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/10.0/sys/mips/mips/freebsd32_machdep.c 232896 2012-03-12 21:25:32Z jmallett $
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 *, const 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_sigsize = 0,
81 .sv_sigtbl = NULL,
82 .sv_errsize = 0,
83 .sv_errtbl = NULL,
84 .sv_transtrap = NULL,
85 .sv_fixup = __elfN(freebsd_fixup),
86 .sv_sendsig = freebsd32_sendsig,
87 .sv_sigcode = sigcode32,
88 .sv_szsigcode = &szsigcode32,
89 .sv_prepsyscall = NULL,
90 .sv_name = "FreeBSD ELF32",
91 .sv_coredump = __elfN(coredump),
92 .sv_imgact_try = NULL,
93 .sv_minsigstksz = MINSIGSTKSZ,
94 .sv_pagesize = PAGE_SIZE,
95 .sv_minuser = VM_MIN_ADDRESS,
96 .sv_maxuser = ((vm_offset_t)0x80000000),
97 .sv_usrstack = FREEBSD32_USRSTACK,
98 .sv_psstrings = FREEBSD32_PS_STRINGS,
99 .sv_stackprot = VM_PROT_ALL,
100 .sv_copyout_strings = freebsd32_copyout_strings,
101 .sv_setregs = freebsd32_exec_setregs,
102 .sv_fixlimit = NULL,
103 .sv_maxssiz = NULL,
104 .sv_flags = SV_ABI_FREEBSD | SV_ILP32,
105 .sv_set_syscall_retval = cpu_set_syscall_retval,
106 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
107 .sv_syscallnames = freebsd32_syscallnames,
108 .sv_schedtail = NULL,
109 };
110 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
111
112 static Elf32_Brandinfo freebsd_brand_info = {
113 .brand = ELFOSABI_FREEBSD,
114 .machine = EM_MIPS,
115 .compat_3_brand = "FreeBSD",
116 .emul_path = NULL,
117 .interp_path = "/libexec/ld-elf.so.1",
118 .sysvec = &elf32_freebsd_sysvec,
119 .interp_newpath = "/libexec/ld-elf32.so.1",
120 .flags = 0
121 };
122
123 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
124 (sysinit_cfunc_t) elf32_insert_brand_entry,
125 &freebsd_brand_info);
126
127 static void
128 freebsd32_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
129 {
130 exec_setregs(td, imgp, stack);
131
132 /*
133 * See comment in exec_setregs about running 32-bit binaries with 64-bit
134 * registers.
135 */
136 td->td_frame->sp -= 65536;
137
138 /*
139 * Clear extended address space bit for userland.
140 */
141 td->td_frame->sr &= ~MIPS_SR_UX;
142 }
143
144 int
145 set_regs32(struct thread *td, struct reg32 *regs)
146 {
147 struct reg r;
148 unsigned i;
149
150 for (i = 0; i < NUMSAVEREGS; i++)
151 r.r_regs[i] = regs->r_regs[i];
152
153 return (set_regs(td, &r));
154 }
155
156 int
157 fill_regs32(struct thread *td, struct reg32 *regs)
158 {
159 struct reg r;
160 unsigned i;
161 int error;
162
163 error = fill_regs(td, &r);
164 if (error != 0)
165 return (error);
166
167 for (i = 0; i < NUMSAVEREGS; i++)
168 regs->r_regs[i] = r.r_regs[i];
169
170 return (0);
171 }
172
173 int
174 set_fpregs32(struct thread *td, struct fpreg32 *fpregs)
175 {
176 struct fpreg fp;
177 unsigned i;
178
179 for (i = 0; i < NUMFPREGS; i++)
180 fp.r_regs[i] = fpregs->r_regs[i];
181
182 return (set_fpregs(td, &fp));
183 }
184
185 int
186 fill_fpregs32(struct thread *td, struct fpreg32 *fpregs)
187 {
188 struct fpreg fp;
189 unsigned i;
190 int error;
191
192 error = fill_fpregs(td, &fp);
193 if (error != 0)
194 return (error);
195
196 for (i = 0; i < NUMFPREGS; i++)
197 fpregs->r_regs[i] = fp.r_regs[i];
198
199 return (0);
200 }
201
202 static int
203 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags)
204 {
205 mcontext_t mcp64;
206 unsigned i;
207 int error;
208
209 error = get_mcontext(td, &mcp64, flags);
210 if (error != 0)
211 return (error);
212
213 mcp->mc_onstack = mcp64.mc_onstack;
214 mcp->mc_pc = mcp64.mc_pc;
215 for (i = 0; i < 32; i++)
216 mcp->mc_regs[i] = mcp64.mc_regs[i];
217 mcp->sr = mcp64.sr;
218 mcp->mullo = mcp64.mullo;
219 mcp->mulhi = mcp64.mulhi;
