diff options
Diffstat (limited to 'linux/kernel/traps.c')
| -rw-r--r-- | linux/kernel/traps.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/linux/kernel/traps.c b/linux/kernel/traps.c new file mode 100644 index 0000000..b6e8bdb --- /dev/null +++ b/linux/kernel/traps.c @@ -0,0 +1,199 @@ +/* + * '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> + +#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;}) + +#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;}) + +#define _fs() ({ \ +register unsigned short __res; \ +__asm__("mov %%fs,%%ax":"=a" (__res):); \ +__res;}) + +int do_exit(long code); + +void page_exception(void); + +void divide_error(void); +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); +void coprocessor_error(void); +void reserved(void); + +static void die(char * str,long esp_ptr,long nr) +{ + 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_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) +{ + 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) +{ + die("coprocessor error",esp,error_code); +} + +void do_reserved(long esp, long error_code) +{ + die("reserved (15,17-31) error",esp,error_code); +} + +void trap_init(void) +{ + 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); + for (i=17;i<32;i++) + set_trap_gate(i,&reserved); +/* __asm__("movl $0x3ff000,%%eax\n\t" + "movl %%eax,%%db0\n\t" + "movl $0x000d0303,%%eax\n\t" + "movl %%eax,%%db7" + :::"ax");*/ +} + |