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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>
#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,
uintptr_t 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 =
stack + roundup(sizeof(cloudabi32_tcb_t), sizeof(register_t));
(void)cpu_set_user_tls(td, TO_PTR(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_r12;
if (sa->code >= CLOUDABI32_SYS_MAXSYSCALL)
return (ENOSYS);
sa->callp = &cloudabi32_sysent[sa->code];
/* 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->callp->sy_narg > 4) {
error = copyin((void *)td->td_frame->tf_usr_sp, &sa->args[4],
(sa->callp->sy_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_len;
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, TO_PTR(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_elf_core_osabi = ELFOSABI_FREEBSD,
.sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
.sv_elf_core_prepare_notes = elf32_prepare_notes,
.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,
.flags = BI_BRAND_ONLY_STATIC,
};
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