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257 lines
9.3 KiB
C++
257 lines
9.3 KiB
C++
/* Target description support for GDB.
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Copyright (C) 2006-2021 Free Software Foundation, Inc.
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Contributed by CodeSourcery.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#ifndef TARGET_DESCRIPTIONS_H
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#define TARGET_DESCRIPTIONS_H 1
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#include "gdbsupport/tdesc.h"
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#include "gdbarch.h"
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struct tdesc_arch_data;
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struct target_ops;
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/* An inferior's target description info is stored in this opaque
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object. There's one such object per inferior. */
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struct target_desc_info;
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struct inferior;
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/* Fetch the current inferior's description, and switch its current
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architecture to one which incorporates that description. */
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void target_find_description (void);
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/* Discard any description fetched from the target for the current
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inferior, and switch the current architecture to one with no target
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description. */
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void target_clear_description (void);
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/* Return the current inferior's target description. This should only
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be used by gdbarch initialization code; most access should be
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through an existing gdbarch. */
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const struct target_desc *target_current_description (void);
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/* Copy inferior target description data. Used for example when
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handling (v)forks, where child's description is the same as the
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parent's, since the child really is a copy of the parent. */
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void copy_inferior_target_desc_info (struct inferior *destinf,
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struct inferior *srcinf);
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/* Free a target_desc_info object. */
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void target_desc_info_free (struct target_desc_info *tdesc_info);
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/* Returns true if INFO indicates the target description had been
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supplied by the user. */
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int target_desc_info_from_user_p (struct target_desc_info *info);
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/* Record architecture-specific functions to call for pseudo-register
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support. If tdesc_use_registers is called and gdbarch_num_pseudo_regs
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is greater than zero, then these should be called as well.
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They are equivalent to the gdbarch methods with similar names,
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except that they will only be called for pseudo registers. */
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void set_tdesc_pseudo_register_name
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(struct gdbarch *gdbarch, gdbarch_register_name_ftype *pseudo_name);
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void set_tdesc_pseudo_register_type
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(struct gdbarch *gdbarch, gdbarch_register_type_ftype *pseudo_type);
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void set_tdesc_pseudo_register_reggroup_p
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(struct gdbarch *gdbarch,
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gdbarch_register_reggroup_p_ftype *pseudo_reggroup_p);
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/* Pointer to a function that should be called for each unknown register in
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a target description, used by TDESC_USE_REGISTERS.
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GDBARCH is the architecture the target description is for, FEATURE is
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the feature the unknown register is in, and REG_NAME is the name of the
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register from the target description. The POSSIBLE_REGNUM is a proposed
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(GDB internal) number for this register.
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The callback function can return, (-1) to indicate that the register
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should not be assigned POSSIBLE_REGNUM now (though it might be later),
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GDB will number the register automatically later on. Return
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POSSIBLE_REGNUM (or greater) to have this register assigned that number.
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Returning a value less that POSSIBLE_REGNUM is also acceptable, but take
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care not to clash with a register number that has already been
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assigned.
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The callback will always be called on the registers in the order they
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appear in the target description. This means all unknown registers
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within a single feature will be called one after another. */
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typedef int (*tdesc_unknown_register_ftype)
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(struct gdbarch *gdbarch, tdesc_feature *feature,
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const char *reg_name, int possible_regnum);
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/* A deleter adapter for a target arch data. */
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struct tdesc_arch_data_deleter
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{
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void operator() (struct tdesc_arch_data *data) const;
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};
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/* A unique pointer specialization that holds a target_desc. */
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typedef std::unique_ptr<tdesc_arch_data, tdesc_arch_data_deleter>
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tdesc_arch_data_up;
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/* Update GDBARCH to use the TARGET_DESC for registers. TARGET_DESC
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may be GDBARCH's target description or (if GDBARCH does not have
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one which describes registers) another target description
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constructed by the gdbarch initialization routine.
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Fixed register assignments are taken from EARLY_DATA, which is freed.
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All registers which have not been assigned fixed numbers are given
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numbers above the current value of gdbarch_num_regs.
