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| 4 | * Copyright 2018 IBM Corporation.
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| 5 |
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| 6 |
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| 7 | #define __SANE_USERSPACE_TYPES__
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| 8 |
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| 9 | #include <sys/types.h>
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| 10 | #include <stdint.h>
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| 11 | #include <unistd.h>
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| 12 | #include <signal.h>
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| 13 | #include <stdlib.h>
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| 14 | #include <string.h>
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| 15 | #include <stdio.h>
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| 16 | #include <sys/utsname.h>
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| 17 | #include "reg.h"
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| 18 | #include "utils.h"
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| 19 | #include "flush_utils.h"
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| 20 |
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| 21 | static inline __u64 load(void *addr)
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| 22 | {
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| 23 | __u64 tmp;
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| 24 |
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| 25 | asm volatile("ld %0,0(%1)" : "=r"(tmp) : "b"(addr));
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| 26 |
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| 27 | return tmp;
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| 28 | }
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| 29 |
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| 30 | void syscall_loop(char *p, unsigned long iterations,
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| 31 | unsigned long zero_size)
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| 32 | {
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| 33 | for (unsigned long i = 0; i < iterations; i++) {
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| 34 | for (unsigned long j = 0; j < zero_size; j += CACHELINE_SIZE)
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| 35 | load(p + j);
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| 36 | getppid();
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| 37 | }
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| 38 | }
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| 39 |
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| 40 | void syscall_loop_uaccess(char *p, unsigned long iterations,
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| 41 | unsigned long zero_size)
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| 42 | {
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| 43 | struct utsname utsname;
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| 44 |
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| 45 | for (unsigned long i = 0; i < iterations; i++) {
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| 46 | for (unsigned long j = 0; j < zero_size; j += CACHELINE_SIZE)
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| 47 | load(p + j);
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| 48 | uname(&utsname);
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | static void sigill_handler(int signr, siginfo_t *info, void *unused)
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| 53 | {
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| 54 | static int warned;
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| 55 | ucontext_t *ctx = (ucontext_t *)unused;
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| 56 | unsigned long *pc = &UCONTEXT_NIA(ctx);
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| 57 |
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| 58 |
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| 59 | if ((*((unsigned int *)*pc) & 0xfc1fffff) == 0x7c0303a6) {
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| 60 | if (!warned++)
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| 61 | printf("WARNING: Skipping over dscr setup. Consider running 'ppc64_cpu --dscr=1' manually.\n");
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| 62 | *pc += 4;
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| 63 | } else {
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| 64 | printf("SIGILL at %p\n", pc);
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| 65 | abort();
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| 66 | }
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| 67 | }
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| 68 |
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| 69 | void set_dscr(unsigned long val)
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| 70 | {
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| 71 | static int init;
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| 72 | struct sigaction sa;
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| 73 |
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| 74 | if (!init) {
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| 75 | memset(&sa, 0, sizeof(sa));
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| 76 | sa.sa_sigaction = sigill_handler;
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| 77 | sa.sa_flags = SA_SIGINFO;
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| 78 | if (sigaction(SIGILL, &sa, NULL))
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| 79 | perror("sigill_handler");
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| 80 | init = 1;
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| 81 | }
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| 82 |
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| 83 | mtspr(SPRN_DSCR, val);
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| 84 | }
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