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MN10300: Make the FPU operate in non-lazy mode under SMP 

Make the FPU operate in non-lazy mode under SMP so that when the process that
is currently using the FPU migrates to a different CPU, we don't have to ping
its previous CPU to flush the FPU context.

Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Akira Takeuchi 2010-10-27 17:28:52 +01:00 committed by David Howells
parent 965ea4bbb9
commit 278d91c460
14 changed files with 443 additions and 251 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/mn10300/Kconfig
View File

@ -140,6 +140,21 @@ config FPU
default y
depends on MN10300_PROC_MN103E010
config LAZY_SAVE_FPU
bool "Save FPU state lazily"
default y
depends on FPU && !SMP
help
Enable this to be lazy in the saving of the FPU state to the owning
task's thread struct. This is useful if most tasks on the system
don't use the FPU as only those tasks that use it will pass it
between them, and the state needn't be saved for a task that isn't
using it.
This can't be so easily used on SMP as the process that owns the FPU
state on a CPU may be currently running on another CPU, so for the
moment, it is disabled.
source "arch/mn10300/mm/Kconfig.cache"
config MN10300_TLB_USE_PIDR

2
arch/mn10300/include/asm/elf.h
View File

@ -47,8 +47,6 @@ typedef struct {
u_int32_t fpcr;
} elf_fpregset_t;
extern int dump_fpu(struct pt_regs *, elf_fpregset_t *);
/*
* This is used to ensure we don't load something for the wrong architecture
*/

1
arch/mn10300/include/asm/exceptions.h
View File

@ -101,7 +101,6 @@ extern asmlinkage void dtlb_aerror(void);
extern asmlinkage void raw_bus_error(void);
extern asmlinkage void double_fault(void);
extern asmlinkage int system_call(struct pt_regs *);
extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code);
extern asmlinkage void nmi(struct pt_regs *, enum exception_code);
extern asmlinkage void uninitialised_exception(struct pt_regs *,
enum exception_code);

