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

 
 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#include <asm/ftrace.h>
 
 
 
 
 
 
11
12	.section .kprobes.text, "ax"
13
14ENTRY(ftrace_stub)
15	br	%r14
 
 
 
 
 
 
16
17ENTRY(_mcount)
18#ifdef CONFIG_DYNAMIC_FTRACE
19	br	%r14
 
20
21ENTRY(ftrace_caller)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
22#endif
23	stm	%r2,%r5,16(%r15)
24	bras	%r1,2f
250:	.long	ftrace_trace_function
261:	.long	function_trace_stop
272:	l	%r2,1b-0b(%r1)
28	icm	%r2,0xf,0(%r2)
29	jnz	3f
30	st	%r14,56(%r15)
31	lr	%r0,%r15
32	ahi	%r15,-96
33	l	%r3,100(%r15)
34	la	%r2,0(%r14)
35	st	%r0,__SF_BACKCHAIN(%r15)
36	la	%r3,0(%r3)
37	ahi	%r2,-MCOUNT_INSN_SIZE
38	l	%r14,0b-0b(%r1)
39	l	%r14,0(%r14)
40	basr	%r14,%r14
41#ifdef CONFIG_FUNCTION_GRAPH_TRACER
42	l	%r2,100(%r15)
43	l	%r3,152(%r15)
44ENTRY(ftrace_graph_caller)
45# The bras instruction gets runtime patched to call prepare_ftrace_return.
46# See ftrace_enable_ftrace_graph_caller. The patched instruction is:
47#	bras	%r14,prepare_ftrace_return
48	bras	%r14,0f
490:	st	%r2,100(%r15)
 
 
 
50#endif
51	ahi	%r15,96
52	l	%r14,56(%r15)
533:	lm	%r2,%r5,16(%r15)
54	br	%r14
55
56#ifdef CONFIG_FUNCTION_GRAPH_TRACER
57
58ENTRY(return_to_handler)
59	stm	%r2,%r5,16(%r15)
60	st	%r14,56(%r15)
61	lr	%r0,%r15
62	ahi	%r15,-96
63	st	%r0,__SF_BACKCHAIN(%r15)
64	bras	%r1,0f
65	.long	ftrace_return_to_handler
660:	l	%r2,0b-0b(%r1)
67	basr	%r14,%r2
68	lr	%r14,%r2
69	ahi	%r15,96
70	lm	%r2,%r5,16(%r15)
71	br	%r14
72
73#endif