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84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/* Declarations for caching. Typically used by remote back ends for
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caching remote memory.
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Copyright 1992, 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef DCACHE_H
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#define DCACHE_H
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/* The data cache leads to incorrect results because it doesn't know about
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volatile variables, thus making it impossible to debug functions which
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use hardware registers. Therefore it is #if 0'd out. Effect on
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performance is some, for backtraces of functions with a few
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arguments each. For functions with many arguments, the stack
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frames don't fit in the cache blocks, which makes the cache less
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helpful. Disabling the cache is a big performance win for fetching
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large structures, because the cache code fetched data in 16-byte
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chunks. */
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#define LINE_SIZE_POWER (4)
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/* eg 1<<3 == 8 */
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#define LINE_SIZE (1 << LINE_SIZE_POWER)
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/* Number of cache blocks */
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#define DCACHE_SIZE (64)
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struct dcache_block
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{
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struct dcache_block *next, *last;
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unsigned int addr; /* Address for which data is recorded. */
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int data[LINE_SIZE / sizeof (int)];
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};
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typedef int (*memxferfunc) PARAMS((CORE_ADDR memaddr,
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unsigned char *myaddr,
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int len));
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typedef struct {
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/* Function to actually read the target memory. */
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memxferfunc read_memory;
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/* Function to actually write the target memory */
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memxferfunc write_memory;
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/* free list */
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struct dcache_block dcache_free;
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/* in use list */
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struct dcache_block dcache_valid;
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/* The cache itself. */
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struct dcache_block *the_cache;
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} DCACHE;
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/* Using the data cache DCACHE return the contents of the word at
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address ADDR in the remote machine. */
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int dcache_fetch PARAMS((DCACHE *dcache, CORE_ADDR addr));
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/* Flush DCACHE. */
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void dcache_flush PARAMS((DCACHE *dcache));
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/* Initialize DCACHE. */
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DCACHE *dcache_init PARAMS((memxferfunc reading, memxferfunc writing));
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/* Write the word at ADDR both in the data cache and in the remote machine. */
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void dcache_poke PARAMS((DCACHE *dcache, CORE_ADDR addr, int data));
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#endif /* DCACHE_H */
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