157
arch/mn10300/include/asm/fpu.h
View File

@ -12,74 +12,125 @@
#ifndef _ASM_FPU_H
#define _ASM_FPU_H
#include <asm/processor.h>
#ifndef __ASSEMBLY__
#include <linux/sched.h>
#include <asm/exceptions.h>
#include <asm/sigcontext.h>
#include <asm/user.h>
#ifdef __KERNEL__
/* the task that owns the FPU state */
extern asmlinkage void fpu_disabled(void);
#ifdef CONFIG_FPU
#ifdef CONFIG_LAZY_SAVE_FPU
/* the task that currently owns the FPU state */
extern struct task_struct *fpu_state_owner;
#endif
#define set_using_fpu(tsk) \
do { \
(tsk)->thread.fpu_flags |= THREAD_USING_FPU; \
} while (0)
#if (THREAD_USING_FPU & ~0xff)
#error THREAD_USING_FPU must be smaller than 0x100.
#endif
#define clear_using_fpu(tsk) \
do { \
(tsk)->thread.fpu_flags &= ~THREAD_USING_FPU; \
} while (0)
static inline void set_using_fpu(struct task_struct *tsk)
{
asm volatile(
"bset %0,(0,%1)"
:
: "i"(THREAD_USING_FPU), "a"(&tsk->thread.fpu_flags)
: "memory", "cc");
}
static inline void clear_using_fpu(struct task_struct *tsk)
{
asm volatile(
"bclr %0,(0,%1)"
:
: "i"(THREAD_USING_FPU), "a"(&tsk->thread.fpu_flags)
: "memory", "cc");
}
#define is_using_fpu(tsk) ((tsk)->thread.fpu_flags & THREAD_USING_FPU)
#define unlazy_fpu(tsk) \
do { \
preempt_disable(); \
if (fpu_state_owner == (tsk)) \
fpu_save(&tsk->thread.fpu_state); \
preempt_enable(); \
} while (0)
#define exit_fpu() \
do { \
struct task_struct *__tsk = current; \
preempt_disable(); \
if (fpu_state_owner == __tsk) \
fpu_state_owner = NULL; \
preempt_enable(); \
} while (0)
#define flush_fpu() \
do { \
struct task_struct *__tsk = current; \
preempt_disable(); \
if (fpu_state_owner == __tsk) { \
fpu_state_owner = NULL; \
__tsk->thread.uregs->epsw &= ~EPSW_FE; \
} \
preempt_enable(); \
clear_using_fpu(__tsk); \
} while (0)
extern asmlinkage void fpu_init_state(void);
extern asmlinkage void fpu_kill_state(struct task_struct *);
extern asmlinkage void fpu_disabled(struct pt_regs *, enum exception_code);
extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code);
#ifdef CONFIG_FPU
extern asmlinkage void fpu_invalid_op(struct pt_regs *, enum exception_code);
extern asmlinkage void fpu_init_state(void);
extern asmlinkage void fpu_save(struct fpu_state_struct *);
extern asmlinkage void fpu_restore(struct fpu_state_struct *);
#else
#define fpu_save(a)
#define fpu_restore(a)
#endif /* CONFIG_FPU */
/*
* signal frame handlers
*/
extern int fpu_setup_sigcontext(struct fpucontext *buf);
extern int fpu_restore_sigcontext(struct fpucontext *buf);
static inline void unlazy_fpu(struct task_struct *tsk)
{
preempt_disable();
#ifndef CONFIG_LAZY_SAVE_FPU
if (tsk->thread.fpu_flags & THREAD_HAS_FPU) {
fpu_save(&tsk->thread.fpu_state);
tsk->thread.fpu_flags &= ~THREAD_HAS_FPU;
tsk->thread.uregs->epsw &= ~EPSW_FE;
}
#else
if (fpu_state_owner == tsk)
fpu_save(&tsk->thread.fpu_state);
#endif
preempt_enable();
}
static inline void exit_fpu(void)
{
#ifdef CONFIG_LAZY_SAVE_FPU
struct task_struct *tsk = current;
preempt_disable();
if (fpu_state_owner == tsk)
fpu_state_owner = NULL;
preempt_enable();
#endif
}
static inline void flush_fpu(void)
{
struct task_struct *tsk = current;
preempt_disable();
#ifndef CONFIG_LAZY_SAVE_FPU
if (tsk->thread.fpu_flags & THREAD_HAS_FPU) {
tsk->thread.fpu_flags &= ~THREAD_HAS_FPU;
tsk->thread.uregs->epsw &= ~EPSW_FE;
}
#else
if (fpu_state_owner == tsk) {
fpu_state_owner = NULL;
tsk->thread.uregs->epsw &= ~EPSW_FE;
}
#endif
preempt_enable();
clear_using_fpu(tsk);
}
#else /* CONFIG_FPU */
extern asmlinkage
void unexpected_fpu_exception(struct pt_regs *, enum exception_code);
#define fpu_invalid_op unexpected_fpu_exception
#define fpu_exception unexpected_fpu_exception
struct task_struct;
struct fpu_state_struct;
static inline bool is_using_fpu(struct task_struct *tsk) { return false; }
static inline void set_using_fpu(struct task_struct *tsk) {}
static inline void clear_using_fpu(struct task_struct *tsk) {}
static inline void fpu_init_state(void) {}
static inline void fpu_save(struct fpu_state_struct *s) {}
static inline void fpu_kill_state(struct task_struct *tsk) {}
static inline void unlazy_fpu(struct task_struct *tsk) {}
static inline void exit_fpu(void) {}
static inline void flush_fpu(void) {}
static inline int fpu_setup_sigcontext(struct fpucontext *buf) { return 0; }
static inline int fpu_restore_sigcontext(struct fpucontext *buf) { return 0; }
#endif /* CONFIG_FPU */
#endif /* __KERNEL__ */
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_FPU_H */

1
arch/mn10300/include/asm/processor.h
View File

@ -95,6 +95,7 @@ struct thread_struct {
struct pt_regs *__frame;
unsigned long fpu_flags;
#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
#define THREAD_HAS_FPU 0x00000002 /* T if this task owns the FPU right now */
struct fpu_state_struct fpu_state;
};

