1 /*-
2 * Copyright (c) 2012 Juli Mallett <jmallett@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/11.1/sys/mips/mips/freebsd32_machdep.c 294930 2016-01-27 17:55:01Z jhb $
27 */
28
29 /*
30 * Based on nwhitehorn's COMPAT_FREEBSD32 support code for PowerPC64.
31 */
32
33 #include "opt_compat.h"
34
35 #define __ELF_WORD_SIZE 32
36
37 #include <sys/types.h>
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/sysent.h>
42 #include <sys/exec.h>
43 #include <sys/imgact.h>
44 #include <sys/malloc.h>
45 #include <sys/proc.h>
46 #include <sys/namei.h>
47 #include <sys/fcntl.h>
48 #include <sys/sysent.h>
49 #include <sys/imgact_elf.h>
50 #include <sys/syscall.h>
51 #include <sys/syscallsubr.h>
52 #include <sys/sysproto.h>
53 #include <sys/signalvar.h>
54 #include <sys/vnode.h>
55 #include <sys/linker.h>
56
57 #include <vm/vm.h>
58 #include <vm/vm_param.h>
59
60 #include <machine/md_var.h>
61 #include <machine/reg.h>
62 #include <machine/sigframe.h>
63 #include <machine/sysarch.h>
64
65 #include <compat/freebsd32/freebsd32_signal.h>
66 #include <compat/freebsd32/freebsd32_util.h>
67 #include <compat/freebsd32/freebsd32_proto.h>
68
69 static void freebsd32_exec_setregs(struct thread *, struct image_params *, u_long);
70 static int get_mcontext32(struct thread *, mcontext32_t *, int);
71 static int set_mcontext32(struct thread *, mcontext32_t *);
72 static void freebsd32_sendsig(sig_t, ksiginfo_t *, sigset_t *);
73
74 extern const char *freebsd32_syscallnames[];
75
76 struct sysentvec elf32_freebsd_sysvec = {
77 .sv_size = SYS_MAXSYSCALL,
78 .sv_table = freebsd32_sysent,
79 .sv_mask = 0,
80 .sv_errsize = 0,
81 .sv_errtbl = NULL,
82 .sv_transtrap = NULL,
83 .sv_fixup = __elfN(freebsd_fixup),
84 .sv_sendsig = freebsd32_sendsig,
85 .sv_sigcode = sigcode32,
86 .sv_szsigcode = &szsigcode32,
87 .sv_name = "FreeBSD ELF32",
88 .sv_coredump = __elfN(coredump),
89 .sv_imgact_try = NULL,
90 .sv_minsigstksz = MINSIGSTKSZ,
91 .sv_pagesize = PAGE_SIZE,
92 .sv_minuser = VM_MIN_ADDRESS,
93 .sv_maxuser = ((vm_offset_t)0x80000000),
94 .sv_usrstack = FREEBSD32_USRSTACK,
95 .sv_psstrings = FREEBSD32_PS_STRINGS,
96 .sv_stackprot = VM_PROT_ALL,
97 .sv_copyout_strings = freebsd32_copyout_strings,
98 .sv_setregs = freebsd32_exec_setregs,
99 .sv_fixlimit = NULL,
100 .sv_maxssiz = NULL,
101 .sv_flags = SV_ABI_FREEBSD | SV_ILP32,
102 .sv_set_syscall_retval = cpu_set_syscall_retval,
103 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
104 .sv_syscallnames = freebsd32_syscallnames,
105 .sv_schedtail = NULL,
106 .sv_thread_detach = NULL,
107 .sv_trap = NULL,
108 };
109 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
110
111 static Elf32_Brandinfo freebsd_brand_info = {
112 .brand = ELFOSABI_FREEBSD,
113 .machine = EM_MIPS,
114 .compat_3_brand = "FreeBSD",
115 .emul_path = NULL,
116 .interp_path = "/libexec/ld-elf.so.1",
117 .sysvec = &elf32_freebsd_sysvec,
118 .interp_newpath = "/libexec/ld-elf32.so.1",
119 .flags = 0
120 };
121
122 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
123 (sysinit_cfunc_t) elf32_insert_brand_entry,
124 &freebsd_brand_info);
125
126 static void
127 freebsd32_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
128 {
129 exec_setregs(td, imgp, stack);
130
131 /*
132 * See comment in exec_setregs about running 32-bit binaries with 64-bit
133 * registers.