220 mcp->mc_fpused = mcp64.mc_fpused;
221 for (i = 0; i < 33; i++)
222 mcp->mc_fpregs[i] = mcp64.mc_fpregs[i];
223 mcp->mc_fpc_eir = mcp64.mc_fpc_eir;
224 mcp->mc_tls = (int32_t)(intptr_t)mcp64.mc_tls;
225
226 return (0);
227 }
228
229 static int
230 set_mcontext32(struct thread *td, const mcontext32_t *mcp)
231 {
232 mcontext_t mcp64;
233 unsigned i;
234
235 mcp64.mc_onstack = mcp->mc_onstack;
236 mcp64.mc_pc = mcp->mc_pc;
237 for (i = 0; i < 32; i++)
238 mcp64.mc_regs[i] = mcp->mc_regs[i];
239 mcp64.sr = mcp->sr;
240 mcp64.mullo = mcp->mullo;
241 mcp64.mulhi = mcp->mulhi;
242 mcp64.mc_fpused = mcp->mc_fpused;
243 for (i = 0; i < 33; i++)
244 mcp64.mc_fpregs[i] = mcp->mc_fpregs[i];
245 mcp64.mc_fpc_eir = mcp->mc_fpc_eir;
246 mcp64.mc_tls = (void *)(intptr_t)mcp->mc_tls;
247
248 return (set_mcontext(td, &mcp64));
249 }
250
251 int
252 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
253 {
254 ucontext32_t uc;
255 int error;
256
257 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp);
258
259 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) {
260 CTR1(KTR_SIG, "sigreturn: efault td=%p", td);
261 return (EFAULT);
262 }
263
264 error = set_mcontext32(td, &uc.uc_mcontext);
265 if (error != 0)
266 return (error);
267
268 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
269
270 #if 0
271 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x",
272 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]);
273 #endif
274
275 return (EJUSTRETURN);
276 }
277
278 /*
279 * The first two fields of a ucontext_t are the signal mask and the machine
280 * context. The next field is uc_link; we want to avoid destroying the link
281 * when copying out contexts.
282 */
283 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link)
284
285 int
286 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
287 {
288 ucontext32_t uc;
289 int ret;
290
291 if (uap->ucp == NULL)
292 ret = EINVAL;
293 else {
294 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
295 PROC_LOCK(td->td_proc);
296 uc.uc_sigmask = td->td_sigmask;
297 PROC_UNLOCK(td->td_proc);
298 ret = copyout(&uc, uap->ucp, UC32_COPY_SIZE);
299 }
300 return (ret);
301 }
302
303 int
304 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
305 {
306 ucontext32_t uc;
307 int ret;
308
309 if (uap->ucp == NULL)
310 ret = EINVAL;
311 else {
312 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
313 if (ret == 0) {
314 ret = set_mcontext32(td, &uc.uc_mcontext);
315 if (ret == 0) {
316 kern_sigprocmask(td, SIG_SETMASK,
317 &uc.uc_sigmask, NULL, 0);
318 }
319 }
320 }
321 return (ret == 0 ? EJUSTRETURN : ret);
322 }
323
324 int
325 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
326 {
327 ucontext32_t uc;
328 int ret;
329
330 if (uap->oucp == NULL || uap->ucp == NULL)
331 ret = EINVAL;
332 else {
333 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
334 PROC_LOCK(td->td_proc);
335 uc.uc_sigmask = td->td_sigmask;
336 PROC_UNLOCK(td->td_proc);
337 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE);
338 if (ret == 0) {
339 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
340 if (ret == 0) {
341 ret = set_mcontext32(td, &uc.uc_mcontext);
342 if (ret == 0) {
343 kern_sigprocmask(td, SIG_SETMASK,
344 &uc.uc_sigmask, NULL, 0);
345 }
346 }
347 }
348 }
349 return (ret == 0 ? EJUSTRETURN : ret);
350 }
351
352 #define UCONTEXT_MAGIC 0xACEDBADE
353
354 /*
355 * Send an interrupt to process.
356 *
357 * Stack is set up to allow sigcode stored
358 * at top to call routine, followed by kcall
359 * to sigreturn routine below. After sigreturn
360 * resets the signal mask, the stack, and the
361 * frame pointer, it returns to the user
362 * specified pc, psl.
