575 lines
19 KiB
C
575 lines
19 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _EMUL_BUGAPI_C_
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#define _EMUL_BUGAPI_C_
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/* Note: this module is called via a table. There is no benefit in
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making it inline */
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#include "emul_generic.h"
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#include "emul_bugapi.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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/* EMULATION
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BUG - Motorola's embeded firmware BUG interface
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DESCRIPTION
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*/
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/* from PowerPCBug Debugging Package User's Manual, part 2 of 2 and also bug.S - Dale Rahn */
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#define _INCHR 0x000 /* Input character */
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#define _INSTAT 0x001 /* Input serial port status */
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#define _INLN 0x002 /* Input line (pointer / pointer format) */
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#define _READSTR 0x003 /* Input string (pointer / count format) */
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#define _READLN 0x004 /* Input line (pointer / count format) */
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#define _CHKBRK 0x005 /* Check for break */
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#define _DSKRD 0x010 /* Disk read */
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#define _DSKWR 0x011 /* Disk write */
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#define _DSKCFIG 0x012 /* Disk configure */
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#define _DSKFMT 0x014 /* Disk format */
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#define _DSKCTRL 0x015 /* Disk control */
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#define _NETRD 0x018 /* Read from host */
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#define _NETWR 0x019 /* Write to host */
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#define _NETCFIG 0x01a /* Configure network parameters */
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#define _NETOPN 0x01b /* Open file for reading */
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#define _NETFRD 0x01c /* Retreive specified file blocks */
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#define _NETCTRL 0x01d /* Implement special control functions */
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#define _OUTCHR 0x020 /* Output character (pointer / pointer format) */
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#define _OUTSTR 0x021 /* Output string (pointer / pointer format) */
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#define _OUTLN 0x022 /* Output line (pointer / pointer format) */
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#define _WRITE 0x023 /* Output string (pointer / count format) */
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#define _WRITELN 0x024 /* Output line (pointer / count format) */
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#define _WRITDLN 0x025 /* Output line with data (pointer / count format) */
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#define _PCRLF 0x026 /* Output carriage return and line feed */
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#define _ERASLN 0x027 /* Erase line */
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#define _WRITD 0x028 /* Output string with data (pointer / count format) */
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#define _SNDBRK 0x029 /* Send break */
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#define _DELAY 0x043 /* Timer delay */
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#define _RTC_TM 0x050 /* Time initialization for RTC */
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#define _RTC_DT 0x051 /* Date initialization for RTC */
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#define _RTC_DSP 0x052 /* Display RTC time and date */
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#define _RTC_RD 0x053 /* Read the RTC registers */
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#define _REDIR 0x060 /* Redirect I/O of a system call function */
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#define _REDIR_I 0x061 /* Redirect input */
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#define _REDIR_O 0x062 /* Redirect output */
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#define _RETURN 0x063 /* Return to PPCbug */
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#define _BINDEC 0x064 /* Convert binary to binary coded decimal (BCD) */
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#define _CHANGEV 0x067 /* Parse value */
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#define _STRCMP 0x068 /* Compare two strings (pointer / count format) */
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#define _MULU32 0x069 /* Multiply two 32-bit unsigned integers */
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#define _DIVU32 0x06a /* Divide two 32-bit unsigned integers */
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#define _CHK_SUM 0x06b /* Generate checksum */
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#define _BRD_ID 0x070 /* Return pointer to board ID packet */
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#define _ENVIRON 0x071 /* Access boot environment parameters */
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#define _DIAGFCN 0x074 /* Diagnostic function(s) */
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#define _SIOPEPS 0x090 /* Retrieve SCSI pointers */
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#define _IOINQ 0x120 /* Port inquire */
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#define _IOINFORM 0x124 /* Port inform */
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#define _IOCONFIG 0x128 /* Port configure */
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#define _IODELETE 0x12c /* Port delete */
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#define _SYMBOLTA 0x130 /* Attach symbol table */
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#define _SYMBOLDA 0x131 /* Detach symbol table */
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struct bug_map {
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int value;
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const char *info;
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};
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static const struct bug_map bug_mapping[] = {
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{ _INCHR, ".INCHR -- Input character" },
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{ _INSTAT, ".INSTAT -- Input serial port status" },
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{ _INLN, ".INLN -- Input line (pointer / pointer format)" },
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{ _READSTR, ".READSTR -- Input string (pointer / count format)" },
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{ _READLN, ".READLN -- Input line (pointer / count format)" },
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{ _CHKBRK, ".CHKBRK -- Check for break" },
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{ _DSKRD, ".DSKRD -- Disk read" },
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{ _DSKWR, ".DSKWR -- Disk write" },
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{ _DSKCFIG, ".DSKCFIG -- Disk configure" },
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{ _DSKFMT, ".DSKFMT -- Disk format" },
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{ _DSKCTRL, ".DSKCTRL -- Disk control" },
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{ _NETRD, ".NETRD -- Read from host" },
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{ _NETWR, ".NETWR -- Write to host" },
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{ _NETCFIG, ".NETCFIG -- Configure network parameters" },
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{ _NETOPN, ".NETOPN -- Open file for reading" },
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{ _NETFRD, ".NETFRD -- Retreive specified file blocks" },
