735 lines
20 KiB
C
735 lines
20 KiB
C
/* Dynamic architecture support for GDB, the GNU debugger.
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Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
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Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "buildsym.h"
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#include "gdbcmd.h"
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#include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
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#include "gdb_string.h"
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#include "regcache.h"
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#include "gdb_assert.h"
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#include "sim-regno.h"
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#include "gdbcore.h"
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#include "osabi.h"
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#include "version.h"
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#include "floatformat.h"
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/* Implementation of extract return value that grubs around in the
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register cache. */
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void
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legacy_extract_return_value (struct type *type, struct regcache *regcache,
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void *valbuf)
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{
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char *registers = deprecated_grub_regcache_for_registers (regcache);
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bfd_byte *buf = valbuf;
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DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */
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}
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/* Implementation of store return value that grubs the register cache.
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Takes a local copy of the buffer to avoid const problems. */
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void
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legacy_store_return_value (struct type *type, struct regcache *regcache,
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const void *buf)
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{
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bfd_byte *b = alloca (TYPE_LENGTH (type));
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gdb_assert (regcache == current_regcache);
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memcpy (b, buf, TYPE_LENGTH (type));
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DEPRECATED_STORE_RETURN_VALUE (type, b);
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}
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int
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always_use_struct_convention (int gcc_p, struct type *value_type)
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{
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return 1;
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}
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enum return_value_convention
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legacy_return_value (struct gdbarch *gdbarch, struct type *valtype,
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struct regcache *regcache, void *readbuf,
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const void *writebuf)
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{
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/* NOTE: cagney/2004-06-13: The gcc_p parameter to
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USE_STRUCT_CONVENTION isn't used. */
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int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
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|| TYPE_CODE (valtype) == TYPE_CODE_UNION
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|| TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
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&& DEPRECATED_USE_STRUCT_CONVENTION (0, valtype));
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if (writebuf != NULL)
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{
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gdb_assert (!struct_return);
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/* NOTE: cagney/2004-06-13: See stack.c:return_command. Old
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architectures don't expect STORE_RETURN_VALUE to handle small
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structures. Should not be called with such types. */
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gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_STRUCT
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&& TYPE_CODE (valtype) != TYPE_CODE_UNION);
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STORE_RETURN_VALUE (valtype, regcache, writebuf);
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}
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if (readbuf != NULL)
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{
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gdb_assert (!struct_return);
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EXTRACT_RETURN_VALUE (valtype, regcache, readbuf);
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}
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if (struct_return)
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return RETURN_VALUE_STRUCT_CONVENTION;
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else
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return RETURN_VALUE_REGISTER_CONVENTION;
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}
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int
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legacy_register_sim_regno (int regnum)
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{
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/* Only makes sense to supply raw registers. */
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gdb_assert (regnum >= 0 && regnum < NUM_REGS);
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/* NOTE: cagney/2002-05-13: The old code did it this way and it is
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suspected that some GDB/SIM combinations may rely on this
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behavour. The default should be one2one_register_sim_regno
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(below). */
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if (REGISTER_NAME (regnum) != NULL
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&& REGISTER_NAME (regnum)[0] != '\0')
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return regnum;
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else
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return LEGACY_SIM_REGNO_IGNORE;
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}
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CORE_ADDR
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generic_skip_trampoline_code (CORE_ADDR pc)
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{
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return 0;
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}
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CORE_ADDR
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generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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return 0;
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}
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int
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generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
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{
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return 0;
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}
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int
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generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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return 0;
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}
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void
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generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
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struct regcache *regcache,
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CORE_ADDR gdb_addr, int gdb_len,
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CORE_ADDR * rem_addr, int *rem_len)
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{
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*rem_addr = gdb_addr;
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*rem_len = gdb_len;
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}
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/* Helper functions for INNER_THAN */
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int
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core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
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{
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return (lhs < rhs);
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}
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int
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core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
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{
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return (lhs > rhs);
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}
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/* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
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const struct floatformat *
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default_float_format (struct gdbarch *gdbarch)
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{
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int byte_order = gdbarch_byte_order (gdbarch);
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switch (byte_order)
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{
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case BFD_ENDIAN_BIG:
