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aarch64: Add aarch64-specific files for memory tagging support
This final patch provides the architecture-specific implementation of the memory-tagging support hooks for aarch64.
This commit is contained in:
Richard Earnshaw
parent
bde4949b6b
commit
d27f0e5d88
@ -40,4 +40,9 @@ endif
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ifeq ($(subdir),misc)
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sysdep_headers += sys/ifunc.h
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sysdep_routines += __mtag_address_get_tag \
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__mtag_memset_tag \
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__mtag_new_tag \
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__mtag_tag_region
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endif
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32
sysdeps/aarch64/__mtag_address_get_tag.S
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32
sysdeps/aarch64/__mtag_address_get_tag.S
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@ -0,0 +1,32 @@
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/* Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#ifdef USE_MTAG
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#define ptr x0
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.arch armv8.5-a
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.arch_extension memtag
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ENTRY (__libc_mtag_address_get_tag)
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ldg ptr, [ptr]
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ret
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END (__libc_mtag_address_get_tag)
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#endif /* USE_MTAG */
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53
sysdeps/aarch64/__mtag_memset_tag.S
Normal file
53
sysdeps/aarch64/__mtag_memset_tag.S
Normal file
@ -0,0 +1,53 @@
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/* Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#ifdef USE_MTAG
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/* Use the same register names and assignments as memset. */
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#include "memset-reg.h"
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.arch armv8.5-a
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.arch_extension memtag
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/* NB, only supported on variants with 64-bit pointers. */
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/* FIXME: This is a minimal implementation. We could do much better than
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this for large values of COUNT. */
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ENTRY(__libc_mtag_memset_with_tag)
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and valw, valw, 255
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orr valw, valw, valw, lsl 8
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orr valw, valw, valw, lsl 16
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orr val, val, val, lsl 32
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mov dst, dstin
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L(loop):
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stgp val, val, [dst], #16
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subs count, count, 16
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bne L(loop)
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#if 0
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/* This is not currently needed, since for now we are only called
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to tag memory that is taggable. */
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ldg dstin, [dstin] // Recover the tag created (might be untagged).
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#endif
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ret
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END (__libc_mtag_memset_with_tag)
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#endif /* USE_MTAG */
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37
sysdeps/aarch64/__mtag_new_tag.S
Normal file
37
sysdeps/aarch64/__mtag_new_tag.S
Normal file
@ -0,0 +1,37 @@
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/* Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#ifdef USE_MTAG
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.arch armv8.5-a
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.arch_extension memtag
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/* NB, only supported on variants with 64-bit pointers. */
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#define ptr x0
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#define xset x1
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ENTRY(__libc_mtag_new_tag)
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// Guarantee that the new tag is not the same as now.
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gmi xset, ptr, xzr
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irg ptr, ptr, xset
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ret
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END (__libc_mtag_new_tag)
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#endif /* USE_MTAG */
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51
sysdeps/aarch64/__mtag_tag_region.S
Normal file
51
sysdeps/aarch64/__mtag_tag_region.S
Normal file
@ -0,0 +1,51 @@
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/* Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#ifdef USE_MTAG
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/* Use the same register names and assignments as memset. */
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.arch armv8.5-a
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.arch_extension memtag
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/* NB, only supported on variants with 64-bit pointers. */
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/* FIXME: This is a minimal implementation. We could do better than
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this for larger values of COUNT. */
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#define dstin x0
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#define count x1
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#define dst x2
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ENTRY_ALIGN(__libc_mtag_tag_region, 6)
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mov dst, dstin
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L(loop):
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stg dst, [dst], #16
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subs count, count, 16
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bne L(loop)
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#if 0
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/* This is not currently needed, since for now we are only called
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to tag memory that is taggable. */
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ldg dstin, [dstin] // Recover the tag created (might be untagged).
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#endif
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ret
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END (__libc_mtag_tag_region)
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#endif /* USE_MTAG */
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57
sysdeps/aarch64/libc-mtag.h
Normal file
57
sysdeps/aarch64/libc-mtag.h
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@ -0,0 +1,57 @@
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/* libc-internal interface for tagged (colored) memory support.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _AARCH64_LIBC_MTAG_H
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#define _AARCH64_LIBC_MTAG_H 1
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#ifndef USE_MTAG
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/* Generic bindings for systems that do not support memory tagging. */
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#include_next "libc-mtag.h"
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#else
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/* Used to ensure additional alignment when objects need to have distinct
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tags. */
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#define __MTAG_GRANULE_SIZE 16
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/* Non-zero if memory obtained via morecore (sbrk) is not tagged. */
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#define __MTAG_SBRK_UNTAGGED 1
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/* Extra flags to pass to mmap to get tagged pages. */
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#define __MTAG_MMAP_FLAGS PROT_MTE
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/* Set the tags for a region of memory, which must have size and alignment
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that are multiples of __MTAG_GRANULE_SIZE. Size cannot be zero.
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void *__libc_mtag_tag_region (const void *, size_t) */
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void *__libc_mtag_tag_region (void *, size_t);
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/* Optimized equivalent to __libc_mtag_tag_region followed by memset. */
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void *__libc_mtag_memset_with_tag (void *, int, size_t);
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/* Convert address P to a pointer that is tagged correctly for that
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location.
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void *__libc_mtag_address_get_tag (void*) */
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void *__libc_mtag_address_get_tag (void *);
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/* Assign a new (random) tag to a pointer P (does not adjust the tag on
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the memory addressed).
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void *__libc_mtag_new_tag (void*) */
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void *__libc_mtag_new_tag (void *);
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#endif /* USE_MTAG */
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#endif /* _AARCH64_LIBC_MTAG_H */
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