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Diffstat (limited to 'gdb/arch-utils.c')
| -rw-r--r-- | gdb/arch-utils.c | 757 |
1 files changed, 757 insertions, 0 deletions
diff --git a/gdb/arch-utils.c b/gdb/arch-utils.c new file mode 100644 index 00000000000..d7a9b302b55 --- /dev/null +++ b/gdb/arch-utils.c @@ -0,0 +1,757 @@ +/* Dynamic architecture support for GDB, the GNU debugger. + + Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 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 "buildsym.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 "gdbcore.h" +#include "osabi.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; +} + +enum return_value_convention +legacy_return_value (struct gdbarch *gdbarch, struct type *valtype, + struct regcache *regcache, void *readbuf, + const void *writebuf) +{ + /* NOTE: cagney/2004-06-13: The gcc_p parameter to + USE_STRUCT_CONVENTION isn't used. */ + int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT + || TYPE_CODE (valtype) == TYPE_CODE_UNION + || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) + && DEPRECATED_USE_STRUCT_CONVENTION (0, valtype)); + + if (writebuf != NULL) + { + gdb_assert (!struct_return); + /* NOTE: cagney/2004-06-13: See stack.c:return_command. Old + architectures don't expect STORE_RETURN_VALUE to handle small + structures. Should not be called with such types. */ + gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_STRUCT + && TYPE_CODE (valtype) != TYPE_CODE_UNION); + STORE_RETURN_VALUE (valtype, regcache, writebuf); + } + + if (readbuf != NULL) + { + gdb_assert (!struct_return); + EXTRACT_RETURN_VALUE (valtype, regcache, readbuf); + } + + if (struct_return) + return RETURN_VALUE_STRUCT_CONVENTION; + else + return RETURN_VALUE_REGISTER_CONVENTION; +} + +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; +} + +CORE_ADDR +generic_skip_trampoline_code (CORE_ADDR pc) +{ + return 0; +} + +CORE_ADDR +generic_skip_solib_resolver (struct gdbarch *gdbarch, 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; +} + +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; +} + +/* 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. */ + +CORE_ADDR +core_addr_identity (CORE_ADDR addr) +{ + return addr; +} + +CORE_ADDR +convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr, + struct target_ops *targ) +{ + return addr; +} + +int +no_op_reg_to_regnum (int reg) +{ + return reg; +} + +CORE_ADDR +deprecated_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 (); +} + +int +dwarf_never_simplify_pieces (int num_pieces, + struct dwarf_expr_piece *pieces) +{ + return -1; +} + +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 (DEPRECATED_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 (DEPRECATED_IN_SIGTRAMP) + return DEPRECATED_IN_SIGTRAMP (pc, name); +#else + return name && strcmp ("_sigtramp", name) == 0; +#endif +} + +int +generic_convert_register_p (int regnum, struct type *type) +{ + return 0; +} + +int +default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) +{ + if (DEPRECATED_REG_STRUCT_HAS_ADDR_P () + && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type)) + { + CHECK_TYPEDEF (type); + + return (TYPE_CODE (type) == TYPE_CODE_STRUCT + || TYPE_CODE (type) == TYPE_CODE_UNION + || TYPE_CODE (type) == TYPE_CODE_SET + || TYPE_CODE (type) == TYPE_CODE_BITSTRING); + } + + return 0; +} + + +/* 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. */ +static int target_byte_order = BFD_ENDIAN_BIG; +static int target_byte_order_auto = 1; + +enum bfd_endian +selected_byte_order (void) +{ + if (target_byte_order_auto) + return BFD_ENDIAN_UNKNOWN; + else + return target_byte_order; +} + +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 }; + +static int target_architecture_auto = 1; + +static const char *set_architecture_string; + +const char * +selected_architecture_name (void) +{ + if (target_architecture_auto) + return NULL; + else + return 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); +} + +/* Try to select a global architecture that matches "info". Return + non-zero if the attempt succeds. */ +int +gdbarch_update_p (struct gdbarch_info info) +{ + struct gdbarch *new_gdbarch = gdbarch_find_by_info (info); + + /* If there no architecture by that name, reject the request. */ + if (new_gdbarch == NULL) + { + if (gdbarch_debug) + fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " + "Architecture not found\n"); + return 0; + } + + /* If it is the same old architecture, accept the request (but don't + swap anything). */ + if (new_gdbarch == current_gdbarch) + { + if (gdbarch_debug) + fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " + "Architecture 0x%08lx (%s) unchanged\n", + (long) new_gdbarch, + gdbarch_bfd_arch_info (new_gdbarch)->printable_name); + return 1; + } + + /* It's a new architecture, swap it in. */ + if (gdbarch_debug) + fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: " + "New architecture 0x%08lx (%s) selected\n", + (long) new_gdbarch, + gdbarch_bfd_arch_info (new_gdbarch)->printable_name); + deprecated_current_gdbarch_select_hack (new_gdbarch); + + return 1; +} + +/* Return the architecture for ABFD. If no suitable architecture + could be find, return NULL. */ + +struct gdbarch * +gdbarch_from_bfd (bfd *abfd) +{ + struct gdbarch *old_gdbarch = current_gdbarch; + struct gdbarch *new_gdbarch; + struct gdbarch_info info; + + gdbarch_info_init (&info); + info.abfd = abfd; + return gdbarch_find_by_info (info); +} + +/* 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 *gdbarch; + + gdbarch = gdbarch_from_bfd (abfd); + if (gdbarch == NULL) + error ("Architecture of file not recognized.\n"); + deprecated_current_gdbarch_select_hack (gdbarch); +} + +/* 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). Unfortunately, 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; +} + +/* Similar to init, but this time fill in the blanks. Information is + obtained from the specified architecture, global "set ..." options, + and explicitly initialized INFO fields. */ + +void +gdbarch_info_fill (struct gdbarch *gdbarch, struct gdbarch_info *info) +{ + /* "(gdb) set architecture ...". */ + if (info->bfd_arch_info == NULL + && !target_architecture_auto + && gdbarch != NULL) + info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch); + if (info->bfd_arch_info == NULL + && info->abfd != NULL + && bfd_get_arch (info->abfd) != bfd_arch_unknown + && bfd_get_arch (info->abfd) != bfd_arch_obscure) + info->bfd_arch_info = bfd_get_arch_info (info->abfd); + if (info->bfd_arch_info == NULL + && gdbarch != NULL) + info->bfd_arch_info = gdbarch_bfd_arch_info (gdbarch); + + /* "(gdb) set byte-order ...". */ + if (info->byte_order == BFD_ENDIAN_UNKNOWN + && !target_byte_order_auto + && gdbarch != NULL) + info->byte_order = gdbarch_byte_order (gdbarch); + /* From the INFO struct. */ + if (info->byte_order == BFD_ENDIAN_UNKNOWN + && info->abfd != NULL) + info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG + : bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE + : BFD_ENDIAN_UNKNOWN); + /* From the current target. */ + if (info->byte_order == BFD_ENDIAN_UNKNOWN + && gdbarch != NULL) + info->byte_order = gdbarch_byte_order (gdbarch); + + /* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */ + if (info->osabi == GDB_OSABI_UNINITIALIZED) + info->osabi = gdbarch_lookup_osabi (info->abfd); + if (info->osabi == GDB_OSABI_UNINITIALIZED + && gdbarch != NULL) + info->osabi = gdbarch_osabi (gdbarch); + + /* Must have at least filled in the architecture. */ + gdb_assert (info->bfd_arch_info != NULL); +} + +/* */ + +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); +} |