2 * Copyright (c) 2014 Andrew Turner
3 * Copyright (c) 2015-2017 Ruslan Bukin <br@bsdpad.com>
6 * Portions of this software were developed by SRI International and the
7 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
8 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
10 * Portions of this software were developed by the University of Cambridge
11 * Computer Laboratory as part of the CTSRD Project, with support from the
12 * UK Higher Education Innovation Fund (HEIF).
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/systm.h>
42 #include <sys/imgact.h>
44 #include <sys/kernel.h>
46 #include <sys/limits.h>
48 #include <sys/mutex.h>
50 #include <sys/ptrace.h>
52 #include <sys/rwlock.h>
53 #include <sys/sched.h>
54 #include <sys/signalvar.h>
55 #include <sys/syscallsubr.h>
56 #include <sys/sysent.h>
57 #include <sys/sysproto.h>
58 #include <sys/ucontext.h>
60 #include <machine/cpu.h>
61 #include <machine/kdb.h>
62 #include <machine/pcb.h>
63 #include <machine/pte.h>
64 #include <machine/riscvreg.h>
65 #include <machine/sbi.h>
66 #include <machine/trap.h>
69 #include <vm/vm_param.h>
71 #include <vm/vm_map.h>
74 #include <machine/fpe.h>
77 static void get_fpcontext(struct thread *td, mcontext_t *mcp);
78 static void set_fpcontext(struct thread *td, mcontext_t *mcp);
81 fill_regs(struct thread *td, struct reg *regs)
83 struct trapframe *frame;
86 regs->sepc = frame->tf_sepc;
87 regs->sstatus = frame->tf_sstatus;
88 regs->ra = frame->tf_ra;
89 regs->sp = frame->tf_sp;
90 regs->gp = frame->tf_gp;
91 regs->tp = frame->tf_tp;
93 memcpy(regs->t, frame->tf_t, sizeof(regs->t));
94 memcpy(regs->s, frame->tf_s, sizeof(regs->s));
95 memcpy(regs->a, frame->tf_a, sizeof(regs->a));
101 set_regs(struct thread *td, struct reg *regs)
103 struct trapframe *frame;
105 frame = td->td_frame;
106 frame->tf_sepc = regs->sepc;
107 frame->tf_ra = regs->ra;
108 frame->tf_sp = regs->sp;
109 frame->tf_gp = regs->gp;
110 frame->tf_tp = regs->tp;
112 memcpy(frame->tf_t, regs->t, sizeof(frame->tf_t));
113 memcpy(frame->tf_s, regs->s, sizeof(frame->tf_s));
114 memcpy(frame->tf_a, regs->a, sizeof(frame->tf_a));
120 fill_fpregs(struct thread *td, struct fpreg *regs)
127 if ((pcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
129 * If we have just been running FPE instructions we will
130 * need to save the state to memcpy it below.
135 memcpy(regs->fp_x, pcb->pcb_x, sizeof(regs->fp_x));
136 regs->fp_fcsr = pcb->pcb_fcsr;
139 memset(regs, 0, sizeof(*regs));
145 set_fpregs(struct thread *td, struct fpreg *regs)
148 struct trapframe *frame;
151 frame = td->td_frame;
154 memcpy(pcb->pcb_x, regs->fp_x, sizeof(regs->fp_x));
155 pcb->pcb_fcsr = regs->fp_fcsr;
156 pcb->pcb_fpflags |= PCB_FP_STARTED;
157 frame->tf_sstatus &= ~SSTATUS_FS_MASK;
158 frame->tf_sstatus |= SSTATUS_FS_CLEAN;
165 fill_dbregs(struct thread *td, struct dbreg *regs)
168 panic("fill_dbregs");
172 set_dbregs(struct thread *td, struct dbreg *regs)
179 exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack)
181 struct trapframe *tf;
187 memset(tf, 0, sizeof(struct trapframe));
190 tf->tf_sp = STACKALIGN(stack);
191 tf->tf_ra = imgp->entry_addr;
192 tf->tf_sepc = imgp->entry_addr;
194 pcb->pcb_fpflags &= ~PCB_FP_STARTED;
197 /* Sanity check these are the same size, they will be memcpy'd to and from */
198 CTASSERT(sizeof(((struct trapframe *)0)->tf_a) ==
199 sizeof((struct gpregs *)0)->gp_a);
200 CTASSERT(sizeof(((struct trapframe *)0)->tf_s) ==
201 sizeof((struct gpregs *)0)->gp_s);
202 CTASSERT(sizeof(((struct trapframe *)0)->tf_t) ==
203 sizeof((struct gpregs *)0)->gp_t);
204 CTASSERT(sizeof(((struct trapframe *)0)->tf_a) ==
205 sizeof((struct reg *)0)->a);
206 CTASSERT(sizeof(((struct trapframe *)0)->tf_s) ==
207 sizeof((struct reg *)0)->s);
208 CTASSERT(sizeof(((struct trapframe *)0)->tf_t) ==
209 sizeof((struct reg *)0)->t);
212 get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
214 struct trapframe *tf = td->td_frame;
216 memcpy(mcp->mc_gpregs.gp_t, tf->tf_t, sizeof(mcp->mc_gpregs.gp_t));
217 memcpy(mcp->mc_gpregs.gp_s, tf->tf_s, sizeof(mcp->mc_gpregs.gp_s));
218 memcpy(mcp->mc_gpregs.gp_a, tf->tf_a, sizeof(mcp->mc_gpregs.gp_a));
220 if (clear_ret & GET_MC_CLEAR_RET) {
221 mcp->mc_gpregs.gp_a[0] = 0;
222 mcp->mc_gpregs.gp_t[0] = 0; /* clear syscall error */
225 mcp->mc_gpregs.gp_ra = tf->tf_ra;
226 mcp->mc_gpregs.gp_sp = tf->tf_sp;
227 mcp->mc_gpregs.gp_gp = tf->tf_gp;
228 mcp->mc_gpregs.gp_tp = tf->tf_tp;
229 mcp->mc_gpregs.gp_sepc = tf->tf_sepc;
230 mcp->mc_gpregs.gp_sstatus = tf->tf_sstatus;
231 get_fpcontext(td, mcp);
237 set_mcontext(struct thread *td, mcontext_t *mcp)
239 struct trapframe *tf;
244 * Permit changes to the USTATUS bits of SSTATUS.
