200 lines
4.9 KiB
C
200 lines
4.9 KiB
C
/*
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* 'Traps.c' handles hardware traps and faults after we have saved some
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* state in 'asm.s'. Currently mostly a debugging-aid, will be extended
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* to mainly kill the offending process (probably by giving it a signal,
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* but possibly by killing it outright if necessary).
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*/
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#include <string.h>
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#include <linux/head.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <asm/system.h>
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#include <asm/segment.h>
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#define get_seg_byte(seg,addr) ({ \
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register char __res; \
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__asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \
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:"=a" (__res):"0" (seg),"m" (*(addr))); \
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__res;})
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#define get_seg_long(seg,addr) ({ \
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register unsigned long __res; \
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__asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \
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:"=a" (__res):"0" (seg),"m" (*(addr))); \
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__res;})
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#define _fs() ({ \
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register unsigned short __res; \
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__asm__("mov %%fs,%%ax":"=a" (__res):); \
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__res;})
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int do_exit(long code);
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void page_exception(void);
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void divide_error(void);
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void debug(void);
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void nmi(void);
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void int3(void);
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void overflow(void);
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void bounds(void);
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void invalid_op(void);
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void device_not_available(void);
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void double_fault(void);
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void coprocessor_segment_overrun(void);
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void invalid_TSS(void);
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void segment_not_present(void);
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void stack_segment(void);
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void general_protection(void);
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void page_fault(void);
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void coprocessor_error(void);
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void reserved(void);
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static void die(char * str,long esp_ptr,long nr)
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{
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long * esp = (long *) esp_ptr;
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int i;
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printk("%s: %04x\n\r",str,nr&0xffff);
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printk("EIP:\t%04x:%p\nEFLAGS:\t%p\nESP:\t%04x:%p\n",
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esp[1],esp[0],esp[2],esp[4],esp[3]);
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printk("fs: %04x\n",_fs());
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printk("base: %p, limit: %p\n",get_base(current->ldt[1]),get_limit(0x17));
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if (esp[4] == 0x17) {
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printk("Stack: ");
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for (i=0;i<4;i++)
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printk("%p ",get_seg_long(0x17,i+(long *)esp[3]));
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printk("\n");
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}
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str(i);
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printk("Pid: %d, process nr: %d\n\r",current->pid,0xffff & i);
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for(i=0;i<10;i++)
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printk("%02x ",0xff & get_seg_byte(esp[1],(i+(char *)esp[0])));
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printk("\n\r");
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do_exit(11); /* play segment exception */
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}
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void do_double_fault(long esp, long error_code)
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{
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die("double fault",esp,error_code);
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}
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void do_general_protection(long esp, long error_code)
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{
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die("general protection",esp,error_code);
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}
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void do_divide_error(long esp, long error_code)
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{
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die("divide error",esp,error_code);
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}
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void do_int3(long * esp, long error_code,
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long fs,long es,long ds,
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long ebp,long esi,long edi,
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long edx,long ecx,long ebx,long eax)
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{
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int tr;
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__asm__("str %%ax":"=a" (tr):"0" (0));
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printk("eax\t\tebx\t\tecx\t\tedx\n\r%8x\t%8x\t%8x\t%8x\n\r",
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eax,ebx,ecx,edx);
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printk("esi\t\tedi\t\tebp\t\tesp\n\r%8x\t%8x\t%8x\t%8x\n\r",
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esi,edi,ebp,(long) esp);
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printk("\n\rds\tes\tfs\ttr\n\r%4x\t%4x\t%4x\t%4x\n\r",
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ds,es,fs,tr);
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printk("EIP: %8x CS: %4x EFLAGS: %8x\n\r",esp[0],esp[1],esp[2]);
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}
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void do_nmi(long esp, long error_code)
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{
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die("nmi",esp,error_code);
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}
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void do_debug(long esp, long error_code)
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{
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die("debug",esp,error_code);
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}
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void do_overflow(long esp, long error_code)
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{
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die("overflow",esp,error_code);
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}
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void do_bounds(long esp, long error_code)
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{
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die("bounds",esp,error_code);
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}
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void do_invalid_op(long esp, long error_code)
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{
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die("invalid operand",esp,error_code);
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}
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void do_device_not_available(long esp, long error_code)
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{
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die("device not available",esp,error_code);
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}
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void do_coprocessor_segment_overrun(long esp, long error_code)
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{
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die("coprocessor segment overrun",esp,error_code);
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}
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void do_invalid_TSS(long esp,long error_code)
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{
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die("invalid TSS",esp,error_code);
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}
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void do_segment_not_present(long esp,long error_code)
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{
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die("segment not present",esp,error_code);
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}
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void do_stack_segment(long esp,long error_code)
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{
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die("stack segment",esp,error_code);
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}
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void do_coprocessor_error(long esp, long error_code)
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{
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die("coprocessor error",esp,error_code);
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}
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void do_reserved(long esp, long error_code)
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{
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die("reserved (15,17-31) error",esp,error_code);
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}
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void trap_init(void)
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{
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int i;
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set_trap_gate(0,÷_error);
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set_trap_gate(1,&debug);
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set_trap_gate(2,&nmi);
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set_system_gate(3,&int3); /* int3-5 can be called from all */
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set_system_gate(4,&overflow);
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set_system_gate(5,&bounds);
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set_trap_gate(6,&invalid_op);
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set_trap_gate(7,&device_not_available);
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set_trap_gate(8,&double_fault);
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set_trap_gate(9,&coprocessor_segment_overrun);
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set_trap_gate(10,&invalid_TSS);
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set_trap_gate(11,&segment_not_present);
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set_trap_gate(12,&stack_segment);
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set_trap_gate(13,&general_protection);
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set_trap_gate(14,&page_fault);
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set_trap_gate(15,&reserved);
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set_trap_gate(16,&coprocessor_error);
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for (i=17;i<32;i++)
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set_trap_gate(i,&reserved);
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/* __asm__("movl $0x3ff000,%%eax\n\t"
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"movl %%eax,%%db0\n\t"
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"movl $0x000d0303,%%eax\n\t"
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"movl %%eax,%%db7"
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:::"ax");*/
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}
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