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gdbarch_num_regs and various register-related predicates are updated to
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refer to the target description. This function should only be called from
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the architecture's gdbarch initialization routine, and only after
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successfully validating the required registers. */
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void tdesc_use_registers (struct gdbarch *gdbarch,
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const struct target_desc *target_desc,
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tdesc_arch_data_up &&early_data,
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tdesc_unknown_register_ftype unk_reg_cb = NULL);
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/* Allocate initial data for validation of a target description during
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gdbarch initialization. */
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tdesc_arch_data_up tdesc_data_alloc ();
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/* Search FEATURE for a register named NAME. Record REGNO and the
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register in DATA; when tdesc_use_registers is called, REGNO will be
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assigned to the register. 1 is returned if the register was found,
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0 if it was not. */
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int tdesc_numbered_register (const struct tdesc_feature *feature,
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struct tdesc_arch_data *data,
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int regno, const char *name);
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/* Search FEATURE for a register named NAME, but do not assign a fixed
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register number to it. */
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int tdesc_unnumbered_register (const struct tdesc_feature *feature,
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const char *name);
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/* Search FEATURE for a register named NAME, and return its size in
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bits. The register must exist. */
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int tdesc_register_bitsize (const struct tdesc_feature *feature,
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const char *name);
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/* Search FEATURE for a register with any of the names from NAMES
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(NULL-terminated). Record REGNO and the register in DATA; when
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tdesc_use_registers is called, REGNO will be assigned to the
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register. 1 is returned if the register was found, 0 if it was
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not. */
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int tdesc_numbered_register_choices (const struct tdesc_feature *feature,
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struct tdesc_arch_data *data,
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int regno, const char *const names[]);
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/* Accessors for target descriptions. */
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/* Return the BFD architecture associated with this target
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description, or NULL if no architecture was specified. */
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const struct bfd_arch_info *tdesc_architecture
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(const struct target_desc *);
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/* Return the OSABI associated with this target description, or
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GDB_OSABI_UNKNOWN if no osabi was specified. */
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enum gdb_osabi tdesc_osabi (const struct target_desc *);
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/* Return non-zero if this target description is compatible
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with the given BFD architecture. */
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int tdesc_compatible_p (const struct target_desc *,
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const struct bfd_arch_info *);
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/* Return the string value of a property named KEY, or NULL if the
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property was not specified. */
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const char *tdesc_property (const struct target_desc *,
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const char *key);
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/* Return 1 if this target description describes any registers. */
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int tdesc_has_registers (const struct target_desc *);
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/* Return the feature with the given name, if present, or NULL if
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the named feature is not found. */
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const struct tdesc_feature *tdesc_find_feature (const struct target_desc *,
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const char *name);
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/* Return the name of FEATURE. */
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const char *tdesc_feature_name (const struct tdesc_feature *feature);
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/* Return the name of register REGNO, from the target description or
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from an architecture-provided pseudo_register_name method. */
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const char *tdesc_register_name (struct gdbarch *gdbarch, int regno);
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/* Return the type of register REGNO, from the target description or
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from an architecture-provided pseudo_register_type method. */
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struct type *tdesc_register_type (struct gdbarch *gdbarch, int regno);
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/* Return the type associated with ID, from the target description. */
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struct type *tdesc_find_type (struct gdbarch *gdbarch, const char *id);
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/* Check whether REGNUM is a member of REGGROUP using the target
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description. Return -1 if the target description does not
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specify a group. */
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int tdesc_register_in_reggroup_p (struct gdbarch *gdbarch, int regno,
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struct reggroup *reggroup);
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/* Methods for constructing a target description. */
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void set_tdesc_architecture (struct target_desc *,
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const struct bfd_arch_info *);
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void set_tdesc_osabi (struct target_desc *, enum gdb_osabi osabi);
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void set_tdesc_property (struct target_desc *,
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const char *key, const char *value);
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void tdesc_add_compatible (struct target_desc *,
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const struct bfd_arch_info *);
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#if GDB_SELF_TEST
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namespace selftests {
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/* Record that XML_FILE should generate a target description that equals
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TDESC, to be verified by the "maintenance check xml-descriptions"
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command. This function takes ownership of TDESC. */
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void record_xml_tdesc (const char *xml_file,
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const struct target_desc *tdesc);
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}
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#endif
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#endif /* TARGET_DESCRIPTIONS_H */
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