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{ _NETCTRL, ".NETCTRL -- Implement special control functions" },
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{ _OUTCHR, ".OUTCHR -- Output character" },
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{ _OUTSTR, ".OUTSTR -- Output string (pointer / pointer format)" },
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{ _OUTLN, ".OUTLN -- Output line (pointer / pointer format)" },
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{ _WRITE, ".WRITE -- Output string (pointer / count format)" },
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{ _WRITELN, ".WRITELN -- Output line (pointer / count format)" },
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{ _WRITDLN, ".WRITDLN -- Output line with data (pointer / count format)" },
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{ _PCRLF, ".PCRLF -- Output carriage return and line feed" },
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{ _ERASLN, ".ERASLN -- Erase line" },
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{ _WRITD, ".WRITD -- Output string with data (pointer / count format)" },
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{ _SNDBRK, ".SNDBRK -- Send break" },
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{ _DELAY, ".DELAY -- Timer delay" },
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{ _RTC_TM, ".RTC_TM -- Time initialization for RTC" },
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{ _RTC_DT, ".RTC_DT -- Date initialization for RTC" },
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{ _RTC_DSP, ".RTC_DSP -- Display RTC time and date" },
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{ _RTC_RD, ".RTC_RD -- Read the RTC registers" },
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{ _REDIR, ".REDIR -- Redirect I/O of a system call function" },
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{ _REDIR, ".REDIR -- Redirect input" },
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{ _REDIR, ".REDIR -- Redirect output" },
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{ _RETURN, ".RETURN -- Return to PPCbug" },
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{ _BINDEC, ".BINDEC -- Convert binary to binary coded decimal (BCD)" },
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{ _CHANGEV, ".CHANGEV -- Parse value" },
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{ _STRCMP, ".STRCMP -- Compare two strings (pointer / count format)" },
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{ _MULU32, ".MULU32 -- Multiply two 32-bit unsigned integers" },
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{ _DIVU32, ".DIVU32 -- Divide two 32-bit unsigned integers" },
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{ _CHK_SUM, ".CHK_SUM -- Generate checksum" },
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{ _BRD_ID, ".BRD_ID -- Return pointer to board ID packet" },
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{ _ENVIRON, ".ENVIRON -- Access boot environment parameters" },
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{ _DIAGFCN, ".DIAGFCN -- Diagnostic function(s)" },
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{ _SIOPEPS, ".SIOPEPS -- Retrieve SCSI pointers" },
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{ _IOINQ, ".IOINQ -- Port inquire" },
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{ _IOINFORM, ".IOINFORM -- Port inform" },
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{ _IOCONFIG, ".IOCONFIG -- Port configure" },
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{ _IODELETE, ".IODELETE -- Port delete" },
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{ _SYMBOLTA, ".SYMBOLTA -- Attach symbol table" },
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{ _SYMBOLDA, ".SYMBOLDA -- Detach symbol table" },
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};
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#ifndef BUGAPI_END_ADDRESS
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#define BUGAPI_END_ADDRESS 0x100000
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#endif
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enum {
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nr_bugapi_disks = 2,
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};
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struct _os_emul_data {
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device *root;
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unsigned_word memory_size;
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unsigned_word top_of_stack;
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int interrupt_prefix;
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unsigned_word interrupt_vector_address;
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unsigned_word system_call_address;
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unsigned_word stall_cpu_loop_address;
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int little_endian;
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int floating_point_available;
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/* I/O devices */
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device_instance *output;
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device_instance *input;
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device_instance *(disk[nr_bugapi_disks]);
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};
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static os_emul_data *
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emul_bugapi_create(device *root,
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bfd *image,
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const char *name)
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{
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device *node;
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os_emul_data *bugapi;
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char *filename;
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/* check it really is for us */
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if (name != NULL
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&& strcmp(name, "bugapi") != 0
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&& strcmp(name, "bug") != 0)
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return NULL;
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if (image != NULL
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&& name == NULL
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&& bfd_get_start_address(image) >= BUGAPI_END_ADDRESS)
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return NULL;
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bugapi = ZALLOC(os_emul_data);
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/* options */
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emul_add_tree_options(root, image, "bug", "oea",
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1 /*oea-interrupt-prefix*/);
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/* add some real hardware, include eeprom memory for the eeprom trap
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addresses */
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emul_add_tree_hardware(root);
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node = tree_parse(root, "/openprom/memory@0xfff00000");
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tree_parse(node, "./psim,description \"eeprom trap addresses");
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tree_parse(node, "./reg 0xfff00000 0x3000");
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bugapi->root = root;
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bugapi->memory_size
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= tree_find_integer_property(root, "/openprom/options/oea-memory-size");
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bugapi->interrupt_prefix =
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tree_find_integer_property(root, "/openprom/options/oea-interrupt-prefix");
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bugapi->interrupt_vector_address = (bugapi->interrupt_prefix
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? MASK(0, 43)
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: 0);
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bugapi->system_call_address = (bugapi->interrupt_vector_address + 0x00c00);
