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-rw-r--r--sim/ppc/hw_init.c569
1 files changed, 569 insertions, 0 deletions
diff --git a/sim/ppc/hw_init.c b/sim/ppc/hw_init.c
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+++ b/sim/ppc/hw_init.c
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+/* This file is part of the program psim.
+
+ Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ */
+
+
+#ifndef _HW_INIT_C_
+#define _HW_INIT_C_
+
+#include "device_table.h"
+#include "bfd.h"
+#include "psim.h"
+
+
+/* DMA a file into memory */
+static int
+dma_file(device *me,
+ const char *file_name,
+ unsigned_word addr)
+{
+ int count;
+ int inc;
+ FILE *image;
+ char buf[1024];
+
+ /* get it open */
+ image = fopen(file_name, "r");
+ if (image == NULL)
+ return -1;
+
+ /* read it in slowly */
+ count = 0;
+ while (1) {
+ inc = fread(buf, 1, sizeof(buf), image);
+ if (feof(image) || ferror(image))
+ break;
+ if (device_dma_write_buffer(device_parent(me),
+ buf,
+ 0 /*address-space*/,
+ addr+count,
+ inc /*nr-bytes*/,
+ 1 /*violate ro*/) != inc) {
+ fclose(image);
+ return -1;
+ }
+ count += inc;
+ }
+
+ /* close down again */
+ fclose(image);
+
+ return count;
+}
+
+
+/* DEVICE
+
+ file - load a file into memory
+
+ DESCRIPTION
+
+ Loads the entire contents of <file-name> into memory at starting at
+ <real-address>. Assumes that memory exists for the load.
+
+ PROPERTIES
+
+ file-name = <string>
+
+ Name of the file to be loaded into memory
+
+ real-address = <integer>
+
+ Real address at which the file is to be loaded */
+
+static void
+hw_file_init_data_callback(device *me)
+{
+ int count;
+ const char *file_name = device_find_string_property(me, "file-name");
+ unsigned_word addr = device_find_integer_property(me, "real-address");
+ /* load the file */
+ count = dma_file(me, file_name, addr);
+ if (count < 0)
+ device_error(me, "Problem loading file %s\n", file_name);
+}
+
+
+static device_callbacks const hw_file_callbacks = {
+ { NULL, hw_file_init_data_callback, },
+ { NULL, }, /* address */
+ { NULL, }, /* IO */
+ { NULL, }, /* DMA */
+ { NULL, }, /* interrupt */
+ { NULL, }, /* unit */
+};
+
+
+/* DEVICE
+
+ data - initialize a memory location
+
+ DESCRIPTION
+
+ A word sized quantity of data is written into memory, using the
+ targets byte ordering, at the specified memory location.
+
+ In the future this device will be extended so that it supports
+ initialization using other data types (eg array, ...)
+
+ PROPERTIES
+
+ data = <int>
+
+ Integer value to be loaded into memory
+
+ real-address = <integer>
+
+ Start address for the data. */
+
+
+static void
+hw_data_init_data_callback(device *me)
+{
+ unsigned_word addr = device_find_integer_property(me, "real-address");
+ const device_property *data = device_find_property(me, "data");
+ if (data == NULL)
+ device_error(me, "missing property <data>\n");
+ switch (data->type) {
+ case integer_property:
+ {
+ unsigned32 buf = device_find_integer_property(me, "data");
+ H2T(buf);
+ if (device_dma_write_buffer(device_parent(me),
+ &buf,
+ 0 /*address-space*/,
+ addr,
+ sizeof(buf), /*nr-bytes*/
+ 1 /*violate ro*/) != sizeof(buf))
+ device_error(me, "Problem storing integer 0x%x at 0x%lx\n",
+ (unsigned)buf, (unsigned long)addr);
+ }
+ break;
+ default:
+ device_error(me, "Write of this data is not yet implemented\n");
+ break;
+ }
+}
+
+
+static device_callbacks const hw_data_callbacks = {
+ { NULL, hw_data_init_data_callback, },
+ { NULL, }, /* address */
+ { NULL, }, /* IO */
+ { NULL, }, /* DMA */
+ { NULL, }, /* interrupt */
+ { NULL, }, /* unit */
+};
+
+
+/* DEVICE
+
+ load-binary - load binary segments into memory
+
+ DESCRIPTION
+
+ Each loadable segment of the specified binary is loaded into memory
+ at its required address. It is assumed that the memory at those
+ addresses already exists.
+
+ This device is normally used to load an executable into memory as
+ part of real mode simulation.
