a7b890448c
function cpu_set_syscall_retval(). Suggested by: marcel Reviewed by: marcel, davidxu PowerPC, ARM, ia64 changes: marcel Sparc64 tested and reviewed by: marius, also sunv reviewed MIPS tested by: gonzo MFC after: 1 month
544 lines
14 KiB
C
544 lines
14 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986 The Regents of the University of California.
|
|
* Copyright (c) 1989, 1990 William Jolitz
|
|
* Copyright (c) 1994 John Dyson
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department, and William Jolitz.
|
|
*
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*
|
|
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
|
|
* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
|
|
* $FreeBSD$
|
|
*/
|
|
/*-
|
|
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Author: Chris G. Demetriou
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
|
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie the
|
|
* rights to redistribute these changes.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/ktr.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/vmmeter.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/sf_buf.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/unistd.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/fpu.h>
|
|
#include <machine/frame.h>
|
|
#include <machine/md_var.h>
|
|
#include <machine/pcb.h>
|
|
|
|
#include <dev/ofw/openfirm.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_kern.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_extern.h>
|
|
|
|
/*
|
|
* On systems without a direct mapped region (e.g. PPC64),
|
|
* we use the same code as the Book E implementation. Since
|
|
* we need to have runtime detection of this, define some machinery
|
|
* for sf_bufs in this case, and ignore it on systems with direct maps.
|
|
*/
|
|
|
|
#ifndef NSFBUFS
|
|
#define NSFBUFS (512 + maxusers * 16)
|
|
#endif
|
|
|
|
static void sf_buf_init(void *arg);
|
|
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL);
|
|
|
|
LIST_HEAD(sf_head, sf_buf);
|
|
|
|
/* A hash table of active sendfile(2) buffers */
|
|
static struct sf_head *sf_buf_active;
|
|
static u_long sf_buf_hashmask;
|
|
|
|
#define SF_BUF_HASH(m) (((m) - vm_page_array) & sf_buf_hashmask)
|
|
|
|
static TAILQ_HEAD(, sf_buf) sf_buf_freelist;
|
|
static u_int sf_buf_alloc_want;
|
|
|
|
/*
|
|
* A lock used to synchronize access to the hash table and free list
|
|
*/
|
|
static struct mtx sf_buf_lock;
|
|
|
|
|
|
/*
|
|
* Finish a fork operation, with process p2 nearly set up.
|
|
* Copy and update the pcb, set up the stack so that the child
|
|
* ready to run and return to user mode.
|
|
*/
|
|
void
|
|
cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
|
|
{
|
|
struct proc *p1;
|
|
struct trapframe *tf;
|
|
struct callframe *cf;
|
|
struct pcb *pcb;
|
|
|
|
KASSERT(td1 == curthread || td1 == &thread0,
|
|
("cpu_fork: p1 not curproc and not proc0"));
|
|
CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags);
|
|
|
|
if ((flags & RFPROC) == 0)
|
|
return;
|
|
|
|
p1 = td1->td_proc;
|
|
|
|
pcb = (struct pcb *)((td2->td_kstack +
|
|
td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fU);
|
|
td2->td_pcb = pcb;
|
|
|
|
/* Copy the pcb */
|
|
bcopy(td1->td_pcb, pcb, sizeof(struct pcb));
|
|
|
|
/*
|
|
* Create a fresh stack for the new process.
|
|
* Copy the trap frame for the return to user mode as if from a
|
|
* syscall. This copies most of the user mode register values.
|
|
*/
|
|
tf = (struct trapframe *)pcb - 1;
|
|
bcopy(td1->td_frame, tf, sizeof(*tf));
|
|
|
|
/* Set up trap frame. */
|
|
tf->fixreg[FIRSTARG] = 0;
|
|
tf->fixreg[FIRSTARG + 1] = 0;
|
|
tf->cr &= ~0x10000000;
|
|
|
|
td2->td_frame = tf;
|
|
|
|
cf = (struct callframe *)tf - 1;
|
|
memset(cf, 0, sizeof(struct callframe));
|
|
cf->cf_func = (register_t)fork_return;
|
|
cf->cf_arg0 = (register_t)td2;
|
|
cf->cf_arg1 = (register_t)tf;
|
|
|
|
pcb->pcb_sp = (register_t)cf;
|
|
pcb->pcb_lr = (register_t)fork_trampoline;
|
|
pcb->pcb_cpu.aim.usr = kernel_pmap->pm_sr[USER_SR];
|
|
|
|
/* Setup to release spin count in fork_exit(). */
|
|
td2->td_md.md_spinlock_count = 1;
|
|
td2->td_md.md_saved_msr = PSL_KERNSET;
|
|
|
|
/*
|
|
* Now cpu_switch() can schedule the new process.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Intercept the return address from a freshly forked process that has NOT
|
|
* been scheduled yet.
