| /* 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; |
| } |
| |
| #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| struct fgraph_ret_regs { |
| unsigned long gpr2; |
| unsigned long fp; |
| }; |
| |
| static __always_inline unsigned long fgraph_ret_regs_return_value(struct fgraph_ret_regs *ret_regs) |
| { |
| return ret_regs->gpr2; |
| } |
| |
| static __always_inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph_ret_regs *ret_regs) |
| { |
| return ret_regs->fp; |
| } |
| #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| |
| static __always_inline unsigned long |
| ftrace_regs_get_instruction_pointer(const struct ftrace_regs *fregs) |
| { |
| return fregs->regs.psw.addr; |
| } |
| |
| static __always_inline void |
| ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, |
| unsigned long ip) |
| { |
| fregs->regs.psw.addr = ip; |
| } |
| |
| #define ftrace_regs_get_argument(fregs, n) \ |
| regs_get_kernel_argument(&(fregs)->regs, n) |
| #define ftrace_regs_get_stack_pointer(fregs) \ |
| kernel_stack_pointer(&(fregs)->regs) |
| #define ftrace_regs_return_value(fregs) \ |
| regs_return_value(&(fregs)->regs) |
| #define ftrace_regs_set_return_value(fregs, ret) \ |
| regs_set_return_value(&(fregs)->regs, ret) |
| #define ftrace_override_function_with_return(fregs) \ |
| override_function_with_return(&(fregs)->regs) |
| #define ftrace_regs_query_register_offset(name) \ |
| regs_query_register_offset(name) |
| |
| #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 = &fregs->regs; |
| regs->orig_gpr2 = addr; |
| } |
| #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ |
| |
| /* |
| * 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 */ |