6.6-stable review patch. If anyone has any objections, please let me know.
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From: yang.zhang yang.zhang@hexintek.com
[ Upstream commit 6ad8735994b854b23c824dd6b1dd2126e893a3b4 ]
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 Link: https://lore.kernel.org/r/20240508022445.6131-1-gaoshanliukou@163.com Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 0097c145385f..9691fa8f2faa 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -305,6 +305,9 @@ clear_bss_done: #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