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/i386/cloudabi32/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/11.1/sys/i386/cloudabi32/cloudabi32_sysvec.c 316576 2017-04-06 15:19:18Z kib $");
   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 int
   51 cloudabi32_fixup_tcb(register_t **stack_base, struct image_params *imgp)
   52 {
   53         int error;
   54         uint32_t args[2];
   55 
   56         /* Place auxiliary vector and TCB on the stack. */
   57         error = cloudabi32_fixup(stack_base, imgp);
   58         if (error != 0)
   59                 return (error);
   60 
   61         /*
   62          * On i386, the TCB is referred to by %gs:0. Reuse the empty
   63          * space normally used by the return address (args[0]) to store
   64          * a single element array, containing a pointer to the TCB. %gs
   65          * base will point to this.
   66          *
   67          * Also let the first argument of the entry point (args[1])
   68          * refer to the auxiliary vector, which is stored right after
   69          * the TCB.
   70          */
   71         args[0] = (uintptr_t)*stack_base;
   72         args[1] = (uintptr_t)*stack_base +
   73             roundup(sizeof(cloudabi32_tcb_t), sizeof(register_t));
   74         *stack_base -= howmany(sizeof(args), sizeof(register_t));
   75         return (copyout(args, *stack_base, sizeof(args)));
   76 }
   77 
   78 static void
   79 cloudabi32_proc_setregs(struct thread *td, struct image_params *imgp,
   80     unsigned long stack)
   81 {
   82 
   83         exec_setregs(td, imgp, stack);
   84         (void)cpu_set_user_tls(td, (void *)stack);
   85 }
   86 
   87 static int
   88 cloudabi32_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
   89 {
   90         struct trapframe *frame = td->td_frame;
   91         int error;
   92 
   93         /* Obtain system call number. */
   94         sa->code = frame->tf_eax;
   95         if (sa->code >= CLOUDABI32_SYS_MAXSYSCALL)
   96                 return (ENOSYS);
   97         sa->callp = &cloudabi32_sysent[sa->code];
   98         sa->narg = sa->callp->sy_narg;
   99 
  100         /* Fetch system call arguments from the stack. */
  101         error = copyin((void *)(frame->tf_esp + 4), sa->args,
  102             sa->narg * sizeof(sa->args[0]));
  103         if (error != 0)
  104                 return (error);
  105 
  106         /* Default system call return values. */
  107         td->td_retval[0] = 0;
  108         td->td_retval[1] = frame->tf_edx;
  109         return (0);
  110 }
  111 
  112 static void
  113 cloudabi32_set_syscall_retval(struct thread *td, int error)
  114 {
  115         struct trapframe *frame = td->td_frame;
  116 
  117         switch (error) {
  118         case 0:
  119                 /* System call succeeded. */
  120                 frame->tf_eax = td->td_retval[0];
  121                 frame->tf_edx = td->td_retval[1];
  122                 frame->tf_eflags &= ~PSL_C;
  123                 break;
  124         case ERESTART:
  125                 /* Restart system call. */
  126                 frame->tf_eip -= frame->tf_err;
  127                 break;
  128         case EJUSTRETURN:
  129                 break;
  130         default:
  131                 /* System call returned an error. */
  132                 frame->tf_eax = cloudabi_convert_errno(error);
  133                 frame->tf_eflags |= PSL_C;
  134                 break;
  135         }
  136 }
  137 
  138 static void
  139 cloudabi32_schedtail(struct thread *td)
  140 {
  141         struct trapframe *frame = td->td_frame;
  142 
  143         /* Initial register values for processes returning from fork. */
  144         frame->tf_eax = CLOUDABI_PROCESS_CHILD;
  145         frame->tf_edx = td->td_tid;
  146 }
  147 
  148 int
  149 cloudabi32_thread_setregs(struct thread *td,
  150     const cloudabi32_threadattr_t *attr, uint32_t tcb)
  151 {
  152         stack_t stack;
  153         uint32_t args[3];
  154         void *frameptr;
  155         int error;
  156 
  157         /* Perform standard register initialization. */
  158         stack.ss_sp = TO_PTR(attr->stack);
  159         stack.ss_size = attr->stack_len - sizeof(args);
  160         cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack);
  161 
  162         /*
  163          * Copy the arguments for the thread entry point onto the stack
  164          * (args[1] and args[2]). Similar to process startup, use the
  165          * otherwise unused return address (args[0]) for TLS.
  166          */
  167         args[0] = tcb;
  168         args[1] = td->td_tid;
  169         args[2] = attr->argument;
  170         frameptr = (void *)td->td_frame->tf_esp;
  171         error = copyout(args, frameptr, sizeof(args));
  172         if (error != 0)
  173                 return (error);
  174 
  175         return (cpu_set_user_tls(td, frameptr));
  176 }
  177 
  178 static struct sysentvec cloudabi32_elf_sysvec = {
  179         .sv_size                = CLOUDABI32_SYS_MAXSYSCALL,
  180         .sv_table               = cloudabi32_sysent,
  181         .sv_fixup               = cloudabi32_fixup_tcb,
  182         .sv_name                = "CloudABI ELF32",
  183         .sv_coredump            = elf32_coredump,
  184         .sv_pagesize            = PAGE_SIZE,
  185         .sv_minuser             = VM_MIN_ADDRESS,
  186         .sv_maxuser             = VM_MAXUSER_ADDRESS,
  187         .sv_stackprot           = VM_PROT_READ | VM_PROT_WRITE,
  188         .sv_copyout_strings     = cloudabi32_copyout_strings,
  189         .sv_setregs             = cloudabi32_proc_setregs,
  190         .sv_flags               = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_IA32 | SV_ILP32,
  191         .sv_set_syscall_retval  = cloudabi32_set_syscall_retval,
  192         .sv_fetch_syscall_args  = cloudabi32_fetch_syscall_args,
  193         .sv_syscallnames        = cloudabi32_syscallnames,
  194         .sv_schedtail           = cloudabi32_schedtail,
  195 };
  196 
  197 INIT_SYSENTVEC(elf_sysvec, &cloudabi32_elf_sysvec);
  198 
  199 Elf32_Brandinfo cloudabi32_brand = {
  200         .brand          = ELFOSABI_CLOUDABI,
  201         .machine        = EM_386,
  202         .sysvec         = &cloudabi32_elf_sysvec,
  203         .flags          = BI_BRAND_ONLY_STATIC,
  204 };

Cache object: a8813e81ac6f990d751b6638326a6dfc


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