From: Stacey Son <s...@freebsd.org> function to set up signal handler arguments it populates register values in `CPUARMState` based on the provided signal, signal frame, signal action, and frame address
Signed-off-by: Stacey Son <s...@freebsd.org> Signed-off-by: Ajeet Singh <itac...@freebsd.org> --- bsd-user/aarch64/signal.c | 53 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 bsd-user/aarch64/signal.c diff --git a/bsd-user/aarch64/signal.c b/bsd-user/aarch64/signal.c new file mode 100644 index 0000000000..98861f9ab3 --- /dev/null +++ b/bsd-user/aarch64/signal.c @@ -0,0 +1,53 @@ +/* + * 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; +} -- 2.34.1