|
|
*
|
|
* This is needed to make kernel threads stay in kernel mode.
|
|
*/
|
|
void
|
|
cpu_set_fork_handler(td, func, arg)
|
|
struct thread *td;
|
|
void (*func)(void *);
|
|
void *arg;
|
|
{
|
|
struct callframe *cf;
|
|
|
|
CTR4(KTR_PROC, "%s called with td=%08x func=%08x arg=%08x",
|
|
__func__, (u_int)td, (u_int)func, (u_int)arg);
|
|
|
|
cf = (struct callframe *)td->td_pcb->pcb_sp;
|
|
|
|
cf->cf_func = (register_t)func;
|
|
cf->cf_arg0 = (register_t)arg;
|
|
}
|
|
|
|
void
|
|
cpu_exit(td)
|
|
register struct thread *td;
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Reset back to firmware.
|
|
*/
|
|
void
|
|
cpu_reset()
|
|
{
|
|
OF_reboot();
|
|
}
|
|
|
|
/*
|
|
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
|
|
*/
|
|
static void
|
|
sf_buf_init(void *arg)
|
|
{
|
|
struct sf_buf *sf_bufs;
|
|
vm_offset_t sf_base;
|
|
int i;
|
|
|
|
/* Don't bother on systems with a direct map */
|
|
|
|
if (hw_direct_map)
|
|
return;
|
|
|
|
nsfbufs = NSFBUFS;
|
|
TUNABLE_INT_FETCH("kern.ipc.nsfbufs", &nsfbufs);
|
|
|
|
sf_buf_active = hashinit(nsfbufs, M_TEMP, &sf_buf_hashmask);
|
|
TAILQ_INIT(&sf_buf_freelist);
|
|
sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
|
|
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP, M_NOWAIT | M_ZERO);
|
|
|
|
for (i = 0; i < nsfbufs; i++) {
|
|
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
|
|
TAILQ_INSERT_TAIL(&sf_buf_freelist, &sf_bufs[i], free_entry);
|
|
}
|
|
sf_buf_alloc_want = 0;
|
|
mtx_init(&sf_buf_lock, "sf_buf", NULL, MTX_DEF);
|
|
}
|
|
|
|
/*
|
|
* Get an sf_buf from the freelist. Will block if none are available.
|
|
*/
|
|
struct sf_buf *
|
|
sf_buf_alloc(struct vm_page *m, int flags)
|
|
{
|
|
struct sf_head *hash_list;
|
|
struct sf_buf *sf;
|
|
int error;
|
|
|
|
if (hw_direct_map) {
|
|
/* Shortcut the direct mapped case */
|
|
|
|
return ((struct sf_buf *)m);
|
|
}
|
|
|
|
hash_list = &sf_buf_active[SF_BUF_HASH(m)];
|
|
mtx_lock(&sf_buf_lock);
|
|
LIST_FOREACH(sf, hash_list, list_entry) {
|
|
if (sf->m == m) {
|
|
sf->ref_count++;
|
|
if (sf->ref_count == 1) {
|
|
TAILQ_REMOVE(&sf_buf_freelist, sf, free_entry);
|
|
nsfbufsused++;
|
|
nsfbufspeak = imax(nsfbufspeak, nsfbufsused);
|
|
}
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
while ((sf = TAILQ_FIRST(&sf_buf_freelist)) == NULL) {
|
|
if (flags & SFB_NOWAIT)
|
|
goto done;
|
|
|
|
sf_buf_alloc_want++;
|
|
mbstat.sf_allocwait++;
|
|
error = msleep(&sf_buf_freelist, &sf_buf_lock,
|
|
(flags & SFB_CATCH) ? PCATCH | PVM : PVM, "sfbufa", 0);
|
|
sf_buf_alloc_want--;
|
|
|
|
/*
|
|
* If we got a signal, don't risk going back to sleep.
|
|
*/
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
TAILQ_REMOVE(&sf_buf_freelist, sf, free_entry);
|
|
if (sf->m != NULL)
|
|
LIST_REMOVE(sf, list_entry);
|
|
|
|
LIST_INSERT_HEAD(hash_list, sf, list_entry);
|
|
sf->ref_count = 1;
|
|
sf->m = m;
|
|
nsfbufsused++;
|
|
nsfbufspeak = imax(nsfbufspeak, nsfbufsused);
|
|
pmap_qenter(sf->kva, &sf->m, 1);
|
|
done:
|
|
mtx_unlock(&sf_buf_lock);
|
|
return (sf);
|
|
}
|
|
|
|
/*
|
|
* Detatch mapped page and release resources back to the system.
|
|
*
|
|
* Remove a reference from the given sf_buf, adding it to the free
|
|
* list when its reference count reaches zero. A freed sf_buf still,
|
|
* however, retains its virtual-to-physical mapping until it is
|
|
* recycled or reactivated by sf_buf_alloc(9).
|
|
*/
|
|
void
|
|
sf_buf_free(struct sf_buf *sf)
|
|
{
|
|
if (hw_direct_map)
|
|
return;
|
|
|
|
mtx_lock(&sf_buf_lock);
|
|
sf->ref_count--;
|
|
if (sf->ref_count == 0) {
|
|
TAILQ_INSERT_TAIL(&sf_buf_freelist, sf, free_entry);
|
|
nsfbufsused--;
|
|
|
|
if (sf_buf_alloc_want > 0)
|
|
wakeup_one(&sf_buf_freelist);
|
|
}
|
|
mtx_unlock(&sf_buf_lock);
|
|
}
|
|
|
|
/*
|
|
* Software interrupt handler for queued VM system processing.
|
|
*/
|
|
void
|
|
swi_vm(void *dummy)
|
|
{
|
|
#if 0 /* XXX: Don't have busdma stuff yet */
|
|
if (busdma_swi_pending != 0)
|
|
busdma_swi();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Tell whether this address is in some physical memory region.
|
|
* Currently used by the kernel coredump code in order to avoid
|
|
* dumping the ``ISA memory hole'' which could cause indefinite hangs,
|
|
* or other unpredictable behaviour.
|
|
*/
|
|
|
|
|
|
int
|
|
is_physical_memory(addr)
|
|
vm_offset_t addr;
|
|
{
|
|
/*
|
|
* stuff other tests for known memory-mapped devices (PCI?)
|
|
* here
|
|
*/
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Threading functions
|
|
*/
|
|
void
|
|
cpu_thread_exit(struct thread *td)
|
|
{
|
|
}
|
|
|
|
void
|
|
cpu_thread_clean(struct thread *td)
|
|
{
|
|
}
|
|
|
|
void
|
|
cpu_thread_alloc(struct thread *td)
|
|
{
|
|
struct pcb *pcb;
|
|
|
|
pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE -
|
|
sizeof(struct pcb)) & ~0x2fU);
|
|
td->td_pcb = pcb;
|
|
td->td_frame = (struct trapframe *)pcb - 1;
|
|
}
|
|
|
|
void
|
|
cpu_thread_free(struct thread *td)
|
|
{
|
|
}
|
|
|
|
void
|
|
cpu_thread_swapin(struct thread *td)
|
|
{
|
|
}
|
|
|
|
void
|
|
cpu_thread_swapout(struct thread *td)
|
|
{
|
|
}
|
|
|
|
void
|
|
cpu_set_syscall_retval(struct thread *td, int error)
|
|
{
|
|
struct proc *p;
|
|
struct trapframe *tf;
|
|
int fixup;
|
|
|
|
if (error == EJUSTRETURN)
|
|
return;
|
|
|
|
p = td->td_proc;
|
|
tf = td->td_frame;
|
|
|
|
if (tf->fixreg[0] == SYS___syscall) {
|
|
int code = tf->fixreg[FIRSTARG + 1];
|
|
if (p->p_sysent->sv_mask)
|
|
code &= p->p_sysent->sv_mask;
|
|
fixup = (code != SYS_freebsd6_lseek && code != SYS_lseek) ?
