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Annotation of linux/kernel/traps.c, revision 1.1.1.2

1.1       root        1: /*
1.1.1.2 ! root        2:  *  linux/kernel/traps.c
        !             3:  *
        !             4:  *  (C) 1991  Linus Torvalds
        !             5:  */
        !             6: 
        !             7: /*
1.1       root        8:  * 'Traps.c' handles hardware traps and faults after we have saved some
                      9:  * state in 'asm.s'. Currently mostly a debugging-aid, will be extended
                     10:  * to mainly kill the offending process (probably by giving it a signal,
                     11:  * but possibly by killing it outright if necessary).
                     12:  */
                     13: #include <string.h>
                     14: 
                     15: #include <linux/head.h>
                     16: #include <linux/sched.h>
                     17: #include <linux/kernel.h>
                     18: #include <asm/system.h>
                     19: #include <asm/segment.h>
1.1.1.2 ! root       20: #include <asm/io.h>
1.1       root       21: 
                     22: #define get_seg_byte(seg,addr) ({ \
                     23: register char __res; \
                     24: __asm__("push %%fs;mov %%ax,%%fs;movb %%fs:%2,%%al;pop %%fs" \
                     25:        :"=a" (__res):"0" (seg),"m" (*(addr))); \
                     26: __res;})
                     27: 
                     28: #define get_seg_long(seg,addr) ({ \
                     29: register unsigned long __res; \
                     30: __asm__("push %%fs;mov %%ax,%%fs;movl %%fs:%2,%%eax;pop %%fs" \
                     31:        :"=a" (__res):"0" (seg),"m" (*(addr))); \
                     32: __res;})
                     33: 
                     34: #define _fs() ({ \
                     35: register unsigned short __res; \
                     36: __asm__("mov %%fs,%%ax":"=a" (__res):); \
                     37: __res;})
                     38: 
                     39: int do_exit(long code);
                     40: 
                     41: void page_exception(void);
                     42: 
                     43: void divide_error(void);
                     44: void debug(void);
                     45: void nmi(void);
                     46: void int3(void);
                     47: void overflow(void);
                     48: void bounds(void);
                     49: void invalid_op(void);
                     50: void device_not_available(void);
                     51: void double_fault(void);
                     52: void coprocessor_segment_overrun(void);
                     53: void invalid_TSS(void);
                     54: void segment_not_present(void);
                     55: void stack_segment(void);
                     56: void general_protection(void);
                     57: void page_fault(void);
                     58: void coprocessor_error(void);
                     59: void reserved(void);
1.1.1.2 ! root       60: void parallel_interrupt(void);
        !            61: void irq13(void);
1.1       root       62: 
                     63: static void die(char * str,long esp_ptr,long nr)
                     64: {
                     65:        long * esp = (long *) esp_ptr;
                     66:        int i;
                     67: 
                     68:        printk("%s: %04x\n\r",str,nr&0xffff);
                     69:        printk("EIP:\t%04x:%p\nEFLAGS:\t%p\nESP:\t%04x:%p\n",
                     70:                esp[1],esp[0],esp[2],esp[4],esp[3]);
                     71:        printk("fs: %04x\n",_fs());
                     72:        printk("base: %p, limit: %p\n",get_base(current->ldt[1]),get_limit(0x17));
                     73:        if (esp[4] == 0x17) {
                     74:                printk("Stack: ");
                     75:                for (i=0;i<4;i++)
                     76:                        printk("%p ",get_seg_long(0x17,i+(long *)esp[3]));
                     77:                printk("\n");
                     78:        }
                     79:        str(i);
                     80:        printk("Pid: %d, process nr: %d\n\r",current->pid,0xffff & i);
                     81:        for(i=0;i<10;i++)
                     82:                printk("%02x ",0xff & get_seg_byte(esp[1],(i+(char *)esp[0])));
                     83:        printk("\n\r");
                     84:        do_exit(11);            /* play segment exception */
                     85: }
                     86: 
                     87: void do_double_fault(long esp, long error_code)
                     88: {
                     89:        die("double fault",esp,error_code);
                     90: }
                     91: 
                     92: void do_general_protection(long esp, long error_code)
                     93: {
                     94:        die("general protection",esp,error_code);
                     95: }
                     96: 
                     97: void do_divide_error(long esp, long error_code)
                     98: {
                     99:        die("divide error",esp,error_code);
                    100: }
                    101: 
                    102: void do_int3(long * esp, long error_code,
                    103:                long fs,long es,long ds,
