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43 lines
1023 B
43 lines
1023 B
2 years ago
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/*
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* linux/kernel/math/math_emulate.c
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*
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* (C) 1991 Linus Torvalds
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*/
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/*
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* This directory should contain the math-emulation code.
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* Currently only results in a signal.
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*/
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#include <signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <asm/segment.h>
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void math_emulate(long edi, long esi, long ebp, long sys_call_ret,
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long eax,long ebx,long ecx,long edx,
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unsigned short fs,unsigned short es,unsigned short ds,
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unsigned long eip,unsigned short cs,unsigned long eflags,
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unsigned short ss, unsigned long esp)
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{
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unsigned char first, second;
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/* 0x0007 means user code space */
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if (cs != 0x000F) {
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printk("math_emulate: %04x:%08x\n\r",cs,eip);
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panic("Math emulation needed in kernel");
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}
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first = get_fs_byte((char *)((*&eip)++));
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second = get_fs_byte((char *)((*&eip)++));
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printk("%04x:%08x %02x %02x\n\r",cs,eip-2,first,second);
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current->signal |= 1<<(SIGFPE-1);
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}
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void math_error(void)
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{
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__asm__("fnclex");
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if (last_task_used_math)
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last_task_used_math->signal |= 1<<(SIGFPE-1);
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}
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