16
arch/mn10300/include/asm/system.h
View File

@ -19,6 +19,21 @@
#include <linux/kernel.h>
#include <linux/irqflags.h>
#if !defined(CONFIG_LAZY_SAVE_FPU)
struct fpu_state_struct;
extern asmlinkage void fpu_save(struct fpu_state_struct *);
#define switch_fpu(prev, next) \
do { \
if ((prev)->thread.fpu_flags & THREAD_HAS_FPU) { \
(prev)->thread.fpu_flags &= ~THREAD_HAS_FPU; \
(prev)->thread.uregs->epsw &= ~EPSW_FE; \
fpu_save(&(prev)->thread.fpu_state); \
} \
} while (0)
#else
#define switch_fpu(prev, next) do {} while (0)
#endif
struct task_struct;
struct thread_struct;
@ -30,6 +45,7 @@ struct task_struct *__switch_to(struct thread_struct *prev,
/* context switching is now performed out-of-line in switch_to.S */
#define switch_to(prev, next, last) \
do { \
switch_fpu(prev, next); \
current->thread.wchan = (u_long) __builtin_return_address(0); \
(last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \
mb(); \

8
arch/mn10300/kernel/Makefile
View File

@ -3,13 +3,15 @@
#
extra-y := head.o init_task.o vmlinux.lds
obj-y := process.o signal.o entry.o fpu.o traps.o irq.o \
fpu-obj-y := fpu-nofpu.o fpu-nofpu-low.o
fpu-obj-$(CONFIG_FPU) := fpu.o fpu-low.o
obj-y := process.o signal.o entry.o traps.o irq.o \
ptrace.o setup.o time.o sys_mn10300.o io.o kthread.o \
switch_to.o mn10300_ksyms.o kernel_execve.o
switch_to.o mn10300_ksyms.o kernel_execve.o $(fpu-obj-y)
obj-$(CONFIG_MN10300_WD_TIMER) += mn10300-watchdog.o mn10300-watchdog-low.o
obj-$(CONFIG_FPU) += fpu-low.o
obj-$(CONFIG_MN10300_TTYSM) += mn10300-serial.o mn10300-serial-low.o \
mn10300-debug.o

9
arch/mn10300/kernel/asm-offsets.c
View File

@ -67,6 +67,15 @@ void foo(void)
OFFSET(THREAD_A3, thread_struct, a3);
OFFSET(THREAD_USP, thread_struct, usp);
OFFSET(THREAD_FRAME, thread_struct, __frame);
#ifdef CONFIG_FPU
OFFSET(THREAD_FPU_FLAGS, thread_struct, fpu_flags);
OFFSET(THREAD_FPU_STATE, thread_struct, fpu_state);
DEFINE(__THREAD_USING_FPU, THREAD_USING_FPU);
DEFINE(__THREAD_HAS_FPU, THREAD_HAS_FPU);
#endif /* CONFIG_FPU */
BLANK();
OFFSET(TASK_THREAD, task_struct, thread);
BLANK();
DEFINE(CLONE_VM_asm, CLONE_VM);

