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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>
This commit is contained in:
Paul Burton 2014-01-27 15:23:02 +00:00 committed by Ralf Baechle
parent e87ce94822
commit b2ead52828
3 changed files with 76 additions and 87 deletions
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45
arch/mips/kernel/signal.c
View File

@ -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(&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
*/
@ -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

43
arch/mips/kernel/signal32.c
View File

@ -42,9 +42,6 @@ static int (*restore_fp_context32)(struct sigcontext32 __user *sc);
extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc);
extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc);
extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc);
extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc);
/*
* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
*/
@ -77,6 +74,42 @@ struct rt_sigframe32 {
struct ucontext32 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_sigcontext32(struct sigcontext32 __user *sc)
{
int i;
int err = 0;
int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
for (i = 0; i < 32; i += inc) {
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_sigcontext32(struct sigcontext32 __user *sc)
{
int i;
int err = 0;
int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
u64 fpr_val;
for (i = 0; i < 32; i += inc) {
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;
}
/*
* sigcontext handlers
*/
@ -566,8 +599,8 @@ static int signal32_init(void)
save_fp_context32 = _save_fp_context32;
restore_fp_context32 = _restore_fp_context32;
} else {
save_fp_context32 = fpu_emulator_save_context32;
restore_fp_context32 = fpu_emulator_restore_context32;
save_fp_context32 = copy_fp_to_sigcontext32;
restore_fp_context32 = copy_fp_from_sigcontext32;
}
return 0;

75
arch/mips/math-emu/kernel_linkage.c
View File

@ -43,78 +43,3 @@ void fpu_emulator_init_fpu(void)
for (i = 0; i < 32; i++)
set_fpr64(&current->thread.fpu.fpr[i], 0, SIGNALLING_NAN);
}
/*
* Emulator context save/restore to/from a signal context
* presumed to be on the user stack, and therefore accessed
* with appropriate macros from uaccess.h
*/
int fpu_emulator_save_context(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;
}
int fpu_emulator_restore_context(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;
}
#ifdef CONFIG_64BIT
/*
* This is the o32 version
*/
int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
{
int i;
int err = 0;
int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
for (i = 0; i < 32; i += inc) {
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;
}
int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
{
int i;
int err = 0;
int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
u64 fpr_val;
for (i = 0; i < 32; i += inc) {
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;
}
#endif