File size: 1,193 Bytes
b858fab | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | #include "asm_i386.h"
.data
fpenv: .long 0, 0, 0, 0, 0, 0, 0, 0
.text
.globl C(StartMSRInterval)
C(StartMSRInterval):
movl $0x11,%ecx // read the CESR
.byte 0x0F
.byte 0x32 // RDMSR
andl $0xFE3FFE3F,%eax // stop both counters
.byte 0x0F
.byte 0x30 // WRMSR
movl 4(%esp),%eax // point counter 0 to desired event, with counters
andl $0x3F,%eax // still stopped
movl $0x11,%ecx
.byte 0x0F
.byte 0x30 // WRMSR
movl $0x12,%ecx // set counter 0 to the value 0
subl %eax,%eax
subl %edx,%edx
.byte 0x0F
.byte 0x30 // WRMSR
movl 4(%esp),%eax // restart counter 0 with selected event
andl $0x3F,%eax
subl %edx,%edx
orl $0xC0,%eax
movl $0x11,%ecx // control and event select
.byte 0x0F
.byte 0x30 // WRMSR
ret
.globl C(EndMSRInterval)
C(EndMSRInterval):
movl $0x12,%ecx // counter 0
.byte 0x0F
.byte 0x32 // RDMSR
ret // lower 32 bits of count in %eax
#if 0
.data
Lxxx: .long 0
.text
.globl C(setstackcheck)
C(setstackcheck):
movl %esp,%eax
subl $0x38000,%eax
movl $0x5A5A5A5A,(%eax)
movl %eax,Lxxx
ret
.globl C(dostackcheck)
C(dostackcheck):
movl Lxxx,%edx
movl $0,%eax
cmpl $0x5A5A5A5A,(%edx)
jz qqq
incl %eax
qqq:
ret
#endif
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