| /* Dynamic architecture support for GDB, the GNU debugger. |
| Copyright 1998-1999, 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" |
| |
| #if GDB_MULTI_ARCH |
| #include "gdbcmd.h" |
| #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */ |
| #else |
| /* Just include everything in sight so that the every old definition |
| of macro is visible. */ |
| #include "gdb_string.h" |
| #include <ctype.h> |
| #include "symtab.h" |
| #include "frame.h" |
| #include "inferior.h" |
| #include "breakpoint.h" |
| #include "gdb_wait.h" |
| #include "gdbcore.h" |
| #include "gdbcmd.h" |
| #include "target.h" |
| #include "gdbthread.h" |
| #include "annotate.h" |
| #include "symfile.h" /* for overlay functions */ |
| #endif |
| |
| #include "version.h" |
| |
| #include "floatformat.h" |
| |
| /* Convenience macro for allocting typesafe memory. */ |
| |
| #ifndef XMALLOC |
| #define XMALLOC(TYPE) (TYPE*) xmalloc (sizeof (TYPE)) |
| #endif |
| |
| |
| /* Use the program counter to determine the contents and size |
| of a breakpoint instruction. If no target-dependent macro |
| BREAKPOINT_FROM_PC has been defined to implement this function, |
| assume that the breakpoint doesn't depend on the PC, and |
| use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros. |
| Return a pointer to a string of bytes that encode a breakpoint |
| instruction, stores the length of the string to *lenptr, |
| and optionally adjust the pc to point to the correct memory location |
| for inserting the breakpoint. */ |
| |
| unsigned char * |
| legacy_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr) |
| { |
| /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a |
| breakpoint. On some machines, breakpoints are handled by the |
| target environment and we don't have to worry about them here. */ |
| #ifdef BIG_BREAKPOINT |
| if (TARGET_BYTE_ORDER == BIG_ENDIAN) |
| { |
| static unsigned char big_break_insn[] = BIG_BREAKPOINT; |
| *lenptr = sizeof (big_break_insn); |
| return big_break_insn; |
| } |
| #endif |
| #ifdef LITTLE_BREAKPOINT |
| if (TARGET_BYTE_ORDER != BIG_ENDIAN) |
| { |
| static unsigned char little_break_insn[] = LITTLE_BREAKPOINT; |
| *lenptr = sizeof (little_break_insn); |
| return little_break_insn; |
| } |
| #endif |
| #ifdef BREAKPOINT |
| { |
| static unsigned char break_insn[] = BREAKPOINT; |
| *lenptr = sizeof (break_insn); |
| return break_insn; |
| } |
| #endif |
| *lenptr = 0; |
| return NULL; |
| } |
| |
| int |
| generic_frameless_function_invocation_not (struct frame_info *fi) |
| { |
| return 0; |
| } |
| |
| int |
| generic_return_value_on_stack_not (struct type *type) |
| { |
| return 0; |
| } |
| |
| char * |
| legacy_register_name (int i) |
| { |
| #ifdef REGISTER_NAMES |
| static char *names[] = REGISTER_NAMES; |
| if (i < 0 || i >= (sizeof (names) / sizeof (*names))) |
| return NULL; |
| else |
| return names[i]; |
| #else |
| internal_error ("legacy_register_name: called."); |
| return NULL; |
| #endif |
| } |
| |
| #if defined (CALL_DUMMY) |
| LONGEST legacy_call_dummy_words[] = CALL_DUMMY; |
| #else |
| LONGEST legacy_call_dummy_words[1]; |
| #endif |
| int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words); |
| |
| void |
| generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len, |
| CORE_ADDR * rem_addr, int *rem_len) |
| { |
| *rem_addr = gdb_addr; |
| *rem_len = gdb_len; |
| } |
| |
| int |
| generic_prologue_frameless_p (CORE_ADDR ip) |
| { |
| #ifdef SKIP_PROLOGUE_FRAMELESS_P |
| return ip == SKIP_PROLOGUE_FRAMELESS_P (ip); |
| #else |
| return ip == SKIP_PROLOGUE (ip); |
| #endif |
| } |
| |
| |
| /* Helper functions for INNER_THAN */ |
| |
| int |
| core_addr_lessthan (lhs, rhs) |
| CORE_ADDR lhs; |
| CORE_ADDR rhs; |
| { |
| return (lhs < rhs); |
| } |
| |
| int |
| core_addr_greaterthan (lhs, rhs) |
| CORE_ADDR lhs; |
| CORE_ADDR rhs; |
| { |
| return (lhs > rhs); |
| } |
| |
| |
| /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */ |
| |
| const struct floatformat * |
| default_float_format (struct gdbarch *gdbarch) |
| { |
| #if GDB_MULTI_ARCH |
| int byte_order = gdbarch_byte_order (gdbarch); |
| #else |
| int byte_order = TARGET_BYTE_ORDER; |
