diff options
| -rw-r--r-- | arch/arm64/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm64/include/asm/ptrace.h | 22 |
2 files changed, 23 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 555af5035592..c383625ec02c 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -148,6 +148,7 @@ config ARM64 select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP select HAVE_REGS_AND_STACK_ACCESS_API + select HAVE_FUNCTION_ARG_ACCESS_API select HAVE_RCU_TABLE_FREE select HAVE_RCU_TABLE_INVALIDATE select HAVE_RSEQ diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index ec60174c8c18..b2de32939ada 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -305,6 +305,28 @@ static inline unsigned long regs_return_value(struct pt_regs *regs) return regs->regs[0]; } +/** + * regs_get_kernel_argument() - get Nth function argument in kernel + * @regs: pt_regs of that context + * @n: function argument number (start from 0) + * + * regs_get_argument() returns @n th argument of the function call. + * + * Note that this chooses the most likely register mapping. In very rare + * cases this may not return correct data, for example, if one of the + * function parameters is 16 bytes or bigger. In such cases, we cannot + * get access the parameter correctly and the register assignment of + * subsequent parameters will be shifted. + */ +static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs, + unsigned int n) +{ +#define NR_REG_ARGUMENTS 8 + if (n < NR_REG_ARGUMENTS) + return pt_regs_read_reg(regs, n); + return 0; +} + /* We must avoid circular header include via sched.h */ struct task_struct; int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task); |