projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 7a12b503 DM |
2 | #include <asm/ptrace.h> |
| 3 | ||
| 4 | #include "bpf_jit_64.h" | |
| 5 | ||
| 6 | #define SAVE_SZ 176 | |
| 7 | #define SCRATCH_OFF STACK_BIAS + 128 | |
| 8 | #define BE_PTR(label) be,pn %xcc, label | |
| 9 | #define SIGN_EXTEND(reg) sra reg, 0, reg | |
| 10 | ||
| 11 | #define SKF_MAX_NEG_OFF (-0x200000) /* SKF_LL_OFF from filter.h */ | |
| 12 | ||
| 13 | .text | |
| 14 | .globl bpf_jit_load_word | |
| 15 | bpf_jit_load_word: | |
| 16 | cmp r_OFF, 0 | |
| 17 | bl bpf_slow_path_word_neg | |
| 18 | nop | |
| 19 | .globl bpf_jit_load_word_positive_offset | |
| 20 | bpf_jit_load_word_positive_offset: | |
| 21 | sub r_HEADLEN, r_OFF, r_TMP | |
| 22 | cmp r_TMP, 3 | |
| 23 | ble bpf_slow_path_word | |
| 24 | add r_SKB_DATA, r_OFF, r_TMP | |
| 25 | andcc r_TMP, 3, %g0 | |
| 26 | bne load_word_unaligned | |
| 27 | nop | |
| 28 | retl | |
| 29 | ld [r_TMP], r_RESULT | |
| 30 | load_word_unaligned: | |
| 31 | ldub [r_TMP + 0x0], r_OFF | |
| 32 | ldub [r_TMP + 0x1], r_TMP2 | |
| 33 | sll r_OFF, 8, r_OFF | |
| 34 | or r_OFF, r_TMP2, r_OFF | |
| 35 | ldub [r_TMP + 0x2], r_TMP2 | |
| 36 | sll r_OFF, 8, r_OFF | |
| 37 | or r_OFF, r_TMP2, r_OFF | |
| 38 | ldub [r_TMP + 0x3], r_TMP2 | |
| 39 | sll r_OFF, 8, r_OFF | |
| 40 | retl | |
| 41 | or r_OFF, r_TMP2, r_RESULT | |
| 42 | ||
| 43 | .globl bpf_jit_load_half | |
| 44 | bpf_jit_load_half: | |
| 45 | cmp r_OFF, 0 | |
| 46 | bl bpf_slow_path_half_neg | |
| 47 | nop | |
| 48 | .globl bpf_jit_load_half_positive_offset | |
| 49 | bpf_jit_load_half_positive_offset: | |
| 50 | sub r_HEADLEN, r_OFF, r_TMP | |
| 51 | cmp r_TMP, 1 | |
| 52 | ble bpf_slow_path_half | |
| 53 | add r_SKB_DATA, r_OFF, r_TMP | |
| 54 | andcc r_TMP, 1, %g0 | |
| 55 | bne load_half_unaligned | |
| 56 | nop | |
| 57 | retl | |
| 58 | lduh [r_TMP], r_RESULT | |
| 59 | load_half_unaligned: | |
| 60 | ldub [r_TMP + 0x0], r_OFF | |
| 61 | ldub [r_TMP + 0x1], r_TMP2 | |
| 62 | sll r_OFF, 8, r_OFF | |
| 63 | retl | |
| 64 | or r_OFF, r_TMP2, r_RESULT | |
| 65 | ||
| 66 | .globl bpf_jit_load_byte | |
| 67 | bpf_jit_load_byte: | |
| 68 | cmp r_OFF, 0 | |
| 69 | bl bpf_slow_path_byte_neg | |
| 70 | nop | |
| 71 | .globl bpf_jit_load_byte_positive_offset | |
| 72 | bpf_jit_load_byte_positive_offset: | |
| 73 | cmp r_OFF, r_HEADLEN | |
| 74 | bge bpf_slow_path_byte | |
| 75 | nop | |
| 76 | retl | |
| 77 | ldub [r_SKB_DATA + r_OFF], r_RESULT | |
| 78 | ||
| 79 | #define bpf_slow_path_common(LEN) \ | |
