From 8d2e7d9ae3ebc34f8ab5f54ad0e3008c4a80b76d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20=C5=BBenczykowski?= <maze@google.com>
Date: Fri, 19 May 2023 21:06:00 +0000
Subject: [PATCH] bpfloader: ignore_on_arch support
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Test: TreeHugger
Bug: 283523051
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I572fd18b2c778fa67073a5410dcb2410e5c24ff5
---
 libbpf_android/Loader.cpp | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/libbpf_android/Loader.cpp b/libbpf_android/Loader.cpp
index a8ef1a0..7f6aae1 100644
--- a/libbpf_android/Loader.cpp
+++ b/libbpf_android/Loader.cpp
@@ -31,13 +31,13 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
-// This is BpfLoader v0.37
+// This is BpfLoader v0.38
 // WARNING: If you ever hit cherrypick conflicts here you're doing it wrong:
 // You are NOT allowed to cherrypick bpfloader related patches out of order.
 // (indeed: cherrypicking is probably a bad idea and you should merge instead)
 // Mainline supports ONLY the published versions of the bpfloader for each Android release.
 #define BPFLOADER_VERSION_MAJOR 0u
-#define BPFLOADER_VERSION_MINOR 37u
+#define BPFLOADER_VERSION_MINOR 38u
 #define BPFLOADER_VERSION ((BPFLOADER_VERSION_MAJOR << 16) | BPFLOADER_VERSION_MINOR)
 
 #include "BpfSyscallWrappers.h"
@@ -816,6 +816,17 @@ static int createMaps(const char* elfPath, ifstream& elfFile, vector<unique_fd>&
             continue;
         }
 
+        if ((isArm() && isKernel32Bit() && md[i].ignore_on_arm32) ||
+            (isArm() && isKernel64Bit() && md[i].ignore_on_aarch64) ||
+            (isX86() && isKernel32Bit() && md[i].ignore_on_x86_32) ||
+            (isX86() && isKernel64Bit() && md[i].ignore_on_x86_64) ||
+            (isRiscV() && md[i].ignore_on_riscv64)) {
+            ALOGI("skipping map %s which is ignored on %s", mapNames[i].c_str(),
+                  describeArch());
+            mapFds.push_back(unique_fd());
+            continue;
+        }
+
         enum bpf_map_type type = md[i].type;
         if (type == BPF_MAP_TYPE_DEVMAP_HASH && !isAtLeastKernelVersion(5, 4, 0)) {
             // On Linux Kernels older than 5.4 this map type doesn't exist, but it can kind
@@ -1071,6 +1082,15 @@ static int loadCodeSections(const char* elfPath, vector<codeSection>& cs, const
             continue;
         }
 
+        if ((isArm() && isKernel32Bit() && cs[i].prog_def->ignore_on_arm32) ||
+            (isArm() && isKernel64Bit() && cs[i].prog_def->ignore_on_aarch64) ||
+            (isX86() && isKernel32Bit() && cs[i].prog_def->ignore_on_x86_32) ||
+            (isX86() && isKernel64Bit() && cs[i].prog_def->ignore_on_x86_64) ||
+            (isRiscV() && cs[i].prog_def->ignore_on_riscv64)) {
+            ALOGD("cs[%d].name:%s is ignored on %s", i, name.c_str(), describeArch());
+            continue;
+        }
+
         if (unrecognized(pin_subdir)) return -ENOTDIR;
 
         if (specified(selinux_context)) {