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 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
33 #include <sys/mutex.h>
34 #include <sys/syscallsubr.h>
36 #include <sys/sysent.h>
37 #include <sys/sysproto.h>
38 #include <machine/armreg.h>
40 #include <machine/vfp.h>
42 #include <compat/freebsd32/freebsd32_proto.h>
43 #include <compat/freebsd32/freebsd32_signal.h>
45 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
48 * The first two fields of a ucontext_t are the signal mask and the machine
49 * context. The next field is uc_link; we want to avoid destroying the link
50 * when copying out contexts.
52 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link)
55 static void get_fpcontext32(struct thread *td, mcontext32_vfp_t *);
59 * Stubs for machine dependent 32-bits system calls.
63 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap)
67 #define ARM_SYNC_ICACHE 0
68 #define ARM_DRAIN_WRITEBUF 1
71 #define ARM_GET_VFPSTATE 4
75 WRITE_SPECIALREG(TPIDR_EL0, uap->parms);
76 WRITE_SPECIALREG(TPIDRRO_EL0, uap->parms);
85 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0)
87 if ((uint64_t)args.addr + (uint64_t)args.size > 0xffffffff)
89 cpu_icache_sync_range_checked(args.addr, args.size);
92 case ARM_GET_VFPSTATE:
94 mcontext32_vfp_t mcontext_vfp;
100 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0)
102 if (args.mc_vfp_size != sizeof(mcontext_vfp))
105 get_fpcontext32(td, &mcontext_vfp);
107 bzero(&mcontext_vfp, sizeof(mcontext_vfp));
109 error = copyout(&mcontext_vfp,
110 (void *)(uintptr_t)args.mc_vfp,
111 sizeof(mcontext_vfp));
123 get_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp)
129 curpcb = curthread->td_pcb;
131 if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
133 * If we have just been running VFP instructions we will
134 * need to save the state to memcpy it below.
136 vfp_save_state(td, curpcb);
138 KASSERT(curpcb->pcb_fpusaved == &curpcb->pcb_fpustate,
139 ("Called get_fpcontext while the kernel is using the VFP"));
140 KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
141 ("Non-userspace FPU flags set in get_fpcontext"));
142 for (i = 0; i < 32; i++)
143 mcp->mcv_reg[i] = (uint64_t)curpcb->pcb_fpustate.vfp_regs[i];
144 mcp->mcv_fpscr = VFP_FPSCR_FROM_SRCR(curpcb->pcb_fpustate.vfp_fpcr,
145 curpcb->pcb_fpustate.vfp_fpsr);
151 set_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp)
160 for (i = 0; i < 32; i++)
161 pcb->pcb_fpustate.vfp_regs[i] = mcp->mcv_reg[i];
162 pcb->pcb_fpustate.vfp_fpsr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
163 pcb->pcb_fpustate.vfp_fpcr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
168 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags)
171 struct trapframe *tf;
177 if ((flags & GET_MC_CLEAR_RET) != 0) {
178 mcp->mc_gregset[0] = 0;
179 mcp->mc_gregset[16] = tf->tf_spsr & ~PSR_C;
181 mcp->mc_gregset[0] = tf->tf_x[0];
182 mcp->mc_gregset[16] = tf->tf_spsr;
184 for (i = 1; i < 15; i++)
185 mcp->mc_gregset[i] = tf->tf_x[i];
186 mcp->mc_gregset[15] = tf->tf_elr;
188 mcp->mc_vfp_size = 0;
191 memset(mcp->mc_spare, 0, sizeof(mcp->mc_spare));
195 set_mcontext32(struct thread *td, mcontext32_t *mcp)
197 struct trapframe *tf;
198 mcontext32_vfp_t mc_vfp;
203 for (i = 0; i < 15; i++)
204 tf->tf_x[i] = mcp->mc_gregset[i];
205 tf->tf_elr = mcp->mc_gregset[15];
206 tf->tf_spsr = mcp->mc_gregset[16];
208 if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != 0) {
209 if (copyin((void *)(uintptr_t)mcp->mc_vfp_ptr, &mc_vfp,
210 sizeof(mc_vfp)) != 0)
212 set_fpcontext32(td, &mc_vfp);
219 #define UC_COPY_SIZE offsetof(ucontext32_t, uc_link)
222 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
227 if (uap->ucp == NULL)
230 memset(&uc, 0, sizeof(uc));
231 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
232 PROC_LOCK(td->td_proc);
233 uc.uc_sigmask = td->td_sigmask;
234 PROC_UNLOCK(td->td_proc);
235 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
241 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
246 if (uap->ucp == NULL)
249 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
251 ret = set_mcontext32(td, &uc.uc_mcontext);
253 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask,
