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-rw-r--r--sys/amd64/cloudabi32/cloudabi32_sysvec.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/sys/amd64/cloudabi32/cloudabi32_sysvec.c b/sys/amd64/cloudabi32/cloudabi32_sysvec.c
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index 000000000000..5cf73ab5bfe3
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+++ b/sys/amd64/cloudabi32/cloudabi32_sysvec.c
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+/*-
+ * 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/imgact.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/sysent.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/frame.h>
+#include <machine/pcb.h>
+#include <machine/vmparam.h>
+
+#include <compat/cloudabi/cloudabi_util.h>
+
+#include <compat/cloudabi32/cloudabi32_syscall.h>
+#include <compat/cloudabi32/cloudabi32_util.h>
+
+#include <compat/ia32/ia32_signal.h>
+#include <compat/ia32/ia32_util.h>
+
+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 syscall_args *sa)
+{
+ struct trapframe *frame = td->td_frame;
+ int error;
+
+ /* 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_size - 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,
+ .compat_3_brand = "CloudABI",
+};