ist, &addr); // p=1，DPL=0, type=E
}
/**
@ -115,7 +88,7 @@ void set_intr_gate(unsigned int n, unsigned char ist, void *addr)
*/
void set_trap_gate(unsigned int n, unsigned char ist, void *addr)
{
_set_gate(IDT_Table + n, 0x8F, ist, addr); // p=1，DPL=0, type=F
set_gate(IDT_Table + n, 0x8F, ist, &addr); // p=1，DPL=0, type=F
}
/**
@ -127,7 +100,7 @@ void set_trap_gate(unsigned int n, unsigned char ist, void *addr)
*/
void set_system_trap_gate(unsigned int n, unsigned char ist, void *addr)
{
_set_gate(IDT_Table + n, 0xEF, ist, addr); // p=1，DPL=3, type=F
set_gate(IDT_Table + n, 0xEF, ist, &addr); // p=1，DPL=3, type=F
}
/**

4
kernel/exception/trap.c
View File

@ -226,9 +226,9 @@ void do_page_fault(unsigned long rsp, unsigned long error_code)
: "=r"(cr2)::"memory");
unsigned long *rip = (unsigned long *)(rsp + 0x98);
printk("[");
printk("[ ");
printk_color(RED, BLACK, "ERROR");
printk("] do_page_fault(14),\tError Code:%18lx,\tRSP:%18lx,\tRIP:%18lx\tCR2:%18lx\n", error_code, rsp, *rip, cr2);
printk(" ] do_page_fault(14),\tError Code:%18lx,\tRSP:%18lx,\tRIP:%18lx\tCR2:%18lx\n", error_code, rsp, *rip, cr2);
printk_color(YELLOW, BLACK, "Information:\n");
if (!(error_code & 0x01))