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authorJinyang He <hejinyang@loongson.cn>2023-01-17 06:42:16 +0300
committerHuacai Chen <chenhuacai@loongson.cn>2023-01-17 06:42:16 +0300
commitdc74a9e8a8c57966a563ab078ba91c8b2c0d0a72 (patch)
treebee8ccfdc8c2d89cc9eaf5caeab25771aef92761 /arch/loongarch/mm
parentc5ac25e0d78a6f63446b8fef4d8630ccd7a2663d (diff)
downloadlinux-dc74a9e8a8c57966a563ab078ba91c8b2c0d0a72.tar.xz
LoongArch: Add generic ex-handler unwind in prologue unwinder
When exception is triggered, code flow go handle_\exception in some cases. One of stackframe in this case as follows, high -> +-------+ | REGS | <- a pt_regs | | | | <- ex trigger | REGS | <- ex pt_regs <-+ | | | | | | low -> +-------+ ->unwind-+ When unwinder unwinds to handler_\exception it cannot go on prologue analysis. Because it is an asynchronous code flow, we should get the next frame PC from regs->csr_era rather than regs->regs[1]. At init time we copy the handlers to eentry and also copy them to NUMA-affine memory named pcpu_handlers if NUMA is enabled. Thus, unwinder cannot unwind normally. To solve this, we try to give some hints in handler_\exception and fixup unwinders in unwind_next_frame(). Reported-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/mm')
-rw-r--r--arch/loongarch/mm/tlb.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/loongarch/mm/tlb.c b/arch/loongarch/mm/tlb.c
index da3681f131c8..8bad6b0cff59 100644
--- a/arch/loongarch/mm/tlb.c
+++ b/arch/loongarch/mm/tlb.c
@@ -251,7 +251,7 @@ static void output_pgtable_bits_defines(void)
}
#ifdef CONFIG_NUMA
-static unsigned long pcpu_handlers[NR_CPUS];
+unsigned long pcpu_handlers[NR_CPUS];
#endif
extern long exception_handlers[VECSIZE * 128 / sizeof(long)];