/*
 * 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;
}