From 781be8666c7cc05a9cce6011c9d9c1ba4e15770d Mon Sep 17 00:00:00 2001 From: Warner Losh Date: Thu, 23 Sep 2021 15:19:33 -0600 Subject: bsd-user/arm/signal.c: arm set_sigtramp_args Implement set_sigtramp_args to setup the arguments to the sigtramp calls. Signed-off-by: Stacey Son Signed-off-by: Warner Losh Reviewed-by: Richard Henderson --- bsd-user/arm/signal.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 bsd-user/arm/signal.c (limited to 'bsd-user/arm') diff --git a/bsd-user/arm/signal.c b/bsd-user/arm/signal.c new file mode 100644 index 0000000..3c0db30 --- /dev/null +++ b/bsd-user/arm/signal.c @@ -0,0 +1,60 @@ +/* + * arm signal functions + * + * Copyright (c) 2013 Stacey D. Son + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#include "qemu.h" + +/* + * Compare to arm/arm/machdep.c sendsig() + * Assumes that target stack frame memory is locked. + */ +abi_long set_sigtramp_args(CPUARMState *env, int sig, + struct target_sigframe *frame, + abi_ulong frame_addr, + struct target_sigaction *ka) +{ + /* + * Arguments to signal handler: + * r0 = signal number + * r1 = siginfo pointer + * r2 = ucontext pointer + * r5 = ucontext pointer + * pc = signal handler pointer + * sp = sigframe struct pointer + * lr = sigtramp at base of user stack + */ + + env->regs[0] = sig; + env->regs[1] = frame_addr + + offsetof(struct target_sigframe, sf_si); + env->regs[2] = frame_addr + + offsetof(struct target_sigframe, sf_uc); + + /* the trampoline uses r5 as the uc address */ + env->regs[5] = frame_addr + + offsetof(struct target_sigframe, sf_uc); + env->regs[TARGET_REG_PC] = ka->_sa_handler & ~1; + env->regs[TARGET_REG_SP] = frame_addr; + env->regs[TARGET_REG_LR] = TARGET_PS_STRINGS - TARGET_SZSIGCODE; + /* + * Low bit indicates whether or not we're entering thumb mode. + */ + cpsr_write(env, (ka->_sa_handler & 1) * CPSR_T, CPSR_T, CPSRWriteByInstr); + + return 0; +} -- cgit v1.1