Commit a823c35f authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Will Deacon

arm64: ptrace: Add function argument access API

Add regs_get_argument() which returns N th argument of the function
call. On arm64, it supports up to 8th argument.
Note that this chooses most probably assignment, in some case
it can be incorrect (e.g. passing data structure or floating
point etc.)

This enables ftrace kprobe events to access kernel function
arguments via $argN syntax.
Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
[will: tidied up the comment a bit]
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 691efbed
...@@ -148,6 +148,7 @@ config ARM64 ...@@ -148,6 +148,7 @@ config ARM64
select HAVE_PERF_REGS select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP select HAVE_PERF_USER_STACK_DUMP
select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_FUNCTION_ARG_ACCESS_API
select HAVE_RCU_TABLE_FREE select HAVE_RCU_TABLE_FREE
select HAVE_RCU_TABLE_INVALIDATE select HAVE_RCU_TABLE_INVALIDATE
select HAVE_RSEQ select HAVE_RSEQ
......
...@@ -305,6 +305,28 @@ static inline unsigned long regs_return_value(struct pt_regs *regs) ...@@ -305,6 +305,28 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
return regs->regs[0]; return regs->regs[0];
} }
/**
* 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 that this chooses the most likely register mapping. In very rare
* cases this may not return correct data, for example, if one of the
* function parameters is 16 bytes or bigger. In such cases, we cannot
* get access the parameter correctly and the register assignment of
* subsequent parameters will be shifted.
*/
static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
unsigned int n)
{
#define NR_REG_ARGUMENTS 8
if (n < NR_REG_ARGUMENTS)
return pt_regs_read_reg(regs, n);
return 0;
}
/* We must avoid circular header include via sched.h */ /* We must avoid circular header include via sched.h */
struct task_struct; struct task_struct;
int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task); int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task);
......
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