cloudabi32_sysvec.c

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    1 /*-
    2  * Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/11.2/sys/arm/cloudabi32/cloudabi32_sysvec.c 326743 2017-12-10 12:25:32Z ed $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/imgact.h>
   31 #include <sys/kernel.h>
   32 #include <sys/proc.h>
   33 #include <sys/sysent.h>
   34 
   35 #include <vm/vm.h>
   36 #include <vm/pmap.h>
   37 
   38 #include <machine/frame.h>
   39 #include <machine/pcb.h>
   40 #include <machine/vmparam.h>
   41 
   42 #include <compat/cloudabi/cloudabi_util.h>
   43 
   44 #include <compat/cloudabi32/cloudabi32_syscall.h>
   45 #include <compat/cloudabi32/cloudabi32_util.h>
   46 
   47 extern const char *cloudabi32_syscallnames[];
   48 extern struct sysent cloudabi32_sysent[];
   49 
   50 static void
   51 cloudabi32_proc_setregs(struct thread *td, struct image_params *imgp,
   52     unsigned long stack)
   53 {
   54         struct trapframe *regs;
   55 
   56         exec_setregs(td, imgp, stack);
   57 
   58         /*
   59          * The stack now contains a pointer to the TCB and the auxiliary
   60          * vector. Let r0 point to the auxiliary vector, and set
   61          * tpidrurw to the TCB.
   62          */
   63         regs = td->td_frame;
   64         regs->tf_r0 = td->td_retval[0] =
   65             stack + roundup(sizeof(cloudabi32_tcb_t), sizeof(register_t));
   66         (void)cpu_set_user_tls(td, TO_PTR(stack));
   67 }
   68 
   69 static int
   70 cloudabi32_fetch_syscall_args(struct thread *td)
   71 {
   72         struct trapframe *frame;
   73         struct syscall_args *sa;
   74         int error;
   75 
   76         frame = td->td_frame;
   77         sa = &td->td_sa;
   78 
   79         /* Obtain system call number. */
   80         sa->code = frame->tf_r12;
   81         if (sa->code >= CLOUDABI32_SYS_MAXSYSCALL)
   82                 return (ENOSYS);
   83         sa->callp = &cloudabi32_sysent[sa->code];
   84         sa->narg = sa->callp->sy_narg;
   85 
   86         /* Fetch system call arguments from registers and the stack. */
   87         sa->args[0] = frame->tf_r0;
   88         sa->args[1] = frame->tf_r1;
   89         sa->args[2] = frame->tf_r2;
   90         sa->args[3] = frame->tf_r3;
   91         if (sa->narg > 4) {
   92                 error = copyin((void *)td->td_frame->tf_usr_sp, &sa->args[4],
   93                     (sa->narg - 4) * sizeof(register_t));
   94                 if (error != 0)
   95                         return (error);
   96         }
   97 
   98         /* Default system call return values. */
   99         td->td_retval[0] = 0;
  100         td->td_retval[1] = frame->tf_r1;
  101         return (0);
  102 }
  103 
  104 static void
  105 cloudabi32_set_syscall_retval(struct thread *td, int error)
  106 {
  107         struct trapframe *frame = td->td_frame;
  108 
  109         switch (error) {
  110         case 0:
  111                 /* System call succeeded. */
  112                 frame->tf_r0 = td->td_retval[0];
  113                 frame->tf_r1 = td->td_retval[1];
  114                 frame->tf_spsr &= ~PSR_C;
  115                 break;
  116         case ERESTART:
  117                 /* Restart system call. */
  118                 frame->tf_pc -= 4;
  119                 break;
  120         case EJUSTRETURN:
  121                 break;
  122         default:
  123                 /* System call returned an error. */
  124                 frame->tf_r0 = cloudabi_convert_errno(error);
  125                 frame->tf_spsr |= PSR_C;
  126                 break;
  127         }
  128 }
  129 
  130 static void
  131 cloudabi32_schedtail(struct thread *td)
  132 {
  133         struct trapframe *frame = td->td_frame;
  134 
  135         /*
  136          * Initial register values for processes returning from fork.
  137          * Make sure that we only set these values when forking, not
  138          * when creating a new thread.
  139          */
  140         if ((td->td_pflags & TDP_FORKING) != 0) {
  141                 frame->tf_r0 = CLOUDABI_PROCESS_CHILD;
  142                 frame->tf_r1 = td->td_tid;
  143         }
  144 }
  145 
  146 int
  147 cloudabi32_thread_setregs(struct thread *td,
  148     const cloudabi32_threadattr_t *attr, uint32_t tcb)
  149 {
  150         struct trapframe *frame;
  151         stack_t stack;
  152 
  153         /* Perform standard register initialization. */
  154         stack.ss_sp = TO_PTR(attr->stack);
  155         stack.ss_size = attr->stack_len;
  156         cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack);
  157 
  158         /*
  159          * Pass in the thread ID of the new thread and the argument
  160          * pointer provided by the parent thread in as arguments to the
  161          * entry point.
  162          */
  163         frame = td->td_frame;
  164         frame->tf_r0 = td->td_tid;
  165         frame->tf_r1 = attr->argument;
  166 
  167         /* Set up TLS. */
  168         return (cpu_set_user_tls(td, TO_PTR(tcb)));
  169 }
  170 
  171 static struct sysentvec cloudabi32_elf_sysvec = {
  172         .sv_size                = CLOUDABI32_SYS_MAXSYSCALL,
  173         .sv_table               = cloudabi32_sysent,
  174         .sv_fixup               = cloudabi32_fixup,
  175         .sv_name                = "CloudABI ELF32",
  176         .sv_coredump            = elf32_coredump,
  177         .sv_pagesize            = PAGE_SIZE,
  178         .sv_minuser             = VM_MIN_ADDRESS,
  179         .sv_maxuser             = VM_MAXUSER_ADDRESS,
  180         .sv_stackprot           = VM_PROT_READ | VM_PROT_WRITE,
  181         .sv_copyout_strings     = cloudabi32_copyout_strings,
  182         .sv_setregs             = cloudabi32_proc_setregs,
  183         .sv_flags               = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_ILP32,
  184         .sv_set_syscall_retval  = cloudabi32_set_syscall_retval,
  185         .sv_fetch_syscall_args  = cloudabi32_fetch_syscall_args,
  186         .sv_syscallnames        = cloudabi32_syscallnames,
  187         .sv_schedtail           = cloudabi32_schedtail,
  188 };
  189 
  190 INIT_SYSENTVEC(elf_sysvec, &cloudabi32_elf_sysvec);
  191 
  192 Elf32_Brandinfo cloudabi32_brand = {
  193         .brand          = ELFOSABI_CLOUDABI,
  194         .machine        = EM_ARM,
  195         .sysvec         = &cloudabi32_elf_sysvec,
  196         .flags          = BI_BRAND_ONLY_STATIC,
  197 };

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FreeBSD/Linux Kernel Cross Reference sys/arm/cloudabi32/cloudabi32_sysvec.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/cloudabi32/cloudabi32_sysvec.c