From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/kernel/bpf/tnum.c | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/kernel/kernel/bpf/tnum.c b/kernel/kernel/bpf/tnum.c
index 84984c0..ceac528 100644
--- a/kernel/kernel/bpf/tnum.c
+++ b/kernel/kernel/bpf/tnum.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/* tnum: tracked (or tristate) numbers
*
* A tnum tracks knowledge about the bits of a value. Each bit can be either
@@ -193,3 +194,18 @@
str[min(size - 1, (size_t)64)] = 0;
return 64;
}
+
+struct tnum tnum_subreg(struct tnum a)
+{
+ return tnum_cast(a, 4);
+}
+
+struct tnum tnum_clear_subreg(struct tnum a)
+{
+ return tnum_lshift(tnum_rshift(a, 32), 32);
+}
+
+struct tnum tnum_const_subreg(struct tnum a, u32 value)
+{
+ return tnum_or(tnum_clear_subreg(a), tnum_const(value));
+}
--
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