pro_epilogue_goto_start.c

  1// SPDX-License-Identifier: GPL-2.0
  2/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
  3
  4#include <vmlinux.h>
  5#include <bpf/bpf_tracing.h>
  6#include "bpf_misc.h"
  7#include "../test_kmods/bpf_testmod.h"
  8#include "../test_kmods/bpf_testmod_kfunc.h"
  9
 10char _license[] SEC("license") = "GPL";
 11
 12__success
 13/* prologue */
 14__xlated("0: r6 = *(u64 *)(r1 +0)")
 15__xlated("1: r7 = *(u64 *)(r6 +0)")
 16__xlated("2: r7 += 1000")
 17__xlated("3: *(u64 *)(r6 +0) = r7")
 18/* main prog */
 19__xlated("4: if r1 == 0x0 goto pc+5")
 20__xlated("5: if r1 == 0x1 goto pc+2")
 21__xlated("6: r1 = 1")
 22__xlated("7: goto pc-3")
 23__xlated("8: r1 = 0")
 24__xlated("9: goto pc-6")
 25__xlated("10: r0 = 0")
 26__xlated("11: exit")
 27SEC("struct_ops/test_prologue_goto_start")
 28__naked int test_prologue_goto_start(void)
 29{
 30	asm volatile (
 31	"if r1 == 0 goto +5;"
 32	"if r1 == 1 goto +2;"
 33	"r1 = 1;"
 34	"goto -3;"
 35	"r1 = 0;"
 36	"goto -6;"
 37	"r0 = 0;"
 38	"exit;"
 39	::: __clobber_all);
 40}
 41
 42__success
 43/* save __u64 *ctx to stack */
 44__xlated("0: *(u64 *)(r10 -8) = r1")
 45/* main prog */
 46__xlated("1: if r1 == 0x0 goto pc+5")
 47__xlated("2: if r1 == 0x1 goto pc+2")
 48__xlated("3: r1 = 1")
 49__xlated("4: goto pc-3")
 50__xlated("5: r1 = 0")
 51__xlated("6: goto pc-6")
 52__xlated("7: r0 = 0")
 53/* epilogue */
 54__xlated("8: r1 = *(u64 *)(r10 -8)")
 55__xlated("9: r1 = *(u64 *)(r1 +0)")
 56__xlated("10: r6 = *(u64 *)(r1 +0)")
 57__xlated("11: r6 += 10000")
 58__xlated("12: *(u64 *)(r1 +0) = r6")
 59__xlated("13: r0 = r6")
 60__xlated("14: r0 *= 2")
 61__xlated("15: exit")
 62SEC("struct_ops/test_epilogue_goto_start")
 63__naked int test_epilogue_goto_start(void)
 64{
 65	asm volatile (
 66	"if r1 == 0 goto +5;"
 67	"if r1 == 1 goto +2;"
 68	"r1 = 1;"
 69	"goto -3;"
 70	"r1 = 0;"
 71	"goto -6;"
 72	"r0 = 0;"
 73	"exit;"
 74	::: __clobber_all);
 75}
 76
 77__success
 78/* prologue */
 79__xlated("0: r6 = *(u64 *)(r1 +0)")
 80__xlated("1: r7 = *(u64 *)(r6 +0)")
 81__xlated("2: r7 += 1000")
 82__xlated("3: *(u64 *)(r6 +0) = r7")
 83/* save __u64 *ctx to stack */
 84__xlated("4: *(u64 *)(r10 -8) = r1")
 85/* main prog */
 86__xlated("5: if r1 == 0x0 goto pc+5")
 87__xlated("6: if r1 == 0x1 goto pc+2")
 88__xlated("7: r1 = 1")
 89__xlated("8: goto pc-3")
 90__xlated("9: r1 = 0")
 91__xlated("10: goto pc-6")
 92__xlated("11: r0 = 0")
 93/* epilogue */
 94__xlated("12: r1 = *(u64 *)(r10 -8)")
 95__xlated("13: r1 = *(u64 *)(r1 +0)")
 96__xlated("14: r6 = *(u64 *)(r1 +0)")
 97__xlated("15: r6 += 10000")
 98__xlated("16: *(u64 *)(r1 +0) = r6")
 99__xlated("17: r0 = r6")
100__xlated("18: r0 *= 2")
101__xlated("19: exit")
102SEC("struct_ops/test_pro_epilogue_goto_start")
103__naked int test_pro_epilogue_goto_start(void)
104{
105	asm volatile (
106	"if r1 == 0 goto +5;"
107	"if r1 == 1 goto +2;"
108	"r1 = 1;"
109	"goto -3;"
110	"r1 = 0;"
111	"goto -6;"
112	"r0 = 0;"
113	"exit;"
114	::: __clobber_all);
115}
116
117SEC(".struct_ops.link")
118struct bpf_testmod_st_ops epilogue_goto_start = {
119	.test_prologue = (void *)test_prologue_goto_start,
120	.test_epilogue = (void *)test_epilogue_goto_start,
121	.test_pro_epilogue = (void *)test_pro_epilogue_goto_start,
122};
123
124SEC("syscall")
125__retval(0)
126int syscall_prologue_goto_start(void *ctx)
127{
128	struct st_ops_args args = {};
129
130	return bpf_kfunc_st_ops_test_prologue(&args);
131}
132
133SEC("syscall")
134__retval(20000) /* (EPILOGUE_A [10000]) * 2 */
135int syscall_epilogue_goto_start(void *ctx)
136{
137	struct st_ops_args args = {};
138
139	return bpf_kfunc_st_ops_test_epilogue(&args);
140}
141
142SEC("syscall")
143__retval(22000) /* (PROLOGUE_A [1000] + EPILOGUE_A [10000]) * 2 */
144int syscall_pro_epilogue_goto_start(void *ctx)
145{
146	struct st_ops_args args = {};
147
148	return bpf_kfunc_st_ops_test_pro_epilogue(&args);
149}