720 lines
20 KiB
C
720 lines
20 KiB
C
/* This file is part of the program psim.
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Copyright 1994, 1997, 2003, 2004 Andrew Cagney
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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 _HW_INIT_C_
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#define _HW_INIT_C_
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#include "device_table.h"
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#include "bfd.h"
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#include "psim.h"
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/* DMA a file into memory */
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static int
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dma_file(device *me,
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const char *file_name,
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unsigned_word addr)
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{
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int count;
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int inc;
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FILE *image;
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char buf[1024];
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/* get it open */
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image = fopen(file_name, "r");
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if (image == NULL)
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return -1;
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/* read it in slowly */
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count = 0;
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while (1) {
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inc = fread(buf, 1, sizeof(buf), image);
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if (inc <= 0)
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break;
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if (device_dma_write_buffer(device_parent(me),
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buf,
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0 /*address-space*/,
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addr+count,
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inc /*nr-bytes*/,
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1 /*violate ro*/) != inc) {
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fclose(image);
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return -1;
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}
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count += inc;
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}
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/* close down again */
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fclose(image);
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return count;
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}
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/* DEVICE
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file - load a file into memory
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DESCRIPTION
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Loads the entire contents of <file-name> into memory at starting at
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<<real-address>>. Assumes that memory exists for the load.
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PROPERTIES
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file-name = <string>
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Name of the file to be loaded into memory
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real-address = <integer>
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Real address at which the file is to be loaded */
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static void
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hw_file_init_data_callback(device *me)
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{
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int count;
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const char *file_name = device_find_string_property(me, "file-name");
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unsigned_word addr = device_find_integer_property(me, "real-address");
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/* load the file */
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count = dma_file(me, file_name, addr);
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if (count < 0)
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device_error(me, "Problem loading file %s\n", file_name);
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}
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static device_callbacks const hw_file_callbacks = {
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{ NULL, hw_file_init_data_callback, },
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{ NULL, }, /* address */
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{ NULL, }, /* IO */
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{ NULL, }, /* DMA */
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{ NULL, }, /* interrupt */
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{ NULL, }, /* unit */
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};
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/* DEVICE
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data - initialize a memory location with specified data
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DESCRIPTION
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The pseudo device <<data>> provides a mechanism specifying the
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initialization of a small section of memory.
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Normally, the data would be written using a dma operation.
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However, for some addresses this will not result in the desired
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result. For instance, to initialize an address in an eeprom,
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instead of a simple dma of the data, a sequence of writes (and then
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real delays) that program the eeprom would be required.
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For dma write initialization, the data device will write the
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specified <<data>> to <<real-address>> using a normal dma.
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For instance write initialization, the specified <<instance>> is
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opened. Then a seek to the <<real-address>> is performed followed
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by a write of the data.
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Integer properties are stored using the target's endian mode.
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PROPERTIES
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data = <any-valid-property> (required)
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Data to be loaded into memory. The property type determines how it
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is loaded.
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real-address = <integer> (required)
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Start address at which the data is to be stored.
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instance = <string> (optional)
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Instance specification of the device that is to be opened so that
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the specified data can be written to it.
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EXAMPLES
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The examples below illustrate the two alternative mechanisms that
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can be used to store the value 0x12345678 at address 0xfff00c00,
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which is normally part of the 512k system eeprom.
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If the eeprom is being modeled by ram (<<memory>> device) then the
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standard dma initialization can be used. By convention: the data
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devices are uniquely identified by argumenting them with the
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destinations real address; and all data devices are put under the
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node <</openprom/init>>.
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| /openprom/memory@0xfff00000/reg 0xfff00000 0x80000
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| /openprom/init/data@0x1000/data 0x12345678
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| /openprom/init/data@0x1000/real-address 0x1000
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If instead a real eeprom was being used the instance write method
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would instead need to be used (storing just a single byte in an
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eeprom requires a complex sequence of accesses). The
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<<real-address>> is specified as <<0x0c00>> which is the offset
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into the eeprom. For brevity, most of the eeprom properties have
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been omited.
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| /iobus/eeprom@0xfff00000/reg 0xfff00000 0x80000
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| /openprom/init/data@0xfff00c00/real-address 0x0c00
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| /openprom/init/data@0xfff00c00/data 0x12345667
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| /openprom/init/data@0xfff00c00/instance /iobus/eeprom@0xfff00000/reg
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BUGS
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At present, only <<integer>> properties can be specified for an
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initial data value.
