2 * Copyright (c) 2018 Olivier Houchard
3 * Copyright (c) 2017 Nuxi, https://nuxi.nl/
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 #include <sys/param.h>
32 #include <sys/mutex.h>
33 #include <sys/syscallsubr.h>
35 #include <sys/sysctl.h>
36 #include <sys/sysent.h>
37 #include <sys/sysproto.h>
38 #include <machine/armreg.h>
39 #include <machine/pcb.h>
41 #include <machine/vfp.h>
43 #include <compat/freebsd32/freebsd32_proto.h>
44 #include <compat/freebsd32/freebsd32_signal.h>
47 #include <vm/vm_param.h>
49 #include <vm/vm_map.h>
51 _Static_assert(sizeof(mcontext32_t) == 208, "mcontext32_t size incorrect");
52 _Static_assert(sizeof(ucontext32_t) == 260, "ucontext32_t size incorrect");
53 _Static_assert(sizeof(struct siginfo32) == 64, "struct siginfo32 size incorrect");
55 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
57 SYSCTL_NODE(_compat, OID_AUTO, arm, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
61 * The first two fields of a ucontext_t are the signal mask and the machine
62 * context. The next field is uc_link; we want to avoid destroying the link
63 * when copying out contexts.
65 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link)
68 * Stubs for machine dependent 32-bits system calls.
72 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap)
76 #define ARM_SYNC_ICACHE 0
77 #define ARM_DRAIN_WRITEBUF 1
80 #define ARM_GET_VFPSTATE 4
84 WRITE_SPECIALREG(tpidr_el0, uap->parms);
85 WRITE_SPECIALREG(tpidrro_el0, uap->parms);
94 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0)
96 if ((uint64_t)args.addr + (uint64_t)args.size > 0xffffffff)
98 cpu_icache_sync_range_checked(args.addr, args.size);
101 case ARM_GET_VFPSTATE:
103 mcontext32_vfp_t mcontext_vfp;
106 uint32_t mc_vfp_size;
109 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0)
111 if (args.mc_vfp_size != sizeof(mcontext_vfp))
114 get_fpcontext32(td, &mcontext_vfp);
116 bzero(&mcontext_vfp, sizeof(mcontext_vfp));
118 error = copyout(&mcontext_vfp,
119 (void *)(uintptr_t)args.mc_vfp,
120 sizeof(mcontext_vfp));
130 get_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp)
135 KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
136 P_SHOULDSTOP(td->td_proc),
137 ("not suspended thread %p", td));
139 memset(mcp, 0, sizeof(*mcp));
142 if ((pcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
144 * If we have just been running VFP instructions we will
145 * need to save the state to memcpy it below.
148 vfp_save_state(td, pcb);
150 KASSERT(pcb->pcb_fpusaved == &pcb->pcb_fpustate,
151 ("Called get_fpcontext32 while the kernel is using the VFP"));
152 KASSERT((pcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
153 ("Non-userspace FPU flags set in get_fpcontext32"));
154 for (i = 0; i < 32; i++)
155 mcp->mcv_reg[i] = (uint64_t)pcb->pcb_fpustate.vfp_regs[i];
156 mcp->mcv_fpscr = VFP_FPSCR_FROM_SRCR(pcb->pcb_fpustate.vfp_fpcr,
157 pcb->pcb_fpustate.vfp_fpsr);
162 set_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp)
171 for (i = 0; i < 32; i++)
172 pcb->pcb_fpustate.vfp_regs[i] = mcp->mcv_reg[i];
173 pcb->pcb_fpustate.vfp_fpsr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
174 pcb->pcb_fpustate.vfp_fpcr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
180 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags)
182 struct trapframe *tf;
187 if ((flags & GET_MC_CLEAR_RET) != 0) {
188 mcp->mc_gregset[0] = 0;
189 mcp->mc_gregset[16] = tf->tf_spsr & ~PSR_C;
191 mcp->mc_gregset[0] = tf->tf_x[0];
192 mcp->mc_gregset[16] = tf->tf_spsr;
194 for (i = 1; i < 15; i++)
195 mcp->mc_gregset[i] = tf->tf_x[i];
196 mcp->mc_gregset[15] = tf->tf_elr;
198 mcp->mc_vfp_size = 0;
201 memset(mcp->mc_spare, 0, sizeof(mcp->mc_spare));
205 set_mcontext32(struct thread *td, mcontext32_t *mcp)
207 struct trapframe *tf;
208 mcontext32_vfp_t mc_vfp;
214 spsr = mcp->mc_gregset[16];
216 * There is no PSR_SS in the 32-bit kernel so ignore it if it's set
217 * as we will set it later if needed.
