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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 <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2021-09-23 15:19:33 -06:00
parent 2cb1e6432f
commit 781be8666c
1 changed files with 60 additions and 0 deletions
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60
bsd-user/arm/signal.c Normal file
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/*
* 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 <http://www.gnu.org/licenses/>.
*/
#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;
}