118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_S390_FTRACE_H
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#define _ASM_S390_FTRACE_H
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#define ARCH_SUPPORTS_FTRACE_OPS 1
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#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
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#define MCOUNT_INSN_SIZE 6
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#else
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#define MCOUNT_INSN_SIZE 24
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#define MCOUNT_RETURN_FIXUP 18
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#endif
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#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_CC_IS_CLANG
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/* https://bugs.llvm.org/show_bug.cgi?id=41424 */
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#define ftrace_return_address(n) 0UL
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#else
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#define ftrace_return_address(n) __builtin_return_address(n)
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#endif
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void _mcount(void);
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void ftrace_caller(void);
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extern char ftrace_graph_caller_end;
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extern unsigned long ftrace_plt;
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struct dyn_arch_ftrace { };
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#define MCOUNT_ADDR ((unsigned long)_mcount)
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#define FTRACE_ADDR ((unsigned long)ftrace_caller)
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#define KPROBE_ON_FTRACE_NOP 0
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#define KPROBE_ON_FTRACE_CALL 1
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static inline unsigned long ftrace_call_adjust(unsigned long addr)
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{
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return addr;
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}
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struct ftrace_insn {
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u16 opc;
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s32 disp;
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} __packed;
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static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
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{
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#ifdef CONFIG_FUNCTION_TRACER
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#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
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/* brcl 0,0 */
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insn->opc = 0xc004;
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insn->disp = 0;
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#else
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/* jg .+24 */
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insn->opc = 0xc0f4;
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insn->disp = MCOUNT_INSN_SIZE / 2;
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#endif
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#endif
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}
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static inline int is_ftrace_nop(struct ftrace_insn *insn)
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{
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#ifdef CONFIG_FUNCTION_TRACER
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#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
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if (insn->disp == 0)
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return 1;
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#else
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if (insn->disp == MCOUNT_INSN_SIZE / 2)
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return 1;
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#endif
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#endif
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return 0;
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}
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static inline void ftrace_generate_call_insn(struct ftrace_insn *insn,
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unsigned long ip)
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{
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#ifdef CONFIG_FUNCTION_TRACER
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unsigned long target;
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/* brasl r0,ftrace_caller */
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target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR;
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insn->opc = 0xc005;
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insn->disp = (target - ip) / 2;
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#endif
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}
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/*
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* Even though the system call numbers are identical for s390/s390x a
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* different system call table is used for compat tasks. This may lead
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* to e.g. incorrect or missing trace event sysfs files.
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* Therefore simply do not trace compat system calls at all.
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* See kernel/trace/trace_syscalls.c.
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*/
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#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
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static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
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{
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return is_compat_task();
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}
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#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
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static inline bool arch_syscall_match_sym_name(const char *sym,
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const char *name)
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{
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/*
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* Skip __s390_ and __s390x_ prefix - due to compat wrappers
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* and aliasing some symbols of 64 bit system call functions
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* may get the __s390_ prefix instead of the __s390x_ prefix.
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*/
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return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
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}
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_S390_FTRACE_H */
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