sparcv9cap.c revision 296341 
1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4#include <setjmp.h>
5#include <signal.h>
6#include <sys/time.h>
7#include <openssl/bn.h>
8
9#define SPARCV9_TICK_PRIVILEGED (1<<0)
10#define SPARCV9_PREFER_FPU      (1<<1)
11#define SPARCV9_VIS1            (1<<2)
12#define SPARCV9_VIS2            (1<<3) /* reserved */
13#define SPARCV9_FMADD           (1<<4) /* reserved for SPARC64 V */
14
15static int OPENSSL_sparcv9cap_P = SPARCV9_TICK_PRIVILEGED;
16
17int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
18                const BN_ULONG *np, const BN_ULONG *n0, int num)
19{
20    int bn_mul_mont_fpu(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
21                        const BN_ULONG *np, const BN_ULONG *n0, int num);
22    int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
23                        const BN_ULONG *np, const BN_ULONG *n0, int num);
24
25    if (num >= 8 && !(num & 1) &&
26        (OPENSSL_sparcv9cap_P & (SPARCV9_PREFER_FPU | SPARCV9_VIS1)) ==
27        (SPARCV9_PREFER_FPU | SPARCV9_VIS1))
28        return bn_mul_mont_fpu(rp, ap, bp, np, n0, num);
29    else
30        return bn_mul_mont_int(rp, ap, bp, np, n0, num);
31}
32
33unsigned long _sparcv9_rdtick(void);
34void _sparcv9_vis1_probe(void);
35unsigned long _sparcv9_vis1_instrument(void);
36void _sparcv9_vis2_probe(void);
37void _sparcv9_fmadd_probe(void);
38
39unsigned long OPENSSL_rdtsc(void)
40{
41    if (OPENSSL_sparcv9cap_P & SPARCV9_TICK_PRIVILEGED)
42#if defined(__sun) && defined(__SVR4)
43        return gethrtime();
44#else
45        return 0;
46#endif
47    else
48        return _sparcv9_rdtick();
49}
50
51#if 0 && defined(__sun) && defined(__SVR4)
52/*
53 * This code path is disabled, because of incompatibility of libdevinfo.so.1
54 * and libmalloc.so.1 (see below for details)
55 */
56# include <malloc.h>
57# include <dlfcn.h>
58# include <libdevinfo.h>
59# include <sys/systeminfo.h>
60
61typedef di_node_t(*di_init_t) (const char *, uint_t);
62typedef void (*di_fini_t) (di_node_t);
63typedef char *(*di_node_name_t) (di_node_t);
64typedef int (*di_walk_node_t) (di_node_t, uint_t, di_node_name_t,
65                               int (*)(di_node_t, di_node_name_t));
66
67# define DLLINK(h,name) (name=(name##_t)dlsym((h),#name))
68
69static int walk_nodename(di_node_t node, di_node_name_t di_node_name)
70{
71    char *name = (*di_node_name) (node);
72
73    /* This is expected to catch all UltraSPARC flavors prior T1 */
74    if (!strcmp(name, "SUNW,UltraSPARC") ||
75        /* covers II,III,IV */
76        !strncmp(name, "SUNW,UltraSPARC-I", 17)) {
77        OPENSSL_sparcv9cap_P |= SPARCV9_PREFER_FPU | SPARCV9_VIS1;
78
79        /* %tick is privileged only on UltraSPARC-I/II, but not IIe */
80        if (name[14] != '\0' && name[17] != '\0' && name[18] != '\0')
81            OPENSSL_sparcv9cap_P &= ~SPARCV9_TICK_PRIVILEGED;
82
83        return DI_WALK_TERMINATE;
84    }
85    /* This is expected to catch remaining UltraSPARCs, such as T1 */
86    else if (!strncmp(name, "SUNW,UltraSPARC", 15)) {
87        OPENSSL_sparcv9cap_P &= ~SPARCV9_TICK_PRIVILEGED;
88
89        return DI_WALK_TERMINATE;
90    }
91
92    return DI_WALK_CONTINUE;
93}
94
95void OPENSSL_cpuid_setup(void)
96{
97    void *h;
98    char *e, si[256];
99    static int trigger = 0;
100
101    if (trigger)
102        return;
103    trigger = 1;
104
105    if ((e = getenv("OPENSSL_sparcv9cap"))) {
106        OPENSSL_sparcv9cap_P = strtoul(e, NULL, 0);
107        return;
108    }
109
110    if (sysinfo(SI_MACHINE, si, sizeof(si)) > 0) {
111        if (strcmp(si, "sun4v"))
112            /* FPU is preferred for all CPUs, but US-T1/2 */
113            OPENSSL_sparcv9cap_P |= SPARCV9_PREFER_FPU;
114    }
115
116    if (sysinfo(SI_ISALIST, si, sizeof(si)) > 0) {
117        if (strstr(si, "+vis"))
118            OPENSSL_sparcv9cap_P |= SPARCV9_VIS1;
119        if (strstr(si, "+vis2")) {
120            OPENSSL_sparcv9cap_P |= SPARCV9_VIS2;
121            OPENSSL_sparcv9cap_P &= ~SPARCV9_TICK_PRIVILEGED;
122            return;
123        }
124    }
125# ifdef M_KEEP
126    /*
127     * Solaris libdevinfo.so.1 is effectively incomatible with
128     * libmalloc.so.1. Specifically, if application is linked with
129     * -lmalloc, it crashes upon startup with SIGSEGV in
130     * free(3LIBMALLOC) called by di_fini. Prior call to
131     * mallopt(M_KEEP,0) somehow helps... But not always...
