| /* Dynamic architecture support for GDB, the GNU debugger. |
| |
| Copyright 1998, 1999, 2000, 2001, 2002, 2003 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 "arch-utils.h" |
| #include "gdbcmd.h" |
| #include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */ |
| #include "gdb_string.h" |
| #include "regcache.h" |
| #include "gdb_assert.h" |
| #include "sim-regno.h" |
| |
| #include "version.h" |
| |
| #include "floatformat.h" |
| |
| /* Implementation of extract return value that grubs around in the |
| register cache. */ |
| void |
| legacy_extract_return_value (struct type *type, struct regcache *regcache, |
| void *valbuf) |
| { |
| char *registers = deprecated_grub_regcache_for_registers (regcache); |
| bfd_byte *buf = valbuf; |
| DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */ |
| } |
| |
| /* Implementation of store return value that grubs the register cache. |
| Takes a local copy of the buffer to avoid const problems. */ |
| void |
| legacy_store_return_value (struct type *type, struct regcache *regcache, |
| const void *buf) |
| { |
| bfd_byte *b = alloca (TYPE_LENGTH (type)); |
| gdb_assert (regcache == current_regcache); |
| memcpy (b, buf, TYPE_LENGTH (type)); |
| DEPRECATED_STORE_RETURN_VALUE (type, b); |
| } |
| |
| |
| int |
| always_use_struct_convention (int gcc_p, struct type *value_type) |
| { |
| return 1; |
| } |
| |
| |
| int |
| legacy_register_sim_regno (int regnum) |
| { |
| /* Only makes sense to supply raw registers. */ |
| gdb_assert (regnum >= 0 && regnum < NUM_REGS); |
| /* NOTE: cagney/2002-05-13: The old code did it this way and it is |
| suspected that some GDB/SIM combinations may rely on this |
| behavour. The default should be one2one_register_sim_regno |
| (below). */ |
| if (REGISTER_NAME (regnum) != NULL |
| && REGISTER_NAME (regnum)[0] != '\0') |
| return regnum; |
| else |
| return LEGACY_SIM_REGNO_IGNORE; |
| } |
| |
| int |
| generic_frameless_function_invocation_not (struct frame_info *fi) |
| { |
| return 0; |
| } |
| |
| int |
| generic_return_value_on_stack_not (struct type *type) |
| { |
| return 0; |
| } |
| |
| CORE_ADDR |
| generic_skip_trampoline_code (CORE_ADDR pc) |
| { |
| return 0; |
| } |
| |
| int |
| generic_in_solib_call_trampoline (CORE_ADDR pc, char *name) |
| { |
| return 0; |
| } |
| |
| int |
| generic_in_solib_return_trampoline (CORE_ADDR pc, char *name) |
| { |
| return 0; |
| } |
| |
| int |
| generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| { |
| return 0; |
| } |
| |
| #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 (struct gdbarch *gdbarch, |
| struct regcache *regcache, |
| 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) |
| { |
| return ip == SKIP_PROLOGUE (ip); |
| } |
| |
| /* Helper functions for INNER_THAN */ |
| |
| int |
| core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs) |
| { |
| return (lhs < rhs); |
| } |
| |
| int |
| core_addr_greaterthan (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) |
| { |
| int byte_order = gdbarch_byte_order (gdbarch); |
| switch (byte_order) |
| { |
| case BFD_ENDIAN_BIG: |
| return &floatformat_ieee_single_big; |
| case BFD_ENDIAN_LITTLE: |
| return &floatformat_ieee_single_little; |
| default: |
| internal_error (__FILE__, __LINE__, |
| "default_float_format: bad byte order"); |
| } |
| } |
| |
| |
| const struct floatformat * |
| default_double_format (struct gdbarch *gdbarch) |
| { |
| int byte_order = gdbarch_byte_order (gdbarch); |
| switch (byte_order) |
| { |
| case BFD_ENDIAN_BIG: |
| return &floatformat_ieee_double_big; |
| case BFD_ENDIAN_LITTLE: |
| return &floatformat_ieee_double_little; |
| default: |
| internal_error (__FILE__, __LINE__, |
| "default_double_format: bad byte order"); |
| } |
| } |
| |
| /* Misc helper functions for targets. */ |
| |
| int |
| deprecated_register_convertible_not (int num) |
| { |
| return 0; |
| } |
| |
| |
| /* Under some ABI's that specify the `struct convention' for returning |
| structures by value, by the time we've returned from the function, |
| the return value is sitting there in the caller's buffer, but GDB |
| has no way to find the address of that buffer. |
| |
| On such architectures, use this function as your |
| extract_struct_value_address method. When asked to a struct |
| returned by value in this fashion, GDB will print a nice error |
| message, instead of garbage. */ |
| CORE_ADDR |
| generic_cannot_extract_struct_value_address (char *dummy) |
| { |
| return 0; |
| } |
| |
| CORE_ADDR |
| core_addr_identity (CORE_ADDR addr) |
