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149 lines
3.2 KiB
149 lines
3.2 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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#include <stdio.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syscall.h>
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#include <linux/unistd.h>
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#include <asm/ldt.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/utsname.h>
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#ifndef __NR_set_thread_area
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# define __NR_set_thread_area 243
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#endif
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#ifndef __NR_get_thread_area
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# define __NR_get_thread_area 244
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#endif
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#ifndef SYS_set_thread_area
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# define SYS_set_thread_area __NR_set_thread_area
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#endif
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#ifndef SYS_get_thread_area
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# define SYS_get_thread_area __NR_get_thread_area
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#endif
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typedef struct {
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unsigned int entry_number;
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unsigned int base_addr;
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unsigned int limit;
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unsigned int seg_32bit:1;
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unsigned int contents:2;
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unsigned int read_exec_only:1;
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unsigned int limit_in_pages:1;
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unsigned int seg_not_present:1;
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unsigned int useable:1;
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}UserDesc;
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# define TLS_GET_GS_REG() \
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({ int __seg; __asm ("movw %%gs, %w0" : "=q" (__seg)); __seg & 0xffff; })
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# define TLS_SET_GS_REG(val) \
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__asm ("movw %w0, %%gs" :: "q" (val))
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# define TLS_GET_FS_REG() \
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({ int __seg; __asm ("movw %%fs, %w0" : "=q" (__seg)); __seg & 0xffff; })
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# define TLS_SET_FS_REG(val) \
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__asm ("movw %w0, %%fs" :: "q" (val))
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typedef struct
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{
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unsigned int d1;
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unsigned int d2;
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}UserInfo;
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int GetVal(unsigned int off)
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{
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__asm("\
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push %edx;\
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mov 8(%ebp), %edx;\
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mov %fs:0x0(%edx), %edx;\
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mov %edx, %eax;\
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pop %edx");
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}
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const unsigned int value1 = 5;
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const unsigned int value2 = 18;
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#define GDT_NUM_OF_ENTRIES 3
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#define GDT_ENTRIES 16
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unsigned int GdtFirstEntry()
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{
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static int first = 0;
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if (first) return first;
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UserDesc thrDescr;
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for (int i=0; i< GDT_ENTRIES; i++)
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{
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thrDescr.entry_number = i;
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int res = syscall(SYS_get_thread_area, &thrDescr);
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if ((res == 0) || (errno != EINVAL))
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{
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first = i;
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return first;
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}
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}
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fprintf(stderr, "First GDT entry is not found\n");
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exit(-1);
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}
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int main (int argc, char *argv[])
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{
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int rc;
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UserDesc tr;
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int res;
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tr.entry_number = GdtFirstEntry();
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res = syscall(SYS_get_thread_area, &tr);
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if (res != 0)
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{
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printf("SYS_get_thread_area failed with error: %s\n", strerror(errno));
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return 0;
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}
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tr.entry_number = (unsigned)-1;
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tr.base_addr = (unsigned int)new UserInfo();
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((UserInfo*)(tr.base_addr))->d1 = value1;
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((UserInfo*)(tr.base_addr))->d2 = value2;
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res = syscall(SYS_set_thread_area, &tr);
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if (res != 0)
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{
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printf("SYS_set_thread_area failed with error: %s\n", strerror(errno));
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return 0;
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}
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TLS_SET_FS_REG((tr.entry_number << 3) + 3);
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if ((GetVal(0) == value1) && (GetVal(4) == value2))
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{
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printf("TEST PASSED\n");
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}
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else
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{
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printf("TEST FAILED\n");
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}
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return 0;
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}
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