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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/net/bpf_timed_may_goto.S
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// SPDX-License-Identifier: GPL-2.0

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/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */

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#include <linux/export.h>

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#include <linux/linkage.h>

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#include <asm/nospec-branch.h>

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	.code64

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	.section .text, "ax"

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SYM_FUNC_START(arch_bpf_timed_may_goto)

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	ANNOTATE_NOENDBR

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	/*

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	 * r10 passes us stack depth, load the pointer to count and timestamp

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	 * into r10 by adding it to BPF frame pointer.

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	 */

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	leaq (%rbp, %r10, 1), %r10

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	/* Setup frame. */

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	pushq %rbp

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	movq %rsp, %rbp

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	/* Save r0-r5. */

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	pushq %rax

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	pushq %rdi

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	pushq %rsi

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	pushq %rdx

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	pushq %rcx

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	pushq %r8

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	/*

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	 * r10 has the pointer to count and timestamp, pass it as first

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	 * argument.

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	 */

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	movq %r10, %rdi

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	/* Emit call depth accounting for call below. */

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	CALL_DEPTH_ACCOUNT

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	call bpf_check_timed_may_goto

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	/* BPF_REG_AX=r10 will be stored into count, so move return value to it. */

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	movq %rax, %r10

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	/* Restore r5-r0. */

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	popq %r8

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	popq %rcx

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	popq %rdx

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	popq %rsi

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	popq %rdi

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	popq %rax

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	leave

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	RET

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SYM_FUNC_END(arch_bpf_timed_may_goto)

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