From 6c62461a1ea56db6c5f264e26c52dcc118094697 Mon Sep 17 00:00:00 2001
From: Ming-Yi Lai <ming-yi.lai@mediatek.com>
Date: Wed, 10 Jan 2024 13:19:11 +0800
Subject: Zicfilp: Support enabling userspace Zicfilp mechanism

---
 pk/pk.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'pk')

diff --git a/pk/pk.c b/pk/pk.c
index 31d8c79..dbfaa5a 100644
--- a/pk/pk.c
+++ b/pk/pk.c
@@ -13,6 +13,7 @@
 
 elf_info current;
 long disabled_hart_mask;
+bool zicfilp_enabled;
 
 static void help()
 {
@@ -22,6 +23,7 @@ static void help()
   printk("  -h, --help            Print this help message\n");
   printk("  -p                    Disable on-demand program paging\n");
   printk("  -s                    Print cycles upon termination\n");
+  printk("  --zicfilp             Enable Zicfilp CFI mechanism for user program\n");
 
   shutdown(0);
 }
@@ -54,6 +56,11 @@ static void handle_option(const char* arg)
     return;
   }
 
+  if (strcmp(arg, "--zicfilp") == 0) {
+    zicfilp_enabled = true;
+    return;
+  }
+
   panic("unrecognized option: `%s'", arg);
   suggest_help();
 }
@@ -177,6 +184,8 @@ static void run_loaded_program(size_t argc, char** argv, uintptr_t kstack_top)
   init_tf(&tf, current.entry, stack_top);
   __riscv_flush_icache();
   write_csr(sscratch, kstack_top);
+  if (zicfilp_enabled)
+    set_csr(senvcfg, SENVCFG_LPE);
   start_user(&tf);
 }
 
-- 
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