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Diffstat (limited to 'arch/mn10300/kernel/fpu.c')
-rw-r--r--arch/mn10300/kernel/fpu.c177
1 files changed, 0 insertions, 177 deletions
diff --git a/arch/mn10300/kernel/fpu.c b/arch/mn10300/kernel/fpu.c
deleted file mode 100644
index 50ce7b447fed..000000000000
--- a/arch/mn10300/kernel/fpu.c
+++ /dev/null
@@ -1,177 +0,0 @@
-/* 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 <linux/uaccess.h>
-#include <linux/sched/signal.h>
-
-#include <asm/fpu.h>
-#include <asm/elf.h>
-#include <asm/exceptions.h>
-
-#ifdef CONFIG_LAZY_SAVE_FPU
-struct task_struct *fpu_state_owner;
-#endif
-
-/*
- * error functions in FPU disabled exception
- */
-asmlinkage void fpu_disabled_in_kernel(struct pt_regs *regs)
-{
- die_if_no_fixup("An FPU Disabled exception happened in kernel space\n",
- regs, EXCEP_FPU_DISABLED);
-}
-
-/*
- * 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 fpu_exception(struct pt_regs *regs, enum exception_code code)
-{
- 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 (!is_using_fpu(tsk))
- die_if_no_fixup("An FPU Operation exception happened,"
- " but the FPU is not in use",
- regs, code);
-
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_addr = (void *) tsk->thread.uregs->pc;
- info.si_code = FPE_FLTINV;
-
- unlazy_fpu(tsk);
-
- fpcr = tsk->thread.fpu_state.fpcr;
-
- if (fpcr & FPCR_EC_Z)
- info.si_code = FPE_FLTDIV;
- else if (fpcr & FPCR_EC_O)
- info.si_code = FPE_FLTOVF;
- else if (fpcr & FPCR_EC_U)
- info.si_code = FPE_FLTUND;
- else if (fpcr & FPCR_EC_I)
- info.si_code = FPE_FLTRES;
-
- force_sig_info(SIGFPE, &info, tsk);
-}
-
-/*
- * save the FPU state to a signal context
- */
-int fpu_setup_sigcontext(struct fpucontext *fpucontext)
-{
- struct task_struct *tsk = current;
-
- if (!is_using_fpu(tsk))
- return 0;
-
- /* transfer the current FPU state to memory and cause fpu_init() to be
- * triggered by the next attempted FPU operation by the current
- * process.
- */
- 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();
-
- /* we no longer have a valid current FPU state */
- clear_using_fpu(tsk);
-
- /* transfer the saved FPU state onto the userspace stack */
- if (copy_to_user(fpucontext,
- &tsk->thread.fpu_state,
- min(sizeof(struct fpu_state_struct),
- sizeof(struct fpucontext))))
- return -1;
-
- return 1;
-}
-
-/*
- * kill a process's FPU state during restoration after signal handling
- */
-void fpu_kill_state(struct task_struct *tsk)
-{
- /* 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();
-
- /* we no longer have a valid current FPU state */
- clear_using_fpu(tsk);
-}
-
-/*
- * restore the FPU state from a signal context
- */
-int fpu_restore_sigcontext(struct fpucontext *fpucontext)
-{
- struct task_struct *tsk = current;
- int ret;
-
- /* load up the old FPU state */
- ret = copy_from_user(&tsk->thread.fpu_state, fpucontext,
- min(sizeof(struct fpu_state_struct),
- sizeof(struct fpucontext)));
- if (!ret)
- set_using_fpu(tsk);
-
- return ret;
-}
-
-/*
- * fill in the FPU structure for a core dump
- */
-int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpreg)
-{
- struct task_struct *tsk = current;
- int fpvalid;
-
- fpvalid = is_using_fpu(tsk);
- if (fpvalid) {
- unlazy_fpu(tsk);
- memcpy(fpreg, &tsk->thread.fpu_state, sizeof(*fpreg));
- }
-
- return fpvalid;
-}