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binutils-gdb/sim/ppc/emul_bugapi.c

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/* This file is part of the program psim.
Copyright (C) 1994-1997, 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _EMUL_BUGAPI_C_
#define _EMUL_BUGAPI_C_
/* Note: this module is called via a table. There is no benefit in
making it inline */
#include "emul_generic.h"
#include "emul_bugapi.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif
/* EMULATION
BUG - Motorola's embeded firmware BUG interface
DESCRIPTION
*/
/* from PowerPCBug Debugging Package User's Manual, part 2 of 2 and also bug.S - Dale Rahn */
#define _INCHR 0x000 /* Input character */
#define _INSTAT 0x001 /* Input serial port status */
#define _INLN 0x002 /* Input line (pointer / pointer format) */
#define _READSTR 0x003 /* Input string (pointer / count format) */
#define _READLN 0x004 /* Input line (pointer / count format) */
#define _CHKBRK 0x005 /* Check for break */
#define _DSKRD 0x010 /* Disk read */
#define _DSKWR 0x011 /* Disk write */
#define _DSKCFIG 0x012 /* Disk configure */
#define _DSKFMT 0x014 /* Disk format */
#define _DSKCTRL 0x015 /* Disk control */
#define _NETRD 0x018 /* Read from host */
#define _NETWR 0x019 /* Write to host */
#define _NETCFIG 0x01a /* Configure network parameters */
#define _NETOPN 0x01b /* Open file for reading */
#define _NETFRD 0x01c /* Retreive specified file blocks */
#define _NETCTRL 0x01d /* Implement special control functions */
#define _OUTCHR 0x020 /* Output character (pointer / pointer format) */
#define _OUTSTR 0x021 /* Output string (pointer / pointer format) */
#define _OUTLN 0x022 /* Output line (pointer / pointer format) */
#define _WRITE 0x023 /* Output string (pointer / count format) */
#define _WRITELN 0x024 /* Output line (pointer / count format) */
#define _WRITDLN 0x025 /* Output line with data (pointer / count format) */
#define _PCRLF 0x026 /* Output carriage return and line feed */
#define _ERASLN 0x027 /* Erase line */
#define _WRITD 0x028 /* Output string with data (pointer / count format) */
#define _SNDBRK 0x029 /* Send break */
#define _DELAY 0x043 /* Timer delay */
#define _RTC_TM 0x050 /* Time initialization for RTC */
#define _RTC_DT 0x051 /* Date initialization for RTC */
#define _RTC_DSP 0x052 /* Display RTC time and date */
#define _RTC_RD 0x053 /* Read the RTC registers */
#define _REDIR 0x060 /* Redirect I/O of a system call function */
#define _REDIR_I 0x061 /* Redirect input */
#define _REDIR_O 0x062 /* Redirect output */
#define _RETURN 0x063 /* Return to PPCbug */
#define _BINDEC 0x064 /* Convert binary to binary coded decimal (BCD) */
#define _CHANGEV 0x067 /* Parse value */
#define _STRCMP 0x068 /* Compare two strings (pointer / count format) */
#define _MULU32 0x069 /* Multiply two 32-bit unsigned integers */
#define _DIVU32 0x06a /* Divide two 32-bit unsigned integers */
#define _CHK_SUM 0x06b /* Generate checksum */
#define _BRD_ID 0x070 /* Return pointer to board ID packet */
#define _ENVIRON 0x071 /* Access boot environment parameters */
#define _DIAGFCN 0x074 /* Diagnostic function(s) */