134 */
135 td->td_frame->sp -= 65536;
136
137 /*
138 * Clear extended address space bit for userland.
139 */
140 td->td_frame->sr &= ~MIPS_SR_UX;
141 }
142
143 int
144 set_regs32(struct thread *td, struct reg32 *regs)
145 {
146 struct reg r;
147 unsigned i;
148
149 for (i = 0; i < NUMSAVEREGS; i++)
150 r.r_regs[i] = regs->r_regs[i];
151
152 return (set_regs(td, &r));
153 }
154
155 int
156 fill_regs32(struct thread *td, struct reg32 *regs)
157 {
158 struct reg r;
159 unsigned i;
160 int error;
161
162 error = fill_regs(td, &r);
163 if (error != 0)
164 return (error);
165
166 for (i = 0; i < NUMSAVEREGS; i++)
167 regs->r_regs[i] = r.r_regs[i];
168
169 return (0);
170 }
171
172 int
173 set_fpregs32(struct thread *td, struct fpreg32 *fpregs)
174 {
175 struct fpreg fp;
176 unsigned i;
177
178 for (i = 0; i < NUMFPREGS; i++)
179 fp.r_regs[i] = fpregs->r_regs[i];
180
181 return (set_fpregs(td, &fp));
182 }
183
184 int
185 fill_fpregs32(struct thread *td, struct fpreg32 *fpregs)
186 {
187 struct fpreg fp;
188 unsigned i;
189 int error;
190
191 error = fill_fpregs(td, &fp);
192 if (error != 0)
193 return (error);
194
195 for (i = 0; i < NUMFPREGS; i++)
196 fpregs->r_regs[i] = fp.r_regs[i];
197
198 return (0);
199 }
200
201 static int
202 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags)
203 {
204 mcontext_t mcp64;
205 unsigned i;
206 int error;
207
208 error = get_mcontext(td, &mcp64, flags);
209 if (error != 0)
210 return (error);
211
212 mcp->mc_onstack = mcp64.mc_onstack;
213 mcp->mc_pc = mcp64.mc_pc;
214 for (i = 0; i < 32; i++)
215 mcp->mc_regs[i] = mcp64.mc_regs[i];
216 mcp->sr = mcp64.sr;
217 mcp->mullo = mcp64.mullo;
218 mcp->mulhi = mcp64.mulhi;
219 mcp->mc_fpused = mcp64.mc_fpused;
220 for (i = 0; i < 33; i++)
221 mcp->mc_fpregs[i] = mcp64.mc_fpregs[i];
222 mcp->mc_fpc_eir = mcp64.mc_fpc_eir;
223 mcp->mc_tls = (int32_t)(intptr_t)mcp64.mc_tls;
224
225 return (0);
226 }
227
228 static int
229 set_mcontext32(struct thread *td, mcontext32_t *mcp)
230 {
231 mcontext_t mcp64;
232 unsigned i;
233
234 mcp64.mc_onstack = mcp->mc_onstack;
235 mcp64.mc_pc = mcp->mc_pc;
236 for (i = 0; i < 32; i++)
237 mcp64.mc_regs[i] = mcp->mc_regs[i];
238 mcp64.sr = mcp->sr;
239 mcp64.mullo = mcp->mullo;
240 mcp64.mulhi = mcp->mulhi;
241 mcp64.mc_fpused = mcp->mc_fpused;
242 for (i = 0; i < 33; i++)
243 mcp64.mc_fpregs[i] = mcp->mc_fpregs[i];
244 mcp64.mc_fpc_eir = mcp->mc_fpc_eir;
245 mcp64.mc_tls = (void *)(intptr_t)mcp->mc_tls;
246
247 return (set_mcontext(td, &mcp64));
248 }
249
250 int
251 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
252 {
253 ucontext32_t uc;
254 int error;
255
256 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp);
257
258 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) {
259 CTR1(KTR_SIG, "sigreturn: efault td=%p", td);
260 return (EFAULT);
261 }
262
263 error = set_mcontext32(td, &uc.uc_mcontext);
264 if (error != 0)
265 return (error);
266
267 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
268
269 #if 0
270 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x",
271 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]);
272 #endif
273
274 return (EJUSTRETURN);
275 }
276
277 /*
278 * The first two fields of a ucontext_t are the signal mask and the machine
279 * context. The next field is uc_link; we want to avoid destroying the link
280 * when copying out contexts.
