2 * Copyright (c) 2012 Juli Mallett <jmallett@FreeBSD.org>
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
30 * Based on nwhitehorn's COMPAT_FREEBSD32 support code for PowerPC64.
33 #include "opt_compat.h"
35 #define __ELF_WORD_SIZE 32
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>
43 #include <sys/imgact.h>
44 #include <sys/malloc.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>
58 #include <vm/vm_param.h>
60 #include <machine/md_var.h>
61 #include <machine/reg.h>
62 #include <machine/sigframe.h>
63 #include <machine/sysarch.h>
64 #include <machine/tls.h>
66 #include <compat/freebsd32/freebsd32_signal.h>
67 #include <compat/freebsd32/freebsd32_util.h>
68 #include <compat/freebsd32/freebsd32_proto.h>
70 static void freebsd32_exec_setregs(struct thread *, struct image_params *, u_long);
71 static int get_mcontext32(struct thread *, mcontext32_t *, int);
72 static int set_mcontext32(struct thread *, mcontext32_t *);
73 static void freebsd32_sendsig(sig_t, ksiginfo_t *, sigset_t *);
75 extern const char *freebsd32_syscallnames[];
77 struct sysentvec elf32_freebsd_sysvec = {
78 .sv_size = SYS_MAXSYSCALL,
79 .sv_table = freebsd32_sysent,
84 .sv_fixup = __elfN(freebsd_fixup),
85 .sv_sendsig = freebsd32_sendsig,
86 .sv_sigcode = sigcode32,
87 .sv_szsigcode = &szsigcode32,
88 .sv_name = "FreeBSD ELF32",
89 .sv_coredump = __elfN(coredump),
90 .sv_imgact_try = NULL,
91 .sv_minsigstksz = MINSIGSTKSZ,
92 .sv_pagesize = PAGE_SIZE,
93 .sv_minuser = VM_MIN_ADDRESS,
94 .sv_maxuser = ((vm_offset_t)0x80000000),
95 .sv_usrstack = FREEBSD32_USRSTACK,
96 .sv_psstrings = FREEBSD32_PS_STRINGS,
97 .sv_stackprot = VM_PROT_ALL,
98 .sv_copyout_strings = freebsd32_copyout_strings,
99 .sv_setregs = freebsd32_exec_setregs,
102 .sv_flags = SV_ABI_FREEBSD | SV_ILP32,
103 .sv_set_syscall_retval = cpu_set_syscall_retval,
104 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
105 .sv_syscallnames = freebsd32_syscallnames,
106 .sv_schedtail = NULL,
107 .sv_thread_detach = NULL,
110 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
112 static Elf32_Brandinfo freebsd_brand_info = {
113 .brand = ELFOSABI_FREEBSD,
115 .compat_3_brand = "FreeBSD",
117 .interp_path = "/libexec/ld-elf.so.1",
118 .sysvec = &elf32_freebsd_sysvec,
119 .interp_newpath = "/libexec/ld-elf32.so.1",
120 .brand_note = &elf32_freebsd_brandnote,
121 .flags = BI_BRAND_NOTE
124 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
125 (sysinit_cfunc_t) elf32_insert_brand_entry,
126 &freebsd_brand_info);
129 freebsd32_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
131 exec_setregs(td, imgp, stack);
134 * See comment in exec_setregs about running 32-bit binaries with 64-bit
137 td->td_frame->sp -= 65536;
140 * Clear extended address space bit for userland.
