diff options
Diffstat (limited to 'sys/arm/cloudabi32/cloudabi32_sysvec.c')
| -rw-r--r-- | sys/arm/cloudabi32/cloudabi32_sysvec.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/sys/arm/cloudabi32/cloudabi32_sysvec.c b/sys/arm/cloudabi32/cloudabi32_sysvec.c new file mode 100644 index 0000000..040dcc3 --- /dev/null +++ b/sys/arm/cloudabi32/cloudabi32_sysvec.c @@ -0,0 +1,193 @@ +/*- + * 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> + +extern const char *cloudabi32_syscallnames[]; +extern struct sysent cloudabi32_sysent[]; + +static void +cloudabi32_proc_setregs(struct thread *td, struct image_params *imgp, + unsigned long stack) +{ + struct trapframe *regs; + + exec_setregs(td, imgp, stack); + + /* + * The stack now contains a pointer to the TCB and the auxiliary + * vector. Let r0 point to the auxiliary vector, and set + * tpidrurw to the TCB. + */ + regs = td->td_frame; + regs->tf_r0 = td->td_retval[0] = + stack + roundup(sizeof(cloudabi32_tcb_t), sizeof(register_t)); + (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_r12; + if (sa->code >= CLOUDABI32_SYS_MAXSYSCALL) + return (ENOSYS); + sa->callp = &cloudabi32_sysent[sa->code]; + sa->narg = sa->callp->sy_narg; + + /* Fetch system call arguments from registers and the stack. */ + sa->args[0] = frame->tf_r0; + sa->args[1] = frame->tf_r1; + sa->args[2] = frame->tf_r2; + sa->args[3] = frame->tf_r3; + if (sa->narg > 4) { + error = copyin((void *)td->td_frame->tf_usr_sp, &sa->args[4], + (sa->narg - 4) * sizeof(register_t)); + if (error != 0) + return (error); + } + + /* Default system call return values. */ + td->td_retval[0] = 0; + td->td_retval[1] = frame->tf_r1; + 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. */ + frame->tf_r0 = td->td_retval[0]; + frame->tf_r1 = td->td_retval[1]; + frame->tf_spsr &= ~PSR_C; + break; + case ERESTART: + /* Restart system call. */ + frame->tf_pc -= 4; + break; + case EJUSTRETURN: + break; + default: + /* System call returned an error. */ + frame->tf_r0 = cloudabi_convert_errno(error); + frame->tf_spsr |= PSR_C; + break; + } +} + +static void +cloudabi32_schedtail(struct thread *td) +{ + struct trapframe *frame = td->td_frame; + + /* + * Initial register values for processes returning from fork. + * Make sure that we only set these values when forking, not + * when creating a new thread. + */ + if ((td->td_pflags & TDP_FORKING) != 0) { + frame->tf_r0 = CLOUDABI_PROCESS_CHILD; + frame->tf_r1 = td->td_tid; + } +} + +int +cloudabi32_thread_setregs(struct thread *td, + const cloudabi32_threadattr_t *attr, uint32_t tcb) +{ + struct trapframe *frame; + stack_t stack; + + /* Perform standard register initialization. */ + stack.ss_sp = TO_PTR(attr->stack); + stack.ss_size = attr->stack_size; + cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack); + + /* + * Pass in the thread ID of the new thread and the argument + * pointer provided by the parent thread in as arguments to the + * entry point. + */ + frame = td->td_frame; + frame->tf_r0 = td->td_tid; + frame->tf_r1 = attr->argument; + + /* Set up TLS. */ + return (cpu_set_user_tls(td, (void *)tcb)); +} + +static struct sysentvec cloudabi32_elf_sysvec = { + .sv_size = CLOUDABI32_SYS_MAXSYSCALL, + .sv_table = cloudabi32_sysent, + .sv_fixup = cloudabi32_fixup, + .sv_name = "CloudABI ELF32", + .sv_coredump = elf32_coredump, + .sv_pagesize = PAGE_SIZE, + .sv_minuser = VM_MIN_ADDRESS, + .sv_maxuser = VM_MAXUSER_ADDRESS, + .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, + .sv_copyout_strings = cloudabi32_copyout_strings, + .sv_setregs = cloudabi32_proc_setregs, + .sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | 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_ARM, + .sysvec = &cloudabi32_elf_sysvec, + .compat_3_brand = "CloudABI", +}; |
