mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-08 08:26:14 +00:00
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include "tests/asm.h"
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#include "tests/malloc.h"
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#include <string.h>
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const unsigned int vec0[4]
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= { 0x12345678, 0x11223344, 0x55667788, 0x87654321 };
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const unsigned int vec1[4]
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= { 0xABCDEF01, 0xAABBCCDD, 0xEEFF0011, 0x10FEDCBA };
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const unsigned int vecZ[4]
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= { 0, 0, 0, 0 };
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void do_fxsave ( void* p ) {
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asm __volatile__("fxsave (%0)" : : "r" (p) : "memory" );
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}
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void do_fxrstor ( void* p ) {
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asm __volatile__("fxrstor (%0)" : : "r" (p) : "memory" );
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}
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void do_zeroise ( void )
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{
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asm __volatile__("finit");
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asm __volatile__(
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"fldz\n\t"
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"fldz\n\t"
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"fldz\n\t"
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"fldz\n\t"
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"fldz\n\t"
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"fldz\n\t"
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"fldz\n\t"
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"fldz\n\t"
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"finit\n");
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asm __volatile__("movups " VG_SYM(vecZ) ", %xmm0");
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asm __volatile__("movups " VG_SYM(vecZ) ", %xmm1");
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asm __volatile__("movups " VG_SYM(vecZ) ", %xmm2");
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asm __volatile__("movups " VG_SYM(vecZ) ", %xmm3");
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asm __volatile__("movups " VG_SYM(vecZ) ", %xmm4");
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asm __volatile__("movups " VG_SYM(vecZ) ", %xmm5");
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asm __volatile__("movups " VG_SYM(vecZ) ", %xmm6");
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asm __volatile__("movups " VG_SYM(vecZ) ", %xmm7");
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asm __volatile__(
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"pushl $0\n\t"
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"ldmxcsr 0(%esp)\n\t"
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"addl $4,%esp\n");
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}
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/* set up the FP and SSE state, and then dump it. */
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void do_setup_then_fxsave ( void* p )
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{
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asm __volatile__("finit");
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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__("fldlg2");
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asm __volatile__("fld %st(3)");
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asm __volatile__("fld %st(3)");
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asm __volatile__("movups " VG_SYM(vec0) ", %xmm0");
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asm __volatile__("movups " VG_SYM(vec1) ", %xmm1");
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asm __volatile__("xorps %xmm2, %xmm2");
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asm __volatile__("movaps %xmm2, %xmm3");
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asm __volatile__("movaps %xmm2, %xmm4");
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asm __volatile__("movaps %xmm2, %xmm5");
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asm __volatile__("movaps %xmm2, %xmm6");
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asm __volatile__("movaps %xmm1, %xmm7");
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asm __volatile__("xorps %xmm0, %xmm7");
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do_fxsave (p);
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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 = 32; if (i == q || i == q+1) return 1;
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q = 48; if (i == q || i == q+1) return 1;
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q = 64; if (i == q || i == q+1) return 1;
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q = 80; if (i == q || i == q+1) return 1;
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q = 96; if (i == q || i == q+1) return 1;
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q = 112; if (i == q || i == q+1) return 1;
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q = 128; if (i == q || i == q+1) return 1;
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q = 144; if (i == q || i == q+1) return 1;
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return 0;
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}
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void show ( unsigned char* buf, int xx )
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{
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int i;
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for (i = 0; i < 512; i++) {
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if ((i % 16) == 0)
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printf("%3d ", i);
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if (xx && isFPLsbs(i))
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printf("xx ");
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else
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printf("%02x ", buf[i]);
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if (i > 0 && ((i % 16) == 15))
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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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unsigned char* buf1 = memalign16(512);
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unsigned char* buf2 = memalign16(512);
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unsigned char* buf3 = memalign16(512);
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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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memset(buf1, 0x55, 512);
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memset(buf2, 0x55, 512);
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memset(buf3, 0x55, 512);
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/* Load up x87/xmm state and dump it. */
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do_setup_then_fxsave(buf1);
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printf("\nBEFORE\n");
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show(buf1, xx);
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/* Zeroise x87/xmm state and dump it, to show that the
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regs have been cleared out. */
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do_zeroise();
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do_fxsave(buf2);
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printf("\nZEROED\n");
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show(buf2, xx);
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/* Reload x87/xmm state from buf1 and dump it in buf3. */
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do_fxrstor(buf1);
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do_fxsave(buf3);
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printf("\nRESTORED\n");
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show(buf3, xx);
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free(buf1); free(buf2); free(buf3);
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return 0;
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}
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