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/ptrace.h> 13#include <asm/export.h> 14 15 .section .kprobes.text, "ax" 16 17ENTRY(ftrace_stub) 18 br %r14 19 20#define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE) 21#define STACK_PTREGS (STACK_FRAME_OVERHEAD) 22#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS) 23#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW) 24 25ENTRY(_mcount) 26 br %r14 27 28EXPORT_SYMBOL(_mcount) 29 30ENTRY(ftrace_caller) 31 .globl ftrace_regs_caller 32 .set ftrace_regs_caller,ftrace_caller 33 lgr %r1,%r15 34#ifndef CC_USING_HOTPATCH 35 aghi %r0,MCOUNT_RETURN_FIXUP 36#endif 37 aghi %r15,-STACK_FRAME_SIZE 38 stg %r1,__SF_BACKCHAIN(%r15) 39 stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15) 40 stg %r0,(STACK_PTREGS_PSW+8)(%r15) 41 stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15) 42#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES 43 aghik %r2,%r0,-MCOUNT_INSN_SIZE 44 lgrl %r4,function_trace_op 45 lgrl %r1,ftrace_trace_function 46#else 47 lgr %r2,%r0 48 aghi %r2,-MCOUNT_INSN_SIZE 49 larl %r4,function_trace_op 50 lg %r4,0(%r4) 51 larl %r1,ftrace_trace_function 52 lg %r1,0(%r1) 53#endif 54 lgr %r3,%r14 55 la %r5,STACK_PTREGS(%r15) 56 basr %r14,%r1 57#ifdef CONFIG_FUNCTION_GRAPH_TRACER 58# The j instruction gets runtime patched to a nop instruction. 59# See ftrace_enable_ftrace_graph_caller. 60ENTRY(ftrace_graph_caller) 61 j ftrace_graph_caller_end 62 lg %r2,(STACK_PTREGS_GPRS+14*8)(%r15) 63 lg %r3,(STACK_PTREGS_PSW+8)(%r15) 64 brasl %r14,prepare_ftrace_return 65 stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15) 66ftrace_graph_caller_end: 67 .globl ftrace_graph_caller_end 68#endif 69 lg %r1,(STACK_PTREGS_PSW+8)(%r15) 70 lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15) 71 br %r1 72 73#ifdef CONFIG_FUNCTION_GRAPH_TRACER 74 75ENTRY(return_to_handler) 76 stmg %r2,%r5,32(%r15) 77 lgr %r1,%r15 78 aghi %r15,-STACK_FRAME_OVERHEAD 79 stg %r1,__SF_BACKCHAIN(%r15) 80 brasl %r14,ftrace_return_to_handler 81 aghi %r15,STACK_FRAME_OVERHEAD 82 lgr %r14,%r2 83 lmg %r2,%r5,32(%r15) 84 br %r14 85 86#endif 87