* [PATCH V3] riscv: set trap vector earlier
@ 2024-05-08 2:24 yang.zhang
0 siblings, 0 replies; only message in thread
From: yang.zhang @ 2024-05-08 2:24 UTC (permalink / raw
To: alexghiti
Cc: paul.walmsley, palmer, aou, linux-riscv, linux-kernel, yang.zhang
From: "yang.zhang" <yang.zhang@hexintek.com>
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 <alexghiti@rivosinc.com>
Signed-off-by: yang.zhang <yang.zhang@hexintek.com>
---
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/20240506022239.6817-1-gaoshanliukou@163.com
---
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
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2024-05-08 2:25 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-05-08 2:24 [PATCH V3] riscv: set trap vector earlier yang.zhang
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).