                    104:                long ebp,long esi,long edi,
                    105:                long edx,long ecx,long ebx,long eax)
                    106: {
                    107:        int tr;
                    108: 
                    109:        __asm__("str %%ax":"=a" (tr):"0" (0));
                    110:        printk("eax\t\tebx\t\tecx\t\tedx\n\r%8x\t%8x\t%8x\t%8x\n\r",
                    111:                eax,ebx,ecx,edx);
                    112:        printk("esi\t\tedi\t\tebp\t\tesp\n\r%8x\t%8x\t%8x\t%8x\n\r",
                    113:                esi,edi,ebp,(long) esp);
                    114:        printk("\n\rds\tes\tfs\ttr\n\r%4x\t%4x\t%4x\t%4x\n\r",
                    115:                ds,es,fs,tr);
                    116:        printk("EIP: %8x   CS: %4x  EFLAGS: %8x\n\r",esp[0],esp[1],esp[2]);
                    117: }
                    118: 
                    119: void do_nmi(long esp, long error_code)
                    120: {
                    121:        die("nmi",esp,error_code);
                    122: }
                    123: 
                    124: void do_debug(long esp, long error_code)
                    125: {
                    126:        die("debug",esp,error_code);
                    127: }
                    128: 
                    129: void do_overflow(long esp, long error_code)
                    130: {
                    131:        die("overflow",esp,error_code);
                    132: }
                    133: 
                    134: void do_bounds(long esp, long error_code)
                    135: {
                    136:        die("bounds",esp,error_code);
                    137: }
                    138: 
                    139: void do_invalid_op(long esp, long error_code)
                    140: {
                    141:        die("invalid operand",esp,error_code);
                    142: }
                    143: 
                    144: void do_device_not_available(long esp, long error_code)
                    145: {
                    146:        die("device not available",esp,error_code);
                    147: }
                    148: 
                    149: void do_coprocessor_segment_overrun(long esp, long error_code)
                    150: {
                    151:        die("coprocessor segment overrun",esp,error_code);
                    152: }
                    153: 
                    154: void do_invalid_TSS(long esp,long error_code)
                    155: {
                    156:        die("invalid TSS",esp,error_code);
                    157: }
                    158: 
                    159: void do_segment_not_present(long esp,long error_code)
                    160: {
                    161:        die("segment not present",esp,error_code);
                    162: }
                    163: 
                    164: void do_stack_segment(long esp,long error_code)
                    165: {
                    166:        die("stack segment",esp,error_code);
                    167: }
                    168: 
                    169: void do_coprocessor_error(long esp, long error_code)
                    170: {
1.1.1.2 ! root      171:        if (last_task_used_math != current)
        !           172:                return;
1.1       root      173:        die("coprocessor error",esp,error_code);
                    174: }
                    175: 
                    176: void do_reserved(long esp, long error_code)
                    177: {
1.1.1.2 ! root      178:        die("reserved (15,17-47) error",esp,error_code);
1.1       root      179: }
                    180: 
                    181: void trap_init(void)
                    182: {
                    183:        int i;
                    184: 
                    185:        set_trap_gate(0,&divide_error);
                    186:        set_trap_gate(1,&debug);
                    187:        set_trap_gate(2,&nmi);
                    188:        set_system_gate(3,&int3);       /* int3-5 can be called from all */
                    189:        set_system_gate(4,&overflow);
                    190:        set_system_gate(5,&bounds);
                    191:        set_trap_gate(6,&invalid_op);
                    192:        set_trap_gate(7,&device_not_available);
                    193:        set_trap_gate(8,&double_fault);
                    194:        set_trap_gate(9,&coprocessor_segment_overrun);
                    195:        set_trap_gate(10,&invalid_TSS);
                    196:        set_trap_gate(11,&segment_not_present);
                    197:        set_trap_gate(12,&stack_segment);
                    198:        set_trap_gate(13,&general_protection);
                    199:        set_trap_gate(14,&page_fault);
                    200:        set_trap_gate(15,&reserved);
                    201:        set_trap_gate(16,&coprocessor_error);
1.1.1.2 ! root      202:        for (i=17;i<48;i++)
1.1       root      203:                set_trap_gate(i,&reserved);
1.1.1.2 ! root      204:        set_trap_gate(45,&irq13);
        !           205:        outb_p(inb_p(0x21)&0xfb,0x21);
        !           206:        outb(inb_p(0xA1)&0xdf,0xA1);
        !           207:        set_trap_gate(39,&parallel_interrupt);
1.1       root      208: }

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