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Carl Shapiro
cmucl
Commits
c871866f
Commit
c871866f
authored
32 years ago
by
wlott
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parent
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lisp/sunos-os.c
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c871866f
/*
* $Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/lisp/sunos-os.c,v 1.1 1992/09/08 20:32:23 wlott Exp $
*
* OS-dependent routines. This file (along with os.h) exports an
* OS-independent interface to the operating system VM facilities.
* Suprisingly, this interface looks a lot like the Mach interface
* (but simpler in some places). For some operating systems, a subset
* of these functions will have to be emulated.
*
* This is the SunOS version.
* March 1991, Miles Bader <miles@cogsci.ed.ack.uk> & ted <ted@edu.NMSU>
*
*/
/* #define DEBUG */
#include
<stdio.h>
#include
<signal.h>
#include
<sys/file.h>
#include
"os.h"
/* block size must be larger than the system page size */
#define SPARSE_BLOCK_SIZE (1<<15)
#define SPARSE_SIZE_MASK (SPARSE_BLOCK_SIZE-1)
#define PROT_DEFAULT OS_VM_PROT_ALL
#define OFFSET_NONE ((os_vm_offset_t)(~0))
#define EMPTYFILE "/tmp/empty"
#define ZEROFILE "/dev/zero"
#define MAX_SEGS 64
extern
char
*
getenv
();
/* ---------------------------------------------------------------- */
#define ADJ_OFFSET(off,adj) (((off)==OFFSET_NONE) ? OFFSET_NONE : ((off)+(adj)))
long
os_vm_page_size
=
(
-
1
);
static
struct
segment
{
os_vm_address_t
start
;
/* note: start & length are expected to be on page */
os_vm_size_t
length
;
/* boundaries */
long
file_offset
;
short
mapped_fd
;
short
protection
;
}
addr_map
[
MAX_SEGS
];
static
int
n_segments
=
0
;
static
int
zero_fd
=
(
-
1
),
empty_fd
=
(
-
1
);
static
os_vm_address_t
last_fault
=
0
;
static
os_vm_size_t
real_page_size_difference
=
0
;
void
os_init
()
{
char
*
empty_file
=
getenv
(
"CMUCL_EMPTYFILE"
);
if
(
empty_file
==
NULL
)
empty_file
=
EMPTYFILE
;
empty_fd
=
open
(
empty_file
,
O_RDONLY
|
O_CREAT
);
unlink
(
empty_file
);
zero_fd
=
open
(
ZEROFILE
,
O_RDONLY
);
os_vm_page_size
=
getpagesize
();
if
(
os_vm_page_size
>
OS_VM_DEFAULT_PAGESIZE
){
fprintf
(
stderr
,
"os_init: Pagesize too large (%d > %d)
\n
"
,
os_vm_page_size
,
OS_VM_DEFAULT_PAGESIZE
);
exit
(
1
);
}
else
{
/*
* we do this because there are apparently dependencies on
* the pagesize being OS_VM_DEFAULT_PAGESIZE somewhere...
* but since the OS doesn't know we're using this restriction,
* we have to grovel around a bit to enforce it, thus anything
* that uses real_page_size_difference.
