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https://github.com/jart/cosmopolitan.git
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f4f4caab0e
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
118 lines
5.4 KiB
C
118 lines
5.4 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/runtime/gc.h"
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#include "libc/testlib/ezbench.h"
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#include "libc/testlib/testlib.h"
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#include "test/libc/xed/lib.h"
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#include "third_party/xed/x86.h"
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/**
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* @fileoverview Instruction Length Decoding Tests.
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*
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* It is demonstrated that our 3.5kb x86 parser supports all legal x86
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* instruction set architectures and addressing modes since the 1970's,
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* including the really sophisticated ones, e.g. avx512, as well as the
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* less popular ones, e.g. 3dnow.
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*/
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TEST(x86ild, testSomeThingsNeverChange) {
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ASSERT_EQ(3, ildreal(u"â└↨")); /* add $23,%ax */
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ASSERT_EQ(3, ildlegacy(u"â└↨")); /* add $23,%eax */
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ASSERT_EQ(3, ild(u"â└↨")); /* add $23,%eax */
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}
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TEST(x86ild, testSomeThingsDoChange) {
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ASSERT_EQ(3, ildreal(u"♣7‼ÉÉ")); /* add $0x1337,%ax */
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ASSERT_EQ(5, ildlegacy(u"♣7‼ÉÉ")); /* add $0x90901337,%eax */
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ASSERT_EQ(5, ild(u"♣7‼ÉÉ")); /* add $0x90901337,%eax */
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ASSERT_EQ(1, ildreal(u"@É")); /* inc %ax */
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ASSERT_EQ(1, ildlegacy(u"@É")); /* inc %eax */
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ASSERT_EQ(2, ild(u"@É")); /* rex xchg %eax,%eax */
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}
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TEST(x86ild, testHugeInstructions) {
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ASSERT_EQ(10, ild(u"H║ Ç")); /* movabs $0x8000000000000000,%rdx */
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ASSERT_EQ(11, ild(u"H╟♣8l É ")); /* movq $0x209000,0x6c38(%rip) */
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ASSERT_EQ(12, ild(u"H╟ä$á ")); /* movq $0x0,0xa0(%rsp) */
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}
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TEST(x86ild, testLaughOutLoudLargeCanonicalInstructions) {
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ASSERT_EQ(15, /* lock addl $0x12331337,%fs:-0x1337(%ebx,%esi,1) */
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ildreal(u"≡dfgüä3╔∞λλ7‼3↕"));
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}
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TEST(x86ild, testEncodingDisagreements) {
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ASSERT_EQ(13, /* lock addw $0x1337,%fs:-0x1337(%ebx,%esi,1) */
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ild(u"fg≡düä3╔∞λλ7‼")); /* ← xed encoding */
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ASSERT_EQ(13, /* lock addw $0x1337,%fs:-0x1337(%ebx,%esi,1) */
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ild(u"dgf≡üä3╔∞λλ7‼")); /* ← gas encoding */
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}
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TEST(x86ild, testOverlongInstructions) {
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ASSERT_EQ(3, ild(u"≤≤É")); /* rep pause */
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ASSERT_EQ(-XED_ERROR_BUFFER_TOO_SHORT /* suboptimal error code */,
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ildreal(u"≡≡≡≡dfgüä3╔∞λλ7‼3↕"));
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}
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TEST(x86ild, testAvx512_inRealMode_throwsError) {
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ASSERT_EQ(-XED_ERROR_INVALID_MODE, ildreal(u"bßTXYö∟¶♦ "));
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}
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TEST(x86ild, testAvx512) {
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ASSERT_EQ(6, /* vaddps %zmm17,%zmm16,%zmm16 */
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ild(u"b¡|@X┴"));
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ASSERT_EQ(11, /* vmulps 0x414(%rsp,%rbx,1){1to16},%zmm5,%zmm18 */
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ild(u"bßTXYö∟¶♦ "));
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}
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TEST(x86ild, testCascadeLake_advancedNeuralNetworkInstructions) {
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ASSERT_EQ(6, ild(u"b≥m◘P╦")); /* vpdpbusd %xmm3,%xmm2,%xmm1 */
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ASSERT_EQ(11 /* vpdpbusd 0x10000000(%rcx,%r14,8),%xmm2,%xmm1 */,
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ild(u"b▓m◘Pî± ►"));
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}
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TEST(x86ild, testAmd3dnow) {
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ASSERT_EQ(4, ild(u"☼☼╚ª")); /* pfrcpit1 %mm0,%mm1 */
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struct XedDecodedInst xedd;
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ASSERT_EQ(
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0, xed_instruction_length_decode(
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xed_decoded_inst_zero_set_mode(&xedd, XED_MACHINE_MODE_LEGACY_32),
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gc(unbingx86op(u"☼☼╚ª")), 4));
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ASSERT_EQ(true, (int)xedd.op.amd3dnow);
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ASSERT_EQ(0xa6, xedd.op.opcode);
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}
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TEST(x86ild, testPopToMemory) {
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ASSERT_EQ(3, ild(u"ÅF◘")); /* 8f 46 08 */
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}
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TEST(x86ild, testFinit) {
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ASSERT_EQ(1, ild(u"¢█π")); /* 9B DB E3: fwait */
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ASSERT_EQ(2, ild(u"█π")); /* DB E3: fninit */
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}
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BENCH(x86ild, bench) {
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uint8_t *x = gc(unbingx86op(u"b▓m◘Pî± ►"));
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struct XedDecodedInst xedd;
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EZBENCH2("x86ild", donothing,
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xed_instruction_length_decode(
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xed_decoded_inst_zero_set_mode(&xedd, XED_MACHINE_MODE_LONG_64),
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x, XED_MAX_INSTRUCTION_BYTES));
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}
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