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+/*
+ * ARM AArch64 specific signal definitions for bsd-user
+ *
+ * Copyright (c) 2015 Stacey D. Son <sson at FreeBSD>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "qemu/osdep.h"
+
+#include "qemu.h"
+
+/*
+ * Compare to sendsig() in sys/arm64/arm64/machdep.c
+ * Assumes that target stack frame memory is locked.
+ */
+abi_long set_sigtramp_args(CPUARMState *regs, int sig,
+ struct target_sigframe *frame,
+ abi_ulong frame_addr,
+ struct target_sigaction *ka)
+{
+ /*
+ * Arguments to signal handler:
+ * x0 = signal number
+ * x1 = siginfo pointer
+ * x2 = ucontext pointer
+ * pc/elr = signal handler pointer
+ * sp = sigframe struct pointer
+ * lr = sigtramp at base of user stack
+ */
+
+ regs->xregs[0] = sig;
+ regs->xregs[1] = frame_addr +
+ offsetof(struct target_sigframe, sf_si);
+ regs->xregs[2] = frame_addr +
+ offsetof(struct target_sigframe, sf_uc);
+
+ regs->pc = ka->_sa_handler;
+ regs->xregs[TARGET_REG_SP] = frame_addr;
+ regs->xregs[TARGET_REG_LR] = TARGET_PS_STRINGS - TARGET_SZSIGCODE;
+
+ return 0;
+}