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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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6e042492a2
llvm on s390 has problems with __builtin_return_address(n), with n>0, this results in a somewhat cryptic error message: fatal error: error in backend: Unsupported stack frame traversal count To work around it, use the direct return address directly. This is probably not ideal here, but gets things to compile and should only lead to inferior reporting, not to misbehavior of the generated code. Link: https://bugs.llvm.org/show_bug.cgi?id=41424 Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
/* 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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#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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