#define _SIOPEPS 0x090 /* Retrieve SCSI pointers */
#define _IOINQ 0x120 /* Port inquire */
#define _IOINFORM 0x124 /* Port inform */
#define _IOCONFIG 0x128 /* Port configure */
#define _IODELETE 0x12c /* Port delete */
#define _SYMBOLTA 0x130 /* Attach symbol table */
#define _SYMBOLDA 0x131 /* Detach symbol table */
struct bug_map {
int value;
const char *info;
};
static const struct bug_map bug_mapping[] = {
{ _INCHR, ".INCHR -- Input character" },
{ _INSTAT, ".INSTAT -- Input serial port status" },
{ _INLN, ".INLN -- Input line (pointer / pointer format)" },
{ _READSTR, ".READSTR -- Input string (pointer / count format)" },
{ _READLN, ".READLN -- Input line (pointer / count format)" },
{ _CHKBRK, ".CHKBRK -- Check for break" },
{ _DSKRD, ".DSKRD -- Disk read" },
{ _DSKWR, ".DSKWR -- Disk write" },
{ _DSKCFIG, ".DSKCFIG -- Disk configure" },
{ _DSKFMT, ".DSKFMT -- Disk format" },
{ _DSKCTRL, ".DSKCTRL -- Disk control" },
{ _NETRD, ".NETRD -- Read from host" },
{ _NETWR, ".NETWR -- Write to host" },
{ _NETCFIG, ".NETCFIG -- Configure network parameters" },
{ _NETOPN, ".NETOPN -- Open file for reading" },
{ _NETFRD, ".NETFRD -- Retreive specified file blocks" },
{ _NETCTRL, ".NETCTRL -- Implement special control functions" },
{ _OUTCHR, ".OUTCHR -- Output character" },
{ _OUTSTR, ".OUTSTR -- Output string (pointer / pointer format)" },
{ _OUTLN, ".OUTLN -- Output line (pointer / pointer format)" },
{ _WRITE, ".WRITE -- Output string (pointer / count format)" },
{ _WRITELN, ".WRITELN -- Output line (pointer / count format)" },
{ _WRITDLN, ".WRITDLN -- Output line with data (pointer / count format)" },
{ _PCRLF, ".PCRLF -- Output carriage return and line feed" },
{ _ERASLN, ".ERASLN -- Erase line" },
{ _WRITD, ".WRITD -- Output string with data (pointer / count format)" },
{ _SNDBRK, ".SNDBRK -- Send break" },
{ _DELAY, ".DELAY -- Timer delay" },
{ _RTC_TM, ".RTC_TM -- Time initialization for RTC" },
{ _RTC_DT, ".RTC_DT -- Date initialization for RTC" },
{ _RTC_DSP, ".RTC_DSP -- Display RTC time and date" },
{ _RTC_RD, ".RTC_RD -- Read the RTC registers" },
{ _REDIR, ".REDIR -- Redirect I/O of a system call function" },
{ _REDIR, ".REDIR -- Redirect input" },
{ _REDIR, ".REDIR -- Redirect output" },
{ _RETURN, ".RETURN -- Return to PPCbug" },
{ _BINDEC, ".BINDEC -- Convert binary to binary coded decimal (BCD)" },
{ _CHANGEV, ".CHANGEV -- Parse value" },
{ _STRCMP, ".STRCMP -- Compare two strings (pointer / count format)" },
{ _MULU32, ".MULU32 -- Multiply two 32-bit unsigned integers" },
{ _DIVU32, ".DIVU32 -- Divide two 32-bit unsigned integers" },
{ _CHK_SUM, ".CHK_SUM -- Generate checksum" },
{ _BRD_ID, ".BRD_ID -- Return pointer to board ID packet" },
{ _ENVIRON, ".ENVIRON -- Access boot environment parameters" },
{ _DIAGFCN, ".DIAGFCN -- Diagnostic function(s)" },
{ _SIOPEPS, ".SIOPEPS -- Retrieve SCSI pointers" },
{ _IOINQ, ".IOINQ -- Port inquire" },
{ _IOINFORM, ".IOINFORM -- Port inform" },
{ _IOCONFIG, ".IOCONFIG -- Port configure" },
{ _IODELETE, ".IODELETE -- Port delete" },
{ _SYMBOLTA, ".SYMBOLTA -- Attach symbol table" },
{ _SYMBOLDA, ".SYMBOLDA -- Detach symbol table" },
};
#ifndef BUGAPI_END_ADDRESS
