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Date: Wed, 8 May 2024 10:24:45 +0800 From: "yang.zhang" <gaoshanliukou@....com> To: alexghiti@...osinc.com Cc: paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, "yang.zhang" <yang.zhang@...intek.com> Subject: [PATCH V3] riscv: set trap vector earlier From: "yang.zhang" <yang.zhang@...intek.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@...osinc.com> Signed-off-by: yang.zhang <yang.zhang@...intek.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
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