142 td->td_frame->sr &= ~MIPS_SR_UX;
144 td->td_md.md_tls_tcb_offset = TLS_TP_OFFSET + TLS_TCB_SIZE32;
148 set_regs32(struct thread *td, struct reg32 *regs)
153 for (i = 0; i < NUMSAVEREGS; i++)
154 r.r_regs[i] = regs->r_regs[i];
156 return (set_regs(td, &r));
160 fill_regs32(struct thread *td, struct reg32 *regs)
166 error = fill_regs(td, &r);
170 for (i = 0; i < NUMSAVEREGS; i++)
171 regs->r_regs[i] = r.r_regs[i];
177 set_fpregs32(struct thread *td, struct fpreg32 *fpregs)
182 for (i = 0; i < NUMFPREGS; i++)
183 fp.r_regs[i] = fpregs->r_regs[i];
185 return (set_fpregs(td, &fp));
189 fill_fpregs32(struct thread *td, struct fpreg32 *fpregs)
195 error = fill_fpregs(td, &fp);
199 for (i = 0; i < NUMFPREGS; i++)
200 fpregs->r_regs[i] = fp.r_regs[i];
206 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags)
212 error = get_mcontext(td, &mcp64, flags);
216 mcp->mc_onstack = mcp64.mc_onstack;
217 mcp->mc_pc = mcp64.mc_pc;
218 for (i = 0; i < 32; i++)
219 mcp->mc_regs[i] = mcp64.mc_regs[i];
221 mcp->mullo = mcp64.mullo;
222 mcp->mulhi = mcp64.mulhi;
223 mcp->mc_fpused = mcp64.mc_fpused;
224 for (i = 0; i < 33; i++)
225 mcp->mc_fpregs[i] = mcp64.mc_fpregs[i];
226 mcp->mc_fpc_eir = mcp64.mc_fpc_eir;
227 mcp->mc_tls = (int32_t)(intptr_t)mcp64.mc_tls;
233 set_mcontext32(struct thread *td, mcontext32_t *mcp)
238 mcp64.mc_onstack = mcp->mc_onstack;
239 mcp64.mc_pc = mcp->mc_pc;
240 for (i = 0; i < 32; i++)
241 mcp64.mc_regs[i] = mcp->mc_regs[i];
243 mcp64.mullo = mcp->mullo;
244 mcp64.mulhi = mcp->mulhi;
245 mcp64.mc_fpused = mcp->mc_fpused;
246 for (i = 0; i < 33; i++)
247 mcp64.mc_fpregs[i] = mcp->mc_fpregs[i];
248 mcp64.mc_fpc_eir = mcp->mc_fpc_eir;
249 mcp64.mc_tls = (void *)(intptr_t)mcp->mc_tls;
251 return (set_mcontext(td, &mcp64));
255 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
260 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp);
262 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) {
263 CTR1(KTR_SIG, "sigreturn: efault td=%p", td);
267 error = set_mcontext32(td, &uc.uc_mcontext);
271 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
274 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x",
275 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]);
278 return (EJUSTRETURN);
282 * The first two fields of a ucontext_t are the signal mask and the machine
283 * context. The next field is uc_link; we want to avoid destroying the link
284 * when copying out contexts.
286 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link)
289 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
294 if (uap->ucp == NULL)
297 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
298 PROC_LOCK(td->td_proc);
299 uc.uc_sigmask = td->td_sigmask;
300 PROC_UNLOCK(td->td_proc);
301 ret = copyout(&uc, uap->ucp, UC32_COPY_SIZE);
307 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
312 if (uap->ucp == NULL)
315 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
317 ret = set_mcontext32(td, &uc.uc_mcontext);
319 kern_sigprocmask(td, SIG_SETMASK,
320 &uc.uc_sigmask, NULL, 0);
324 return (ret == 0 ? EJUSTRETURN : ret);
328 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
333 if (uap->oucp == NULL || uap->ucp == NULL)
336 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
337 PROC_LOCK(td->td_proc);
338 uc.uc_sigmask = td->td_sigmask;
339 PROC_UNLOCK(td->td_proc);
340 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE);
342 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
344 ret = set_mcontext32(td, &uc.uc_mcontext);
346 kern_sigprocmask(td, SIG_SETMASK,
347 &uc.uc_sigmask, NULL, 0);
352 return (ret == 0 ? EJUSTRETURN : ret);
355 #define UCONTEXT_MAGIC 0xACEDBADE
358 * Send an interrupt to process.
