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x86/fpu: Factor out the exception error code handling code

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Factor out the FPU error code handling code from traps.c and fpu/internal.h
and move them close to each other.

Also convert the helper functions to 'struct fpu *', which further simplifies
them.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
2015-04-30 09:29:38 +02:00
parent acd58a3ad0
commit e1cebad49c
3 changed files with 102 additions and 86 deletions
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33
arch/x86/include/asm/fpu/internal.h
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@@ -30,7 +30,8 @@ extern void fpu__init_system(struct cpuinfo_x86 *c);
extern void fpu__activate_curr(struct fpu *fpu);
extern void fpstate_init(struct fpu *fpu);
extern int dump_fpu(struct pt_regs *, struct user_i387_struct *);
extern int dump_fpu(struct pt_regs *, struct user_i387_struct *);
extern int fpu__exception_code(struct fpu *fpu, int trap_nr);
/*
* High level FPU state handling functions:
@@ -467,34 +468,4 @@ static inline void user_fpu_begin(void)
preempt_enable();
}
/*
* i387 state interaction
*/
static inline unsigned short get_fpu_cwd(struct task_struct *tsk)
{
if (cpu_has_fxsr) {
return tsk->thread.fpu.state.fxsave.cwd;
} else {
return (unsigned short)tsk->thread.fpu.state.fsave.cwd;
}
}
static inline unsigned short get_fpu_swd(struct task_struct *tsk)
{
if (cpu_has_fxsr) {
return tsk->thread.fpu.state.fxsave.swd;
} else {
return (unsigned short)tsk->thread.fpu.state.fsave.swd;
}
}
static inline unsigned short get_fpu_mxcsr(struct task_struct *tsk)
{
if (cpu_has_xmm) {
return tsk->thread.fpu.state.fxsave.mxcsr;
} else {
return MXCSR_DEFAULT;
}
}
#endif /* _ASM_X86_FPU_INTERNAL_H */