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https://sourceware.org/git/binutils-gdb.git
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fd67aa1129
Adds two new external authors to etc/update-copyright.py to cover bfd/ax_tls.m4, and adds gprofng to dirs handled automatically, then updates copyright messages as follows: 1) Update cgen/utils.scm emitted copyrights. 2) Run "etc/update-copyright.py --this-year" with an extra external author I haven't committed, 'Kalray SA.', to cover gas testsuite files (which should have their copyright message removed). 3) Build with --enable-maintainer-mode --enable-cgen-maint=yes. 4) Check out */po/*.pot which we don't update frequently.
313 lines
11 KiB
C
313 lines
11 KiB
C
/* bpf-dis.c - BPF disassembler.
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Copyright (C) 2023-2024 Free Software Foundation, Inc.
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Contributed by Oracle Inc.
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This file is part of the GNU binutils.
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This is free software; you can redistribute them and/or modify them
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but
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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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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; see the file COPYING3. If not,
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see <http://www.gnu.org/licenses/>. */
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#include "sysdep.h"
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#include "disassemble.h"
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#include "libiberty.h"
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#include "opintl.h"
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#include "opcode/bpf.h"
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#include "elf-bfd.h"
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#include "elf/bpf.h"
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#include <string.h>
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#include <inttypes.h>
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/* This disassembler supports two different syntaxes for BPF assembly.
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One is called "normal" and has the typical form for assembly
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languages, with mnemonics and the like. The other is called
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"pseudoc" and looks like C. */
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enum bpf_dialect
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{
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BPF_DIALECT_NORMAL,
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BPF_DIALECT_PSEUDOC
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};
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/* Global configuration for the disassembler. */
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static enum bpf_dialect asm_dialect = BPF_DIALECT_NORMAL;
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static int asm_bpf_version = -1;
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static int asm_obase = 10;
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/* Print BPF specific command-line options. */
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void
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print_bpf_disassembler_options (FILE *stream)
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{
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fprintf (stream, _("\n\
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The following BPF specific disassembler options are supported for use\n\
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with the -M switch (multiple options should be separated by commas):\n"));
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fprintf (stream, "\n");
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fprintf (stream, _("\
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pseudoc Use pseudo-c syntax.\n\
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v1,v2,v3,v4,xbpf Version of the BPF ISA to use.\n\
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hex,oct,dec Output numerical base for immediates.\n"));
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}
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/* Parse BPF specific command-line options. */
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static void
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parse_bpf_dis_option (const char *option)
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{
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if (strcmp (option, "pseudoc") == 0)
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asm_dialect = BPF_DIALECT_PSEUDOC;
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else if (strcmp (option, "v1") == 0)
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asm_bpf_version = BPF_V1;
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else if (strcmp (option, "v2") == 0)
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asm_bpf_version = BPF_V2;
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else if (strcmp (option, "v3") == 0)
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asm_bpf_version = BPF_V3;
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else if (strcmp (option, "v4") == 0)
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asm_bpf_version = BPF_V4;
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else if (strcmp (option, "xbpf") == 0)
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asm_bpf_version = BPF_XBPF;
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else if (strcmp (option, "hex") == 0)
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asm_obase = 16;
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else if (strcmp (option, "oct") == 0)
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asm_obase = 8;
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else if (strcmp (option, "dec") == 0)
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asm_obase = 10;
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else
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/* xgettext:c-format */
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opcodes_error_handler (_("unrecognized disassembler option: %s"), option);
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}
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static void
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parse_bpf_dis_options (const char *opts_in)
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{
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char *opts = xstrdup (opts_in), *opt = opts, *opt_end = opts;
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for ( ; opt_end != NULL; opt = opt_end + 1)
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{
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if ((opt_end = strchr (opt, ',')) != NULL)
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*opt_end = 0;
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parse_bpf_dis_option (opt);
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}
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free (opts);
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}
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/* Auxiliary function used in print_insn_bpf below. */
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static void
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print_register (disassemble_info *info,
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const char *tag, uint8_t regno)
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{
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const char *fmt
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= (asm_dialect == BPF_DIALECT_NORMAL
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? "%%r%d"
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: ((*(tag + 2) == 'w')
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? "w%d"
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: "r%d"));
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(*info->fprintf_styled_func) (info->stream, dis_style_register, fmt, regno);
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}
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/* Main entry point.
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Print one instruction from PC on INFO->STREAM.
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Return the size of the instruction (in bytes). */
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int
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print_insn_bpf (bfd_vma pc, disassemble_info *info)
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{
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int insn_size = 8, status;
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bfd_byte insn_bytes[16];
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bpf_insn_word word = 0;
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const struct bpf_opcode *insn = NULL;
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enum bpf_endian endian = (info->endian == BFD_ENDIAN_LITTLE
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? BPF_ENDIAN_LITTLE : BPF_ENDIAN_BIG);
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/* Handle bpf-specific command-line options. */
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if (info->disassembler_options != NULL)
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{
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parse_bpf_dis_options (info->disassembler_options);
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/* Avoid repeteadly parsing the options. */
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info->disassembler_options = NULL;
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}
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/* Determine what version of the BPF ISA to use when disassembling.