*/
real_page_size_difference
=
OS_VM_DEFAULT_PAGESIZE
-
os_vm_page_size
;
os_vm_page_size
=
OS_VM_DEFAULT_PAGESIZE
;
}
}
/* ---------------------------------------------------------------- */
void
seg_force_resident
(
struct
segment
*
seg
,
os_vm_address_t
addr
,
os_vm_size_t
len
)
{
int
prot
=
seg
->
protection
;
if
(
prot
!=
0
){
os_vm_address_t
end
=
addr
+
len
,
touch
=
addr
;
while
(
touch
<
end
){
int
contents
=
(
*
(
char
*
)
touch
);
if
(
prot
&
OS_VM_PROT_WRITE
)
(
*
(
char
*
)
touch
)
=
contents
;
touch
=
(
os_vm_address_t
)(((
long
)
touch
+
SPARSE_BLOCK_SIZE
)
&~
SPARSE_SIZE_MASK
);
}
}
}
static
struct
segment
*
seg_create_nomerge
(
addr
,
len
,
protection
,
mapped_fd
,
file_offset
)
os_vm_address_t
addr
;
os_vm_size_t
len
;
int
protection
;
int
mapped_fd
;
{
int
n
;
struct
segment
*
seg
;
if
(
len
==
0
)
return
NULL
;
if
(
n_segments
==
MAX_SEGS
){
fprintf
(
stderr
,
"seg_create_nomerge: Out of segments
\n
"
);
return
NULL
;
}
for
(
n
=
n_segments
,
seg
=
addr_map
;
n
>
0
;
n
--
,
seg
++
)
if
(
addr
<
seg
->
start
){
seg
=
(
&
addr_map
[
n_segments
]);
while
(
n
-->
0
){
seg
[
0
]
=
seg
[
-
1
];
seg
--
;
}
break
;
}
n_segments
++
;
seg
->
start
=
addr
;
seg
->
length
=
len
;
seg
->
protection
=
protection
;
seg
->
mapped_fd
=
mapped_fd
;
seg
->
file_offset
=
file_offset
;
return
seg
;
}
/* returns the first segment containing addr */
static
struct
segment
*
seg_find
(
addr
)
os_vm_address_t
addr
;
{
int
n
;
struct
segment
*
seg
;
for
(
n
=
n_segments
,
seg
=
addr_map
;
n
>
0
;
n
--
,
seg
++
)
if
(
seg
->
start
<=
addr
&&
seg
->
start
+
seg
->
length
>
addr
)
return
seg
;
return
NULL
;
}
/* returns TRUE if the range from addr to addr+len intersects with any segment */
static
boolean
collides_with_seg_p
(
addr
,
len
)
os_vm_address_t
addr
;
os_vm_size_t
len
;
{
int
n
;
struct
segment
*
seg
;
os_vm_address_t
end
=
addr
+
len
;
for
(
n
=
n_segments
,
seg
=
addr_map
;
n
>
0
;
n
--
,
seg
++
)
if
(
seg
->
start
>=
end
)
return
FALSE
;
else
if
(
seg
->
start
+
seg
->
length
>
addr
)
return
TRUE
;
return
FALSE
;
}
#define seg_last_p(seg) (((seg)-addr_map)>=n_segments-1)
static
void
seg_destroy
(
seg
)
struct
segment
*
seg
;
{
if
(
seg
!=
NULL
){
int
n
;
for
(
n
=
seg
-
addr_map
+
1
;
n
<
n_segments
;
n
++
){
seg
[
0
]
=
seg
[
1
];
seg
++
;
}
n_segments
--
;
}
}
static
void
seg_try_merge_next
(
seg
)
struct
segment
*
seg
;
{
struct
segment
*
nseg
=
seg
+
1
;
if
(
!
seg_last_p
(
seg
)
&&
seg
->
start
+
seg
->
length
==
nseg
->
start
&&
seg
->
protection
==
nseg
->
protection
&&
seg
->
mapped_fd
==
nseg
->
mapped_fd
&&
ADJ_OFFSET
(
seg
->
file_offset
,
seg
->
length
)
==
nseg
->
file_offset
)
{
/* can merge with the next segment */
#ifdef DEBUG
fprintf
(
stderr
,
";;; seg_try_merge: Merged 0x%08x[0x%08x] with 0x%08x[0x%08x]
\n
"
,
seg
->
start
,
seg
->
length
,
nseg
->
start
,
nseg
->
length
);
#endif
if
(((
long
)
nseg
->
start
&
SPARSE_SIZE_MASK
)
!=
0
){
/*
* if not on a block boundary, we have to ensure both parts
* of a common block are in a known state
*/
seg_force_resident
(
seg
,
nseg
->
start
-
1
,
1
);
seg_force_resident
(
nseg
,
nseg
->
start
,
1
);
}
seg
->
length
+=
nseg
->
length
;
seg_destroy
(
nseg
);
}
}
/*
* Try to merge seg with adjacent segments.
