Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 962 insertions, 0 deletions

diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
new file mode 100644
index 000000000..f1e985109
--- /dev/null
+++ b/arch/mips/kernel/signal.c
@@ -0,0 +1,962 @@
+/*
+ * 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.
+ * Copyright (C) 2014, Imagination Technologies Ltd.
+ */
+#include <linux/cache.h>
+#include <linux/context_tracking.h>
+#include <linux/irqflags.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/personality.h>
+#include <linux/smp.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/uprobes.h>
+#include <linux/compiler.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+#include <linux/tracehook.h>
+
+#include <asm/abi.h>
+#include <asm/asm.h>
+#include <linux/bitops.h>
+#include <asm/cacheflush.h>
+#include <asm/fpu.h>
+#include <asm/sim.h>
+#include <asm/ucontext.h>
+#include <asm/cpu-features.h>
+#include <asm/war.h>
+#include <asm/dsp.h>
+#include <asm/inst.h>
+#include <asm/msa.h>
+
+#include "signal-common.h"
+
+static int (*save_fp_context)(void __user *sc);
+static int (*restore_fp_context)(void __user *sc);
+
+struct sigframe {
+        u32 sf_ass[4];          /* argument save space for o32 */
+        u32 sf_pad[2];          /* Was: signal trampoline */
+
+        /* Matches struct ucontext from its uc_mcontext field onwards */
+        struct sigcontext sf_sc;
+        sigset_t sf_mask;
+        unsigned long long sf_extcontext[];
+};
+
+struct rt_sigframe {
+        u32 rs_ass[4];          /* argument save space for o32 */
+        u32 rs_pad[2];          /* Was: signal trampoline */
+        struct siginfo rs_info;
+        struct ucontext rs_uc;
+};
+
+#ifdef CONFIG_MIPS_FP_SUPPORT
+
+/*
+ * 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(void __user *sc)
+{
+        struct mips_abi *abi = current->thread.abi;
+        uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
+        uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
+        int i;
+        int err = 0;
+        int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
+
+        for (i = 0; i < NUM_FPU_REGS; i += inc) {
+                err |=
+                    __put_user(get_fpr64(&current->thread.fpu.fpr[i], 0),
+                               &fpregs[i]);
+        }
+        err |= __put_user(current->thread.fpu.fcr31, csr);
+
+        return err;
+}
+
+static int copy_fp_from_sigcontext(void __user *sc)
+{
+        struct mips_abi *abi = current->thread.abi;
+        uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
+        uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
+        int i;
+        int err = 0;
+        int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
+        u64 fpr_val;
+
+        for (i = 0; i < NUM_FPU_REGS; i += inc) {
+                err |= __get_user(fpr_val, &fpregs[i]);
+                set_fpr64(&current->thread.fpu.fpr[i], 0, fpr_val);
+        }
+        err |= __get_user(current->thread.fpu.fcr31, csr);
+
+        return err;
+}
+
+#else /* !CONFIG_MIPS_FP_SUPPORT */
+
+static int copy_fp_to_sigcontext(void __user *sc)
+{
+        return 0;
+}
+
+static int copy_fp_from_sigcontext(void __user *sc)
+{
+        return 0;
+}
+
+#endif /* !CONFIG_MIPS_FP_SUPPORT */
+
+/*
+ * Wrappers for the assembly _{save,restore}_fp_context functions.
+ */
+static int save_hw_fp_context(void __user *sc)
+{
+        struct mips_abi *abi = current->thread.abi;
+        uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
+        uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
+
+        return _save_fp_context(fpregs, csr);
+}
+
+static int restore_hw_fp_context(void __user *sc)
+{
+        struct mips_abi *abi = current->thread.abi;
+        uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
+        uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
+
+        return _restore_fp_context(fpregs, csr);
+}
+
+/*
+ * Extended context handling.
+ */
+
+static inline void __user *sc_to_extcontext(void __user *sc)
+{
+        struct ucontext __user *uc;
+
+        /*
+         * We can just pretend the sigcontext is always embedded in a struct
+         * ucontext here, because the offset from sigcontext to extended
+         * context is the same in the struct sigframe case.
+         */
+        uc = container_of(sc, struct ucontext, uc_mcontext);
+        return &uc->uc_extcontext;
+}
+
+#ifdef CONFIG_CPU_HAS_MSA
+
+static int save_msa_extcontext(void __user *buf)
+{
+        struct msa_extcontext __user *msa = buf;
+        uint64_t val;
+        int i, err;
+
+        if (!thread_msa_context_live())
+                return 0;
+
+        /*
+         * Ensure that we can't lose the live MSA context between checking
+         * for it & writing it to memory.
+         */
+        preempt_disable();
+
+        if (is_msa_enabled()) {
+                /*
+                 * There are no EVA versions of the vector register load/store
+                 * instructions, so MSA context has to be saved to kernel memory
+                 * and then copied to user memory. The save to kernel memory
+                 * should already have been done when handling scalar FP
+                 * context.
+                 */
+                BUG_ON(IS_ENABLED(CONFIG_EVA));
+
+                err = __put_user(read_msa_csr(), &msa->csr);
+                err |= _save_msa_all_upper(&msa->wr);
+
+                preempt_enable();
+        } else {
+                preempt_enable();
+
+                err = __put_user(current->thread.fpu.msacsr, &msa->csr);
+
+                for (i = 0; i < NUM_FPU_REGS; i++) {
+                        val = get_fpr64(&current->thread.fpu.fpr[i], 1);
+                        err |= __put_user(val, &msa->wr[i]);
+                }
+        }
+
+        err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic);
+        err |= __put_user(sizeof(*msa), &msa->ext.size);
+
+        return err ? -EFAULT : sizeof(*msa);
+}
+
+static int restore_msa_extcontext(void __user *buf, unsigned int size)
+{
+        struct msa_extcontext __user *msa = buf;
+        unsigned long long val;
+        unsigned int csr;
+        int i, err;
+
+        if (size != sizeof(*msa))
+                return -EINVAL;
+
+        err = get_user(csr, &msa->csr);
+        if (err)
+                return err;
+
+        preempt_disable();
+
+        if (is_msa_enabled()) {
+                /*
+                 * There are no EVA versions of the vector register load/store
+                 * instructions, so MSA context has to be copied to kernel
+                 * memory and later loaded to registers. The same is true of
+                 * scalar FP context, so FPU & MSA should have already been
+                 * disabled whilst handling scalar FP context.
+                 */
+                BUG_ON(IS_ENABLED(CONFIG_EVA));
+
+                write_msa_csr(csr);
+                err |= _restore_msa_all_upper(&msa->wr);
+                preempt_enable();
+        } else {
+                preempt_enable();
+
+                current->thread.fpu.msacsr = csr;
+
+                for (i = 0; i < NUM_FPU_REGS; i++) {
+                        err |= __get_user(val, &msa->wr[i]);
+                        set_fpr64(&current->thread.fpu.fpr[i], 1, val);
+                }
+        }
+
+        return err;
+}
+
+#else /* !CONFIG_CPU_HAS_MSA */
+
+static int save_msa_extcontext(void __user *buf)
+{
+        return 0;
+}
+
+static int restore_msa_extcontext(void __user *buf, unsigned int size)
+{
+        return SIGSYS;
+}
+
+#endif /* !CONFIG_CPU_HAS_MSA */
+
+static int save_extcontext(void __user *buf)
+{
+        int sz;
+
+        sz = save_msa_extcontext(buf);
+        if (sz < 0)
+                return sz;
+        buf += sz;
+
+        /* If no context was saved then trivially return */
+        if (!sz)
+                return 0;
+
+        /* Write the end marker */
+        if (__put_user(END_EXTCONTEXT_MAGIC, (u32 *)buf))
+                return -EFAULT;
+
+        sz += sizeof(((struct extcontext *)NULL)->magic);
+        return sz;
+}
+
+static int restore_extcontext(void __user *buf)
+{
+        struct extcontext ext;
+        int err;
+
+        while (1) {
+                err = __get_user(ext.magic, (unsigned int *)buf);
+                if (err)
+                        return err;
+
+                if (ext.magic == END_EXTCONTEXT_MAGIC)
+                        return 0;
+
+                err = __get_user(ext.size, (unsigned int *)(buf
+                        + offsetof(struct extcontext, size)));
+                if (err)
+                        return err;
+
+                switch (ext.magic) {
+                case MSA_EXTCONTEXT_MAGIC:
+                        err = restore_msa_extcontext(buf, ext.size);
+                        break;
+
+                default:
+                        err = -EINVAL;
+                        break;
+                }
+
+                if (err)
+                        return err;
+
+                buf += ext.size;
+        }
+}
+
+/*
+ * Helper routines
+ */
+int protected_save_fp_context(void __user *sc)
+{
+        struct mips_abi *abi = current->thread.abi;
+        uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
+        uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
+        uint32_t __user *used_math = sc + abi->off_sc_used_math;
+        unsigned int used, ext_sz;
+        int err;
+
+        used = used_math() ? USED_FP : 0;
+        if (!used)
+                goto fp_done;
+
+        if (!test_thread_flag(TIF_32BIT_FPREGS))
+                used |= USED_FR1;
+        if (test_thread_flag(TIF_HYBRID_FPREGS))
+                used |= USED_HYBRID_FPRS;
+
+        /*
+         * EVA does not have userland equivalents of ldc1 or sdc1, so
+         * save to the kernel FP context & copy that to userland below.
+         */
+        if (IS_ENABLED(CONFIG_EVA))
+                lose_fpu(1);
+
+        while (1) {
+                lock_fpu_owner();
+                if (is_fpu_owner()) {
+                        err = save_fp_context(sc);
+                        unlock_fpu_owner();
+                } else {
+                        unlock_fpu_owner();
+                        err = copy_fp_to_sigcontext(sc);
+                }
+                if (likely(!err))
+                        break;
+                /* touch the sigcontext and try again */
+                err = __put_user(0, &fpregs[0]) |
+                        __put_user(0, &fpregs[31]) |
+                        __put_user(0, csr);
+                if (err)
+                        return err;     /* really bad sigcontext */
+        }
+
+fp_done:
+        ext_sz = err = save_extcontext(sc_to_extcontext(sc));
+        if (err < 0)
+                return err;
+        used |= ext_sz ? USED_EXTCONTEXT : 0;
+
+        return __put_user(used, used_math);
+}
+
+int protected_restore_fp_context(void __user *sc)
+{
+        struct mips_abi *abi = current->thread.abi;
+        uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
+        uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
+        uint32_t __user *used_math = sc + abi->off_sc_used_math;
+        unsigned int used;
+        int err, sig = 0, tmp __maybe_unused;
+
+        err = __get_user(used, used_math);
+        conditional_used_math(used & USED_FP);
+
+        /*
+         * The signal handler may have used FPU; give it up if the program
+         * doesn't want it following sigreturn.
+         */
+        if (err || !(used & USED_FP))
+                lose_fpu(0);
+        if (err)
+                return err;
+        if (!(used & USED_FP))
+                goto fp_done;
+
+        err = sig = fpcsr_pending(csr);
+        if (err < 0)
+                return err;
+
+        /*
+         * EVA does not have userland equivalents of ldc1 or sdc1, so we
+         * disable the FPU here such that the code below simply copies to
+         * the kernel FP context.
+         */
+        if (IS_ENABLED(CONFIG_EVA))
+                lose_fpu(0);
+
+        while (1) {
+                lock_fpu_owner();
+                if (is_fpu_owner()) {
+                        err = restore_fp_context(sc);
+                        unlock_fpu_owner();
+                } else {
+                        unlock_fpu_owner();
+                        err = copy_fp_from_sigcontext(sc);
+                }
+                if (likely(!err))
+                        break;
+                /* touch the sigcontext and try again */
+                err = __get_user(tmp, &fpregs[0]) |
+                        __get_user(tmp, &fpregs[31]) |
+                        __get_user(tmp, csr);
+                if (err)
+                        break;  /* really bad sigcontext */
+        }
+
+fp_done:
+        if (!err && (used & USED_EXTCONTEXT))
+                err = restore_extcontext(sc_to_extcontext(sc));
+
+        return err ?: sig;
+}
+
+int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+        int err = 0;
+        int i;
+
+        err |= __put_user(regs->cp0_epc, &sc->sc_pc);
+
+        err |= __put_user(0, &sc->sc_regs[0]);
+        for (i = 1; i < 32; i++)
+                err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
+
+#ifdef CONFIG_CPU_HAS_SMARTMIPS
+        err |= __put_user(regs->acx, &sc->sc_acx);
+#endif
+        err |= __put_user(regs->hi, &sc->sc_mdhi);
+        err |= __put_user(regs->lo, &sc->sc_mdlo);
+        if (cpu_has_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(rddsp(DSP_MASK), &sc->sc_dsp);
+        }
+
+
+        /*
+         * Save FPU state to signal context. Signal handler
+         * will "inherit" current FPU state.
+         */
+        err |= protected_save_fp_context(sc);
+
+        return err;
+}
+
+static size_t extcontext_max_size(void)
+{
+        size_t sz = 0;
+
+        /*
+         * The assumption here is that between this point & the point at which
+         * the extended context is saved the size of the context should only
+         * ever be able to shrink (if the task is preempted), but never grow.
+         * That is, what this function returns is an upper bound on the size of
+         * the extended context for the current task at the current time.
+         */
+
+        if (thread_msa_context_live())
+                sz += sizeof(struct msa_extcontext);
+
+        /* If any context is saved then we'll append the end marker */
+        if (sz)
+                sz += sizeof(((struct extcontext *)NULL)->magic);
+
+        return sz;
+}
+
+int fpcsr_pending(unsigned int __user *fpcsr)
+{
+        int err, sig = 0;
+        unsigned int csr, enabled;
+
+        err = __get_user(csr, fpcsr);
+        enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5);
+        /*
+         * If the signal handler set some FPU exceptions, clear it and
+         * send SIGFPE.
+         */
+        if (csr & enabled) {
+                csr &= ~enabled;
+                err |= __put_user(csr, fpcsr);
+                sig = SIGFPE;
+        }
+        return err ?: sig;
+}
+
+int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+        unsigned long treg;
+        int err = 0;
+        int i;
+
+        /* Always make any pending restarted system calls return -EINTR */
+        current->restart_block.fn = do_no_restart_syscall;
+
+        err |= __get_user(regs->cp0_epc, &sc->sc_pc);
+
+#ifdef CONFIG_CPU_HAS_SMARTMIPS
+        err |= __get_user(regs->acx, &sc->sc_acx);
+#endif
+        err |= __get_user(regs->hi, &sc->sc_mdhi);
+        err |= __get_user(regs->lo, &sc->sc_mdlo);
+        if (cpu_has_dsp) {
+                err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
+                err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
+                err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
+                err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
+                err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
+                err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
+                err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
+        }
+
+        for (i = 1; i < 32; i++)
+                err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
+
+        return err ?: protected_restore_fp_context(sc);
+}
+
+#ifdef CONFIG_WAR_ICACHE_REFILLS
+#define SIGMASK         ~(cpu_icache_line_size()-1)
+#else
+#define SIGMASK         ALMASK
+#endif
+
+void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
+                          size_t frame_size)
+{
+        unsigned long sp;
+
+        /* Leave space for potential extended context */
+        frame_size += extcontext_max_size();
+
+        /* 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;
+
+        sp = sigsp(sp, ksig);
+
+        return (void __user *)((sp - frame_size) & SIGMASK);
+}
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+
+#ifdef CONFIG_TRAD_SIGNALS
+SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset)
+{
+        return sys_rt_sigsuspend(uset, sizeof(sigset_t));
+}
+#endif
+
+#ifdef CONFIG_TRAD_SIGNALS
+SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
+        struct sigaction __user *, oact)
+{
+        struct k_sigaction new_ka, old_ka;
+        int ret;
+        int err = 0;
+
+        if (act) {
+                old_sigset_t mask;
+
+                if (!access_ok(act, sizeof(*act)))
+                        return -EFAULT;
+                err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
+                err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
+                err |= __get_user(mask, &act->sa_mask.sig[0]);
+                if (err)
+                        return -EFAULT;
+
+                siginitset(&new_ka.sa.sa_mask, mask);
+        }
+
+        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+        if (!ret && oact) {
+                if (!access_ok(oact, sizeof(*oact)))
+                        return -EFAULT;
+                err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+                err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
+                err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
+                err |= __put_user(0, &oact->sa_mask.sig[1]);
+                err |= __put_user(0, &oact->sa_mask.sig[2]);
+                err |= __put_user(0, &oact->sa_mask.sig[3]);
+                if (err)
+                        return -EFAULT;
+        }
+
+        return ret;
+}
+#endif
+
+#ifdef CONFIG_TRAD_SIGNALS
+asmlinkage void sys_sigreturn(void)
+{
+        struct sigframe __user *frame;
+        struct pt_regs *regs;
+        sigset_t blocked;
+        int sig;
+
+        regs = current_pt_regs();
+        frame = (struct sigframe __user *)regs->regs[29];
+        if (!access_ok(frame, sizeof(*frame)))
+                goto badframe;
+        if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
+                goto badframe;
+
+        set_current_blocked(&blocked);
+
+        sig = restore_sigcontext(regs, &frame->sf_sc);
+        if (sig < 0)
+                goto badframe;
+        else if (sig)
+                force_sig(sig);
+
+        /*
+         * Don't let your children do this ...
+         */
+        __asm__ __volatile__(
+                "move\t$29, %0\n\t"
+                "j\tsyscall_exit"
+                : /* no outputs */
+                : "r" (regs));
+        /* Unreached */
+
+badframe:
+        force_sig(SIGSEGV);
+}
+#endif /* CONFIG_TRAD_SIGNALS */
+
+asmlinkage void sys_rt_sigreturn(void)
+{
+        struct rt_sigframe __user *frame;
+        struct pt_regs *regs;
+        sigset_t set;
+        int sig;
+
+        regs = current_pt_regs();
+        frame = (struct rt_sigframe __user *)regs->regs[29];
+        if (!access_ok(frame, sizeof(*frame)))
+                goto badframe;
+        if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
+                goto badframe;
+
+        set_current_blocked(&set);
+
+        sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+        if (sig < 0)
+                goto badframe;
+        else if (sig)
+                force_sig(sig);
+
+        if (restore_altstack(&frame->rs_uc.uc_stack))
+                goto badframe;
+
+        /*
+         * Don't let your children do this ...
+         */
+        __asm__ __volatile__(
+                "move\t$29, %0\n\t"
+                "j\tsyscall_exit"
+                : /* no outputs */
+                : "r" (regs));
+        /* Unreached */
+
+badframe:
+        force_sig(SIGSEGV);
+}
+
+#ifdef CONFIG_TRAD_SIGNALS
+static int setup_frame(void *sig_return, struct ksignal *ksig,
+                       struct pt_regs *regs, sigset_t *set)
+{
+        struct sigframe __user *frame;
+        int err = 0;
+
+        frame = get_sigframe(ksig, regs, sizeof(*frame));
+        if (!access_ok(frame, sizeof (*frame)))
+                return -EFAULT;
+
+        err |= setup_sigcontext(regs, &frame->sf_sc);
+        err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
+        if (err)
+                return -EFAULT;
+
+        /*
+         * Arguments to signal handler:
+         *
+         *   a0 = signal number
+         *   a1 = 0 (should be cause)
+         *   a2 = pointer to struct sigcontext
+         *
+         * $25 and c0_epc point to the signal handler, $29 points to the
+         * struct sigframe.
