1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright IBM Corp. 2008, 2009 4 * 5 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, 6 * 7 */ 8 9#include <linux/linkage.h> 10#include <asm/asm-offsets.h> 11#include <asm/ftrace.h> 12#include <asm/nospec-insn.h> 13#include <asm/ptrace.h> 14#include <asm/export.h> 15 16 GEN_BR_THUNK %r1 17 GEN_BR_THUNK %r14 18 19 .section .kprobes.text, "ax" 20 21ENTRY(ftrace_stub) 22 BR_EX %r14 23ENDPROC(ftrace_stub) 24 25#define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE) 26#define STACK_PTREGS (STACK_FRAME_OVERHEAD) 27#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS) 28#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW) 29 30ENTRY(_mcount) 31 BR_EX %r14 32ENDPROC(_mcount) 33EXPORT_SYMBOL(_mcount) 34 35ENTRY(ftrace_caller) 36 .globl ftrace_regs_caller 37 .set ftrace_regs_caller,ftrace_caller 38 lgr %r1,%r15 39#if !(defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)) 40 aghi %r0,MCOUNT_RETURN_FIXUP 41#endif 42 aghi %r15,-STACK_FRAME_SIZE 43 stg %r1,__SF_BACKCHAIN(%r15) 44 stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15) 45 stg %r0,(STACK_PTREGS_PSW+8)(%r15) 46 stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15) 47#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES 48 aghik %r2,%r0,-MCOUNT_INSN_SIZE 49 lgrl %r4,function_trace_op 50 lgrl %r1,ftrace_trace_function 51#else 52 lgr %r2,%r0 53 aghi %r2,-MCOUNT_INSN_SIZE 54 larl %r4,function_trace_op 55 lg %r4,0(%r4) 56 larl %r1,ftrace_trace_function 57 lg %r1,0(%r1) 58#endif 59 lgr %r3,%r14 60 la %r5,STACK_PTREGS(%r15) 61 BASR_EX %r14,%r1 62#ifdef CONFIG_FUNCTION_GRAPH_TRACER 63# The j instruction gets runtime patched to a nop instruction. 64# See ftrace_enable_ftrace_graph_caller. 65 .globl ftrace_graph_caller 66ftrace_graph_caller: 67 j ftrace_graph_caller_end 68 lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15) 69 lg %r4,(STACK_PTREGS_PSW+8)(%r15) 70 brasl %r14,prepare_ftrace_return 71 stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15) 72ftrace_graph_caller_end: 73 .globl ftrace_graph_caller_end 74#endif 75 lg %r1,(STACK_PTREGS_PSW+8)(%r15) 76 lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15) 77 BR_EX %r1 78ENDPROC(ftrace_caller) 79 80#ifdef CONFIG_FUNCTION_GRAPH_TRACER 81 82ENTRY(return_to_handler) 83 stmg %r2,%r5,32(%r15) 84 lgr %r1,%r15 85 aghi %r15,-STACK_FRAME_OVERHEAD 86 stg %r1,__SF_BACKCHAIN(%r15) 87 brasl %r14,ftrace_return_to_handler 88 aghi %r15,STACK_FRAME_OVERHEAD 89 lgr %r14,%r2 90 lmg %r2,%r5,32(%r15) 91 BR_EX %r14 92ENDPROC(return_to_handler) 93 94#endif 95