mirror of
https://sourceware.org/git/binutils-gdb.git
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1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
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) 2015-2024 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 "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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