/* Dynamic architecture support for GDB, the GNU debugger. Copyright 1998, 1999, 2000, 2001 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 "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 "annotate.h" #endif #include "version.h" #include "floatformat.h" /* 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 (__FILE__, __LINE__, "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 (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) { #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 (__FILE__, __LINE__, "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 (__FILE__, __LINE__, "default_double_format: bad byte order"); } } /* Misc helper functions for targets. */ int frame_num_args_unknown (struct frame_info *fi) { return -1; } int generic_register_convertible_not (int num) { return 0; } int default_register_sim_regno (int num) { return num; } CORE_ADDR default_convert_from_func_ptr_addr (CORE_ADDR addr) { return addr; } int no_op_reg_to_regnum (int reg) { return reg; } /* For use by frame_args_address and frame_locals_address. */ CORE_ADDR default_frame_address (struct frame_info *fi) { return fi->frame; } /* Default prepare_to_procced(). */ int default_prepare_to_proceed (int select_it) { return 0; } /* Generic prepare_to_proceed(). This one should be suitable for most targets that support threads. */ int generic_prepare_to_proceed (int select_it) { int wait_pid; struct target_waitstatus wait_status; /* Get the last target status returned by target_wait(). */ get_last_target_status (&wait_pid, &wait_status); /* Make sure we were stopped at a breakpoint. */ if (wait_status.kind != TARGET_WAITKIND_STOPPED || wait_status.value.sig != TARGET_SIGNAL_TRAP) { return 0; } if (wait_pid != -1 && inferior_pid != wait_pid) { /* Switched over from WAIT_PID. */ CORE_ADDR wait_pc = read_pc_pid (wait_pid); /* Avoid switching where it wouldn't do any good, i.e. if both threads are at the same breakpoint. */ if (wait_pc != read_pc () && breakpoint_here_p (wait_pc)) { if (select_it) { /* User hasn't deleted the breakpoint. Switch back to WAIT_PID and return non-zero. */ inferior_pid = wait_pid; /* FIXME: This stuff came from switch_to_thread() in thread.c (which should probably be a public function). */ flush_cached_frames (); registers_changed (); stop_pc = wait_pc; select_frame (get_current_frame (), 0); } return 1; } } 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; if (! gdbarch_update_p (info)) { printf_unfiltered ("Little endian target not supported by GDB\n"); } } 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; if (! gdbarch_update_p (info)) { printf_unfiltered ("Big endian target not supported by GDB\n"); } } else { target_byte_order = BIG_ENDIAN; } } else internal_error (__FILE__, __LINE__, "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 (__FILE__, __LINE__, "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 (__FILE__, __LINE__, "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 (__FILE__, __LINE__, "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 (__FILE__, __LINE__, "set_architecture_from_arch_mach: not multi-arched"); if (wanted != NULL) set_arch (wanted, set_arch_manual); else internal_error (__FILE__, __LINE__, "gdbarch: hardwired architecture/machine not recognized"); } /* 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 (__FILE__, __LINE__, "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 (__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); } else { const struct bfd_arch_info *arch = bfd_scan_arch (set_architecture_string); if (arch == NULL) internal_error (__FILE__, __LINE__, "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); } xfree (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-dependent parameters (architecture, byte-order) using information found in the BFD */ void set_gdbarch_from_file (bfd *abfd) { if (GDB_MULTI_ARCH) { struct gdbarch_info info; memset (&info, 0, sizeof info); info.abfd = abfd; if (! gdbarch_update_p (info)) error ("Architecture of file not recognized.\n"); } 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 (__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. */ /* 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) { 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); 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, endian_enum, &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); }