ee13ffbe03
For FreeBSD/arm64's cloudabi32 support, I'm going to need a TO_PTR() in this place. Also use it for all of the other source files, so that the difference remains as minimal as possible. MFC after: 2 weeks
236 lines
6.8 KiB
C
236 lines
6.8 KiB
C
/*-
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* Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/imgact.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/sysent.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include <machine/vmparam.h>
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#include <compat/cloudabi/cloudabi_util.h>
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#include <compat/cloudabi32/cloudabi32_syscall.h>
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#include <compat/cloudabi32/cloudabi32_util.h>
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#include <compat/ia32/ia32_signal.h>
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#include <compat/ia32/ia32_util.h>
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extern const char *cloudabi32_syscallnames[];
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extern struct sysent cloudabi32_sysent[];
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extern unsigned long ia32_maxssiz;
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static int
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cloudabi32_fixup_tcb(register_t **stack_base, struct image_params *imgp)
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{
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int error;
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uint32_t args[2];
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/* Place auxiliary vector and TCB on the stack. */
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error = cloudabi32_fixup(stack_base, imgp);
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if (error != 0)
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return (error);
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/*
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* On i386, the TCB is referred to by %gs:0. Reuse the empty
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* space normally used by the return address (args[0]) to store
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* a single element array, containing a pointer to the TCB. %gs
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* base will point to this.
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*
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* Also let the first argument of the entry point (args[1])
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* refer to the auxiliary vector, which is stored right after
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* the TCB.
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*/
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args[0] = (uintptr_t)*stack_base;
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args[1] = (uintptr_t)*stack_base +
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roundup(sizeof(cloudabi32_tcb_t), sizeof(register_t));
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*stack_base -= howmany(sizeof(args), sizeof(register_t));
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return (copyout(args, *stack_base, sizeof(args)));
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}
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static void
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cloudabi32_proc_setregs(struct thread *td, struct image_params *imgp,
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unsigned long stack)
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{
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ia32_setregs(td, imgp, stack);
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(void)cpu_set_user_tls(td, TO_PTR(stack));
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}
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static int
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cloudabi32_fetch_syscall_args(struct thread *td)
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{
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struct trapframe *frame;
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struct syscall_args *sa;
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int error;
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frame = td->td_frame;
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sa = &td->td_sa;
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/* Obtain system call number. */
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sa->code = frame->tf_rax;
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if (sa->code >= CLOUDABI32_SYS_MAXSYSCALL)
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return (ENOSYS);
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sa->callp = &cloudabi32_sysent[sa->code];
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sa->narg = sa->callp->sy_narg;
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/*
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* Fetch system call arguments.
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*
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* The vDSO has already made sure that the arguments are
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* eight-byte aligned. Pointers and size_t parameters are
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* zero-extended. This makes it possible to copy in the
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* arguments directly. As long as the call doesn't use 32-bit
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* data structures, we can just invoke the same system call
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* implementation used by 64-bit processes.
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*/
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error = copyin((void *)frame->tf_rcx, sa->args,
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sa->narg * sizeof(sa->args[0]));
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if (error != 0)
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return (error);
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/* Default system call return values. */
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td->td_retval[0] = 0;
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td->td_retval[1] = 0;
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return (0);
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}
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static void
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cloudabi32_set_syscall_retval(struct thread *td, int error)
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{
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struct trapframe *frame = td->td_frame;
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switch (error) {
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case 0:
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/*
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* System call succeeded.
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*
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* Simply copy out the 64-bit return values into the
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* same buffer provided for system call arguments. The
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* vDSO will copy them to the right spot, truncating
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* pointers and size_t values to 32 bits.
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*/
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frame->tf_rax = copyout(td->td_retval, (void *)frame->tf_rcx,
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sizeof(td->td_retval)) == 0 ? 0 : CLOUDABI_EFAULT;
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break;
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case ERESTART:
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/* Restart system call. */
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frame->tf_rip -= frame->tf_err;
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frame->tf_r10 = frame->tf_rcx;
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set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
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break;
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case EJUSTRETURN:
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break;
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default:
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/* System call returned an error. */
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frame->tf_rax = cloudabi_convert_errno(error);
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break;
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}
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}
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static void
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cloudabi32_schedtail(struct thread *td)
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{
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struct trapframe *frame = td->td_frame;
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register_t retval[2];
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/* Return values for processes returning from fork. */
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if ((td->td_pflags & TDP_FORKING) != 0) {
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retval[0] = CLOUDABI_PROCESS_CHILD;
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retval[1] = td->td_tid;
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copyout(retval, (void *)frame->tf_rcx, sizeof(retval));
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}
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}
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int
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cloudabi32_thread_setregs(struct thread *td,
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const cloudabi32_threadattr_t *attr, uint32_t tcb)
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{
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stack_t stack;
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uint32_t args[3];
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void *frameptr;
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int error;
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/* Perform standard register initialization. */
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stack.ss_sp = TO_PTR(attr->stack);
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stack.ss_size = attr->stack_len - sizeof(args);
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cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack);
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/*
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* Copy the arguments for the thread entry point onto the stack
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* (args[1] and args[2]). Similar to process startup, use the
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* otherwise unused return address (args[0]) for TLS.
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*/
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args[0] = tcb;
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args[1] = td->td_tid;
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args[2] = attr->argument;
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frameptr = (void *)td->td_frame->tf_rsp;
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error = copyout(args, frameptr, sizeof(args));
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if (error != 0)
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return (error);
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return (cpu_set_user_tls(td, frameptr));
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}
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static struct sysentvec cloudabi32_elf_sysvec = {
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.sv_size = CLOUDABI32_SYS_MAXSYSCALL,
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.sv_table = cloudabi32_sysent,
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.sv_fixup = cloudabi32_fixup_tcb,
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.sv_name = "CloudABI ELF32",
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.sv_coredump = elf32_coredump,
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.sv_pagesize = IA32_PAGE_SIZE,
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.sv_minuser = FREEBSD32_MINUSER,
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.sv_maxuser = FREEBSD32_MAXUSER,
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.sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
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.sv_copyout_strings = cloudabi32_copyout_strings,
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.sv_setregs = cloudabi32_proc_setregs,
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.sv_fixlimit = ia32_fixlimit,
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.sv_maxssiz = &ia32_maxssiz,
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.sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_IA32 | SV_ILP32,
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.sv_set_syscall_retval = cloudabi32_set_syscall_retval,
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.sv_fetch_syscall_args = cloudabi32_fetch_syscall_args,
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.sv_syscallnames = cloudabi32_syscallnames,
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.sv_schedtail = cloudabi32_schedtail,
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};
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INIT_SYSENTVEC(elf_sysvec, &cloudabi32_elf_sysvec);
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Elf32_Brandinfo cloudabi32_brand = {
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.brand = ELFOSABI_CLOUDABI,
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.machine = EM_386,
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.sysvec = &cloudabi32_elf_sysvec,
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.flags = BI_BRAND_ONLY_STATIC,
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};
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