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https://github.com/bminor/binutils-gdb.git
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02b804035a
This commit adds new section - JIT Interface in Python - outlining how to use Python APIs introduced in previous commits to implement simple JIT interface. It also adds new test to make sure the example code is up-to-date. Reviewed-By: Eli Zaretskii <eliz@gnu.org>
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* Copyright (C) 2024-2024 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 <stdint.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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/* "JIT-ed" function, with the prototype `long (long, long)`. */
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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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/* Dummy function to inform the debugger a new code has been installed. */
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void jit_register_code (char * name, uintptr_t code, size_t size)
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{}
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/* Dummy function to inform the debugger that code has been installed. */
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void jit_unregister_code (uintptr_t code)
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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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void *code = mmap (NULL, getpagesize (), PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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assert (code != MAP_FAILED);
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/* "Compile" jit_function_add. */
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memcpy (code, jit_function_add_code,
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sizeof (jit_function_add_code));
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jit_register_code ("jit_function_add", (uintptr_t)code, sizeof (jit_function_add_code));
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((long (*)(long, long))code)(1,5); /* breakpoint 1 line */
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/* "Discard" jit_function_add. */
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memset(code, 0, sizeof(jit_function_add_code));
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jit_unregister_code ((uintptr_t)code);
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return 0; /* breakpoint 2 line */
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}
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