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sh64: Use the shared FPU state restorer. 

This kills off the sh64-specific state restorer and switches over to
the generic one.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-01-19 15:55:27 +09:00
parent 88ea1a445a
commit d6db8888c8
3 changed files with 8 additions and 62 deletions
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4
arch/sh/kernel/cpu/sh5/entry.S
View File

@ -1124,7 +1124,7 @@ fpu_error_or_IRQA:
pta its_IRQ, tr0
beqi/l r4, EVENT_INTERRUPT, tr0
#ifdef CONFIG_SH_FPU
movi do_fpu_state_restore, r6
movi fpu_state_restore_trap_handler, r6
#else
movi do_exception_error, r6
#endif
@ -1135,7 +1135,7 @@ fpu_error_or_IRQB:
pta its_IRQ, tr0
beqi/l r4, EVENT_INTERRUPT, tr0
#ifdef CONFIG_SH_FPU
movi do_fpu_state_restore, r6
movi fpu_state_restore_trap_handler, r6
#else
movi do_exception_error, r6
#endif

63
arch/sh/kernel/cpu/sh5/fpu.c
View File

@ -15,24 +15,6 @@
#include <linux/sched.h>
#include <linux/signal.h>
#include <asm/processor.h>
#include <asm/user.h>
#include <asm/io.h>
#include <asm/fpu.h>
/*
* Initially load the FPU with signalling NANS. This bit pattern
* has the property that no matter whether considered as single or as
* double precision, it still represents a signalling NAN.
*/
#define sNAN64 0xFFFFFFFFFFFFFFFFULL
#define sNAN32 0xFFFFFFFFUL
static union thread_xstate init_fpuregs = {
.hardfpu = {
.fp_regs = { [0 ... 63] = sNAN32 },
.fpscr = FPSCR_INIT
}
};
void save_fpu(struct task_struct *tsk)
{
@ -76,8 +58,7 @@ void save_fpu(struct task_struct *tsk)
: "memory");
}
static inline void
fpload(struct sh_fpu_hard_struct *fpregs)
void restore_fpu(struct task_struct *tsk)
{
asm volatile("fld.p %0, (0*8), fp0\n\t"
"fld.p %0, (1*8), fp2\n\t"
@ -116,16 +97,11 @@ fpload(struct sh_fpu_hard_struct *fpregs)
"fld.p %0, (31*8), fp62\n\t"
: /* no output */
: "r" (fpregs) );
: "r" (&tsk->thread.xstate->hardfpu)
: "memory");
}
void fpinit(struct sh_fpu_hard_struct *fpregs)
{
*fpregs = init_fpuregs.hardfpu;
}
asmlinkage void
do_fpu_error(unsigned long ex, struct pt_regs *regs)
asmlinkage void do_fpu_error(unsigned long ex, struct pt_regs *regs)
{
struct task_struct *tsk = current;
@ -133,35 +109,6 @@ do_fpu_error(unsigned long ex, struct pt_regs *regs)
tsk->thread.trap_no = 11;
tsk->thread.error_code = 0;
force_sig(SIGFPE, tsk);
}
asmlinkage void
do_fpu_state_restore(unsigned long ex, struct pt_regs *regs)
{
void die(const char *str, struct pt_regs *regs, long err);
if (! user_mode(regs))
die("FPU used in kernel", regs, ex);
regs->sr &= ~SR_FD;
if (last_task_used_math == current)
return;
enable_fpu();
if (last_task_used_math != NULL)
/* Other processes fpu state, save away */
save_fpu(last_task_used_math);
last_task_used_math = current;
if (used_math()) {
fpload(&current->thread.xstate->hardfpu);
} else {
/* First time FPU user. */
fpload(&init_fpuregs.hardfpu);
set_used_math();
}
disable_fpu();
}

3
arch/sh/kernel/ptrace_64.c
View File

@ -114,8 +114,7 @@ put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
if (!tsk_used_math(task)) {
fpinit(&task->thread.xstate->hardfpu);
set_stopped_child_used_math(task);
init_fpu(task);
} else if (last_task_used_math == task) {
enable_fpu();
save_fpu(task);