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 <machine/armreg.h>
39 #include <machine/vfp.h>
41 #include <compat/freebsd32/freebsd32_proto.h>
42 #include <compat/freebsd32/freebsd32_signal.h>
44 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
47 * The first two fields of a ucontext_t are the signal mask and the machine
48 * context. The next field is uc_link; we want to avoid destroying the link
49 * when copying out contexts.
51 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link)
54 static void get_fpcontext32(struct thread *td, mcontext32_vfp_t *);
58 * Stubs for machine dependent 32-bits system calls.
62 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap)
66 #define ARM_SYNC_ICACHE 0
67 #define ARM_DRAIN_WRITEBUF 1
70 #define ARM_GET_VFPSTATE 4
74 WRITE_SPECIALREG(TPIDR_EL0, uap->parms);
75 WRITE_SPECIALREG(TPIDRRO_EL0, uap->parms);
84 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0)
86 if ((uint64_t)args.addr + (uint64_t)args.size > 0xffffffff)
88 cpu_icache_sync_range_checked(args.addr, args.size);
91 case ARM_GET_VFPSTATE:
93 mcontext32_vfp_t mcontext_vfp;
99 if ((error = copyin(uap->parms, &args, sizeof(args))) != 0)
101 if (args.mc_vfp_size != sizeof(mcontext_vfp))
104 get_fpcontext32(td, &mcontext_vfp);
106 bzero(&mcontext_vfp, sizeof(mcontext_vfp));
108 error = copyout(&mcontext_vfp,
109 (void *)(uintptr_t)args.mc_vfp,
110 sizeof(mcontext_vfp));
122 get_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp)
128 curpcb = curthread->td_pcb;
130 if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
132 * If we have just been running VFP instructions we will
133 * need to save the state to memcpy it below.
135 vfp_save_state(td, curpcb);
137 KASSERT(curpcb->pcb_fpusaved == &curpcb->pcb_fpustate,
138 ("Called get_fpcontext while the kernel is using the VFP"));
139 KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
140 ("Non-userspace FPU flags set in get_fpcontext"));
141 for (i = 0; i < 32; i++)
142 mcp->mcv_reg[i] = (uint64_t)curpcb->pcb_fpustate.vfp_regs[i];
143 mcp->mcv_fpscr = VFP_FPSCR_FROM_SRCR(curpcb->pcb_fpustate.vfp_fpcr,
144 curpcb->pcb_fpustate.vfp_fpsr);
150 set_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp)
159 for (i = 0; i < 32; i++)
160 pcb->pcb_fpustate.vfp_regs[i] = mcp->mcv_reg[i];
161 pcb->pcb_fpustate.vfp_fpsr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
162 pcb->pcb_fpustate.vfp_fpcr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
167 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags)
170 struct trapframe *tf;
176 if ((flags & GET_MC_CLEAR_RET) != 0) {
177 mcp->mc_gregset[0] = 0;
178 mcp->mc_gregset[16] = tf->tf_spsr & ~PSR_C;
180 mcp->mc_gregset[0] = tf->tf_x[0];
181 mcp->mc_gregset[16] = tf->tf_spsr;
183 for (i = 1; i < 15; i++)
184 mcp->mc_gregset[i] = tf->tf_x[i];
185 mcp->mc_gregset[15] = tf->tf_elr;
187 mcp->mc_vfp_size = 0;
190 memset(mcp->mc_spare, 0, sizeof(mcp->mc_spare));
194 set_mcontext32(struct thread *td, mcontext32_t *mcp)
196 struct trapframe *tf;
197 mcontext32_vfp_t mc_vfp;
202 for (i = 0; i < 15; i++)
203 tf->tf_x[i] = mcp->mc_gregset[i];
204 tf->tf_elr = mcp->mc_gregset[15];
205 tf->tf_spsr = mcp->mc_gregset[16];
207 if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != 0) {
208 if (copyin((void *)(uintptr_t)mcp->mc_vfp_ptr, &mc_vfp,
209 sizeof(mc_vfp)) != 0)
211 set_fpcontext32(td, &mc_vfp);
218 #define UC_COPY_SIZE offsetof(ucontext32_t, uc_link)
221 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
226 if (uap->ucp == NULL)
229 memset(&uc, 0, sizeof(uc));
230 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
231 PROC_LOCK(td->td_proc);
232 uc.uc_sigmask = td->td_sigmask;
233 PROC_UNLOCK(td->td_proc);
234 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
240 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
