root/kernel/math/math_emulate.c

/* */

DEFINITIONS

1. math_emulate
2. math_error

   1 /*
   2  * linux/kernel/math/math_emulate.c
   3  *
   4  * (C) 1991 Linus Torvalds
   5  */
   6 
   7 /*
   8  * This directory should contain the math-emulation code.
   9  * Currently only results in a signal.
  10  */
  11 
  12 #include <signal.h>
  13 
  14 #include <linux/sched.h>
  15 #include <linux/kernel.h>
  16 #include <asm/segment.h>
  17 
  18 void math_emulate(long edi, long esi, long ebp, long sys_call_ret,
     /*  */
  19         long eax,long ebx,long ecx,long edx,
  20         unsigned short fs,unsigned short es,unsigned short ds,
  21         unsigned long eip,unsigned short cs,unsigned long eflags,
  22         unsigned short ss, unsigned long esp)
  23 {
  24         unsigned char first, second;
  25 
  26 /* 0x0007 means user code space */
  27         if (cs != 0x000F) {
  28                 printk("math_emulate: %04x:%08x\n\r",cs,eip);
  29                 panic("Math emulation needed in kernel");
  30         }
  31         first = get_fs_byte((char *)((*&eip)++));
  32         second = get_fs_byte((char *)((*&eip)++));
  33         printk("%04x:%08x %02x %02x\n\r",cs,eip-2,first,second);
  34         current->signal |= 1<<(SIGFPE-1);
  35 }
  36 
  37 void math_error(void)
     /*  */
  38 {
  39         __asm__("fnclex");
  40         if (last_task_used_math)
  41                 last_task_used_math->signal |= 1<<(SIGFPE-1);
  42 }

/* */