The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/freebsd32_machdep.c

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    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, &regs);
  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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