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Diffstat (limited to 'gdb/gdbarch.c')
| -rw-r--r-- | gdb/gdbarch.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c new file mode 100644 index 0000000..154fa8f --- /dev/null +++ b/gdb/gdbarch.c @@ -0,0 +1,360 @@ +/* Semi-dynamic architecture support for GDB, the GNU debugger. + Copyright 1998, Free Software Foundation, Inc. + +This file is part of GDB. + +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. */ + +#include "defs.h" +#include "bfd.h" +#include "gdbcmd.h" + + + +/* Non-zero if we want to trace architecture code. */ + +#ifndef GDBARCH_DEBUG +#define GDBARCH_DEBUG 0 +#endif +int gdbarch_debug = GDBARCH_DEBUG; + + +/* Functions to manipulate the endianness of the target. */ + +#ifdef TARGET_BYTE_ORDER_SELECTABLE +/* compat - Catch old targets that expect a selectable byte-order to + default to BIG_ENDIAN */ +#ifndef TARGET_BYTE_ORDER_DEFAULT +#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN +#endif +#endif +#ifndef TARGET_BYTE_ORDER_DEFAULT +/* compat - Catch old non byte-order selectable targets that do not + define TARGET_BYTE_ORDER_DEFAULT and instead expect + TARGET_BYTE_ORDER to be used as the default. For targets that + defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the + below will get a strange compiler warning. */ +#define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER +#endif +int target_byte_order = TARGET_BYTE_ORDER_DEFAULT; +int target_byte_order_auto = 1; + +/* Chain containing the \"set endian\" commands. */ +static struct cmd_list_element *endianlist = NULL; + +/* Called by ``show endian''. */ +static void show_endian PARAMS ((char *, int)); +static void +show_endian (args, from_tty) + char *args; + int from_tty; +{ + char *msg = + (TARGET_BYTE_ORDER_AUTO + ? "The target endianness is set automatically (currently %s endian)\n" + : "The target is assumed to be %s endian\n"); + printf_unfiltered (msg, (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little")); +} + +/* Called if the user enters ``set endian'' without an argument. */ +static void set_endian PARAMS ((char *, int)); +static void +set_endian (args, from_tty) + char *args; + int from_tty; +{ + printf_unfiltered ("\"set endian\" must be followed by \"auto\", \"big\" or \"little\".\n"); + show_endian (args, from_tty); +} + +/* Called by ``set endian big''. */ +static void set_endian_big PARAMS ((char *, int)); +static void +set_endian_big (args, from_tty) + char *args; + int from_tty; +{ + if (TARGET_BYTE_ORDER_SELECTABLE_P) + { + target_byte_order = BIG_ENDIAN; + target_byte_order_auto = 0; + } + else + { + printf_unfiltered ("Byte order is not selectable."); + show_endian (args, from_tty); + } +} + +/* Called by ``set endian little''. */ +static void set_endian_little PARAMS ((char *, int)); +static void +set_endian_little (args, from_tty) + char *args; + int from_tty; +{ + if (TARGET_BYTE_ORDER_SELECTABLE_P) + { + target_byte_order = LITTLE_ENDIAN; + target_byte_order_auto = 0; + } + else + { + printf_unfiltered ("Byte order is not selectable."); + show_endian (args, from_tty); + } +} + +/* Called by ``set endian auto''. */ +static void set_endian_auto PARAMS ((char *, int)); +static void +set_endian_auto (args, from_tty) + char *args; + int from_tty; +{ + if (TARGET_BYTE_ORDER_SELECTABLE_P) + { + target_byte_order_auto = 1; + } + else + { + printf_unfiltered ("Byte order is not selectable."); + show_endian (args, from_tty); + } +} + +/* Set the endianness from a BFD. */ +static void set_endian_from_file PARAMS ((bfd *)); +static void +set_endian_from_file (abfd) + bfd *abfd; +{ + if (TARGET_BYTE_ORDER_SELECTABLE_P) + { + int want; + + if (bfd_big_endian (abfd)) + want = BIG_ENDIAN; + else + want = LITTLE_ENDIAN; + if (TARGET_BYTE_ORDER_AUTO) + target_byte_order = want; + else if (TARGET_BYTE_ORDER != want) + warning ("%s endian file does not match %s endian target.", + want == BIG_ENDIAN ? "big" : "little", + TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"); + } + else + { + if (bfd_big_endian (abfd) + ? TARGET_BYTE_ORDER != BIG_ENDIAN + : TARGET_BYTE_ORDER == BIG_ENDIAN) + warning ("%s endian file does not match %s endian target.", + bfd_big_endian (abfd) ? "big" : "little", + TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"); + } +} + + + +/* Functions to manipulate the architecture of the target */ + +int target_architecture_auto = 1; +extern const struct bfd_arch_info bfd_default_arch_struct; +const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct; +int (*target_architecture_hook) PARAMS ((const struct bfd_arch_info *ap)); + +/* Do the real work of changing the current architecture */ +static void +set_arch (arch) + const struct bfd_arch_info *arch; +{ + /* FIXME: Is it compatible with gdb? */ + /* Check with the target on the setting */ + if (target_architecture_hook != NULL + && !target_architecture_hook (arch)) + printf_unfiltered ("Target does not support `%s' architecture.