FreeChainXenon/binutils-gdb
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

break dcache code out of remote.c

Browse source
This commit is contained in:
K. Richard Pixley 1993-09-01 00:43:09 +00:00
parent 46cf424778
commit d538b510a0
5 changed files with 183 additions and 219 deletions
Download patch file Download diff file Expand all files Collapse all files

67
gdb/dcache.c
View file

@ -21,10 +21,13 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "dcache.h"
#include "gdbcmd.h"
extern int insque();
extern int remque();
int remote_dcache = 0;
/* The data cache records all the data read from the remote machine
since the last time it stopped.
@ -41,17 +44,21 @@ dcache_flush (dcache)
{
register struct dcache_block *db;
while ((db = dcache->dcache_valid.next) != &dcache->dcache_valid)
{
remque (db);
insque (db, &dcache->dcache_free);
}
if (remote_dcache > 0)
while ((db = dcache->dcache_valid.next) != &dcache->dcache_valid)
{
remque (db);
insque (db, &dcache->dcache_free);
}
return;
}
/*
* If addr is present in the dcache, return the address of the block
* containing it.
*/
static
struct dcache_block *
dcache_hit (dcache, addr)
DCACHE *dcache;
@ -59,7 +66,8 @@ dcache_hit (dcache, addr)
{
register struct dcache_block *db;
if (addr & 3)
if (addr & 3
|| remote_dcache == 0)
abort ();
/* Search all cache blocks for one that is at this address. */
@ -70,16 +78,19 @@ dcache_hit (dcache, addr)
return db;
db = db->next;
}
return NULL;
}
/* Return the int data at address ADDR in dcache block DC. */
static
int
dcache_value (db, addr)
struct dcache_block *db;
unsigned int addr;
{
if (addr & 3)
if (addr & 3
|| remote_dcache == 0)
abort ();
return (db->data[XFORM (addr)]);
}
@ -91,12 +102,16 @@ dcache_value (db, addr)
prevents errors from creeping in if a memory retrieval is
interrupted (which used to put garbage blocks in the valid
list...). */
static
struct dcache_block *
dcache_alloc (dcache)
DCACHE *dcache;
{
register struct dcache_block *db;
if (remote_dcache == 0)
abort();
if ((db = dcache->dcache_free.next) == &dcache->dcache_free)
{
/* If we can't get one from the free list, take last valid and put
@ -111,8 +126,8 @@ dcache_alloc (dcache)
return (db);
}
/* Return the contents of the word at address ADDR in the remote machine,
using the data cache. */
/* Using the data cache DCACHE return the contents of the word at
address ADDR in the remote machine. */
int
dcache_fetch (dcache, addr)
DCACHE *dcache;
@ -120,6 +135,14 @@ dcache_fetch (dcache, addr)
{
register struct dcache_block *db;
if (remote_dcache == 0)
{
int i;
(*dcache->read_memory) (addr, (unsigned char *) &i, 4);
return(i);
}
db = dcache_hit (dcache, addr);
if (db == 0)
{
@ -143,6 +166,12 @@ dcache_poke (dcache, addr, data)
{
register struct dcache_block *db;
if (remote_dcache == 0)
{
(*dcache->write_memory) (addr, (unsigned char *) &data, 4);
return;
}
/* First make sure the word is IN the cache. DB is its cache block. */
db = dcache_hit (dcache, addr);
if (db == 0)
@ -152,8 +181,8 @@ dcache_poke (dcache, addr, data)
(*dcache->write_memory) (addr & ~LINE_SIZE_MASK, (unsigned char *) db->data, LINE_SIZE);
immediate_quit--;
db->addr = addr & ~LINE_SIZE_MASK;
remque (db); /* Off the free list */
insque (db, &dcache->dcache_valid); /* On the valid list */
remque (db); /* Off the free list */
insque (db, &dcache->dcache_valid); /* On the valid list */
}
/* Modify the word in the cache. */
@ -188,3 +217,19 @@ dcache_init (reading, writing)
return(dcache);
}
void
_initialitize_dcache ()
{
add_show_from_set
(add_set_cmd ("remotecache", class_support, var_boolean,
(char *) &remote_dcache,
"\
Set cache use for remote targets.\n\
When on, use data caching for remote targets. For many remote targets\n\
this option can offer better throughput for reading target memory.\n\
Unfortunately, gdb does not currently know anything about volatile\n\
registers and thus data caching will produce incorrect results with\n\
volatile registers are in use. By default, this option is off.",
&setlist),
&showlist);
}