cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

ftrace.h (3231B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_S390_FTRACE_H
      3#define _ASM_S390_FTRACE_H
      4
      5#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
      6#define ARCH_SUPPORTS_FTRACE_OPS 1
      7#define MCOUNT_INSN_SIZE	6
      8
      9#ifndef __ASSEMBLY__
     10
     11#ifdef CONFIG_CC_IS_CLANG
     12/* https://bugs.llvm.org/show_bug.cgi?id=41424 */
     13#define ftrace_return_address(n) 0UL
     14#else
     15#define ftrace_return_address(n) __builtin_return_address(n)
     16#endif
     17
     18void ftrace_caller(void);
     19
     20extern void *ftrace_func;
     21
     22struct dyn_arch_ftrace { };
     23
     24#define MCOUNT_ADDR 0
     25#define FTRACE_ADDR ((unsigned long)ftrace_caller)
     26
     27#define KPROBE_ON_FTRACE_NOP	0
     28#define KPROBE_ON_FTRACE_CALL	1
     29
     30struct module;
     31struct dyn_ftrace;
     32
     33bool ftrace_need_init_nop(void);
     34#define ftrace_need_init_nop ftrace_need_init_nop
     35
     36int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
     37#define ftrace_init_nop ftrace_init_nop
     38
     39static inline unsigned long ftrace_call_adjust(unsigned long addr)
     40{
     41	return addr;
     42}
     43
     44struct ftrace_regs {
     45	struct pt_regs regs;
     46};
     47
     48static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
     49{
     50	struct pt_regs *regs = &fregs->regs;
     51
     52	if (test_pt_regs_flag(regs, PIF_FTRACE_FULL_REGS))
     53		return regs;
     54	return NULL;
     55}
     56
     57static __always_inline void ftrace_instruction_pointer_set(struct ftrace_regs *fregs,
     58							   unsigned long ip)
     59{
     60	fregs->regs.psw.addr = ip;
     61}
     62
     63/*
     64 * When an ftrace registered caller is tracing a function that is
     65 * also set by a register_ftrace_direct() call, it needs to be
     66 * differentiated in the ftrace_caller trampoline. To do this,
     67 * place the direct caller in the ORIG_GPR2 part of pt_regs. This
     68 * tells the ftrace_caller that there's a direct caller.
     69 */
     70static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr)
     71{
     72	regs->orig_gpr2 = addr;
     73}
     74
     75/*
     76 * Even though the system call numbers are identical for s390/s390x a
     77 * different system call table is used for compat tasks. This may lead
     78 * to e.g. incorrect or missing trace event sysfs files.
     79 * Therefore simply do not trace compat system calls at all.
     80 * See kernel/trace/trace_syscalls.c.
     81 */
     82#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
     83static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
     84{
     85	return is_compat_task();
     86}
     87
     88#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
     89static inline bool arch_syscall_match_sym_name(const char *sym,
     90					       const char *name)
     91{
     92	/*
     93	 * Skip __s390_ and __s390x_ prefix - due to compat wrappers
     94	 * and aliasing some symbols of 64 bit system call functions
     95	 * may get the __s390_ prefix instead of the __s390x_ prefix.
     96	 */
     97	return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
     98}
     99
    100#endif /* __ASSEMBLY__ */
    101
    102#ifdef CONFIG_FUNCTION_TRACER
    103
    104#define FTRACE_NOP_INSN .word 0xc004, 0x0000, 0x0000 /* brcl 0,0 */
    105
    106#ifndef CC_USING_HOTPATCH
    107
    108#define FTRACE_GEN_MCOUNT_RECORD(name)		\
    109	.section __mcount_loc, "a", @progbits;	\
    110	.quad name;				\
    111	.previous;
    112
    113#else /* !CC_USING_HOTPATCH */
    114
    115#define FTRACE_GEN_MCOUNT_RECORD(name)
    116
    117#endif /* !CC_USING_HOTPATCH */
    118
    119#define FTRACE_GEN_NOP_ASM(name)		\
    120	FTRACE_GEN_MCOUNT_RECORD(name)		\
    121	FTRACE_NOP_INSN
    122
    123#else /* CONFIG_FUNCTION_TRACER */
    124
    125#define FTRACE_GEN_NOP_ASM(name)
    126
    127#endif /* CONFIG_FUNCTION_TRACER */
    128
    129#endif /* _ASM_S390_FTRACE_H */