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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/* 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