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Handle specific LoongArch BRK break codes in user-mode emulation to deliver accurate floating-point exception signals. Specifically, BRK_OVERFLOW (6) triggers TARGET_FPE_INTOVF, and BRK_DIVZERO (7) triggers TARGET_FPE_INTDIV. Other BRK codes fall back to a generic SIGTRAP. This improves correctness for programs that rely on BRK to signal overflow or divide-by-zero conditions. Signed-off-by: WANG Rui <wangrui@loongson.cn> Acked-by: Song Gao <gaosong@loongson.cn> Message-Id: <20250414074952.6253-1-wangrui@loongson.cn> Signed-off-by: Song Gao <gaosong@loongson.cn>