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bugapi->stall_cpu_loop_address = (bugapi->system_call_address + 0x000f0);
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bugapi->top_of_stack = bugapi->memory_size - 0x1000;
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bugapi->little_endian
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= tree_find_boolean_property(root, "/options/little-endian?");
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bugapi->floating_point_available
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= tree_find_boolean_property(root, "/openprom/options/floating-point?");
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bugapi->input = NULL;
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bugapi->output = NULL;
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/* initialization */
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if (image != NULL)
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tree_parse(root, "/openprom/init/register/0.pc 0x%lx",
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(unsigned long)bfd_get_start_address(image));
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tree_parse(root, "/openprom/init/register/pc 0x%lx",
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(unsigned long)bugapi->stall_cpu_loop_address);
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tree_parse(root, "/openprom/init/register/sp 0x%lx",
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(unsigned long)(bugapi->top_of_stack - 16));
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tree_parse(root, "/openprom/init/register/msr 0x%x",
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(msr_recoverable_interrupt
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| (bugapi->little_endian
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? (msr_little_endian_mode
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| msr_interrupt_little_endian_mode)
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: 0)
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| (bugapi->floating_point_available
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? msr_floating_point_available
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: 0)
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| (bugapi->interrupt_prefix
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? msr_interrupt_prefix
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: 0)
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));
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/* patch the system call instruction to call this emulation and then
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do an rfi */
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node = tree_parse(root, "/openprom/init/data@0x%lx",
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(unsigned long)bugapi->system_call_address);
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tree_parse(node, "./psim,description \"system-call trap instruction");
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tree_parse(node, "./real-address 0x%lx",
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(unsigned long)bugapi->system_call_address);
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tree_parse(node, "./data 0x%x", emul_call_instruction);
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node = tree_parse(root, "/openprom/init/data@0x%lx",
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(unsigned long)bugapi->system_call_address + 4);
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tree_parse(node, "./psim,description \"return from interrupt instruction");
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tree_parse(node, "./real-address 0x%lx",
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(unsigned long)bugapi->system_call_address + 4);
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tree_parse(node, "./data 0x%x",
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emul_rfi_instruction);
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/* patch the end of the system call instruction so that it contains
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a loop to self instruction and point all the cpu's at this */
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node = tree_parse(root, "/openprom/init/data@0x%lx",
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(unsigned long)bugapi->stall_cpu_loop_address);
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tree_parse(node, "./psim,description \"cpu-loop instruction");
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tree_parse(node, "./real-address 0x%lx",
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(unsigned long)bugapi->stall_cpu_loop_address);
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tree_parse(node, "./data 0x%lx",
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(unsigned long)emul_loop_instruction);
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if (image != NULL)
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tree_parse(root, "/openprom/init/stack/stack-type %s",
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(image->xvec->flavour == bfd_target_elf_flavour
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? "ppc-elf"
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: "ppc-xcoff"));
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if (image != NULL)
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{
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filename = tree_quote_property (bfd_get_filename(image));
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tree_parse(root, "/openprom/init/load-binary/file-name %s",
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filename);
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free (filename);
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}
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return bugapi;
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}
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static void
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emul_bugapi_init(os_emul_data *bugapi,
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int nr_cpus)
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{
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int i;
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/* get the current input/output devices that were created during
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device tree initialization */
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bugapi->input = tree_find_ihandle_property(bugapi->root, "/chosen/stdin");
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bugapi->output = tree_find_ihandle_property(bugapi->root, "/chosen/stdout");
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/* if present, extract the selected disk devices */
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for (i = 0; i < nr_bugapi_disks; i++) {
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char disk[32];
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char *chp;
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strcpy(disk, "/chosen/disk0");
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ASSERT(sizeof(disk) > strlen(disk));
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chp = strchr(disk, '0');
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*chp = *chp + i;
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if (tree_find_property(bugapi->root, disk) != NULL)
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bugapi->disk[i] = tree_find_ihandle_property(bugapi->root, disk);
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}
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}
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static const char *
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emul_bugapi_instruction_name(int call_id)
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{
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static char buffer[40];
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int i;
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for (i = 0; i < ARRAY_SIZE (bug_mapping); i++)
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{
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if (bug_mapping[i].value == call_id)
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return bug_mapping[i].info;