360 * Stack is set up to allow sigcode stored
361 * at top to call routine, followed by kcall
362 * to sigreturn routine below. After sigreturn
363 * resets the signal mask, the stack, and the
364 * frame pointer, it returns to the user
368 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
372 struct fpreg32 fpregs;
375 struct sigframe32 sf, *sfp;
382 PROC_LOCK_ASSERT(p, MA_OWNED);
383 sig = ksi->ksi_signo;
385 mtx_assert(&psp->ps_mtx, MA_OWNED);
387 fill_regs32(td, ®s);
388 oonstack = sigonstack(td->td_frame->sp);
390 /* save user context */
391 bzero(&sf, sizeof sf);
392 sf.sf_uc.uc_sigmask = *mask;
393 sf.sf_uc.uc_stack.ss_sp = (int32_t)(intptr_t)td->td_sigstk.ss_sp;
394 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
395 sf.sf_uc.uc_stack.ss_flags = td->td_sigstk.ss_flags;
396 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
397 sf.sf_uc.uc_mcontext.mc_pc = regs.r_regs[PC];
398 sf.sf_uc.uc_mcontext.mullo = regs.r_regs[MULLO];
399 sf.sf_uc.uc_mcontext.mulhi = regs.r_regs[MULHI];
400 sf.sf_uc.uc_mcontext.mc_tls = (int32_t)(intptr_t)td->td_md.md_tls;
401 sf.sf_uc.uc_mcontext.mc_regs[0] = UCONTEXT_MAGIC; /* magic number */
402 for (i = 1; i < 32; i++)
403 sf.sf_uc.uc_mcontext.mc_regs[i] = regs.r_regs[i];
404 sf.sf_uc.uc_mcontext.mc_fpused = td->td_md.md_flags & MDTD_FPUSED;
405 if (sf.sf_uc.uc_mcontext.mc_fpused) {
406 /* if FPU has current state, save it first */
407 if (td == PCPU_GET(fpcurthread))
408 MipsSaveCurFPState(td);
409 fill_fpregs32(td, &fpregs);
410 for (i = 0; i < 33; i++)
411 sf.sf_uc.uc_mcontext.mc_fpregs[i] = fpregs.r_regs[i];
414 /* Allocate and validate space for the signal handler context. */
415 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
416 SIGISMEMBER(psp->ps_sigonstack, sig)) {
417 sfp = (struct sigframe32 *)(((uintptr_t)td->td_sigstk.ss_sp +
418 td->td_sigstk.ss_size - sizeof(struct sigframe32))
419 & ~(sizeof(__int64_t) - 1));
421 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_frame->sp -
422 sizeof(struct sigframe32)) & ~(sizeof(__int64_t) - 1));
424 /* Build the argument list for the signal handler. */
425 td->td_frame->a0 = sig;
426 td->td_frame->a2 = (register_t)(intptr_t)&sfp->sf_uc;
427 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
428 /* Signal handler installed with SA_SIGINFO. */
429 td->td_frame->a1 = (register_t)(intptr_t)&sfp->sf_si;
430 /* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */
432 /* fill siginfo structure */
433 sf.sf_si.si_signo = sig;
434 sf.sf_si.si_code = ksi->ksi_code;
435 sf.sf_si.si_addr = td->td_frame->badvaddr;
437 /* Old FreeBSD-style arguments. */
438 td->td_frame->a1 = ksi->ksi_code;
439 td->td_frame->a3 = td->td_frame->badvaddr;
440 /* sf.sf_ahu.sf_handler = catcher; */
443 mtx_unlock(&psp->ps_mtx);
447 * Copy the sigframe out to the user's stack.
449 if (copyout(&sf, sfp, sizeof(struct sigframe32)) != 0) {
451 * Something is wrong with the stack pointer.
452 * ...Kill the process.
458 td->td_frame->pc = (register_t)(intptr_t)catcher;
459 td->td_frame->t9 = (register_t)(intptr_t)catcher;
460 td->td_frame->sp = (register_t)(intptr_t)sfp;
462 * Signal trampoline code is at base of user stack.
464 td->td_frame->ra = (register_t)(intptr_t)FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode);
466 mtx_lock(&psp->ps_mtx);
470 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap)
477 td->td_md.md_tls = (void *)(intptr_t)uap->parms;
480 tlsbase = (int32_t)(intptr_t)td->td_md.md_tls;
481 error = copyout(&tlsbase, uap->parms, sizeof(tlsbase));
490 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
491 size_t *off __unused)