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)
127 curpcb = curthread->td_pcb;
129 if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
131 * If we have just been running VFP instructions we will
132 * need to save the state to memcpy it below.
134 vfp_save_state(td, curpcb);
136 KASSERT(curpcb->pcb_fpusaved == &curpcb->pcb_fpustate,
137 ("Called get_fpcontext while the kernel is using the VFP"));
138 KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
139 ("Non-userspace FPU flags set in get_fpcontext"));
140 memcpy(mcp->mcv_reg, curpcb->pcb_fpustate.vfp_regs,
141 sizeof(mcp->mcv_reg));
142 mcp->mcv_fpscr = VFP_FPSCR_FROM_SRCR(curpcb->pcb_fpustate.vfp_fpcr,
143 curpcb->pcb_fpustate.vfp_fpsr);
149 set_fpcontext32(struct thread *td, mcontext32_vfp_t *mcp)
157 memcpy(pcb->pcb_fpustate.vfp_regs, mcp->mcv_reg,
158 sizeof(pcb->pcb_fpustate.vfp_regs));
159 pcb->pcb_fpustate.vfp_fpsr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
160 pcb->pcb_fpustate.vfp_fpcr = VFP_FPSR_FROM_FPSCR(mcp->mcv_fpscr);
165 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags)
168 struct trapframe *tf;
174 if ((flags & GET_MC_CLEAR_RET) != 0) {
175 mcp->mc_gregset[0] = 0;
176 mcp->mc_gregset[16] = tf->tf_spsr & ~PSR_C;
178 mcp->mc_gregset[0] = tf->tf_x[0];
179 mcp->mc_gregset[16] = tf->tf_spsr;
181 for (i = 1; i < 15; i++)
182 mcp->mc_gregset[i] = tf->tf_x[i];
183 mcp->mc_gregset[15] = tf->tf_elr;
185 mcp->mc_vfp_size = 0;
188 memset(mcp->mc_spare, 0, sizeof(mcp->mc_spare));
192 set_mcontext32(struct thread *td, mcontext32_t *mcp)
194 struct trapframe *tf;
195 mcontext32_vfp_t mc_vfp;
200 for (i = 0; i < 15; i++)
201 tf->tf_x[i] = mcp->mc_gregset[i];
202 tf->tf_elr = mcp->mc_gregset[15];
203 tf->tf_spsr = mcp->mc_gregset[16];
205 if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != 0) {
206 if (copyin((void *)(uintptr_t)mcp->mc_vfp_ptr, &mc_vfp,
207 sizeof(mc_vfp)) != 0)
209 set_fpcontext32(td, &mc_vfp);
216 #define UC_COPY_SIZE offsetof(ucontext32_t, uc_link)
219 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
224 if (uap->ucp == NULL)
227 memset(&uc, 0, sizeof(uc));
228 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
229 PROC_LOCK(td->td_proc);
230 uc.uc_sigmask = td->td_sigmask;
231 PROC_UNLOCK(td->td_proc);
232 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
238 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
243 if (uap->ucp == NULL)
246 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
248 ret = set_mcontext32(td, &uc.uc_mcontext);
250 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask,
258 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
265 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
267 error = set_mcontext32(td, &uc.uc_mcontext);
271 /* Restore signal mask. */
272 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
274 return (EJUSTRETURN);
279 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
284 if (uap->oucp == NULL || uap->ucp == NULL)
287 bzero(&uc, sizeof(uc));
288 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
289 PROC_LOCK(td->td_proc);
290 uc.uc_sigmask = td->td_sigmask;
291 PROC_UNLOCK(td->td_proc);
292 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE);
294 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
296 ret = set_mcontext32(td, &uc.uc_mcontext);
297 kern_sigprocmask(td, SIG_SETMASK,
298 &uc.uc_sigmask, NULL, 0);
306 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
310 struct trapframe *tf;
311 struct sigframe32 *fp, frame;
313 struct siginfo32 siginfo;
314 struct sysentvec *sysent;
319 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
322 PROC_LOCK_ASSERT(p, MA_OWNED);
323 sig = ksi->ksi_signo;
324 code = ksi->ksi_code;
326 mtx_assert(&psp->ps_mtx, MA_OWNED);
328 onstack = sigonstack(tf->tf_x[13]);
330 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
333 /* Allocate and validate space for the signal handler context. */
334 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
335 SIGISMEMBER(psp->ps_sigonstack, sig)) {
336 fp = (struct sigframe32 *)((uintptr_t)td->td_sigstk.ss_sp +
337 td->td_sigstk.ss_size);
338 #if defined(COMPAT_43)
339 td->td_sigstk.ss_flags |= SS_ONSTACK;
342 fp = (struct sigframe32 *)td->td_frame->tf_x[13];
344 /* make room on the stack */
347 /* make the stack aligned */
348 fp = (struct sigframe32 *)((unsigned long)(fp) &~ (8 - 1));
349 /* Populate the siginfo frame. */
350 get_mcontext32(td, &frame.sf_uc.uc_mcontext, 0);
352 get_fpcontext32(td, &frame.sf_vfp);
353 frame.sf_uc.uc_mcontext.mc_vfp_size = sizeof(fp->sf_vfp);
354 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)(uintptr_t)&fp->sf_vfp;
356 frame.sf_uc.uc_mcontext.mc_vfp_size = 0;
357 frame.sf_uc.uc_mcontext.mc_vfp_ptr = (uint32_t)NULL;
359 frame.sf_si = siginfo;
360 frame.sf_uc.uc_sigmask = *mask;
361 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
362 ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
363 frame.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
364 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
366 mtx_unlock(&psp->ps_mtx);
367 PROC_UNLOCK(td->td_proc);
369 /* Copy the sigframe out to the user's stack. */
370 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
371 /* Process has trashed its stack. Kill it. */
372 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
378 * Build context to run handler in. We invoke the handler
379 * directly, only returning via the trampoline. Note the
380 * trampoline version numbers are coordinated with machine-
381 * dependent code in libc.
385 tf->tf_x[1] = (register_t)&fp->sf_si;
386 tf->tf_x[2] = (register_t)&fp->sf_uc;
388 /* the trampoline uses r5 as the uc address */
389 tf->tf_x[5] = (register_t)&fp->sf_uc;
390 tf->tf_elr = (register_t)catcher;
391 tf->tf_x[13] = (register_t)fp;
392 sysent = p->p_sysent;
393 if (sysent->sv_sigcode_base != 0)
394 tf->tf_x[14] = (register_t)sysent->sv_sigcode_base;
396 tf->tf_x[14] = (register_t)(sysent->sv_psstrings -
397 *(sysent->sv_szsigcode));
398 /* Set the mode to enter in the signal handler */
399 if ((register_t)catcher & 1)
400 tf->tf_spsr |= PSR_T;
402 tf->tf_spsr &= ~PSR_T;
404 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_x[14],
408 mtx_lock(&psp->ps_mtx);