freebsd-dev/sys/amd64/cloudabi64/cloudabi64_sysvec.c
Ed Schouten ee13ffbe03 Use TO_PTR() to convert integers to pointers.
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
2017-11-26 14:45:56 +00:00

222 lines
6.4 KiB
C

/*-
* Copyright (c) 2015 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/cloudabi64/cloudabi64_syscall.h>
#include <compat/cloudabi64/cloudabi64_util.h>
extern const char *cloudabi64_syscallnames[];
extern struct sysent cloudabi64_sysent[];
static int
cloudabi64_fixup_tcb(register_t **stack_base, struct image_params *imgp)
{
int error;
register_t tcbptr;
/* Place auxiliary vector and TCB on the stack. */
error = cloudabi64_fixup(stack_base, imgp);
if (error != 0)
return (error);
/*
* On x86-64, the TCB is referred to by %fs:0. Take some space
* from the top of the stack to store a single element array,
* containing a pointer to the TCB. %fs base will point to this.
*/
tcbptr = (register_t)*stack_base;
return (copyout(&tcbptr, --*stack_base, sizeof(tcbptr)));
}
static void
cloudabi64_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, the TCB itself,
* and the auxiliary vector. Let %rdx point to the auxiliary
* vector, and set %fs base to the address of the TCB.
*/
regs = td->td_frame;
regs->tf_rdi = stack + sizeof(register_t) +
roundup(sizeof(cloudabi64_tcb_t), sizeof(register_t));
(void)cpu_set_user_tls(td, TO_PTR(stack));
}
static int
cloudabi64_fetch_syscall_args(struct thread *td)
{
struct trapframe *frame;
struct syscall_args *sa;
frame = td->td_frame;
sa = &td->td_sa;
/* Obtain system call number. */
sa->code = frame->tf_rax;
if (sa->code >= CLOUDABI64_SYS_MAXSYSCALL)
return (ENOSYS);
sa->callp = &cloudabi64_sysent[sa->code];
sa->narg = sa->callp->sy_narg;
/* Fetch system call arguments. */
sa->args[0] = frame->tf_rdi;
sa->args[1] = frame->tf_rsi;
sa->args[2] = frame->tf_rdx;
sa->args[3] = frame->tf_rcx; /* Actually %r10. */
sa->args[4] = frame->tf_r8;
sa->args[5] = frame->tf_r9;
/* Default system call return values. */
td->td_retval[0] = 0;
td->td_retval[1] = frame->tf_rdx;
return (0);
}
static void
cloudabi64_set_syscall_retval(struct thread *td, int error)
{
struct trapframe *frame = td->td_frame;
switch (error) {
case 0:
/* System call succeeded. */
frame->tf_rax = td->td_retval[0];
frame->tf_rdx = td->td_retval[1];
frame->tf_rflags &= ~PSL_C;
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);
frame->tf_rflags |= PSL_C;
break;
}
}
static void
cloudabi64_schedtail(struct thread *td)
{
struct trapframe *frame = td->td_frame;
/* Initial register values for processes returning from fork. */
frame->tf_rax = CLOUDABI_PROCESS_CHILD;
frame->tf_rdx = td->td_tid;
}
int
cloudabi64_thread_setregs(struct thread *td,
const cloudabi64_threadattr_t *attr, uint64_t tcb)
{
struct trapframe *frame;
stack_t stack;
uint64_t tcbptr;
int error;
/*
* On x86-64, the TCB is referred to by %fs:0. Take some space
* from the top of the stack to store a single element array,
* containing a pointer to the TCB. %fs base will point to this.
*/
tcbptr = rounddown(attr->stack + attr->stack_len - sizeof(tcbptr),
_Alignof(tcbptr));
error = copyout(&tcb, (void *)tcbptr, sizeof(tcb));
if (error != 0)
return (error);
/* Perform standard register initialization. */
stack.ss_sp = TO_PTR(attr->stack);
stack.ss_size = tcbptr - attr->stack;
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_rdi = td->td_tid;
frame->tf_rsi = attr->argument;
return (cpu_set_user_tls(td, TO_PTR(tcbptr)));
}
static struct sysentvec cloudabi64_elf_sysvec = {
.sv_size = CLOUDABI64_SYS_MAXSYSCALL,
.sv_table = cloudabi64_sysent,
.sv_fixup = cloudabi64_fixup_tcb,
.sv_name = "CloudABI ELF64",
.sv_coredump = elf64_coredump,
.sv_pagesize = PAGE_SIZE,
.sv_minuser = VM_MIN_ADDRESS,
/* Keep top page reserved to work around AMD Ryzen stability issues. */
.sv_maxuser = VM_MAXUSER_ADDRESS - PAGE_SIZE,
.sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
.sv_copyout_strings = cloudabi64_copyout_strings,
.sv_setregs = cloudabi64_proc_setregs,
.sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_LP64,
.sv_set_syscall_retval = cloudabi64_set_syscall_retval,
.sv_fetch_syscall_args = cloudabi64_fetch_syscall_args,
.sv_syscallnames = cloudabi64_syscallnames,
.sv_schedtail = cloudabi64_schedtail,
};
INIT_SYSENTVEC(elf_sysvec, &cloudabi64_elf_sysvec);
Elf64_Brandinfo cloudabi64_brand = {
.brand = ELFOSABI_CLOUDABI,
.machine = EM_X86_64,
.sysvec = &cloudabi64_elf_sysvec,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_ONLY_STATIC,
};