Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 721 insertions, 0 deletions

diff --git a/sim/ppc/hw_init.c b/sim/ppc/hw_init.c
new file mode 100644
index 0000000..b486f6f
--- /dev/null
+++ b/sim/ppc/hw_init.c
@@ -0,0 +1,721 @@
+/*  This file is part of the program psim.
+    
+    Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
+    
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 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 with specified data
+
+
+   DESCRIPTION
+
+
+   The pseudo device <<data>> provides a mechanism specifying the
+   initialization of a small section of memory.
+
+   Normally, the data would be written using a dma operation.
+   However, for some addresses this will not result in the desired
+   result.  For instance, to initialize an address in an eeprom,
+   instead of a simple dma of the data, a sequence of writes (and then
+   real delays) that program the eeprom would be required.
+
+   For dma write initialization, the data device will write the
+   specified <<data>> to <<real-address>> using a normal dma.
+
+   For instance write initialization, the specified <<instance>> is
+   opened.  Then a seek to the <<real-address>> is performed followed
+   by a write of the data.
+
+
+   Integer properties are stored using the target's endian mode.
+
+
+   PROPERTIES
+
+
+   data = <any-valid-property> (required)
+
+   Data to be loaded into memory.  The property type determines how it
+   is loaded.
+
+
+   real-address = <integer> (required)
+
+   Start address at which the data is to be stored.
+
+
+   instance = <string> (optional)
+
+   Instance specification of the device that is to be opened so that
+   the specified data can be written to it.
+
+
+   EXAMPLES
+
+
+   The examples below illustrate the two alternative mechanisms that
+   can be used to store the value 0x12345678 at address 0xfff00c00,
+   which is normally part of the 512k system eeprom.
+
+
+   If the eeprom is being modeled by ram (<<memory>> device) then the
+   standard dma initialization can be used.  By convention: the data
+   devices are uniquely identified by argumenting them with the
+   destinations real address; and all data devices are put under the
+   node <</openprom/init>>.
+
+   | /openprom/memory@0xfff00000/reg 0xfff00000 0x80000
+   | /openprom/init/data@0x1000/data 0x12345678
+   | /openprom/init/data@0x1000/real-address 0x1000
+
+
+   If instead a real eeprom was being used the instance write method
+   would instead need to be used (storing just a single byte in an
+   eeprom requires a complex sequence of accesses).  The
+   <<real-address>> is specified as <<0x0c00>> which is the offset
+   into the eeprom.  For brevity, most of the eeprom properties have
+   been omited.
+
+   | /iobus/eeprom@0xfff00000/reg 0xfff00000 0x80000
+   | /openprom/init/data@0xfff00c00/real-address 0x0c00
+   | /openprom/init/data@0xfff00c00/data 0x12345667
+   | /openprom/init/data@0xfff00c00/instance /iobus/eeprom@0xfff00000/reg
+
+
+   BUGS
+
+
+   At present, only <<integer>> properties can be specified for an
+   initial data value.
+
+   */
+
+
+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");
+  const char *instance_spec = (device_find_property(me, "instance") != NULL
+			       ? device_find_string_property(me, "instance")
+			       : NULL);
+  device_instance *instance = NULL;
+  if (data == NULL)
+    device_error(me, "missing property <data>\n");
+  if (instance_spec != NULL)
+    instance = tree_instance(me, instance_spec);
+  switch (data->type) {
+  case integer_property:
+    {
+      unsigned_cell buf = device_find_integer_property(me, "data");
+      H2T(buf);
+      if (instance == NULL) {
+	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);
+      }
+      else {
+	if (device_instance_seek(instance, 0, addr) < 0
+	    || device_instance_write(instance, &buf, sizeof(buf)) != sizeof(buf))
+	  device_error(me, "Problem storing integer 0x%x at 0x%lx of instance %s\n",
+		       (unsigned)buf, (unsigned long)addr, instance_spec);
+      }
+    }
+    break;
+  default:
+    device_error(me, "Write of this data is not yet implemented\n");
+    break;
+  }
+  if (instance != NULL)
+    device_instance_delete(instance);
+}
+
+
+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.
+
+
+   claim = <anything> (optional)
+
+   If this property is present, the real memory that is to be used by
+   the image being loaded will be claimed from the memory node
+   (specified by the ihandle <</chosen/memory>>).
+
+
+   BUGS
+
+   
+   When loading the binary the bfd virtual-address is used.  It should
+   be using the bfd load-address.
+
+   */
+
+/* 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 claim specified, allocate region from the memory device */
+  if (device_find_property(me, "claim") != NULL) {
+    device_instance *memory = tree_find_ihandle_property(me, "/chosen/memory");
+    unsigned_cell mem_in[3];
+    unsigned_cell mem_out[1];
+    mem_in[0] = 0; /*alignment - top-of-stack*/
+    mem_in[1] = section_size;
+    mem_in[2] = section_vma;
+    if (device_instance_call_method(memory, "claim", 3, mem_in, 1, mem_out) < 0)
+      device_error(me, "failed to claim memory for section at 0x%lx (0x%lx",
+		   section_vma,
+		   section_size);
+    if (mem_out[0] != section_vma)
+      device_error(me, "section address not as requested");
+  }
+
+  /* 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),
+			  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 void
+create_ppc_chirp_bootargs(device *me,
+			  char **argv)
+{
+  /* concat the arguments */
+  char args[1024];
+  char **chp = argv + 1;
+  args[0] = '\0';
+  while (*chp != NULL) {
+    if (strlen(args) > 0)
+      strcat(args, " ");
+    if (strlen(args) + strlen(*chp) >= sizeof(args))
+      device_error(me, "buffer overflow");
+    strcat(args, *chp);
+    chp++;
+  }
+
+  /* set the arguments property */
+  tree_parse(me, "/chosen/bootargs \"%s", args);
+}
+
+
+static int
+hw_stack_ioctl(device *me,
+	       cpu *processor,
+	       unsigned_word cia,
+	       device_ioctl_request request,
+	       va_list ap)
+{
+  switch (request) {
+  case device_ioctl_create_stack:
+    {
+      unsigned_word stack_pointer = va_arg(ap, unsigned_word);
+      char **argv = va_arg(ap, char **);
+      char **envp = va_arg(ap, char **);
+      const char *stack_type;
+      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, "chirp") == 0)
+	create_ppc_chirp_bootargs(me, argv);
+      else if (strcmp(stack_type, "none") != 0)
+	device_error(me, "Unknown initial stack frame type %s", stack_type);
+      DTRACE(stack, 
+	     ("stack_ioctl_callback() = void\n"));
+      break;
+    }
+  default:
+    device_error(me, "Unsupported ioctl requested");
+    break;
+  }
+  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,
+};
+
+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_