derek.holloway
7502bf64a4
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67 lines
2.6 KiB
C
67 lines
2.6 KiB
C
/* Target description related code for GNU/Linux x86-64.
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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/amd64-linux-tdesc.h"
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#include "arch/amd64.h"
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#include "arch/x86-linux-tdesc-features.h"
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/* See arch/amd64-linux-tdesc.h. */
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const struct target_desc *
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amd64_linux_read_description (uint64_t xcr0, bool is_x32)
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{
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/* The type used for the amd64 and x32 target description caches. */
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using tdesc_cache_type = std::unordered_map<uint64_t, const target_desc_up>;
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/* Caches for the previously seen amd64 and x32 target descriptions,
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indexed by the xcr0 value that created the target description. These
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need to be static within this function to ensure they are initialised
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before first use. */
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static tdesc_cache_type amd64_tdesc_cache, x32_tdesc_cache;
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tdesc_cache_type &tdesc_cache = is_x32 ? x32_tdesc_cache : amd64_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 TDESC_CACHE we need to use a consistent xcr0
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value otherwise we might fail to find an existing tdesc which has the
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same set of relevant bits set. */
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xcr0 &= is_x32
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? x86_linux_x32_xcr0_feature_mask ()
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: x86_linux_amd64_xcr0_feature_mask ();
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const auto it = tdesc_cache.find (xcr0);
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if (it != 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 (amd64_create_target_description (xcr0, is_x32,
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true, true));
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x86_linux_post_init_tdesc (tdesc.get (), true);
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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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tdesc_cache.emplace (xcr0, std::move (tdesc));
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return ptr;
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}
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