--- linux/kernel/traps.c 2018/04/24 18:00:41 1.1.1.1 +++ linux/kernel/traps.c 2018/04/24 18:13:02 1.1.1.6 @@ -1,16 +1,24 @@ /* + * linux/kernel/traps.c + * + * Copyright (C) 1991, 1992 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 - #include #include #include +#include +#include + #include #include +#include #define get_seg_byte(seg,addr) ({ \ register char __res; \ @@ -29,8 +37,6 @@ register unsigned short __res; \ __asm__("mov %%fs,%%ax":"=a" (__res):); \ __res;}) -int do_exit(long code); - void page_exception(void); void divide_error(void); @@ -50,121 +56,126 @@ void general_protection(void); void page_fault(void); void coprocessor_error(void); void reserved(void); +void alignment_check(void); -static void die(char * str,long esp_ptr,long nr) +static void die_if_kernel(char * str,long esp_ptr,long nr) { long * esp = (long *) esp_ptr; int i; + if ((0xffff & esp[1]) == 0xf) + return; 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("EIP: %04x:%p\nEFLAGS: %p\n", 0xffff & esp[1],esp[0],esp[2]); 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 */ + do_exit(SIGSEGV); } void do_double_fault(long esp, long error_code) { - die("double fault",esp,error_code); + send_sig(SIGSEGV, current, 1); + die_if_kernel("double fault",esp,error_code); } void do_general_protection(long esp, long error_code) { - die("general protection",esp,error_code); + send_sig(SIGSEGV, current, 1); + die_if_kernel("general protection",esp,error_code); +} + +void do_alignment_check(long esp, long error_code) +{ + send_sig(SIGSEGV, current, 1); + die_if_kernel("alignment check",esp,error_code); } void do_divide_error(long esp, long error_code) { - die("divide error",esp,error_code); + send_sig(SIGFPE, current, 1); + die_if_kernel("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_int3(long esp, long error_code) +{ + send_sig(SIGTRAP, current, 1); + die_if_kernel("int3",esp,error_code); } void do_nmi(long esp, long error_code) { - die("nmi",esp,error_code); + printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n"); } void do_debug(long esp, long error_code) { - die("debug",esp,error_code); + send_sig(SIGTRAP, current, 1); + die_if_kernel("debug",esp,error_code); } void do_overflow(long esp, long error_code) { - die("overflow",esp,error_code); + send_sig(SIGSEGV, current, 1); + die_if_kernel("overflow",esp,error_code); } void do_bounds(long esp, long error_code) { - die("bounds",esp,error_code); + send_sig(SIGSEGV, current, 1); + die_if_kernel("bounds",esp,error_code); } void do_invalid_op(long esp, long error_code) { - die("invalid operand",esp,error_code); + send_sig(SIGILL, current, 1); + die_if_kernel("invalid operand",esp,error_code); } void do_device_not_available(long esp, long error_code) { - die("device not available",esp,error_code); + send_sig(SIGSEGV, current, 1); + die_if_kernel("device not available",esp,error_code); } void do_coprocessor_segment_overrun(long esp, long error_code) { - die("coprocessor segment overrun",esp,error_code); + send_sig(SIGFPE, last_task_used_math, 1); + die_if_kernel("coprocessor segment overrun",esp,error_code); } void do_invalid_TSS(long esp,long error_code) { - die("invalid TSS",esp,error_code); + send_sig(SIGSEGV, current, 1); + die_if_kernel("invalid TSS",esp,error_code); } void do_segment_not_present(long esp,long error_code) { - die("segment not present",esp,error_code); + send_sig(SIGSEGV, current, 1); + die_if_kernel("segment not present",esp,error_code); } void do_stack_segment(long esp,long error_code) { - die("stack segment",esp,error_code); + send_sig(SIGSEGV, current, 1); + die_if_kernel("stack segment",esp,error_code); } void do_coprocessor_error(long esp, long error_code) { - die("coprocessor error",esp,error_code); + send_sig(SIGFPE, last_task_used_math, 1); + __asm__("fnclex"); } void do_reserved(long esp, long error_code) { - die("reserved (15,17-31) error",esp,error_code); + send_sig(SIGSEGV, current, 1); + die_if_kernel("reserved (15,17-47) error",esp,error_code); } void trap_init(void) @@ -188,12 +199,7 @@ void trap_init(void) 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(17,&alignment_check); + for (i=18;i<48;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");*/ } -