*/
static
void
seg_try_merge_adjacent
(
seg
)
struct
segment
*
seg
;
{
if
(
!
seg_last_p
(
seg
))
seg_try_merge_next
(
seg
);
if
(
seg
>
addr_map
)
seg_try_merge_next
(
seg
-
1
);
}
static
struct
segment
*
seg_create
(
addr
,
len
,
protection
,
mapped_fd
,
file_offset
)
os_vm_address_t
addr
;
os_vm_size_t
len
;
int
protection
;
int
mapped_fd
;
{
struct
segment
*
seg
=
seg_create_nomerge
(
addr
,
len
,
protection
,
mapped_fd
,
file_offset
);
if
(
seg
!=
NULL
)
seg_try_merge_adjacent
(
seg
);
return
seg
;
}
/*
* Change the attributes of the given range of an existing segment, and return
* a segment corresponding to the new bit.
*/
static
struct
segment
*
seg_change_range
(
seg
,
addr
,
len
,
protection
,
mapped_fd
,
file_offset
)
struct
segment
*
seg
;
os_vm_address_t
addr
;
os_vm_size_t
len
;
int
protection
;
int
mapped_fd
;
{
os_vm_address_t
end
=
addr
+
len
;
if
(
len
==
0
)
return
NULL
;
if
(
protection
!=
seg
->
protection
||
mapped_fd
!=
seg
->
mapped_fd
||
file_offset
!=
ADJ_OFFSET
(
seg
->
file_offset
,
addr
-
seg
->
start
))
{
os_vm_size_t
old_len
=
seg
->
length
,
seg_offset
=
(
addr
-
seg
->
start
);
if
(
old_len
<
len
+
seg_offset
){
struct
segment
*
next
=
seg
+
1
;
#ifdef DEBUG
fprintf
(
stderr
,
";;; seg_change_range: region 0x%08x[0x%08x] overflows 0x%08x[0x%08x]
\n
"
,
addr
,
len
,
seg
->
start
,
old_len
);
#endif
while
(
!
seg_last_p
(
seg
)
&&
next
->
start
+
next
->
length
<=
end
){
#ifdef DEBUG
fprintf
(
stderr
,
";;; seg_change_range: merging extra segment 0x%08x[0x%08x]
\n
"
,
next
->
start
,
next
->
length
);
#endif
seg_destroy
(
next
);
}
if
(
!
seg_last_p
(
seg
)
&&
next
->
start
<
end
){
next
->
length
-=
end
-
next
->
start
;
next
->
start
=
end
;
old_len
=
next
->
start
-
seg
->
start
;
}
else
old_len
=
len
+
seg_offset
;
#ifdef DEBUG
fprintf
(
stderr
,
";;; seg_change_range: extended first seg to 0x%08x[0x%08x]
\n
"
,
seg
->
start
,
old_len
);
#endif
}
if
(
seg_offset
+
len
<
old_len
){
/* add second part of old segment */
seg_create_nomerge
(
end
,
old_len
-
(
seg_offset
+
len
),
seg
->
protection
,
seg
->
mapped_fd
,
ADJ_OFFSET
(
seg
->
file_offset
,
seg_offset
+
len
));
#ifdef DEBUG
fprintf
(
stderr
,
";;; seg_change_range: Split off end of 0x%08x[0x%08x]: 0x%08x[0x%08x]
\n
"
,
seg
->
start
,
old_len
,
end
,
old_len
-
(
seg_offset
+
len
));
#endif
}
if
(
seg_offset
==
0
){
seg
->
length
=
len
;
seg
->
protection
=
protection
;
seg
->
mapped_fd
=
mapped_fd
;
seg
->
file_offset
=
file_offset
;
}
else
{
/* adjust first part of remaining old segment */
seg
->
length
=
seg_offset
;
#ifdef DEBUG
fprintf
(
stderr
,
";;; seg_change_range: Split off beginning of 0x%08x[0x%08x]: 0x%08x[0x%08x]
\n
"
,
seg
->
start
,
old_len
,
seg
->
start
,
seg_offset
);
