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Matheus
e4a4896b4b
Implement a device (/dev/kcov) that exposes coverage info for the kernel. This will be especially useful for coverage-based fuzzing (e.g. syzkaller). Exclude a lot of functions which would crash/otherwise interfere in the coverage, including only processing coverage callbacks when not handling an irq.
37 lines
971 B
C
37 lines
971 B
C
#ifndef _MSR_H
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#define _MSR_H
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#include <stdint.h>
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#include <kernel/kcov.h>
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#define MSR_IA32APICBASE 0x1B
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#define MSR_PERF_FIXED_CTR2 0x30b
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#define MSR_PERF_FIXED_CTR_CTRL 0x38d
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#define MSR_PERF_GLOBAL_STATUS 0x38e
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#define MSR_PERF_GLOBAL_CTRL 0x38f
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#define MSR_PERF_GLOBAL_OVF_CTRL 0x390
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#define MSR_EFER 0xC0000080
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#define MSR_STAR 0xC0000081
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#define MSR_LSTAR 0xC0000082
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#define MSR_CSTAR 0xC0000083
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#define MSR_FMASK 0xC0000084
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#define MSR_FSBASE 0xC0000100
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#define MSR_GSBASE 0xC0000101
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#define MSR_KERNELGSBASE 0xC0000102
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#define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
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KCOV_DISABLED static inline uint64_t rdmsr(uint32_t which) {
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uint64_t low,high;
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asm volatile("rdmsr" : "=a"(low), "=d"(high) : "c"(which));
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return (high << 32) | low;
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}
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KCOV_DISABLED static inline void wrmsr(uint32_t which, uint64_t value) {
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uint32_t low = value & 0xFFFFFFFF;
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uint32_t high = (value >> 32) & 0xFFFFFFFF;
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asm volatile("wrmsr" : : "a"(low), "d"(high), "c"(which));
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}
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#endif
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