130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef _ASM_S390_FTRACE_H
|
||
|
|
#define _ASM_S390_FTRACE_H
|
||
|
|
|
||
|
|
#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
|
||
|
|
#define ARCH_SUPPORTS_FTRACE_OPS 1
|
||
|
|
#define MCOUNT_INSN_SIZE 6
|
||
|
|
|
||
|
|
#ifndef __ASSEMBLY__
|
||
|
|
|
||
|
|
#ifdef CONFIG_CC_IS_CLANG
|
||
|
|
/* https://bugs.llvm.org/show_bug.cgi?id=41424 */
|
||
|
|
#define ftrace_return_address(n) 0UL
|
||
|
|
#else
|
||
|
|
#define ftrace_return_address(n) __builtin_return_address(n)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct ftrace_regs {
|
||
|
|
struct pt_regs regs;
|
||
|
|
};
|
||
|
|
|
||
|
|
static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
|
||
|
|
{
|
||
|
|
struct pt_regs *regs = &fregs->regs;
|
||
|
|
|
||
|
|
if (test_pt_regs_flag(regs, PIF_FTRACE_FULL_REGS))
|
||
|
|
return regs;
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __always_inline void ftrace_instruction_pointer_set(struct ftrace_regs *fregs,
|
||
|
|
unsigned long ip)
|
||
|
|
{
|
||
|
|
fregs->regs.psw.addr = ip;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 pt_regs *regs, unsigned long addr)
|
||
|
|
{
|
||
|
|
regs->orig_gpr2 = addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Even though the system call numbers are identical for s390/s390x a
|
||
|
|
* different system call table is used for compat tasks. This may lead
|
||
|
|
* to e.g. incorrect or missing trace event sysfs files.
|
||
|
|
* Therefore simply do not trace compat system calls at all.
|
||
|
|
* See kernel/trace/trace_syscalls.c.
|
||
|
|
*/
|
||
|
|
#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
|
||
|
|
static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
return is_compat_task();
|
||
|
|
}
|
||
|
|
|
||
|
|
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
|
||
|
|
static inline bool arch_syscall_match_sym_name(const char *sym,
|
||
|
|
const char *name)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Skip __s390_ and __s390x_ prefix - due to compat wrappers
|
||
|
|
* and aliasing some symbols of 64 bit system call functions
|
||
|
|
* may get the __s390_ prefix instead of the __s390x_ prefix.
|
||
|
|
*/
|
||
|
|
return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* __ASSEMBLY__ */
|
||
|
|
|
||
|
|
#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 */
|