281 */
282 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link)
283
284 int
285 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
286 {
287 ucontext32_t uc;
288 int ret;
289
290 if (uap->ucp == NULL)
291 ret = EINVAL;
292 else {
293 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
294 PROC_LOCK(td->td_proc);
295 uc.uc_sigmask = td->td_sigmask;
296 PROC_UNLOCK(td->td_proc);
297 ret = copyout(&uc, uap->ucp, UC32_COPY_SIZE);
298 }
299 return (ret);
300 }
301
302 int
303 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
304 {
305 ucontext32_t uc;
306 int ret;
307
308 if (uap->ucp == NULL)
309 ret = EINVAL;
310 else {
311 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
312 if (ret == 0) {
313 ret = set_mcontext32(td, &uc.uc_mcontext);
314 if (ret == 0) {
315 kern_sigprocmask(td, SIG_SETMASK,
316 &uc.uc_sigmask, NULL, 0);
317 }
318 }
319 }
320 return (ret == 0 ? EJUSTRETURN : ret);
321 }
322
323 int
324 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
325 {
326 ucontext32_t uc;
327 int ret;
328
329 if (uap->oucp == NULL || uap->ucp == NULL)
330 ret = EINVAL;
331 else {
332 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
333 PROC_LOCK(td->td_proc);
334 uc.uc_sigmask = td->td_sigmask;
335 PROC_UNLOCK(td->td_proc);
336 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE);
337 if (ret == 0) {
338 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
339 if (ret == 0) {
340 ret = set_mcontext32(td, &uc.uc_mcontext);
341 if (ret == 0) {
342 kern_sigprocmask(td, SIG_SETMASK,
343 &uc.uc_sigmask, NULL, 0);
344 }
345 }
346 }
347 }
348 return (ret == 0 ? EJUSTRETURN : ret);
349 }
350
351 #define UCONTEXT_MAGIC 0xACEDBADE
352
353 /*
354 * Send an interrupt to process.
355 *
356 * Stack is set up to allow sigcode stored
357 * at top to call routine, followed by kcall
358 * to sigreturn routine below. After sigreturn
359 * resets the signal mask, the stack, and the
360 * frame pointer, it returns to the user
361 * specified pc, psl.
