Merge #23

23: Fix _start_trap alignment r=dvc94ch a=Disasm

Based on this proposal: https://github.com/rust-embedded/riscv-rt/pull/22#issuecomment-466307711

Co-authored-by: Vadim Kaushan <admin@disasm.info>

riscv-rt/asm.S

@@ -36,7 +36,6 @@ _start:
     restores caller saved registers and then returns.
 */
 .section .trap, "ax"
-.align 4
 .global _start_trap
 
 _start_trap:

riscv-rt/link.x

@@ -15,6 +15,7 @@ SECTIONS
     /* point of the program. */
     KEEP(*(.init));
     KEEP(*(.init.rust));
+    . = ALIGN(4);
     KEEP(*(.trap));
     KEEP(*(.trap.rust));