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authorDavid S. Miller <davem@sunset.davemloft.net>2006-02-20 16:02:24 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-20 01:13:48 -0800
commit4e74ae800bafe79d4aaa529bc5d52425757c0115 (patch)
treeb6d0a52da8a316eadaa5651ffa73ea3e3435d59e /arch/sparc64
parentf5deb807b8cd5c8fe48cbb4f7f5dd70cfbdb1178 (diff)
downloadlinux-2.6.34-ux500-4e74ae800bafe79d4aaa529bc5d52425757c0115.tar.gz
[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>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/math-emu/math.c25
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: