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

1 files changed, 290 insertions, 0 deletions

diff --git a/arch/mips/kernel/signal_o32.c b/arch/mips/kernel/signal_o32.c
new file mode 100644
index 000000000..299a7a28c
--- /dev/null
+++ b/arch/mips/kernel/signal_o32.c
@@ -0,0 +1,290 @@
+/*
+ * 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, 2006  Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2016, Imagination Technologies Ltd.
+ */
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched/signal.h>
+#include <linux/uaccess.h>
+
+#include <asm/abi.h>
+#include <asm/compat-signal.h>
+#include <asm/dsp.h>
+#include <asm/sim.h>
+#include <asm/unistd.h>
+
+#include "signal-common.h"
+
+/*
+ * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
+ */
+#define __NR_O32_restart_syscall        4253
+
+struct sigframe32 {
+        u32 sf_ass[4];          /* argument save space for o32 */
+        u32 sf_pad[2];          /* Was: signal trampoline */
+        struct sigcontext32 sf_sc;
+        compat_sigset_t sf_mask;
+};
+
+struct ucontext32 {
+        u32                 uc_flags;
+        s32                 uc_link;
+        compat_stack_t      uc_stack;
+        struct sigcontext32 uc_mcontext;
+        compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
+};
+
+struct rt_sigframe32 {
+        u32 rs_ass[4];                  /* argument save space for o32 */
+        u32 rs_pad[2];                  /* Was: signal trampoline */
+        compat_siginfo_t rs_info;
+        struct ucontext32 rs_uc;
+};
+
+static int setup_sigcontext32(struct pt_regs *regs,
+                              struct sigcontext32 __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]);
+
+        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);
+        }
+
+        /*
+         * Save FPU state to signal context.  Signal handler
+         * will "inherit" current FPU state.
+         */
+        err |= protected_save_fp_context(sc);
+
+        return err;
+}
+
+static int restore_sigcontext32(struct pt_regs *regs,
+                                struct sigcontext32 __user *sc)
+{
+        int err = 0;
+        s32 treg;
+        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);
+        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);
+}
+
+static int setup_frame_32(void *sig_return, struct ksignal *ksig,
+                          struct pt_regs *regs, sigset_t *set)
+{
+        struct sigframe32 __user *frame;
+        int err = 0;
+
+        frame = get_sigframe(ksig, regs, sizeof(*frame));
+        if (!access_ok(frame, sizeof (*frame)))
+                return -EFAULT;
+
+        err |= setup_sigcontext32(regs, &frame->sf_sc);
+        err |= __copy_conv_sigset_to_user(&frame->sf_mask, 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;
+}
+
+asmlinkage void sys32_rt_sigreturn(void)
+{
+        struct rt_sigframe32 __user *frame;
+        struct pt_regs *regs;
+        sigset_t set;
+        int sig;
+
+        regs = current_pt_regs();
+        frame = (struct rt_sigframe32 __user *)regs->regs[29];
+        if (!access_ok(frame, sizeof(*frame)))
+                goto badframe;
+        if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
+                goto badframe;
+
+        set_current_blocked(&set);
+
+        sig = restore_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
+        if (sig < 0)
+                goto badframe;
+        else if (sig)
+                force_sig(sig);
+
+        if (compat_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);
+}
+
+static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig,
+                             struct pt_regs *regs, sigset_t *set)
+{
+        struct rt_sigframe32 __user *frame;
+        int err = 0;
+
+        frame = get_sigframe(ksig, regs, sizeof(*frame));
+        if (!access_ok(frame, sizeof (*frame)))
+                return -EFAULT;
+
+        /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
+        err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
+
+        /* Create the ucontext.  */
+        err |= __put_user(0, &frame->rs_uc.uc_flags);
+        err |= __put_user(0, &frame->rs_uc.uc_link);
+        err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
+        err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
+        err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, 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_sigframe32.
+         */
+        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;
+}
+
+/*
+ * o32 compatibility on 64-bit kernels, without DSP ASE
+ */
+struct mips_abi mips_abi_32 = {
+        .setup_frame    = setup_frame_32,
+        .setup_rt_frame = setup_rt_frame_32,
+        .restart        = __NR_O32_restart_syscall,
+
+        .off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs),
+        .off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr),
+        .off_sc_used_math = offsetof(struct sigcontext32, sc_used_math),
+
+        .vdso           = &vdso_image_o32,
+};
+
+
+asmlinkage void sys32_sigreturn(void)
+{
+        struct sigframe32 __user *frame;
+        struct pt_regs *regs;
+        sigset_t blocked;
+        int sig;
+
+        regs = current_pt_regs();
+        frame = (struct sigframe32 __user *)regs->regs[29];
+        if (!access_ok(frame, sizeof(*frame)))
+                goto badframe;
+        if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
+                goto badframe;
+
+        set_current_blocked(&blocked);
+
+        sig = restore_sigcontext32(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);
+}