246 * Ignore writes to read-only bits (SD, XS).
248 * Ignore writes to the FS field as set_fpcontext() will set
251 if (((mcp->mc_gpregs.gp_sstatus ^ tf->tf_sstatus) &
252 ~(SSTATUS_SD | SSTATUS_XS_MASK | SSTATUS_FS_MASK | SSTATUS_UPIE |
256 memcpy(tf->tf_t, mcp->mc_gpregs.gp_t, sizeof(tf->tf_t));
257 memcpy(tf->tf_s, mcp->mc_gpregs.gp_s, sizeof(tf->tf_s));
258 memcpy(tf->tf_a, mcp->mc_gpregs.gp_a, sizeof(tf->tf_a));
260 tf->tf_ra = mcp->mc_gpregs.gp_ra;
261 tf->tf_sp = mcp->mc_gpregs.gp_sp;
262 tf->tf_gp = mcp->mc_gpregs.gp_gp;
263 tf->tf_sepc = mcp->mc_gpregs.gp_sepc;
264 tf->tf_sstatus = mcp->mc_gpregs.gp_sstatus;
265 set_fpcontext(td, mcp);
271 get_fpcontext(struct thread *td, mcontext_t *mcp)
278 curpcb = curthread->td_pcb;
280 KASSERT(td->td_pcb == curpcb, ("Invalid fpe pcb"));
282 if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
284 * If we have just been running FPE instructions we will
285 * need to save the state to memcpy it below.
289 KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
290 ("Non-userspace FPE flags set in get_fpcontext"));
291 memcpy(mcp->mc_fpregs.fp_x, curpcb->pcb_x,
292 sizeof(mcp->mc_fpregs.fp_x));
293 mcp->mc_fpregs.fp_fcsr = curpcb->pcb_fcsr;
294 mcp->mc_fpregs.fp_flags = curpcb->pcb_fpflags;
295 mcp->mc_flags |= _MC_FP_VALID;
303 set_fpcontext(struct thread *td, mcontext_t *mcp)
309 td->td_frame->tf_sstatus &= ~SSTATUS_FS_MASK;
310 td->td_frame->tf_sstatus |= SSTATUS_FS_OFF;
315 if ((mcp->mc_flags & _MC_FP_VALID) != 0) {
316 curpcb = curthread->td_pcb;
317 /* FPE usage is enabled, override registers. */
318 memcpy(curpcb->pcb_x, mcp->mc_fpregs.fp_x,
319 sizeof(mcp->mc_fpregs.fp_x));
320 curpcb->pcb_fcsr = mcp->mc_fpregs.fp_fcsr;
321 curpcb->pcb_fpflags = mcp->mc_fpregs.fp_flags & PCB_FP_USERMASK;
322 td->td_frame->tf_sstatus |= SSTATUS_FS_CLEAN;
330 sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
335 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
338 error = set_mcontext(td, &uc.uc_mcontext);
342 /* Restore signal mask. */
343 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
345 return (EJUSTRETURN);
349 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
351 struct sigframe *fp, frame;
352 struct sysentvec *sysent;
353 struct trapframe *tf;
362 PROC_LOCK_ASSERT(p, MA_OWNED);
364 sig = ksi->ksi_signo;
366 mtx_assert(&psp->ps_mtx, MA_OWNED);
369 onstack = sigonstack(tf->tf_sp);
371 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
374 /* Allocate and validate space for the signal handler context. */
375 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack &&
376 SIGISMEMBER(psp->ps_sigonstack, sig)) {
377 fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
378 td->td_sigstk.ss_size);
380 fp = (struct sigframe *)td->td_frame->tf_sp;
383 /* Make room, keeping the stack aligned */
385 fp = (struct sigframe *)STACKALIGN(fp);
387 /* Fill in the frame to copy out */
388 bzero(&frame, sizeof(frame));
389 get_mcontext(td, &frame.sf_uc.uc_mcontext, 0);
390 frame.sf_si = ksi->ksi_info;
391 frame.sf_uc.uc_sigmask = *mask;
392 frame.sf_uc.uc_stack = td->td_sigstk;
393 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ?
394 (onstack ? SS_ONSTACK : 0) : SS_DISABLE;
395 mtx_unlock(&psp->ps_mtx);
396 PROC_UNLOCK(td->td_proc);
398 /* Copy the sigframe out to the user's stack. */
399 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
400 /* Process has trashed its stack. Kill it. */
401 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
407 tf->tf_a[1] = (register_t)&fp->sf_si;
408 tf->tf_a[2] = (register_t)&fp->sf_uc;
410 tf->tf_sepc = (register_t)catcher;
411 tf->tf_sp = (register_t)fp;
413 sysent = p->p_sysent;
414 if (sysent->sv_sigcode_base != 0)
415 tf->tf_ra = (register_t)sysent->sv_sigcode_base;
417 tf->tf_ra = (register_t)(PROC_PS_STRINGS(p) -
418 *(sysent->sv_szsigcode));
420 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_sepc,
424 mtx_lock(&psp->ps_mtx);