mirror of https://github.com/torvalds/linux.git
150 lines
3.7 KiB
C
150 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_S390_FTRACE_H
|
|
#define _ASM_S390_FTRACE_H
|
|
|
|
#define ARCH_SUPPORTS_FTRACE_OPS 1
|
|
#define MCOUNT_INSN_SIZE 6
|
|
|
|
#ifndef __ASSEMBLER__
|
|
#include <asm/stacktrace.h>
|
|
|
|
static __always_inline unsigned long return_address(unsigned int n)
|
|
{
|
|
struct stack_frame *sf;
|
|
|
|
if (!n)
|
|
return (unsigned long)__builtin_return_address(0);
|
|
|
|
sf = (struct stack_frame *)current_frame_address();
|
|
do {
|
|
sf = (struct stack_frame *)sf->back_chain;
|
|
if (!sf)
|
|
return 0;
|
|
} while (--n);
|
|
return sf->gprs[8];
|
|
}
|
|
#define ftrace_return_address(n) return_address(n)
|
|
|
|
void ftrace_caller(void);
|
|
|
|
extern void *ftrace_func;
|
|
|
|
struct dyn_arch_ftrace { };
|
|
|
|
#define MCOUNT_ADDR 0
|
|
#define FTRACE_ADDR ((unsigned long)ftrace_caller)
|
|
|
|
#define KPROBE_ON_FTRACE_NOP 0
|
|
#define KPROBE_ON_FTRACE_CALL 1
|
|
|
|
struct module;
|
|
struct dyn_ftrace;
|
|
struct ftrace_ops;
|
|
|
|
bool ftrace_need_init_nop(void);
|
|
#define ftrace_need_init_nop ftrace_need_init_nop
|
|
|
|
int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
|
|
#define ftrace_init_nop ftrace_init_nop
|
|
|
|
static inline unsigned long ftrace_call_adjust(unsigned long addr)
|
|
{
|
|
return addr;
|
|
}
|
|
#define ftrace_get_symaddr(fentry_ip) ((unsigned long)(fentry_ip))
|
|
|
|
#include <linux/ftrace_regs.h>
|
|
|
|
static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
|
|
{
|
|
struct pt_regs *regs = &arch_ftrace_regs(fregs)->regs;
|
|
|
|
if (test_pt_regs_flag(regs, PIF_FTRACE_FULL_REGS))
|
|
return regs;
|
|
return NULL;
|
|
}
|
|
|
|
static __always_inline void
|
|
ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
|
|
unsigned long ip)
|
|
{
|
|
arch_ftrace_regs(fregs)->regs.psw.addr = ip;
|
|
}
|
|
|
|
#undef ftrace_regs_get_frame_pointer
|
|
static __always_inline unsigned long
|
|
ftrace_regs_get_frame_pointer(struct ftrace_regs *fregs)
|
|
{
|
|
return ftrace_regs_get_stack_pointer(fregs);
|
|
}
|
|
|
|
static __always_inline unsigned long
|
|
ftrace_regs_get_return_address(const struct ftrace_regs *fregs)
|
|
{
|
|
return arch_ftrace_regs(fregs)->regs.gprs[14];
|
|
}
|
|
|
|
#define arch_ftrace_fill_perf_regs(fregs, _regs) do { \
|
|
(_regs)->psw.mask = 0; \
|
|
(_regs)->psw.addr = arch_ftrace_regs(fregs)->regs.psw.addr; \
|
|
(_regs)->gprs[15] = arch_ftrace_regs(fregs)->regs.gprs[15]; \
|
|
} while (0)
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
|
|
/*
|
|
* When an ftrace registered caller is tracing a function that is
|
|
* also set by a register_ftrace_direct() call, it needs to be
|
|
* differentiated in the ftrace_caller trampoline. To do this,
|
|
* place the direct caller in the ORIG_GPR2 part of pt_regs. This
|
|
* tells the ftrace_caller that there's a direct caller.
|
|
*/
|
|
static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr)
|
|
{
|
|
struct pt_regs *regs = &arch_ftrace_regs(fregs)->regs;
|
|
regs->orig_gpr2 = addr;
|
|
}
|
|
#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
|
|
|
|
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
|
|
static inline bool arch_syscall_match_sym_name(const char *sym,
|
|
const char *name)
|
|
{
|
|
/* Skip the __s390x_ prefix. */
|
|
return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
|
|
}
|
|
|
|
void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
|
|
struct ftrace_ops *op, struct ftrace_regs *fregs);
|
|
#define ftrace_graph_func ftrace_graph_func
|
|
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
|
|
#define FTRACE_NOP_INSN .word 0xc004, 0x0000, 0x0000 /* brcl 0,0 */
|
|
|
|
#ifndef CC_USING_HOTPATCH
|
|
|
|
#define FTRACE_GEN_MCOUNT_RECORD(name) \
|
|
.section __mcount_loc, "a", @progbits; \
|
|
.quad name; \
|
|
.previous;
|
|
|
|
#else /* !CC_USING_HOTPATCH */
|
|
|
|
#define FTRACE_GEN_MCOUNT_RECORD(name)
|
|
|
|
#endif /* !CC_USING_HOTPATCH */
|
|
|
|
#define FTRACE_GEN_NOP_ASM(name) \
|
|
FTRACE_GEN_MCOUNT_RECORD(name) \
|
|
FTRACE_NOP_INSN
|
|
|
|
#else /* CONFIG_FUNCTION_TRACER */
|
|
|
|
#define FTRACE_GEN_NOP_ASM(name)
|
|
|
|
#endif /* CONFIG_FUNCTION_TRACER */
|
|
|
|
#endif /* _ASM_S390_FTRACE_H */
|