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ARCv2: fpu: preserve userspace fpu state

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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta
2020-01-17 15:04:03 -08:00
parent f05523aa7a
commit f45ba2bd6d
6 changed files with 68 additions and 12 deletions
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28
arch/arc/include/asm/fpu.h
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@@ -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 */