#endif
/* add new middle segment for new protected region */
seg
=
seg_create_nomerge
(
addr
,
len
,
protection
,
mapped_fd
,
file_offset
);
}
seg_try_merge_adjacent
(
seg
);
last_fault
=
0
;
}
return
seg
;
}
/* ---------------------------------------------------------------- */
static
os_vm_address_t
mapin
(
addr
,
len
,
protection
,
map_fd
,
offset
,
is_readable
)
os_vm_address_t
addr
;
os_vm_size_t
len
;
int
protection
;
int
map_fd
;
long
offset
;
int
is_readable
;
{
os_vm_address_t
real
;
boolean
sparse
=
(
len
>=
SPARSE_BLOCK_SIZE
);
if
(
offset
!=
OFFSET_NONE
&&
(
offset
<
os_vm_page_size
||
(
offset
&
(
os_vm_page_size
-
1
))
!=
0
))
{
fprintf
(
stderr
,
"mapin: file offset (%d) not multiple of pagesize (%d)
\n
"
,
offset
,
os_vm_page_size
);
}
if
(
addr
==
NULL
)
len
+=
real_page_size_difference
;
/* futz around to get an aligned region */
last_fault
=
0
;
real
=
(
os_vm_address_t
)
mmap
((
caddr_t
)
addr
,
(
long
)
len
,
sparse
?
(
is_readable
?
PROT_READ
|
PROT_EXEC
:
0
)
:
protection
,
(
addr
==
NULL
?
0
:
MAP_FIXED
)
|
MAP_PRIVATE
,
(
is_readable
||
!
sparse
)
?
map_fd
:
empty_fd
,
(
off_t
)(
offset
==
OFFSET_NONE
?
0
:
offset
));
if
((
long
)
real
==-
1
){
perror
(
"mapin: mmap"
);
return
NULL
;
}
if
(
addr
==
NULL
){
/*
* now play around with what the os gave us to make it align by
* our standards (which is why we overallocated)
*/
os_vm_size_t
overflow
;
addr
=
os_round_up_to_page
(
real
);
if
(
addr
!=
real
)
munmap
(
real
,
addr
-
real
);
overflow
=
real_page_size_difference
-
(
addr
-
real
);
if
(
overflow
!=
0
)
munmap
(
addr
+
len
-
real_page_size_difference
,
overflow
);
real
=
addr
;
}
return
real
;
}
static
os_vm_address_t
map_and_remember
(
addr
,
len
,
protection
,
map_fd
,
offset
,
is_readable
)
os_vm_address_t
addr
;
os_vm_size_t
len
;
int
protection
;
int
map_fd
;
long
offset
;
int
is_readable
;
{
os_vm_address_t
real
=
mapin
(
addr
,
len
,
protection
,
map_fd
,
offset
,
is_readable
);
if
(
real
!=
NULL
){
struct
segment
*
seg
=
seg_find
(
real
);
if
(
seg
!=
NULL
)
seg
=
seg_change_range
(
seg
,
real
,
len
,
protection
,
map_fd
,
offset
);
else
seg
=
seg_create
(
real
,
len
,
protection
,
map_fd
,
offset
);
if
(
seg
==
NULL
){
munmap
(
real
,
len
);
return
NULL
;
}
}
#ifdef DEBUG
fprintf
(
stderr
,
";;; map_and_remember: 0x%08x[0x%08x] offset: %d, mapped to: %d
\n
"
,
real
,
len
,
offset
,
map_fd
);
#endif
return
real
;
}
/* ---------------------------------------------------------------- */
os_vm_address_t
os_validate
(
addr
,
len
)
os_vm_address_t
addr
;
os_vm_size_t
len
;
{
addr
=
os_trunc_to_page
(
addr
);
len
=
os_round_up_size_to_page
(
len
);
#ifdef DEBUG
fprintf
(
stderr
,
";;; os_validate: 0x%08x[0x%08x]
\n
"
,
addr
,
len
);
#endif
if
(
