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// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "../test_kmods/bpf_testmod.h"
#include "bpf_misc.h"
char _license[] SEC("license") = "GPL";
void bpf_testmod_ops3_call_test_2(void) __ksym;
int val_i, val_j;
__noinline static int subprog2(int *a, int *b)
{
return val_i + a[10] + b[20];
}
__noinline static int subprog1(int *a)
{
/* stack size 200 bytes */
int b[50] = {};
b[20] = 2;
return subprog2(a, b);
}
/*
* A chain of 480-byte frames under test_2, so that its call chain exceeds
* the 2 KiB budget of JITs with large stacks as well as the 512 bytes
* allowed elsewhere. The compiler caps a single function at 512 bytes, and
* the buffers are volatile so that it cannot shrink them.
*/
__noinline static int subprog_deep4(int *a)
{
volatile char b[480] = {};
__sink(b[479]);
return a[10] + b[20];
}
__noinline static int subprog_deep3(int *a)
{
volatile char b[480] = {};
__sink(b[479]);
return subprog_deep4(a) + b[20];
}
__noinline static int subprog_deep2(int *a)
{
volatile char b[480] = {};
__sink(b[479]);
return subprog_deep3(a) + b[20];
}
__noinline static int subprog_deep1(int *a)
{
volatile char b[480] = {};
__sink(b[479]);
return subprog_deep2(a) + b[20];
}
SEC("struct_ops")
int BPF_PROG(test_1)
{
/* stack size 100 bytes */
int a[25] = {};
a[10] = 1;
val_i = subprog1(a);
bpf_testmod_ops3_call_test_2();
return 0;
}
SEC("struct_ops")
int BPF_PROG(test_2)
{
/* stack size 476 bytes, over 2 KiB with the four 480-byte deep subprogs */
volatile char buf[376] = {};
int a[25] = {};
__sink(buf[375]);
a[10] = 3;
val_j = subprog1(a) + subprog_deep1(a);
return 0;
}
SEC(".struct_ops")
struct bpf_testmod_ops3 testmod_1 = {
.test_1 = (void *)test_1,
.test_2 = (void *)test_2,
};
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