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The M7 processor supports an Application Data Integrity (ADI) feature that detects invalid data accesses. When software allocates data, it chooses a 4-bit version number, sets the version in the upper 4 bits of the 64-bit pointer to that data, and stores the 4-bit version in every cacheline of the object. Hardware saves the latter in spare bits in the cache and memory hierarchy. On each load and store, the processor compares the upper 4 VA (virtual address) bits to the cacheline's version. If there is a mismatch, the processor generates a version mismatch trap which can be either precise or disrupting. The trap is an error condition which the kernel delivers to the process as a SIGSEGV signal. The upper 4 bits of the VA represent a version and are not part of the true address. The processor clears these bits and sign extends bit 59 to generate the true address. Note that 32-bit applications cannot use ADI. This patch adds ADI support in gdb which allows the user to examine current version tags and assign new version tags in the program. It also catches and reports precise or disrupting memory corruption traps. gdb/ChangeLog: 2017-08-07 Weimin Pan <weimin.pan@oracle.com> * sparc64-tdep.h: (adi_normalize_address): New export. * sparc-nat.h: (open_adi_tag_fd): New export. * sparc64-linux-nat.c: (open_adi_tag_fd): New function. * sparc64-linux-tdep.c: (SEGV_ACCADI, SEGV_ADIDERR, SEGV_ADIPERR) New defines. (sparc64_linux_handle_segmentation_fault): New function. (sparc64_linux_init_abi): Register sparc64_linux_handle_segmentation_fault * sparc64-tdep.c: Include cli-utils.h,gdbcmd.h,auxv.h. (sparc64_addr_bits_remove): New function. (sparc64_init_abi): Register sparc64_addr_bits_remove. (MAX_PROC_NAME_SIZE): New macro. (AT_ADI_BLKSZ, AT_ADI_NBITS, AT_ADI_UEONADI) New defines. (sparc64adilist): New variable. (adi_proc_list): New variable. (find_adi_info): New function. (add_adi_info): New function. (get_adi_info_proc): New function. (get_adi_info): New function. (info_adi_command): New function. (read_maps_entry): New function. (adi_available): New function. (adi_normalize_address): New function. (adi_align_address): New function. (adi_convert_byte_count): New function. (adi_tag_fd): New function. (adi_is_addr_mapped): New function. (adi_read_versions): New function. (adi_write_versions): New function. (adi_print_versions): New function. (do_examine): New function. (do_assign): New function. (adi_examine_command): New function. (adi_assign_command): New function. (_initialize_sparc64_adi_tdep): New function. gdb/doc/ChangeLog: 2017-08-07 Weimin Pan <weimin.pan@oracle.com> * gdb.texinfo (Architectures): Add new Sparc64 section to document ADI support. * NEWS: Add "adi examine" and "adi assign" commands. gdb/testsuite/ChangeLog: 2017-08-07 Weimin Pan <weimin.pan@oracle.com> * gdb.arch/sparc64-adi.exp: New file. * gdb.arch/sparc64-adi.c: New file.
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/* Native-dependent code for GNU/Linux UltraSPARC.
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Copyright (C) 2003-2017 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 "defs.h"
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#include "regcache.h"
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#include <sys/procfs.h>
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#include "gregset.h"
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#include "sparc64-tdep.h"
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#include "sparc-tdep.h"
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#include "sparc-nat.h"
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#include "inferior.h"
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#include "target.h"
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#include "linux-nat.h"
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static const struct sparc_gregmap sparc64_linux_ptrace_gregmap =
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{
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16 * 8, /* "tstate" */
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17 * 8, /* %pc */
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18 * 8, /* %npc */
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19 * 8, /* %y */
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-1, /* %wim */
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-1, /* %tbr */
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0 * 8, /* %g1 */
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-1, /* %l0 */
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4 /* sizeof (%y) */
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};
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void
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supply_gregset (struct regcache *regcache, const prgregset_t *gregs)
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{
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sparc64_supply_gregset (sparc_gregmap, regcache, -1, gregs);
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}
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void
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supply_fpregset (struct regcache *regcache, const prfpregset_t *fpregs)
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{
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sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, -1, fpregs);
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}
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void
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fill_gregset (const struct regcache *regcache, prgregset_t *gregs, int regnum)
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{
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sparc64_collect_gregset (sparc_gregmap, regcache, regnum, gregs);
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}
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void
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fill_fpregset (const struct regcache *regcache,
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prfpregset_t *fpregs, int regnum)
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{
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sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_sparc64_linux_nat (void);
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void
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_initialize_sparc64_linux_nat (void)
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{
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struct target_ops *t;
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/* Fill in the generic GNU/Linux methods. */
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t = linux_target ();
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sparc_fpregmap = &sparc64_bsd_fpregmap;
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/* Add our register access methods. */
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t->to_fetch_registers = sparc_fetch_inferior_registers;
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t->to_store_registers = sparc_store_inferior_registers;
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/* Register the target. */
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linux_nat_add_target (t);
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/* ADI support */
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linux_nat_set_forget_process (t, sparc64_forget_process);
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sparc_gregmap = &sparc64_linux_ptrace_gregmap;
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}
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