Merge pull request #95 from thejpster/pointer-casts

Add function pointer casts

Author: jonathanpallant

examples/mps3-an536/rust-toolchain.toml

@@ -1,5 +1,5 @@
 [toolchain]
-channel = "nightly-2025-10-29"
+channel = "nightly-2025-12-01"
 targets = [
 	"armv8r-none-eabihf",
 ]

examples/mps3-an536/src/bin/abt-exception-a32.rs

@@ -88,7 +88,7 @@ unsafe fn data_abort_handler(addr: usize) -> usize {
     enable_alignment_check();
 
     // note the fault isn't at the start of the function
-    let expect_fault_at = unaligned_from_a32 as usize + 8;
+    let expect_fault_at = unaligned_from_a32 as unsafe extern "C" fn() as usize + 8;
 
     if addr == expect_fault_at {
         println!("caught unaligned_from_a32");

examples/mps3-an536/src/bin/abt-exception-t32.rs

@@ -88,7 +88,7 @@ unsafe fn data_abort_handler(addr: usize) -> usize {
     enable_alignment_check();
 
     // note the fault isn't at the start of the function
-    let expect_fault_at = unaligned_from_t32 as usize + 5;
+    let expect_fault_at = unaligned_from_t32 as unsafe extern "C" fn() as usize + 5;
 
     if addr == expect_fault_at {
         println!("caught unaligned_from_t32");

examples/mps3-an536/src/bin/prefetch-exception-a32.rs

@@ -63,12 +63,12 @@ unsafe fn prefetch_abort_handler(addr: usize) -> usize {
     let ifar = Ifar::read();
     println!("IFAR (Faulting Address Register): {:?}", ifar);
 
-    if addr == bkpt_from_a32 as usize {
+    if addr == bkpt_from_a32 as unsafe extern "C" fn() as usize {
         println!("caught bkpt_from_a32");
     } else {
         println!(
             "Bad fault address {:08x} is not {:08x}",
-            addr, bkpt_from_a32 as usize
+            addr, bkpt_from_a32 as unsafe extern "C" fn() as usize
         );
     }
 

examples/mps3-an536/src/bin/prefetch-exception-t32.rs

@@ -63,15 +63,15 @@ unsafe fn prefetch_abort_handler(addr: usize) -> usize {
     let ifar = Ifar::read();
     println!("IFAR (Faulting Address Register): {:?}", ifar);
 
-    if (addr + 1) == bkpt_from_t32 as usize {
+    if (addr + 1) == bkpt_from_t32 as unsafe extern "C" fn() as usize {
         // note that thumb functions have their LSB set, despite always being a
         // multiple of two - that's how the CPU knows they are written in T32
         // machine code.
         println!("caught bkpt_from_t32");
     } else {
         println!(
             "Bad fault address {:08x} is not {:08x}",
-            addr, bkpt_from_t32 as usize
+            addr, bkpt_from_t32 as unsafe extern "C" fn() as usize
         );
     }
 

examples/mps3-an536/src/bin/undef-exception-a32.rs

@@ -55,12 +55,12 @@ fn prefetch_abort_handler(_addr: usize) -> ! {
 unsafe fn undefined_handler(addr: usize) -> usize {
     println!("undefined abort occurred");
 
-    if addr == udf_from_a32 as usize {
+    if addr == udf_from_a32 as unsafe extern "C" fn() as usize {
         println!("caught udf_from_a32");
     } else {
         println!(
             "Bad fault address {:08x} is not {:08x}",
-            addr, udf_from_a32 as usize
+            addr, udf_from_a32 as unsafe extern "C" fn() as usize
         );
     }
 

examples/mps3-an536/src/bin/undef-exception-t32.rs

@@ -55,15 +55,15 @@ fn prefetch_abort_handler(_addr: usize) -> ! {
 unsafe fn undefined_handler(addr: usize) -> usize {
     println!("undefined abort occurred");
 
-    if (addr + 1) == udf_from_t32 as usize {
+    if (addr + 1) == udf_from_t32 as unsafe extern "C" fn() as usize {
         // note that thumb functions have their LSB set, despite always being a
         // multiple of two - that's how the CPU knows they are written in T32
         // machine code.
         println!("caught udf_from_t32");
     } else {
         println!(
             "Bad fault address {:08x} is not {:08x}",
-            addr, udf_from_t32 as usize
+            addr, udf_from_t32 as unsafe extern "C" fn() as usize
         );
     }
 

examples/versatileab/rust-toolchain.toml

@@ -1,5 +1,5 @@
 [toolchain]
-channel = "nightly-2025-10-29"
+channel = "nightly-2025-12-01"
 targets = [
 	"armv7r-none-eabi",
 	"armv7r-none-eabihf",

examples/versatileab/src/bin/abt-exception-a32.rs

@@ -88,7 +88,7 @@ unsafe fn data_abort_handler(addr: usize) -> usize {
     enable_alignment_check();
 
     // note the fault isn't at the start of the function
-    let expect_fault_at = unaligned_from_a32 as usize + 8;
+    let expect_fault_at = unaligned_from_a32 as unsafe extern "C" fn() as usize + 8;
 
     if addr == expect_fault_at {
         println!("caught unaligned_from_a32");

examples/versatileab/src/bin/abt-exception-t32.rs

@@ -88,7 +88,7 @@ unsafe fn data_abort_handler(addr: usize) -> usize {
     enable_alignment_check();
 
     // note the fault isn't at the start of the function
-    let expect_fault_at = unaligned_from_t32 as usize + 3;
+    let expect_fault_at = unaligned_from_t32 as unsafe extern "C" fn() as usize + 3;
 
     if addr == expect_fault_at {
         println!("caught unaligned_from_t32");