100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
#ifndef WINELIB
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static char RCSId[] = "$Id: ldtlib.c,v 1.2 1993/07/04 04:04:21 root Exp root $";
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static char Copyright[] = "Copyright Robert J. Amstadt, 1993";
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "autoconf.h"
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#ifdef linux
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#include <linux/unistd.h>
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#include <linux/head.h>
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#include <linux/ldt.h>
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_syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount)
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#endif
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#if defined(__NetBSD__) || defined(__FreeBSD__)
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#include <machine/segments.h>
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extern int i386_get_ldt(int, union descriptor *, int);
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extern int i386_set_ldt(int, union descriptor *, int);
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struct segment_descriptor *
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make_sd(unsigned base, unsigned limit, int contents, int read_exec_only, int seg32, int inpgs)
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{
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static long d[2];
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d[0] = ((base & 0x0000ffff) << 16) |
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(limit & 0x0ffff);
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d[1] = (base & 0xff000000) |
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((base & 0x00ff0000)>>16) |
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(limit & 0xf0000) |
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(contents << 10) |
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((read_exec_only ^ 1) << 9) |
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(seg32 << 22) |
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(inpgs << 23) |
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0xf000;
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return ((struct segment_descriptor *)d);
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}
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#endif
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int
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get_ldt(void *buffer)
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{
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#ifdef linux
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return modify_ldt(0, buffer, 32 * sizeof(struct modify_ldt_ldt_s));
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#endif
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#if defined(__NetBSD__) || defined(__FreeBSD__)
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return i386_get_ldt(0, (union descriptor *)buffer, 32);
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#endif
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}
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int
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set_ldt_entry(int entry, unsigned long base, unsigned int limit,
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int seg_32bit_flag, int contents, int read_only_flag,
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int limit_in_pages_flag)
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{
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#ifdef linux
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struct modify_ldt_ldt_s ldt_info;
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ldt_info.entry_number = entry;
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ldt_info.base_addr = base;
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ldt_info.limit = limit;
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ldt_info.seg_32bit = seg_32bit_flag;
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ldt_info.contents = contents;
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ldt_info.read_exec_only = read_only_flag;
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ldt_info.limit_in_pages = limit_in_pages_flag;
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#ifdef NEW_LDT_STRUCT
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ldt_info.seg_not_present = 0;
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#endif
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return modify_ldt(1, &ldt_info, sizeof(ldt_info));
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#endif
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#if defined(__NetBSD__) || defined(__FreeBSD__)
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struct segment_descriptor *sd;
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int ret;
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#ifdef DEBUG_LDT
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printf("set_ldt_entry: entry=%x base=%x limit=%x%s %s-bit contents=%d %s\n",
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entry, base, limit, limit_in_pages_flag?"-pages":"",
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seg_32bit_flag?"32":"16",
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contents, read_only_flag?"read-only":"");
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#endif
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sd = make_sd(base, limit, contents, read_only_flag, seg_32bit_flag, limit_in_pages_flag);
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ret = i386_set_ldt(entry, (union descriptor *)sd, 1);
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if (ret < 0) {
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perror("i386_set_ldt");
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fprintf(stderr,
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"Did you reconfigure the kernel with \"options USER_LDT\"?\n");
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exit(1);
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}
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return ret;
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#endif
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}
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#endif /* ifndef WINELIB */
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