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| author | David S. Miller <davem@davemloft.net> | 2017-04-23 17:15:51 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-23 17:15:51 -0700 |
| commit | b7c02b733c010eb65ab8957dc0d023763a3182bc (patch) | |
| tree | 4ee545055dcb143092f872e38b9da644cb53508e | |
| parent | 5a7ad1146caa895ad718a534399e38bd2ba721b7 (diff) | |
| download | lwn-b7c02b733c010eb65ab8957dc0d023763a3182bc.tar.gz lwn-b7c02b733c010eb65ab8957dc0d023763a3182bc.zip | |
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>
| -rw-r--r-- | arch/sparc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/sparc/include/asm/ptrace.h | 3 | ||||
| -rw-r--r-- | arch/sparc/kernel/ptrace_64.c | 36 |
3 files changed, 39 insertions, 1 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index a59deaef21e5..3db2543733a5 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -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 diff --git a/arch/sparc/include/asm/ptrace.h b/arch/sparc/include/asm/ptrace.h index ca57f08bd3db..d73428e4333c 100644 --- a/arch/sparc/include/asm/ptrace.h +++ b/arch/sparc/include/asm/ptrace.h @@ -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 diff --git a/arch/sparc/kernel/ptrace_64.c b/arch/sparc/kernel/ptrace_64.c index fc5124ccdb53..e1d965e90e16 100644 --- a/arch/sparc/kernel/ptrace_64.c +++ b/arch/sparc/kernel/ptrace_64.c @@ -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; +} |