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return &floatformat_ieee_single_big;
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case BFD_ENDIAN_LITTLE:
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return &floatformat_ieee_single_little;
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default:
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internal_error (__FILE__, __LINE__,
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"default_float_format: bad byte order");
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}
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}
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const struct floatformat *
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default_double_format (struct gdbarch *gdbarch)
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{
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int byte_order = gdbarch_byte_order (gdbarch);
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switch (byte_order)
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{
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case BFD_ENDIAN_BIG:
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return &floatformat_ieee_double_big;
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case BFD_ENDIAN_LITTLE:
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return &floatformat_ieee_double_little;
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default:
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internal_error (__FILE__, __LINE__,
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"default_double_format: bad byte order");
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}
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}
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/* Misc helper functions for targets. */
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CORE_ADDR
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core_addr_identity (CORE_ADDR addr)
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{
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return addr;
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}
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CORE_ADDR
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convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
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struct target_ops *targ)
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{
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return addr;
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}
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int
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no_op_reg_to_regnum (int reg)
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{
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return reg;
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}
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void
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default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
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{
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return;
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}
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void
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default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
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{
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return;
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}
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int
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cannot_register_not (int regnum)
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{
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return 0;
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}
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/* Legacy version of target_virtual_frame_pointer(). Assumes that
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there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
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raw. */
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void
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legacy_virtual_frame_pointer (CORE_ADDR pc,
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int *frame_regnum,
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LONGEST *frame_offset)
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{
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/* FIXME: cagney/2002-09-13: This code is used when identifying the
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frame pointer of the current PC. It is assuming that a single
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register and an offset can determine this. I think it should
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instead generate a byte code expression as that would work better
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with things like Dwarf2's CFI. */
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if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
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*frame_regnum = DEPRECATED_FP_REGNUM;
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else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
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*frame_regnum = SP_REGNUM;
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else
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/* Should this be an internal error? I guess so, it is reflecting
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an architectural limitation in the current design. */
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internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
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*frame_offset = 0;
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}
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/* Assume the world is sane, every register's virtual and real size
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is identical. */
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int
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generic_register_size (int regnum)
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{
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gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
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return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
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}
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/* Assume all registers are adjacent. */
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int
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generic_register_byte (int regnum)
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{
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int byte;
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int i;
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gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
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byte = 0;
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for (i = 0; i < regnum; i++)
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{
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byte += generic_register_size (i);
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}
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return byte;
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}
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int
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legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
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{
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#if defined (DEPRECATED_IN_SIGTRAMP)
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return DEPRECATED_IN_SIGTRAMP (pc, name);
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#else
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return name && strcmp ("_sigtramp", name) == 0;
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#endif
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}
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int
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generic_convert_register_p (int regnum, struct type *type)
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{
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return 0;
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}
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int
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default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
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{
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if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
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&& DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
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{
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CHECK_TYPEDEF (type);
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return (TYPE_CODE (type) == TYPE_CODE_STRUCT
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|| TYPE_CODE (type) == TYPE_CODE_UNION
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|| TYPE_CODE (type) == TYPE_CODE_SET
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|| TYPE_CODE (type) == TYPE_CODE_BITSTRING);
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}
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return 0;
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}
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int
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generic_instruction_nullified (struct gdbarch *gdbarch,
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struct regcache *regcache)
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{
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return 0;
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}
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/* Functions to manipulate the endianness of the target. */
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/* ``target_byte_order'' is only used when non- multi-arch.
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Multi-arch targets obtain the current byte order using the
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TARGET_BYTE_ORDER gdbarch method.
