102 lines
4.6 KiB
C
102 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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