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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_FTRACE_REGS_H
#define _LINUX_FTRACE_REGS_H
/*
* For archs that just copy pt_regs in ftrace regs, it can use this default.
* If an architecture does not use pt_regs, it must define all the below
* accessor functions.
*/
#ifndef HAVE_ARCH_FTRACE_REGS
struct __arch_ftrace_regs {
struct pt_regs regs;
};
#define arch_ftrace_regs(fregs) ((struct __arch_ftrace_regs *)(fregs))
struct ftrace_regs;
#define ftrace_regs_get_instruction_pointer(fregs) \
instruction_pointer(&arch_ftrace_regs(fregs)->regs)
#define ftrace_regs_get_argument(fregs, n) \
regs_get_kernel_argument(&arch_ftrace_regs(fregs)->regs, n)
#define ftrace_regs_get_stack_pointer(fregs) \
kernel_stack_pointer(&arch_ftrace_regs(fregs)->regs)
#define ftrace_regs_get_return_value(fregs) \
regs_return_value(&arch_ftrace_regs(fregs)->regs)
#define ftrace_regs_set_return_value(fregs, ret) \
regs_set_return_value(&arch_ftrace_regs(fregs)->regs, ret)
#define ftrace_override_function_with_return(fregs) \
override_function_with_return(&arch_ftrace_regs(fregs)->regs)
#define ftrace_regs_query_register_offset(name) \
regs_query_register_offset(name)
#define ftrace_regs_get_frame_pointer(fregs) \
frame_pointer(&arch_ftrace_regs(fregs)->regs)
static __always_inline void
ftrace_partial_regs_update(struct ftrace_regs *fregs, struct pt_regs *regs) { }
#else
/*
* ftrace_partial_regs_update - update the original ftrace_regs from regs
* @fregs: The ftrace_regs to update from @regs
* @regs: The partial regs from ftrace_partial_regs() that was updated
*
* Some architectures have the partial regs living in the ftrace_regs
* structure, whereas other architectures need to make a different copy
* of the @regs. If a partial @regs is retrieved by ftrace_partial_regs() and
* if the code using @regs updates a field (like the instruction pointer or
* stack pointer) it may need to propagate that change to the original @fregs
* it retrieved the partial @regs from. Use this function to guarantee that
* update happens.
*/
static __always_inline void
ftrace_partial_regs_update(struct ftrace_regs *fregs, struct pt_regs *regs)
{
ftrace_regs_set_instruction_pointer(fregs, instruction_pointer(regs));
ftrace_regs_set_return_value(fregs, regs_return_value(regs));
}
#endif /* HAVE_ARCH_FTRACE_REGS */
/* This can be overridden by the architectures */
#ifndef FTRACE_REGS_MAX_ARGS
# define FTRACE_REGS_MAX_ARGS 6
#endif
#endif /* _LINUX_FTRACE_REGS_H */
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