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https://github.com/jart/cosmopolitan.git
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9e3e985ae5
Here's some screenshots of an emulator tui program that was compiled on Linux, then scp'd it to Windows, Mac, and FreeBSD. https://justine.storage.googleapis.com/blinkenlights-cmdexe.png https://justine.storage.googleapis.com/blinkenlights-imac.png https://justine.storage.googleapis.com/blinkenlights-freebsd.png https://justine.storage.googleapis.com/blinkenlights-lisp.png How is this even possible that we have a nontrivial ui binary that just works on Mac, Windows, Linux, and BSD? Surely a first ever achievement. Fixed many bugs. Bootstrapped John McCarthy's metacircular evaluator on bare metal in half the size of Altair BASIC (about 2.5kb) and ran it in emulator for fun and profit.
101 lines
4.6 KiB
C
101 lines
4.6 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/safemacros.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/hefty/spawn.h"
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#include "libc/fmt/fmt.h"
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#include "libc/log/gdb.h"
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#include "libc/log/log.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/nexgen32e/vendor.h"
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#include "libc/paths.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/w.h"
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#define RESTORE_TTY "\e[?1000;1002;1015;1006l\e[?25h"
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/**
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* Launches GDB debugger GUI for current process.
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*
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* This function abstracts the toilsome details of configuring the best
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* possible UX for debugging your app, for varying levels of available
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* information, on most of the various platforms.
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*
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* Before calling this function, consider placing showcrashreports() in
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* your main function and calling DebugBreak() wherever you want; it's
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* safer. Also note the "GDB" environment variable can be set to empty
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* string, as a fail-safe for disabling this behavior.
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*
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* @param continuetoaddr can be a code address, 0, or -1 for auto
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* @return gdb pid if continuing, 0 if detached, or -1 w/ errno
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* @note this is called via eponymous spinlock macro wrapper
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*/
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relegated int(attachdebugger)(intptr_t continuetoaddr) {
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int ttyfd;
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struct StackFrame *bp;
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char pidstr[11], breakcmd[40];
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const char *se, *elf, *gdb, *rewind, *layout;
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if (IsGenuineCosmo() || !(gdb = GetGdbPath()) ||
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(ttyfd = open(_PATH_TTY, O_RDWR, 0)) == -1) {
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return -1;
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}
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write(ttyfd, RESTORE_TTY, strlen(RESTORE_TTY));
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snprintf(pidstr, sizeof(pidstr), "%u", getpid());
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layout = "layout asm";
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if ((elf = FindDebugBinary())) {
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se = "-se";
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if (fileexists(__FILE__)) layout = "layout src";
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} else {
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se = "-q";
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elf = "-q";
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}
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if (continuetoaddr) {
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if (continuetoaddr == -1) {
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bp = __builtin_frame_address(0);
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continuetoaddr = bp->addr;
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}
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rewind = "-ex";
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snprintf(breakcmd, sizeof(breakcmd), "%s *%#p", "break", continuetoaddr);
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} else {
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rewind = NULL;
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breakcmd[0] = '\0';
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}
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return spawnve(0, (int[3]){ttyfd, ttyfd, STDERR_FILENO}, gdb,
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(char *const[]){
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"gdb", "--tui",
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"-p", pidstr,
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se, elf,
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"-ex", "set osabi GNU/Linux",
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"-ex", "set complaints 0",
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"-ex", "set confirm off",
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"-ex", layout,
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"-ex", "layout reg",
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"-ex", "set var g_gdbsync = 1",
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"-q", rewind,
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breakcmd, "-ex",
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"c", NULL,
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},
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environ);
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}
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