273
arch/mn10300/kernel/fpu-low.S
View File

@ -8,25 +8,14 @@
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/linkage.h>
#include <asm/cpu-regs.h>
#include <asm/smp.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
#include <asm/frame.inc>
###############################################################################
#
# void fpu_init_state(void)
# - initialise the FPU
#
###############################################################################
.globl fpu_init_state
.type fpu_init_state,@function
fpu_init_state:
mov epsw,d0
or EPSW_FE,epsw
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
nop
#endif
.macro FPU_INIT_STATE_ALL
fmov 0,fs0
fmov fs0,fs1
fmov fs0,fs2
@ -60,7 +49,100 @@ fpu_init_state:
fmov fs0,fs30
fmov fs0,fs31
fmov FPCR_INIT,fpcr
.endm
.macro FPU_SAVE_ALL areg,dreg
fmov fs0,(\areg+)
fmov fs1,(\areg+)
fmov fs2,(\areg+)
fmov fs3,(\areg+)
fmov fs4,(\areg+)
fmov fs5,(\areg+)
fmov fs6,(\areg+)
fmov fs7,(\areg+)
fmov fs8,(\areg+)
fmov fs9,(\areg+)
fmov fs10,(\areg+)
fmov fs11,(\areg+)
fmov fs12,(\areg+)
fmov fs13,(\areg+)
fmov fs14,(\areg+)
fmov fs15,(\areg+)
fmov fs16,(\areg+)
fmov fs17,(\areg+)
fmov fs18,(\areg+)
fmov fs19,(\areg+)
fmov fs20,(\areg+)
fmov fs21,(\areg+)
fmov fs22,(\areg+)
fmov fs23,(\areg+)
fmov fs24,(\areg+)
fmov fs25,(\areg+)
fmov fs26,(\areg+)
fmov fs27,(\areg+)
fmov fs28,(\areg+)
fmov fs29,(\areg+)
fmov fs30,(\areg+)
fmov fs31,(\areg+)
fmov fpcr,\dreg
mov \dreg,(\areg)
.endm
.macro FPU_RESTORE_ALL areg,dreg
fmov (\areg+),fs0
fmov (\areg+),fs1
fmov (\areg+),fs2
fmov (\areg+),fs3
fmov (\areg+),fs4
fmov (\areg+),fs5
fmov (\areg+),fs6
fmov (\areg+),fs7
fmov (\areg+),fs8
fmov (\areg+),fs9
fmov (\areg+),fs10
fmov (\areg+),fs11
fmov (\areg+),fs12
fmov (\areg+),fs13
fmov (\areg+),fs14
fmov (\areg+),fs15
fmov (\areg+),fs16
fmov (\areg+),fs17
fmov (\areg+),fs18
fmov (\areg+),fs19
fmov (\areg+),fs20
fmov (\areg+),fs21
fmov (\areg+),fs22
fmov (\areg+),fs23
fmov (\areg+),fs24
fmov (\areg+),fs25
fmov (\areg+),fs26
fmov (\areg+),fs27
fmov (\areg+),fs28
fmov (\areg+),fs29
fmov (\areg+),fs30
fmov (\areg+),fs31
mov (\areg),\dreg
fmov \dreg,fpcr
.endm
###############################################################################
#
# void fpu_init_state(void)
# - initialise the FPU
#
###############################################################################
.globl fpu_init_state
.type fpu_init_state,@function
fpu_init_state:
mov epsw,d0
or EPSW_FE,epsw
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
nop
#endif
FPU_INIT_STATE_ALL
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
@ -89,40 +171,7 @@ fpu_save:
nop
#endif
mov d0,a0
fmov fs0,(a0+)
fmov fs1,(a0+)
fmov fs2,(a0+)
fmov fs3,(a0+)
fmov fs4,(a0+)
fmov fs5,(a0+)
fmov fs6,(a0+)
fmov fs7,(a0+)
fmov fs8,(a0+)
fmov fs9,(a0+)
fmov fs10,(a0+)
fmov fs11,(a0+)
fmov fs12,(a0+)
fmov fs13,(a0+)
fmov fs14,(a0+)
fmov fs15,(a0+)
fmov fs16,(a0+)
fmov fs17,(a0+)
fmov fs18,(a0+)
fmov fs19,(a0+)
fmov fs20,(a0+)
fmov fs21,(a0+)
fmov fs22,(a0+)
fmov fs23,(a0+)
fmov fs24,(a0+)
fmov fs25,(a0+)
fmov fs26,(a0+)
fmov fs27,(a0+)
fmov fs28,(a0+)
fmov fs29,(a0+)
fmov fs30,(a0+)
fmov fs31,(a0+)
fmov fpcr,d0
mov d0,(a0)
FPU_SAVE_ALL a0,d0
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
@ -135,63 +184,75 @@ fpu_save:
###############################################################################
#
# void fpu_restore(struct fpu_state_struct *)
# - restore the fpu state
# - note that an FPU Operational exception might occur during this process
# void fpu_disabled(void)
# - handle an exception due to the FPU being disabled
# when CONFIG_FPU is enabled
#
###############################################################################
.globl fpu_restore
.type fpu_restore,@function
fpu_restore:
mov epsw,d1
or EPSW_FE,epsw /* enable the FPU so we can access it */
.type fpu_disabled,@function
.globl fpu_disabled
fpu_disabled:
or EPSW_nAR|EPSW_FE,epsw
nop
nop
nop
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
#endif
mov d0,a0
fmov (a0+),fs0
fmov (a0+),fs1
fmov (a0+),fs2
fmov (a0+),fs3
fmov (a0+),fs4
fmov (a0+),fs5
fmov (a0+),fs6
fmov (a0+),fs7
fmov (a0+),fs8
fmov (a0+),fs9
fmov (a0+),fs10
fmov (a0+),fs11
fmov (a0+),fs12
fmov (a0+),fs13
fmov (a0+),fs14
fmov (a0+),fs15
fmov (a0+),fs16
fmov (a0+),fs17
fmov (a0+),fs18
fmov (a0+),fs19
fmov (a0+),fs20
fmov (a0+),fs21
fmov (a0+),fs22
fmov (a0+),fs23
fmov (a0+),fs24
fmov (a0+),fs25
fmov (a0+),fs26
fmov (a0+),fs27
fmov (a0+),fs28
fmov (a0+),fs29
fmov (a0+),fs30
fmov (a0+),fs31
mov (a0),d0
fmov d0,fpcr
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
nop
#endif
mov sp,a1
mov (a1),d1 /* get epsw of user context */
and ~(THREAD_SIZE-1),a1 /* a1: (thread_info *ti) */
mov (TI_task,a1),a2 /* a2: (task_struct *tsk) */
btst EPSW_nSL,d1
beq fpu_used_in_kernel
mov d1,epsw
ret [],0
or EPSW_FE,d1
mov d1,(sp)
mov (TASK_THREAD+THREAD_FPU_FLAGS,a2),d1
#ifndef CONFIG_LAZY_SAVE_FPU
or __THREAD_HAS_FPU,d1
mov d1,(TASK_THREAD+THREAD_FPU_FLAGS,a2)
#else /* !CONFIG_LAZY_SAVE_FPU */
mov (fpu_state_owner),a0
cmp 0,a0
beq fpu_regs_save_end
.size fpu_restore,.-fpu_restore
mov (TASK_THREAD+THREAD_UREGS,a0),a1
add TASK_THREAD+THREAD_FPU_STATE,a0
FPU_SAVE_ALL a0,d0
mov (REG_EPSW,a1),d0
and ~EPSW_FE,d0
mov d0,(REG_EPSW,a1)
fpu_regs_save_end:
mov a2,(fpu_state_owner)
#endif /* !CONFIG_LAZY_SAVE_FPU */
btst __THREAD_USING_FPU,d1
beq fpu_regs_init
add TASK_THREAD+THREAD_FPU_STATE,a2
FPU_RESTORE_ALL a2,d0
rti
fpu_regs_init:
FPU_INIT_STATE_ALL
add TASK_THREAD+THREAD_FPU_FLAGS,a2
bset __THREAD_USING_FPU,(0,a2)
rti
fpu_used_in_kernel:
and ~(EPSW_nAR|EPSW_FE),epsw
nop
nop
add -4,sp
SAVE_ALL
mov -1,d0
mov d0,(REG_ORIG_D0,fp)
and ~EPSW_NMID,epsw
mov fp,d0
call fpu_disabled_in_kernel[],0
jmp ret_from_exception
.size fpu_disabled,.-fpu_disabled

