90 lines
3.3 KiB
C
90 lines
3.3 KiB
C
/* Cache and manage the values of registers
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Copyright (C) 2014-2022 Free Software 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 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 COMMON_COMMON_REGCACHE_H
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#define COMMON_COMMON_REGCACHE_H
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/* This header is a stopgap until we have an independent regcache. */
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enum register_status : signed char
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{
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/* The register value is not in the cache, and we don't know yet
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whether it's available in the target (or traceframe). */
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REG_UNKNOWN = 0,
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/* The register value is valid and cached. */
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REG_VALID = 1,
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/* The register value is unavailable. E.g., we're inspecting a
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traceframe, and this register wasn't collected. Note that this
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is different a different "unavailable" from saying the register
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does not exist in the target's architecture --- in that case,
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the target should have given us a target description that does
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not include the register in the first place. */
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REG_UNAVAILABLE = -1
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};
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/* Return a pointer to the register cache associated with the
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thread specified by PTID. This function must be provided by
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the client. */
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extern struct regcache *get_thread_regcache_for_ptid (ptid_t ptid);
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/* Return the size of register numbered N in REGCACHE. This function
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must be provided by the client. */
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extern int regcache_register_size (const struct regcache *regcache, int n);
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/* Read the PC register. This function must be provided by the
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client. */
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extern CORE_ADDR regcache_read_pc (struct regcache *regcache);
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/* Read the PC register. If PC cannot be read, return 0.
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This is a wrapper around 'regcache_read_pc'. */
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extern CORE_ADDR regcache_read_pc_protected (regcache *regcache);
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/* Read a raw register into a unsigned integer. */
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extern enum register_status regcache_raw_read_unsigned
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(struct regcache *regcache, int regnum, ULONGEST *val);
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ULONGEST regcache_raw_get_unsigned (struct regcache *regcache, int regnum);
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struct reg_buffer_common
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{
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virtual ~reg_buffer_common () = default;
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/* Get the availability status of the value of register REGNUM in this
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buffer. */
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virtual register_status get_register_status (int regnum) const = 0;
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/* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE. */
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virtual void raw_supply (int regnum, const void *buf) = 0;
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/* Collect register REGNUM from REGCACHE and store its contents in BUF. */
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virtual void raw_collect (int regnum, void *buf) const = 0;
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/* Compare the contents of the register stored in the regcache (ignoring the
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first OFFSET bytes) to the contents of BUF (without any offset). Returns
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true if the same. */
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virtual bool raw_compare (int regnum, const void *buf, int offset) const = 0;
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};
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#endif /* COMMON_COMMON_REGCACHE_H */
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