forked from Minki/linux
208 lines
6.1 KiB
C
208 lines
6.1 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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#include <linux/config.h>
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static inline int
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setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *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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#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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#ifdef CONFIG_32BIT
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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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if (cpu_has_dsp) {
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err |= __put_user(mfhi1(), &sc->sc_hi1);
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err |= __put_user(mflo1(), &sc->sc_lo1);
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err |= __put_user(mfhi2(), &sc->sc_hi2);
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err |= __put_user(mflo2(), &sc->sc_lo2);
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err |= __put_user(mfhi3(), &sc->sc_hi3);
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err |= __put_user(mflo3(), &sc->sc_lo3);
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err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
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}
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#endif
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#ifdef CONFIG_64BIT
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err |= __put_user(regs->hi, &sc->sc_hi[0]);
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err |= __put_user(regs->lo, &sc->sc_lo[0]);
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if (cpu_has_dsp) {
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err |= __put_user(mfhi1(), &sc->sc_hi[1]);
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err |= __put_user(mflo1(), &sc->sc_lo[1]);
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err |= __put_user(mfhi2(), &sc->sc_hi[2]);
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err |= __put_user(mflo2(), &sc->sc_lo[2]);
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err |= __put_user(mfhi3(), &sc->sc_hi[3]);
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err |= __put_user(mflo3(), &sc->sc_lo[3]);
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err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
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}
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#endif
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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 __user *sc)
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{
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unsigned int used_math;
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unsigned long treg;
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int err = 0;
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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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#ifdef CONFIG_32BIT
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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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if (cpu_has_dsp) {
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err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
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err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
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err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
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err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
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err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
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err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
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err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
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}
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#endif
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#ifdef CONFIG_64BIT
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err |= __get_user(regs->hi, &sc->sc_hi[0]);
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err |= __get_user(regs->lo, &sc->sc_lo[0]);
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if (cpu_has_dsp) {
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err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg);
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err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg);
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err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg);
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err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg);
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err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg);
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err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg);
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err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
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}
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#endif
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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 __user *
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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;
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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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return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
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}
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static inline int install_sigtramp(unsigned int __user *tramp,
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unsigned int syscall)
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{
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int err;
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/*
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* Set up the return code ...
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*
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* li v0, __NR__foo_sigreturn
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* syscall
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*/
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err = __put_user(0x24020000 + syscall, tramp + 0);
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err |= __put_user(0x0000000c , tramp + 1);
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if (ICACHE_REFILLS_WORKAROUND_WAR) {
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err |= __put_user(0, tramp + 2);
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err |= __put_user(0, tramp + 3);
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err |= __put_user(0, tramp + 4);
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err |= __put_user(0, tramp + 5);
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err |= __put_user(0, tramp + 6);
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err |= __put_user(0, tramp + 7);
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}
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flush_cache_sigtramp((unsigned long) tramp);
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return err;
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}
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