1 #include <stdlib.h>
2 #include <string.h>
3 #include <stdio.h>
4 #include <signal.h>
5 #include <unistd.h>
6 #include <sys/mman.h>
7
8 #include "utils.h"
9
10 extern char __start___ex_table[];
11 extern char __stop___ex_table[];
12
13 #if defined(__powerpc64__)
14 #define UCONTEXT_NIA(UC) (UC)->uc_mcontext.gp_regs[PT_NIP]
15 #elif defined(__powerpc__)
16 #define UCONTEXT_NIA(UC) (UC)->uc_mcontext.uc_regs->gregs[PT_NIP]
17 #else
18 #error implement UCONTEXT_NIA
19 #endif
20
21 static void segv_handler(int signr, siginfo_t *info, void *ptr)
22 {
23 ucontext_t *uc = (ucontext_t *)ptr;
24 unsigned long addr = (unsigned long)info->si_addr;
25 unsigned long *ip = &UCONTEXT_NIA(uc);
26 unsigned long *ex_p = (unsigned long *)__start___ex_table;
27
28 while (ex_p < (unsigned long *)__stop___ex_table) {
29 unsigned long insn, fixup;
30
31 insn = *ex_p++;
32 fixup = *ex_p++;
33
34 if (insn == *ip) {
35 *ip = fixup;
36 return;
37 }
38 }
39
40 printf("No exception table match for NIA %lx ADDR %lx\n", *ip, addr);
41 abort();
42 }
43
44 static void setup_segv_handler(void)
45 {
46 struct sigaction action;
47
48 memset(&action, 0, sizeof(action));
49 action.sa_sigaction = segv_handler;
50 action.sa_flags = SA_SIGINFO;
51 sigaction(SIGSEGV, &action, NULL);
52 }
53
54 unsigned long COPY_LOOP(void *to, const void *from, unsigned long size);
55 unsigned long test_copy_tofrom_user_reference(void *to, const void *from, unsigned long size);
56
57 static int total_passed;
58 static int total_failed;
59
60 static void do_one_test(char *dstp, char *srcp, unsigned long len)
61 {
62 unsigned long got, expected;
63
64 got = COPY_LOOP(dstp, srcp, len);
65 expected = test_copy_tofrom_user_reference(dstp, srcp, len);
66
67 if (got != expected) {
68 total_failed++;
69 printf("FAIL from=%p to=%p len=%ld returned %ld, expected %ld\n",
70 srcp, dstp, len, got, expected);
71 //abort();
72 } else
73 total_passed++;
74 }
75
76 //#define MAX_LEN 512
77 #define MAX_LEN 16
78
79 int test_copy_exception(void)
80 {
81 int page_size;
82 static char *p, *q;
83 unsigned long src, dst, len;
84
85 page_size = getpagesize();
86 p = mmap(NULL, page_size * 2, PROT_READ|PROT_WRITE,
87 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
88
89 if (p == MAP_FAILED) {
90 perror("mmap");
91 exit(1);
92 }
93
94 memset(p, 0, page_size);
95
96 setup_segv_handler();
97
98 if (mprotect(p + page_size, page_size, PROT_NONE)) {
99 perror("mprotect");
100 exit(1);
101 }
102
103 q = p + page_size - MAX_LEN;
104
105 for (src = 0; src < MAX_LEN; src++) {
106 for (dst = 0; dst < MAX_LEN; dst++) {
107 for (len = 0; len < MAX_LEN+1; len++) {
108 // printf("from=%p to=%p len=%ld\n", q+dst, q+src, len);
109 do_one_test(q+dst, q+src, len);
110 }
111 }
112 }
113
114 printf("Totals:\n");
115 printf(" Pass: %d\n", total_passed);
116 printf(" Fail: %d\n", total_failed);
117
118 return 0;
119 }
120
121 int main(void)
122 {
123 return test_harness(test_copy_exception, str(COPY_LOOP));
124 }
125
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