|
|
1 : 0;
|
|
} else
|
|
fixup = 0;
|
|
|
|
switch (error) {
|
|
case 0:
|
|
if (fixup) {
|
|
/*
|
|
* 64-bit return, 32-bit syscall. Fixup byte order
|
|
*/
|
|
tf->fixreg[FIRSTARG] = 0;
|
|
tf->fixreg[FIRSTARG + 1] = td->td_retval[0];
|
|
} else {
|
|
tf->fixreg[FIRSTARG] = td->td_retval[0];
|
|
tf->fixreg[FIRSTARG + 1] = td->td_retval[1];
|
|
}
|
|
tf->cr &= ~0x10000000; /* XXX: Magic number */
|
|
break;
|
|
case ERESTART:
|
|
/*
|
|
* Set user's pc back to redo the system call.
|
|
*/
|
|
tf->srr0 -= 4;
|
|
break;
|
|
default:
|
|
if (p->p_sysent->sv_errsize) {
|
|
error = (error < p->p_sysent->sv_errsize) ?
|
|
p->p_sysent->sv_errtbl[error] : -1;
|
|
}
|
|
tf->fixreg[FIRSTARG] = error;
|
|
tf->cr |= 0x10000000; /* XXX: Magic number */
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
cpu_set_upcall(struct thread *td, struct thread *td0)
|
|
{
|
|
struct pcb *pcb2;
|
|
struct trapframe *tf;
|
|
struct callframe *cf;
|
|
|
|
pcb2 = td->td_pcb;
|
|
|
|
/* Copy the upcall pcb */
|
|
bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
|
|
|
|
/* Create a stack for the new thread */
|
|
tf = td->td_frame;
|
|
bcopy(td0->td_frame, tf, sizeof(struct trapframe));
|
|
tf->fixreg[FIRSTARG] = 0;
|
|
tf->fixreg[FIRSTARG + 1] = 0;
|
|
tf->cr &= ~0x10000000;
|
|
|
|
/* Set registers for trampoline to user mode. */
|
|
cf = (struct callframe *)tf - 1;
|
|
memset(cf, 0, sizeof(struct callframe));
|
|
cf->cf_func = (register_t)fork_return;
|
|
cf->cf_arg0 = (register_t)td;
|
|
cf->cf_arg1 = (register_t)tf;
|
|
|
|
pcb2->pcb_sp = (register_t)cf;
|
|
pcb2->pcb_lr = (register_t)fork_trampoline;
|
|
pcb2->pcb_cpu.aim.usr = kernel_pmap->pm_sr[USER_SR];
|
|
|
|
/* Setup to release spin count in fork_exit(). */
|
|
td->td_md.md_spinlock_count = 1;
|
|
td->td_md.md_saved_msr = PSL_KERNSET;
|
|
}
|
|
|
|
void
|
|
cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg,
|
|
stack_t *stack)
|
|
{
|
|
struct trapframe *tf;
|
|
uint32_t sp;
|
|
|
|
tf = td->td_frame;
|
|
/* align stack and alloc space for frame ptr and saved LR */
|
|
sp = ((uint32_t)stack->ss_sp + stack->ss_size - sizeof(uint64_t)) &
|
|
~0x1f;
|
|
bzero(tf, sizeof(struct trapframe));
|
|
|
|
tf->fixreg[1] = (register_t)sp;
|
|
tf->fixreg[3] = (register_t)arg;
|
|
tf->srr0 = (register_t)entry;
|
|
tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT;
|
|
td->td_pcb->pcb_flags = 0;
|
|
|
|
td->td_retval[0] = (register_t)entry;
|
|
td->td_retval[1] = 0;
|
|
}
|
|
|
|
int
|
|
cpu_set_user_tls(struct thread *td, void *tls_base)
|
|
{
|
|
|
|
td->td_frame->fixreg[2] = (register_t)tls_base + 0x7008;
|
|
return (0);
|
|
}
|