+         */
+        regs->regs[ 4] = ksig->sig;
+        regs->regs[ 5] = 0;
+        regs->regs[ 6] = (unsigned long) &frame->sf_sc;
+        regs->regs[29] = (unsigned long) frame;
+        regs->regs[31] = (unsigned long) sig_return;
+        regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
+
+        DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
+               current->comm, current->pid,
+               frame, regs->cp0_epc, regs->regs[31]);
+        return 0;
+}
+#endif
+
+static int setup_rt_frame(void *sig_return, struct ksignal *ksig,
+                          struct pt_regs *regs, sigset_t *set)
+{
+        struct rt_sigframe __user *frame;
+        int err = 0;
+
+        frame = get_sigframe(ksig, regs, sizeof(*frame));
+        if (!access_ok(frame, sizeof (*frame)))
+                return -EFAULT;
+
+        /* Create siginfo.  */
+        err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info);
+
+        /* Create the ucontext.  */
+        err |= __put_user(0, &frame->rs_uc.uc_flags);
+        err |= __put_user(NULL, &frame->rs_uc.uc_link);
+        err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
+        err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+        err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
+
+        if (err)
+                return -EFAULT;
+
+        /*
+         * Arguments to signal handler:
+         *
+         *   a0 = signal number
+         *   a1 = 0 (should be cause)
+         *   a2 = pointer to ucontext
+         *
+         * $25 and c0_epc point to the signal handler, $29 points to
+         * the struct rt_sigframe.
+         */
+        regs->regs[ 4] = ksig->sig;
+        regs->regs[ 5] = (unsigned long) &frame->rs_info;
+        regs->regs[ 6] = (unsigned long) &frame->rs_uc;
+        regs->regs[29] = (unsigned long) frame;
+        regs->regs[31] = (unsigned long) sig_return;
+        regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
+
+        DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
+               current->comm, current->pid,
+               frame, regs->cp0_epc, regs->regs[31]);
+
+        return 0;
+}
+
+struct mips_abi mips_abi = {
+#ifdef CONFIG_TRAD_SIGNALS
+        .setup_frame    = setup_frame,
+#endif
+        .setup_rt_frame = setup_rt_frame,
+        .restart        = __NR_restart_syscall,
+
+        .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs),
+        .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr),
+        .off_sc_used_math = offsetof(struct sigcontext, sc_used_math),
+
+        .vdso           = &vdso_image,
+};
+
+static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
+{
+        sigset_t *oldset = sigmask_to_save();
+        int ret;
+        struct mips_abi *abi = current->thread.abi;
+        void *vdso = current->mm->context.vdso;
+
+        /*
+         * If we were emulating a delay slot instruction, exit that frame such
+         * that addresses in the sigframe are as expected for userland and we
+         * don't have a problem if we reuse the thread's frame for an
+         * instruction within the signal handler.
