tools/testing/selftests/bpf/progs/pro_epilogue_goto_start.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */

#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#include "../bpf_testmod/bpf_testmod.h"
#include "../bpf_testmod/bpf_testmod_kfunc.h"

char _license[] SEC("license") = "GPL";

__success
/* prologue */
__xlated("0: r6 = *(u64 *)(r1 +0)")
__xlated("1: r7 = *(u64 *)(r6 +0)")
__xlated("2: r7 += 1000")
__xlated("3: *(u64 *)(r6 +0) = r7")
/* main prog */
__xlated("4: if r1 == 0x0 goto pc+5")
__xlated("5: if r1 == 0x1 goto pc+2")
__xlated("6: r1 = 1")
__xlated("7: goto pc-3")
__xlated("8: r1 = 0")
__xlated("9: goto pc-6")
__xlated("10: r0 = 0")
__xlated("11: exit")
SEC("struct_ops/test_prologue_goto_start")
__naked int test_prologue_goto_start(void)
{
	asm volatile (
	"if r1 == 0 goto +5;"
	"if r1 == 1 goto +2;"
	"r1 = 1;"
	"goto -3;"
	"r1 = 0;"
	"goto -6;"
	"r0 = 0;"
	"exit;"
	::: __clobber_all);
}

__success
/* save __u64 *ctx to stack */
__xlated("0: *(u64 *)(r10 -8) = r1")
/* main prog */
__xlated("1: if r1 == 0x0 goto pc+5")
__xlated("2: if r1 == 0x1 goto pc+2")
__xlated("3: r1 = 1")
__xlated("4: goto pc-3")
__xlated("5: r1 = 0")
__xlated("6: goto pc-6")
__xlated("7: r0 = 0")
/* epilogue */
__xlated("8: r1 = *(u64 *)(r10 -8)")
__xlated("9: r1 = *(u64 *)(r1 +0)")
__xlated("10: r6 = *(u64 *)(r1 +0)")
__xlated("11: r6 += 10000")
__xlated("12: *(u64 *)(r1 +0) = r6")
__xlated("13: r0 = r6")
__xlated("14: r0 *= 2")
__xlated("15: exit")
SEC("struct_ops/test_epilogue_goto_start")
__naked int test_epilogue_goto_start(void)
{
	asm volatile (
	"if r1 == 0 goto +5;"
	"if r1 == 1 goto +2;"
	"r1 = 1;"
	"goto -3;"
	"r1 = 0;"
	"goto -6;"
	"r0 = 0;"
	"exit;"
	::: __clobber_all);
}

__success
/* prologue */
__xlated("0: r6 = *(u64 *)(r1 +0)")
__xlated("1: r7 = *(u64 *)(r6 +0)")
__xlated("2: r7 += 1000")
__xlated("3: *(u64 *)(r6 +0) = r7")
/* save __u64 *ctx to stack */
__xlated("4: *(u64 *)(r10 -8) = r1")
/* main prog */
__xlated("5: if r1 == 0x0 goto pc+5")
__xlated("6: if r1 == 0x1 goto pc+2")
__xlated("7: r1 = 1")
__xlated("8: goto pc-3")
__xlated("9: r1 = 0")
__xlated("10: goto pc-6")
__xlated("11: r0 = 0")
/* epilogue */
__xlated("12: r1 = *(u64 *)(r10 -8)")
__xlated("13: r1 = *(u64 *)(r1 +0)")
__xlated("14: r6 = *(u64 *)(r1 +0)")
__xlated("15: r6 += 10000")
__xlated("16: *(u64 *)(r1 +0) = r6")
__xlated("17: r0 = r6")
__xlated("18: r0 *= 2")
__xlated("19: exit")
SEC("struct_ops/test_pro_epilogue_goto_start")
__naked int test_pro_epilogue_goto_start(void)
{
	asm volatile (
	"if r1 == 0 goto +5;"
	"if r1 == 1 goto +2;"
	"r1 = 1;"
	"goto -3;"
	"r1 = 0;"
	"goto -6;"
	"r0 = 0;"
	"exit;"
	::: __clobber_all);
}

SEC(".struct_ops.link")
struct bpf_testmod_st_ops epilogue_goto_start = {
	.test_prologue = (void *)test_prologue_goto_start,
	.test_epilogue = (void *)test_epilogue_goto_start,
	.test_pro_epilogue = (void *)test_pro_epilogue_goto_start,
};

SEC("syscall")
__retval(0)
int syscall_prologue_goto_start(void *ctx)
{
	struct st_ops_args args = {};

	return bpf_kfunc_st_ops_test_prologue(&args);
}

SEC("syscall")
__retval(20000) /* (EPILOGUE_A [10000]) * 2 */
int syscall_epilogue_goto_start(void *ctx)
{
	struct st_ops_args args = {};

	return bpf_kfunc_st_ops_test_epilogue(&args);
}

SEC("syscall")
__retval(22000) /* (PROLOGUE_A [1000] + EPILOGUE_A [10000]) * 2 */
int syscall_pro_epilogue_goto_start(void *ctx)
{
	struct st_ops_args args = {};

	return bpf_kfunc_st_ops_test_pro_epilogue(&args);
}