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/* This file is part of the program psim.
Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
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.
*/
#ifndef _EMUL_BUGAPI_C_
#define _EMUL_BUGAPI_C_
/* from bug.S - Dale Rahn */
#define _INCHR 0x00
#define _INSTAT 0x01
#define _INLN 0x02
#define _READSTR 0x03
#define _READLN 0x04
#define _OUTCHR 0x20
#define _OUTSTR 0x21
#define _OUTLN 0x22
#define _DSKRD 0x10
#define _DSKWR 0x11
#define _DSKCFIG 0x12
#define _DSKFMT 0x14
#define _DSKCTRL 0x15
#define _WRITE 0x23
#define _WRITELN 0x24
#define _DELAY 0x43
#define _RTC_RD 0x53
#define _RETURN 0x63
#define _BRD_ID 0x70
/* Note: this module is called via a table. There is no benefit in
making it inline */
#include "emul_generic.h"
#include "emul_bugapi.h"
#ifndef OEA_START_ADDRESS
#define OEA_START_ADDRESS 0x100000
#endif
struct _os_emul_data {
unsigned_word memory_size;
unsigned_word top_of_stack;
int interrupt_prefix;
unsigned_word interrupt_vector_address;
unsigned_word system_call_address;
unsigned_word stall_cpu_loop_address;
int little_endian;
int floating_point_available;
};
static os_emul_data *
emul_bugapi_create(device *root,
bfd *image,
const char *name)
{
int elf_binary;
device *node;
os_emul_data *bugapi;
/* check it really is for us */
if (name != NULL
&& strcmp(name, "bugapi") != 0
&& strcmp(name, "bug") != 0)
return NULL;
if (image != NULL
&& name == NULL
&& bfd_get_start_address(image) > OEA_START_ADDRESS)
return NULL;
bugapi = ZALLOC(os_emul_data);
/* some defaults */
elf_binary = image->xvec->flavour == bfd_target_elf_flavour;
/* options */
emul_add_tree_options(root, image, "bug", "oea",
1 /*oea-interrupt-prefix*/);
/* add some real hardware */
emul_add_tree_hardware(root);
bugapi->memory_size
= device_find_integer_property(root, "/openprom/options/oea-memory-size");
bugapi->interrupt_prefix =
device_find_integer_property(root, "/openprom/options/oea-interrupt-prefix");
bugapi->interrupt_vector_address = (bugapi->interrupt_prefix
? MASK(0, 43)
: 0);
bugapi->system_call_address = (bugapi->interrupt_vector_address + 0x00c00);
bugapi->stall_cpu_loop_address = (bugapi->system_call_address + 0x000f0);
bugapi->top_of_stack = bugapi->memory_size - 0x1000;
bugapi->little_endian
= device_find_boolean_property(root, "/options/little-endian?");
bugapi->floating_point_available
= device_find_boolean_property(root, "/openprom/options/floating-point?");
/* initialization */
device_tree_add_parsed(root, "/openprom/init/register/0.pc 0x%lx",
(unsigned long)bfd_get_start_address(image));
device_tree_add_parsed(root, "/openprom/init/register/pc 0x%lx",
(unsigned long)bugapi->stall_cpu_loop_address);
device_tree_add_parsed(root, "/openprom/init/register/sp 0x%lx",
(unsigned long)(bugapi->top_of_stack - 16));
device_tree_add_parsed(root, "/openprom/init/register/msr 0x%x",
(msr_recoverable_interrupt
| (bugapi->little_endian
? (msr_little_endian_mode
| msr_interrupt_little_endian_mode)
: 0)
| (bugapi->floating_point_available
? msr_floating_point_available
: 0)
| (bugapi->interrupt_prefix
? msr_interrupt_prefix
: 0)
));
/* patch the system call instruction to call this emulation and then
do an rfi */
node = device_tree_add_parsed(root, "/openprom/init/data@0x%lx",
(long)bugapi->system_call_address);
device_tree_add_parsed(node, "./real-address 0x%lx",
(long)bugapi->system_call_address);
device_tree_add_parsed(node, "./data 0x%x",
emul_call_instruction);
node = device_tree_add_parsed(root, "/openprom/init/data@0x%lx",
(long)(bugapi->system_call_address + 4));
device_tree_add_parsed(node, "./real-address 0x%lx",
(long)(bugapi->system_call_address + 4));
device_tree_add_parsed(node, "./data 0x%x",
emul_rfi_instruction);
/* patch the end of the system call instruction so that it contains
a loop to self instruction and point all the cpu's at this */
node = device_tree_add_parsed(root, "/openprom/init/data@0x%lx",
(unsigned long)bugapi->stall_cpu_loop_address);
device_tree_add_parsed(node, "./real-address 0x%lx",
(unsigned long)bugapi->stall_cpu_loop_address);
device_tree_add_parsed(node, "./data 0x%lx",
(unsigned long)emul_loop_instruction);
device_tree_add_parsed(root, "/openprom/init/stack/stack-type %s",
elf_binary ? "elf" : "aix");
device_tree_add_parsed(root, "/openprom/init/load-binary/file-name \"%s",
bfd_get_filename(image));
return bugapi;
}
static void
emul_bugapi_init(os_emul_data *emul_data,
int nr_cpus)
{
/* nothing happens here */
}
static int
emul_bugapi_instruction_call(cpu *processor,
unsigned_word cia,
unsigned_word ra,
os_emul_data *emul_data)
{
const int call_id = cpu_registers(processor)->gpr[10];
/* check that this isn't an invalid instruction */
if (cia != emul_data->system_call_address)
return 0;
switch (call_id) {
case _OUTCHR:
printf_filtered("%c", (char)cpu_registers(processor)->gpr[3]);
break;
case _OUTLN:
printf_filtered("\n");
break;
case _RETURN:
cpu_halt(processor, cia, was_exited, 0); /* always succeeds */
break;
default:
error("emul-bugapi: unimplemented bugapi call 0x%x from address 0x%lx\n",
call_id, SRR0);
break;
}
return 1;
/* the instruction following this one is a RFI. Thus by just
continuing the return from system call is performed */
}
const os_emul emul_bugapi = {
"bugapi",
emul_bugapi_create,
emul_bugapi_init,
0, /*system_call*/
emul_bugapi_instruction_call,
0 /*data*/
};
#endif
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