219 if ((spsr & ~(PSR_SETTABLE_32 | PSR_SS)) !=
220 (tf->tf_spsr & ~(PSR_SETTABLE_32 | PSR_SS)))
223 spsr &= PSR_SETTABLE_32;
224 spsr |= tf->tf_spsr & ~PSR_SETTABLE_32;
226 if ((td->td_dbgflags & TDB_STEP) != 0) {
228 td->td_pcb->pcb_flags |= PCB_SINGLE_STEP;
229 WRITE_SPECIALREG(mdscr_el1,
230 READ_SPECIALREG(mdscr_el1) | MDSCR_SS);
233 for (i = 0; i < 15; i++)
234 tf->tf_x[i] = mcp->mc_gregset[i];
235 tf->tf_elr = mcp->mc_gregset[15];
238 if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != 0) {
239 if (copyin((void *)(uintptr_t)mcp->mc_vfp_ptr, &mc_vfp,
240 sizeof(mc_vfp)) != 0)
242 set_fpcontext32(td, &mc_vfp);
249 #define UC_COPY_SIZE offsetof(ucontext32_t, uc_link)
252 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
257 if (uap->ucp == NULL)
260 memset(&uc, 0, sizeof(uc));
261 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
262 PROC_LOCK(td->td_proc);
263 uc.uc_sigmask = td->td_sigmask;
264 PROC_UNLOCK(td->td_proc);
265 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
271 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
276 if (uap->ucp == NULL)
279 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
281 ret = set_mcontext32(td, &uc.uc_mcontext);
283 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask,
291 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
298 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
300 error = set_mcontext32(td, &uc.uc_mcontext);
304 /* Restore signal mask. */
305 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
307 return (EJUSTRETURN);
312 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
317 if (uap->oucp == NULL || uap->ucp == NULL)
320 bzero(&uc, sizeof(uc));
321 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
322 PROC_LOCK(td->td_proc);
323 uc.uc_sigmask = td->td_sigmask;
324 PROC_UNLOCK(td->td_proc);
325 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE);
327 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
329 ret = set_mcontext32(td, &uc.uc_mcontext);
330 kern_sigprocmask(td, SIG_SETMASK,
331 &uc.uc_sigmask, NULL, 0);
339 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
343 struct trapframe *tf;
344 struct sigframe32 *fp, frame;
346 struct siginfo32 siginfo;
347 struct sysentvec *sysent;
351 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
354 PROC_LOCK_ASSERT(p, MA_OWNED);
355 sig = ksi->ksi_signo;
357 mtx_assert(&psp->ps_mtx, MA_OWNED);
359 onstack = sigonstack(tf->tf_x[13]);
361 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
364 /* Allocate and validate space for the signal handler context. */
365 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
366 SIGISMEMBER(psp->ps_sigonstack, sig)) {
367 fp = (struct sigframe32 *)((uintptr_t)td->td_sigstk.ss_sp +
368 td->td_sigstk.ss_size);
369 #if defined(COMPAT_43)
370 td->td_sigstk.ss_flags |= SS_ONSTACK;
373 fp = (struct sigframe32 *)td->td_frame->tf_x[13];
375 /* make room on the stack */
378 /* make the stack aligned */
379 fp = (struct sigframe32 *)((unsigned long)(fp) &~ (8 - 1));
380 /* Populate the siginfo frame. */
381 get_mcontext32(td, &frame.sf_uc.uc_mcontext, 0);
383 get_fpcontext32(td, &frame.sf_vfp);
384 frame.sf_uc.uc_mcontext.mc_vfp_size = sizeof(fp->sf_vfp);
385 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)(uintptr_t)&fp->sf_vfp;
387 frame.sf_uc.uc_mcontext.mc_vfp_size = 0;
388 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)NULL;
390 frame.sf_si = siginfo;
391 frame.sf_uc.uc_sigmask = *mask;
392 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
393 ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
394 frame.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
395 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
397 mtx_unlock(&psp->ps_mtx);
398 PROC_UNLOCK(td->td_proc);
400 /* Copy the sigframe out to the user's stack. */
401 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
402 /* Process has trashed its stack. Kill it. */
403 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
409 * Build context to run handler in. We invoke the handler
410 * directly, only returning via the trampoline. Note the
411 * trampoline version numbers are coordinated with machine-
412 * dependent code in libc.
416 tf->tf_x[1] = (register_t)&fp->sf_si;
417 tf->tf_x[2] = (register_t)&fp->sf_uc;
419 /* the trampoline uses r5 as the uc address */
420 tf->tf_x[5] = (register_t)&fp->sf_uc;
421 tf->tf_elr = (register_t)catcher;
422 tf->tf_x[13] = (register_t)fp;
423 sysent = p->p_sysent;
425 tf->tf_x[14] = (register_t)PROC_SIGCODE(p);
427 tf->tf_x[14] = (register_t)(PROC_PS_STRINGS(p) -
428 *(sysent->sv_szsigcode));
429 /* Set the mode to enter in the signal handler */
430 if ((register_t)catcher & 1)
431 tf->tf_spsr |= PSR_T;
433 tf->tf_spsr &= ~PSR_T;
435 /* Clear the single step flag while in the signal handler */
436 if ((td->td_pcb->pcb_flags & PCB_SINGLE_STEP) != 0) {
437 td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP;
438 WRITE_SPECIALREG(mdscr_el1,
439 READ_SPECIALREG(mdscr_el1) & ~MDSCR_SS);
443 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_x[14],
447 mtx_lock(&psp->ps_mtx);
453 * Mirror the osigreturn definition in kern_sig.c for !i386 platforms. This
454 * mirrors what's connected to the FreeBSD/arm syscall.
457 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
460 return (nosys(td, (struct nosys_args *)uap));