From 42d038c4fb00f1ec1a4c4616784da4561385b628 Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Tue, 6 Aug 2019 18:00:14 +0800 Subject: arm64: Add support for function error injection Inspired by the commit 7cd01b08d35f ("powerpc: Add support for function error injection"), this patch supports function error injection for Arm64. This patch mainly support two functions: one is regs_set_return_value() which is used to overwrite the return value; the another function is override_function_with_return() which is to override the probed function returning and jump to its caller. Reviewed-by: Masami Hiramatsu Signed-off-by: Leo Yan Signed-off-by: Will Deacon --- arch/arm64/include/asm/ptrace.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/arm64/include') diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index 1dcf63a9ac1f..fbebb411ae20 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -301,6 +301,11 @@ static inline unsigned long regs_return_value(struct pt_regs *regs) return regs->regs[0]; } +static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc) +{ + regs->regs[0] = rc; +} + /** * regs_get_kernel_argument() - get Nth function argument in kernel * @regs: pt_regs of that context -- cgit v1.2.3