diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2006-02-20 16:02:24 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 01:13:48 -0800 |
| commit | 4e74ae800bafe79d4aaa529bc5d52425757c0115 (patch) | |
| tree | b6d0a52da8a316eadaa5651ffa73ea3e3435d59e | |
| parent | f5deb807b8cd5c8fe48cbb4f7f5dd70cfbdb1178 (diff) | |
[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>
| -rw-r--r-- | arch/sparc64/math-emu/math.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/arch/sparc64/math-emu/math.c b/arch/sparc64/math-emu/math.c index 2ae05cd7b77..a93a3664c85 100644 --- a/arch/sparc64/math-emu/math.c +++ b/arch/sparc64/math-emu/math.c @@ -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: |