ARM: kprobes: Add bx_write_pc() (059987ff) · Commits · 戴 / test

This writes a value to PC, with interworking. I.e. switches to Thumb or ARM mode depending on the state of the least significant bit. Signed-off-by:

arch/arm/kernel/kprobes.h

+14 −0

Original line number	Diff line number	Diff line
		@@ -95,6 +95,20 @@ static inline unsigned long it_advance(unsigned long cpsr)
		return cpsr;
		}

		static inline void __kprobes bx_write_pc(long pcv, struct pt_regs *regs)
		{
		long cpsr = regs->ARM_cpsr;
		if (pcv & 0x1) {
		cpsr \|= PSR_T_BIT;
		pcv &= ~0x1;
		} else {
		cpsr &= ~PSR_T_BIT;
		pcv &= ~0x2; /* Avoid UNPREDICTABLE address allignment */
		}
		regs->ARM_cpsr = cpsr;
		regs->ARM_pc = pcv;
		}

		void __kprobes kprobe_simulate_nop(struct kprobe p, struct pt_regs regs);
		void __kprobes kprobe_emulate_none(struct kprobe p, struct pt_regs regs);