/*- * Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/ * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern const char *cloudabi32_syscallnames[]; extern struct sysent cloudabi32_sysent[]; extern unsigned long ia32_maxssiz; static int cloudabi32_fixup_tcb(register_t **stack_base, struct image_params *imgp) { int error; uint32_t args[2]; /* Place auxiliary vector and TCB on the stack. */ error = cloudabi32_fixup(stack_base, imgp); if (error != 0) return (error); /* * On i386, the TCB is referred to by %gs:0. Reuse the empty * space normally used by the return address (args[0]) to store * a single element array, containing a pointer to the TCB. %gs * base will point to this. * * Also let the first argument of the entry point (args[1]) * refer to the auxiliary vector, which is stored right after * the TCB. */ args[0] = (uintptr_t)*stack_base; args[1] = (uintptr_t)*stack_base + roundup(sizeof(cloudabi32_tcb_t), sizeof(register_t)); *stack_base -= howmany(sizeof(args), sizeof(register_t)); return (copyout(args, *stack_base, sizeof(args))); } static void cloudabi32_proc_setregs(struct thread *td, struct image_params *imgp, unsigned long stack) { ia32_setregs(td, imgp, stack); (void)cpu_set_user_tls(td, (void *)stack); } static int cloudabi32_fetch_syscall_args(struct thread *td) { struct trapframe *frame; struct syscall_args *sa; int error; frame = td->td_frame; sa = &td->td_sa; /* Obtain system call number. */ sa->code = frame->tf_rax; if (sa->code >= CLOUDABI32_SYS_MAXSYSCALL) return (ENOSYS); sa->callp = &cloudabi32_sysent[sa->code]; sa->narg = sa->callp->sy_narg; /* * Fetch system call arguments. * * The vDSO has already made sure that the arguments are * eight-byte aligned. Pointers and size_t parameters are * zero-extended. This makes it possible to copy in the * arguments directly. As long as the call doesn't use 32-bit * data structures, we can just invoke the same system call * implementation used by 64-bit processes. */ error = copyin((void *)frame->tf_rcx, sa->args, sa->narg * sizeof(sa->args[0])); if (error != 0) return (error); /* Default system call return values. */ td->td_retval[0] = 0; td->td_retval[1] = 0; return (0); } static void cloudabi32_set_syscall_retval(struct thread *td, int error) { struct trapframe *frame = td->td_frame; switch (error) { case 0: /* * System call succeeded. * * Simply copy out the 64-bit return values into the * same buffer provided for system call arguments. The * vDSO will copy them to the right spot, truncating * pointers and size_t values to 32 bits. */ frame->tf_rax = copyout(td->td_retval, (void *)frame->tf_rcx, sizeof(td->td_retval)) == 0 ? 0 : CLOUDABI_EFAULT; break; case ERESTART: /* Restart system call. */ frame->tf_rip -= frame->tf_err; frame->tf_r10 = frame->tf_rcx; set_pcb_flags(td->td_pcb, PCB_FULL_IRET); break; case EJUSTRETURN: break; default: /* System call returned an error. */ frame->tf_rax = cloudabi_convert_errno(error); break; } } static void cloudabi32_schedtail(struct thread *td) { struct trapframe *frame = td->td_frame; register_t retval[2]; /* Return values for processes returning from fork. */ if ((td->td_pflags & TDP_FORKING) != 0) { retval[0] = CLOUDABI_PROCESS_CHILD; retval[1] = td->td_tid; copyout(retval, (void *)frame->tf_rcx, sizeof(retval)); } } int cloudabi32_thread_setregs(struct thread *td, const cloudabi32_threadattr_t *attr, uint32_t tcb) { stack_t stack; uint32_t args[3]; void *frameptr; int error; /* Perform standard register initialization. */ stack.ss_sp = TO_PTR(attr->stack); stack.ss_size = attr->stack_len - sizeof(args); cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack); /* * Copy the arguments for the thread entry point onto the stack * (args[1] and args[2]). Similar to process startup, use the * otherwise unused return address (args[0]) for TLS. */ args[0] = tcb; args[1] = td->td_tid; args[2] = attr->argument; frameptr = (void *)td->td_frame->tf_rsp; error = copyout(args, frameptr, sizeof(args)); if (error != 0) return (error); return (cpu_set_user_tls(td, frameptr)); } static struct sysentvec cloudabi32_elf_sysvec = { .sv_size = CLOUDABI32_SYS_MAXSYSCALL, .sv_table = cloudabi32_sysent, .sv_fixup = cloudabi32_fixup_tcb, .sv_name = "CloudABI ELF32", .sv_coredump = elf32_coredump, .sv_pagesize = IA32_PAGE_SIZE, .sv_minuser = FREEBSD32_MINUSER, .sv_maxuser = FREEBSD32_MAXUSER, .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, .sv_copyout_strings = cloudabi32_copyout_strings, .sv_setregs = cloudabi32_proc_setregs, .sv_fixlimit = ia32_fixlimit, .sv_maxssiz = &ia32_maxssiz, .sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_IA32 | SV_ILP32, .sv_set_syscall_retval = cloudabi32_set_syscall_retval, .sv_fetch_syscall_args = cloudabi32_fetch_syscall_args, .sv_syscallnames = cloudabi32_syscallnames, .sv_schedtail = cloudabi32_schedtail, }; INIT_SYSENTVEC(elf_sysvec, &cloudabi32_elf_sysvec); Elf32_Brandinfo cloudabi32_brand = { .brand = ELFOSABI_CLOUDABI, .machine = EM_386, .sysvec = &cloudabi32_elf_sysvec, .flags = BI_BRAND_ONLY_STATIC, };