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Diffstat (limited to 'arch/mips/kernel/r4k_fpu.S')
-rw-r--r--arch/mips/kernel/r4k_fpu.S19
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/mips/kernel/r4k_fpu.S b/arch/mips/kernel/r4k_fpu.S
index 880fa6e841e..59c1577ecbb 100644
--- a/arch/mips/kernel/r4k_fpu.S
+++ b/arch/mips/kernel/r4k_fpu.S
@@ -114,6 +114,14 @@ LEAF(_save_fp_context32)
*/
LEAF(_restore_fp_context)
EX lw t0, SC_FPC_CSR(a0)
+
+ /* Fail if the CSR has exceptions pending */
+ srl t1, t0, 5
+ and t1, t0
+ andi t1, 0x1f << 7
+ bnez t1, fault
+ nop
+
#ifdef CONFIG_64BIT
EX ldc1 $f1, SC_FPREGS+8(a0)
EX ldc1 $f3, SC_FPREGS+24(a0)
@@ -157,6 +165,14 @@ LEAF(_restore_fp_context)
LEAF(_restore_fp_context32)
/* Restore an o32 sigcontext. */
EX lw t0, SC32_FPC_CSR(a0)
+
+ /* Fail if the CSR has exceptions pending */
+ srl t1, t0, 5
+ and t1, t0
+ andi t1, 0x1f << 7
+ bnez t1, fault
+ nop
+
EX ldc1 $f0, SC32_FPREGS+0(a0)
EX ldc1 $f2, SC32_FPREGS+16(a0)
EX ldc1 $f4, SC32_FPREGS+32(a0)
@@ -177,9 +193,10 @@ LEAF(_restore_fp_context32)
jr ra
li v0, 0 # success
END(_restore_fp_context32)
- .set reorder
#endif
+ .set reorder
+
.type fault@function
.ent fault
fault: li v0, -EFAULT # failure