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*/
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static void
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hw_data_init_data_callback(device *me)
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{
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unsigned_word addr = device_find_integer_property(me, "real-address");
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const device_property *data = device_find_property(me, "data");
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const char *instance_spec = (device_find_property(me, "instance") != NULL
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? device_find_string_property(me, "instance")
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: NULL);
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device_instance *instance = NULL;
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if (data == NULL)
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device_error(me, "missing property <data>\n");
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if (instance_spec != NULL)
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instance = tree_instance(me, instance_spec);
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switch (data->type) {
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case integer_property:
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{
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unsigned_cell buf = device_find_integer_property(me, "data");
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H2T(buf);
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if (instance == NULL) {
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if (device_dma_write_buffer(device_parent(me),
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&buf,
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0 /*address-space*/,
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addr,
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sizeof(buf), /*nr-bytes*/
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1 /*violate ro*/) != sizeof(buf))
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device_error(me, "Problem storing integer 0x%x at 0x%lx\n",
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(unsigned)buf, (unsigned long)addr);
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}
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else {
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if (device_instance_seek(instance, 0, addr) < 0
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|| device_instance_write(instance, &buf, sizeof(buf)) != sizeof(buf))
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device_error(me, "Problem storing integer 0x%x at 0x%lx of instance %s\n",
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(unsigned)buf, (unsigned long)addr, instance_spec);
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}
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}
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break;
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default:
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device_error(me, "Write of this data is not yet implemented\n");
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break;
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}
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if (instance != NULL)
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device_instance_delete(instance);
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}
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static device_callbacks const hw_data_callbacks = {
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{ NULL, hw_data_init_data_callback, },
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{ NULL, }, /* address */
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{ NULL, }, /* IO */
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{ NULL, }, /* DMA */
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{ NULL, }, /* interrupt */
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{ NULL, }, /* unit */
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};
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/* DEVICE
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load-binary - load binary segments into memory
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DESCRIPTION
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Each loadable segment of the specified binary is loaded into memory
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at its required address. It is assumed that the memory at those
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addresses already exists.
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This device is normally used to load an executable into memory as
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part of real mode simulation.
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PROPERTIES
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file-name = <string>
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Name of the binary to be loaded.
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claim = <anything> (optional)
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If this property is present, the real memory that is to be used by
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the image being loaded will be claimed from the memory node
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(specified by the ihandle <</chosen/memory>>).
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BUGS
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When loading the binary the bfd virtual-address is used. It should
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be using the bfd load-address.
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*/
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/* DEVICE
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map-binary - map the binary into the users address space
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DESCRIPTION
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Similar to load-binary except that memory for each segment is
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created before the corresponding data for the segment is loaded.
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This device is normally used to load an executable into a user mode
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simulation.
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PROPERTIES
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file-name = <string>
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Name of the binary to be loaded.
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*/
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static void
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update_for_binary_section(bfd *abfd,
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asection *the_section,
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PTR obj)
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{
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unsigned_word section_vma;
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unsigned_word section_size;
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access_type access;
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device *me = (device*)obj;
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/* skip the section if no memory to allocate */
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if (! (bfd_get_section_flags(abfd, the_section) & SEC_ALLOC))
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return;
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/* check/ignore any sections of size zero */
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section_size = bfd_get_section_size (the_section);
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if (section_size == 0)
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return;
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/* find where it is to go */
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section_vma = bfd_get_section_vma(abfd, the_section);
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DTRACE(binary,
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("name=%-7s, vma=0x%.8lx, size=%6ld, flags=%3lx(%s%s%s%s%s )\n",
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bfd_get_section_name(abfd, the_section),
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(long)section_vma,
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(long)section_size,
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(long)bfd_get_section_flags(abfd, the_section),
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bfd_get_section_flags(abfd, the_section) & SEC_LOAD ? " LOAD" : "",
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bfd_get_section_flags(abfd, the_section) & SEC_CODE ? " CODE" : "",
