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![Brooks Davis](/assets/img/avatar_default.png)
In the next commit I will update syscalls.master to use struct __siginfo (which actually exists) so this update will be needed to make generated files (from make sysent) align. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D44380
472 lines
12 KiB
C
472 lines
12 KiB
C
/*-
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* Copyright (c) 2018 Olivier Houchard
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* Copyright (c) 2017 Nuxi, https://nuxi.nl/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/syscallsubr.h>
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#include <sys/ktr.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <machine/armreg.h>
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#include <machine/pcb.h>
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#ifdef VFP
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#include <machine/vfp.h>
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#endif
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#include <compat/freebsd32/freebsd32_proto.h>
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#include <compat/freebsd32/freebsd32_signal.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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_Static_assert(sizeof(mcontext32_t) == 208, "mcontext32_t size incorrect");
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_Static_assert(sizeof(ucontext32_t) == 260, "ucontext32_t size incorrect");
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_Static_assert(sizeof(struct __siginfo32) == 64,
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"struct __siginfo32 size incorrect");
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extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
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SYSCTL_NODE(_compat, OID_AUTO, arm, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"32-bit mode");
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/*
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* The first two fields of a ucontext_t are the signal mask and the machine
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* context. The next field is uc_link; we want to avoid destroying the link
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* when copying out contexts.
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*/
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#define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link)
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/*
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* Stubs for machine dependent 32-bits system calls.
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*/
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int
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freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap)
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{
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int error;
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#define ARM_SYNC_ICACHE 0
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#define ARM_DRAIN_WRITEBUF 1
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#define ARM_SET_TP 2
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#define ARM_GET_TP 3
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#define ARM_GET_VFPSTATE 4
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switch(uap->op) {
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case ARM_SET_TP:
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WRITE_SPECIALREG(tpidr_el0, uap->parms);
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WRITE_SPECIALREG(tpidrro_el0, uap->parms);
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return 0;
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case ARM_SYNC_ICACHE:
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{
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struct {
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uint32_t addr;
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uint32_t size;
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} args;
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if ((error = copyin(uap->parms, &args, sizeof(args))) != 0)
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return (error);
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if ((uint64_t)args.addr + (uint64_t)args.size > 0xffffffff)
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return (EINVAL);
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cpu_icache_sync_range_checked(
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(void *)(uintptr_t)args.addr, args.size);
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return 0;
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}
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case ARM_GET_VFPSTATE:
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{
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mcontext32_vfp_t mcontext_vfp;
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struct {
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uint32_t mc_vfp_size;
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uint32_t mc_vfp;
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} args;
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if ((error = copyin(uap->parms, &args, sizeof(args))) != 0)
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return (error);
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if (args.mc_vfp_size != sizeof(mcontext_vfp))
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return (EINVAL);
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#ifdef VFP
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get_fpcontext32(td, &mcontext_vfp);
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#else
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bzero(&mcontext_vfp, sizeof(mcontext_vfp));
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#endif
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error = copyout(&mcontext_vfp,
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(void *)(uintptr_t)args.mc_vfp,
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sizeof(mcontext_vfp));
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return error;
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}
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}
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return (EINVAL);
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}
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#ifdef VFP
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void
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get_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp)
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{
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struct pcb *pcb;
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int i;
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KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
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P_SHOULDSTOP(td->td_proc),
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("not suspended thread %p", td));
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memset(mcp, 0, sizeof(*mcp));
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pcb = td->td_pcb;
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if ((pcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
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/*
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* If we have just been running VFP instructions we will
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* need to save the state to memcpy it below.