addr
!=
NULL
&&
collides_with_seg_p
(
addr
,
len
))
return
NULL
;
return
map_and_remember
(
addr
,
len
,
PROT_DEFAULT
,
zero_fd
,
OFFSET_NONE
,
FALSE
);
}
void
os_invalidate
(
addr
,
len
)
os_vm_address_t
addr
;
os_vm_size_t
len
;
{
struct
segment
*
seg
=
seg_find
(
addr
);
addr
=
os_trunc_to_page
(
addr
);
len
=
os_round_up_size_to_page
(
len
);
#ifdef DEBUG
fprintf
(
stderr
,
";;; os_invalidate: 0x%08x[0x%08x]
\n
"
,
addr
,
len
);
#endif
if
(
seg
==
NULL
)
fprintf
(
stderr
,
"os_invalidate: Unknown segment: 0x%08x[0x%08x]
\n
"
,
addr
,
len
);
else
{
seg
=
seg_change_range
(
seg
,
addr
,
len
,
0
,
0
,
OFFSET_NONE
);
if
(
seg
!=
NULL
)
seg_destroy
(
seg
);
last_fault
=
0
;
if
(
munmap
(
addr
,
len
)
!=
0
)
perror
(
"os_invalidate: munmap"
);
}
}
os_vm_address_t
os_map
(
fd
,
offset
,
addr
,
len
)
int
fd
;
int
offset
;
os_vm_address_t
addr
;
long
len
;
{
addr
=
os_trunc_to_page
(
addr
);
len
=
os_round_up_size_to_page
(
len
);
#ifdef DEBUG
fprintf
(
stderr
,
";;; os_map: 0x%08x[0x%08x]
\n
"
,
addr
,
len
);
#endif
return
map_and_remember
(
addr
,
len
,
PROT_DEFAULT
,
fd
,
offset
,
TRUE
);
}
void
os_flush_icache
(
address
,
length
)
os_vm_address_t
address
;
os_vm_size_t
length
;
{
#if defined(MACH) && defined(mips)
vm_machine_attribute_val_t
flush
;
kern_return_t
kr
;
flush
=
MATTR_VAL_ICACHE_FLUSH
;
kr
=
vm_machine_attribute
(
task_self
(),
address
,
length
,
MATTR_CACHE
,
&
flush
);
if
(
kr
!=
KERN_SUCCESS
)
mach_error
(
"Could not flush the instruction cache"
,
kr
);
#endif
}
void
os_protect
(
addr
,
len
,
prot
)
os_vm_address_t
addr
;
os_vm_size_t
len
;
int
prot
;
{
struct
segment
*
seg
=
seg_find
(
addr
);
addr
=
os_trunc_to_page
(
addr
);
len
=
os_round_up_size_to_page
(
len
);
#ifdef DEBUG
fprintf
(
stderr
,
";;; os_protect: 0x%08x[0x%08x]
\n
"
,
addr
,
len
);
#endif
if
(
seg
!=
NULL
){
int
old_prot
=
seg
->
protection
;
if
(
prot
!=
old_prot
){
/*
* oooooh, sick: we have to make sure all the pages being protected have
* faulted in, so they're in a known state...
*/
seg_force_resident
(
seg
,
addr
,
len
);
seg_change_range
(
seg
,
addr
,
len
,
prot
,
seg
->
mapped_fd
,
seg
->
file_offset
);
if
(
mprotect
((
caddr_t
)
addr
,(
long
)
len
,
prot
)
!=
0
)
perror
(
"os_unprotect: mprotect"
);
}
}
else
fprintf
(
stderr
,
"os_protect: Unknown segment: 0x%08x[0x%08x]
\n
"
,
addr
,
len
);
}
boolean
valid_addr
(
test
)
os_vm_address_t
test
;
{
return
seg_find
(
test
)
!=
NULL
;
}
/* ---------------------------------------------------------------- */
static
boolean
maybe_gc
(
sig
,
code
,
context
)
int
sig
,
code
;
struct
sigcontext
*
context
;
{
/*
* It's necessary to enable recursive SEGVs, since the handle is
* used for multiple things (e.g., both gc-trigger & faulting in pages).
