1 /* $OpenBSD: simm13.c,v 1.6 2014/04/18 14:38:21 guenther Exp $ */
2
3 /*
4 * Copyright (c) 2003 Jason L. Wright (jason@thought.net)
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /*
30 * check that "popc immediate, %rd" gets the correct value. It is
31 * emulated on most SPARC v9 implementations.
32 */
33
34 #include <sys/types.h>
35 #include <sys/mman.h>
36 #include <machine/instr.h>
37 #include <err.h>
38 #include <stdio.h>
39
40 #define SIGN_EXT13(v) (((int64_t)(v) << 51) >> 51)
41
42 void gen_simm(u_int32_t *, int);
43 int64_t a_popc_imm(void *, int);
44 int64_t c_popc(int64_t);
45 int main(void);
46
47 void
gen_simm(u_int32_t * p,int imm)48 gen_simm(u_int32_t *p, int imm)
49 {
50 /*
51 * generate the following asm, and flush the pipeline
52 * retl
53 * popc imm, %o0
54 */
55 p[0] = I_JMPLri(I_G0, I_O7, 8);
56 __asm volatile("iflush %0+0" : : "r" (p + 0));
57 p[1] = _I_OP3_R_RI(I_O0, IOP3_POPC, I_G0, imm);
58 __asm volatile("iflush %0+0" : : "r" (p + 1));
59 __asm volatile("nop;nop;nop;nop;nop");
60 }
61
62 int64_t
a_popc_imm(void * v,int i)63 a_popc_imm(void *v, int i)
64 {
65 int64_t (*func)(void) = v, r;
66
67 if (mprotect(v, 2 * sizeof(union instr), PROT_READ|PROT_WRITE) == -1)
68 err(1, "mprotect");
69 gen_simm(v, i);
70
71 if (mprotect(v, 2 * sizeof(union instr), PROT_READ|PROT_EXEC) == -1)
72 err(1, "mprotect");
73 r = (*func)();
74
75 if (mprotect(v, 2 * sizeof(union instr), PROT_NONE) == -1)
76 err(1, "mprotect");
77
78 return (r);
79 }
80
81 int64_t
c_popc(int64_t v)82 c_popc(int64_t v)
83 {
84 int64_t bit, r;
85
86 for (bit = 1, r = 0; bit; bit <<= 1)
87 if (v & bit)
88 r++;
89 return (r);
90 }
91
92 int
main()93 main()
94 {
95 void *v;
96 int i, a, c;
97 int r = 0;
98
99 v = mmap(NULL, 2 * sizeof(union instr), PROT_NONE, MAP_ANON, -1, 0);
100 if (v == MAP_FAILED)
101 err(1, "mmap");
102
103 for (i = -4096; i <= 4095; i++) {
104 a = a_popc_imm(v, i);
105 c = c_popc(SIGN_EXT13(i));
106 if (c != a) {
107 printf("BAD: %d: asm %d, c %d\n", i, a, c);
108 r = 1;
109 }
110 }
111
112 return (r);
113 }
114