+
+ PROPERTIES
+
+ file-name = <string>
+
+ Name of the binary to be loaded.
+
+ DEVICE
+
+ map-binary - map the binary into the users address space
+
+ DESCRIPTION
+
+ Similar to load-binary except that memory for each segment is
+ created before the corresponding data for the segment is loaded.
+
+ This device is normally used to load an executable into a user mode
+ simulation.
+
+ PROPERTIES
+
+ file-name = <string>
+
+ Name of the binary to be loaded.
+
+ */
+
+static void
+update_for_binary_section(bfd *abfd,
+ asection *the_section,
+ PTR obj)
+{
+ unsigned_word section_vma;
+ unsigned_word section_size;
+ access_type access;
+ device *me = (device*)obj;
+
+ /* skip the section if no memory to allocate */
+ if (! (bfd_get_section_flags(abfd, the_section) & SEC_ALLOC))
+ return;
+
+ /* check/ignore any sections of size zero */
+ section_size = bfd_get_section_size_before_reloc(the_section);
+ if (section_size == 0)
+ return;
+
+ /* find where it is to go */
+ section_vma = bfd_get_section_vma(abfd, the_section);
+
+ DTRACE(binary,
+ ("name=%-7s, vma=0x%.8lx, size=%6ld, flags=%3lx(%s%s%s%s%s )\n",
+ bfd_get_section_name(abfd, the_section),
+ (long)section_vma,
+ (long)section_size,
+ (long)bfd_get_section_flags(abfd, the_section),
+ bfd_get_section_flags(abfd, the_section) & SEC_LOAD ? " LOAD" : "",
+ bfd_get_section_flags(abfd, the_section) & SEC_CODE ? " CODE" : "",
+ bfd_get_section_flags(abfd, the_section) & SEC_DATA ? " DATA" : "",
+ bfd_get_section_flags(abfd, the_section) & SEC_ALLOC ? " ALLOC" : "",
+ bfd_get_section_flags(abfd, the_section) & SEC_READONLY ? " READONLY" : ""
+ ));
+
+ /* If there is an .interp section, it means it needs a shared library interpreter. */
+ if (strcmp(".interp", bfd_get_section_name(abfd, the_section)) == 0)
+ error("Shared libraries are not yet supported.\n");
+
+ /* determine the devices access */
+ access = access_read;
+ if (bfd_get_section_flags(abfd, the_section) & SEC_CODE)
+ access |= access_exec;
+ if (!(bfd_get_section_flags(abfd, the_section) & SEC_READONLY))
+ access |= access_write;
+
+ /* if a map, pass up a request to create the memory in core */
+ if (strncmp(device_name(me), "map-binary", strlen("map-binary")) == 0)
+ device_attach_address(device_parent(me),
+ device_name(me),
+ attach_raw_memory,
+ 0 /*address space*/,
+ section_vma,
+ section_size,
+ access,
+ me);
+
+ /* if a load dma in the required data */
+ if (bfd_get_section_flags(abfd, the_section) & SEC_LOAD) {
+ void *section_init = zalloc(section_size);
+ if (!bfd_get_section_contents(abfd,
+ the_section,
+ section_init, 0,
+ section_size)) {
+ bfd_perror("binary");
+ device_error(me, "load of data failed");
+ return;
+ }
+ if (device_dma_write_buffer(device_parent(me),
+ section_init,
+ 0 /*space*/,
+ section_vma,
+ section_size,
+ 1 /*violate_read_only*/)
+ != section_size)
+ device_error(me, "broken transfer\n");
+ zfree(section_init); /* only free if load */
+ }
+}
+
+static void
+hw_binary_init_data_callback(device *me)
+{
+ /* get the file name */
+ const char *file_name = device_find_string_property(me, "file-name");
+ bfd *image;
+
+ /* open the file */
+ image = bfd_openr(file_name, NULL);
+ if (image == NULL) {
+ bfd_perror("binary");
+ device_error(me, "Failed to open file %s\n", file_name);
+ }
+
+ /* check it is valid */
+ if (!bfd_check_format(image, bfd_object)) {
+ bfd_close(image);
+ device_error(me, "The file %s has an invalid binary format\n", file_name);
+ }
+
+ /* and the data sections */
+ bfd_map_over_sections(image,
+ update_for_binary_section,
+ (PTR)me);
+
+ bfd_close(image);
+}
+
+
+static device_callbacks const hw_binary_callbacks = {
+ { NULL, hw_binary_init_data_callback, },
+ { NULL, }, /* address */
+ { NULL, }, /* IO */
+ { NULL, }, /* DMA */
+ { NULL, }, /* interrupt */
+ { NULL, }, /* unit */
+};
+
+
+/* DEVICE
+
+ stack - create an initial stack frame in memory
+
+ DESCRIPTION
+
+ Creates a stack frame of the specified type in memory.
