mirror of https://github.com/torvalds/linux.git
128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include "../../../include/linux/filter.h"
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#include "bpf_misc.h"
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SEC("raw_tp")
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__description("may_goto 0")
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__arch_x86_64
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__xlated("0: r0 = 1")
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__xlated("1: exit")
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__success
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__naked void may_goto_simple(void)
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{
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asm volatile (
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".8byte %[may_goto];"
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"r0 = 1;"
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".8byte %[may_goto];"
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"exit;"
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:
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: __imm_insn(may_goto, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, 0 /* offset */, 0))
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: __clobber_all);
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}
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SEC("raw_tp")
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__description("batch 2 of may_goto 0")
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__arch_x86_64
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__xlated("0: r0 = 1")
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__xlated("1: exit")
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__success
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__naked void may_goto_batch_0(void)
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{
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asm volatile (
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".8byte %[may_goto1];"
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".8byte %[may_goto1];"
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"r0 = 1;"
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".8byte %[may_goto1];"
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".8byte %[may_goto1];"
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"exit;"
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:
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: __imm_insn(may_goto1, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, 0 /* offset */, 0))
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: __clobber_all);
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}
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SEC("raw_tp")
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__description("may_goto batch with offsets 2/1/0")
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__arch_x86_64
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__xlated("0: r0 = 1")
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__xlated("1: exit")
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__success
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__naked void may_goto_batch_1(void)
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{
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asm volatile (
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".8byte %[may_goto1];"
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".8byte %[may_goto2];"
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".8byte %[may_goto3];"
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"r0 = 1;"
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".8byte %[may_goto1];"
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".8byte %[may_goto2];"
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".8byte %[may_goto3];"
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"exit;"
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:
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: __imm_insn(may_goto1, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, 2 /* offset */, 0)),
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__imm_insn(may_goto2, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, 1 /* offset */, 0)),
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__imm_insn(may_goto3, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, 0 /* offset */, 0))
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: __clobber_all);
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}
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SEC("raw_tp")
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__description("may_goto batch with offsets 2/0 - x86_64")
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__arch_x86_64
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__xlated("0: *(u64 *)(r10 -16) = 65535")
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__xlated("1: *(u64 *)(r10 -8) = 0")
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__xlated("2: r11 = *(u64 *)(r10 -16)")
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__xlated("3: if r11 == 0x0 goto pc+6")
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__xlated("4: r11 -= 1")
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__xlated("5: if r11 != 0x0 goto pc+2")
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__xlated("6: r11 = -16")
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__xlated("7: call unknown")
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__xlated("8: *(u64 *)(r10 -16) = r11")
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__xlated("9: r0 = 1")
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__xlated("10: r0 = 2")
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__xlated("11: exit")
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__success
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__naked void may_goto_batch_2_x86_64(void)
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{
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asm volatile (
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".8byte %[may_goto1];"
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".8byte %[may_goto3];"
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"r0 = 1;"
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"r0 = 2;"
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"exit;"
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:
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: __imm_insn(may_goto1, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, 2 /* offset */, 0)),
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__imm_insn(may_goto3, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, 0 /* offset */, 0))
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: __clobber_all);
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}
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SEC("raw_tp")
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__description("may_goto batch with offsets 2/0 - arm64")
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__arch_arm64
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__xlated("0: *(u64 *)(r10 -8) = 8388608")
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__xlated("1: r11 = *(u64 *)(r10 -8)")
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__xlated("2: if r11 == 0x0 goto pc+3")
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__xlated("3: r11 -= 1")
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__xlated("4: *(u64 *)(r10 -8) = r11")
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__xlated("5: r0 = 1")
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__xlated("6: r0 = 2")
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__xlated("7: exit")
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__success
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__naked void may_goto_batch_2_arm64(void)
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{
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asm volatile (
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".8byte %[may_goto1];"
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".8byte %[may_goto3];"
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"r0 = 1;"
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"r0 = 2;"
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"exit;"
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:
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: __imm_insn(may_goto1, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, 2 /* offset */, 0)),
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__imm_insn(may_goto3, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, 0 /* offset */, 0))
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: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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