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b811d2c2 | 1 | /* Copyright (C) 2009-2020 Free Software Foundation, Inc. |
2838cc1d SD |
2 | |
3 | This file is part of GDB. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
41977d16 | 18 | #include <assert.h> |
2838cc1d SD |
19 | #include <stdio.h> |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
23 | ||
24 | #include <sys/mman.h> | |
25 | ||
26 | #include JIT_READER_H /* Please see jit-reader.exp for an explanation. */ | |
922a7c7c | 27 | #include "jit-reader-host.h" |
2838cc1d SD |
28 | #include "jit-protocol.h" |
29 | ||
2838cc1d SD |
30 | struct jit_code_entry only_entry; |
31 | ||
d043f8c8 SM |
32 | typedef void (jit_function_stack_mangle_t) (void); |
33 | typedef long (jit_function_add_t) (long a, long b); | |
2838cc1d | 34 | |
20aa2c60 PA |
35 | /* The code of the jit_function_00 function that is copied into an |
36 | mmapped buffer in the inferior at run time. | |
37 | ||
38 | The second instruction mangles the stack pointer, meaning that when | |
39 | stopped at the third instruction, GDB needs assistance from the JIT | |
40 | unwinder in order to be able to unwind successfully. */ | |
d043f8c8 | 41 | static const unsigned char jit_function_stack_mangle_code[] = { |
20aa2c60 PA |
42 | 0xcc, /* int3 */ |
43 | 0x48, 0x83, 0xf4, 0xff, /* xor $0xffffffffffffffff, %rsp */ | |
44 | 0x48, 0x83, 0xf4, 0xff, /* xor $0xffffffffffffffff, %rsp */ | |
45 | 0xc3 /* ret */ | |
46 | }; | |
47 | ||
d043f8c8 SM |
48 | /* And another "JIT-ed" function, with the prototype `jit_function_add_t`. */ |
49 | static const unsigned char jit_function_add_code[] = { | |
50 | 0x48, 0x01, 0xfe, /* add %rdi,%rsi */ | |
51 | 0x48, 0x89, 0xf0, /* mov %rsi,%rax */ | |
52 | 0xc3, /* retq */ | |
53 | }; | |
54 | ||
20aa2c60 PA |
55 | int |
56 | main (int argc, char **argv) | |
2838cc1d | 57 | { |
d043f8c8 | 58 | struct jithost_abi *symfile = malloc (sizeof (struct jithost_abi)); |
2838cc1d SD |
59 | char *code = mmap (NULL, getpagesize (), PROT_WRITE | PROT_EXEC, |
60 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
d043f8c8 SM |
61 | char *code_end = code; |
62 | ||
41977d16 SM |
63 | assert (code != MAP_FAILED); |
64 | ||
d043f8c8 SM |
65 | /* "JIT" function_stack_mangle. */ |
66 | memcpy (code_end, jit_function_stack_mangle_code, | |
67 | sizeof (jit_function_stack_mangle_code)); | |
68 | jit_function_stack_mangle_t *function_stack_mangle | |
69 | = (jit_function_stack_mangle_t *) code_end; | |
70 | symfile->function_stack_mangle.begin = code_end; | |
71 | code_end += sizeof (jit_function_stack_mangle_code); | |
72 | symfile->function_stack_mangle.end = code_end; | |
73 | ||
74 | /* "JIT" function_add. */ | |
75 | memcpy (code_end, jit_function_add_code, sizeof (jit_function_add_code)); | |
76 | jit_function_add_t *function_add = (jit_function_add_t *) code_end; | |
77 | symfile->function_add.begin = code_end; | |
78 | code_end += sizeof (jit_function_add_code); | |
79 | symfile->function_add.end = code_end; | |
80 | ||
81 | /* Bounds of the whole object. */ | |
82 | symfile->object.begin = code; | |
83 | symfile->object.end = code_end; | |
2838cc1d SD |
84 | |
85 | only_entry.symfile_addr = symfile; | |
86 | only_entry.symfile_size = sizeof (struct jithost_abi); | |
87 | ||
88 | __jit_debug_descriptor.first_entry = &only_entry; | |
89 | __jit_debug_descriptor.relevant_entry = &only_entry; | |
90 | __jit_debug_descriptor.action_flag = JIT_REGISTER; | |
91 | __jit_debug_descriptor.version = 1; | |
92 | __jit_debug_register_code (); | |
93 | ||
d043f8c8 SM |
94 | function_stack_mangle (); |
95 | function_add (5, 6); | |
2838cc1d SD |
96 | |
97 | return 0; | |
98 | } |