39
arch/mn10300/kernel/fpu-nofpu-low.S Normal file
View File

@ -0,0 +1,39 @@
/* MN10300 Low level FPU management operations
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/linkage.h>
#include <asm/cpu-regs.h>
#include <asm/smp.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
#include <asm/frame.inc>
###############################################################################
#
# void fpu_disabled(void)
# - handle an exception due to the FPU being disabled
# when CONFIG_FPU is disabled
#
###############################################################################
.type fpu_disabled,@function
.globl fpu_disabled
fpu_disabled:
add -4,sp
SAVE_ALL
mov -1,d0
mov d0,(REG_ORIG_D0,fp)
and ~EPSW_NMID,epsw
mov fp,d0
call unexpected_fpu_exception[],0
jmp ret_from_exception
.size fpu_disabled,.-fpu_disabled

30
arch/mn10300/kernel/fpu-nofpu.c Normal file
View File

@ -0,0 +1,30 @@
/* MN10300 FPU management
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <asm/fpu.h>
/*
* handle an FPU operational exception
* - there's a possibility that if the FPU is asynchronous, the signal might
* be meant for a process other than the current one
*/
asmlinkage
void unexpected_fpu_exception(struct pt_regs *regs, enum exception_code code)
{
panic("An FPU exception was received, but there's no FPU enabled.");
}
/*
* fill in the FPU structure for a core dump
*/
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpreg)
{
return 0; /* not valid */
}

