68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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void do_fsave ( void* p )
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{
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asm __volatile__("fninit");
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asm __volatile__("fldpi");
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asm __volatile__("fld1");
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asm __volatile__("fldln2");
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asm __volatile__("fsave (%0)" : : "r" (p) : "memory" );
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}
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int isFPLsbs ( int i )
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{
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int q;
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q = 0; if (i == q || i == q+1) return 1;
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q = 10; if (i == q || i == q+1) return 1;
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q = 20; if (i == q || i == q+1) return 1;
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q = 30; if (i == q || i == q+1) return 1;
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q = 40; if (i == q || i == q+1) return 1;
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q = 50; if (i == q || i == q+1) return 1;
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q = 60; if (i == q || i == q+1) return 1;
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q = 70; if (i == q || i == q+1) return 1;
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return 0;
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}
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void show_fpustate ( unsigned char* buf, int hide64to80 )
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{
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int i;
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printf(" 0 ");
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for (i = 0; i < 14; i++)
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printf("%02x ", buf[i]);
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printf("\n");
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printf(" 14 ");
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for (i = 14; i < 28; i++)
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printf("%02x ", buf[i]);
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printf("\n");
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for (i = 0; i < 80; i++) {
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if ((i % 10) == 0)
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printf("%3d ", i+28);
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if (hide64to80 && isFPLsbs(i))
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printf("xx ");
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else
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printf("%02x ", buf[i+28]);
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if (i > 0 && ((i % 10) == 9))
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printf("\n");
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}
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}
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int main ( int argc, char** argv )
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{
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int i;
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unsigned char* buf = malloc(108);
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int xx = argc > 1;
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printf("Re-run with any arg to suppress least-significant\n"
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" 16 bits of FP numbers\n");
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for (i = 0; i < 108; i++)
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buf[i] = 0xAA;
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/* dump FPU state in buf, and show it. */
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do_fsave(buf);
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show_fpustate( buf, xx );
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return 0;
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}
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