[PATCH] ARC: fp: set FPU_STATUS.FWE to enable FPU_STATUS update on context switch

[Vineet Gupta]

FPU_STATUS register contains FP exception flags bits which are updated
as side-effect of FP instructions but can also be manually wiggled such
as by glibc C99 functions fe{raise,clear,test}except() etc.
To effect the update, the programming model requires OR'ing FWE
bit(231). This bit is write-only and RAZ, meaning it is effectively
auto-cleared after a write and thus needs to be set everytime which
is how glibc implements this.

However there's another usecase of FPU_STATUS update, at the time of
Linux task switch when incoming task value needs to be programmed into
the register. This was added as part of f45ba2bd6da0dc ("ARCv2:
fpu: preserve userspace fpu state") which however missing the OR'ing
with FWE bit, meaning the new value is not effectively being written at
all, which is what this patch fixes. This was not caught in interm glibc
testing as the race window which relies on a specific exception bit to be
set/clear is really small and will end up causing extremely hard to
reproduce/debug issues.

Fortunately this was caught by glibc's math/test-fenv-tls test which
repeatedly set/clear exception flags in a big loop, concurrently in main
program and also in a thread.

Fixes: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/54
Fixes: f45ba2bd6da0dc ("ARCv2: fpu: preserve userspace fpu state")
Cc: stable@xxxxxxxxxxxxxxx	#5.6+
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
---
 arch/arc/kernel/fpu.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/arc/kernel/fpu.c b/arch/arc/kernel/fpu.c
index c67c0f0f5f77..ec640219d989 100644
--- a/arch/arc/kernel/fpu.c
+++ b/arch/arc/kernel/fpu.c
@@ -57,23 +57,26 @@ void fpu_save_restore(struct task_struct *prev, struct task_struct *next)
 
 void fpu_init_task(struct pt_regs *regs)
 {
+	const unsigned int fwe = 0x80000000;
+
 	/* default rounding mode */
 	write_aux_reg(ARC_REG_FPU_CTRL, 0x100);
 
-	/* set "Write enable" to allow explicit write to exception flags */
-	write_aux_reg(ARC_REG_FPU_STATUS, 0x80000000);
+	/* Initialize to zero: setting requires FWE be set */
+	write_aux_reg(ARC_REG_FPU_STATUS, fwe);
 }
 
 void fpu_save_restore(struct task_struct *prev, struct task_struct *next)
 {
 	struct arc_fpu *save = &prev->thread.fpu;
 	struct arc_fpu *restore = &next->thread.fpu;
+	const unsigned int fwe = 0x80000000;
 
 	save->ctrl = read_aux_reg(ARC_REG_FPU_CTRL);
 	save->status = read_aux_reg(ARC_REG_FPU_STATUS);
 
 	write_aux_reg(ARC_REG_FPU_CTRL, restore->ctrl);
-	write_aux_reg(ARC_REG_FPU_STATUS, restore->status);
+	write_aux_reg(ARC_REG_FPU_STATUS, (fwe | restore->status));
 }
 
 #endif
-- 
2.25.1