sys/amd64/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/pmap.h>
  40 #include <machine/vmparam.h>
  41
  42 #include <compat/cloudabi/cloudabi_util.h>
  43
  44 #include <compat/cloudabi64/cloudabi64_syscall.h>
  45 #include <compat/cloudabi64/cloudabi64_util.h>
  46
  47 extern const char *cloudabi64_syscallnames[];
  48 extern struct sysent cloudabi64_sysent[];
  49
  50 static int
  51 cloudabi64_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
  52 {
  53         struct trapframe *frame = td->td_frame;
  54
  55         /* Obtain system call number. */
  56         sa->code = frame->tf_rax;
  57         if (sa->code >= CLOUDABI64_SYS_MAXSYSCALL)
  58                 return (ENOSYS);
  59         sa->callp = &cloudabi64_sysent[sa->code];
  60
  61         /* Fetch system call arguments. */
  62         sa->args[0] = frame->tf_rdi;
  63         sa->args[1] = frame->tf_rsi;
  64         sa->args[2] = frame->tf_rdx;
  65         sa->args[3] = frame->tf_rcx; /* Actually %r10. */
  66         sa->args[4] = frame->tf_r8;
  67         sa->args[5] = frame->tf_r9;
  68
  69         /* Default system call return values. */
  70         td->td_retval[0] = 0;
  71         td->td_retval[1] = frame->tf_rdx;
  72         return (0);
  73 }
  74
  75 static void
  76 cloudabi64_set_syscall_retval(struct thread *td, int error)
  77 {
  78         struct trapframe *frame = td->td_frame;
  79
  80         switch (error) {
  81         case 0:
  82                 /* System call succeeded. */
  83                 frame->tf_rax = td->td_retval[0];
  84                 frame->tf_rdx = td->td_retval[1];
  85                 frame->tf_rflags &= ~PSL_C;
  86                 break;
  87         case ERESTART:
  88                 /* Restart system call. */
  89                 frame->tf_rip -= frame->tf_err;
  90                 frame->tf_r10 = frame->tf_rcx;
  91                 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  92                 break;
  93         case EJUSTRETURN:
  94                 break;
  95         default:
  96                 /* System call returned an error. */
  97                 frame->tf_rax = cloudabi_convert_errno(error);
  98                 frame->tf_rflags |= PSL_C;
  99                 break;
 100         }
 101 }
 102
 103 static void
 104 cloudabi64_schedtail(struct thread *td)
 105 {
 106         struct trapframe *frame = td->td_frame;
 107
 108         /* Initial register values for processes returning from fork. */
 109         frame->tf_rax = CLOUDABI_PROCESS_CHILD;
 110         frame->tf_rdx = td->td_tid;
 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_rdi = td->td_tid;
 132         frame->tf_rsi = 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,
 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_X86_64,
 159         .sysvec         = &cloudabi64_elf_sysvec,
 160         .compat_3_brand = "CloudABI",
 161 };