+
+ Due to the startup sequence gdb uses when commencing a simulation,
+ it is not possible for the data to be placed on the stack to be
+ specified as part of the device tree. Instead the arguments to be
+ pushed onto the stack are specified using an IOCTL call.
+
+ The IOCTL takes the additional arguments:
+
+ | unsigned_word stack_end -- where the stack should come down from
+ | char **argv -- ...
+ | char **envp -- ...
+
+ PROPERTIES
+
+ stack-type = <string>
+
+ The form of the stack frame that is to be created.
+
+ */
+
+static int
+sizeof_argument_strings(char **arg)
+{
+ int sizeof_strings = 0;
+
+ /* robust */
+ if (arg == NULL)
+ return 0;
+
+ /* add up all the string sizes (padding as we go) */
+ for (; *arg != NULL; arg++) {
+ int len = strlen(*arg) + 1;
+ sizeof_strings += ALIGN_8(len);
+ }
+
+ return sizeof_strings;
+}
+
+static int
+number_of_arguments(char **arg)
+{
+ int nr;
+ if (arg == NULL)
+ return 0;
+ for (nr = 0; *arg != NULL; arg++, nr++);
+ return nr;
+}
+
+static int
+sizeof_arguments(char **arg)
+{
+ return ALIGN_8((number_of_arguments(arg) + 1) * sizeof(unsigned_word));
+}
+
+static void
+write_stack_arguments(device *me,
+ char **arg,
+ unsigned_word start_block,
+ unsigned_word end_block,
+ unsigned_word start_arg,
+ unsigned_word end_arg)
+{
+ DTRACE(stack,
+ ("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",
+ device_name(me), (long)arg, (long)start_block, (long)end_block, (long)start_arg, (long)end_arg));
+ if (arg == NULL)
+ device_error(me, "Attempt to write a null array onto the stack\n");
+ /* only copy in arguments, memory is already zero */
+ for (; *arg != NULL; arg++) {
+ int len = strlen(*arg)+1;
+ unsigned_word target_start_block;
+ DTRACE(stack,
+ ("write_stack_arguments() write %s=%s at %s=0x%lx %s=0x%lx %s=0x%lx\n",
+ "**arg", *arg, "start_block", (long)start_block,
+ "len", (long)len, "start_arg", (long)start_arg));
+ if (psim_write_memory(device_system(me), 0, *arg,
+ start_block, len,
+ 0/*violate_readonly*/) != len)
+ device_error(me, "Write of **arg (%s) at 0x%lx of stack failed\n",
+ *arg, (unsigned long)start_block);
+ target_start_block = H2T_word(start_block);
+ if (psim_write_memory(device_system(me), 0, &target_start_block,
+ start_arg, sizeof(target_start_block),
+ 0) != sizeof(target_start_block))
+ device_error(me, "Write of *arg onto stack failed\n");
+ start_block += ALIGN_8(len);
+ start_arg += sizeof(start_block);
+ }
+ start_arg += sizeof(start_block); /*the null at the end*/
+ if (start_block != end_block
+ || ALIGN_8(start_arg) != end_arg)
+ device_error(me, "Probable corrpution of stack arguments\n");
+ DTRACE(stack, ("write_stack_arguments() = void\n"));
+}
+
+static void
+create_ppc_elf_stack_frame(device *me,
+ unsigned_word bottom_of_stack,
+ char **argv,
+ char **envp)
+{
+ /* fixme - this is over aligned */
+
+ /* information block */
+ const unsigned sizeof_envp_block = sizeof_argument_strings(envp);
+ const unsigned_word start_envp_block = bottom_of_stack - sizeof_envp_block;
+ const unsigned sizeof_argv_block = sizeof_argument_strings(argv);
+ const unsigned_word start_argv_block = start_envp_block - sizeof_argv_block;
+
+ /* auxiliary vector - contains only one entry */
+ const unsigned sizeof_aux_entry = 2*sizeof(unsigned_word); /* magic */
+ const unsigned_word start_aux = start_argv_block - ALIGN_8(sizeof_aux_entry);
+
+ /* environment points (including null sentinal) */
+ const unsigned sizeof_envp = sizeof_arguments(envp);
+ const unsigned_word start_envp = start_aux - sizeof_envp;
+