362 */
363 static void
364 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
365 {
366 struct proc *p;
367 struct thread *td;
368 struct fpreg32 fpregs;
369 struct reg32 regs;
370 struct sigacts *psp;
371 struct sigframe32 sf, *sfp;
372 int sig;
373 int oonstack;
374 unsigned i;
375
376 td = curthread;
377 p = td->td_proc;
378 PROC_LOCK_ASSERT(p, MA_OWNED);
379 sig = ksi->ksi_signo;
380 psp = p->p_sigacts;
381 mtx_assert(&psp->ps_mtx, MA_OWNED);
382
383 fill_regs32(td, ®s);
384 oonstack = sigonstack(td->td_frame->sp);
385
386 /* save user context */
387 bzero(&sf, sizeof sf);
388 sf.sf_uc.uc_sigmask = *mask;
389 sf.sf_uc.uc_stack.ss_sp = (int32_t)(intptr_t)td->td_sigstk.ss_sp;
390 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
391 sf.sf_uc.uc_stack.ss_flags = td->td_sigstk.ss_flags;
392 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
393 sf.sf_uc.uc_mcontext.mc_pc = regs.r_regs[PC];
394 sf.sf_uc.uc_mcontext.mullo = regs.r_regs[MULLO];
395 sf.sf_uc.uc_mcontext.mulhi = regs.r_regs[MULHI];
396 sf.sf_uc.uc_mcontext.mc_tls = (int32_t)(intptr_t)td->td_md.md_tls;
397 sf.sf_uc.uc_mcontext.mc_regs[0] = UCONTEXT_MAGIC; /* magic number */
398 for (i = 1; i < 32; i++)
399 sf.sf_uc.uc_mcontext.mc_regs[i] = regs.r_regs[i];
400 sf.sf_uc.uc_mcontext.mc_fpused = td->td_md.md_flags & MDTD_FPUSED;
401 if (sf.sf_uc.uc_mcontext.mc_fpused) {
402 /* if FPU has current state, save it first */
403 if (td == PCPU_GET(fpcurthread))
404 MipsSaveCurFPState(td);
405 fill_fpregs32(td, &fpregs);
406 for (i = 0; i < 33; i++)
407 sf.sf_uc.uc_mcontext.mc_fpregs[i] = fpregs.r_regs[i];
408 }
409
410 /* Allocate and validate space for the signal handler context. */
411 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
412 SIGISMEMBER(psp->ps_sigonstack, sig)) {
413 sfp = (struct sigframe32 *)(((uintptr_t)td->td_sigstk.ss_sp +
414 td->td_sigstk.ss_size - sizeof(struct sigframe32))
415 & ~(sizeof(__int64_t) - 1));
416 } else
417 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_frame->sp -
418 sizeof(struct sigframe32)) & ~(sizeof(__int64_t) - 1));
419
420 /* Build the argument list for the signal handler. */
421 td->td_frame->a0 = sig;
422 td->td_frame->a2 = (register_t)(intptr_t)&sfp->sf_uc;
423 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
424 /* Signal handler installed with SA_SIGINFO. */
425 td->td_frame->a1 = (register_t)(intptr_t)&sfp->sf_si;
426 /* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */
427
428 /* fill siginfo structure */
429 sf.sf_si.si_signo = sig;
430 sf.sf_si.si_code = ksi->ksi_code;
431 sf.sf_si.si_addr = td->td_frame->badvaddr;
432 } else {
433 /* Old FreeBSD-style arguments. */
434 td->td_frame->a1 = ksi->ksi_code;
435 td->td_frame->a3 = td->td_frame->badvaddr;
436 /* sf.sf_ahu.sf_handler = catcher; */
437 }
438
439 mtx_unlock(&psp->ps_mtx);
440 PROC_UNLOCK(p);
441
442 /*
443 * Copy the sigframe out to the user's stack.
444 */
445 if (copyout(&sf, sfp, sizeof(struct sigframe32)) != 0) {
446 /*
447 * Something is wrong with the stack pointer.
448 * ...Kill the process.
449 */
450 PROC_LOCK(p);
451 sigexit(td, SIGILL);
452 }
453
454 td->td_frame->pc = (register_t)(intptr_t)catcher;
455 td->td_frame->t9 = (register_t)(intptr_t)catcher;
456 td->td_frame->sp = (register_t)(intptr_t)sfp;
457 /*
458 * Signal trampoline code is at base of user stack.
459 */
460 td->td_frame->ra = (register_t)(intptr_t)FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode);
461 PROC_LOCK(p);
462 mtx_lock(&psp->ps_mtx);
463 }
464
465 int
466 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap)
467 {
468 int error;
469 int32_t tlsbase;
470
471 switch (uap->op) {
472 case MIPS_SET_TLS:
473 td->td_md.md_tls = (void *)(intptr_t)uap->parms;
474 return (0);
475 case MIPS_GET_TLS:
476 tlsbase = (int32_t)(intptr_t)td->td_md.md_tls;
477 error = copyout(&tlsbase, uap->parms, sizeof(tlsbase));
478 return (error);
479 default:
480 break;
481 }
482 return (EINVAL);
483 }
484
485 void
486 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
487 size_t *off __unused)
488 {
489 }
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