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riscv/purgatory: align riscv_kernel_entry

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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>
This commit is contained in:
Daniel Maslowski 2024-07-19 19:04:37 +02:00 committed by Palmer Dabbelt
parent b75a22e7d4
commit fb197c5d2f
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arch/riscv/purgatory/entry.S
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@ -7,6 +7,7 @@
* Author: Li Zhengyu (lizhengyu3@huawei.com)
*
*/
#include <asm/asm.h>
#include <linux/linkage.h>
.text
@ -34,6 +35,7 @@ SYM_CODE_END(purgatory_start)
.data
.align LGREG
SYM_DATA(riscv_kernel_entry, .quad 0)
.end