Annotation of linux/kernel/traps.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * 'Traps.c' handles hardware traps and faults after we have saved some
        !             3:  * state in 'asm.s'. Currently mostly a debugging-aid, will be extended
        !             4:  * to mainly kill the offending process (probably by giving it a signal,
        !             5:  * but possibly by killing it outright if necessary).
        !             6:  */
        !             7: #include <string.h>
        !             8: 
        !             9: #include <linux/head.h>
        !            10: #include <linux/sched.h>
        !            11: #include <linux/kernel.h>
        !            12: #include <asm/system.h>
        !            13: #include <asm/segment.h>
        !            14: 
        !            15: #define get_seg_byte(seg,addr) ({ \
        !            16: register char __res; \
        !            17: __asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \
        !            18:        :"=a" (__res):"0" (seg),"m" (*(addr))); \
        !            19: __res;})
        !            20: 
        !            21: #define get_seg_long(seg,addr) ({ \
        !            22: register unsigned long __res; \
        !            23: __asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \
        !            24:        :"=a" (__res):"0" (seg),"m" (*(addr))); \
        !            25: __res;})
        !            26: 
        !            27: #define _fs() ({ \
        !            28: register unsigned short __res; \
        !            29: __asm__("mov %%fs,%%ax":"=a" (__res):); \
        !            30: __res;})
        !            31: 
        !            32: int do_exit(long code);
        !            33: 
        !            34: void page_exception(void);
        !            35: 
        !            36: void divide_error(void);
        !            37: void debug(void);
        !            38: void nmi(void);
        !            39: void int3(void);
        !            40: void overflow(void);
        !            41: void bounds(void);
        !            42: void invalid_op(void);
        !            43: void device_not_available(void);
        !            44: void double_fault(void);
        !            45: void coprocessor_segment_overrun(void);
        !            46: void invalid_TSS(void);
        !            47: void segment_not_present(void);
        !            48: void stack_segment(void);
        !            49: void general_protection(void);
        !            50: void page_fault(void);
        !            51: void coprocessor_error(void);
        !            52: void reserved(void);
        !            53: 
        !            54: static void die(char * str,long esp_ptr,long nr)
        !            55: {
        !            56:        long * esp = (long *) esp_ptr;
        !            57:        int i;
        !            58: 
        !            59:        printk("%s: %04x\n\r",str,nr&0xffff);
        !            60:        printk("EIP:\t%04x:%p\nEFLAGS:\t%p\nESP:\t%04x:%p\n",
        !            61:                esp[1],esp[0],esp[2],esp[4],esp[3]);
        !            62:        printk("fs: %04x\n",_fs());
        !            63:        printk("base: %p, limit: %p\n",get_base(current->ldt[1]),get_limit(0x17));
        !            64:        if (esp[4] == 0x17) {
        !            65:                printk("Stack: ");
        !            66:                for (i=0;i<4;i++)
        !            67:                        printk("%p ",get_seg_long(0x17,i+(long *)esp[3]));
        !            68:                printk("\n");
        !            69:        }
        !            70:        str(i);
        !            71:        printk("Pid: %d, process nr: %d\n\r",current->pid,0xffff & i);
        !            72:        for(i=0;i<10;i++)
        !            73:                printk("%02x ",0xff & get_seg_byte(esp[1],(i+(char *)esp[0])));
        !            74:        printk("\n\r");
        !            75:        do_exit(11);            /* play segment exception */
        !            76: }
        !            77: 
        !            78: void do_double_fault(long esp, long error_code)
        !            79: {
        !            80:        die("double fault",esp,error_code);
        !            81: }
        !            82: 
        !            83: void do_general_protection(long esp, long error_code)
        !            84: {
        !            85:        die("general protection",esp,error_code);
        !            86: }
        !            87: 
        !            88: void do_divide_error(long esp, long error_code)
        !            89: {
        !            90:        die("divide error",esp,error_code);
        !            91: }
        !            92: 
        !            93: void do_int3(long * esp, long error_code,
        !            94:                long fs,long es,long ds,
        !            95:                long ebp,long esi,long edi,
        !            96:                long edx,long ecx,long ebx,long eax)
        !            97: {
        !            98:        int tr;
