1 // SPDX-License-Identifier: GPL-2.0+
2
3 /*
4 * Copyright 2018 IBM Corporation.
5 */
6
7 #define __SANE_USERSPACE_TYPES__
8
9 #include <sys/types.h>
10 #include <stdint.h>
11 #include <unistd.h>
12 #include <signal.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <stdio.h>
16 #include <sys/utsname.h>
17 #include "utils.h"
18 #include "flush_utils.h"
19
load(void * addr)20 static inline __u64 load(void *addr)
21 {
22 __u64 tmp;
23
24 asm volatile("ld %0,0(%1)" : "=r"(tmp) : "b"(addr));
25
26 return tmp;
27 }
28
syscall_loop(char * p,unsigned long iterations,unsigned long zero_size)29 void syscall_loop(char *p, unsigned long iterations,
30 unsigned long zero_size)
31 {
32 for (unsigned long i = 0; i < iterations; i++) {
33 for (unsigned long j = 0; j < zero_size; j += CACHELINE_SIZE)
34 load(p + j);
35 getppid();
36 }
37 }
38
syscall_loop_uaccess(char * p,unsigned long iterations,unsigned long zero_size)39 void syscall_loop_uaccess(char *p, unsigned long iterations,
40 unsigned long zero_size)
41 {
42 struct utsname utsname;
43
44 for (unsigned long i = 0; i < iterations; i++) {
45 for (unsigned long j = 0; j < zero_size; j += CACHELINE_SIZE)
46 load(p + j);
47 uname(&utsname);
48 }
49 }
50
sigill_handler(int signr,siginfo_t * info,void * unused)51 static void sigill_handler(int signr, siginfo_t *info, void *unused)
52 {
53 static int warned;
54 ucontext_t *ctx = (ucontext_t *)unused;
55 unsigned long *pc = &UCONTEXT_NIA(ctx);
56
57 /* mtspr 3,RS to check for move to DSCR below */
58 if ((*((unsigned int *)*pc) & 0xfc1fffff) == 0x7c0303a6) {
59 if (!warned++)
60 printf("WARNING: Skipping over dscr setup. Consider running 'ppc64_cpu --dscr=1' manually.\n");
61 *pc += 4;
62 } else {
63 printf("SIGILL at %p\n", pc);
64 abort();
65 }
66 }
67
set_dscr(unsigned long val)68 void set_dscr(unsigned long val)
69 {
70 static int init;
71 struct sigaction sa;
72
73 if (!init) {
74 memset(&sa, 0, sizeof(sa));
75 sa.sa_sigaction = sigill_handler;
76 sa.sa_flags = SA_SIGINFO;
77 if (sigaction(SIGILL, &sa, NULL))
78 perror("sigill_handler");
79 init = 1;
80 }
81
82 asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR));
83 }
84