mirror of
https://github.com/bminor/binutils-gdb.git
synced 2025-12-12 10:32:50 +00:00
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.
99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
/* Copyright (C) 2009-2024 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 <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include JIT_READER_H /* Please see jit-reader.exp for an explanation. */
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#include "jit-reader-host.h"
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#include "jit-protocol.h"
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struct jit_code_entry only_entry;
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typedef void (jit_function_stack_mangle_t) (void);
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typedef long (jit_function_add_t) (long a, long b);
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/* The code of the jit_function_00 function that is copied into an
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mmapped buffer in the inferior at run time.
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The second instruction mangles the stack pointer, meaning that when
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stopped at the third instruction, GDB needs assistance from the JIT
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unwinder in order to be able to unwind successfully. */
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static const unsigned char jit_function_stack_mangle_code[] = {
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0xcc, /* int3 */
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0x48, 0x83, 0xf4, 0xff, /* xor $0xffffffffffffffff, %rsp */
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0x48, 0x83, 0xf4, 0xff, /* xor $0xffffffffffffffff, %rsp */
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0xc3 /* ret */
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};
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/* And another "JIT-ed" function, with the prototype `jit_function_add_t`. */
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static const unsigned char jit_function_add_code[] = {
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0x48, 0x01, 0xfe, /* add %rdi,%rsi */
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0x48, 0x89, 0xf0, /* mov %rsi,%rax */
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0xc3, /* retq */
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};
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int
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main (int argc, char **argv)
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{
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struct jithost_abi *symfile = malloc (sizeof (struct jithost_abi));
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char *code = mmap (NULL, getpagesize (), PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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char *code_end = code;
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assert (code != MAP_FAILED);
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/* "JIT" function_stack_mangle. */
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memcpy (code_end, jit_function_stack_mangle_code,
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sizeof (jit_function_stack_mangle_code));
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jit_function_stack_mangle_t *function_stack_mangle
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= (jit_function_stack_mangle_t *) code_end;
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symfile->function_stack_mangle.begin = code_end;
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code_end += sizeof (jit_function_stack_mangle_code);
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symfile->function_stack_mangle.end = code_end;
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/* "JIT" function_add. */
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memcpy (code_end, jit_function_add_code, sizeof (jit_function_add_code));
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jit_function_add_t *function_add = (jit_function_add_t *) code_end;
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symfile->function_add.begin = code_end;
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code_end += sizeof (jit_function_add_code);
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symfile->function_add.end = code_end;
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/* Bounds of the whole object. */
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symfile->object.begin = code;
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symfile->object.end = code_end;
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only_entry.symfile_addr = symfile;
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only_entry.symfile_size = sizeof (struct jithost_abi);
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__jit_debug_descriptor.first_entry = &only_entry;
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__jit_debug_descriptor.relevant_entry = &only_entry;
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__jit_debug_descriptor.action_flag = JIT_REGISTER;
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__jit_debug_descriptor.version = 1;
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__jit_debug_register_code ();
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function_stack_mangle ();
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function_add (5, 6);
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return 0;
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}
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