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Diffstat (limited to 'contrib/gdb/gdb/arch-utils.c')
| -rw-r--r-- | contrib/gdb/gdb/arch-utils.c | 861 |
1 files changed, 861 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/arch-utils.c b/contrib/gdb/gdb/arch-utils.c new file mode 100644 index 0000000..5612ddf --- /dev/null +++ b/contrib/gdb/gdb/arch-utils.c @@ -0,0 +1,861 @@ +/* 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 "arch-utils.h" +#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 "regcache.h" +#include "gdb_assert.h" + +#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 == BFD_ENDIAN_BIG) + { + 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 != BFD_ENDIAN_BIG) + { + 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; +} + +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_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) +{ + 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 +} + +/* New/multi-arched targets should use the correct gdbarch field + instead of using this global pointer. */ +int +legacy_print_insn (bfd_vma vma, disassemble_info *info) +{ + return (*tm_print_insn) (vma, info); +} + +/* 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 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) +{ +#if GDB_MULTI_ARCH + int byte_order = gdbarch_byte_order (gdbarch); +#else + int byte_order = TARGET_BYTE_ORDER; +#endif + 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"); + } +} + +void +default_print_float_info (void) +{ +#ifdef FLOAT_INFO +#if GDB_MULTI_ARCH > GDB_MULTI_ARCH_PARTIAL +#error "FLOAT_INFO defined in multi-arch" +#endif + FLOAT_INFO; +#else + printf_filtered ("No floating point info available for this processor.\n"); +#endif +} + +/* 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; +} + + +/* 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; +} + +int +default_register_sim_regno (int num) +{ + return num; +} + + +CORE_ADDR +core_addr_identity (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) +{ + ptid_t wait_ptid; + struct target_waitstatus wait_status; + + /* Get the last target status returned by target_wait(). */ + get_last_target_status (&wait_ptid, &wait_status); + + /* Make sure we were stopped either at a breakpoint, or because + of a Ctrl-C. */ + if (wait_status.kind != TARGET_WAITKIND_STOPPED + || (wait_status.value.sig != TARGET_SIGNAL_TRAP && + wait_status.value.sig != TARGET_SIGNAL_INT)) + { + return 0; + } + + if (!ptid_equal (wait_ptid, minus_one_ptid) + && !ptid_equal (inferior_ptid, wait_ptid)) + { + /* Switched over from WAIT_PID. */ + CORE_ADDR wait_pc = read_pc_pid (wait_ptid); + + if (wait_pc != read_pc ()) + { + if (select_it) + { + /* Switch back to WAIT_PID thread. */ + inferior_ptid = wait_ptid; + + /* 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); + } + /* We return 1 to indicate that there is a breakpoint here, + so we need to step over it before continuing to avoid + hitting it straight away. */ + if (breakpoint_here_p (wait_pc)) + { + return 1; + } + } + } + return 0; + +} + +void +init_frame_pc_noop (int fromleaf, struct frame_info *prev) +{ + return; +} + +void +init_frame_pc_default (int fromleaf, struct frame_info *prev) +{ + if (fromleaf) + prev->pc = SAVED_PC_AFTER_CALL (prev->next); + else if (prev->next != NULL) + prev->pc = FRAME_SAVED_PC (prev->next); + else + prev->pc = 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 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) +{ + gdb_assert (FP_REGNUM >= 0); + *frame_regnum = FP_REGNUM; + *frame_offset = 0; +} + +/* Assume the world is flat. Every register is large enough to fit a + target integer. */ + +int +generic_register_raw_size (int regnum) +{ + gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS); + return TARGET_INT_BIT / HOST_CHAR_BIT; +} + +/* Assume the virtual size corresponds to the virtual type. */ + +int +generic_register_virtual_size (int regnum) +{ + return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum)); +} + + +/* 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) + { + target_byte_order_auto = 0; + if (GDB_MULTI_ARCH) + { + struct gdbarch_info info; + 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 + { + target_byte_order = BFD_ENDIAN_LITTLE; + } + } + else if (set_endian_string == endian_big) + { + target_byte_order_auto = 0; + if (GDB_MULTI_ARCH) + { + struct gdbarch_info info; + 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 + { + target_byte_order = BFD_ENDIAN_BIG; + } + } + 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) +{ + int want; + if (GDB_MULTI_ARCH) + internal_error (__FILE__, __LINE__, + "set_endian_from_file: not for multi-arch"); + if (bfd_big_endian (abfd)) + want = BFD_ENDIAN_BIG; + else + want = BFD_ENDIAN_LITTLE; + 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 == BFD_ENDIAN_BIG ? "big" : "little", + TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "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; + 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); + } + 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); +} + +/* 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; + gdbarch_info_init (&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; + 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 (GDB_MULTI_ARCH) + { + if (! gdbarch_update_p (info)) + { + internal_error (__FILE__, __LINE__, + "initialize_current_architecture: Selection of initial architecture failed"); + } + } + else + { + /* If the multi-arch logic comes up with a byte-order (from BFD) + use it for the non-multi-arch case. */ + if (info.byte_order != BFD_ENDIAN_UNKNOWN) + target_byte_order = info.byte_order; + initialize_non_multiarch (); + } + + /* 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; +} + +/* */ + +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); + 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); +} |