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*/
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if (td == curthread)
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vfp_save_state(td, pcb);
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KASSERT(pcb->pcb_fpusaved == &pcb->pcb_fpustate,
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("Called get_fpcontext32 while the kernel is using the VFP"));
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KASSERT((pcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
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("Non-userspace FPU flags set in get_fpcontext32"));
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for (i = 0; i < 16; i++) {
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uint64_t *tmpreg = (uint64_t *)&pcb->pcb_fpustate.vfp_regs[i];
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mcp->mcv_reg[i * 2] = tmpreg[0];
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mcp->mcv_reg[i * 2 + 1] = tmpreg[1];
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}
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mcp->mcv_fpscr = VFP_FPSCR_FROM_SRCR(pcb->pcb_fpustate.vfp_fpcr,
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pcb->pcb_fpustate.vfp_fpsr);
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}
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}
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void
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set_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp)
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{
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struct pcb *pcb;
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int i;
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critical_enter();
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pcb = td->td_pcb;
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if (td == curthread)
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vfp_discard(td);
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for (i = 0; i < 16; i++) {
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uint64_t *tmpreg = (uint64_t *)&pcb->pcb_fpustate.vfp_regs[i];
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tmpreg[0] = mcp->mcv_reg[i * 2];
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tmpreg[1] = mcp->mcv_reg[i * 2 + 1];
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}
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pcb->pcb_fpustate.vfp_fpsr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
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pcb->pcb_fpustate.vfp_fpcr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
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critical_exit();
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}
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#endif
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static void
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get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags)
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{
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struct trapframe *tf;
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int i;
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tf = td->td_frame;
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if ((flags & GET_MC_CLEAR_RET) != 0) {
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mcp->mc_gregset[0] = 0;
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mcp->mc_gregset[16] = tf->tf_spsr & ~PSR_C;
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} else {
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mcp->mc_gregset[0] = tf->tf_x[0];
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mcp->mc_gregset[16] = tf->tf_spsr;
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}
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for (i = 1; i < 15; i++)
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mcp->mc_gregset[i] = tf->tf_x[i];
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mcp->mc_gregset[15] = tf->tf_elr;
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mcp->mc_vfp_size = 0;
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mcp->mc_vfp_ptr = 0;
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memset(mcp->mc_spare, 0, sizeof(mcp->mc_spare));
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}
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static int
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set_mcontext32(struct thread *td, mcontext32_t *mcp)
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{
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struct trapframe *tf;
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mcontext32_vfp_t mc_vfp;
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uint32_t spsr;
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int i;
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tf = td->td_frame;
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spsr = mcp->mc_gregset[16];
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/*
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* There is no PSR_SS in the 32-bit kernel so ignore it if it's set
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* as we will set it later if needed.
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*/
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if ((spsr & ~(PSR_SETTABLE_32 | PSR_SS)) !=
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(tf->tf_spsr & ~(PSR_SETTABLE_32 | PSR_SS)))
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return (EINVAL);
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spsr &= PSR_SETTABLE_32;
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spsr |= tf->tf_spsr & ~PSR_SETTABLE_32;
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if ((td->td_dbgflags & TDB_STEP) != 0) {
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spsr |= PSR_SS;
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td->td_pcb->pcb_flags |= PCB_SINGLE_STEP;
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WRITE_SPECIALREG(mdscr_el1,
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READ_SPECIALREG(mdscr_el1) | MDSCR_SS);
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}
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for (i = 0; i < 15; i++)
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tf->tf_x[i] = mcp->mc_gregset[i];
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tf->tf_elr = mcp->mc_gregset[15];
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tf->tf_spsr = spsr;
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#ifdef VFP
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if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != 0) {
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if (copyin((void *)(uintptr_t)mcp->mc_vfp_ptr, &mc_vfp,
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sizeof(mc_vfp)) != 0)
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return (EFAULT);
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set_fpcontext32(td, &mc_vfp);
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}
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#endif
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return (0);
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}
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#define UC_COPY_SIZE offsetof(ucontext32_t, uc_link)
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int
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freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
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{
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ucontext32_t uc;
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int ret;
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if (uap->ucp == NULL)
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ret = EINVAL;
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else {
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memset(&uc, 0, sizeof(uc));
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get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
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PROC_LOCK(td->td_proc);
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uc.uc_sigmask = td->td_sigmask;
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PROC_UNLOCK(td->td_proc);
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ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
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}
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return (ret);
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}
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int
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freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
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{
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ucontext32_t uc;
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int ret;
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if (uap->ucp == NULL)
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ret = EINVAL;
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else {
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ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
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if (ret == 0) {
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ret = set_mcontext32(td, &uc.uc_mcontext);
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if (ret == 0)
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kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask,
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NULL, 0);
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}
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}
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return (ret);
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}
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int
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freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
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{
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ucontext32_t uc;
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int error;
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if (uap == NULL)
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return (EFAULT);
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if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
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return (EFAULT);
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error = set_mcontext32(td, &uc.uc_mcontext);
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if (error != 0)
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return (0);
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/* Restore signal mask. */
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kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
