Add some Armv8-M assembly routines

Adds access to MSP_NS and the BXNS instruction.
Also adds __dsb which was missing.

Signed-off-by: Hugues de Valon <[email protected]>

Author: hug-dev

asm/inline.rs

@@ -308,6 +308,23 @@ mod v8m {
         asm!("ttat {target}, {target}", target = inout(reg) target);
         target
     }
+
+    #[inline(always)]
+    pub unsafe fn __msp_ns_r() -> u32 {
+        let r;
+        asm!("mrs {}, MSP_NS", out(reg) r);
+        r
+    }
+
+    #[inline(always)]
+    pub unsafe fn __msp_ns_w(val: u32) {
+        asm!("msr MSP_NS, {}", in(reg) val);
+    }
+
+    #[inline(always)]
+    pub unsafe fn __bxns(val: u32) {
+        asm!("BXNS {}", in(reg) val);
+    }
 }
 
 #[cfg(armv8m_main)]

asm/lib.rs

@@ -60,6 +60,7 @@ shims! {
     fn __cpsie();
     fn __delay(cyc: u32);
     fn __dmb();
+    fn __dsb();
     fn __isb();
     fn __msp_r() -> u32;
     fn __msp_w(val: u32);
@@ -97,6 +98,9 @@ shims! {
     fn __ttt(target: u32) -> u32;
     fn __tta(target: u32) -> u32;
     fn __ttat(target: u32) -> u32;
+    fn __msp_ns_r() -> u32;
+    fn __msp_ns_w(val: u32);
+    fn __bxns(val: u32);
 }
 
 // Mainline only.