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bfd_get_section_flags(abfd, the_section) & SEC_DATA ? " DATA" : "",
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bfd_get_section_flags(abfd, the_section) & SEC_ALLOC ? " ALLOC" : "",
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bfd_get_section_flags(abfd, the_section) & SEC_READONLY ? " READONLY" : ""
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));
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/* If there is an .interp section, it means it needs a shared library interpreter. */
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if (strcmp(".interp", bfd_get_section_name(abfd, the_section)) == 0)
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error("Shared libraries are not yet supported.\n");
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/* determine the devices access */
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access = access_read;
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if (bfd_get_section_flags(abfd, the_section) & SEC_CODE)
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access |= access_exec;
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if (!(bfd_get_section_flags(abfd, the_section) & SEC_READONLY))
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access |= access_write;
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/* if claim specified, allocate region from the memory device */
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if (device_find_property(me, "claim") != NULL) {
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device_instance *memory = tree_find_ihandle_property(me, "/chosen/memory");
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unsigned_cell mem_in[3];
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unsigned_cell mem_out[1];
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mem_in[0] = 0; /*alignment - top-of-stack*/
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mem_in[1] = section_size;
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mem_in[2] = section_vma;
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if (device_instance_call_method(memory, "claim", 3, mem_in, 1, mem_out) < 0)
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device_error(me, "failed to claim memory for section at 0x%lx (0x%lx",
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section_vma,
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section_size);
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if (mem_out[0] != section_vma)
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device_error(me, "section address not as requested");
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}
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/* if a map, pass up a request to create the memory in core */
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if (strncmp(device_name(me), "map-binary", strlen("map-binary")) == 0)
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device_attach_address(device_parent(me),
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attach_raw_memory,
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0 /*address space*/,
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section_vma,
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section_size,
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access,
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me);
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/* if a load dma in the required data */
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if (bfd_get_section_flags(abfd, the_section) & SEC_LOAD) {
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void *section_init = zalloc(section_size);
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if (!bfd_get_section_contents(abfd,
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the_section,
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section_init, 0,
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section_size)) {
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bfd_perror("binary");
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device_error(me, "load of data failed");
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return;
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}
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if (device_dma_write_buffer(device_parent(me),
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section_init,
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0 /*space*/,
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section_vma,
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section_size,
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1 /*violate_read_only*/)
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!= section_size)
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device_error(me, "broken transfer\n");
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free(section_init); /* only free if load */
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}
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}
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static void
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hw_binary_init_data_callback(device *me)
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{
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/* get the file name */
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const char *file_name = device_find_string_property(me, "file-name");
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bfd *image;
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/* open the file */
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image = bfd_openr(file_name, NULL);
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if (image == NULL) {
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bfd_perror("binary");
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device_error(me, "Failed to open file %s\n", file_name);
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}
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/* check it is valid */
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if (!bfd_check_format(image, bfd_object)) {
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bfd_close(image);
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device_error(me, "The file %s has an invalid binary format\n", file_name);
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}
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/* and the data sections */
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bfd_map_over_sections(image,
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update_for_binary_section,
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(PTR)me);
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bfd_close(image);
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}
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static device_callbacks const hw_binary_callbacks = {
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{ NULL, hw_binary_init_data_callback, },
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{ NULL, }, /* address */
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{ NULL, }, /* IO */
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{ NULL, }, /* DMA */
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{ NULL, }, /* interrupt */
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{ NULL, }, /* unit */
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};
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/* DEVICE
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stack - create an initial stack frame in memory
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DESCRIPTION
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Creates a stack frame of the specified type in memory.
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Due to the startup sequence gdb uses when commencing a simulation,
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it is not possible for the data to be placed on the stack to be
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specified as part of the device tree. Instead the arguments to be
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pushed onto the stack are specified using an IOCTL call.
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The IOCTL takes the additional arguments:
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| unsigned_word stack_end -- where the stack should come down from
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| char **argv -- ...
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| char **envp -- ...
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PROPERTIES
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stack-type = <string>
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The form of the stack frame that is to be created.
