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/* This test program is part of GDB, the GNU debugger.
Copyright 2011-2021 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Simulate loading of JIT code. */
#include <elf.h>
#include <link.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include "jit-protocol.h"
#include "jit-elf-util.h"
static void
usage (void)
{
fprintf (stderr, "Usage: jit-elf-main libraries...\n");
exit (1);
}
/* Defined by the .exp file if testing attach. */
#ifndef ATTACH
#define ATTACH 0
#endif
#ifndef MAIN
#define MAIN main
#endif
/* Must be defined by .exp file when compiling to know
what address to map the ELF binary to. */
#ifndef LOAD_ADDRESS
#error "Must define LOAD_ADDRESS"
#endif
#ifndef LOAD_INCREMENT
#error "Must define LOAD_INCREMENT"
#endif
/* Used to spin waiting for GDB. */
volatile int wait_for_gdb = ATTACH;
#define WAIT_FOR_GDB do {} while (wait_for_gdb)
/* The current process's PID. GDB retrieves this. */
int mypid;
int
MAIN (int argc, char *argv[])
{
int i;
alarm (300);
/* Used as backing storage for GDB to populate argv. */
char *fake_argv[10];
mypid = getpid ();
/* gdb break here 0 */
if (argc < 2)
{
usage ();
exit (1);
}
for (i = 1; i < argc; ++i)
{
size_t obj_size;
void *load_addr = (void *) (size_t) (LOAD_ADDRESS + (i - 1) * LOAD_INCREMENT);
printf ("Loading %s as JIT at %p\n", argv[i], load_addr);
void *addr = load_elf (argv[i], &obj_size, load_addr);
char name[32];
sprintf (name, "jit_function_%04d", i);
int (*jit_function) (void) = (int (*) (void)) load_symbol (addr, name);
/* Link entry at the end of the list. */
struct jit_code_entry *const entry = calloc (1, sizeof (*entry));
entry->symfile_addr = (const char *)addr;
entry->symfile_size = obj_size;
entry->prev_entry = __jit_debug_descriptor.relevant_entry;
__jit_debug_descriptor.relevant_entry = entry;
if (entry->prev_entry != NULL)
entry->prev_entry->next_entry = entry;
else
__jit_debug_descriptor.first_entry = entry;
/* Notify GDB. */
__jit_debug_descriptor.action_flag = JIT_REGISTER;
__jit_debug_register_code ();
if (jit_function () != 42)
{
fprintf (stderr, "unexpected return value\n");
exit (1);
}
}
WAIT_FOR_GDB; i = 0; /* gdb break here 1 */
/* Now unregister them all in reverse order. */
while (__jit_debug_descriptor.relevant_entry != NULL)
{
struct jit_code_entry *const entry =
__jit_debug_descriptor.relevant_entry;
struct jit_code_entry *const prev_entry = entry->prev_entry;
if (prev_entry != NULL)
{
prev_entry->next_entry = NULL;
entry->prev_entry = NULL;
}
else
__jit_debug_descriptor.first_entry = NULL;
/* Notify GDB. */
__jit_debug_descriptor.action_flag = JIT_UNREGISTER;
__jit_debug_register_code ();
__jit_debug_descriptor.relevant_entry = prev_entry;
free (entry);
}
WAIT_FOR_GDB; return 0; /* gdb break here 2 */
}
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