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