363 */
364 static void
365 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
366 {
367 struct proc *p;
368 struct thread *td;
369 struct fpreg32 fpregs;
370 struct reg32 regs;
371 struct sigacts *psp;
372 struct sigframe32 sf, *sfp;
373 int sig;
374 int oonstack;
375 unsigned i;
376
377 td = curthread;
378 p = td->td_proc;
379 PROC_LOCK_ASSERT(p, MA_OWNED);
380 sig = ksi->ksi_signo;
381 psp = p->p_sigacts;
382 mtx_assert(&psp->ps_mtx, MA_OWNED);
383
384 fill_regs32(td, ®s);
385 oonstack = sigonstack(td->td_frame->sp);
386
387 /* save user context */
388 bzero(&sf, sizeof sf);
389 sf.sf_uc.uc_sigmask = *mask;
390 sf.sf_uc.uc_stack.ss_sp = (int32_t)(intptr_t)td->td_sigstk.ss_sp;
391 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
392 sf.sf_uc.uc_stack.ss_flags = td->td_sigstk.ss_flags;
393 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
394 sf.sf_uc.uc_mcontext.mc_pc = regs.r_regs[PC];
395 sf.sf_uc.uc_mcontext.mullo = regs.r_regs[MULLO];
396 sf.sf_uc.uc_mcontext.mulhi = regs.r_regs[MULHI];
397 sf.sf_uc.uc_mcontext.mc_tls = (int32_t)(intptr_t)td->td_md.md_tls;
398 sf.sf_uc.uc_mcontext.mc_regs[0] = UCONTEXT_MAGIC; /* magic number */
399 for (i = 1; i < 32; i++)
400 sf.sf_uc.uc_mcontext.mc_regs[i] = regs.r_regs[i];
401 sf.sf_uc.uc_mcontext.mc_fpused = td->td_md.md_flags & MDTD_FPUSED;
402 if (sf.sf_uc.uc_mcontext.mc_fpused) {
403 /* if FPU has current state, save it first */
404 if (td == PCPU_GET(fpcurthread))
405 MipsSaveCurFPState(td);
406 fill_fpregs32(td, &fpregs);
407 for (i = 0; i < 33; i++)
408 sf.sf_uc.uc_mcontext.mc_fpregs[i] = fpregs.r_regs[i];
409 }
410
411 /* Allocate and validate space for the signal handler context. */
412 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
413 SIGISMEMBER(psp->ps_sigonstack, sig)) {
414 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_sigstk.ss_sp +
415 td->td_sigstk.ss_size - sizeof(struct sigframe32))
416 & ~(sizeof(__int64_t) - 1));
417 } else
418 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_frame->sp -
419 sizeof(struct sigframe32)) & ~(sizeof(__int64_t) - 1));
420
421 /* Translate the signal if appropriate */
422 if (p->p_sysent->sv_sigtbl) {
423 if (sig <= p->p_sysent->sv_sigsize)
424 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
425 }
426
427 /* Build the argument list for the signal handler. */
428 td->td_frame->a0 = sig;
429 td->td_frame->a2 = (register_t)(intptr_t)&sfp->sf_uc;
430 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
431 /* Signal handler installed with SA_SIGINFO. */
432 td->td_frame->a1 = (register_t)(intptr_t)&sfp->sf_si;
433 /* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */
434
435 /* fill siginfo structure */
436 sf.sf_si.si_signo = sig;
437 sf.sf_si.si_code = ksi->ksi_code;
438 sf.sf_si.si_addr = td->td_frame->badvaddr;
439 } else {
440 /* Old FreeBSD-style arguments. */
441 td->td_frame->a1 = ksi->ksi_code;
442 td->td_frame->a3 = td->td_frame->badvaddr;
443 /* sf.sf_ahu.sf_handler = catcher; */
444 }
445
446 mtx_unlock(&psp->ps_mtx);
447 PROC_UNLOCK(p);
448
449 /*
450 * Copy the sigframe out to the user's stack.
451 */
452 if (copyout(&sf, sfp, sizeof(struct sigframe32)) != 0) {
453 /*
454 * Something is wrong with the stack pointer.
455 * ...Kill the process.
456 */
457 PROC_LOCK(p);
458 sigexit(td, SIGILL);
459 }
460
461 td->td_frame->pc = (register_t)(intptr_t)catcher;
462 td->td_frame->t9 = (register_t)(intptr_t)catcher;
463 td->td_frame->sp = (register_t)(intptr_t)sfp;
464 /*
465 * Signal trampoline code is at base of user stack.
466 */
467 td->td_frame->ra = (register_t)(intptr_t)FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode);
468 PROC_LOCK(p);
469 mtx_lock(&psp->ps_mtx);
470 }
471
472 int
473 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap)
474 {
475 int error;
476 int32_t tlsbase;
477
478 switch (uap->op) {
479 case MIPS_SET_TLS:
480 td->td_md.md_tls = (void *)(intptr_t)uap->parms;
481 return (0);
482 case MIPS_GET_TLS:
483 tlsbase = (int32_t)(intptr_t)td->td_md.md_tls;
484 error = copyout(&tlsbase, uap->parms, sizeof(tlsbase));
485 return (error);
486 default:
487 break;
488 }
489 return (EINVAL);
490 }
491
492 void
493 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
494 size_t *off __unused)
495 {
496 }
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