/* This file is part of the program psim. Copyright (C) 1994-1996, Andrew Cagney 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