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Add x86_64-linux-gnu emulator

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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
This commit is contained in:
Justine Tunney 2020-08-25 04:23:25 -07:00
parent 467504308a
commit f4f4caab0e
1052 changed files with 65667 additions and 7825 deletions
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29
libc/integral/c.inc
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@ -123,7 +123,7 @@ typedef _Bool bool;
#endif
#endif
#ifndef __cplusplus
#if !defined(__cplusplus) && !defined(__STRICT_ANSI__)
typedef __WCHAR_TYPE__ wchar_t;
typedef __CHAR16_TYPE__ char16_t;
typedef __CHAR32_TYPE__ char32_t;
@ -205,7 +205,7 @@ typedef uint64_t uintmax_t;
#define strlenesque libcesque nosideeffect paramsnonnull()
#define vallocesque \
libcesque nodiscard returnsaligned((PAGESIZE)) returnspointerwithnoaliases
#define reallocesque libcesque nodiscard returnsaligned((__BIGGEST_ALIGNMENT__))
#define reallocesque libcesque returnsaligned((__BIGGEST_ALIGNMENT__))
#define mallocesque reallocesque returnspointerwithnoaliases
#define interruptfn nocallersavedregisters forcealignargpointer
@ -530,6 +530,8 @@ typedef uint64_t uintmax_t;
/**
* Asks compiler to not optimize function definition.
*
* @todo this is dangerous delete?
*/
#ifndef nooptimize
#ifndef __STRICT_ANSI__
@ -547,6 +549,8 @@ typedef uint64_t uintmax_t;
* Asks compiler to generate as little code as possible for function.
*
* This does the same thing as relegated, but without relocation.
*
* @todo this is dangerous delete?
*/
#ifndef optimizesize
#ifndef __STRICT_ANSI__
@ -566,6 +570,8 @@ typedef uint64_t uintmax_t;
* This keyword provides an alternative to build flag tuning, in cases
* where the compiler is reluctant to vectorize mathematical code that's
* written in standards-compliant C rather than GCC extensions.
*
* @todo this is dangerous delete?
*/
#ifndef optimizespeed
#if !defined(__STRICT_ANSI__) && \
@ -602,7 +608,7 @@ typedef uint64_t uintmax_t;
#endif
/**
* Associates debug info with caller of inline function.
* Associates debug information with call site.
* @see nodebuginfo
*/
#ifndef artificial
@ -772,11 +778,11 @@ typedef uint64_t uintmax_t;
#define /* TODO(jart): delete */ assume(x) __builtin_assume(x)
#endif
#ifndef /* TODO(jart): delete */ likely
#ifndef likely
#define likely(expr) __builtin_expect(!!(expr), 1)
#endif
#ifndef /* TODO(jart): delete */ unlikely
#ifndef unlikely
#define unlikely(expr) __builtin_expect(!!(expr), 0)
#endif
@ -804,8 +810,8 @@ typedef uint64_t uintmax_t;
#ifndef __STRICT_ANSI__
#define testonly noinline _Section(".test")
#define textstartup _Section(".text.startup")
#define textexit _Section(".text.exit")
#define textstartup _Section(".text.startup") noinstrument
#define textexit _Section(".text.exit") noinstrument
#define textreal _Section(".text.real")
#define textwindows _Section(".text.windows")
#define antiquity _Section(".text.antiquity")
@ -860,6 +866,7 @@ typedef uint64_t uintmax_t;
/**
* Systemic suppressions.
*/
#ifndef __STRICT_ANSI__
#if defined(__GNUC__) || defined(__llvm__)
#pragma GCC diagnostic ignored "-Wsign-compare" /* lint needs to change */
#pragma GCC diagnostic ignored "-Wtype-limits" /* makes macros unsafe */
@ -885,6 +892,9 @@ typedef uint64_t uintmax_t;
#pragma GCC diagnostic ignored /* tidy */ "-Wunused-but-set-variable"
#pragma GCC diagnostic ignored /* tidy */ "-Wunused-but-set-parameter"
#endif /* GCC6+ */
#if __GNUC__ + 0 >= 9
#pragma GCC diagnostic ignored /* "always true" breaks dce */ "-Waddress"
#endif /* GCC9+ */
#endif /* !C++ */
#endif /* GCC && !LLVM */
#ifdef __llvm__
@ -899,6 +909,7 @@ typedef uint64_t uintmax_t;
#pragma clang diagnostic ignored \
"-Wincompatible-pointer-types-discards-qualifiers"
#endif /* !GCC && LLVM */
#endif /* ANSI */
/**
* Elevate warnings of material consequence.
@ -912,6 +923,7 @@ typedef uint64_t uintmax_t;
* time, e.g. 1's complement, big endian, under 32bit word size, etc.
*/
#ifndef __W__
#ifndef __STRICT_ANSI__
#if defined(__GNUC__) || defined(__llvm__)
#pragma GCC diagnostic error "-Wpointer-arith"
#pragma GCC diagnostic error "-Wnonnull"
@ -939,7 +951,7 @@ typedef uint64_t uintmax_t;
#pragma GCC diagnostic error "-Wredundant-decls"
#if __GNUC__ >= 6
#pragma GCC diagnostic error "-Wnonnull-compare"
#ifndef /* we guarantee no stack overflow unless -D*/ STACK_FRAME_UNLIMITED
#if !defined(MODE_DBG) && !defined(STACK_FRAME_UNLIMITED)
#pragma GCC diagnostic error "-Wframe-larger-than=4096"
#if __GNUC__ >= 9
#pragma GCC diagnostic error "-Walloca-larger-than=1024"
@ -953,6 +965,7 @@ typedef uint64_t uintmax_t;
#ifdef __llvm__
#pragma clang diagnostic error "-Wassume"
#endif /* !GCC && LLVM */
#endif /* ANSI */
#endif /* -w */
/**