fxsave.c revision e739ac0589b4fb43561f801c4faba8c1b89f8680 
1
2#include <stdio.h>
3#include <stdlib.h>
4#include "tests/asm.h"
5#include "tests/malloc.h"
6#include <string.h>
7
8const unsigned int vec0[4]
9   = { 0x12345678, 0x11223344, 0x55667788, 0x87654321 };
10
11const unsigned int vec1[4]
12   = { 0xABCDEF01, 0xAABBCCDD, 0xEEFF0011, 0x10FEDCBA };
13
14const unsigned int vecZ[4]
15   = { 0, 0, 0, 0 };
16
17void do_fxsave ( void* p ) {
18   asm __volatile__("fxsave (%0)" : : "r" (p) : "memory" );
19}
20
21void do_fxrstor ( void* p ) {
22   asm __volatile__("fxrstor (%0)" : : "r" (p) : "memory" );
23}
24
25void do_zeroise ( void )
26{
27   asm __volatile__("finit");
28   asm __volatile__(
29    "fldz\n\t"
30    "fldz\n\t"
31    "fldz\n\t"
32    "fldz\n\t"
33    "fldz\n\t"
34    "fldz\n\t"
35    "fldz\n\t"
36    "fldz\n\t"
37    "finit\n");
38   asm __volatile__("movups " VG_SYM(vecZ) ", %xmm0");
39   asm __volatile__("movups " VG_SYM(vecZ) ", %xmm1");
40   asm __volatile__("movups " VG_SYM(vecZ) ", %xmm2");
41   asm __volatile__("movups " VG_SYM(vecZ) ", %xmm3");
42   asm __volatile__("movups " VG_SYM(vecZ) ", %xmm4");
43   asm __volatile__("movups " VG_SYM(vecZ) ", %xmm5");
44   asm __volatile__("movups " VG_SYM(vecZ) ", %xmm6");
45   asm __volatile__("movups " VG_SYM(vecZ) ", %xmm7");
46   asm __volatile__(
47      "pushl $0\n\t"
48      "ldmxcsr 0(%esp)\n\t"
49      "addl $4,%esp\n");
50}
51
52/* set up the FP and SSE state, and then dump it. */
53void do_setup_then_fxsave ( void* p )
54{
55   asm __volatile__("finit");
56   asm __volatile__("fldpi");
57   asm __volatile__("fld1");
58   asm __volatile__("fldln2");
59   asm __volatile__("fldlg2");
60   asm __volatile__("fld %st(3)");
61   asm __volatile__("fld %st(3)");
62   asm __volatile__("movups " VG_SYM(vec0) ", %xmm0");
63   asm __volatile__("movups " VG_SYM(vec1) ", %xmm1");
64   asm __volatile__("xorps %xmm2, %xmm2");
65   asm __volatile__("movaps %xmm2, %xmm3");
66   asm __volatile__("movaps %xmm2, %xmm4");
67   asm __volatile__("movaps %xmm2, %xmm5");
68   asm __volatile__("movaps %xmm2, %xmm6");
69   asm __volatile__("movaps %xmm1, %xmm7");
70   asm __volatile__("xorps %xmm0, %xmm7");
71   do_fxsave (p);
72}
73
74int isFPLsbs ( int i )
75{
76   int q;
77   q = 32; if (i == q || i == q+1) return 1;
78   q = 48; if (i == q || i == q+1) return 1;
79   q = 64; if (i == q || i == q+1) return 1;
80   q = 80; if (i == q || i == q+1) return 1;
81   q = 96; if (i == q || i == q+1) return 1;
82   q = 112; if (i == q || i == q+1) return 1;
83   q = 128; if (i == q || i == q+1) return 1;
84   q = 144; if (i == q || i == q+1) return 1;
85   return 0;
86}
87
88void show ( unsigned char* buf, int xx )
89{
90   int i;
91   for (i = 0; i < 512; i++) {
92      if ((i % 16) == 0)
93         printf("%3d   ", i);
94      if (xx && isFPLsbs(i))
95	 printf("xx ");
96      else
97         printf("%02x ", buf[i]);
98      if (i > 0 && ((i % 16) == 15))
99          printf("\n");
100   }
101}
102
103
104int main ( int argc, char** argv )
105{
106   unsigned char* buf1 = memalign16(512);
107   unsigned char* buf2 = memalign16(512);
108   unsigned char* buf3 = memalign16(512);
109   int xx = argc > 1;
110   printf("Re-run with any arg to suppress least-significant\n"
111          "   16 bits of FP numbers\n");
112   memset(buf1, 0x55, 512);
113   memset(buf2, 0x55, 512);
114   memset(buf3, 0x55, 512);
115
116   /* Load up x87/xmm state and dump it. */
117   do_setup_then_fxsave(buf1);
118   printf("\nBEFORE\n");
119   show(buf1, xx);
120
121   /* Zeroise x87/xmm state and dump it, to show that the
122      regs have been cleared out. */
123   do_zeroise();
124   do_fxsave(buf2);
125   printf("\nZEROED\n");
126   show(buf2, xx);
127
128   /* Reload x87/xmm state from buf1 and dump it in buf3. */
129   do_fxrstor(buf1);
130   do_fxsave(buf3);
131   printf("\nRESTORED\n");
132   show(buf3, xx);
133
134   free(buf1); free(buf2); free(buf3);
135
136   return 0;
137}
138