+         */
+        dsemul_thread_rollback(regs);
+
+        if (regs->regs[0]) {
+                switch(regs->regs[2]) {
+                case ERESTART_RESTARTBLOCK:
+                case ERESTARTNOHAND:
+                        regs->regs[2] = EINTR;
+                        break;
+                case ERESTARTSYS:
+                        if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
+                                regs->regs[2] = EINTR;
+                                break;
+                        }
+                        fallthrough;
+                case ERESTARTNOINTR:
+                        regs->regs[7] = regs->regs[26];
+                        regs->regs[2] = regs->regs[0];
+                        regs->cp0_epc -= 4;
+                }
+
+                regs->regs[0] = 0;              /* Don't deal with this again.  */
+        }
+
+        rseq_signal_deliver(ksig, regs);
+
+        if (sig_uses_siginfo(&ksig->ka, abi))
+                ret = abi->setup_rt_frame(vdso + abi->vdso->off_rt_sigreturn,
+                                          ksig, regs, oldset);
+        else
+                ret = abi->setup_frame(vdso + abi->vdso->off_sigreturn,
+                                       ksig, regs, oldset);
+
+        signal_setup_done(ret, ksig, 0);
+}
+
+static void do_signal(struct pt_regs *regs)
+{
+        struct ksignal ksig;
+
+        if (get_signal(&ksig)) {
+                /* Whee!  Actually deliver the signal.  */
+                handle_signal(&ksig, regs);
+                return;
+        }
+
+        if (regs->regs[0]) {
+                switch (regs->regs[2]) {
+                case ERESTARTNOHAND:
+                case ERESTARTSYS:
+                case ERESTARTNOINTR:
+                        regs->regs[2] = regs->regs[0];
+                        regs->regs[7] = regs->regs[26];
+                        regs->cp0_epc -= 4;
+                        break;
+
+                case ERESTART_RESTARTBLOCK:
+                        regs->regs[2] = current->thread.abi->restart;
+                        regs->regs[7] = regs->regs[26];
+                        regs->cp0_epc -= 4;
+                        break;
+                }
+                regs->regs[0] = 0;      /* Don't deal with this again.  */
+        }
+
+        /*
+         * If there's no signal to deliver, we just put the saved sigmask
+         * back
+         */
+        restore_saved_sigmask();
+}
+
+/*
+ * notification of userspace execution resumption
+ * - triggered by the TIF_WORK_MASK flags
+ */
+asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
+        __u32 thread_info_flags)
+{
+        local_irq_enable();
+
+        user_exit();
+
+        if (thread_info_flags & _TIF_UPROBE)
+                uprobe_notify_resume(regs);
+
+        /* deal with pending signal delivery */
+        if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
+                do_signal(regs);
+
+        if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+                tracehook_notify_resume(regs);
+                rseq_handle_notify_resume(NULL, regs);
+        }
+
+        user_enter();
+}
+
+#if defined(CONFIG_SMP) && defined(CONFIG_MIPS_FP_SUPPORT)
+static int smp_save_fp_context(void __user *sc)
+{
+        return raw_cpu_has_fpu
+               ? save_hw_fp_context(sc)
+               : copy_fp_to_sigcontext(sc);
+}
+
+static int smp_restore_fp_context(void __user *sc)
+{
+        return raw_cpu_has_fpu
+               ? restore_hw_fp_context(sc)
+               : copy_fp_from_sigcontext(sc);
+}
+#endif
+
+static int signal_setup(void)
+{
+        /*
+         * The offset from sigcontext to extended context should be the same
+         * regardless of the type of signal, such that userland can always know
+         * where to look if it wishes to find the extended context structures.
+         */
+        BUILD_BUG_ON((offsetof(struct sigframe, sf_extcontext) -
+                      offsetof(struct sigframe, sf_sc)) !=
+                     (offsetof(struct rt_sigframe, rs_uc.uc_extcontext) -
+                      offsetof(struct rt_sigframe, rs_uc.uc_mcontext)));
+
+#if defined(CONFIG_SMP) && defined(CONFIG_MIPS_FP_SUPPORT)
+        /* For now just do the cpu_has_fpu check when the functions are invoked */
+        save_fp_context = smp_save_fp_context;
+        restore_fp_context = smp_restore_fp_context;
+#else
+        if (cpu_has_fpu) {
+                save_fp_context = save_hw_fp_context;
+                restore_fp_context = restore_hw_fp_context;
+        } else {
+                save_fp_context = copy_fp_to_sigcontext;
+                restore_fp_context = copy_fp_from_sigcontext;
+        }
+#endif /* CONFIG_SMP */
+
+        return 0;
+}
+
+arch_initcall(signal_setup);