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products/Sources/formale Sprachen/C/Linux/arch/s390/kernel/   (Linux Kernel Version 6.17.9©)  Datei vom 24.10.2025 mit Größe 4 kB image not shown  

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mcount.S


products/Sources/formale Sprachen/C/Linux/arch/s390/kernel/mcount.S

/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright IBM Corp. 2008, 2009 * */ #include #include #include #include #include #include #define STACK_FRAME_SIZE_PTREGS (STACK_FRAME_OVERHEAD + __PT_SIZE) #define STACK_PTREGS (STACK_FRAME_OVERHEAD) #define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS) #define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW) #define STACK_FRAME_SIZE_FREGS (STACK_FRAME_OVERHEAD + __FTRACE_REGS_SIZE) #define STACK_FREGS (STACK_FRAME_OVERHEAD) #define STACK_FREGS_PTREGS (STACK_FRAME_OVERHEAD + __FTRACE_REGS_PT_REGS) #define STACK_FREGS_PTREGS_GPRS (STACK_FREGS_PTREGS + __PT_GPRS) #define STACK_FREGS_PTREGS_PSW (STACK_FREGS_PTREGS + __PT_PSW) #define STACK_FREGS_PTREGS_ORIG_GPR2 (STACK_FREGS_PTREGS + __PT_ORIG_GPR2) #define STACK_FREGS_PTREGS_FLAGS (STACK_FREGS_PTREGS + __PT_FLAGS) /* packed stack: allocate just enough for r14, r15 and backchain */ #define TRACED_FUNC_FRAME_SIZE 24 #ifdef CONFIG_FUNCTION_TRACER GEN_BR_THUNK %r1 GEN_BR_THUNK %r14 .section .kprobes.text, "ax" SYM_FUNC_START(ftrace_stub) BR_EX %r14 SYM_FUNC_END(ftrace_stub) SYM_CODE_START(ftrace_stub_direct_tramp) lgr %r1, %r0 BR_EX %r1 SYM_CODE_END(ftrace_stub_direct_tramp) .macro ftrace_regs_entry, allregs=0 stg %r14,(__SF_GPRS+8*8)(%r15) # save traced function caller .if \allregs == 1 # save psw mask # don't put any instructions clobbering CC before this point epsw %r1,%r14 risbg %r14,%r1,0,31,32 .endif lgr %r1,%r15 # allocate stack frame for ftrace_caller to contain traced function aghi %r15,-TRACED_FUNC_FRAME_SIZE stg %r1,__SF_BACKCHAIN(%r15) stg %r0,(__SF_GPRS+8*8)(%r15) stg %r15,(__SF_GPRS+9*8)(%r15) # allocate ftrace_regs and stack frame for ftrace_trace_function aghi %r15,-STACK_FRAME_SIZE_FREGS stg %r1,(STACK_FREGS_PTREGS_GPRS+15*8)(%r15) xc STACK_FREGS_PTREGS_ORIG_GPR2(8,%r15),STACK_FREGS_PTREGS_ORIG_GPR2(%r15) .if \allregs == 1 stg %r14,(STACK_FREGS_PTREGS_PSW)(%r15) mvghi STACK_FREGS_PTREGS_FLAGS(%r15),_PIF_FTRACE_FULL_REGS .else xc STACK_FREGS_PTREGS_FLAGS(8,%r15),STACK_FREGS_PTREGS_FLAGS(%r15) .endif lg %r14,(__SF_GPRS+8*8)(%r1) # restore original return address aghi %r1,-TRACED_FUNC_FRAME_SIZE stg %r1,__SF_BACKCHAIN(%r15) stg %r0,(STACK_FREGS_PTREGS_PSW+8)(%r15) stmg %r2,%r14,(STACK_FREGS_PTREGS_GPRS+2*8)(%r15) .endm SYM_CODE_START(ftrace_regs_caller) ftrace_regs_entry 1 j ftrace_common SYM_CODE_END(ftrace_regs_caller) SYM_CODE_START(ftrace_caller) ftrace_regs_entry 0 j ftrace_common SYM_CODE_END(ftrace_caller) SYM_CODE_START(ftrace_common) #ifdef