Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/s390/kernel/mcount.S
10817 views
1
/*

2
 * Copyright IBM Corp. 2008,2009

3
 *

4
 *   Author(s): Heiko Carstens <[email protected]>,

5
 *

6
 */

7


8
#include <asm/asm-offsets.h>

9


10
	.section .kprobes.text, "ax"

11


12
	.globl ftrace_stub

13
ftrace_stub:

14
	br	%r14

15


16
	.globl _mcount

17
_mcount:

18
#ifdef CONFIG_DYNAMIC_FTRACE

19
	br	%r14

20


21
	.globl ftrace_caller

22
ftrace_caller:

23
#endif

24
	stm	%r2,%r5,16(%r15)

25
	bras	%r1,2f

26
0:	.long	ftrace_trace_function

27
1:	.long	function_trace_stop

28
2:	l	%r2,1b-0b(%r1)

29
	icm	%r2,0xf,0(%r2)

30
	jnz	3f

31
	st	%r14,56(%r15)

32
	lr	%r0,%r15

33
	ahi	%r15,-96

34
	l	%r3,100(%r15)

35
	la	%r2,0(%r14)

36
	st	%r0,__SF_BACKCHAIN(%r15)

37
	la	%r3,0(%r3)

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)

44
	.globl	ftrace_graph_caller

45
ftrace_graph_caller:

46
# The bras instruction gets runtime patched to call prepare_ftrace_return.

47
# See ftrace_enable_ftrace_graph_caller. The patched instruction is:

48
#	bras	%r14,prepare_ftrace_return

49
	bras	%r14,0f

50
0:	st	%r2,100(%r15)

51
#endif

52
	ahi	%r15,96

53
	l	%r14,56(%r15)

54
3:	lm	%r2,%r5,16(%r15)

55
	br	%r14

56


57
#ifdef CONFIG_FUNCTION_GRAPH_TRACER

58


59
	.globl	return_to_handler

60
return_to_handler:

61
	stm	%r2,%r5,16(%r15)

62
	st	%r14,56(%r15)

63
	lr	%r0,%r15

64
	ahi	%r15,-96

65
	st	%r0,__SF_BACKCHAIN(%r15)

66
	bras	%r1,0f

67
	.long	ftrace_return_to_handler

68
0:	l	%r2,0b-0b(%r1)

69
	basr	%r14,%r2

70
	lr	%r14,%r2

71
	ahi	%r15,96

72
	lm	%r2,%r5,16(%r15)

73
	br	%r14

74


75
#endif

76


77