#define BUGAPI_END_ADDRESS 0x100000
#endif
enum {
nr_bugapi_disks = 2,
};
struct _os_emul_data {
device *root;
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;
/* I/O devices */
device_instance *output;
device_instance *input;
device_instance *(disk[nr_bugapi_disks]);
};
static os_emul_data *
emul_bugapi_create(device *root,
bfd *image,
const char *name)
{
device *node;
os_emul_data *bugapi;
char *filename;
/* 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) >= BUGAPI_END_ADDRESS)
return NULL;
bugapi = ZALLOC(os_emul_data);
/* options */
emul_add_tree_options(root, image, "bug", "oea",
1 /*oea-interrupt-prefix*/);
/* add some real hardware, include eeprom memory for the eeprom trap
addresses */
emul_add_tree_hardware(root);
node = tree_parse(root, "/openprom/memory@0xfff00000");
tree_parse(node, "./psim,description \"eeprom trap addresses");
tree_parse(node, "./reg 0xfff00000 0x3000");
bugapi->root = root;
bugapi->memory_size
= tree_find_integer_property(root, "/openprom/options/oea-memory-size");
bugapi->interrupt_prefix =
tree_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
= tree_find_boolean_property(root, "/options/little-endian?");
bugapi->floating_point_available
= tree_find_boolean_property(root, "/openprom/options/floating-point?");
bugapi->input = NULL;
bugapi->output = NULL;
/* initialization */
if (image != NULL)
tree_parse(root, "/openprom/init/register/0.pc 0x%lx",
(unsigned long)bfd_get_start_address(image));
tree_parse(root, "/openprom/init/register/pc 0x%lx",
(unsigned long)bugapi->stall_cpu_loop_address);
tree_parse(root, "/openprom/init/register/sp 0x%lx",
(unsigned long)(bugapi->top_of_stack - 16));
tree_parse(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 = tree_parse(root, "/openprom/init/data@0x%lx",
(unsigned long)bugapi->system_call_address);
tree_parse(node, "./psim,description \"system-call trap instruction");
tree_parse(node, "./real-address 0x%lx",
(unsigned long)bugapi->system_call_address);
tree_parse(node, "./data 0x%x", emul_call_instruction);
node = tree_parse(root, "/openprom/init/data@0x%lx",
(unsigned long)bugapi->system_call_address + 4);
tree_parse(node, "./psim,description \"return from interrupt instruction");
tree_parse(node, "./real-address 0x%lx",
(unsigned long)bugapi->system_call_address + 4);
tree_parse(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 = tree_parse(root, "/openprom/init/data@0x%lx",
(unsigned long)bugapi->stall_cpu_loop_address);
tree_parse(node, "./psim,description \"cpu-loop instruction");
tree_parse(node, "./real-address 0x%lx",
(unsigned long)bugapi->stall_cpu_loop_address);
tree_parse(node, "./data 0x%lx",
(unsigned long)emul_loop_instruction);
if (image != NULL)
tree_parse(root, "/openprom/init/stack/stack-type %s",
(image->xvec->flavour == bfd_target_elf_flavour
? "ppc-elf"
: "ppc-xcoff"));
if (image != NULL)
{
filename = tree_quote_property (bfd_get_filename(image));
tree_parse(root, "/openprom/init/load-binary/file-name %s",
filename);
free (filename);
}
return bugapi;
}
static void
emul_bugapi_init(os_emul_data *bugapi,
int nr_cpus)
{
int i;
/* get the current input/output devices that were created during
