diff options
| -rw-r--r-- | arch/riscv/Kconfig | 1 | ||||
| -rw-r--r-- | arch/riscv/include/asm/ptrace.h | 31 |
2 files changed, 32 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 7304278dbbe9..1e8dde174946 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -90,6 +90,7 @@ config RISCV 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_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS select IRQ_DOMAIN diff --git a/arch/riscv/include/asm/ptrace.h b/arch/riscv/include/asm/ptrace.h index 09ad4e923510..6ecd461129d2 100644 --- a/arch/riscv/include/asm/ptrace.h +++ b/arch/riscv/include/asm/ptrace.h @@ -141,6 +141,37 @@ static inline unsigned long regs_get_register(struct pt_regs *regs, return *(unsigned long *)((unsigned long)regs + offset); } + +/** + * 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 you can get the parameter correctly if the function has no + * more than eight arguments. + */ +static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs, + unsigned int n) +{ + static const int nr_reg_arguments = 8; + static const unsigned int argument_offs[] = { + offsetof(struct pt_regs, a0), + offsetof(struct pt_regs, a1), + offsetof(struct pt_regs, a2), + offsetof(struct pt_regs, a3), + offsetof(struct pt_regs, a4), + offsetof(struct pt_regs, a5), + offsetof(struct pt_regs, a6), + offsetof(struct pt_regs, a7), + }; + + if (n < nr_reg_arguments) + return regs_get_register(regs, argument_offs[n]); + return 0; +} + #endif /* __ASSEMBLY__ */ #endif /* _ASM_RISCV_PTRACE_H */ |