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Moved functions for debugger memory access to db_memrw.c

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so they can be pulled in for either ddb and/or kgdb.
This commit is contained in:
gwr 1996-02-16 20:08:44 +00:00
parent 5cb4cacff1
commit 7b4335f9db
1 changed files with 1 additions and 144 deletions
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145
sys/arch/sun3/sun3/db_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_machdep.c,v 1.6 1995/10/23 18:40:35 gwr Exp $ */
/* $NetBSD: db_machdep.c,v 1.7 1996/02/16 20:08:44 gwr Exp $ */
/*
* Copyright (c) 1994, 1995 Gordon W. Ross
@ -44,149 +44,6 @@
#include <machine/pte.h>
#undef DEBUG
#ifdef DEBUG
int db_machdep_debug;
#endif
/*
* Interface to the debugger for virtual memory read/write.
*
* To write in the text segment, we have to first make
* the page writable, do the write, then restore the PTE.
* For writes outside the text segment, and all reads,
* just do the access -- if it causes a fault, the debugger
* will recover with a longjmp to an appropriate place.
*
* ALERT! If you want to access device registers with a
* specific size, then the read/write functions have to
* make sure to do the correct sized pointer access.
*/
/*
* Read bytes from kernel address space for debugger.
* This used to check for valid PTEs, but now that
* traps in DDB work correctly, "Just Do It!"
*/
void
db_read_bytes(addr, size, data)
vm_offset_t addr;
register int size;
register char *data;
{
register char *src;
register char incr;
#ifdef DEBUG
if (db_machdep_debug)
printf("db_read_bytes: addr=0x%x, size=%d\n", addr, size);
#endif
if (size == 4) {
*((int*)data) = *((int*)addr);
return;
}
if (size == 2) {
*((short*)data) = *((short*)addr);
return;
}
src = (char *)addr;
while (size > 0) {
--size;
*data++ = *src++;
}
}
/*
* Write one byte somewhere in kernel text.
* It does not matter if this is slow.
*/
static void
db_write_text(dst, ch)
char *dst;
int ch;
{
int oldpte, tmppte;
vm_offset_t pgva = sun3_trunc_page((long)dst);
extern int cache_size;
/* Flush read-only VAC entry so we'll see the new one. */
#ifdef HAVECACHE
if (cache_size)
cache_flush_page(pgva);
#endif
oldpte = get_pte(pgva);
if ((oldpte & PG_VALID) == 0) {
db_printf(" address 0x%x not a valid page\n", dst);
return;
}
tmppte = oldpte | PG_WRITE | PG_NC;
set_pte(pgva, tmppte);
/* Now we can write in this page of kernel text... */
*dst = (char) ch;
/* Temporary PTE was non-cacheable; no flush needed. */
set_pte(pgva, oldpte);
ICIA();
}
/*
* Write bytes to kernel address space for debugger.
*/
void
db_write_bytes(addr, size, data)
vm_offset_t addr;
int size;
char *data;
{
extern char kernel_text[], etext[] ;
register char *dst = (char *)addr;
#ifdef DEBUG
if (db_machdep_debug)
printf("db_write_bytes: addr=0x%x, size=%d ", addr, size);
#endif
/* If any part is in kernel text, use db_write_text() */
if ((dst < etext) && ((dst + size) > kernel_text)) {
/* This is slow, but is only used for breakpoints. */
#ifdef DEBUG
if (db_machdep_debug)
printf("(in text)\n");
#endif
while (size > 0) {
--size;
db_write_text(dst, *data);
dst++; data++;
}
return;
}
#ifdef DEBUG
if (db_machdep_debug)
printf("(in data)\n");
#endif
if (size == 4) {
*((int*)addr) = *((int*)data);
return;
}
if (size == 2) {
*((short*)addr) = *((short*)data);
return;
}
while (size > 0) {
--size;
*dst++ = *data++;
}
}
static char *pgt_names[] = {
"MEM", "OBIO", "VMES", "VMEL" };