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Commit 6d667106 authored by Chris Dearman's avatar Chris Dearman Committed by Ralf Baechle
Browse files

[MIPS] Check FCSR for pending interrupts before restoring from a context. 



Signed-off-by: default avatarChris Dearman <chris@mips.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent b86b30f8

arch/mips/kernel/r4k_fpu.S

+16 −0
Original line number Diff line number Diff line
@@ -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)