read msr (IA32_ENERGY_PERF_BIAS)

enasi — Mon, 10 Aug 2015 14:06:22 GMT

I want to read msr register (IA32_ENERGY_PERF_BIAS(1B0H) ) in assembly with "rdmsr" instruction but have a run time error (Segmentation fault (core dumped)).

I execute my code by root.

-------------------- it's my code -----------------

.file "tst.c"

.section .rodata

.LC0:

.string "result %u\n"

.text

.globl main

.type main, @function

main:

.LFB0:

.cfi_startproc

pushq %rbp

.cfi_def_cfa_offset 16

.cfi_offset 6, -16

movq %rsp, %rbp

movq $0,%rax

movq $0,%rdx

movl $0x1b0,%ecx

rdmsr

.cfi_def_cfa_register 6

subq $16, %rsp

movl %ecx, -4(%rbp)

movl $.LC0, %eax

movl -4(%rbp), %edx

movl %edx, %esi

movq %rax, %rdi

movl $0, %eax

call printf

movl $0, %eax

leave

.cfi_def_cfa 7, 8

ret

.cfi_endproc

.LFE0:

.size main, .-main

.ident "GCC: (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3"

.section .note.GNU-stack,"",@progbits

Re: read msr (IA32_ENERGY_PERF_BIAS)

Allan_J_Intel1 — Wed, 26 Aug 2015 21:31:18 GMT

I would recommend searching for assistance at the software developer zone here: https://sfederation.intel.com/affwebservices/public/saml2sso?SPID=idz-prod&ProtocolBinding=urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST&RelayState=https://software%2Eintel%2Ecom/en-us/forum Intel developer Zone Forums

Allan.

topic Re: read msr (IA32_ENERGY_PERF_BIAS) in Mobile and Desktop Processors

read msr (IA32_ENERGY_PERF_BIAS)

Re: read msr (IA32_ENERGY_PERF_BIAS)