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return (EJUSTRETURN);
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}
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int
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freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
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{
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ucontext32_t uc;
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int ret;
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if (uap->oucp == NULL || uap->ucp == NULL)
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ret = EINVAL;
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else {
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bzero(&uc, sizeof(uc));
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get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
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PROC_LOCK(td->td_proc);
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uc.uc_sigmask = td->td_sigmask;
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PROC_UNLOCK(td->td_proc);
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ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE);
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if (ret == 0) {
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ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
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if (ret == 0) {
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ret = set_mcontext32(td, &uc.uc_mcontext);
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kern_sigprocmask(td, SIG_SETMASK,
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&uc.uc_sigmask, NULL, 0);
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}
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}
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}
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return (ret);
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}
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void
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freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
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{
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struct thread *td;
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struct proc *p;
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struct trapframe *tf;
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struct sigframe32 *fp, frame;
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struct sigacts *psp;
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struct __siginfo32 siginfo;
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struct sysentvec *sysent;
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int onstack;
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int sig;
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siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
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td = curthread;
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p = td->td_proc;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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sig = ksi->ksi_signo;
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psp = p->p_sigacts;
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mtx_assert(&psp->ps_mtx, MA_OWNED);
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tf = td->td_frame;
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onstack = sigonstack(tf->tf_x[13]);
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CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
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catcher, sig);
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/* Allocate and validate space for the signal handler context. */
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if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
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SIGISMEMBER(psp->ps_sigonstack, sig)) {
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fp = (struct sigframe32 *)((uintptr_t)td->td_sigstk.ss_sp +
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td->td_sigstk.ss_size);
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#if defined(COMPAT_43)
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td->td_sigstk.ss_flags |= SS_ONSTACK;
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#endif
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} else
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fp = (struct sigframe32 *)td->td_frame->tf_x[13];
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/* make room on the stack */
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fp--;
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/* make the stack aligned */
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fp = (struct sigframe32 *)((unsigned long)(fp) &~ (8 - 1));
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/* Populate the siginfo frame. */
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get_mcontext32(td, &frame.sf_uc.uc_mcontext, 0);
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#ifdef VFP
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get_fpcontext32(td, &frame.sf_vfp);
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frame.sf_uc.uc_mcontext.mc_vfp_size = sizeof(fp->sf_vfp);
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frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)(uintptr_t)&fp->sf_vfp;
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#else
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frame.sf_uc.uc_mcontext.mc_vfp_size = 0;
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frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)NULL;
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#endif
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frame.sf_si = siginfo;
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frame.sf_uc.uc_sigmask = *mask;
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frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
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? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
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frame.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
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frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
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mtx_unlock(&psp->ps_mtx);
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PROC_UNLOCK(td->td_proc);
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/* Copy the sigframe out to the user's stack. */
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if (copyout(&frame, fp, sizeof(*fp)) != 0) {
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/* Process has trashed its stack. Kill it. */
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CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
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PROC_LOCK(p);
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sigexit(td, SIGILL);
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}
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/*
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* Build context to run handler in. We invoke the handler
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* directly, only returning via the trampoline. Note the
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* trampoline version numbers are coordinated with machine-
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* dependent code in libc.
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*/
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tf->tf_x[0] = sig;
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tf->tf_x[1] = (register_t)&fp->sf_si;
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tf->tf_x[2] = (register_t)&fp->sf_uc;
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/* the trampoline uses r5 as the uc address */
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tf->tf_x[5] = (register_t)&fp->sf_uc;
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tf->tf_elr = (register_t)catcher;
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tf->tf_x[13] = (register_t)fp;
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sysent = p->p_sysent;
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if (PROC_HAS_SHP(p))
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tf->tf_x[14] = (register_t)PROC_SIGCODE(p);
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else
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tf->tf_x[14] = (register_t)(PROC_PS_STRINGS(p) -
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*(sysent->sv_szsigcode));
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/* Set the mode to enter in the signal handler */
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if ((register_t)catcher & 1)
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tf->tf_spsr |= PSR_T;
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else
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tf->tf_spsr &= ~PSR_T;
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/* Clear the single step flag while in the signal handler */
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if ((td->td_pcb->pcb_flags & PCB_SINGLE_STEP) != 0) {
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td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP;
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WRITE_SPECIALREG(mdscr_el1,
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READ_SPECIALREG(mdscr_el1) & ~MDSCR_SS);
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isb();
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}
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CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_x[14],
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tf->tf_x[13]);
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PROC_LOCK(p);
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mtx_lock(&psp->ps_mtx);
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}
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#ifdef COMPAT_43
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/*
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* Mirror the osigreturn definition in kern_sig.c for !i386 platforms. This
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* mirrors what's connected to the FreeBSD/arm syscall.
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*/
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int
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ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
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|
{
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|
|
return (nosys(td, (struct nosys_args *)uap));
|
|
}
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#endif
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