You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
137 lines
3.9 KiB
137 lines
3.9 KiB
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright (C) 1994 - 2000 Ralf Baechle
|
|
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
|
|
*/
|
|
|
|
static inline int
|
|
setup_sigcontext(struct pt_regs *regs, struct sigcontext *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) do { \
|
|
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);
|
|
err |= __put_user(regs->cp0_cause, &sc->sc_cause);
|
|
err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr);
|
|
|
|
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_context(sc);
|
|
|
|
preempt_enable();
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static inline int
|
|
restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
|
|
{
|
|
int err = 0;
|
|
unsigned int used_math;
|
|
|
|
/* Always make any pending restarted system calls return -EINTR */
|
|
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
|
|
|
err |= __get_user(regs->cp0_epc, &sc->sc_pc);
|
|
err |= __get_user(regs->hi, &sc->sc_mdhi);
|
|
err |= __get_user(regs->lo, &sc->sc_mdlo);
|
|
|
|
#define restore_gp_reg(i) do { \
|
|
err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \
|
|
} while(0)
|
|
restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
|
|
restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
|
|
restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
|
|
restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
|
|
restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
|
|
restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
|
|
restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
|
|
restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
|
|
restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
|
|
restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
|
|
restore_gp_reg(31);
|
|
#undef restore_gp_reg
|
|
|
|
err |= __get_user(used_math, &sc->sc_used_math);
|
|
conditional_used_math(used_math);
|
|
|
|
preempt_disable();
|
|
|
|
if (used_math()) {
|
|
/* restore fpu context if we have used it before */
|
|
own_fpu();
|
|
err |= restore_fp_context(sc);
|
|
} else {
|
|
/* signal handler may have used FPU. Give it up. */
|
|
lose_fpu();
|
|
}
|
|
|
|
preempt_enable();
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Determine which stack to use..
|
|
*/
|
|
static inline void *
|
|
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
|
|
{
|
|
unsigned long sp, almask;
|
|
|
|
/* Default to using normal stack */
|
|
sp = regs->regs[29];
|
|
|
|
/*
|
|
* FPU emulator may have it's own trampoline active just
|
|
* above the user stack, 16-bytes before the next lowest
|
|
* 16 byte boundary. Try to avoid trashing it.
|
|
*/
|
|
sp -= 32;
|
|
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
|
if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
|
|
sp = current->sas_ss_sp + current->sas_ss_size;
|
|
|
|
if (PLAT_TRAMPOLINE_STUFF_LINE)
|
|
almask = ~(PLAT_TRAMPOLINE_STUFF_LINE - 1);
|
|
else
|
|
almask = ALMASK;
|
|
|
|
return (void *)((sp - frame_size) & almask);
|
|
}
|
|
|