From e27f04cd8291b7770f5d9282ef1d7ab267dd7cdb Mon Sep 17 00:00:00 2001
From: Grumme2 <agh@live.se>
Date: Thu, 16 Apr 2020 10:41:06 +0200
Subject: [PATCH] bare4_2
---
examples/bare4.rs | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/examples/bare4.rs b/examples/bare4.rs
index 1a381a5..5186bc9 100644
--- a/examples/bare4.rs
+++ b/examples/bare4.rs
@@ -36,8 +36,8 @@ use address::*;
#[inline(always)]
fn read_u32(addr: u32) -> u32 {
- unsafe { core::ptr::read_volatile(addr as *const _) }
- //core::ptr::read_volatile(addr as *const _)
+ // unsafe { core::ptr::read_volatile(addr as *const _) }
+ core::ptr::read_volatile(addr as *const _)
}
#[inline(always)]
@@ -106,6 +106,17 @@ fn main() -> ! {
// What was the error message and explain why.
//
// ** your answer here **
+// error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
+// --> examples/bare4.rs:40:5
+// |
+// 40 | core::ptr::read_volatile(addr as *const _)
+// | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ call to unsafe function
+// |
+// = note: consult the function's documentation for information on how to avoid undefined behavior
+//
+// error: aborting due to previous error
+//
+// Reading adresses is not safe so it panics
//
// Digging a bit deeper, why do you think `read_volatile` is declared `unsafe`.
// (https://doc.rust-lang.org/core/ptr/fn.read_volatile.html, for some food for thought )
--
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