* We check against recursive gc's though...
*/
boolean
did_gc
;
static
already_trying
=
0
;
if
(
already_trying
)
return
FALSE
;
sigsetmask
(
context
->
sc_mask
);
already_trying
=
TRUE
;
did_gc
=
interrupt_maybe_gc
(
sig
,
code
,
context
);
already_trying
=
FALSE
;
return
did_gc
;
}
/*
* The primary point of catching segmentation violations is to allow
* read only memory to be re-mapped with more permissions when a write
* is attempted. this greatly decreases the residency of the program
* in swap space since read only areas don't take up room
*
* Running into the gc trigger page will also end up here...
*/
void
segv_handler
(
sig
,
code
,
context
,
addr
)
int
sig
,
code
;
struct
sigcontext
*
context
;
caddr_t
addr
;
{
if
(
code
==
SEGV_PROT
)
{
/* allow writes to this chunk */
struct
segment
*
seg
=
seg_find
(
addr
);
if
(
last_fault
==
addr
){
if
(
seg
!=
NULL
&&
maybe_gc
(
sig
,
code
,
context
))
/* we just garbage collected */
return
;
else
{
/* a *real* protection fault */
fprintf
(
stderr
,
"segv_handler: Real protection violation: 0x%08x
\n
"
,
addr
);
interrupt_handle_now
(
sig
,
code
,
context
);
}
}
else
last_fault
=
addr
;
if
(
seg
!=
NULL
){
int
err
;
/* round down to a page */
os_vm_address_t
block
=
(
os_vm_address_t
)((
long
)
addr
&~
SPARSE_SIZE_MASK
);
os_vm_size_t
length
=
SPARSE_BLOCK_SIZE
;
if
(
block
<
seg
->
start
){
length
-=
(
seg
->
start
-
block
);
block
=
seg
->
start
;
}
if
(
block
+
length
>
seg
->
start
+
seg
->
length
)
length
=
seg
->
start
+
seg
->
length
-
block
;
#if 0
/* unmap it. probably redundant. */
if(munmap(block,length) == -1)
perror("segv_handler: munmap");
#endif
/* and remap it with more permissions */
err
=
(
int
)
mmap
(
block
,
length
,
seg
->
protection
,
MAP_PRIVATE
|
MAP_FIXED
,
seg
->
mapped_fd
,
seg
->
file_offset
==
OFFSET_NONE
?
0
:
seg
->
file_offset
+
(
block
-
seg
->
start
));
if
(
err
==
-
1
)
{
perror
(
"segv_handler: mmap"
);
interrupt_handle_now
(
sig
,
code
,
context
);
}
}
else
{
fprintf
(
stderr
,
"segv_handler: 0x%08x not in any segment
\n
"
,
addr
);
interrupt_handle_now
(
sig
,
code
,
context
);
}
}
/*
* note that we check for a gc-trigger hit even if it's not a PROT error
*/
else
if
(
!
maybe_gc
(
sig
,
code
,
context
)){
static
int
nomap_count
=
0
;
if
(
code
==
SEGV_NOMAP
){
if
(
nomap_count
==
0
){
fprintf
(
stderr
,
"segv_handler: No mapping fault: 0x%08x
\n
"
,
addr
);
nomap_count
++
;
}
else
{
/*
* There should be higher-level protection against stack
* overflow somewhere, but at least this prevents infinite
* puking of error messages...
*/
fprintf
(
stderr
,
"segv_handler: Recursive no mapping fault (stack overflow?)
\n
"
);
exit
(
-
1
);
}
}
else
if
(
SEGV_CODE
(
code
)
==
SEGV_OBJERR
){
extern
int
errno
;
errno
=
SEGV_ERRNO
(
code
);
perror
(
"segv_handler: Object error"
);
}
interrupt_handle_now
(
sig
,
code
,
context
);
if
(
code
==
SEGV_NOMAP
)
nomap_count
--
;
}
}
void
os_install_interrupt_handlers
()
{
interrupt_install_low_level_handler
(
SIGSEGV
,
segv_handler
);
}
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