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[SPARC64]: Handle unimplemented FPU square-root on Niagara. 

The math-emu code only expects unfinished fpop traps when
emulating FPU sqrt instructions on pre-Niagara chips.
On Niagara we can get unimplemented fpop, so handle that.

Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
David S. Miller 2006-02-20 16:02:24 -08:00
parent f5deb807b8
commit 4e74ae800b
1 changed files with 23 additions and 2 deletions
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25
arch/sparc64/math-emu/math.c
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@ -206,9 +206,30 @@ int do_mathemu(struct pt_regs *regs, struct fpustate *f)
case FSTOQ: TYPE(3,3,1,1,1,0,0); break;
case FDTOQ: TYPE(3,3,1,2,1,0,0); break;
case FQTOI: TYPE(3,1,0,3,1,0,0); break;
/* We can get either unimplemented or unfinished
* for these cases. Pre-Niagara systems generate
* unfinished fpop for SUBNORMAL cases, and Niagara
* always gives unimplemented fpop for fsqrt{s,d}.
*/
case FSQRTS: {
unsigned long x = current_thread_info()->xfsr[0];
x = (x >> 14) & 0xf;
TYPE(x,1,1,1,1,0,0);
printk("math-emu: type is %08x\n", type);
break;
}
case FSQRTD: {
unsigned long x = current_thread_info()->xfsr[0];
x = (x >> 14) & 0xf;
TYPE(x,2,1,2,1,0,0);
break;
}
/* SUBNORMAL - ftt == 2 */
case FSQRTS: TYPE(2,1,1,1,1,0,0); break;
case FSQRTD: TYPE(2,2,1,2,1,0,0); break;
case FADDD:
case FSUBD:
case FMULD: