linux-traps.c
/*
* linux/kernel/traps.c
*－－－－－－－－－－－－－－－－－asm.s文件调用的相应C函数代码
* (C) 1991 Linus Torvalds
*/
/*
* 'Traps.c' handles hardware traps and faults after we have saved some
* state in 'asm.s'. Currently mostly a debugging-aid, will be extended
* to mainly kill the offending process (probably by giving it a signal,
* but possibly by killing it outright if necessary).
*/
#include <string.h>
#include <linux/head.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <asm/system.h>
#include <asm/segment.h>
#include <asm/io.h>
//取段seg中地址addr处的1B
#define get_seg_byte(seg,addr) ({ /
register char __res; /
__asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" /
:"=a" (__res):"0" (seg),"m" (*(addr))); /
__res;})
//取段seg中地址addr处的4B
#define get_seg_long(seg,addr) ({ /
register unsigned long __res; /
__asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" /
:"=a" (__res):"0" (seg),"m" (*(addr))); /
__res;})
//取段seg寄存器的值
#define _fs() ({ /
register unsigned short __res; /
__asm__("mov %%fs,%%ax":"=a" (__res):); /
__res;})
void page_exception(void); //页异常
void divide_error(void); //int0
void debug(void);
void nmi(void);
void int3(void);
void overflow(void);
void bounds(void);
void invalid_op(void);
void device_not_available(void);
void double_fault(void);
void coprocessor_segment_overrun(void);
void invalid_TSS(void);
void segment_not_present(void);
void stack_segment(void);
void general_protection(void);
void page_fault(void); //int14
void coprocessor_error(void); //int16
void reserved(void); //int15
void parallel_interrupt(void); //int39
void irq13(void); //int45
void alignment_check(void); //int46
static void die(char * str,long esp_ptr,long nr)
{ //打印出错信息
long * esp = (long *) esp_ptr;
int i;
printk("%s: %04x/n/r",str,nr&0xffff);
printk("EIP:/t%04x:%p/nEFLAGS:/t%p/nESP:/t%04x:%p/n",
esp[1],esp[0],esp[2],esp[4],esp[3]);
printk("fs: %04x/n",_fs());
printk("base: %p, limit: %p/n",get_base(current->ldt[1]),get_limit(0x17));
if (esp[4] == 0x17) {
printk("Stack: ");
for (i=0;i<4;i++)
printk("%p ",get_seg_long(0x17,i+(long *)esp[3]));
printk("/n");
}
str(i);
printk("Pid: %d, process nr: %d/n/r",current->pid,0xffff & i);
for(i=0;i<10;i++)
printk("%02x ",0xff & get_seg_byte(esp[1],(i+(char *)esp[0])));
printk("/n/r");
do_exit(11); /* play segment exception */
}
void do_double_fault(long esp, long error_code)
{
die("double fault",esp,error_code);
}
void do_general_protection(long esp, long error_code)
{
die("general protection",esp,error_code);
}
void do_alignment_check(long esp, long error_code)
{
die("alignment check",esp,error_code);
}
void do_divide_error(long esp, long error_code)
{
die("divide error",esp,error_code);
}
void do_int3(long * esp, long error_code,
long fs,long es,long ds,
long ebp,long esi,long edi,
long edx,long ecx,long ebx,long eax) //参数为中断时入栈的信息
{
int tr;
__asm__("str %%ax":"=a" (tr):"0" (0));
printk("eax/t/tebx/t/tecx/t/tedx/n/r%8x/t%8x/t%8x/t%8x/n/r",
eax,ebx,ecx,edx);
printk("esi/t/tedi/t/tebp/t/tesp/n/r%8x/t%8x/t%8x/t%8x/n/r",
esi,edi,ebp,(long) esp);
printk("/n/rds/tes/tfs/ttr/n/r%4x/t%4x/t%4x/t%4x/n/r",
ds,es,fs,tr);
printk("EIP: %8x CS: %4x EFLAGS: %8x/n/r",esp[0],esp[1],esp[2]);
}
void do_nmi(long esp, long error_code)
{
die("nmi",esp,error_code);
}
void do_debug(long esp, long error_code)
{
die("debug",esp,error_code);
}
void do_overflow(long esp, long error_code)
{
die("overflow",esp,error_code);
}
void do_bounds(long esp, long error_code)
{
die("bounds",esp,error_code);
}
void do_invalid_op(long esp, long error_code)
{
die("invalid operand",esp,error_code);
}
void do_device_not_available(long esp, long error_code)
{
die("device not available",esp,error_code);
}
void do_coprocessor_segment_overrun(long esp, long error_code)
{
die("coprocessor segment overrun",esp,error_code);
}
void do_invalid_TSS(long esp,long error_code)
{
die("invalid TSS",esp,error_code);
}
void do_segment_not_present(long esp,long error_code)
{
die("segment not present",esp,error_code);
}
void do_stack_segment(long esp,long error_code)
{
die("stack segment",esp,error_code);
}
void do_coprocessor_error(long esp, long error_code)
{
if (last_task_used_math != current)
return;
die("coprocessor error",esp,error_code);
}
void do_reserved(long esp, long error_code)
{
die("reserved (15,17-47) error",esp,error_code);
}
void trap_init(void)
{ //异常终端程序初始化子程序，设置它们的中断调用门（中断向量）
int i;
set_trap_gate(0,÷_error);
set_trap_gate(1,&debug);
set_trap_gate(2,&nmi);
set_system_gate(3,&int3); /* int3-5 can be called from all */
set_system_gate(4,&overflow);
set_system_gate(5,&bounds);
set_trap_gate(6,&invalid_op);
set_trap_gate(7,&device_not_available);
set_trap_gate(8,&double_fault);
set_trap_gate(9,&coprocessor_segment_overrun);
set_trap_gate(10,&invalid_TSS);
set_trap_gate(11,&segment_not_present);
set_trap_gate(12,&stack_segment);
set_trap_gate(13,&general_protection);
set_trap_gate(14,&page_fault);
set_trap_gate(15,&reserved);
set_trap_gate(16,&coprocessor_error);
set_trap_gate(17,&alignment_check);
for (i=18;i<48;i++)
set_trap_gate(i,&reserved);
set_trap_gate(45,&irq13);
outb_p(inb_p(0x21)&0xfb,0x21);
outb(inb_p(0xA1)&0xdf,0xA1);
set_trap_gate(39,¶llel_interrupt);
}
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