cloudabi64_sysvec.c

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    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: releng/12.0/sys/amd64/cloudabi64/cloudabi64_sysvec.c 326228 2017-11-26 14:45:56Z 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/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_fixup_tcb(register_t **stack_base, struct image_params *imgp)
   52 {
   53         int error;
   54         register_t tcbptr;
   55 
   56         /* Place auxiliary vector and TCB on the stack. */
   57         error = cloudabi64_fixup(stack_base, imgp);
   58         if (error != 0)
   59                 return (error);
   60         
   61         /*
   62          * On x86-64, the TCB is referred to by %fs:0. Take some space
   63          * from the top of the stack to store a single element array,
   64          * containing a pointer to the TCB. %fs base will point to this.
   65          */
   66         tcbptr = (register_t)*stack_base;
   67         return (copyout(&tcbptr, --*stack_base, sizeof(tcbptr)));
   68 }
   69 
   70 static void
   71 cloudabi64_proc_setregs(struct thread *td, struct image_params *imgp,
   72     unsigned long stack)
   73 {
   74         struct trapframe *regs;
   75 
   76         exec_setregs(td, imgp, stack);
   77 
   78         /*
   79          * The stack now contains a pointer to the TCB, the TCB itself,
   80          * and the auxiliary vector. Let %rdx point to the auxiliary
   81          * vector, and set %fs base to the address of the TCB.
   82          */
   83         regs = td->td_frame;
   84         regs->tf_rdi = stack + sizeof(register_t) +
   85             roundup(sizeof(cloudabi64_tcb_t), sizeof(register_t));
   86         (void)cpu_set_user_tls(td, TO_PTR(stack));
   87 }
   88 
   89 static int
   90 cloudabi64_fetch_syscall_args(struct thread *td)
   91 {
   92         struct trapframe *frame;
   93         struct syscall_args *sa;
   94 
   95         frame = td->td_frame;
   96         sa = &td->td_sa;
   97 
   98         /* Obtain system call number. */
   99         sa->code = frame->tf_rax;
  100         if (sa->code >= CLOUDABI64_SYS_MAXSYSCALL)
  101                 return (ENOSYS);
  102         sa->callp = &cloudabi64_sysent[sa->code];
  103         sa->narg = sa->callp->sy_narg;
  104 
  105         /* Fetch system call arguments. */
  106         sa->args[0] = frame->tf_rdi;
  107         sa->args[1] = frame->tf_rsi;
  108         sa->args[2] = frame->tf_rdx;
  109         sa->args[3] = frame->tf_rcx; /* Actually %r10. */
  110         sa->args[4] = frame->tf_r8;
  111         sa->args[5] = frame->tf_r9;
  112 
  113         /* Default system call return values. */
  114         td->td_retval[0] = 0;
  115         td->td_retval[1] = frame->tf_rdx;
  116         return (0);
  117 }
  118 
  119 static void
  120 cloudabi64_set_syscall_retval(struct thread *td, int error)
  121 {
  122         struct trapframe *frame = td->td_frame;
  123 
  124         switch (error) {
  125         case 0:
  126                 /* System call succeeded. */
  127                 frame->tf_rax = td->td_retval[0];
  128                 frame->tf_rdx = td->td_retval[1];
  129                 frame->tf_rflags &= ~PSL_C;
  130                 break;
  131         case ERESTART:
  132                 /* Restart system call. */
  133                 frame->tf_rip -= frame->tf_err;
  134                 frame->tf_r10 = frame->tf_rcx;
  135                 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  136                 break;
  137         case EJUSTRETURN:
  138                 break;
  139         default:
  140                 /* System call returned an error. */
  141                 frame->tf_rax = cloudabi_convert_errno(error);
  142                 frame->tf_rflags |= PSL_C;
  143                 break;
  144         }
  145 }
  146 
  147 static void
  148 cloudabi64_schedtail(struct thread *td)
  149 {
  150         struct trapframe *frame = td->td_frame;
  151 
  152         /* Initial register values for processes returning from fork. */
  153         frame->tf_rax = CLOUDABI_PROCESS_CHILD;
  154         frame->tf_rdx = td->td_tid;
  155 }
  156 
  157 int
  158 cloudabi64_thread_setregs(struct thread *td,
  159     const cloudabi64_threadattr_t *attr, uint64_t tcb)
  160 {
  161         struct trapframe *frame;
  162         stack_t stack;
  163         uint64_t tcbptr;
  164         int error;
  165 
  166         /*
  167          * On x86-64, the TCB is referred to by %fs:0. Take some space
  168          * from the top of the stack to store a single element array,
  169          * containing a pointer to the TCB. %fs base will point to this.
  170          */
  171         tcbptr = rounddown(attr->stack + attr->stack_len - sizeof(tcbptr),
  172             _Alignof(tcbptr));
  173         error = copyout(&tcb, (void *)tcbptr, sizeof(tcb));
  174         if (error != 0)
  175                 return (error);
  176 
  177         /* Perform standard register initialization. */
  178         stack.ss_sp = TO_PTR(attr->stack);
  179         stack.ss_size = tcbptr - attr->stack;
  180         cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack);
  181 
  182         /*
  183          * Pass in the thread ID of the new thread and the argument
  184          * pointer provided by the parent thread in as arguments to the
  185          * entry point.
  186          */
  187         frame = td->td_frame;
  188         frame->tf_rdi = td->td_tid;
  189         frame->tf_rsi = attr->argument;
  190 
  191         return (cpu_set_user_tls(td, TO_PTR(tcbptr)));
  192 }
  193 
  194 static struct sysentvec cloudabi64_elf_sysvec = {
  195         .sv_size                = CLOUDABI64_SYS_MAXSYSCALL,
  196         .sv_table               = cloudabi64_sysent,
  197         .sv_fixup               = cloudabi64_fixup_tcb,
  198         .sv_name                = "CloudABI ELF64",
  199         .sv_coredump            = elf64_coredump,
  200         .sv_pagesize            = PAGE_SIZE,
  201         .sv_minuser             = VM_MIN_ADDRESS,
  202         /* Keep top page reserved to work around AMD Ryzen stability issues. */
  203         .sv_maxuser             = VM_MAXUSER_ADDRESS - PAGE_SIZE,
  204         .sv_stackprot           = VM_PROT_READ | VM_PROT_WRITE,
  205         .sv_copyout_strings     = cloudabi64_copyout_strings,
  206         .sv_setregs             = cloudabi64_proc_setregs,
  207         .sv_flags               = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_LP64,
  208         .sv_set_syscall_retval  = cloudabi64_set_syscall_retval,
  209         .sv_fetch_syscall_args  = cloudabi64_fetch_syscall_args,
  210         .sv_syscallnames        = cloudabi64_syscallnames,
  211         .sv_schedtail           = cloudabi64_schedtail,
  212 };
  213 
  214 INIT_SYSENTVEC(elf_sysvec, &cloudabi64_elf_sysvec);
  215 
  216 Elf64_Brandinfo cloudabi64_brand = {
  217         .brand          = ELFOSABI_CLOUDABI,
  218         .machine        = EM_X86_64,
  219         .sysvec         = &cloudabi64_elf_sysvec,
  220         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_ONLY_STATIC,
  221 };

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FreeBSD/Linux Kernel Cross Reference sys/amd64/cloudabi64/cloudabi64_sysvec.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/cloudabi64/cloudabi64_sysvec.c