device tree initialization */
bugapi->input = tree_find_ihandle_property(bugapi->root, "/chosen/stdin");
bugapi->output = tree_find_ihandle_property(bugapi->root, "/chosen/stdout");
/* if present, extract the selected disk devices */
for (i = 0; i < nr_bugapi_disks; i++) {
char disk[32];
char *chp;
strcpy(disk, "/chosen/disk0");
ASSERT(sizeof(disk) > strlen(disk));
chp = strchr(disk, '0');
*chp = *chp + i;
if (tree_find_property(bugapi->root, disk) != NULL)
bugapi->disk[i] = tree_find_ihandle_property(bugapi->root, disk);
}
}
static const char *
emul_bugapi_instruction_name(int call_id)
{
static char buffer[40];
int i;
for (i = 0; i < ARRAY_SIZE (bug_mapping); i++)
{
if (bug_mapping[i].value == call_id)
return bug_mapping[i].info;
}
(void) sprintf (buffer, "Unknown bug call 0x%x", call_id);
return buffer;
}
static int
emul_bugapi_do_read(os_emul_data *bugapi,
cpu *processor,
unsigned_word cia,
unsigned_word buf,
int nbytes)
{
unsigned char *scratch_buffer;
int status;
/* get a tempoary bufer */
scratch_buffer = (unsigned char *) zalloc(nbytes);
/* check if buffer exists by reading it */
emul_read_buffer((void *)scratch_buffer, buf, nbytes, processor, cia);
/* read */
status = device_instance_read(bugapi->input,
(void *)scratch_buffer, nbytes);
/* -1 = error, -2 = nothing available - see "serial" [IEEE1275] */
if (status < 0) {
status = 0;
}
if (status > 0) {
emul_write_buffer((void *)scratch_buffer, buf, status, processor, cia);
/* Bugapi chops off the trailing n, but leaves it in the buffer */
if (scratch_buffer[status-1] == '\n' || scratch_buffer[status-1] == '\r')
status--;
}
free(scratch_buffer);
return status;
}
static void
emul_bugapi_do_diskio(os_emul_data *bugapi,
cpu *processor,
unsigned_word cia,
unsigned_word descriptor_addr,
int call_id)
{
struct dskio_descriptor {
unsigned_1 ctrl_lun;
unsigned_1 dev_lun;
unsigned_2 status;
unsigned_word pbuffer;
unsigned_4 blk_num;
unsigned_2 blk_cnt;
unsigned_1 flag;
#define BUG_FILE_MARK 0x80
#define IGNORE_FILENUM 0x02
#define END_OF_FILE 0x01
unsigned_1 addr_mod;
} descriptor;
int block;
emul_read_buffer(&descriptor, descriptor_addr, sizeof(descriptor),
processor, cia);
T2H(descriptor.ctrl_lun);
T2H(descriptor.dev_lun);
T2H(descriptor.status);
T2H(descriptor.pbuffer);
T2H(descriptor.blk_num);
T2H(descriptor.blk_cnt);
T2H(descriptor.flag);
T2H(descriptor.addr_mod);
if (descriptor.dev_lun >= nr_bugapi_disks
|| bugapi->disk[descriptor.dev_lun] == NULL) {
error("emul_bugapi_do_diskio: attempt to access unconfigured disk /chosen/disk%d",
descriptor.dev_lun);
}
else {
for (block = 0; block < descriptor.blk_cnt; block++) {
device_instance *disk = bugapi->disk[descriptor.dev_lun];
unsigned_1 buf[512]; /*????*/
unsigned_word block_nr = descriptor.blk_num + block;
unsigned_word byte_nr = block_nr * sizeof(buf);
unsigned_word block_addr = descriptor.pbuffer + block*sizeof(buf);
if (device_instance_seek(disk, 0, byte_nr) < 0)
error("emul_bugapi_do_diskio: bad seek\n");
switch (call_id) {
case _DSKRD:
if (device_instance_read(disk, buf, sizeof(buf)) != sizeof(buf))
error("emul_`bugapi_do_diskio: bad read\n");
emul_write_buffer(buf, block_addr, sizeof(buf), processor, cia);