| #endif |
| switch (byte_order) |
| { |
| case BIG_ENDIAN: |
| return &floatformat_ieee_single_big; |
| case LITTLE_ENDIAN: |
| return &floatformat_ieee_single_little; |
| default: |
| internal_error ("default_float_format: bad byte order"); |
| } |
| } |
| |
| |
| const struct floatformat * |
| default_double_format (struct gdbarch *gdbarch) |
| { |
| #if GDB_MULTI_ARCH |
| int byte_order = gdbarch_byte_order (gdbarch); |
| #else |
| int byte_order = TARGET_BYTE_ORDER; |
| #endif |
| switch (byte_order) |
| { |
| case BIG_ENDIAN: |
| return &floatformat_ieee_double_big; |
| case LITTLE_ENDIAN: |
| return &floatformat_ieee_double_little; |
| default: |
| internal_error ("default_double_format: bad byte order"); |
| } |
| } |
| |
| /* Misc helper functions for targets. */ |
| |
| int |
| frame_num_args_unknown (fi) |
| struct frame_info *fi; |
| { |
| return -1; |
| } |
| |
| |
| int |
| generic_register_convertible_not (num) |
| int num; |
| { |
| return 0; |
| } |
| |
| |
| /* 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 |
| #if !TARGET_BYTE_ORDER_SELECTABLE_P |
| #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 |
| #endif |
| #ifndef TARGET_BYTE_ORDER_DEFAULT |
| #define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */ |
| #endif |
| /* ``target_byte_order'' is only used when non- multi-arch. |
| Multi-arch targets obtain the current byte order using |
| TARGET_BYTE_ORDER which is controlled by gdbarch.*. */ |
| int target_byte_order = TARGET_BYTE_ORDER_DEFAULT; |
| int target_byte_order_auto = 1; |
| |
| static const char endian_big[] = "big"; |
| static const char endian_little[] = "little"; |
| static const char endian_auto[] = "auto"; |
| static const char *endian_enum[] = |
| { |
| endian_big, |
| endian_little, |
| endian_auto, |
| NULL, |
| }; |
| static const char *set_endian_string; |
| |
| /* Called by ``show endian''. */ |
| |
| static void |
| show_endian (char *args, int from_tty) |
| { |
| if (TARGET_BYTE_ORDER_AUTO) |
| printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n", |
| (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little")); |
| else |
| printf_unfiltered ("The target is assumed to be %s endian\n", |
| (TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little")); |
| } |
| |
| static void |
| set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c) |
| { |
| if (!TARGET_BYTE_ORDER_SELECTABLE_P) |
| { |
| printf_unfiltered ("Byte order is not selectable."); |
| } |
| else if (set_endian_string == endian_auto) |
| { |
| target_byte_order_auto = 1; |
| } |
| else if (set_endian_string == endian_little) |
| { |
| target_byte_order_auto = 0; |
| if (GDB_MULTI_ARCH) |
| { |
| struct gdbarch_info info; |
| memset (&info, 0, sizeof info); |
| info.byte_order = LITTLE_ENDIAN; |
| gdbarch_update (info); |
| } |
| else |
| { |
| target_byte_order = LITTLE_ENDIAN; |
| } |
| } |
| else if (set_endian_string == endian_big) |
| { |
| target_byte_order_auto = 0; |
| if (GDB_MULTI_ARCH) |
| { |
| struct gdbarch_info info; |
| memset (&info, 0, sizeof info); |
| info.byte_order = BIG_ENDIAN; |
| gdbarch_update (info); |
| } |
| else |
| { |
| target_byte_order = BIG_ENDIAN; |
| } |
| } |
| else |
| internal_error ("set_endian: bad value"); |
| show_endian (NULL, from_tty); |
| } |
| |
| /* Set the endianness from a BFD. */ |
| |
| static void |
| set_endian_from_file (bfd *abfd) |
| { |
| if (GDB_MULTI_ARCH) |
| internal_error ("set_endian_from_file: not for multi-arch"); |
| 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 */ |
| |
| enum set_arch { set_arch_auto, set_arch_manual }; |
| |
| int target_architecture_auto = 1; |
| |
| const char *set_architecture_string; |
| |
| /* Old way of changing the current architecture. */ |
| |
| 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) (const struct bfd_arch_info *ap); |
| |
| static int |
| arch_ok (const struct bfd_arch_info *arch) |
| { |
| if (GDB_MULTI_ARCH) |
| internal_error ("arch_ok: not multi-arched"); |
| /* Should be performing the more basic check that the binary is |
| compatible with GDB. */ |
| /* Check with the target that the architecture is valid. */ |
