derek.holloway
7502bf64a4
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57 lines
2.3 KiB
C
57 lines
2.3 KiB
C
/* Target description related code for GNU/Linux i386.
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Copyright (C) 2024 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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#include "arch/x86-linux-tdesc.h"
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#include "arch/i386-linux-tdesc.h"
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#include "arch/i386.h"
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#include "arch/x86-linux-tdesc-features.h"
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/* See arch/i386-linux-tdesc.h. */
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const target_desc *
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i386_linux_read_description (uint64_t xcr0)
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{
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/* Cache of previously seen i386 target descriptions, indexed by the xcr0
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value that created the target description. This needs to be static
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within this function to ensure it is initialised before first use. */
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static std::unordered_map<uint64_t, const target_desc_up> i386_tdesc_cache;
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/* Only some bits are checked when creating a tdesc, but the XCR0 value
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contains other feature bits that are not relevant for tdesc creation.
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When indexing into the I386_TDESC_CACHE we need to use a consistent
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xcr0 value otherwise we might fail to find an existing tdesc which has
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the same set of relevant bits set. */
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xcr0 &= x86_linux_i386_xcr0_feature_mask ();
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const auto it = i386_tdesc_cache.find (xcr0);
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if (it != i386_tdesc_cache.end ())
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return it->second.get ();
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/* Create the previously unseen target description. */
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target_desc_up tdesc (i386_create_target_description (xcr0, true, false));
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x86_linux_post_init_tdesc (tdesc.get (), false);
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/* Add to the cache, and return a pointer borrowed from the
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target_desc_up. This is safe as the cache (and the pointers contained
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within it) are not deleted until GDB exits. */
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target_desc *ptr = tdesc.get ();
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i386_tdesc_cache.emplace (xcr0, std::move (tdesc));
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return ptr;
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}
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