From b2ead528288545859dbd7004e07bc23204cf92a8 Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Mon, 27 Jan 2014 15:23:02 +0000 Subject: MIPS: Move & rename fpu_emulator_{save,restore}_context These functions aren't directly related to the FPU emulator at all, they simply copy between a thread's saved context & a sigcontext. Thus move them to the appropriate signal files & rename them accordingly. This makes it clearer that the functions don't require the FPU emulator in any way. Signed-off-by: Paul Burton Reviewed-by: Qais Yousef Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6422/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/signal.c | 45 ++++++++++++++++++++++++++++++++++++++------- 1 file changed, 38 insertions(+), 7 deletions(-) (limited to 'arch/mips/kernel/signal.c') diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index 5199563c4403..b7e4614d41b5 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -46,9 +46,6 @@ static int (*restore_fp_context)(struct sigcontext __user *sc); extern asmlinkage int _save_fp_context(struct sigcontext __user *sc); extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc); -extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc); -extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc); - struct sigframe { u32 sf_ass[4]; /* argument save space for o32 */ u32 sf_pad[2]; /* Was: signal trampoline */ @@ -63,6 +60,40 @@ struct rt_sigframe { struct ucontext rs_uc; }; +/* + * Thread saved context copy to/from a signal context presumed to be on the + * user stack, and therefore accessed with appropriate macros from uaccess.h. + */ +static int copy_fp_to_sigcontext(struct sigcontext __user *sc) +{ + int i; + int err = 0; + + for (i = 0; i < 32; i++) { + err |= + __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0), + &sc->sc_fpregs[i]); + } + err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); + + return err; +} + +static int copy_fp_from_sigcontext(struct sigcontext __user *sc) +{ + int i; + int err = 0; + u64 fpr_val; + + for (i = 0; i < 32; i++) { + err |= __get_user(fpr_val, &sc->sc_fpregs[i]); + set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val); + } + err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); + + return err; +} + /* * Helper routines */ @@ -595,14 +626,14 @@ static int smp_save_fp_context(struct sigcontext __user *sc) { return raw_cpu_has_fpu ? _save_fp_context(sc) - : fpu_emulator_save_context(sc); + : copy_fp_to_sigcontext(sc); } static int smp_restore_fp_context(struct sigcontext __user *sc) { return raw_cpu_has_fpu ? _restore_fp_context(sc) - : fpu_emulator_restore_context(sc); + : copy_fp_from_sigcontext(sc); } #endif @@ -617,8 +648,8 @@ static int signal_setup(void) save_fp_context = _save_fp_context; restore_fp_context = _restore_fp_context; } else { - save_fp_context = fpu_emulator_save_context; - restore_fp_context = fpu_emulator_restore_context; + save_fp_context = copy_fp_from_sigcontext; + restore_fp_context = copy_fp_to_sigcontext; } #endif -- cgit v1.2.3