binutils-gdb/opcodes/arc-ext.c

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/* ARC target-dependent stuff. Extension structure access functions
Copyright (C) 1995, 1997, 2000 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 <stdlib.h>
#include <stdio.h>
#include "bfd.h"
#include "arc-ext.h"
#include "libiberty.h"
/* Extension structure */
static struct arcExtMap arc_extension_map;
/* Get the name of an extension instruction. */
const char *
arcExtMap_instName(int opcode, int minor, int *flags)
{
if (opcode == 3)
{
/* FIXME: ??? need to also check 0/1/2 in bit0 for (3f) brk/sleep/swi */
if (minor < 0x09 || minor == 0x3f)
return 0;
else
opcode = 0x1f - 0x10 + minor - 0x09 + 1;
}
else
if (opcode < 0x10)
return 0;
else
opcode -= 0x10;
if (!arc_extension_map.instructions[opcode])
return 0;
*flags = arc_extension_map.instructions[opcode]->flags;
return arc_extension_map.instructions[opcode]->name;
}
/* Get the name of an extension core register. */
const char *
arcExtMap_coreRegName(int value)
{
if (value < 32)
return 0;
return (const char *) arc_extension_map.coreRegisters[value-32];
}
/* Get the name of an extension condition code. */
const char *
arcExtMap_condCodeName(int value)
{
if (value < 16)
return 0;
return (const char *) arc_extension_map.condCodes[value-16];
}
/* Get the name of an extension aux register. */
const char *
arcExtMap_auxRegName(long address)
{
/* walk the list of aux reg names and find the name */
struct ExtAuxRegister *r;
for (r = arc_extension_map.auxRegisters; r; r = r->next) {
if (r->address == address)
return (const char *) r->name;
}
return 0;
}
/* Recursively free auxilliary register strcture pointers until
the list is empty. */
static void
clean_aux_registers(struct ExtAuxRegister *r)
{
if (r -> next)
{
clean_aux_registers( r->next);
free(r -> name);
free(r -> next);
r ->next = NULL;
}
else
free(r -> name);
}
/* Free memory that has been allocated for the extensions. */
static void
cleanup_ext_map(void)
{
struct ExtAuxRegister *r;
struct ExtInstruction *insn;
int i;
/* clean aux reg structure */
r = arc_extension_map.auxRegisters;
if (r)
{
(clean_aux_registers(r));
free(r);
}
/* clean instructions */
for (i = 0; i < NUM_EXT_INST; i++)
{
insn = arc_extension_map.instructions[i];
if (insn)
free(insn->name);
}
/* clean core reg struct */
for (i = 0; i < NUM_EXT_CORE; i++)
{
if (arc_extension_map.coreRegisters[i])
free(arc_extension_map.coreRegisters[i]);
}
for (i = 0; i < NUM_EXT_COND; i++) {
if (arc_extension_map.condCodes[i])
free(arc_extension_map.condCodes[i]);
}
memset(&arc_extension_map, 0, sizeof(struct arcExtMap));
}
int
arcExtMap_add(void *base, unsigned long length)
{
unsigned char *block = base;
unsigned char *p = block;
/* Clean up and reset everything if needed. */
cleanup_ext_map();
while (p && p < (block + length))
{
/* p[0] == length of record
p[1] == type of record
For instructions:
p[2] = opcode
p[3] = minor opcode (if opcode == 3)
p[4] = flags
p[5]+ = name
For core regs and condition codes:
p[2] = value
p[3]+ = name
For aux regs:
p[2..5] = value
p[6]+ = name
(value is p[2]<<24|p[3]<<16|p[4]<<8|p[5]) */
if (p[0] == 0)
return -1;
switch (p[1])
{
case EXT_INSTRUCTION:
{
char opcode = p[2];
char minor = p[3];
char * insn_name = (char *) xmalloc(( (int)*p-5) * sizeof(char));
struct ExtInstruction * insn =
(struct ExtInstruction *) xmalloc(sizeof(struct ExtInstruction));
if (opcode==3)
opcode = 0x1f - 0x10 + minor - 0x09 + 1;
else
opcode -= 0x10;
insn -> flags = (char) *(p+4);
strcpy(insn_name, (p+5));
insn -> name = insn_name;
arc_extension_map.instructions[(int) opcode] = insn;
}
break;
case EXT_CORE_REGISTER:
{
char * core_name = (char *) xmalloc(((int)*p-3) * sizeof(char));
strcpy(core_name, (p+3));
arc_extension_map.coreRegisters[p[2]-32] = core_name;
}
break;
case EXT_COND_CODE:
{
char * cc_name = (char *) xmalloc( ((int)*p-3) * sizeof(char));
strcpy(cc_name, (p+3));
arc_extension_map.condCodes[p[2]-16] = cc_name;
}
break;
case EXT_AUX_REGISTER:
{
/* trickier -- need to store linked list to these */
struct ExtAuxRegister *newAuxRegister =
(struct ExtAuxRegister *)malloc(sizeof(struct ExtAuxRegister));
char * aux_name = (char *) xmalloc ( ((int)*p-6) * sizeof(char));
strcpy (aux_name, (p+6));
newAuxRegister->name = aux_name;
newAuxRegister->address = p[2]<<24 | p[3]<<16 | p[4]<<8 | p[5];
newAuxRegister->next = arc_extension_map.auxRegisters;
arc_extension_map.auxRegisters = newAuxRegister;
}
break;
default:
return -1;
}
p += p[0]; /* move to next record */
}
return 0;
}
/* Load hw extension descibed in .extArcMap ELF section. */
void
build_ARC_extmap (text_bfd)
bfd *text_bfd;
{
char *arcExtMap;
bfd_size_type count;
asection *p;
for (p = text_bfd->sections; p != NULL; p = p->next)
if (!strcmp (p->name, ".arcextmap"))
{
count = p->_raw_size;
arcExtMap = (char *) xmalloc (count);
if (bfd_get_section_contents (text_bfd, p, (PTR) arcExtMap, 0, count))
{
arcExtMap_add ((PTR) arcExtMap, count);
break;
}
free ((PTR) arcExtMap);
}
}