| { |
| return addr; |
| } |
| |
| int |
| no_op_reg_to_regnum (int reg) |
| { |
| return reg; |
| } |
| |
| CORE_ADDR |
| init_frame_pc_noop (int fromleaf, struct frame_info *prev) |
| { |
| /* Do nothing, implies return the same PC value. */ |
| return get_frame_pc (prev); |
| } |
| |
| CORE_ADDR |
| init_frame_pc_default (int fromleaf, struct frame_info *prev) |
| { |
| if (fromleaf && DEPRECATED_SAVED_PC_AFTER_CALL_P ()) |
| return DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev)); |
| else if (get_next_frame (prev) != NULL) |
| return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev)); |
| else |
| return read_pc (); |
| } |
| |
| void |
| default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym) |
| { |
| return; |
| } |
| |
| void |
| default_coff_make_msymbol_special (int val, struct minimal_symbol *msym) |
| { |
| return; |
| } |
| |
| int |
| cannot_register_not (int regnum) |
| { |
| return 0; |
| } |
| |
| /* Legacy version of target_virtual_frame_pointer(). Assumes that |
| there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or |
| raw. */ |
| |
| void |
| legacy_virtual_frame_pointer (CORE_ADDR pc, |
| int *frame_regnum, |
| LONGEST *frame_offset) |
| { |
| /* FIXME: cagney/2002-09-13: This code is used when identifying the |
| frame pointer of the current PC. It is assuming that a single |
| register and an offset can determine this. I think it should |
| instead generate a byte code expression as that would work better |
| with things like Dwarf2's CFI. */ |
| if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS) |
| *frame_regnum = DEPRECATED_FP_REGNUM; |
| else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS) |
| *frame_regnum = SP_REGNUM; |
| else |
| /* Should this be an internal error? I guess so, it is reflecting |
| an architectural limitation in the current design. */ |
| internal_error (__FILE__, __LINE__, "No virtual frame pointer available"); |
| *frame_offset = 0; |
| } |
| |
| /* Assume the world is sane, every register's virtual and real size |
| is identical. */ |
| |
| int |
| generic_register_size (int regnum) |
| { |
| gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS); |
| if (gdbarch_register_type_p (current_gdbarch)) |
| return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum)); |
| else |
| /* FIXME: cagney/2003-03-01: Once all architectures implement |
| gdbarch_register_type(), this entire function can go away. It |
| is made obsolete by register_size(). */ |
| return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum)); /* OK */ |
| } |
| |
| /* Assume all registers are adjacent. */ |
| |
| int |
| generic_register_byte (int regnum) |
| { |
| int byte; |
| int i; |
| gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS); |
| byte = 0; |
| for (i = 0; i < regnum; i++) |
| { |
| byte += generic_register_size (i); |
| } |
| return byte; |
| } |
| |
| |
| int |
| legacy_pc_in_sigtramp (CORE_ADDR pc, char *name) |
| { |
| #if !defined (IN_SIGTRAMP) |
| if (SIGTRAMP_START_P ()) |
| return (pc) >= SIGTRAMP_START (pc) && (pc) < SIGTRAMP_END (pc); |
| else |
| return name && strcmp ("_sigtramp", name) == 0; |
| #else |
| return IN_SIGTRAMP (pc, name); |
| #endif |
| } |
| |
| int |
| legacy_convert_register_p (int regnum, struct type *type) |
| { |
| return DEPRECATED_REGISTER_CONVERTIBLE (regnum); |
| } |
| |
| void |
| legacy_register_to_value (struct frame_info *frame, int regnum, |
| struct type *type, void *to) |
| { |
| char from[MAX_REGISTER_SIZE]; |
| frame_read_register (frame, regnum, from); |
| DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to); |
| } |
| |
| void |
| legacy_value_to_register (struct frame_info *frame, int regnum, |
| struct type *type, const void *tmp) |
| { |
| char to[MAX_REGISTER_SIZE]; |
| char *from = alloca (TYPE_LENGTH (type)); |
| memcpy (from, from, TYPE_LENGTH (type)); |
| DEPRECATED_REGISTER_CONVERT_TO_RAW (type, regnum, from, to); |
| put_frame_register (frame, regnum, to); |
| } |
| |
| |
| /* Functions to manipulate the endianness of the target. */ |
| |
| /* ``target_byte_order'' is only used when non- multi-arch. |
| Multi-arch targets obtain the current byte order using the |
| TARGET_BYTE_ORDER gdbarch method. |
| |
| The choice of initial value is entirely arbitrary. During startup, |
| the function initialize_current_architecture() updates this value |
| based on default byte-order information extracted from BFD. */ |
| int target_byte_order = BFD_ENDIAN_BIG; |
