mirror of
https://git.proxmox.com/git/mirror_ubuntu-kernels.git
synced 2025-12-09 09:48:57 +00:00
5bb8d34449
The stack frame when function_graph enable like follows,
--------- <- function sp_on_entry
|
|
|
FAKE_RA <- sp_on_entry - sizeof(pt_regs) + PT_R1
|
--------- <- sp_on_entry - sizeof(pt_regs)
So if we want to get the &FAKE_RA we should get sp_on_entry first. In
the unwinder_prologue case, we can get the sp_on_entry as state->sp,
because we try to calculate each CFA and the ra saved address. But in
the unwinder_guess case, we cannot get it because we do not try to
calculate the CFA. Although LoongArch have not fixed frame, the $ra is
saved at CFA - 8 in most cases, we can try guess, too. As we store the
pc in state, we not need to dereference state->sp, too.
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2022 Loongson Technology Corporation Limited
|
|
*/
|
|
|
|
#ifndef _ASM_LOONGARCH_FTRACE_H
|
|
#define _ASM_LOONGARCH_FTRACE_H
|
|
|
|
#define FTRACE_PLT_IDX 0
|
|
#define FTRACE_REGS_PLT_IDX 1
|
|
#define NR_FTRACE_PLTS 2
|
|
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
|
|
#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#ifndef CONFIG_DYNAMIC_FTRACE
|
|
|
|
#define mcount _mcount
|
|
extern void _mcount(void);
|
|
extern void prepare_ftrace_return(unsigned long self_addr, unsigned long callsite_sp, unsigned long old);
|
|
|
|
#else
|
|
|
|
struct dyn_ftrace;
|
|
struct dyn_arch_ftrace { };
|
|
|
|
#define ARCH_SUPPORTS_FTRACE_OPS 1
|
|
#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
|
|
|
|
#define ftrace_init_nop ftrace_init_nop
|
|
int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
|
|
|
|
static inline unsigned long ftrace_call_adjust(unsigned long addr)
|
|
{
|
|
return addr;
|
|
}
|
|
|
|
void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent);
|
|
|
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
|
|
|
#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
|
|
struct ftrace_ops;
|
|
|
|
struct ftrace_regs {
|
|
struct pt_regs regs;
|
|
};
|
|
|
|
static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
|
|
{
|
|
return &fregs->regs;
|
|
}
|
|
|
|
#define ftrace_graph_func ftrace_graph_func
|
|
void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
|
|
struct ftrace_ops *op, struct ftrace_regs *fregs);
|
|
#endif
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* CONFIG_FUNCTION_TRACER */
|
|
|
|
#endif /* _ASM_LOONGARCH_FTRACE_H */
|