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d6212d82bf
The selftests build four kernel modules which use copy-pasted Makefile targets. This is a bit messy, and doesn't scale so well when we add more modules, so let's consolidate these rules into a single rule generated for each module name, and move the module sources into a single directory. To avoid parallel builds of the different modules stepping on each other's toes during the 'modpost' phase of the Kbuild 'make modules', the module files should really be a grouped target. However, make only added explicit support for grouped targets in version 4.3, which is newer than the minimum version supported by the kernel. However, make implicitly treats pattern matching rules with multiple targets as a grouped target, so we can work around this by turning the rule into a pattern matching target. We do this by replacing '.ko' with '%ko' in the targets with subst(). Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Viktor Malik <vmalik@redhat.com> Link: https://lore.kernel.org/bpf/20241204-bpf-selftests-mod-compile-v5-1-b96231134a49@redhat.com
154 lines
3.5 KiB
C
154 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
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#include <vmlinux.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_misc.h"
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#include "../test_kmods/bpf_testmod.h"
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#include "../test_kmods/bpf_testmod_kfunc.h"
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char _license[] SEC("license") = "GPL";
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void __kfunc_btf_root(void)
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{
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bpf_kfunc_st_ops_inc10(NULL);
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}
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static __noinline __used int subprog(struct st_ops_args *args)
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{
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args->a += 1;
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return args->a;
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}
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__success
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/* prologue */
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__xlated("0: r6 = *(u64 *)(r1 +0)")
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__xlated("1: r7 = *(u64 *)(r6 +0)")
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__xlated("2: r7 += 1000")
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__xlated("3: *(u64 *)(r6 +0) = r7")
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/* main prog */
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__xlated("4: r1 = *(u64 *)(r1 +0)")
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__xlated("5: r6 = r1")
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__xlated("6: call kernel-function")
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__xlated("7: r1 = r6")
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__xlated("8: call pc+1")
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__xlated("9: exit")
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SEC("struct_ops/test_prologue")
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__naked int test_prologue(void)
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{
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asm volatile (
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"r1 = *(u64 *)(r1 +0);"
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"r6 = r1;"
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"call %[bpf_kfunc_st_ops_inc10];"
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"r1 = r6;"
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"call subprog;"
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"exit;"
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:
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: __imm(bpf_kfunc_st_ops_inc10)
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: __clobber_all);
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}
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__success
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/* save __u64 *ctx to stack */
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__xlated("0: *(u64 *)(r10 -8) = r1")
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/* main prog */
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__xlated("1: r1 = *(u64 *)(r1 +0)")
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__xlated("2: r6 = r1")
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__xlated("3: call kernel-function")
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__xlated("4: r1 = r6")
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__xlated("5: call pc+")
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/* epilogue */
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__xlated("6: r1 = *(u64 *)(r10 -8)")
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__xlated("7: r1 = *(u64 *)(r1 +0)")
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__xlated("8: r6 = *(u64 *)(r1 +0)")
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__xlated("9: r6 += 10000")
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__xlated("10: *(u64 *)(r1 +0) = r6")
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__xlated("11: r0 = r6")
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__xlated("12: r0 *= 2")
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__xlated("13: exit")
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SEC("struct_ops/test_epilogue")
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__naked int test_epilogue(void)
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{
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asm volatile (
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"r1 = *(u64 *)(r1 +0);"
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"r6 = r1;"
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"call %[bpf_kfunc_st_ops_inc10];"
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"r1 = r6;"
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"call subprog;"
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"exit;"
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:
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: __imm(bpf_kfunc_st_ops_inc10)
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: __clobber_all);
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}
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__success
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/* prologue */
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__xlated("0: r6 = *(u64 *)(r1 +0)")
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__xlated("1: r7 = *(u64 *)(r6 +0)")
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__xlated("2: r7 += 1000")
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__xlated("3: *(u64 *)(r6 +0) = r7")
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/* save __u64 *ctx to stack */
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__xlated("4: *(u64 *)(r10 -8) = r1")
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/* main prog */
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__xlated("5: r1 = *(u64 *)(r1 +0)")
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__xlated("6: r6 = r1")
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__xlated("7: call kernel-function")
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__xlated("8: r1 = r6")
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__xlated("9: call pc+")
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/* epilogue */
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__xlated("10: r1 = *(u64 *)(r10 -8)")
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__xlated("11: r1 = *(u64 *)(r1 +0)")
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__xlated("12: r6 = *(u64 *)(r1 +0)")
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__xlated("13: r6 += 10000")
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__xlated("14: *(u64 *)(r1 +0) = r6")
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__xlated("15: r0 = r6")
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__xlated("16: r0 *= 2")
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__xlated("17: exit")
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SEC("struct_ops/test_pro_epilogue")
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__naked int test_pro_epilogue(void)
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{
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asm volatile (
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"r1 = *(u64 *)(r1 +0);"
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"r6 = r1;"
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"call %[bpf_kfunc_st_ops_inc10];"
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"r1 = r6;"
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"call subprog;"
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"exit;"
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:
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: __imm(bpf_kfunc_st_ops_inc10)
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: __clobber_all);
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}
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SEC("syscall")
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__retval(1011) /* PROLOGUE_A [1000] + KFUNC_INC10 + SUBPROG_A [1] */
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int syscall_prologue(void *ctx)
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{
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struct st_ops_args args = {};
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return bpf_kfunc_st_ops_test_prologue(&args);
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}
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SEC("syscall")
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__retval(20022) /* (KFUNC_INC10 + SUBPROG_A [1] + EPILOGUE_A [10000]) * 2 */
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int syscall_epilogue(void *ctx)
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{
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struct st_ops_args args = {};
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return bpf_kfunc_st_ops_test_epilogue(&args);
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}
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SEC("syscall")
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__retval(22022) /* (PROLOGUE_A [1000] + KFUNC_INC10 + SUBPROG_A [1] + EPILOGUE_A [10000]) * 2 */
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int syscall_pro_epilogue(void *ctx)
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{
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struct st_ops_args args = {};
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return bpf_kfunc_st_ops_test_pro_epilogue(&args);
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}
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SEC(".struct_ops.link")
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struct bpf_testmod_st_ops pro_epilogue = {
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.test_prologue = (void *)test_prologue,
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.test_epilogue = (void *)test_epilogue,
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.test_pro_epilogue = (void *)test_pro_epilogue,
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};
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