256eab48e7
In preparation of skipping emitting static variables in BPF skeletons, switch all current selftests uses of static variables to pass data between BPF and user-space to use global variables. All non-read-only `static volatile` variables become just plain global variables by dropping `static volatile` part. Read-only `static volatile const` variables, though, still require `volatile` modifier, otherwise compiler will ignore whatever values are set from user-space. Few static linker tests are using name-conflicting static variables to validate that static linker still properly handles static variables and doesn't trip up on name conflicts. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210507054119.270888-4-andrii@kernel.org
60 lines
973 B
C
60 lines
973 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2019 Facebook */
|
|
|
|
#include <stdbool.h>
|
|
#include <linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
|
|
struct s {
|
|
int a;
|
|
long long b;
|
|
} __attribute__((packed));
|
|
|
|
/* .data section */
|
|
int in1 = -1;
|
|
long long in2 = -1;
|
|
|
|
/* .bss section */
|
|
char in3 = '\0';
|
|
long long in4 __attribute__((aligned(64))) = 0;
|
|
struct s in5 = {};
|
|
|
|
/* .rodata section */
|
|
const volatile struct {
|
|
const int in6;
|
|
} in = {};
|
|
|
|
/* .data section */
|
|
int out1 = -1;
|
|
long long out2 = -1;
|
|
|
|
/* .bss section */
|
|
char out3 = 0;
|
|
long long out4 = 0;
|
|
int out6 = 0;
|
|
|
|
extern bool CONFIG_BPF_SYSCALL __kconfig;
|
|
extern int LINUX_KERNEL_VERSION __kconfig;
|
|
bool bpf_syscall = 0;
|
|
int kern_ver = 0;
|
|
|
|
struct s out5 = {};
|
|
|
|
SEC("raw_tp/sys_enter")
|
|
int handler(const void *ctx)
|
|
{
|
|
out1 = in1;
|
|
out2 = in2;
|
|
out3 = in3;
|
|
out4 = in4;
|
|
out5 = in5;
|
|
out6 = in.in6;
|
|
|
|
bpf_syscall = CONFIG_BPF_SYSCALL;
|
|
kern_ver = LINUX_KERNEL_VERSION;
|
|
|
|
return 0;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|