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213516ef31
This commit is the result of running the gdb/copyright.py script, which automated the update of the copyright year range for all source files managed by the GDB project to be updated to include year 2023.
210 lines
5.0 KiB
C++
210 lines
5.0 KiB
C++
/* GNU/Linux/AArch64 specific low level interface, for the in-process
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agent library for GDB.
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Copyright (C) 2015-2023 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 "server.h"
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#include <sys/mman.h>
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#include "tracepoint.h"
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#include <elf.h>
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#ifdef HAVE_GETAUXVAL
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#include <sys/auxv.h>
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#endif
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#include "linux-aarch64-tdesc.h"
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/* Each register saved by the jump pad is in a 16 byte cell. */
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#define FT_CR_SIZE 16
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#define FT_CR_FPCR 0
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#define FT_CR_FPSR 1
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#define FT_CR_CPSR 2
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#define FT_CR_PC 3
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#define FT_CR_SP 4
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#define FT_CR_X0 5
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#define FT_CR_GPR(n) (FT_CR_X0 + (n))
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#define FT_CR_FPR(n) (FT_CR_GPR (31) + (n))
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/* Mapping between registers collected by the jump pad and GDB's register
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array layout used by regcache.
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See linux-aarch64-low.c (aarch64_install_fast_tracepoint_jump_pad) for
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more details. */
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static const int aarch64_ft_collect_regmap[] = {
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FT_CR_GPR (0),
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FT_CR_GPR (1),
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FT_CR_GPR (2),
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FT_CR_GPR (3),
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FT_CR_GPR (4),
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FT_CR_GPR (5),
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FT_CR_GPR (6),
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FT_CR_GPR (7),
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FT_CR_GPR (8),
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FT_CR_GPR (9),
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FT_CR_GPR (10),
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FT_CR_GPR (11),
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FT_CR_GPR (12),
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FT_CR_GPR (13),
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FT_CR_GPR (14),
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FT_CR_GPR (15),
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FT_CR_GPR (16),
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FT_CR_GPR (17),
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FT_CR_GPR (18),
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FT_CR_GPR (19),
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FT_CR_GPR (20),
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FT_CR_GPR (21),
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FT_CR_GPR (22),
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FT_CR_GPR (23),
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FT_CR_GPR (24),
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FT_CR_GPR (25),
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FT_CR_GPR (26),
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FT_CR_GPR (27),
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FT_CR_GPR (28),
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/* FP */
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FT_CR_GPR (29),
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/* LR */
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FT_CR_GPR (30),
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FT_CR_SP,
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FT_CR_PC,
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FT_CR_CPSR,
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FT_CR_FPR (0),
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FT_CR_FPR (1),
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FT_CR_FPR (2),
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FT_CR_FPR (3),
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FT_CR_FPR (4),
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FT_CR_FPR (5),
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FT_CR_FPR (6),
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FT_CR_FPR (7),
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FT_CR_FPR (8),
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FT_CR_FPR (9),
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FT_CR_FPR (10),
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FT_CR_FPR (11),
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FT_CR_FPR (12),
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FT_CR_FPR (13),
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FT_CR_FPR (14),
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FT_CR_FPR (15),
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FT_CR_FPR (16),
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FT_CR_FPR (17),
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FT_CR_FPR (18),
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FT_CR_FPR (19),
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FT_CR_FPR (20),
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FT_CR_FPR (21),
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FT_CR_FPR (22),
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FT_CR_FPR (23),
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FT_CR_FPR (24),
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FT_CR_FPR (25),
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FT_CR_FPR (26),
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FT_CR_FPR (27),
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FT_CR_FPR (28),
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FT_CR_FPR (29),
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FT_CR_FPR (30),
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FT_CR_FPR (31),
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FT_CR_FPSR,
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FT_CR_FPCR
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};
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#define AARCH64_NUM_FT_COLLECT_GREGS \
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(sizeof (aarch64_ft_collect_regmap) / sizeof(aarch64_ft_collect_regmap[0]))
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/* Fill in REGCACHE with registers saved by the jump pad in BUF. */
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void
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supply_fast_tracepoint_registers (struct regcache *regcache,
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const unsigned char *buf)
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{
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int i;
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for (i = 0; i < AARCH64_NUM_FT_COLLECT_GREGS; i++)
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supply_register (regcache, i,
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((char *) buf)
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+ (aarch64_ft_collect_regmap[i] * FT_CR_SIZE));
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}
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ULONGEST
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get_raw_reg (const unsigned char *raw_regs, int regnum)
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{
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if (regnum >= AARCH64_NUM_FT_COLLECT_GREGS)
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return 0;
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return *(ULONGEST *) (raw_regs
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+ aarch64_ft_collect_regmap[regnum] * FT_CR_SIZE);
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}
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/* Return target_desc to use for IPA, given the tdesc index passed by
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gdbserver. Index is ignored, since we have only one tdesc
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at the moment. SVE, pauth, MTE and TLS not yet supported. */
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const struct target_desc *
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get_ipa_tdesc (int idx)
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{
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return aarch64_linux_read_description ({});
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}
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/* Allocate buffer for the jump pads. The branch instruction has a reach
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of +/- 128MiB, and the executable is loaded at 0x400000 (4MiB).
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To maximize the area of executable that can use tracepoints, try
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allocating at 0x400000 - size initially, decreasing until we hit
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a free area. */
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void *
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alloc_jump_pad_buffer (size_t size)
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{
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uintptr_t addr;
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uintptr_t exec_base = getauxval (AT_PHDR);
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int pagesize;
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void *res;
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if (exec_base == 0)
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exec_base = 0x400000;
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pagesize = sysconf (_SC_PAGE_SIZE);
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if (pagesize == -1)
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perror_with_name ("sysconf");
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addr = exec_base - size;
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/* size should already be page-aligned, but this can't hurt. */
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addr &= ~(pagesize - 1);
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/* Search for a free area. If we hit 0, we're out of luck. */
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for (; addr; addr -= pagesize)
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{
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/* No MAP_FIXED - we don't want to zap someone's mapping. */
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res = mmap ((void *) addr, size,
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PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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/* If we got what we wanted, return. */
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if ((uintptr_t) res == addr)
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return res;
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/* If we got a mapping, but at a wrong address, undo it. */
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if (res != MAP_FAILED)
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munmap (res, size);
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}
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return NULL;
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}
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void
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initialize_low_tracepoint (void)
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{
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/* SVE, pauth, MTE and TLS not yet supported. */
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aarch64_linux_read_description ({});
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}
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