| 80 | save %sp, -SAVE_SZ, %sp; \ | |
| 81 | mov %i0, %o0; \ | |
| 82 | mov %i1, %o1; \ | |
| 83 | add %fp, SCRATCH_OFF, %o2; \ | |
| 84 | call skb_copy_bits; \ | |
| 85 | mov (LEN), %o3; \ | |
| 86 | cmp %o0, 0; \ | |
| 87 | restore; | |
| 88 | ||
| 89 | bpf_slow_path_word: | |
| 90 | bpf_slow_path_common(4) | |
| 91 | bl bpf_error | |
| 92 | ld [%sp + SCRATCH_OFF], r_RESULT | |
| 93 | retl | |
| 94 | nop | |
| 95 | bpf_slow_path_half: | |
| 96 | bpf_slow_path_common(2) | |
| 97 | bl bpf_error | |
| 98 | lduh [%sp + SCRATCH_OFF], r_RESULT | |
| 99 | retl | |
| 100 | nop | |
| 101 | bpf_slow_path_byte: | |
| 102 | bpf_slow_path_common(1) | |
| 103 | bl bpf_error | |
| 104 | ldub [%sp + SCRATCH_OFF], r_RESULT | |
| 105 | retl | |
| 106 | nop | |
| 107 | ||
| 108 | #define bpf_negative_common(LEN) \ | |
| 109 | save %sp, -SAVE_SZ, %sp; \ | |
| 110 | mov %i0, %o0; \ | |
| 111 | mov %i1, %o1; \ | |
| 112 | SIGN_EXTEND(%o1); \ | |
| 113 | call bpf_internal_load_pointer_neg_helper; \ | |
| 114 | mov (LEN), %o2; \ | |
| 115 | mov %o0, r_TMP; \ | |
| 116 | cmp %o0, 0; \ | |
| 117 | BE_PTR(bpf_error); \ | |
| 118 | restore; | |
| 119 | ||
| 120 | bpf_slow_path_word_neg: | |
| 121 | sethi %hi(SKF_MAX_NEG_OFF), r_TMP | |
| 122 | cmp r_OFF, r_TMP | |
| 123 | bl bpf_error | |
| 124 | nop | |
| 125 | .globl bpf_jit_load_word_negative_offset | |
| 126 | bpf_jit_load_word_negative_offset: | |
| 127 | bpf_negative_common(4) | |
| 128 | andcc r_TMP, 3, %g0 | |
| 129 | bne load_word_unaligned | |
| 130 | nop | |
| 131 | retl | |
| 132 | ld [r_TMP], r_RESULT | |
| 133 | ||
| 134 | bpf_slow_path_half_neg: | |
| 135 | sethi %hi(SKF_MAX_NEG_OFF), r_TMP | |
| 136 | cmp r_OFF, r_TMP | |
| 137 | bl bpf_error | |
| 138 | nop | |
| 139 | .globl bpf_jit_load_half_negative_offset | |
| 140 | bpf_jit_load_half_negative_offset: | |
| 141 | bpf_negative_common(2) | |
| 142 | andcc r_TMP, 1, %g0 | |
| 143 | bne load_half_unaligned | |
| 144 | nop | |
| 145 | retl | |
| 146 | lduh [r_TMP], r_RESULT | |
| 147 | ||
| 148 | bpf_slow_path_byte_neg: | |
| 149 | sethi %hi(SKF_MAX_NEG_OFF), r_TMP | |
| 150 | cmp r_OFF, r_TMP | |
| 151 | bl bpf_error | |
| 152 | nop | |
| 153 | .globl bpf_jit_load_byte_negative_offset | |
| 154 | bpf_jit_load_byte_negative_offset: | |
| 155 | bpf_negative_common(1) | |
| 156 | retl | |
| 157 | ldub [r_TMP], r_RESULT | |
| 158 | ||
| 159 | bpf_error: | |
| 160 | /* Make the JIT program itself return zero. */ | |
| 161 | ret | |
| 162 | restore %g0, %g0, %o0 |