1 files changed, 137 insertions, 0 deletions

diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h
new file mode 100644
index 000000000000..f9234df53253
--- /dev/null
+++ b/arch/mips/kernel/signal-common.h
@@ -0,0 +1,137 @@
+/*
+ * 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);
+}