From: "yang.zhang" <[email protected]>
The exception vector of the booting hart is not set before enabling
the mmu and then still points to the value of the previous firmware,
typically _start. That makes it hard to debug setup_vm() when bad
things happen. So fix that by setting the exception vector earlier.
Reviewed-by: Alexandre Ghiti <[email protected]>
Signed-off-by: yang.zhang <[email protected]>
---
V2 -> v3:
- Fix commit message
v1 -> v2:
- As Alex commented, remove the patch for supporting hugesize kernek image
- Add the omissive logic of set trap vector earlier
https://lore.kernel.org/lkml/[email protected]
---
arch/riscv/kernel/head.S | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index 4236a69c35cb..03dc440e643e 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -300,6 +300,9 @@ SYM_CODE_START(_start_kernel)
#else
mv a0, a1
#endif /* CONFIG_BUILTIN_DTB */
+ /* Set trap vector to spin forever to help debug */
+ la a3, .Lsecondary_park
+ csrw CSR_TVEC, a3
call setup_vm
#ifdef CONFIG_MMU
la a0, early_pg_dir
--
2.25.1