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authorVineet Gupta <vgupta@synopsys.com>2020-01-17 15:04:03 -0800
committerVineet Gupta <vgupta@synopsys.com>2020-01-17 16:53:44 -0800
commitf45ba2bd6da0dc8000aa7ea7a3858fb51608f766 (patch)
tree3be8113cb45459531bc5ffee5bbbb1de38d5d234 /arch/arc/include
parentf05523aa7a1e63bfada5e222c0a57e02dbd4fcfa (diff)
downloadlinux-f45ba2bd6da0dc8000aa7ea7a3858fb51608f766.tar.gz
ARCv2: fpu: preserve userspace fpu state
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include')
-rw-r--r--arch/arc/include/asm/arcregs.h2
-rw-r--r--arch/arc/include/asm/fpu.h28
2 files changed, 29 insertions, 1 deletions
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
index 5134f0baf33c..f7e432448e4b 100644
--- a/arch/arc/include/asm/arcregs.h
+++ b/arch/arc/include/asm/arcregs.h
@@ -39,6 +39,8 @@
#define ARC_REG_CLUSTER_BCR 0xcf
#define ARC_REG_AUX_ICCM 0x208 /* ICCM Base Addr (ARCv2) */
#define ARC_REG_LPB_CTRL 0x488 /* ARCv2 Loop Buffer control */
+#define ARC_REG_FPU_CTRL 0x300
+#define ARC_REG_FPU_STATUS 0x301
/* Common for ARCompact and ARCv2 status register */
#define ARC_REG_STATUS32 0x0A
diff --git a/arch/arc/include/asm/fpu.h b/arch/arc/include/asm/fpu.h
index de467423d99b..64347250fdf5 100644
--- a/arch/arc/include/asm/fpu.h
+++ b/arch/arc/include/asm/fpu.h
@@ -11,6 +11,8 @@
#include <asm/ptrace.h>
+#ifdef CONFIG_ISA_ARCOMPACT
+
/* These DPFP regs need to be saved/restored across ctx-sw */
struct arc_fpu {
struct {
@@ -18,11 +20,35 @@ struct arc_fpu {
} aux_dpfp[2];
};
-extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
+#define fpu_init_task(regs)
#else
+/*
+ * ARCv2 FPU Control aux register
+ * - bits to enable Traps on Exceptions
+ * - Rounding mode
+ *
+ * ARCv2 FPU Status aux register
+ * - FPU exceptions flags (Inv, Div-by-Zero, overflow, underflow, inexact)
+ * - Flag Write Enable to clear flags explicitly (vs. by fpu instructions
+ * only
+ */
+
+struct arc_fpu {
+ unsigned int ctrl, status;
+};
+
+extern void fpu_init_task(struct pt_regs *regs);
+
+#endif /* !CONFIG_ISA_ARCOMPACT */
+
+extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
+
+#else /* !CONFIG_ARC_FPU_SAVE_RESTORE */
+
#define fpu_save_restore(p, n)
+#define fpu_init_task(regs)
#endif /* CONFIG_ARC_FPU_SAVE_RESTORE */