diff options
| author | Paul Burton <paul.burton@imgtec.com> | 2014-01-27 15:23:02 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-03-26 23:09:09 +0100 |
| commit | b2ead528288545859dbd7004e07bc23204cf92a8 (patch) | |
| tree | d01478041879e4d01aef8e1b544575428000caa5 /arch/mips/kernel/signal.c | |
| parent | e87ce9482287c396c0804e4ec3a3fc63b1ff7ac0 (diff) | |
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 <paul.burton@imgtec.com>
Reviewed-by: Qais Yousef <qais.yousef@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6422/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/signal.c')
| -rw-r--r-- | arch/mips/kernel/signal.c | 45 |
1 files changed, 38 insertions, 7 deletions
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 */ @@ -64,6 +61,40 @@ struct rt_sigframe { }; /* + * 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 */ static int protected_save_fp_context(struct sigcontext __user *sc) @@ -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 |