245 if (uap->ucp == NULL)
248 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
250 ret = set_mcontext32(td, &uc.uc_mcontext);
252 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask,
260 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
267 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
269 error = set_mcontext32(td, &uc.uc_mcontext);
273 /* Restore signal mask. */
274 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
276 return (EJUSTRETURN);
281 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
286 if (uap->oucp == NULL || uap->ucp == NULL)
289 bzero(&uc, sizeof(uc));
290 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
291 PROC_LOCK(td->td_proc);
292 uc.uc_sigmask = td->td_sigmask;
293 PROC_UNLOCK(td->td_proc);
294 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE);
296 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
298 ret = set_mcontext32(td, &uc.uc_mcontext);
299 kern_sigprocmask(td, SIG_SETMASK,
300 &uc.uc_sigmask, NULL, 0);
308 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
312 struct trapframe *tf;
313 struct sigframe32 *fp, frame;
315 struct siginfo32 siginfo;
316 struct sysentvec *sysent;
321 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
324 PROC_LOCK_ASSERT(p, MA_OWNED);
325 sig = ksi->ksi_signo;
326 code = ksi->ksi_code;
328 mtx_assert(&psp->ps_mtx, MA_OWNED);
330 onstack = sigonstack(tf->tf_x[13]);
332 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
335 /* Allocate and validate space for the signal handler context. */
336 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
337 SIGISMEMBER(psp->ps_sigonstack, sig)) {
338 fp = (struct sigframe32 *)((uintptr_t)td->td_sigstk.ss_sp +
339 td->td_sigstk.ss_size);
340 #if defined(COMPAT_43)
341 td->td_sigstk.ss_flags |= SS_ONSTACK;
344 fp = (struct sigframe32 *)td->td_frame->tf_x[13];
346 /* make room on the stack */
349 /* make the stack aligned */
350 fp = (struct sigframe32 *)((unsigned long)(fp) &~ (8 - 1));
351 /* Populate the siginfo frame. */
352 get_mcontext32(td, &frame.sf_uc.uc_mcontext, 0);
354 get_fpcontext32(td, &frame.sf_vfp);
355 frame.sf_uc.uc_mcontext.mc_vfp_size = sizeof(fp->sf_vfp);
356 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)(uintptr_t)&fp->sf_vfp;
358 frame.sf_uc.uc_mcontext.mc_vfp_size = 0;
359 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)NULL;
361 frame.sf_si = siginfo;
362 frame.sf_uc.uc_sigmask = *mask;
363 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
364 ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
365 frame.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
366 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
368 mtx_unlock(&psp->ps_mtx);
369 PROC_UNLOCK(td->td_proc);
371 /* Copy the sigframe out to the user's stack. */
372 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
373 /* Process has trashed its stack. Kill it. */
374 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
380 * Build context to run handler in. We invoke the handler
381 * directly, only returning via the trampoline. Note the
382 * trampoline version numbers are coordinated with machine-
383 * dependent code in libc.
387 tf->tf_x[1] = (register_t)&fp->sf_si;
388 tf->tf_x[2] = (register_t)&fp->sf_uc;
390 /* the trampoline uses r5 as the uc address */
391 tf->tf_x[5] = (register_t)&fp->sf_uc;
392 tf->tf_elr = (register_t)catcher;
393 tf->tf_x[13] = (register_t)fp;
394 sysent = p->p_sysent;
395 if (sysent->sv_sigcode_base != 0)
396 tf->tf_x[14] = (register_t)sysent->sv_sigcode_base;
398 tf->tf_x[14] = (register_t)(sysent->sv_psstrings -
399 *(sysent->sv_szsigcode));
400 /* Set the mode to enter in the signal handler */
401 if ((register_t)catcher & 1)
402 tf->tf_spsr |= PSR_T;
404 tf->tf_spsr &= ~PSR_T;
406 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_x[14],
410 mtx_lock(&psp->ps_mtx);