MARCH_HAS_Z196_FEATURES aghik %r2,%r0,-MCOUNT_INSN_SIZE lgrl %r4,function_trace_op lgrl %r1,ftrace_func #else lgr %r2,%r0 aghi %r2,-MCOUNT_INSN_SIZE larl %r4,function_trace_op lg %r4,0(%r4) larl %r1,ftrace_func lg %r1,0(%r1) #endif lgr %r3,%r14 la %r5,STACK_FREGS(%r15) BASR_EX %r14,%r1 lg %r0,(STACK_FREGS_PTREGS_PSW+8)(%r15) #ifdef MARCH_HAS_Z196_FEATURES ltg %r1,STACK_FREGS_PTREGS_ORIG_GPR2(%r15) locgrz %r1,%r0 #else lg %r1,STACK_FREGS_PTREGS_ORIG_GPR2(%r15) ltgr %r1,%r1 jnz 0f lgr %r1,%r0 #endif 0: lmg %r2,%r15,(STACK_FREGS_PTREGS_GPRS+2*8)(%r15) BR_EX %r1 SYM_CODE_END(ftrace_common) #ifdef CONFIG_FUNCTION_GRAPH_TRACER SYM_FUNC_START(return_to_handler) stmg %r2,%r5,32(%r15) lgr %r1,%r15 # allocate ftrace_regs and stack frame for ftrace_return_to_handler aghi %r15,-STACK_FRAME_SIZE_FREGS stg %r1,__SF_BACKCHAIN(%r15) stg %r2,(STACK_FREGS_PTREGS_GPRS+2*8)(%r15) stg %r1,(STACK_FREGS_PTREGS_GPRS+15*8)(%r15) la %r2,STACK_FRAME_OVERHEAD(%r15) brasl %r14,ftrace_return_to_handler aghi %r15,STACK_FRAME_SIZE_FREGS lgr %r14,%r2 lmg %r2,%r5,32(%r15) BR_EX %r14 SYM_FUNC_END(return_to_handler) #endif #endif /* CONFIG_FUNCTION_TRACER */ SYM_CODE_START(ftrace_shared_hotpatch_trampoline_br) lmg %r0,%r1,2(%r1) br %r1 SYM_INNER_LABEL(ftrace_shared_hotpatch_trampoline_br_end, SYM_L_GLOBAL) SYM_CODE_END(ftrace_shared_hotpatch_trampoline_br) #ifdef CONFIG_EXPOLINE SYM_CODE_START(ftrace_shared_hotpatch_trampoline_exrl) lmg %r0,%r1,2(%r1) exrl %r0,0f j . 0: br %r1 SYM_INNER_LABEL(ftrace_shared_hotpatch_trampoline_exrl_end, SYM_L_GLOBAL) SYM_CODE_END(ftrace_shared_hotpatch_trampoline_exrl) #endif /* CONFIG_EXPOLINE */ #ifdef CONFIG_RETHOOK SYM_CODE_START(arch_rethook_trampoline) stg %r14,(__SF_GPRS+8*8)(%r15) lay %r15,-STACK_FRAME_SIZE_PTREGS(%r15) stmg %r0,%r14,STACK_PTREGS_GPRS(%r15) # store original stack pointer in backchain and pt_regs lay %r7,STACK_FRAME_SIZE_PTREGS(%r15) stg %r7,__SF_BACKCHAIN(%r15) stg %r7,STACK_PTREGS_GPRS+(15*8)(%r15) # store full psw epsw %r2,%r3 risbg %r3,%r2,0,31,32 stg %r3,STACK_PTREGS_PSW(%r15) larl %r1,arch_rethook_trampoline stg %r1,STACK_PTREGS_PSW+8(%r15) lay %r2,STACK_PTREGS(%r15) brasl %r14,arch_rethook_trampoline_callback mvc __SF_EMPTY(16,%r7),STACK_PTREGS_PSW(%r15) lmg %r0,%r15,STACK_PTREGS_GPRS(%r15) lpswe __SF_EMPTY(%r15) SYM_CODE_END(arch_rethook_trampoline) #endif /* CONFIG_RETHOOK */

                                                                                                                                                                                                                                                                                                                                                                                                     

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