riscv/purgatory: align riscv_kernel_entry

commit fb197c5d2fd24b9af3d4697d0cf778645846d6d5 upstream.

When alignment handling is delegated to the kernel, everything must be
word-aligned in purgatory, since the trap handler is then set to the
kexec one. Without the alignment, hitting the exception would
ultimately crash. On other occasions, the kernel's handler would take
care of exceptions.
This has been tested on a JH7110 SoC with oreboot and its SBI delegating
unaligned access exceptions and the kernel configured to handle them.

Fixes: 736e30af583fb ("RISC-V: Add purgatory")
Signed-off-by: Daniel Maslowski <cyrevolt@gmail.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240719170437.247457-1-cyrevolt@gmail.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/riscv/purgatory/entry.S b/arch/riscv/purgatory/entry.S
index 0194f4554130ae6b89cf5db97a069a65bc2c6fc1..a4ede42bc15107570e350e26f72b3fe80ad2ea31 100644 (file)
--- a/arch/riscv/purgatory/entry.S
+++ b/arch/riscv/purgatory/entry.S
@@ -11,6 +11,8 @@
 .macro size, sym:req
        .size \sym, . - \sym
 .endm
+#include <asm/asm.h>
+#include <linux/linkage.h>
 
 .text
 
@@ -39,6 +41,7 @@ size purgatory_start
 
 .data
 
+.align LGREG
 .globl riscv_kernel_entry
 riscv_kernel_entry:
        .quad   0