138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1994 - 2000 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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static inline int
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setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
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{
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int err = 0;
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err |= __put_user(regs->cp0_epc, &sc->sc_pc);
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err |= __put_user(regs->cp0_status, &sc->sc_status);
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#define save_gp_reg(i) do { \
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err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \
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} while(0)
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__put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
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save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
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save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
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save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
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save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
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save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
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save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
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save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
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save_gp_reg(31);
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#undef save_gp_reg
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err |= __put_user(regs->hi, &sc->sc_mdhi);
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err |= __put_user(regs->lo, &sc->sc_mdlo);
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err |= __put_user(regs->cp0_cause, &sc->sc_cause);
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err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr);
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err |= __put_user(!!used_math(), &sc->sc_used_math);
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if (!used_math())
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goto out;
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/*
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* Save FPU state to signal context. Signal handler will "inherit"
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* current FPU state.
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*/
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preempt_disable();
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if (!is_fpu_owner()) {
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own_fpu();
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restore_fp(current);
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}
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err |= save_fp_context(sc);
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preempt_enable();
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out:
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return err;
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}
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static inline int
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restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
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{
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int err = 0;
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unsigned int used_math;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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err |= __get_user(regs->cp0_epc, &sc->sc_pc);
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err |= __get_user(regs->hi, &sc->sc_mdhi);
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err |= __get_user(regs->lo, &sc->sc_mdlo);
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#define restore_gp_reg(i) do { \
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err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \
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} while(0)
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restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
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restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
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restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
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restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
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restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
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restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
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restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
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restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
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restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
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restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
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restore_gp_reg(31);
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#undef restore_gp_reg
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err |= __get_user(used_math, &sc->sc_used_math);
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conditional_used_math(used_math);
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preempt_disable();
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if (used_math()) {
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/* restore fpu context if we have used it before */
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own_fpu();
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err |= restore_fp_context(sc);
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} else {
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/* signal handler may have used FPU. Give it up. */
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lose_fpu();
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}
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preempt_enable();
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return err;
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}
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/*
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* Determine which stack to use..
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*/
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static inline void *
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get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
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{
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unsigned long sp, almask;
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/* Default to using normal stack */
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sp = regs->regs[29];
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/*
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* FPU emulator may have it's own trampoline active just
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* above the user stack, 16-bytes before the next lowest
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* 16 byte boundary. Try to avoid trashing it.
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*/
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sp -= 32;
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/* This is the X/Open sanctioned signal stack switching. */
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if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
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sp = current->sas_ss_sp + current->sas_ss_size;
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if (PLAT_TRAMPOLINE_STUFF_LINE)
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almask = ~(PLAT_TRAMPOLINE_STUFF_LINE - 1);
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else
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almask = ALMASK;
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return (void *)((sp - frame_size) & almask);
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}
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