diff options
Diffstat (limited to 'sys/i386/cloudabi32/cloudabi32_sysvec.c')
| -rw-r--r-- | sys/i386/cloudabi32/cloudabi32_sysvec.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/sys/i386/cloudabi32/cloudabi32_sysvec.c b/sys/i386/cloudabi32/cloudabi32_sysvec.c new file mode 100644 index 0000000..1ecd8d5 --- /dev/null +++ b/sys/i386/cloudabi32/cloudabi32_sysvec.c @@ -0,0 +1,204 @@ +/*- + * 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 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) +{ + + exec_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_eax; + 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 the stack. */ + error = copyin((void *)(frame->tf_esp + 4), 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] = frame->tf_edx; + 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_eax = td->td_retval[0]; + frame->tf_edx = td->td_retval[1]; + frame->tf_eflags &= ~PSL_C; + break; + case ERESTART: + /* Restart system call. */ + frame->tf_eip -= frame->tf_err; + break; + case EJUSTRETURN: + break; + default: + /* System call returned an error. */ + frame->tf_eax = cloudabi_convert_errno(error); + frame->tf_eflags |= PSL_C; + break; + } +} + +static void +cloudabi32_schedtail(struct thread *td) +{ + struct trapframe *frame = td->td_frame; + + /* Initial register values for processes returning from fork. */ + frame->tf_eax = CLOUDABI_PROCESS_CHILD; + frame->tf_edx = td->td_tid; +} + +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_esp; + 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 = 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_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", +}; |
