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
23
24#define STACK_FRAME_SIZE  (STACK_FRAME_OVERHEAD + __PT_SIZE)
25#define STACK_PTREGS	  (STACK_FRAME_OVERHEAD)
26#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
27#define STACK_PTREGS_PSW  (STACK_PTREGS + __PT_PSW)
28
29ENTRY(_mcount)
30	BR_EX	%r14
31
32EXPORT_SYMBOL(_mcount)
33
34ENTRY(ftrace_caller)
35	.globl	ftrace_regs_caller
36	.set	ftrace_regs_caller,ftrace_caller
37	lgr	%r1,%r15
38#ifndef CC_USING_HOTPATCH
39	aghi	%r0,MCOUNT_RETURN_FIXUP
40#endif
41	aghi	%r15,-STACK_FRAME_SIZE
42	stg	%r1,__SF_BACKCHAIN(%r15)
43	stg	%r1,(STACK_PTREGS_GPRS+15*8)(%r15)
44	stg	%r0,(STACK_PTREGS_PSW+8)(%r15)
45	stmg	%r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
46#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
47	aghik	%r2,%r0,-MCOUNT_INSN_SIZE
48	lgrl	%r4,function_trace_op
49	lgrl	%r1,ftrace_trace_function
50#else
51	lgr	%r2,%r0
52	aghi	%r2,-MCOUNT_INSN_SIZE
53	larl	%r4,function_trace_op
54	lg	%r4,0(%r4)
55	larl	%r1,ftrace_trace_function
56	lg	%r1,0(%r1)
57#endif
58	lgr	%r3,%r14
59	la	%r5,STACK_PTREGS(%r15)
60	BASR_EX	%r14,%r1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
61#ifdef CONFIG_FUNCTION_GRAPH_TRACER
62# The j instruction gets runtime patched to a nop instruction.
63# See ftrace_enable_ftrace_graph_caller.
64ENTRY(ftrace_graph_caller)
65	j	ftrace_graph_caller_end
66	lg	%r2,(STACK_PTREGS_GPRS+14*8)(%r15)
67	lg	%r3,(STACK_PTREGS_PSW+8)(%r15)
68	brasl	%r14,prepare_ftrace_return
69	stg	%r2,(STACK_PTREGS_GPRS+14*8)(%r15)
70ftrace_graph_caller_end:
71	.globl	ftrace_graph_caller_end
72#endif
73	lg	%r1,(STACK_PTREGS_PSW+8)(%r15)
74	lmg	%r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
75	BR_EX	%r1
 
76
77#ifdef CONFIG_FUNCTION_GRAPH_TRACER
78
79ENTRY(return_to_handler)
80	stmg	%r2,%r5,32(%r15)
81	lgr	%r1,%r15
82	aghi	%r15,-STACK_FRAME_OVERHEAD
83	stg	%r1,__SF_BACKCHAIN(%r15)
84	brasl	%r14,ftrace_return_to_handler
85	aghi	%r15,STACK_FRAME_OVERHEAD
86	lgr	%r14,%r2
87	lmg	%r2,%r5,32(%r15)
88	BR_EX	%r14
 
 
 
 
89
90#endif

 
 1/*
 2 * Copyright IBM Corp. 2008,2009
 3 *
 4 *   Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
 5 *
 6 */
 7
 8#include <linux/linkage.h>
 9#include <asm/asm-offsets.h>
 
 
 
 
 
 
 
10
11	.section .kprobes.text, "ax"
12
13ENTRY(ftrace_stub)
14	br	%r14
 
 
 
 
 
15
16ENTRY(_mcount)
17#ifdef CONFIG_DYNAMIC_FTRACE
18	br	%r14
 
19
20ENTRY(ftrace_caller)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
21#endif
22	stm	%r2,%r5,16(%r15)
23	bras	%r1,2f
240:	.long	ftrace_trace_function
251:	.long	function_trace_stop
262:	l	%r2,1b-0b(%r1)
27	icm	%r2,0xf,0(%r2)
28	jnz	3f
29	st	%r14,56(%r15)
30	lr	%r0,%r15
31	ahi	%r15,-96
32	l	%r3,100(%r15)
33	la	%r2,0(%r14)
34	st	%r0,__SF_BACKCHAIN(%r15)
35	la	%r3,0(%r3)
36	l	%r14,0b-0b(%r1)
37	l	%r14,0(%r14)
38	basr	%r14,%r14
39#ifdef CONFIG_FUNCTION_GRAPH_TRACER
40	l	%r2,100(%r15)
41	l	%r3,152(%r15)
42ENTRY(ftrace_graph_caller)
43# The bras instruction gets runtime patched to call prepare_ftrace_return.
44# See ftrace_enable_ftrace_graph_caller. The patched instruction is:
45#	bras	%r14,prepare_ftrace_return
46	bras	%r14,0f
470:	st	%r2,100(%r15)
 
 
48#endif
49	ahi	%r15,96
50	l	%r14,56(%r15)
513:	lm	%r2,%r5,16(%r15)
52	br	%r14
53
54#ifdef CONFIG_FUNCTION_GRAPH_TRACER
55
56ENTRY(return_to_handler)
57	stm	%r2,%r5,16(%r15)
58	st	%r14,56(%r15)
59	lr	%r0,%r15
60	ahi	%r15,-96
61	st	%r0,__SF_BACKCHAIN(%r15)
62	bras	%r1,0f
63	.long	ftrace_return_to_handler
640:	l	%r2,0b-0b(%r1)
65	basr	%r14,%r2
66	lr	%r14,%r2
67	ahi	%r15,96
68	lm	%r2,%r5,16(%r15)
69	br	%r14
70
71#endif