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cosmopolitan/test/libc/runtime/arch_prctl_test.c

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Initial import
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
Change license
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│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
Initial import
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│ │
Change license
2020-12-28 01:18:44 +00:00
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
Initial import
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╚─────────────────────────────────────────────────────────────────────────────*/
Add x86_64-linux-gnu emulator I wanted a tiny scriptable meltdown proof way to run userspace programs and visualize how program execution impacts memory. It helps to explain how things like Actually Portable Executable works. It can show you how the GCC generated code is going about manipulating matrices and more. I didn't feel fully comfortable with Qemu and Bochs because I'm not smart enough to understand them. I wanted something like gVisor but with much stronger levels of assurances. I wanted a single binary that'll run, on all major operating systems with an embedded GPL barrier ZIP filesystem that is tiny enough to transpile to JavaScript and run in browsers too. https://justine.storage.googleapis.com/emulator625.mp4
2020-08-25 11:23:25 +00:00
#include "libc/bits/segmentation.h"
Initial import
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#include "libc/calls/calls.h"
Add x86_64-linux-gnu emulator I wanted a tiny scriptable meltdown proof way to run userspace programs and visualize how program execution impacts memory. It helps to explain how things like Actually Portable Executable works. It can show you how the GCC generated code is going about manipulating matrices and more. I didn't feel fully comfortable with Qemu and Bochs because I'm not smart enough to understand them. I wanted something like gVisor but with much stronger levels of assurances. I wanted a single binary that'll run, on all major operating systems with an embedded GPL barrier ZIP filesystem that is tiny enough to transpile to JavaScript and run in browsers too. https://justine.storage.googleapis.com/emulator625.mp4
2020-08-25 11:23:25 +00:00
#include "libc/dce.h"
Initial import
2020-06-15 14:18:57 +00:00
#include "libc/testlib/testlib.h"
TEST(arch_prctl, fs) {
if (IsLinux() || IsOpenbsd()) {
uint64_t n, x;
x = 0xdeadbeef;
arch_prctl(ARCH_SET_FS, &x);
ASSERT_NE(-1, arch_prctl(ARCH_GET_FS, (intptr_t)&n));
ASSERT_EQ((intptr_t)&x, n);
ASSERT_EQ(0xdeadbeef, fs((int64_t *)0));
}
}
TEST(arch_prctl, pointerRebasingFs) {
if (IsLinux() || IsOpenbsd()) {
unsigned long s[] = {0x0706050403020100, 0x0f0e0d0c0b0a0908};
ASSERT_EQ(0x0706050403020100, s[0]);
ASSERT_EQ(0, arch_prctl(ARCH_SET_FS, 1));
ASSERT_EQ(0x0807060504030201, fs(&s[0]));
ASSERT_EQ(0, arch_prctl(ARCH_SET_FS, 2));
ASSERT_EQ(0x0908070605040302, fs(&s[0]));
intptr_t fs;
ASSERT_EQ(0, arch_prctl(ARCH_GET_FS, &fs));
ASSERT_EQ(2, fs);
}
}
TEST(arch_prctl, gs) {
if (IsLinux()) {
uint64_t n, x;
x = 0xdeadbeef;
arch_prctl(ARCH_SET_GS, &x);
ASSERT_NE(-1, arch_prctl(ARCH_GET_GS, (intptr_t)&n));
ASSERT_EQ((intptr_t)&x, n);
ASSERT_EQ(0xdeadbeef, gs((int64_t *)0));
}
}
TEST(arch_prctl, pointerRebasing) {
if (IsLinux()) {
unsigned long s[] = {0x0706050403020100, 0x0f0e0d0c0b0a0908};
ASSERT_EQ(0x0706050403020100, s[0]);
ASSERT_EQ(0, arch_prctl(ARCH_SET_GS, 1));
ASSERT_EQ(0x0807060504030201, gs(&s[0]));
ASSERT_EQ(0, arch_prctl(ARCH_SET_GS, 2));
ASSERT_EQ(0x0908070605040302, gs(&s[0]));
intptr_t gs;
ASSERT_EQ(0, arch_prctl(ARCH_GET_GS, &gs));
ASSERT_EQ(2, gs);
}
}