        !            99: 
        !           100:        __asm__("str %%ax":"=a" (tr):"0" (0));
        !           101:        printk("eax\t\tebx\t\tecx\t\tedx\n\r%8x\t%8x\t%8x\t%8x\n\r",
        !           102:                eax,ebx,ecx,edx);
        !           103:        printk("esi\t\tedi\t\tebp\t\tesp\n\r%8x\t%8x\t%8x\t%8x\n\r",
        !           104:                esi,edi,ebp,(long) esp);
        !           105:        printk("\n\rds\tes\tfs\ttr\n\r%4x\t%4x\t%4x\t%4x\n\r",
        !           106:                ds,es,fs,tr);
        !           107:        printk("EIP: %8x   CS: %4x  EFLAGS: %8x\n\r",esp[0],esp[1],esp[2]);
        !           108: }
        !           109: 
        !           110: void do_nmi(long esp, long error_code)
        !           111: {
        !           112:        die("nmi",esp,error_code);
        !           113: }
        !           114: 
        !           115: void do_debug(long esp, long error_code)
        !           116: {
        !           117:        die("debug",esp,error_code);
        !           118: }
        !           119: 
        !           120: void do_overflow(long esp, long error_code)
        !           121: {
        !           122:        die("overflow",esp,error_code);
        !           123: }
        !           124: 
        !           125: void do_bounds(long esp, long error_code)
        !           126: {
        !           127:        die("bounds",esp,error_code);
        !           128: }
        !           129: 
        !           130: void do_invalid_op(long esp, long error_code)
        !           131: {
        !           132:        die("invalid operand",esp,error_code);
        !           133: }
        !           134: 
        !           135: void do_device_not_available(long esp, long error_code)
        !           136: {
        !           137:        die("device not available",esp,error_code);
        !           138: }
        !           139: 
        !           140: void do_coprocessor_segment_overrun(long esp, long error_code)
        !           141: {
        !           142:        die("coprocessor segment overrun",esp,error_code);
        !           143: }
        !           144: 
        !           145: void do_invalid_TSS(long esp,long error_code)
        !           146: {
        !           147:        die("invalid TSS",esp,error_code);
        !           148: }
        !           149: 
        !           150: void do_segment_not_present(long esp,long error_code)
        !           151: {
        !           152:        die("segment not present",esp,error_code);
        !           153: }
        !           154: 
        !           155: void do_stack_segment(long esp,long error_code)
        !           156: {
        !           157:        die("stack segment",esp,error_code);
        !           158: }
        !           159: 
        !           160: void do_coprocessor_error(long esp, long error_code)
        !           161: {
        !           162:        die("coprocessor error",esp,error_code);
        !           163: }
        !           164: 
        !           165: void do_reserved(long esp, long error_code)
        !           166: {
        !           167:        die("reserved (15,17-31) error",esp,error_code);
        !           168: }
        !           169: 
        !           170: void trap_init(void)
        !           171: {
        !           172:        int i;
        !           173: 
        !           174:        set_trap_gate(0,&divide_error);
        !           175:        set_trap_gate(1,&debug);
        !           176:        set_trap_gate(2,&nmi);
        !           177:        set_system_gate(3,&int3);       /* int3-5 can be called from all */
        !           178:        set_system_gate(4,&overflow);
        !           179:        set_system_gate(5,&bounds);
        !           180:        set_trap_gate(6,&invalid_op);
        !           181:        set_trap_gate(7,&device_not_available);
        !           182:        set_trap_gate(8,&double_fault);
        !           183:        set_trap_gate(9,&coprocessor_segment_overrun);
        !           184:        set_trap_gate(10,&invalid_TSS);
        !           185:        set_trap_gate(11,&segment_not_present);
        !           186:        set_trap_gate(12,&stack_segment);
        !           187:        set_trap_gate(13,&general_protection);
        !           188:        set_trap_gate(14,&page_fault);
        !           189:        set_trap_gate(15,&reserved);
        !           190:        set_trap_gate(16,&coprocessor_error);
        !           191:        for (i=17;i<32;i++)
        !           192:                set_trap_gate(i,&reserved);
        !           193: /*     __asm__("movl $0x3ff000,%%eax\n\t"
        !           194:                "movl %%eax,%%db0\n\t"
        !           195:                "movl $0x000d0303,%%eax\n\t"
        !           196:                "movl %%eax,%%db7"
        !           197:                :::"ax");*/
        !           198: }
        !           199: 

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