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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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18
dsp/tty/rgb2ansi.c
View file

@ -20,6 +20,7 @@
#include "dsp/core/core.h"
#include "dsp/tty/quant.h"
#include "libc/assert.h"
#include "libc/bits/initializer.h"
#include "libc/limits.h"
#include "libc/log/log.h"
#include "libc/macros.h"
@ -32,12 +33,8 @@
#define SQR(X) ((X) * (X))
#define SUM(X, Y, Z) ((X) + (Y) + (Z))
static const uint8_t kXtermCube[] = {0, 0137, 0207, 0257, 0327, 0377};
const uint8_t kXtermCube[6] = {0, 0137, 0207, 0257, 0327, 0377};
struct TtyRgb g_ansi2rgb_[256];
static uint8_t g_quant[256];
static uint8_t g_rindex[256];
static uint8_t g_gindex[256];
static uint8_t g_bindex[256];
double g_xterm256_gamma;
struct TtyRgb tty2rgb_(struct TtyRgb rgbxt) {
@ -101,17 +98,10 @@ static int uncube(int x) {
return x < 48 ? 0 : x < 115 ? 1 : (x - 35) / 40;
}
static optimizesize textstartup void xterm2rgbsetup_(void) {
static textstartup void rgb2ansi_init(void) {
uint8_t c, y;
uint32_t i, j;
memcpy(g_ansi2rgb_, &kCgaPalette, sizeof(kCgaPalette));
for (i = 0; i < 256; ++i) {
j = uncube(i);
g_quant[i] = kXtermCube[j];
g_rindex[i] = j * 36;
g_gindex[i] = j * 6;
g_bindex[i] = j + 16;
}
for (i = 16; i < 232; ++i) {
g_ansi2rgb_[i].r = kXtermCube[((i - 020) / 044) % 06];
g_ansi2rgb_[i].g = kXtermCube[((i - 020) / 06) % 06];
@ -126,4 +116,4 @@ static optimizesize textstartup void xterm2rgbsetup_(void) {
}
}
INITIALIZER(301, _init_ansi2rgb, xterm2rgbsetup_());
const void *const rgb2ansi_init_ctor[] initarray = {rgb2ansi_init};