74 lines
3.4 KiB
C
74 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/segmentation.h"
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#include "libc/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/testlib/testlib.h"
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TEST(arch_prctl, fs) {
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if (IsLinux() || IsOpenbsd()) {
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uint64_t n, x;
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x = 0xdeadbeef;
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arch_prctl(ARCH_SET_FS, &x);
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ASSERT_NE(-1, arch_prctl(ARCH_GET_FS, (intptr_t)&n));
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ASSERT_EQ((intptr_t)&x, n);
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ASSERT_EQ(0xdeadbeef, fs((int64_t *)0));
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}
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}
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TEST(arch_prctl, pointerRebasingFs) {
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if (IsLinux() || IsOpenbsd()) {
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unsigned long s[] = {0x0706050403020100, 0x0f0e0d0c0b0a0908};
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ASSERT_EQ(0x0706050403020100, s[0]);
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ASSERT_EQ(0, arch_prctl(ARCH_SET_FS, 1));
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ASSERT_EQ(0x0807060504030201, fs(&s[0]));
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ASSERT_EQ(0, arch_prctl(ARCH_SET_FS, 2));
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ASSERT_EQ(0x0908070605040302, fs(&s[0]));
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intptr_t fs;
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ASSERT_EQ(0, arch_prctl(ARCH_GET_FS, &fs));
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ASSERT_EQ(2, fs);
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}
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}
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TEST(arch_prctl, gs) {
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if (IsLinux()) {
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uint64_t n, x;
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x = 0xdeadbeef;
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arch_prctl(ARCH_SET_GS, &x);
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ASSERT_NE(-1, arch_prctl(ARCH_GET_GS, (intptr_t)&n));
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ASSERT_EQ((intptr_t)&x, n);
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ASSERT_EQ(0xdeadbeef, gs((int64_t *)0));
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}
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}
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TEST(arch_prctl, pointerRebasing) {
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if (IsLinux()) {
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unsigned long s[] = {0x0706050403020100, 0x0f0e0d0c0b0a0908};
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ASSERT_EQ(0x0706050403020100, s[0]);
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ASSERT_EQ(0, arch_prctl(ARCH_SET_GS, 1));
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ASSERT_EQ(0x0807060504030201, gs(&s[0]));
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ASSERT_EQ(0, arch_prctl(ARCH_SET_GS, 2));
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ASSERT_EQ(0x0908070605040302, gs(&s[0]));
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intptr_t gs;
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ASSERT_EQ(0, arch_prctl(ARCH_GET_GS, &gs));
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ASSERT_EQ(2, gs);
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}
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}
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