123
arch/mn10300/kernel/fpu.c
View File

@ -12,56 +12,19 @@
#include <asm/fpu.h>
#include <asm/elf.h>
#include <asm/exceptions.h>
#include <asm/system.h>
#ifdef CONFIG_LAZY_SAVE_FPU
struct task_struct *fpu_state_owner;
#endif
/*
* handle an exception due to the FPU being disabled
* error functions in FPU disabled exception
*/
asmlinkage void fpu_disabled(struct pt_regs *regs, enum exception_code code)
asmlinkage void fpu_disabled_in_kernel(struct pt_regs *regs)
{
struct task_struct *tsk = current;
if (!user_mode(regs))
die_if_no_fixup("An FPU Disabled exception happened in"
" kernel space\n",
regs, code);
#ifdef CONFIG_FPU
preempt_disable();
/* transfer the last process's FPU state to memory */
if (fpu_state_owner) {
fpu_save(&fpu_state_owner->thread.fpu_state);
fpu_state_owner->thread.uregs->epsw &= ~EPSW_FE;
}
/* the current process now owns the FPU state */
fpu_state_owner = tsk;
regs->epsw |= EPSW_FE;
/* load the FPU with the current process's FPU state or invent a new
* clean one if the process doesn't have one */
if (is_using_fpu(tsk)) {
fpu_restore(&tsk->thread.fpu_state);
} else {
fpu_init_state();
set_using_fpu(tsk);
}
preempt_enable();
#else
{
siginfo_t info;
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_addr = (void *) tsk->thread.uregs->pc;
info.si_code = FPE_FLTINV;
force_sig_info(SIGFPE, &info, tsk);
}
#endif /* CONFIG_FPU */
die_if_no_fixup("An FPU Disabled exception happened in kernel space\n",
regs, EXCEP_FPU_DISABLED);
}
/*
@ -71,15 +34,16 @@ asmlinkage void fpu_disabled(struct pt_regs *regs, enum exception_code code)
*/
asmlinkage void fpu_exception(struct pt_regs *regs, enum exception_code code)
{
struct task_struct *tsk = fpu_state_owner;
struct task_struct *tsk = current;
siginfo_t info;
u32 fpcr;
if (!user_mode(regs))
die_if_no_fixup("An FPU Operation exception happened in"
" kernel space\n",
regs, code);
if (!tsk)
if (!is_using_fpu(tsk))
die_if_no_fixup("An FPU Operation exception happened,"
" but the FPU is not in use",
regs, code);
@ -89,27 +53,9 @@ asmlinkage void fpu_exception(struct pt_regs *regs, enum exception_code code)
info.si_addr = (void *) tsk->thread.uregs->pc;
info.si_code = FPE_FLTINV;
#ifdef CONFIG_FPU
{
u32 fpcr;
unlazy_fpu(tsk);
/* get FPCR (we need to enable the FPU whilst we do this) */
asm volatile(" or %1,epsw \n"
#ifdef CONFIG_MN10300_PROC_MN103E010
" nop \n"
" nop \n"
" nop \n"
#endif
" fmov fpcr,%0 \n"
#ifdef CONFIG_MN10300_PROC_MN103E010
" nop \n"
" nop \n"
" nop \n"
#endif
" and %2,epsw \n"
: "=&d"(fpcr)
: "i"(EPSW_FE), "i"(~EPSW_FE)
);
fpcr = tsk->thread.fpu_state.fpcr;
if (fpcr & FPCR_EC_Z)
info.si_code = FPE_FLTDIV;
@ -119,18 +65,33 @@ asmlinkage void fpu_exception(struct pt_regs *regs, enum exception_code code)
info.si_code = FPE_FLTUND;
else if (fpcr & FPCR_EC_I)
info.si_code = FPE_FLTRES;
}
#endif
force_sig_info(SIGFPE, &info, tsk);
}
/*
* handle an FPU invalid_op exception
* - Derived from DO_EINFO() macro in arch/mn10300/kernel/traps.c
*/
asmlinkage void fpu_invalid_op(struct pt_regs *regs, enum exception_code code)
{
siginfo_t info;
if (!user_mode(regs))
die_if_no_fixup("FPU invalid opcode", regs, code);
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_COPROC;
info.si_addr = (void *) regs->pc;
force_sig_info(info.si_signo, &info, current);
}
/*
* save the FPU state to a signal context
*/
int fpu_setup_sigcontext(struct fpucontext *fpucontext)
{
#ifdef CONFIG_FPU
struct task_struct *tsk = current;
if (!is_using_fpu(tsk))
@ -142,11 +103,19 @@ int fpu_setup_sigcontext(struct fpucontext *fpucontext)
*/
preempt_disable();
#ifndef CONFIG_LAZY_SAVE_FPU
if (tsk->thread.fpu_flags & THREAD_HAS_FPU) {
fpu_save(&tsk->thread.fpu_state);
tsk->thread.uregs->epsw &= ~EPSW_FE;
tsk->thread.fpu_flags &= ~THREAD_HAS_FPU;
}
#else /* !CONFIG_LAZY_SAVE_FPU */
if (fpu_state_owner == tsk) {
fpu_save(&tsk->thread.fpu_state);
fpu_state_owner->thread.uregs->epsw &= ~EPSW_FE;
fpu_state_owner = NULL;
}
#endif /* !CONFIG_LAZY_SAVE_FPU */
preempt_enable();
@ -161,9 +130,6 @@ int fpu_setup_sigcontext(struct fpucontext *fpucontext)
return -1;
return 1;
#else
return 0;
#endif
}
/*
@ -171,17 +137,23 @@ int fpu_setup_sigcontext(struct fpucontext *fpucontext)
*/
void fpu_kill_state(struct task_struct *tsk)
{
#ifdef CONFIG_FPU
/* disown anything left in the FPU */
preempt_disable();
#ifndef CONFIG_LAZY_SAVE_FPU
if (tsk->thread.fpu_flags & THREAD_HAS_FPU) {
tsk->thread.uregs->epsw &= ~EPSW_FE;
tsk->thread.fpu_flags &= ~THREAD_HAS_FPU;
}
#else /* !CONFIG_LAZY_SAVE_FPU */
if (fpu_state_owner == tsk) {
fpu_state_owner->thread.uregs->epsw &= ~EPSW_FE;
fpu_state_owner = NULL;
}
#endif /* !CONFIG_LAZY_SAVE_FPU */
preempt_enable();
#endif
/* we no longer have a valid current FPU state */
clear_using_fpu(tsk);
}
@ -195,8 +167,7 @@ int fpu_restore_sigcontext(struct fpucontext *fpucontext)
int ret;
/* load up the old FPU state */
ret = copy_from_user(&tsk->thread.fpu_state,
fpucontext,
ret = copy_from_user(&tsk->thread.fpu_state, fpucontext,
min(sizeof(struct fpu_state_struct),
sizeof(struct fpucontext)));
if (!ret)