| 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 == BFD_ENDIAN_BIG ? "big" : "little")); |
| else |
| printf_unfiltered ("The target is assumed to be %s endian\n", |
| (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little")); |
| } |
| |
| static void |
| set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c) |
| { |
| if (set_endian_string == endian_auto) |
| { |
| target_byte_order_auto = 1; |
| } |
| else if (set_endian_string == endian_little) |
| { |
| struct gdbarch_info info; |
| target_byte_order_auto = 0; |
| gdbarch_info_init (&info); |
| info.byte_order = BFD_ENDIAN_LITTLE; |
| if (! gdbarch_update_p (info)) |
| printf_unfiltered ("Little endian target not supported by GDB\n"); |
| } |
| else if (set_endian_string == endian_big) |
| { |
| struct gdbarch_info info; |
| target_byte_order_auto = 0; |
| gdbarch_info_init (&info); |
| info.byte_order = BFD_ENDIAN_BIG; |
| if (! gdbarch_update_p (info)) |
| printf_unfiltered ("Big endian target not supported by GDB\n"); |
| } |
| else |
| internal_error (__FILE__, __LINE__, |
| "set_endian: bad value"); |
| show_endian (NULL, from_tty); |
| } |
| |
| /* 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; |
| |
| /* 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 |
| { |
| struct gdbarch_info info; |
| gdbarch_info_init (&info); |
| info.bfd_arch_info = bfd_scan_arch (set_architecture_string); |
| if (info.bfd_arch_info == NULL) |
| internal_error (__FILE__, __LINE__, |
| "set_architecture: bfd_scan_arch failed"); |
| if (gdbarch_update_p (info)) |
| target_architecture_auto = 0; |
| else |
| printf_unfiltered ("Architecture `%s' not recognized.\n", |
| set_architecture_string); |
| } |
| show_architecture (NULL, from_tty); |
| } |
| |
| /* Set the dynamic target-system-dependent parameters (architecture, |
| byte-order) using information found in the BFD */ |
| |
| void |
| set_gdbarch_from_file (bfd *abfd) |
| { |
| struct gdbarch_info info; |
| gdbarch_info_init (&info); |
| info.abfd = abfd; |
| if (! gdbarch_update_p (info)) |
| error ("Architecture of file not recognized.\n"); |
| } |
| |
| /* 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; |
| gdbarch_info_init (&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 (__FILE__, __LINE__, |
| "initialize_current_architecture: No arch"); |
| info.bfd_arch_info = bfd_scan_arch (chosen); |
| if (info.bfd_arch_info == NULL) |
| internal_error (__FILE__, __LINE__, |
| "initialize_current_architecture: Arch not found"); |
| } |
| |
| /* Take several guesses at a byte order. */ |
| if (info.byte_order == BFD_ENDIAN_UNKNOWN |
| && default_bfd_vec != NULL) |
| { |
| /* Extract BFD's default vector's byte order. */ |
| switch (default_bfd_vec->byteorder) |
| { |
| case BFD_ENDIAN_BIG: |
| info.byte_order = BFD_ENDIAN_BIG; |
| break; |
| case BFD_ENDIAN_LITTLE: |
| info.byte_order = BFD_ENDIAN_LITTLE; |
| break; |
| default: |
| break; |
| } |
| } |
| if (info.byte_order == BFD_ENDIAN_UNKNOWN) |
| { |
| /* 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 = BFD_ENDIAN_LITTLE; |
| } |
| if (info.byte_order == BFD_ENDIAN_UNKNOWN) |
| { |
| /* Wire it to big-endian!!! */ |
| info.byte_order = BFD_ENDIAN_BIG; |
| } |
| |
| if (! gdbarch_update_p (info)) |
| internal_error (__FILE__, __LINE__, |
| "initialize_current_architecture: Selection of initial architecture failed"); |
| |
| /* 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, |
| arches, &set_architecture_string, |
| "Set architecture of target.", |
| &setlist); |
| set_cmd_sfunc (c, 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); |
| } |
| } |
| |
| |
| /* Initialize a gdbarch info to values that will be automatically |
| overridden. Note: Originally, this ``struct info'' was initialized |
| using memset(0). Unfortunatly, that ran into problems, namely |
| BFD_ENDIAN_BIG is zero. An explicit initialization function that |
| can explicitly set each field to a well defined value is used. */ |
| |
| void |
| gdbarch_info_init (struct gdbarch_info *info) |
| { |
| memset (info, 0, sizeof (struct gdbarch_info)); |
| info->byte_order = BFD_ENDIAN_UNKNOWN; |
| info->osabi = GDB_OSABI_UNINITIALIZED; |
| } |
| |
| /* */ |
| |
| extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */ |
| |
| void |
| _initialize_gdbarch_utils (void) |
| { |
| struct cmd_list_element *c; |
| c = add_set_enum_cmd ("endian", class_support, |
| endian_enum, &set_endian_string, |
| "Set endianness of target.", |
| &setlist); |
| set_cmd_sfunc (c, 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); |
| } |