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Commit b7c02b73 authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Fill in rest of HAVE_REGS_AND_STACK_ACCESS_API 



This lets us enable KPROBE_EVENTS.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5a7ad114

arch/sparc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ config SPARC64 
	select HAVE_ARCH_AUDITSYSCALL

	select ARCH_SUPPORTS_ATOMIC_RMW

	select HAVE_NMI

	select HAVE_REGS_AND_STACK_ACCESS_API



config ARCH_DEFCONFIG

	string

arch/sparc/include/asm/ptrace.h

+2 −1
Original line number Diff line number Diff line
@@ -83,7 +83,8 @@ unsigned long profile_pc(struct pt_regs *); 


#define MAX_REG_OFFSET (offsetof(struct pt_regs, magic))



extern int regs_query_register_offset(const char *name);

int regs_query_register_offset(const char *name);

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



/**

 * regs_get_register() - get register value from its offset

arch/sparc/kernel/ptrace_64.c

+36 −0
Original line number Diff line number Diff line
@@ -1162,3 +1162,39 @@ int regs_query_register_offset(const char *name) 
			return roff->offset;

	return -EINVAL;

}



/**

 * 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.

 */

static inline int regs_within_kernel_stack(struct pt_regs *regs,

					   unsigned long addr)

{

	unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;

	return ((addr & ~(THREAD_SIZE - 1))  ==

		(ksp & ~(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 ksp = kernel_stack_pointer(regs) + STACK_BIAS;

	unsigned long *addr = (unsigned long *)ksp;

	addr += n;

	if (regs_within_kernel_stack(regs, (unsigned long)addr))

		return *addr;

	else

		return 0;

}