break;
case _DSKWR:
emul_read_buffer(buf, block_addr, sizeof(buf), processor, cia);
if (device_instance_write(disk, buf, sizeof(buf)) != sizeof(buf))
error("emul_bugapi_do_diskio: bad write\n");
break;
default:
error("emul_bugapi_do_diskio: bad switch\n");
}
}
}
}
static void
emul_bugapi_do_write(os_emul_data *bugapi,
cpu *processor,
unsigned_word cia,
unsigned_word buf,
int nbytes,
const char *suffix)
{
void *scratch_buffer = NULL;
/* get a tempoary bufer */
if (nbytes > 0)
{
scratch_buffer = zalloc(nbytes);
/* copy in */
emul_read_buffer(scratch_buffer, buf, nbytes,
processor, cia);
/* write */
device_instance_write(bugapi->output, scratch_buffer, nbytes);
free(scratch_buffer);
}
if (suffix)
device_instance_write(bugapi->output, suffix, strlen(suffix));
flush_stdoutput ();
}
static int
emul_bugapi_instruction_call(cpu *processor,
unsigned_word cia,
unsigned_word ra,
os_emul_data *bugapi)
{
const int call_id = cpu_registers(processor)->gpr[10];
unsigned char uc;
#define MY_INDEX itable_instruction_call
ITRACE (trace_os_emul,
(" 0x%x %s, r3 = 0x%lx, r4 = 0x%lx\n",
call_id, emul_bugapi_instruction_name (call_id),
(long)cpu_registers(processor)->gpr[3],
(long)cpu_registers(processor)->gpr[4]));;
/* check that this isn't an invalid instruction */
if (cia != bugapi->system_call_address)
return 0;
switch (call_id) {
default:
error("emul-bugapi: unimplemented bugapi %s from address 0x%lx\n",
emul_bugapi_instruction_name (call_id), SRR0);
break;
/* read a single character, output r3 = byte */
/* FIXME: Add support to unbuffer input */
case _INCHR:
if (device_instance_read(bugapi->input, (void *)&uc, 1) <= 0)
uc = 0;
cpu_registers(processor)->gpr[3] = uc;
break;
/* read a line of at most 256 bytes, r3 = ptr to 1st byte, output r3 = ptr to last byte+1 */
case _INLN:
cpu_registers(processor)->gpr[3] += emul_bugapi_do_read(bugapi,
processor, cia,
cpu_registers(processor)->gpr[3],
256);
break;
/* output a character, r3 = character */
case _OUTCHR:
{
char out = (char)cpu_registers(processor)->gpr[3];
device_instance_write(bugapi->output, &out, 1);
break;
}
/* output a string, r3 = ptr to 1st byte, r4 = ptr to last byte+1 */
case _OUTSTR:
emul_bugapi_do_write(bugapi,
processor, cia,
cpu_registers(processor)->gpr[3],
cpu_registers(processor)->gpr[4] - cpu_registers(processor)->gpr[3],
(const char *)0);
break;
/* output a string followed by \r\n, r3 = ptr to 1st byte, r4 = ptr to last byte+1 */
case _OUTLN:
emul_bugapi_do_write(bugapi,
processor, cia,
cpu_registers(processor)->gpr[3],
cpu_registers(processor)->gpr[4] - cpu_registers(processor)->gpr[3],
"\n");
break;
/* output a \r\n */
case _PCRLF:
device_instance_write(bugapi->output, "\n", 1);
break;
/* read/write blocks of data to/from the disk */
case _DSKWR:
case _DSKRD:
emul_bugapi_do_diskio(bugapi, processor, cia,
cpu_registers(processor)->gpr[3],
call_id);
break;
/* return to ppcbug monitor (exiting with gpr[3] as status is not
part of the bug monitor) */
case _RETURN:
cpu_halt(processor, cia, was_exited, cpu_registers(processor)->gpr[3]);
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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