2
arch/mn10300/kernel/traps.c
View File

@ -101,7 +101,6 @@ DO_EINFO(SIGILL, {}, "invalid opcode", invalid_op, ILL_ILLOPC);
DO_EINFO(SIGILL, {}, "invalid ex opcode", invalid_exop, ILL_ILLOPC);
DO_EINFO(SIGBUS, {}, "invalid address", mem_error, BUS_ADRERR);
DO_EINFO(SIGBUS, {}, "bus error", bus_error, BUS_ADRERR);
DO_EINFO(SIGILL, {}, "FPU invalid opcode", fpu_invalid_op, ILL_COPROC);
DO_ERROR(SIGTRAP,
#ifndef CONFIG_MN10300_USING_JTAG
@ -561,7 +560,6 @@ void __init trap_init(void)
set_excp_vector(EXCEP_PRIVINSACC, insn_acc_error);
set_excp_vector(EXCEP_PRIVDATACC, data_acc_error);
set_excp_vector(EXCEP_DATINSACC, insn_acc_error);
set_excp_vector(EXCEP_FPU_DISABLED, fpu_disabled);
set_excp_vector(EXCEP_FPU_UNIMPINS, fpu_invalid_op);
set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception);

2
arch/mn10300/proc-mn103e010/proc-init.c
View File

@ -9,6 +9,7 @@
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <asm/fpu.h>
#include <asm/rtc.h>
/*
@ -28,6 +29,7 @@ asmlinkage void __init processor_init(void)
__set_intr_stub(EXCEP_DAERROR, dtlb_aerror);
__set_intr_stub(EXCEP_BUSERROR, raw_bus_error);
__set_intr_stub(EXCEP_DOUBLE_FAULT, double_fault);
__set_intr_stub(EXCEP_FPU_DISABLED, fpu_disabled);
__set_intr_stub(EXCEP_SYSCALL0, system_call);
__set_intr_stub(EXCEP_NMI, nmi_handler);