261 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
268 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
270 error = set_mcontext32(td, &uc.uc_mcontext);
274 /* Restore signal mask. */
275 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
277 return (EJUSTRETURN);
282 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
287 if (uap->oucp == NULL || uap->ucp == NULL)
290 bzero(&uc, sizeof(uc));
291 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
292 PROC_LOCK(td->td_proc);
293 uc.uc_sigmask = td->td_sigmask;
294 PROC_UNLOCK(td->td_proc);
295 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE);
297 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
299 ret = set_mcontext32(td, &uc.uc_mcontext);
300 kern_sigprocmask(td, SIG_SETMASK,
301 &uc.uc_sigmask, NULL, 0);
309 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
313 struct trapframe *tf;
314 struct sigframe32 *fp, frame;
316 struct siginfo32 siginfo;
317 struct sysentvec *sysent;
322 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
325 PROC_LOCK_ASSERT(p, MA_OWNED);
326 sig = ksi->ksi_signo;
327 code = ksi->ksi_code;
329 mtx_assert(&psp->ps_mtx, MA_OWNED);
331 onstack = sigonstack(tf->tf_x[13]);
333 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
336 /* Allocate and validate space for the signal handler context. */
337 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
338 SIGISMEMBER(psp->ps_sigonstack, sig)) {
339 fp = (struct sigframe32 *)((uintptr_t)td->td_sigstk.ss_sp +
340 td->td_sigstk.ss_size);
341 #if defined(COMPAT_43)
342 td->td_sigstk.ss_flags |= SS_ONSTACK;
345 fp = (struct sigframe32 *)td->td_frame->tf_x[13];
347 /* make room on the stack */
350 /* make the stack aligned */
351 fp = (struct sigframe32 *)((unsigned long)(fp) &~ (8 - 1));
352 /* Populate the siginfo frame. */
353 get_mcontext32(td, &frame.sf_uc.uc_mcontext, 0);
355 get_fpcontext32(td, &frame.sf_vfp);
356 frame.sf_uc.uc_mcontext.mc_vfp_size = sizeof(fp->sf_vfp);
357 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)(uintptr_t)&fp->sf_vfp;
359 frame.sf_uc.uc_mcontext.mc_vfp_size = 0;
360 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)NULL;
362 frame.sf_si = siginfo;
363 frame.sf_uc.uc_sigmask = *mask;
364 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
365 ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
366 frame.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
367 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
369 mtx_unlock(&psp->ps_mtx);
370 PROC_UNLOCK(td->td_proc);
372 /* Copy the sigframe out to the user's stack. */
373 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
374 /* Process has trashed its stack. Kill it. */
375 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
381 * Build context to run handler in. We invoke the handler
382 * directly, only returning via the trampoline. Note the
383 * trampoline version numbers are coordinated with machine-
384 * dependent code in libc.
388 tf->tf_x[1] = (register_t)&fp->sf_si;
389 tf->tf_x[2] = (register_t)&fp->sf_uc;
391 /* the trampoline uses r5 as the uc address */
392 tf->tf_x[5] = (register_t)&fp->sf_uc;
393 tf->tf_elr = (register_t)catcher;
394 tf->tf_x[13] = (register_t)fp;
395 sysent = p->p_sysent;
396 if (sysent->sv_sigcode_base != 0)
397 tf->tf_x[14] = (register_t)sysent->sv_sigcode_base;
399 tf->tf_x[14] = (register_t)(sysent->sv_psstrings -
400 *(sysent->sv_szsigcode));
401 /* Set the mode to enter in the signal handler */
402 if ((register_t)catcher & 1)
403 tf->tf_spsr |= PSR_T;
405 tf->tf_spsr &= ~PSR_T;
407 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_x[14],
411 mtx_lock(&psp->ps_mtx);
417 * COMPAT_FREEBSD32 assumes we have this system call when COMPAT_43 is defined.
418 * FreeBSD/arm provies a similar getpagesize() syscall.
420 #define ARM32_PAGE_SIZE 4096
422 ofreebsd32_getpagesize(struct thread *td,
423 struct ofreebsd32_getpagesize_args *uap)
426 td->td_retval[0] = ARM32_PAGE_SIZE;
431 * Mirror the osigreturn definition in kern_sig.c for !i386 platforms. This
432 * mirrors what's connected to the FreeBSD/arm syscall.
435 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
438 return (nosys(td, (struct nosys_args *)uap));