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*/
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static int
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sizeof_argument_strings(char **arg)
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{
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int sizeof_strings = 0;
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/* robust */
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if (arg == NULL)
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return 0;
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/* add up all the string sizes (padding as we go) */
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for (; *arg != NULL; arg++) {
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int len = strlen(*arg) + 1;
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sizeof_strings += ALIGN_8(len);
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}
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return sizeof_strings;
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}
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static int
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number_of_arguments(char **arg)
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{
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int nr;
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if (arg == NULL)
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return 0;
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for (nr = 0; *arg != NULL; arg++, nr++);
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return nr;
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}
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static int
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sizeof_arguments(char **arg)
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{
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return ALIGN_8((number_of_arguments(arg) + 1) * sizeof(unsigned_word));
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}
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static void
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write_stack_arguments(device *me,
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char **arg,
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unsigned_word start_block,
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unsigned_word end_block,
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unsigned_word start_arg,
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unsigned_word end_arg)
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{
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DTRACE(stack,
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("write_stack_arguments(device=%s, arg=0x%lx, start_block=0x%lx, end_block=0x%lx, start_arg=0x%lx, end_arg=0x%lx)\n",
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device_name(me), (long)arg, (long)start_block, (long)end_block, (long)start_arg, (long)end_arg));
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if (arg == NULL)
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device_error(me, "Attempt to write a null array onto the stack\n");
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/* only copy in arguments, memory is already zero */
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for (; *arg != NULL; arg++) {
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int len = strlen(*arg)+1;
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unsigned_word target_start_block;
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DTRACE(stack,
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("write_stack_arguments() write %s=%s at %s=0x%lx %s=0x%lx %s=0x%lx\n",
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"**arg", *arg, "start_block", (long)start_block,
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"len", (long)len, "start_arg", (long)start_arg));
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if (psim_write_memory(device_system(me), 0, *arg,
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start_block, len,
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0/*violate_readonly*/) != len)
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device_error(me, "Write of **arg (%s) at 0x%lx of stack failed\n",
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*arg, (unsigned long)start_block);
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target_start_block = H2T_word(start_block);
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if (psim_write_memory(device_system(me), 0, &target_start_block,
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start_arg, sizeof(target_start_block),
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0) != sizeof(target_start_block))
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device_error(me, "Write of *arg onto stack failed\n");
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start_block += ALIGN_8(len);
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start_arg += sizeof(start_block);
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}
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start_arg += sizeof(start_block); /*the null at the end*/
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if (start_block != end_block
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|| ALIGN_8(start_arg) != end_arg)
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device_error(me, "Probable corrpution of stack arguments\n");
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DTRACE(stack, ("write_stack_arguments() = void\n"));
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}
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static void
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create_ppc_elf_stack_frame(device *me,
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unsigned_word bottom_of_stack,
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char **argv,
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char **envp)
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{
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/* fixme - this is over aligned */
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/* information block */
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const unsigned sizeof_envp_block = sizeof_argument_strings(envp);
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const unsigned_word start_envp_block = bottom_of_stack - sizeof_envp_block;
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const unsigned sizeof_argv_block = sizeof_argument_strings(argv);
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const unsigned_word start_argv_block = start_envp_block - sizeof_argv_block;
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/* auxiliary vector - contains only one entry */
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const unsigned sizeof_aux_entry = 2*sizeof(unsigned_word); /* magic */
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const unsigned_word start_aux = start_argv_block - ALIGN_8(sizeof_aux_entry);
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/* environment points (including null sentinal) */
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const unsigned sizeof_envp = sizeof_arguments(envp);
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const unsigned_word start_envp = start_aux - sizeof_envp;
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/* argument pointers (including null sentinal) */
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const int argc = number_of_arguments(argv);
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const unsigned sizeof_argv = sizeof_arguments(argv);
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const unsigned_word start_argv = start_envp - sizeof_argv;
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/* link register save address - alligned to a 16byte boundary */
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const unsigned_word top_of_stack = ((start_argv
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- 2 * sizeof(unsigned_word))
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& ~0xf);
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/* install arguments on stack */
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write_stack_arguments(me, envp,
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start_envp_block, bottom_of_stack,
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start_envp, start_aux);
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write_stack_arguments(me, argv,
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start_argv_block, start_envp_block,
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start_argv, start_envp);
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/* set up the registers */
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ASSERT (psim_write_register(device_system(me), -1,
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&top_of_stack, "sp", cooked_transfer) > 0);
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ASSERT (psim_write_register(device_system(me), -1,
