From 9308579fef3ddde19da9d45e23bf36d41932417f Mon Sep 17 00:00:00 2001 From: Jinyang He Date: Thu, 21 Jan 2021 13:31:36 +0800 Subject: [PATCH] MIPS: microMIPS: Fix the judgment of mm_jr16_op and mm_jalr_op mm16_r5_format.rt is 5 bits, so directly judge the value if equal or not. mm_jalr_op requires 7th to 16th bits. These 10 which bits generated by shifting u_format.uimmediate by 6 may be affected by sign extension. Thus, take out the 10 bits for comparison. Without this patch, errors may occur, such as these bits are all ones. Signed-off-by: Jinyang He Signed-off-by: Thomas Bogendoerfer --- arch/mips/kernel/process.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 0c5bc06..c2f9e18 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -294,8 +294,8 @@ static inline int is_jump_ins(union mips_instruction *ip) * microMIPS is kind of more fun... */ if (mm_insn_16bit(ip->word >> 16)) { - if ((ip->mm16_r5_format.opcode == mm_pool16c_op && - (ip->mm16_r5_format.rt & mm_jr16_op) == mm_jr16_op)) + if (ip->mm16_r5_format.opcode == mm_pool16c_op && + ip->mm16_r5_format.rt == mm_jr16_op) return 1; return 0; } @@ -307,7 +307,7 @@ static inline int is_jump_ins(union mips_instruction *ip) if (ip->r_format.opcode != mm_pool32a_op || ip->r_format.func != mm_pool32axf_op) return 0; - return ((ip->u_format.uimmediate >> 6) & mm_jalr_op) == mm_jalr_op; + return ((ip->u_format.uimmediate >> 6) & GENMASK(9, 0)) == mm_jalr_op; #else if (ip->j_format.opcode == j_op) return 1; -- 2.7.4