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Diffstat (limited to 'sim/ppc/hw_init.c')
| -rw-r--r-- | sim/ppc/hw_init.c | 721 |
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 00000000000..b486f6f7860 --- /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_ |