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The choice of initial value is entirely arbitrary. During startup,
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the function initialize_current_architecture() updates this value
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based on default byte-order information extracted from BFD. */
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static int target_byte_order = BFD_ENDIAN_BIG;
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static int target_byte_order_auto = 1;
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enum bfd_endian
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selected_byte_order (void)
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{
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if (target_byte_order_auto)
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return BFD_ENDIAN_UNKNOWN;
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else
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return target_byte_order;
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}
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static const char endian_big[] = "big";
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static const char endian_little[] = "little";
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static const char endian_auto[] = "auto";
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static const char *endian_enum[] =
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{
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endian_big,
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endian_little,
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endian_auto,
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NULL,
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};
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static const char *set_endian_string;
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/* Called by ``show endian''. */
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static void
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show_endian (char *args, int from_tty)
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{
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if (target_byte_order_auto)
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printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
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(TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
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else
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printf_unfiltered ("The target is assumed to be %s endian\n",
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(TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
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}
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static void
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set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
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{
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if (set_endian_string == endian_auto)
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{
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target_byte_order_auto = 1;
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}
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else if (set_endian_string == endian_little)
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{
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struct gdbarch_info info;
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target_byte_order_auto = 0;
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gdbarch_info_init (&info);
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info.byte_order = BFD_ENDIAN_LITTLE;
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if (! gdbarch_update_p (info))
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printf_unfiltered ("Little endian target not supported by GDB\n");
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}
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else if (set_endian_string == endian_big)
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{
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struct gdbarch_info info;
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target_byte_order_auto = 0;
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gdbarch_info_init (&info);
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info.byte_order = BFD_ENDIAN_BIG;
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if (! gdbarch_update_p (info))
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printf_unfiltered ("Big endian target not supported by GDB\n");
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}
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else
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internal_error (__FILE__, __LINE__,
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"set_endian: bad value");
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show_endian (NULL, from_tty);
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}
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/* Functions to manipulate the architecture of the target */
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enum set_arch { set_arch_auto, set_arch_manual };
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static int target_architecture_auto = 1;
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static const char *set_architecture_string;
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const char *
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selected_architecture_name (void)
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{
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if (target_architecture_auto)
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return NULL;
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else
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return set_architecture_string;
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}
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/* Called if the user enters ``show architecture'' without an
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argument. */
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static void
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show_architecture (char *args, int from_tty)
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{
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const char *arch;
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arch = TARGET_ARCHITECTURE->printable_name;
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if (target_architecture_auto)
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printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
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else
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printf_filtered ("The target architecture is assumed to be %s\n", arch);
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}
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/* Called if the user enters ``set architecture'' with or without an
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argument. */
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static void
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set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
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{
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if (strcmp (set_architecture_string, "auto") == 0)
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{
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target_architecture_auto = 1;
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}
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else
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{
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struct gdbarch_info info;
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gdbarch_info_init (&info);
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info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
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if (info.bfd_arch_info == NULL)
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internal_error (__FILE__, __LINE__,
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"set_architecture: bfd_scan_arch failed");
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if (gdbarch_update_p (info))
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target_architecture_auto = 0;
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else
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printf_unfiltered ("Architecture `%s' not recognized.\n",
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set_architecture_string);
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}
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show_architecture (NULL, from_tty);
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}
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/* Try to select a global architecture that matches "info". Return
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non-zero if the attempt succeds. */
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int
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gdbarch_update_p (struct gdbarch_info info)
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{
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struct gdbarch *new_gdbarch = gdbarch_find_by_info (info);
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/* If there no architecture by that name, reject the request. */
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if (new_gdbarch == NULL)
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{
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if (gdbarch_debug)
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fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
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"Architecture not found\n");
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return 0;
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}
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/* If it is the same old architecture, accept the request (but don't
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swap anything). */
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if (new_gdbarch == current_gdbarch)
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{
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if (gdbarch_debug)
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fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
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"Architecture 0x%08lx (%s) unchanged\n",
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(long) new_gdbarch,
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gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
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return 1;
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}
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/* It's a new architecture, swap it in. */
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if (gdbarch_debug)
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fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
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"New architecture 0x%08lx (%s) selected\n",
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(long) new_gdbarch,
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gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
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deprecated_current_gdbarch_select_hack (new_gdbarch);
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return 1;
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}
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/* Return the architecture for ABFD. If no suitable architecture
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could be find, return NULL. */
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struct gdbarch *
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gdbarch_from_bfd (bfd *abfd)
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{
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struct gdbarch *old_gdbarch = current_gdbarch;
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struct gdbarch *new_gdbarch;
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struct gdbarch_info info;
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gdbarch_info_init (&info);
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info.abfd = abfd;
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return gdbarch_find_by_info (info);
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}
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/* Set the dynamic target-system-dependent parameters (architecture,
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byte-order) using information found in the BFD */
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void
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set_gdbarch_from_file (bfd *abfd)
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{
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struct gdbarch *gdbarch;
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gdbarch = gdbarch_from_bfd (abfd);
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if (gdbarch == NULL)
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error ("Architecture of file not recognized.\n");
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deprecated_current_gdbarch_select_hack (gdbarch);
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}
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/* 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);
|
||
}
|