From: Maciej W. Rozycki Date: Mon, 17 Nov 2014 16:09:54 +0000 (+0000) Subject: MIPS: jump_label.c: Correct the span of the J instruction X-Git-Tag: Ubuntu-5.13.0-19.19~19024^2~1 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=99436f7d69045800ffd1d66912f85d37150c7e2b;p=mirror_ubuntu-jammy-kernel.git MIPS: jump_label.c: Correct the span of the J instruction Correct the check for the span of the 256MB segment addressable by the J instruction according to this instruction's semantics. The calculation of the jump target is applied to the address of the delay-slot instruction that immediately follows. Adjust the check accordingly by adding 4 to `e->code' that holds the address of the J instruction itself. Signed-off-by: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8515/ Signed-off-by: Ralf Baechle --- diff --git a/arch/mips/kernel/jump_label.c b/arch/mips/kernel/jump_label.c index 6001610cfe55..f65a843e883b 100644 --- a/arch/mips/kernel/jump_label.c +++ b/arch/mips/kernel/jump_label.c @@ -27,8 +27,8 @@ void arch_jump_label_transform(struct jump_entry *e, union mips_instruction *insn_p = (union mips_instruction *)(unsigned long)e->code; - /* Jump only works within a 256MB aligned region. */ - BUG_ON((e->target & ~J_RANGE_MASK) != (e->code & ~J_RANGE_MASK)); + /* Jump only works within a 256MB aligned region of its delay slot. */ + BUG_ON((e->target & ~J_RANGE_MASK) != ((e->code + 4) & ~J_RANGE_MASK)); /* Target must have 4 byte alignment. */ BUG_ON((e->target & 3) != 0);