sys/arm64/cloudabi64/cloudabi64_sysvec.c

   1 /*-
   2  * Copyright (c) 2015 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("$FreeBSD$");
  28
  29 #include <sys/param.h>
  30 #include <sys/kernel.h>
  31 #include <sys/proc.h>
  32 #include <sys/sysent.h>
  33
  34 #include <vm/vm.h>
  35 #include <vm/pmap.h>
  36
  37 #include <machine/frame.h>
  38 #include <machine/pcb.h>
  39 #include <machine/vmparam.h>
  40
  41 #include <compat/cloudabi/cloudabi_util.h>
  42
  43 #include <compat/cloudabi64/cloudabi64_syscall.h>
  44 #include <compat/cloudabi64/cloudabi64_util.h>
  45
  46 extern const char *cloudabi64_syscallnames[];
  47 extern struct sysent cloudabi64_sysent[];
  48
  49 static int
  50 cloudabi64_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
  51 {
  52         struct trapframe *frame = td->td_frame;
  53         int i;
  54
  55         /* Obtain system call number. */
  56         sa->code = frame->tf_x[8];
  57         if (sa->code >= CLOUDABI64_SYS_MAXSYSCALL)
  58                 return (ENOSYS);
  59         sa->callp = &cloudabi64_sysent[sa->code];
  60
  61         /* Fetch system call arguments. */
  62         for (i = 0; i < MAXARGS; i++)
  63                 sa->args[i] = frame->tf_x[i];
  64
  65         /* Default system call return values. */
  66         td->td_retval[0] = 0;
  67         td->td_retval[1] = frame->tf_x[1];
  68         return (0);
  69 }
  70
  71 static void
  72 cloudabi64_set_syscall_retval(struct thread *td, int error)
  73 {
  74         struct trapframe *frame = td->td_frame;
  75
  76         switch (error) {
  77         case 0:
  78                 /* System call succeeded. */
  79                 frame->tf_x[0] = td->td_retval[0];
  80                 frame->tf_x[1] = td->td_retval[1];
  81                 frame->tf_spsr &= ~PSR_C;
  82                 break;
  83         case ERESTART:
  84                 /* Restart system call. */
  85                 frame->tf_elr -= 4;
  86                 break;
  87         case EJUSTRETURN:
  88                 break;
  89         default:
  90                 /* System call returned an error. */
  91                 frame->tf_x[0] = cloudabi_convert_errno(error);
  92                 frame->tf_spsr |= PSR_C;
  93                 break;
  94         }
  95 }
  96
  97 static void
  98 cloudabi64_schedtail(struct thread *td)
  99 {
 100         struct trapframe *frame = td->td_frame;
 101
 102         /*
 103          * Initial register values for processes returning from fork.
 104          * Make sure that we only set these values when forking, not
 105          * when creating a new thread.
 106          */
 107         if ((td->td_pflags & TDP_FORKING) != 0) {
 108                 frame->tf_x[0] = CLOUDABI_PROCESS_CHILD;
 109                 frame->tf_x[1] = td->td_tid;
 110         }
 111 }
 112
 113 void
 114 cloudabi64_thread_setregs(struct thread *td,
 115     const cloudabi64_threadattr_t *attr)
 116 {
 117         struct trapframe *frame;
 118         stack_t stack;
 119
 120         /* Perform standard register initialization. */
 121         stack.ss_sp = (void *)attr->stack;
 122         stack.ss_size = attr->stack_size;
 123         cpu_set_upcall_kse(td, (void *)attr->entry_point, NULL, &stack);
 124
 125         /*
 126          * Pass in the thread ID of the new thread and the argument
 127          * pointer provided by the parent thread in as arguments to the
 128          * entry point.
 129          */
 130         frame = td->td_frame;
 131         frame->tf_x[0] = td->td_tid;
 132         frame->tf_x[1] = attr->argument;
 133 }
 134
 135 static struct sysentvec cloudabi64_elf_sysvec = {
 136         .sv_size                = CLOUDABI64_SYS_MAXSYSCALL,
 137         .sv_table               = cloudabi64_sysent,
 138         .sv_fixup               = cloudabi64_fixup,
 139         .sv_name                = "CloudABI ELF64",
 140         .sv_coredump            = elf64_coredump,
 141         .sv_pagesize            = PAGE_SIZE,
 142         .sv_minuser             = VM_MIN_ADDRESS,
 143         .sv_maxuser             = VM_MAXUSER_ADDRESS,
 144         .sv_usrstack            = USRSTACK,
 145         .sv_stackprot           = VM_PROT_READ | VM_PROT_WRITE,
 146         .sv_copyout_strings     = cloudabi64_copyout_strings,
 147         .sv_flags               = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_LP64,
 148         .sv_set_syscall_retval  = cloudabi64_set_syscall_retval,
 149         .sv_fetch_syscall_args  = cloudabi64_fetch_syscall_args,
 150         .sv_syscallnames        = cloudabi64_syscallnames,
 151         .sv_schedtail           = cloudabi64_schedtail,
 152 };
 153
 154 INIT_SYSENTVEC(elf_sysvec, &cloudabi64_elf_sysvec);
 155
 156 Elf64_Brandinfo cloudabi64_brand = {
 157         .brand          = ELFOSABI_CLOUDABI,
 158         .machine        = EM_AARCH64,
 159         .sysvec         = &cloudabi64_elf_sysvec,
 160         .flags          = BI_CAN_EXEC_DYN,
 161         .compat_3_brand = "CloudABI",
 162 };