85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
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#define _GNU_SOURCE
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#include <stdint.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sched.h>
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#include "kolibri.h"
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int covfd, msrfd;
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uint64_t rdmsr(uint32_t reg)
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{
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uint64_t data;
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if (pread(msrfd, &data, sizeof data, reg) != sizeof data) {
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perror("rdmsr: pread");
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exit(1);
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}
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return data;
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}
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void wrmsr(uint32_t reg, uint64_t data)
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{
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int fd;
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fd = open("/dev/cpu/0/msr", O_WRONLY);
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if (fd < 0) {
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perror("wrmsr: open");
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exit(1);
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}
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if (pwrite(fd, &data, sizeof data, reg) != sizeof data) {
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perror("wrmsr: pwrite");
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exit(1);
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}
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close(fd);
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return;
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}
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void handle_sigtrap() {
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uint64_t from = rdmsr(0x1db);
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uint64_t to = rdmsr(0x1dc);
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if ((from >= (uintptr_t)coverage_begin && from < (uintptr_t)coverage_end) ||
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(to >= (uintptr_t)coverage_begin && to < (uintptr_t)coverage_end)) {
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write(covfd, &from, 8);
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write(covfd, &to, 8);
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}
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wrmsr(0x1d9, 3);
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}
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void trace_lbr_begin() {
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printf("hello from lbr!\n");
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struct sigaction action;
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action.sa_sigaction = &handle_sigtrap;
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action.sa_flags = SA_SIGINFO;
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sigaction(SIGTRAP, &action, NULL);
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cpu_set_t my_set;
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CPU_ZERO(&my_set);
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CPU_SET(0, &my_set);
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sched_setaffinity(0, sizeof(cpu_set_t), &my_set);
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wrmsr(0x1d9, 3);
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msrfd = open("/dev/cpu/0/msr", O_RDONLY);
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if (msrfd < 0) {
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perror("rdmsr: open");
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exit(1);
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}
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covfd = open("coverage", O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
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set_eflags_tf(1);
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}
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void trace_lbr_end() {
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set_eflags_tf(0);
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wrmsr(0x1d9, 0);
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close(msrfd);
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close(covfd);
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}
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