static int
arm32_sync_icache(struct thread *td, void *args)
{
struct arm_sync_icache_args ua;
int error;
ksiginfo_t ksi;
#if __ARM_ARCH >= 6
vm_offset_t rv;
#endif
if ((error = copyin(args, &ua, sizeof(ua))) != 0)
return (error);
if (ua.len == 0) {
td->td_retval[0] = 0;
return (0);
}
/*
* Validate arguments. Address and length are unsigned,
* so we can use wrapped overflow check.
*/
if (((ua.addr + ua.len) < ua.addr) ||
((ua.addr + ua.len) > VM_MAXUSER_ADDRESS)) {
ksiginfo_init_trap(&ksi);
ksi.ksi_signo = SIGSEGV;
ksi.ksi_code = SEGV_ACCERR;
ksi.ksi_addr = (void *)max(ua.addr, VM_MAXUSER_ADDRESS);
trapsignal(td, &ksi);
return (EINVAL);
}
#if __ARM_ARCH >= 6
rv = sync_icache(ua.addr, ua.len);
if (rv != 1) {
ksiginfo_init_trap(&ksi);
ksi.ksi_signo = SIGSEGV;
ksi.ksi_code = SEGV_MAPERR;
ksi.ksi_addr = (void *)rv;
trapsignal(td, &ksi);
return (EINVAL);
}
#else
cpu_icache_sync_range(ua.addr, ua.len);
#endif
td->td_retval[0] = 0;
return (0);
}
/*
* Perform I/O to a given process. This will return EIO if we dectect
* corrupt memory and ENXIO if there is no such mapped address in the
* user process's address space.
*/
static int
urw(proc_t *p, int writing, void *buf, size_t len, uintptr_t a)
{
caddr_t addr = (caddr_t)a;
caddr_t page;
caddr_t vaddr;
struct seg *seg;
int error = 0;
int err = 0;
uint_t prot;
uint_t prot_rw = writing ? PROT_WRITE : PROT_READ;
int protchanged;
on_trap_data_t otd;
int retrycnt;
struct as *as = p->p_as;
enum seg_rw rw;
/*
* Locate segment containing address of interest.
*/
page = (caddr_t)(uintptr_t)((uintptr_t)addr & PAGEMASK);
retrycnt = 0;
AS_LOCK_ENTER(as, &as->a_lock, RW_WRITER);
retry:
if ((seg = as_segat(as, page)) == NULL ||
!page_valid(seg, page)) {
AS_LOCK_EXIT(as, &as->a_lock);
return (ENXIO);
}
SEGOP_GETPROT(seg, page, 0, &prot);
protchanged = 0;
if ((prot & prot_rw) == 0) {
protchanged = 1;
err = SEGOP_SETPROT(seg, page, PAGESIZE, prot | prot_rw);
if (err == IE_RETRY) {
protchanged = 0;
ASSERT(retrycnt == 0);
retrycnt++;
goto retry;
}
if (err != 0) {
AS_LOCK_EXIT(as, &as->a_lock);
return (ENXIO);
}
}
/*
* segvn may do a copy-on-write for F_SOFTLOCK/S_READ case to break
* sharing to avoid a copy on write of a softlocked page by another
* thread. But since we locked the address space as a writer no other
* thread can cause a copy on write. S_READ_NOCOW is passed as the
* access type to tell segvn that it's ok not to do a copy-on-write
* for this SOFTLOCK fault.
*/
if (writing)
rw = S_WRITE;
else if (seg->s_ops == &segvn_ops)
rw = S_READ_NOCOW;
else
rw = S_READ;
if (SEGOP_FAULT(as->a_hat, seg, page, PAGESIZE, F_SOFTLOCK, rw)) {
if (protchanged)
(void) SEGOP_SETPROT(seg, page, PAGESIZE, prot);
AS_LOCK_EXIT(as, &as->a_lock);
return (ENXIO);
}
CPU_STATS_ADD_K(vm, softlock, 1);
/*
* Make sure we're not trying to read or write off the end of the page.
*/
ASSERT(len <= page + PAGESIZE - addr);
/*
* Map in the locked page, copy to our local buffer,
* then map the page out and unlock it.
*/
vaddr = mapin(as, addr, writing);
/*
* Since we are copying memory on behalf of the user process,
* protect against memory error correction faults.
*/
if (!on_trap(&otd, OT_DATA_EC)) {
if (seg->s_ops == &segdev_ops) {
/*
* Device memory can behave strangely; invoke
* a segdev-specific copy operation instead.
*/
if (writing) {
if (segdev_copyto(seg, addr, buf, vaddr, len))
error = ENXIO;
} else {
if (segdev_copyfrom(seg, addr, vaddr, buf, len))
error = ENXIO;
}
} else {
if (writing)
bcopy(buf, vaddr, len);
else
bcopy(vaddr, buf, len);
}
} else {
error = EIO;
}
no_trap();
/*
* If we're writing to an executable page, we may need to sychronize
* the I$ with the modifications we made through the D$.
*/
if (writing && (prot & PROT_EXEC))
sync_icache(vaddr, (uint_t)len);
mapout(as, addr, vaddr, writing);
if (rw == S_READ_NOCOW)
rw = S_READ;
(void) SEGOP_FAULT(as->a_hat, seg, page, PAGESIZE, F_SOFTUNLOCK, rw);
if (protchanged)
(void) SEGOP_SETPROT(seg, page, PAGESIZE, prot);
AS_LOCK_EXIT(as, &as->a_lock);
return (error);
}