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sparc64: Fill in rest of HAVE_REGS_AND_STACK_ACCESS_API 

This lets us enable KPROBE_EVENTS.

Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
David S. Miller 2017-04-23 17:15:51 -07:00
parent 5a7ad1146c
commit b7c02b733c
3 changed files with 39 additions and 1 deletions
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1
arch/sparc/Kconfig
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@ -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

3
arch/sparc/include/asm/ptrace.h
View File

@ -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

36
arch/sparc/kernel/ptrace_64.c
View File

@ -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;
}