From f45ba2bd6da0dc8000aa7ea7a3858fb51608f766 Mon Sep 17 00:00:00 2001 From: Vineet Gupta Date: Fri, 17 Jan 2020 15:04:03 -0800 Subject: ARCv2: fpu: preserve userspace fpu state Signed-off-by: Vineet Gupta --- arch/arc/include/asm/arcregs.h | 2 ++ arch/arc/include/asm/fpu.h | 28 +++++++++++++++++++++++++++- 2 files changed, 29 insertions(+), 1 deletion(-) (limited to 'arch/arc/include/asm') 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 +#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 */ -- cgit v1.2.3