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781be8666c
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>
60 lines
2 KiB
C
60 lines
2 KiB
C
/*
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* arm signal functions
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*
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* Copyright (c) 2013 Stacey D. Son
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu.h"
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/*
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* Compare to arm/arm/machdep.c sendsig()
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* Assumes that target stack frame memory is locked.
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*/
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abi_long set_sigtramp_args(CPUARMState *env, int sig,
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struct target_sigframe *frame,
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abi_ulong frame_addr,
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struct target_sigaction *ka)
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{
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/*
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* Arguments to signal handler:
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* r0 = signal number
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* r1 = siginfo pointer
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* r2 = ucontext pointer
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* r5 = ucontext pointer
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* pc = signal handler pointer
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* sp = sigframe struct pointer
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* lr = sigtramp at base of user stack
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*/
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env->regs[0] = sig;
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env->regs[1] = frame_addr +
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offsetof(struct target_sigframe, sf_si);
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env->regs[2] = frame_addr +
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offsetof(struct target_sigframe, sf_uc);
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/* the trampoline uses r5 as the uc address */
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env->regs[5] = frame_addr +
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offsetof(struct target_sigframe, sf_uc);
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env->regs[TARGET_REG_PC] = ka->_sa_handler & ~1;
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env->regs[TARGET_REG_SP] = frame_addr;
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env->regs[TARGET_REG_LR] = TARGET_PS_STRINGS - TARGET_SZSIGCODE;
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/*
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* Low bit indicates whether or not we're entering thumb mode.
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*/
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cpsr_write(env, (ka->_sa_handler & 1) * CPSR_T, CPSR_T, CPSRWriteByInstr);
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return 0;
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}
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