1
2
3
4
5
6
7
8
9
10
11
12
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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
| /* SPDX-License-Identifier: GPL-2.0 */
| #include <asm/ptrace.h>
|
| #include "bpf_jit_32.h"
|
| #define SAVE_SZ 96
| #define SCRATCH_OFF 72
| #define BE_PTR(label) be label
| #define SIGN_EXTEND(reg)
|
| #define SKF_MAX_NEG_OFF (-0x200000) /* SKF_LL_OFF from filter.h */
|
| .text
| .globl bpf_jit_load_word
| bpf_jit_load_word:
| cmp r_OFF, 0
| bl bpf_slow_path_word_neg
| nop
| .globl bpf_jit_load_word_positive_offset
| bpf_jit_load_word_positive_offset:
| sub r_HEADLEN, r_OFF, r_TMP
| cmp r_TMP, 3
| ble bpf_slow_path_word
| add r_SKB_DATA, r_OFF, r_TMP
| andcc r_TMP, 3, %g0
| bne load_word_unaligned
| nop
| retl
| ld [r_TMP], r_A
| load_word_unaligned:
| ldub [r_TMP + 0x0], r_OFF
| ldub [r_TMP + 0x1], r_TMP2
| sll r_OFF, 8, r_OFF
| or r_OFF, r_TMP2, r_OFF
| ldub [r_TMP + 0x2], r_TMP2
| sll r_OFF, 8, r_OFF
| or r_OFF, r_TMP2, r_OFF
| ldub [r_TMP + 0x3], r_TMP2
| sll r_OFF, 8, r_OFF
| retl
| or r_OFF, r_TMP2, r_A
|
| .globl bpf_jit_load_half
| bpf_jit_load_half:
| cmp r_OFF, 0
| bl bpf_slow_path_half_neg
| nop
| .globl bpf_jit_load_half_positive_offset
| bpf_jit_load_half_positive_offset:
| sub r_HEADLEN, r_OFF, r_TMP
| cmp r_TMP, 1
| ble bpf_slow_path_half
| add r_SKB_DATA, r_OFF, r_TMP
| andcc r_TMP, 1, %g0
| bne load_half_unaligned
| nop
| retl
| lduh [r_TMP], r_A
| load_half_unaligned:
| ldub [r_TMP + 0x0], r_OFF
| ldub [r_TMP + 0x1], r_TMP2
| sll r_OFF, 8, r_OFF
| retl
| or r_OFF, r_TMP2, r_A
|
| .globl bpf_jit_load_byte
| bpf_jit_load_byte:
| cmp r_OFF, 0
| bl bpf_slow_path_byte_neg
| nop
| .globl bpf_jit_load_byte_positive_offset
| bpf_jit_load_byte_positive_offset:
| cmp r_OFF, r_HEADLEN
| bge bpf_slow_path_byte
| nop
| retl
| ldub [r_SKB_DATA + r_OFF], r_A
|
| .globl bpf_jit_load_byte_msh
| bpf_jit_load_byte_msh:
| cmp r_OFF, 0
| bl bpf_slow_path_byte_msh_neg
| nop
| .globl bpf_jit_load_byte_msh_positive_offset
| bpf_jit_load_byte_msh_positive_offset:
| cmp r_OFF, r_HEADLEN
| bge bpf_slow_path_byte_msh
| nop
| ldub [r_SKB_DATA + r_OFF], r_OFF
| and r_OFF, 0xf, r_OFF
| retl
| sll r_OFF, 2, r_X
|
| #define bpf_slow_path_common(LEN) \
| save %sp, -SAVE_SZ, %sp; \
| mov %i0, %o0; \
| mov r_OFF, %o1; \
| add %fp, SCRATCH_OFF, %o2; \
| call skb_copy_bits; \
| mov (LEN), %o3; \
| cmp %o0, 0; \
| restore;
|
| bpf_slow_path_word:
| bpf_slow_path_common(4)
| bl bpf_error
| ld [%sp + SCRATCH_OFF], r_A
| retl
| nop
| bpf_slow_path_half:
| bpf_slow_path_common(2)
| bl bpf_error
| lduh [%sp + SCRATCH_OFF], r_A
| retl
| nop
| bpf_slow_path_byte:
| bpf_slow_path_common(1)
| bl bpf_error
| ldub [%sp + SCRATCH_OFF], r_A
| retl
| nop
| bpf_slow_path_byte_msh:
| bpf_slow_path_common(1)
| bl bpf_error
| ldub [%sp + SCRATCH_OFF], r_A
| and r_OFF, 0xf, r_OFF
| retl
| sll r_OFF, 2, r_X
|
| #define bpf_negative_common(LEN) \
| save %sp, -SAVE_SZ, %sp; \
| mov %i0, %o0; \
| mov r_OFF, %o1; \
| SIGN_EXTEND(%o1); \
| call bpf_internal_load_pointer_neg_helper; \
| mov (LEN), %o2; \
| mov %o0, r_TMP; \
| cmp %o0, 0; \
| BE_PTR(bpf_error); \
| restore;
|
| bpf_slow_path_word_neg:
| sethi %hi(SKF_MAX_NEG_OFF), r_TMP
| cmp r_OFF, r_TMP
| bl bpf_error
| nop
| .globl bpf_jit_load_word_negative_offset
| bpf_jit_load_word_negative_offset:
| bpf_negative_common(4)
| andcc r_TMP, 3, %g0
| bne load_word_unaligned
| nop
| retl
| ld [r_TMP], r_A
|
| bpf_slow_path_half_neg:
| sethi %hi(SKF_MAX_NEG_OFF), r_TMP
| cmp r_OFF, r_TMP
| bl bpf_error
| nop
| .globl bpf_jit_load_half_negative_offset
| bpf_jit_load_half_negative_offset:
| bpf_negative_common(2)
| andcc r_TMP, 1, %g0
| bne load_half_unaligned
| nop
| retl
| lduh [r_TMP], r_A
|
| bpf_slow_path_byte_neg:
| sethi %hi(SKF_MAX_NEG_OFF), r_TMP
| cmp r_OFF, r_TMP
| bl bpf_error
| nop
| .globl bpf_jit_load_byte_negative_offset
| bpf_jit_load_byte_negative_offset:
| bpf_negative_common(1)
| retl
| ldub [r_TMP], r_A
|
| bpf_slow_path_byte_msh_neg:
| sethi %hi(SKF_MAX_NEG_OFF), r_TMP
| cmp r_OFF, r_TMP
| bl bpf_error
| nop
| .globl bpf_jit_load_byte_msh_negative_offset
| bpf_jit_load_byte_msh_negative_offset:
| bpf_negative_common(1)
| ldub [r_TMP], r_OFF
| and r_OFF, 0xf, r_OFF
| retl
| sll r_OFF, 2, r_X
|
| bpf_error:
| /* Make the JIT program return zero. The JIT epilogue
| * stores away the original %o7 into r_saved_O7. The
| * normal leaf function return is to use "retl" which
| * would evalute to "jmpl %o7 + 8, %g0" but we want to
| * use the saved value thus the sequence you see here.
| */
| jmpl r_saved_O7 + 8, %g0
| clr %o0
|
|
