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LoongArch/ftrace: Add HAVE_DYNAMIC_FTRACE_WITH_ARGS support

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Allow for arguments to be passed in to ftrace_regs by default. If this
is set, then arguments and stack can be found from the pt_regs.

1. HAVE_DYNAMIC_FTRACE_WITH_ARGS don't need special hook for graph
tracer entry point, but instead we can use graph_ops::func function to
install the return_hooker.

2. Livepatch requires this option in the future.

Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Qing Zhang 2022-12-10 22:40:16 +08:00 committed by Huacai Chen
parent 8778ba2c8a
commit ac7127e1cc
3 changed files with 29 additions and 0 deletions
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1
arch/loongarch/Kconfig
View file

@ -89,6 +89,7 @@ config LOONGARCH
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_DMA_CONTIGUOUS
select HAVE_DYNAMIC_FTRACE
select HAVE_DYNAMIC_FTRACE_WITH_ARGS
select HAVE_DYNAMIC_FTRACE_WITH_REGS
select HAVE_EBPF_JIT
select HAVE_EXIT_THREAD

17
arch/loongarch/include/asm/ftrace.h
View file

@ -37,6 +37,23 @@ 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 */

11
arch/loongarch/kernel/ftrace_dyn.c
View file

@ -139,6 +139,16 @@ void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent)
*parent = return_hooker;
}
#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct ftrace_regs *fregs)
{
struct pt_regs *regs = &fregs->regs;
unsigned long *parent = (unsigned long *)&regs->regs[1];
prepare_ftrace_return(ip, (unsigned long *)parent);
}
#else
static int ftrace_modify_graph_caller(bool enable)
{
u32 branch, nop;
@ -166,4 +176,5 @@ int ftrace_disable_ftrace_graph_caller(void)
{
return ftrace_modify_graph_caller(false);
}
#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */