bare1_3

examples/bare1.rs

@@ -27,7 +27,7 @@ fn main() {
 
     // to prevent returning
     loop {
-        // cortex_m::asm::nop();
+        cortex_m::asm::nop();
         // cortex_m::asm::bkpt();
     }
 }
@@ -54,14 +54,64 @@ fn main() {
 // what is shown in the Dissasmbly view, what instruction is executing
 // (if you are NOT under eclipse, then give the command in gdb console
 // (gdb) disassemble
-// ** your answer here **
+// Dump of assembler code for function bare1::main:
+//     0x08000f64 <+0>:	push	{r7, lr}
+//     0x08000f66 <+2>:	mov	r7, sp
+//     0x08000f68 <+4>:	sub	sp, #48	; 0x30
+//     0x08000f6a <+6>:	movw	r0, #15472	; 0x3c70            <------ for itm
+//     0x08000f6e <+10>:	movt	r0, #2048	; 0x800
+//     0x08000f72 <+14>:	ldr	r0, [r0, #0]
+//     0x08000f74 <+16>:	bl	0x80004d6 <<bare_metal::Peripheral<T>>::get>
+//     0x08000f78 <+20>:	str	r0, [sp, #8]
+//     0x08000f7a <+22>:	b.n	0x8000f7c <bare1::main+24>
+//     0x08000f7c <+24>:	b.n	0x8000f7e <bare1::main+26>
+//     0x08000f7e <+26>:	movw	r1, #15488	; 0x3c80
+//     0x08000f82 <+30>:	movt	r1, #2048	; 0x800
+//     0x08000f86 <+34>:	movs	r2, #17
+//     0x08000f88 <+36>:	ldr	r0, [sp, #8]
+//     0x08000f8a <+38>:	bl	0x80021a4 <cortex_m::itm::write_str>
+//     0x08000f8e <+42>:	b.n	0x8000f90 <bare1::main+44>
+//     0x08000f90 <+44>:	add	r0, sp, #16
+//     0x08000f92 <+46>:	bl	0x80012f2 <cortex_m_semihosting::hio::hstdout>  <--- semihosting
+//     0x08000f96 <+50>:	b.n	0x8000f98 <bare1::main+52>
+//     0x08000f98 <+52>:	add	r0, sp, #16
+//     0x08000f9a <+54>:	bl	0x80008d6 <<core::result::Result<T, E>>::unwrap>
+//     0x08000f9e <+58>:	str	r0, [sp, #12]
+//     0x08000fa0 <+60>:	b.n	0x8000fa2 <bare1::main+62>
+//     0x08000fa2 <+62>:	mov	r0, sp
+//     0x08000fa4 <+64>:	movs	r1, #0
+//     0x08000fa6 <+66>:	str	r1, [r0, #0]
+//     0x08000fa8 <+68>:	movw	r1, #15548	; 0x3cbc
+//     0x08000fac <+72>:	movt	r1, #2048	; 0x800
+//     0x08000fb0 <+76>:	movw	r3, #15556	; 0x3cc4
+//     0x08000fb4 <+80>:	movt	r3, #2048	; 0x800
+//     0x08000fb8 <+84>:	add	r0, sp, #24
+//     0x08000fba <+86>:	movs	r2, #1
+//     0x08000fbc <+88>:	bl	0x8000b22 <core::fmt::Arguments::new_v1>
+//     0x08000fc0 <+92>:	b.n	0x8000fc2 <bare1::main+94>
+//     0x08000fc2 <+94>:	add	r0, sp, #12
+//     0x08000fc4 <+96>:	add	r1, sp, #24
+//     0x08000fc6 <+98>:	bl	0x8000a6a <core::fmt::Write::write_fmt>
+//     0x08000fca <+102>:	str	r0, [sp, #4]
+//     0x08000fcc <+104>:	b.n	0x8000fce <bare1::main+106>
+//     0x08000fce <+106>:	ldr	r0, [sp, #4]
+//     0x08000fd0 <+108>:	and.w	r0, r0, #1
+//     0x08000fd4 <+112>:	bl	0x800088c <<core::result::Result<T, E>>::unwrap>
+//     0x08000fd8 <+116>:	b.n	0x8000fda <bare1::main+118>
+//     0x08000fda <+118>:	b.n	0x8000fdc <bare1::main+120>
+//  => 0x08000fdc <+120>:	b.n	0x8000fdc <bare1::main+120>
+//
+//  All instructions are executed!
 //
 // commit your answers (bare1_2)
 //
 // 3. now remove the comment line 30.
 // rebuild and debug, pause the program.
 // what is shown in the Dissasmbly view, what instruction is executing
-// ** your answer here **
+//
+// 0x08000fdc <+120>:	nop
+//
+// Line 30 creates a nop instruction
 //
 // commit your answers (bare1_3)
 //