parisc: add functions required by KPROBE_EVENTS (ea1afe33) · Commits · 戴 / test

arch/parisc/include/asm/ptrace.h

+13 −0

Original line number	Diff line number	Diff line
		@@ -37,4 +37,17 @@ extern int regs_query_register_offset(const char *name);
		extern const char *regs_query_register_name(unsigned int offset);
		#define MAX_REG_OFFSET (offsetof(struct pt_regs, ipsw))

		#define kernel_stack_pointer(regs) ((regs)->gr[30])

		static inline unsigned long regs_get_register(struct pt_regs *regs,
		unsigned int offset)
		{
		if (unlikely(offset > MAX_REG_OFFSET))
		return 0;
		return (unsigned long )((unsigned long)regs + offset);
		}

		unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n);
		int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);

		#endif

+35 −0

Original line number	Diff line number	Diff line
		@@ -789,3 +789,38 @@ const char *regs_query_register_name(unsigned int offset)
		return roff->name;
		return NULL;
		}

		/**
		* regs_within_kernel_stack() - check the address in the stack
		* @regs: pt_regs which contains kernel stack pointer.
		* @addr: address which is checked.
		*
		* regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
		* If @addr is within the kernel stack, it returns true. If not, returns false.
		*/
		int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
		{
		return ((addr & ~(THREAD_SIZE - 1)) ==
		(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
		}

		/**
		* regs_get_kernel_stack_nth() - get Nth entry of the stack
		* @regs: pt_regs which contains kernel stack pointer.
		* @n: stack entry number.
		*
		* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
		* is specified by @regs. If the @n th entry is NOT in the kernel stack,
		* this returns 0.
		*/
		unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
		{
		unsigned long addr = (unsigned long )kernel_stack_pointer(regs);

		addr -= n;

		if (!regs_within_kernel_stack(regs, (unsigned long)addr))
		return 0;

		return *addr;
		}