160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
/* Print NS 32000 instructions for GDB, the GNU debugger.
|
|
Copyright 1986, 1988, 1991, 1992, 1994, 1995
|
|
Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
#include "defs.h"
|
|
|
|
void
|
|
_initialize_ns32k_tdep ()
|
|
{
|
|
tm_print_insn = print_insn_ns32k;
|
|
}
|
|
|
|
static int
|
|
bit_extract (buffer, offset, count)
|
|
char *buffer;
|
|
int offset;
|
|
int count;
|
|
{
|
|
int result;
|
|
int mask;
|
|
int bit;
|
|
|
|
buffer += offset >> 3;
|
|
offset &= 7;
|
|
bit = 1;
|
|
result = 0;
|
|
while (count--)
|
|
{
|
|
if ((*buffer & (1 << offset)))
|
|
result |= bit;
|
|
if (++offset == 8)
|
|
{
|
|
offset = 0;
|
|
buffer++;
|
|
}
|
|
bit <<= 1;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
invalid_float(p, len)
|
|
register char *p;
|
|
register int len;
|
|
{
|
|
register val;
|
|
|
|
if ( len == 4 )
|
|
val = (bit_extract(p, 23, 8)/*exponent*/ == 0xff
|
|
|| (bit_extract(p, 23, 8)/*exponent*/ == 0 &&
|
|
bit_extract(p, 0, 23)/*mantisa*/ != 0));
|
|
else if ( len == 8 )
|
|
val = (bit_extract(p, 52, 11)/*exponent*/ == 0x7ff
|
|
|| (bit_extract(p, 52, 11)/*exponent*/ == 0
|
|
&& (bit_extract(p, 0, 32)/*low mantisa*/ != 0
|
|
|| bit_extract(p, 32, 20)/*high mantisa*/ != 0)));
|
|
else
|
|
val = 1;
|
|
return (val);
|
|
}
|
|
|
|
sign_extend (value, bits)
|
|
{
|
|
value = value & ((1 << bits) - 1);
|
|
return (value & (1 << (bits-1))
|
|
? value | (~((1 << bits) - 1))
|
|
: value);
|
|
}
|
|
|
|
void
|
|
flip_bytes (ptr, count)
|
|
char *ptr;
|
|
int count;
|
|
{
|
|
char tmp;
|
|
|
|
while (count > 0)
|
|
{
|
|
tmp = *ptr;
|
|
ptr[0] = ptr[count-1];
|
|
ptr[count-1] = tmp;
|
|
ptr++;
|
|
count -= 2;
|
|
}
|
|
}
|
|
|
|
/* Return the number of locals in the current frame given a pc
|
|
pointing to the enter instruction. This is used in the macro
|
|
FRAME_FIND_SAVED_REGS. */
|
|
|
|
int
|
|
ns32k_localcount (enter_pc)
|
|
CORE_ADDR enter_pc;
|
|
{
|
|
unsigned char localtype;
|
|
int localcount;
|
|
|
|
localtype = read_memory_integer (enter_pc+2, 1);
|
|
if ((localtype & 0x80) == 0)
|
|
localcount = localtype;
|
|
else if ((localtype & 0xc0) == 0x80)
|
|
localcount = (((localtype & 0x3f) << 8)
|
|
| (read_memory_integer (enter_pc+3, 1) & 0xff));
|
|
else
|
|
localcount = (((localtype & 0x3f) << 24)
|
|
| ((read_memory_integer (enter_pc+3, 1) & 0xff) << 16)
|
|
| ((read_memory_integer (enter_pc+4, 1) & 0xff) << 8 )
|
|
| (read_memory_integer (enter_pc+5, 1) & 0xff));
|
|
return localcount;
|
|
}
|
|
|
|
/*
|
|
* Get the address of the enter opcode for the function
|
|
* containing PC, if there is an enter for the function,
|
|
* and if the pc is between the enter and exit.
|
|
* Returns positive address if pc is between enter/exit,
|
|
* 1 if pc before enter or after exit, 0 otherwise.
|
|
*/
|
|
|
|
CORE_ADDR
|
|
ns32k_get_enter_addr (pc)
|
|
CORE_ADDR pc;
|
|
{
|
|
CORE_ADDR enter_addr;
|
|
unsigned char op;
|
|
|
|
if (pc == 0)
|
|
return 0;
|
|
|
|
if (ABOUT_TO_RETURN (pc))
|
|
return 1; /* after exit */
|
|
|
|
enter_addr = get_pc_function_start (pc);
|
|
|
|
if (pc == enter_addr)
|
|
return 1; /* before enter */
|
|
|
|
op = read_memory_integer (enter_addr, 1);
|
|
|
|
if (op != 0x82)
|
|
return 0; /* function has no enter/exit */
|
|
|
|
return enter_addr; /* pc is between enter and exit */
|
|
}
|