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authorPaul Burton <paul.burton@imgtec.com>2014-01-27 15:23:02 +0000
committerRalf Baechle <ralf@linux-mips.org>2014-03-26 23:09:09 +0100
commitb2ead528288545859dbd7004e07bc23204cf92a8 (patch)
treed01478041879e4d01aef8e1b544575428000caa5 /arch/mips/kernel/signal.c
parente87ce9482287c396c0804e4ec3a3fc63b1ff7ac0 (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.c45
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(&current->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(&current->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