| return (target_architecture_hook == NULL |
| || target_architecture_hook (arch)); |
| } |
| |
| static void |
| set_arch (const struct bfd_arch_info *arch, |
| enum set_arch type) |
| { |
| if (GDB_MULTI_ARCH) |
| internal_error ("set_arch: not multi-arched"); |
| switch (type) |
| { |
| case set_arch_auto: |
| if (!arch_ok (arch)) |
| warning ("Target may not support %s architecture", |
| arch->printable_name); |
| target_architecture = arch; |
| break; |
| case set_arch_manual: |
| if (!arch_ok (arch)) |
| { |
| printf_unfiltered ("Target does not support `%s' architecture.\n", |
| arch->printable_name); |
| } |
| else |
| { |
| target_architecture_auto = 0; |
| target_architecture = arch; |
| } |
| break; |
| } |
| if (gdbarch_debug) |
| gdbarch_dump (current_gdbarch, gdb_stdlog); |
| } |
| |
| /* Set the architecture from arch/machine (deprecated) */ |
| |
| void |
| set_architecture_from_arch_mach (enum bfd_architecture arch, |
| unsigned long mach) |
| { |
| const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach); |
| if (GDB_MULTI_ARCH) |
| internal_error ("set_architecture_from_arch_mach: not multi-arched"); |
| if (wanted != NULL) |
| set_arch (wanted, set_arch_manual); |
| else |
| internal_error ("gdbarch: hardwired architecture/machine not reconized"); |
| } |
| |
| /* Set the architecture from a BFD (deprecated) */ |
| |
| static void |
| set_architecture_from_file (bfd *abfd) |
| { |
| const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd); |
| if (GDB_MULTI_ARCH) |
| internal_error ("set_architecture_from_file: not multi-arched"); |
| if (target_architecture_auto) |
| { |
| set_arch (wanted, set_arch_auto); |
| } |
| else if (wanted != target_architecture) |
| { |
| warning ("%s architecture file may be incompatible with %s target.", |
| wanted->printable_name, |
| target_architecture->printable_name); |
| } |
| } |
| |
| |
| /* Called if the user enters ``show architecture'' without an |
| argument. */ |
| |
| static void |
| show_architecture (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 (char *ignore_args, int from_tty, struct cmd_list_element *c) |
| { |
| if (strcmp (set_architecture_string, "auto") == 0) |
| { |
| target_architecture_auto = 1; |
| } |
| else if (GDB_MULTI_ARCH) |
| { |
| struct gdbarch_info info; |
| memset (&info, 0, sizeof info); |
| info.bfd_arch_info = bfd_scan_arch (set_architecture_string); |
| if (info.bfd_arch_info == NULL) |
| internal_error ("set_architecture: bfd_scan_arch failed"); |
| if (gdbarch_update (info)) |
| target_architecture_auto = 0; |
| else |
| printf_unfiltered ("Architecture `%s' not reconized.\n", |
| set_architecture_string); |
| } |
| else |
| { |
| const struct bfd_arch_info *arch |
| = bfd_scan_arch (set_architecture_string); |
| if (arch == NULL) |
| internal_error ("set_architecture: bfd_scan_arch failed"); |
| set_arch (arch, set_arch_manual); |
| } |
| show_architecture (NULL, from_tty); |
| } |
| |
| /* Called if the user enters ``info architecture'' without an argument. */ |
| |
| static void |
| info_architecture (char *args, int from_tty) |
| { |
| printf_filtered ("Available architectures are:\n"); |
| if (GDB_MULTI_ARCH) |
| { |
| const char **arches = gdbarch_printable_names (); |
| const char **arch; |
| for (arch = arches; *arch != NULL; arch++) |
| { |
| printf_filtered (" %s", *arch); |
| } |
| free (arches); |
| } |
| else |
| { |
| enum bfd_architecture a; |
| for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++) |
| { |
| const struct bfd_arch_info *ap; |
| for (ap = bfd_lookup_arch (a, 0); |
| ap != NULL; |
| ap = ap->next) |
| { |
| printf_filtered (" %s", ap->printable_name); |
| ap = ap->next; |
| } |
| } |
| } |
| printf_filtered ("\n"); |
| } |
| |
| /* Set the dynamic target-system-dependant parameters (architecture, |
| byte-order) using information found in the BFD */ |
| |
| void |
| set_gdbarch_from_file (abfd) |
| bfd *abfd; |
| { |
| if (GDB_MULTI_ARCH) |
| { |
| struct gdbarch_info info; |
| memset (&info, 0, sizeof info); |
| info.abfd = abfd; |
| gdbarch_update (info); |
| } |
| else |
| { |
| set_architecture_from_file (abfd); |
| set_endian_from_file (abfd); |
| } |
| } |
| |
