Annotation of linux/kernel/math/math_emulate.c, revision 1.1.1.1

1.1       root        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: }

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