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&argc, "r3", cooked_transfer) > 0);
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ASSERT (psim_write_register(device_system(me), -1,
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&start_argv, "r4", cooked_transfer) > 0);
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ASSERT (psim_write_register(device_system(me), -1,
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&start_envp, "r5", cooked_transfer) > 0);
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ASSERT (psim_write_register(device_system(me), -1,
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&start_aux, "r6", cooked_transfer) > 0);
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}
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static void
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create_ppc_aix_stack_frame(device *me,
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unsigned_word bottom_of_stack,
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char **argv,
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char **envp)
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{
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unsigned_word core_envp;
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unsigned_word core_argv;
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unsigned_word core_argc;
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unsigned_word core_aux;
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unsigned_word top_of_stack;
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/* cheat - create an elf stack frame */
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create_ppc_elf_stack_frame(me, bottom_of_stack, argv, envp);
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/* extract argument addresses from registers */
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ASSERT (psim_read_register(device_system(me), 0,
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&top_of_stack, "r1", cooked_transfer) > 0);
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ASSERT (psim_read_register(device_system(me), 0,
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&core_argc, "r3", cooked_transfer) > 0);
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ASSERT (psim_read_register(device_system(me), 0,
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&core_argv, "r4", cooked_transfer) > 0);
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ASSERT (psim_read_register(device_system(me), 0,
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&core_envp, "r5", cooked_transfer) > 0);
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ASSERT (psim_read_register(device_system(me), 0,
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&core_aux, "r6", cooked_transfer) > 0);
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/* extract arguments from registers */
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device_error(me, "Unfinished procedure create_ppc_aix_stack_frame\n");
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}
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static void
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create_ppc_chirp_bootargs(device *me,
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char **argv)
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{
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/* concat the arguments */
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char args[1024];
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char **chp = argv + 1;
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args[0] = '\0';
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while (*chp != NULL) {
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if (strlen(args) > 0)
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strcat(args, " ");
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if (strlen(args) + strlen(*chp) >= sizeof(args))
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device_error(me, "buffer overflow");
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strcat(args, *chp);
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chp++;
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}
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/* set the arguments property */
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tree_parse(me, "/chosen/bootargs \"%s", args);
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}
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static int
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hw_stack_ioctl(device *me,
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cpu *processor,
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unsigned_word cia,
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device_ioctl_request request,
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va_list ap)
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{
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switch (request) {
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case device_ioctl_create_stack:
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{
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unsigned_word stack_pointer = va_arg(ap, unsigned_word);
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char **argv = va_arg(ap, char **);
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char **envp = va_arg(ap, char **);
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const char *stack_type;
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DTRACE(stack,
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("stack_ioctl_callback(me=0x%lx:%s processor=0x%lx cia=0x%lx argv=0x%lx envp=0x%lx)\n",
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(long)me, device_name(me),
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(long)processor,
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(long)cia,
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(long)argv,
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(long)envp));
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stack_type = device_find_string_property(me, "stack-type");
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if (strcmp(stack_type, "ppc-elf") == 0)
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create_ppc_elf_stack_frame(me, stack_pointer, argv, envp);
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else if (strcmp(stack_type, "ppc-xcoff") == 0)
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create_ppc_aix_stack_frame(me, stack_pointer, argv, envp);
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else if (strcmp(stack_type, "chirp") == 0)
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create_ppc_chirp_bootargs(me, argv);
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else if (strcmp(stack_type, "none") != 0)
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device_error(me, "Unknown initial stack frame type %s", stack_type);
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DTRACE(stack,
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("stack_ioctl_callback() = void\n"));
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break;
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}
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default:
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device_error(me, "Unsupported ioctl requested");
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break;
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}
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return 0;
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}
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static device_callbacks const hw_stack_callbacks = {
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{ NULL, },
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{ NULL, }, /* address */
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{ NULL, }, /* IO */
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{ NULL, }, /* DMA */
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{ NULL, }, /* interrupt */
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{ NULL, }, /* unit */
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NULL, /* instance */
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hw_stack_ioctl,
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};
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const device_descriptor hw_init_device_descriptor[] = {
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{ "file", NULL, &hw_file_callbacks },
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{ "data", NULL, &hw_data_callbacks },
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{ "load-binary", NULL, &hw_binary_callbacks },
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{ "map-binary", NULL, &hw_binary_callbacks },
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{ "stack", NULL, &hw_stack_callbacks },
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{ NULL },
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};
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#endif /* _HW_INIT_C_ */
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