| /* Initialize the current architecture. Update the ``set |
| architecture'' command so that it specifies a list of valid |
| architectures. */ |
| |
| #ifdef DEFAULT_BFD_ARCH |
| extern const bfd_arch_info_type DEFAULT_BFD_ARCH; |
| static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH; |
| #else |
| static const bfd_arch_info_type *default_bfd_arch; |
| #endif |
| |
| #ifdef DEFAULT_BFD_VEC |
| extern const bfd_target DEFAULT_BFD_VEC; |
| static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC; |
| #else |
| static const bfd_target *default_bfd_vec; |
| #endif |
| |
| void |
| initialize_current_architecture (void) |
| { |
| const char **arches = gdbarch_printable_names (); |
| |
| /* determine a default architecture and byte order. */ |
| struct gdbarch_info info; |
| memset (&info, 0, sizeof (info)); |
| |
| /* Find a default architecture. */ |
| if (info.bfd_arch_info == NULL |
| && default_bfd_arch != NULL) |
| info.bfd_arch_info = default_bfd_arch; |
| if (info.bfd_arch_info == NULL) |
| { |
| /* Choose the architecture by taking the first one |
| alphabetically. */ |
| const char *chosen = arches[0]; |
| const char **arch; |
| for (arch = arches; *arch != NULL; arch++) |
| { |
| if (strcmp (*arch, chosen) < 0) |
| chosen = *arch; |
| } |
| if (chosen == NULL) |
| internal_error ("initialize_current_architecture: No arch"); |
| info.bfd_arch_info = bfd_scan_arch (chosen); |
| if (info.bfd_arch_info == NULL) |
| internal_error ("initialize_current_architecture: Arch not found"); |
| } |
| |
| /* take several guesses at a byte order. */ |
| /* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is |
| forced above. */ |
| if (info.byte_order == 0 |
| && default_bfd_vec != NULL) |
| { |
| /* Extract BFD's default vector's byte order. */ |
| switch (default_bfd_vec->byteorder) |
| { |
| case BFD_ENDIAN_BIG: |
| info.byte_order = BIG_ENDIAN; |
| break; |
| case BFD_ENDIAN_LITTLE: |
| info.byte_order = LITTLE_ENDIAN; |
| break; |
| default: |
| break; |
| } |
| } |
| if (info.byte_order == 0) |
| { |
| /* look for ``*el-*'' in the target name. */ |
| const char *chp; |
| chp = strchr (target_name, '-'); |
| if (chp != NULL |
| && chp - 2 >= target_name |
| && strncmp (chp - 2, "el", 2) == 0) |
| info.byte_order = LITTLE_ENDIAN; |
| } |
| if (info.byte_order == 0) |
| { |
| /* Wire it to big-endian!!! */ |
| info.byte_order = BIG_ENDIAN; |
| } |
| |
| if (GDB_MULTI_ARCH) |
| { |
| gdbarch_update (info); |
| } |
| |
| /* Create the ``set architecture'' command appending ``auto'' to the |
| list of architectures. */ |
| { |
| struct cmd_list_element *c; |
| /* Append ``auto''. */ |
| int nr; |
| for (nr = 0; arches[nr] != NULL; nr++); |
| arches = xrealloc (arches, sizeof (char*) * (nr + 2)); |
| arches[nr + 0] = "auto"; |
| arches[nr + 1] = NULL; |
| /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead |
| of ``const char *''. We just happen to know that the casts are |
| safe. */ |
| c = add_set_enum_cmd ("architecture", class_support, |
| (char **) arches, (char **) &set_architecture_string, |
| "Set architecture of target.", |
| &setlist); |
| c->function.sfunc = set_architecture; |
| add_alias_cmd ("processor", "architecture", class_support, 1, &setlist); |
| /* Don't use set_from_show - need to print both auto/manual and |
| current setting. */ |
| add_cmd ("architecture", class_support, show_architecture, |
| "Show the current target architecture", &showlist); |
| c = add_cmd ("architecture", class_support, info_architecture, |
| "List supported target architectures", &infolist); |
| deprecate_cmd (c, "set architecture"); |
| } |
| } |
| |
| |
| /* */ |
| |
| extern initialize_file_ftype _initialize_gdbarch_utils; |
| |
| void |
| _initialize_gdbarch_utils (void) |
| { |
| struct cmd_list_element *c; |
| c = add_set_enum_cmd ("endian", class_support, |
| (char **) endian_enum, (char **) &set_endian_string, |
| "Set endianness of target.", |
| &setlist); |
| c->function.sfunc = set_endian; |
| /* Don't use set_from_show - need to print both auto/manual and |
| current setting. */ |
| add_cmd ("endian", class_support, show_endian, |
| "Show the current byte-order", &showlist); |
| } |