99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
#include <com32.h>
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#include <stdarg.h>
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#define NULL ((void *)0)
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int printf(const char *, ...);
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int putchar(int);
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static inline void memset(void *buf, int ch, unsigned int len)
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{
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asm volatile("cld; rep; stosb"
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: "+D" (buf), "+c" (len) : "a" (ch) : "memory");
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}
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static void strcpy(char *dst, const char *src)
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{
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while ( *src )
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*dst++ = *src++;
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*dst = '\0';
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}
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static void printregs(const com32sys_t *r)
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{
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printf("eflags = %08x ds = %04x es = %04x fs = %04x gs = %04x\n"
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"eax = %08x ebx = %08x ecx = %08x edx = %08x\n"
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"ebp = %08x esi = %08x edi = %08x esp = %08x\n",
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r->eflags.l, r->ds, r->es, r->fs, r->gs,
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r->eax.l, r->ebx.l, r->ecx.l, r->edx.l,
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r->ebp.l, r->esi.l, r->edi.l, r->_unused.l);
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}
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int __start(void)
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{
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unsigned int ax,cx,si,t;
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com32sys_t inreg,outreg;
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char *p;
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/* Test null system call */
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inreg.eflags.l = 0xffffffff;
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inreg.eax.l = 0x11110000;
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inreg.ecx.l = 0x22222222;
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inreg.edx.l = 0x33333333;
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inreg.ebx.l = 0x44444444;
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inreg.ebp.l = 0x55555555;
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inreg.esi.l = 0x66666666;
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inreg.edi.l = 0x77777777;
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inreg.ds = 0xaaaa;
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inreg.es = 0xbbbb;
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inreg.fs = 0xcccc;
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inreg.gs = 0xdddd;
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printregs(&inreg);
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__com32.cs_intcall(0x22, &inreg, &outreg);
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printregs(&outreg);
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printf("----\n");
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memset(&inreg, 0, sizeof inreg);
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memset(&outreg, 0, sizeof outreg);
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strcpy(__com32.cs_bounce, "test.txt");
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inreg.eax.w[0] = 0x0006; // Open file
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inreg.esi.w[0] = OFFS(__com32.cs_bounce);
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inreg.es = SEG(__com32.cs_bounce);
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printregs(&inreg);
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__com32.cs_intcall(0x22, &inreg, &outreg);
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printregs(&outreg);
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printf("----\n");
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si = outreg.esi.w[0]; /* File handle */
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cx = outreg.ecx.w[0]; /* Block size */
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ax = outreg.eax.l; /* File length */
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while ( si ) {
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/* We can only read 64K per call */
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t = ( ax > 65536 ) ? 65536/cx : (ax+cx-1)/cx;
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memset(&inreg, 0, sizeof inreg);
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inreg.esi.w[0] = si;
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inreg.ecx.w[0] = t; /* Block count */
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inreg.eax.w[0] = 0x0007; // Read file
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inreg.ebx.w[0] = OFFS(__com32.cs_bounce);
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inreg.es = SEG(__com32.cs_bounce);
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printregs(&inreg);
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__com32.cs_intcall(0x22, &inreg, &outreg);
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printregs(&outreg);
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printf("----\n");
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si = outreg.esi.w[0];
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/* Print the buffer */
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t = (ax < 65536) ? ax : 65536;
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p = __com32.cs_bounce;
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while ( t ) {
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putchar(*p++);
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t--;
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ax--;
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}
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}
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return 0;
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}
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