diff options
Diffstat (limited to 'arch/mn10300/kernel/fpu.c')
| -rw-r--r-- | arch/mn10300/kernel/fpu.c | 177 |
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; -} |