From d01bdda2fd40728810c2a989b248dd4f5d369a7b Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Mon, 31 Aug 2020 23:19:01 +0200
Subject: Add __syscall assembly

---
 asm/inline.rs | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'asm/inline.rs')

diff --git a/asm/inline.rs b/asm/inline.rs
index 9a0c66e..688604e 100644
--- a/asm/inline.rs
+++ b/asm/inline.rs
@@ -175,6 +175,13 @@ pub unsafe fn __wfi() {
     asm!("wfi");
 }
 
+/// Semihosting syscall.
+#[inline(always)]
+pub unsafe fn __syscall(mut nr: u32, arg: u32) -> u32 {
+    asm!("bkpt #0xab", inout("r0") nr, in("r1") arg);
+    nr
+}
+
 // v7m *AND* v8m.main, but *NOT* v8m.base
 #[cfg(any(armv7m, armv8m_main))]
 pub use self::v7m::*;
-- 
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