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If the user didn't explicitly specify an ISA version, then derive
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it from the CPU Version flag in the ELF header. A CPU version of
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0 in the header means "latest version". */
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if (asm_bpf_version == -1 && info->section && info->section->owner)
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{
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struct bfd *abfd = info->section->owner;
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Elf_Internal_Ehdr *header = elf_elfheader (abfd);
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int cpu_version = header->e_flags & EF_BPF_CPUVER;
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switch (cpu_version)
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{
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case 0: asm_bpf_version = BPF_V4; break;
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case 1: asm_bpf_version = BPF_V1; break;
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case 2: asm_bpf_version = BPF_V2; break;
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case 3: asm_bpf_version = BPF_V3; break;
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case 4: asm_bpf_version = BPF_V4; break;
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case 0xf: asm_bpf_version = BPF_XBPF; break;
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default:
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/* xgettext:c-format */
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opcodes_error_handler (_("unknown BPF CPU version %u\n"),
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cpu_version);
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break;
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}
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}
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/* Print eight bytes per line. */
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info->bytes_per_chunk = 1;
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info->bytes_per_line = 8;
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/* Read an instruction word. */
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status = (*info->read_memory_func) (pc, insn_bytes, 8, info);
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if (status != 0)
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{
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(*info->memory_error_func) (status, pc, info);
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return -1;
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}
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word = (bpf_insn_word) bfd_getb64 (insn_bytes);
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/* Try to match an instruction with it. */
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insn = bpf_match_insn (word, endian, asm_bpf_version);
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/* Print it out. */
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if (insn)
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{
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const char *insn_tmpl
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= asm_dialect == BPF_DIALECT_NORMAL ? insn->normal : insn->pseudoc;
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const char *p = insn_tmpl;
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/* Print the template contents completed with the instruction
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operands. */
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for (p = insn_tmpl; *p != '\0';)
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{
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switch (*p)
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{
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case ' ':
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/* Single space prints to nothing. */
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p += 1;
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break;
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case '%':
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if (*(p + 1) == '%')
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{
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(*info->fprintf_styled_func) (info->stream, dis_style_text, "%%");
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p += 2;
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}
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else if (*(p + 1) == 'w' || *(p + 1) == 'W')
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{
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/* %W prints to a single space. */
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(*info->fprintf_styled_func) (info->stream, dis_style_text, " ");
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p += 2;
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}
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else if (strncmp (p, "%dr", 3) == 0)
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{
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print_register (info, p, bpf_extract_dst (word, endian));
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p += 3;
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}
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else if (strncmp (p, "%sr", 3) == 0)
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{
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print_register (info, p, bpf_extract_src (word, endian));
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p += 3;
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}
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else if (strncmp (p, "%dw", 3) == 0)
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{
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print_register (info, p, bpf_extract_dst (word, endian));
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p += 3;
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}
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else if (strncmp (p, "%sw", 3) == 0)
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{
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print_register (info, p, bpf_extract_src (word, endian));
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p += 3;
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}
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else if (strncmp (p, "%i32", 4) == 0
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|| strncmp (p, "%d32", 4) == 0
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|| strncmp (p, "%I32", 4) == 0)
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{
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int32_t imm32 = bpf_extract_imm32 (word, endian);
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if (p[1] == 'I')
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(*info->fprintf_styled_func) (info->stream, dis_style_immediate,
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"%s",
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asm_obase != 10 || imm32 >= 0 ? "+" : "");
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(*info->fprintf_styled_func) (info->stream, dis_style_immediate,
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asm_obase == 10 ? "%" PRIi32
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: asm_obase == 8 ? "%" PRIo32
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: "0x%" PRIx32,
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imm32);
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p += 4;
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}
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else if (strncmp (p, "%o16", 4) == 0
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|| strncmp (p, "%d16", 4) == 0)
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{
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int16_t offset16 = bpf_extract_offset16 (word, endian);
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if (p[1] == 'o')
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(*info->fprintf_styled_func) (info->stream, dis_style_immediate,
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"%s",
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asm_obase != 10 || offset16 >= 0 ? "+" : "");
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if (asm_obase == 16 || asm_obase == 8)
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(*info->fprintf_styled_func) (info->stream, dis_style_immediate,
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asm_obase == 8 ? "0%" PRIo16 : "0x%" PRIx16,
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(uint16_t) offset16);
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else
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(*info->fprintf_styled_func) (info->stream, dis_style_immediate,
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"%" PRIi16, offset16);
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p += 4;
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}
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else if (strncmp (p, "%i64", 4) == 0)
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{
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bpf_insn_word word2 = 0;
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status = (*info->read_memory_func) (pc + 8, insn_bytes + 8,
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8, info);
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if (status != 0)
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{
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(*info->memory_error_func) (status, pc + 8, info);
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return -1;
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}
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word2 = (bpf_insn_word) bfd_getb64 (insn_bytes + 8);
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(*info->fprintf_styled_func) (info->stream, dis_style_immediate,
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asm_obase == 10 ? "%" PRIi64
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: asm_obase == 8 ? "0%" PRIo64
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: "0x%" PRIx64,
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bpf_extract_imm64 (word, word2, endian));
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insn_size = 16;
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p += 4;
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}
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else
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{
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/* xgettext:c-format */
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opcodes_error_handler (_("# internal error, unknown tag in opcode template (%s)"),
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insn_tmpl);
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return -1;
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}
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break;
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default:
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/* Any other character is printed literally. */
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(*info->fprintf_styled_func) (info->stream, dis_style_text, "%c", *p);
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p += 1;
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}
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}
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}
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else
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(*info->fprintf_styled_func) (info->stream, dis_style_text, "<unknown>");
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return insn_size;
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}
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