+ /* argument pointers (including null sentinal) */
+ const int argc = number_of_arguments(argv);
+ const unsigned sizeof_argv = sizeof_arguments(argv);
+ const unsigned_word start_argv = start_envp - sizeof_argv;
+
+ /* link register save address - alligned to a 16byte boundary */
+ const unsigned_word top_of_stack = ((start_argv
+ - 2 * sizeof(unsigned_word))
+ & ~0xf);
+
+ /* install arguments on stack */
+ write_stack_arguments(me, envp,
+ start_envp_block, bottom_of_stack,
+ start_envp, start_aux);
+ write_stack_arguments(me, argv,
+ start_argv_block, start_envp_block,
+ start_argv, start_envp);
+
+ /* set up the registers */
+ psim_write_register(device_system(me), -1,
+ &top_of_stack, "sp", cooked_transfer);
+ psim_write_register(device_system(me), -1,
+ &argc, "r3", cooked_transfer);
+ psim_write_register(device_system(me), -1,
+ &start_argv, "r4", cooked_transfer);
+ psim_write_register(device_system(me), -1,
+ &start_envp, "r5", cooked_transfer);
+ psim_write_register(device_system(me), -1,
+ &start_aux, "r6", cooked_transfer);
+}
+
+static void
+create_ppc_aix_stack_frame(device *me,
+ unsigned_word bottom_of_stack,
+ char **argv,
+ char **envp)
+{
+ unsigned_word core_envp;
+ unsigned_word core_argv;
+ unsigned_word core_argc;
+ unsigned_word core_aux;
+ unsigned_word top_of_stack;
+
+ /* cheat - create an elf stack frame */
+ create_ppc_elf_stack_frame(me, bottom_of_stack, argv, envp);
+
+ /* extract argument addresses from registers */
+ psim_read_register(device_system(me), 0,
+ &top_of_stack, "r1", cooked_transfer);
+ psim_read_register(device_system(me), 0,
+ &core_argc, "r3", cooked_transfer);
+ psim_read_register(device_system(me), 0,
+ &core_argv, "r4", cooked_transfer);
+ psim_read_register(device_system(me), 0,
+ &core_envp, "r5", cooked_transfer);
+ psim_read_register(device_system(me), 0,
+ &core_aux, "r6", cooked_transfer);
+
+ /* extract arguments from registers */
+ device_error(me, "Unfinished procedure create_ppc_aix_stack_frame\n");
+}
+
+
+
+static int
+hw_stack_ioctl_callback(device *me,
+ cpu *processor,
+ unsigned_word cia,
+ va_list ap)
+{
+ unsigned_word stack_pointer;
+ const char *stack_type;
+ char **argv;
+ char **envp;
+ stack_pointer = va_arg(ap, unsigned_word);
+ argv = va_arg(ap, char **);
+ envp = va_arg(ap, char **);
+ DTRACE(stack,
+ ("stack_ioctl_callback(me=0x%lx:%s processor=0x%lx cia=0x%lx argv=0x%lx envp=0x%lx)\n",
+ (long)me, device_name(me), (long)processor, (long)cia, (long)argv, (long)envp));
+ stack_type = device_find_string_property(me, "stack-type");
+ if (strcmp(stack_type, "ppc-elf") == 0)
+ create_ppc_elf_stack_frame(me, stack_pointer, argv, envp);
+ else if (strcmp(stack_type, "ppc-xcoff") == 0)
+ create_ppc_aix_stack_frame(me, stack_pointer, argv, envp);
+ else if (strcmp(stack_type, "none") != 0)
+ device_error(me, "Unknown initial stack frame type %s\n", stack_type);
+ DTRACE(stack,
+ ("stack_ioctl_callback() = void\n"));
+ return 0;
+}
+
+static device_callbacks const hw_stack_callbacks = {
+ { NULL, },
+ { NULL, }, /* address */
+ { NULL, }, /* IO */
+ { NULL, }, /* DMA */
+ { NULL, }, /* interrupt */
+ { NULL, }, /* unit */
+ NULL, /* instance */
+ hw_stack_ioctl_callback,
+};
+
+const device_descriptor hw_init_device_descriptor[] = {
+ { "file", NULL, &hw_file_callbacks },
+ { "data", NULL, &hw_data_callbacks },
+ { "load-binary", NULL, &hw_binary_callbacks },
+ { "map-binary", NULL, &hw_binary_callbacks },
+ { "stack", NULL, &hw_stack_callbacks },
+ { NULL },
+};
+
+#endif _HW_INIT_C_
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