13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
* file.
*/
#include "config.h"
#include "platform.h"
.intel_syntax noprefix
.macro generate_lookup name not_found
\name:
test rdi, rdi
jz short ret_nil
bt edi, 0
jc short .Ltagged_pointer_\name
mov r8, [rdi]
mov r8, [r8+64]
.Lmain_\name:
mov rax, [rsi]
movzx ecx, ah
movzx edx, al
#ifdef OF_SELUID24
shr eax, 16
mov r8, [r8+rax*8]
#endif
mov r8, [r8+rcx*8]
mov rax, [r8+rdx*8]
test rax, rax
jz short \not_found@PLT
ret
.Ltagged_pointer_\name:
mov rax, [rip+objc_tagged_pointer_secret@GOTPCREL]
xor rdi, [rax]
and dil, 0xE
movzx r8, dil
mov rax, [rip+objc_tagged_pointer_classes@GOTPCREL]
mov r8, [rax+r8*4]
mov r8, [r8+64]
jmp short .Lmain_\name
.type \name, %function
.size \name, .-\name
.endm
.macro generate_lookup_super name lookup
\name:
mov r8, rdi
mov rdi, [rdi]
test rdi, rdi
jz short ret_nil
mov r8, [r8+8]
mov r8, [r8+64]
jmp short .Lmain_\lookup
.type \name, %function
.size \name, .-\name
.endm
generate_lookup objc_msg_lookup objc_method_not_found
generate_lookup objc_msg_lookup_stret objc_method_not_found_stret
generate_lookup_super objc_msg_lookup_super objc_msg_lookup
generate_lookup_super objc_msg_lookup_super_stret objc_msg_lookup_stret
ret_nil:
lea rax, [rip+nil_method]
ret
nil_method:
xor rax, rax
ret
#ifdef OF_LINUX
.section .note.GNU-stack, "", %progbits
#endif
|
<
<
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
>
|
|
|
<
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
* file.
*/
#include "config.h"
#include "platform.h"
.globl objc_msg_lookup
.globl objc_msg_lookup_stret
.globl objc_msg_lookup_super
.globl objc_msg_lookup_super_stret
.section .text
.macro GENERATE_LOOKUP name notFound
\name:
testq %rdi, %rdi
jz returnNilMethod
testb $1, %dil
jnz .LtaggedPointer_\name
movq (%rdi), %r8
movq 64(%r8), %r8
.Lmain_\name:
movq (%rsi), %rax
movzbl %ah, %ecx
movzbl %al, %edx
#ifdef OF_SELUID24
shrl $16, %eax
movq (%r8,%rax,8), %r8
#endif
movq (%r8,%rcx,8), %r8
movq (%r8,%rdx,8), %rax
testq %rax, %rax
jz \notFound@PLT
ret
.LtaggedPointer_\name:
movq objc_taggedPointerSecret@GOTPCREL(%rip), %rax
xorq (%rax), %rdi
andb $0xE, %dil
movzbl %dil, %r8d
movq objc_taggedPointerClasses@GOTPCREL(%rip), %rax
movq (%rax,%r8,4), %r8
movq 64(%r8), %r8
jmp .Lmain_\name
.type \name, %function
.size \name, .-\name
.endm
.macro GENERATE_LOOKUP_SUPER name lookup
\name:
movq %rdi, %r8
movq (%rdi), %rdi
testq %rdi, %rdi
jz returnNilMethod
movq 8(%r8), %r8
movq 64(%r8), %r8
jmp .Lmain_\lookup
.type \name, %function
.size \name, .-\name
.endm
GENERATE_LOOKUP objc_msg_lookup objc_methodNotFound
GENERATE_LOOKUP objc_msg_lookup_stret objc_methodNotFound_stret
GENERATE_LOOKUP_SUPER objc_msg_lookup_super objc_msg_lookup
GENERATE_LOOKUP_SUPER objc_msg_lookup_super_stret objc_msg_lookup_stret
returnNilMethod:
leaq nilMethod(%rip), %rax
ret
nilMethod:
xorq %rax, %rax
ret
#ifdef OF_LINUX
.section .note.GNU-stack, "", %progbits
#endif
|