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}
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(void) sprintf (buffer, "Unknown bug call 0x%x", call_id);
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return buffer;
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}
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static int
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emul_bugapi_do_read(os_emul_data *bugapi,
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cpu *processor,
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unsigned_word cia,
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unsigned_word buf,
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int nbytes)
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{
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unsigned char *scratch_buffer;
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int status;
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/* get a tempoary bufer */
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scratch_buffer = (unsigned char *) zalloc(nbytes);
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/* check if buffer exists by reading it */
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emul_read_buffer((void *)scratch_buffer, buf, nbytes, processor, cia);
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/* read */
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status = device_instance_read(bugapi->input,
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(void *)scratch_buffer, nbytes);
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/* -1 = error, -2 = nothing available - see "serial" [IEEE1275] */
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if (status < 0) {
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status = 0;
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}
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if (status > 0) {
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emul_write_buffer((void *)scratch_buffer, buf, status, processor, cia);
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/* Bugapi chops off the trailing n, but leaves it in the buffer */
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if (scratch_buffer[status-1] == '\n' || scratch_buffer[status-1] == '\r')
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status--;
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}
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free(scratch_buffer);
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return status;
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}
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static void
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emul_bugapi_do_diskio(os_emul_data *bugapi,
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cpu *processor,
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unsigned_word cia,
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unsigned_word descriptor_addr,
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int call_id)
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{
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struct dskio_descriptor {
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unsigned_1 ctrl_lun;
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unsigned_1 dev_lun;
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unsigned_2 status;
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unsigned_word pbuffer;
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unsigned_4 blk_num;
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unsigned_2 blk_cnt;
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unsigned_1 flag;
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#define BUG_FILE_MARK 0x80
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#define IGNORE_FILENUM 0x02
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#define END_OF_FILE 0x01
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unsigned_1 addr_mod;
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} descriptor;
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int block;
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emul_read_buffer(&descriptor, descriptor_addr, sizeof(descriptor),
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processor, cia);
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T2H(descriptor.ctrl_lun);
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T2H(descriptor.dev_lun);
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T2H(descriptor.status);
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T2H(descriptor.pbuffer);
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T2H(descriptor.blk_num);
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T2H(descriptor.blk_cnt);
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T2H(descriptor.flag);
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T2H(descriptor.addr_mod);
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if (descriptor.dev_lun >= nr_bugapi_disks
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|| bugapi->disk[descriptor.dev_lun] == NULL) {
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error("emul_bugapi_do_diskio: attempt to access unconfigured disk /chosen/disk%d",
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descriptor.dev_lun);
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}
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else {
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for (block = 0; block < descriptor.blk_cnt; block++) {
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device_instance *disk = bugapi->disk[descriptor.dev_lun];
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unsigned_1 buf[512]; /*????*/
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unsigned_word block_nr = descriptor.blk_num + block;
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unsigned_word byte_nr = block_nr * sizeof(buf);
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unsigned_word block_addr = descriptor.pbuffer + block*sizeof(buf);
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if (device_instance_seek(disk, 0, byte_nr) < 0)
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error("emul_bugapi_do_diskio: bad seek\n");
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switch (call_id) {
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case _DSKRD:
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if (device_instance_read(disk, buf, sizeof(buf)) != sizeof(buf))
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error("emul_`bugapi_do_diskio: bad read\n");
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emul_write_buffer(buf, block_addr, sizeof(buf), processor, cia);
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break;
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case _DSKWR:
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emul_read_buffer(buf, block_addr, sizeof(buf), processor, cia);
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if (device_instance_write(disk, buf, sizeof(buf)) != sizeof(buf))
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error("emul_bugapi_do_diskio: bad write\n");
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break;
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default:
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error("emul_bugapi_do_diskio: bad switch\n");
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}
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}
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}
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}
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static void
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emul_bugapi_do_write(os_emul_data *bugapi,
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cpu *processor,
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unsigned_word cia,
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unsigned_word buf,
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int nbytes,
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const char *suffix)
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{
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void *scratch_buffer = NULL;
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/* get a tempoary bufer */
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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
|