132     */
133    if ((h = dlopen(NULL, RTLD_LAZY))) {
134        union {
135            void *p;
136            int (*f) (int, int);
137        } sym;
138        if ((sym.p = dlsym(h, "mallopt")))
139            (*sym.f) (M_KEEP, 0);
140        dlclose(h);
141    }
142# endif
143    if ((h = dlopen("libdevinfo.so.1", RTLD_LAZY)))
144        do {
145            di_init_t di_init;
146            di_fini_t di_fini;
147            di_walk_node_t di_walk_node;
148            di_node_name_t di_node_name;
149            di_node_t root_node;
150
151            if (!DLLINK(h, di_init))
152                break;
153            if (!DLLINK(h, di_fini))
154                break;
155            if (!DLLINK(h, di_walk_node))
156                break;
157            if (!DLLINK(h, di_node_name))
158                break;
159
160            if ((root_node = (*di_init) ("/", DINFOSUBTREE)) != DI_NODE_NIL) {
161                (*di_walk_node) (root_node, DI_WALK_SIBFIRST,
162                                 di_node_name, walk_nodename);
163                (*di_fini) (root_node);
164            }
165        } while (0);
166
167    if (h)
168        dlclose(h);
169}
170
171#else
172
173static sigjmp_buf common_jmp;
174static void common_handler(int sig)
175{
176    siglongjmp(common_jmp, sig);
177}
178
179void OPENSSL_cpuid_setup(void)
180{
181    char *e;
182    struct sigaction common_act, ill_oact, bus_oact;
183    sigset_t all_masked, oset;
184    static int trigger = 0;
185
186    if (trigger)
187        return;
188    trigger = 1;
189
190    if ((e = getenv("OPENSSL_sparcv9cap"))) {
191        OPENSSL_sparcv9cap_P = strtoul(e, NULL, 0);
192        return;
193    }
194
195    /* Initial value, fits UltraSPARC-I&II... */
196    OPENSSL_sparcv9cap_P = SPARCV9_PREFER_FPU | SPARCV9_TICK_PRIVILEGED;
197
198    sigfillset(&all_masked);
199    sigdelset(&all_masked, SIGILL);
200    sigdelset(&all_masked, SIGTRAP);
201# ifdef SIGEMT
202    sigdelset(&all_masked, SIGEMT);
203# endif
204    sigdelset(&all_masked, SIGFPE);
205    sigdelset(&all_masked, SIGBUS);
206    sigdelset(&all_masked, SIGSEGV);
207    sigprocmask(SIG_SETMASK, &all_masked, &oset);
208
209    memset(&common_act, 0, sizeof(common_act));
210    common_act.sa_handler = common_handler;
211    common_act.sa_mask = all_masked;
212
213    sigaction(SIGILL, &common_act, &ill_oact);
214    sigaction(SIGBUS, &common_act, &bus_oact); /* T1 fails 16-bit ldda [on
215                                                * Linux] */
216
217    if (sigsetjmp(common_jmp, 1) == 0) {
218        _sparcv9_rdtick();
219        OPENSSL_sparcv9cap_P &= ~SPARCV9_TICK_PRIVILEGED;
220    }
221
222    if (sigsetjmp(common_jmp, 1) == 0) {
223        _sparcv9_vis1_probe();
224        OPENSSL_sparcv9cap_P |= SPARCV9_VIS1;
225        /* detect UltraSPARC-Tx, see sparccpud.S for details... */
226        if (_sparcv9_vis1_instrument() >= 12)
227            OPENSSL_sparcv9cap_P &= ~(SPARCV9_VIS1 | SPARCV9_PREFER_FPU);
228        else {
229            _sparcv9_vis2_probe();
230            OPENSSL_sparcv9cap_P |= SPARCV9_VIS2;
231        }
232    }
233
234    if (sigsetjmp(common_jmp, 1) == 0) {
235        _sparcv9_fmadd_probe();
236        OPENSSL_sparcv9cap_P |= SPARCV9_FMADD;
237    }
238
239    sigaction(SIGBUS, &bus_oact, NULL);
240    sigaction(SIGILL, &ill_oact, NULL);
241
242    sigprocmask(SIG_SETMASK, &oset, NULL);
243}
244
245#endif
246