/*
* sigcontext handlers
*/
static int protected_save_fp_context32(struct sigcontext32 __user *sc,
unsigned used_math)
{
int err;
bool save_msa = cpu_has_msa && (used_math & USEDMATH_MSA);
while (1) {
lock_fpu_owner();
if (is_fpu_owner()) {
err = save_fp_context32(sc);
if (save_msa && !err)
err = _save_msa_context32(sc);
unlock_fpu_owner();
} else {
unlock_fpu_owner();
err = copy_fp_to_sigcontext32(sc);
if (save_msa && !err)
err = copy_msa_to_sigcontext32(sc);
}
if (likely(!err))
break;
/* touch the sigcontext and try again */
err = __put_user(0, &sc->sc_fpregs[0]) |
__put_user(0, &sc->sc_fpregs[31]) |
__put_user(0, &sc->sc_fpc_csr);
if (err)
break; /* really bad sigcontext */
}
return err;
}
static inline int setup_sigcontext32(struct pt_regs *regs,
struct sigcontext32 __user *sc)
{
int err = 0;
err |= __put_user(regs->cp0_epc, &sc->sc_pc);
err |= __put_user(regs->cp0_status, &sc->sc_status);
#define save_gp_reg(i) { \
err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \
} while(0)
__put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
save_gp_reg(31);
#undef save_gp_reg
err |= __put_user(regs->hi, &sc->sc_mdhi);
err |= __put_user(regs->lo, &sc->sc_mdlo);
if (cpu_has_dsp) {
err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
err |= __put_user(mfhi1(), &sc->sc_hi1);
err |= __put_user(mflo1(), &sc->sc_lo1);
err |= __put_user(mfhi2(), &sc->sc_hi2);
err |= __put_user(mflo2(), &sc->sc_lo2);
err |= __put_user(mfhi3(), &sc->sc_hi3);
err |= __put_user(mflo3(), &sc->sc_lo3);
}
err |= __put_user(!!used_math(), &sc->sc_used_math);
if (!used_math())
goto out;
/*
* Save FPU state to signal context. Signal handler will "inherit"
* current FPU state.
*/
preempt_disable();
if (!is_fpu_owner()) {
own_fpu();
restore_fp(current);
}
err |= save_fp_context32(sc);
preempt_enable();
out:
return err;
}
/*
* sigcontext handlers
*/
static int protected_save_fp_context32(struct sigcontext32 __user *sc)
{
int err;
while (1) {
lock_fpu_owner();
own_fpu_inatomic(1);
err = save_fp_context32(sc); /* this might fail */
unlock_fpu_owner();
if (likely(!err))
break;
/* touch the sigcontext and try again */
err = __put_user(0, &sc->sc_fpregs[0]) |
__put_user(0, &sc->sc_fpregs[31]) |
__put_user(0, &sc->sc_fpc_csr);
if (err)
break; /* really bad sigcontext */
}
return err;
}
/*
* sigcontext handlers
*/
static int protected_save_fp_context32(struct sigcontext32 __user *sc)
{
int err;
while (1) {
lock_fpu_owner();
if (is_fpu_owner()) {
err = save_fp_context32(sc);
unlock_fpu_owner();
} else {
unlock_fpu_owner();
err = copy_fp_to_sigcontext32(sc);
}
if (likely(!err))
break;
/* touch the sigcontext and try again */
err = __put_user(0, &sc->sc_fpregs[0]) |
__put_user(0, &sc->sc_fpregs[31]) |
__put_user(0, &sc->sc_fpc_csr);
if (err)
break; /* really bad sigcontext */
}
return err;
}