\n", + arch->printable_name); + else + { + target_architecture_auto = 0; + target_architecture = arch; + } +} + +/* Called if the user enters ``show architecture'' without an argument. */ +static void show_architecture PARAMS ((char *, int)); +static void +show_architecture (args, from_tty) + char *args; + int from_tty; +{ + const char *arch; + arch = TARGET_ARCHITECTURE->printable_name; + if (target_architecture_auto) + printf_filtered ("The target architecture is set automatically (currently %s)\n", arch); + else + printf_filtered ("The target architecture is assumed to be %s\n", arch); +} + +/* Called if the user enters ``set architecture'' with or without an + argument. */ +static void set_architecture PARAMS ((char *, int)); +static void +set_architecture (args, from_tty) + char *args; + int from_tty; +{ + if (args == NULL) + { + printf_unfiltered ("\"set architecture\" must be followed by \"auto\" or an architecture name.\n"); + } + else if (strcmp (args, "auto") == 0) + { + target_architecture_auto = 1; + } + else + { + const struct bfd_arch_info *arch = bfd_scan_arch (args); + if (arch != NULL) + set_arch (arch); + else + printf_unfiltered ("Architecture `%s' not reconized.\n", args); + } +} + +/* Called if the user enters ``info architecture'' without an argument. */ +static void info_architecture PARAMS ((char *, int)); +static void +info_architecture (args, from_tty) + char *args; + int from_tty; +{ + enum bfd_architecture a; + printf_filtered ("Available architectures are:\n"); + for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++) + { + const struct bfd_arch_info *ap = bfd_lookup_arch (a, 0); + if (ap != NULL) + { + do + { + printf_filtered (" %s", ap->printable_name); + ap = ap->next; + } + while (ap != NULL); + printf_filtered ("\n"); + } + } +} + +/* Set the architecture from arch/machine */ +void +set_architecture_from_arch_mach (arch, mach) + enum bfd_architecture arch; + unsigned long mach; +{ + const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach); + if (wanted != NULL) + set_arch (wanted); + else + fatal ("hardwired architecture/machine not reconized"); +} + +/* Set the architecture from a BFD */ +static void set_architecture_from_file PARAMS ((bfd *)); +static void +set_architecture_from_file (abfd) + bfd *abfd; +{ + const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd); + if (target_architecture_auto) + { + if (target_architecture_hook != NULL + && !target_architecture_hook (wanted)) + warning ("Target may not support %s architecture", + wanted->printable_name); + target_architecture = wanted; + } + else if (wanted != target_architecture) + { + warning ("%s architecture file may be incompatible with %s target.", + wanted->printable_name, + target_architecture->printable_name); + } +} + + + +/* Disassembler */ + +/* Pointer to the target-dependent disassembly function. */ +int (*tm_print_insn) PARAMS ((bfd_vma, disassemble_info *)); +disassemble_info tm_print_insn_info; + + + +/* Set the dynamic target-system-dependant parameters (architecture, + byte-order) using information found in the BFD */ + +void +set_gdbarch_from_file (abfd) + bfd *abfd; +{ + set_architecture_from_file (abfd); + set_endian_from_file (abfd); +} + + +extern void _initialize_gdbarch PARAMS ((void)); +void +_initialize_gdbarch () +{ + add_prefix_cmd ("endian", class_support, set_endian, + "Set endianness of target.", + &endianlist, "set endian ", 0, &setlist); + add_cmd ("big", class_support, set_endian_big, + "Set target as being big endian.", &endianlist); + add_cmd ("little", class_support, set_endian_little, + "Set target as being little endian.", &endianlist); + add_cmd ("auto", class_support, set_endian_auto, + "Select target endianness automatically.", &endianlist); + add_cmd ("endian", class_support, show_endian, + "Show endianness of target.", &showlist); + + add_cmd ("architecture", class_support, set_architecture, + "Set architecture of target.", &setlist); + add_alias_cmd ("processor", "architecture", class_support, 1, &setlist); + add_cmd ("architecture", class_support, show_architecture, + "Show architecture of target.", &showlist); + add_cmd ("architecture", class_support, info_architecture, + "List supported target architectures", &infolist); + + INIT_DISASSEMBLE_INFO_NO_ARCH (tm_print_insn_info, gdb_stdout, (fprintf_ftype)fprintf_filtered); + tm_print_insn_info.flavour = bfd_target_unknown_flavour; + tm_print_insn_info.read_memory_func = dis_asm_read_memory; + tm_print_insn_info.memory_error_func = dis_asm_memory_error; + tm_print_insn_info.print_address_func = dis_asm_print_address; + +#ifdef MAINTENANCE_CMDS + add_show_from_set (add_set_cmd ("archdebug", + class_maintenance, + var_zinteger, + (char *)&gdbarch_debug, + "Set architecture debugging.\n\ +When non-zero, architecture debugging is enabled.", &setlist), + &showlist); +#endif +} |