mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
103 lines
4.5 KiB
C
103 lines
4.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/bits/safemacros.internal.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/fmt/fmt.h"
|
|
#include "libc/log/gdb.h"
|
|
#include "libc/log/log.h"
|
|
#include "libc/nexgen32e/stackframe.h"
|
|
#include "libc/nexgen32e/vendor.internal.h"
|
|
#include "libc/paths.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/runtime/symbols.internal.h"
|
|
#include "libc/stdio/stdio.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/fileno.h"
|
|
#include "libc/sysv/consts/o.h"
|
|
#include "libc/sysv/consts/w.h"
|
|
|
|
#define RESTORE_TTY "\e[?1000;1002;1015;1006l\e[?25h"
|
|
|
|
/**
|
|
* Launches GDB debugger GUI for current process.
|
|
*
|
|
* This function abstracts the toilsome details of configuring the best
|
|
* possible UX for debugging your app, for varying levels of available
|
|
* information, on most of the various platforms.
|
|
*
|
|
* Before calling this function, consider placing showcrashreports() in
|
|
* your main function and calling DebugBreak() wherever you want; it's
|
|
* safer. Also note the "GDB" environment variable can be set to empty
|
|
* string, as a fail-safe for disabling this behavior.
|
|
*
|
|
* @param continuetoaddr can be a code address, 0, or -1 for auto
|
|
* @return gdb pid if continuing, 0 if detached, or -1 w/ errno
|
|
* @note this is called via eponymous spinlock macro wrapper
|
|
*/
|
|
relegated int(attachdebugger)(intptr_t continuetoaddr) {
|
|
int pid, ttyfd;
|
|
struct StackFrame *bp;
|
|
char pidstr[11], breakcmd[40];
|
|
const char *se, *elf, *gdb, *rewind, *layout;
|
|
if (IsGenuineCosmo() || !(gdb = GetGdbPath()) ||
|
|
(ttyfd = open(_PATH_TTY, O_RDWR | O_CLOEXEC)) == -1) {
|
|
return -1;
|
|
}
|
|
write(ttyfd, RESTORE_TTY, strlen(RESTORE_TTY));
|
|
snprintf(pidstr, sizeof(pidstr), "%u", getpid());
|
|
layout = "layout asm";
|
|
if ((elf = FindDebugBinary())) {
|
|
se = "-se";
|
|
if (fileexists(__FILE__)) layout = "layout src";
|
|
} else {
|
|
se = "-q";
|
|
elf = "-q";
|
|
}
|
|
if (continuetoaddr) {
|
|
if (continuetoaddr == -1) {
|
|
bp = __builtin_frame_address(0);
|
|
continuetoaddr = bp->addr;
|
|
}
|
|
rewind = "-ex";
|
|
snprintf(breakcmd, sizeof(breakcmd), "%s *%#p", "break", continuetoaddr);
|
|
} else {
|
|
rewind = NULL;
|
|
breakcmd[0] = '\0';
|
|
}
|
|
if (!(pid = vfork())) {
|
|
dup2(ttyfd, 0);
|
|
dup2(ttyfd, 1);
|
|
execv(gdb, (char *const[]){
|
|
"gdb", "--tui",
|
|
"-p", pidstr,
|
|
se, elf,
|
|
"-ex", "set osabi GNU/Linux",
|
|
"-ex", "set complaints 0",
|
|
"-ex", "set confirm off",
|
|
"-ex", layout,
|
|
"-ex", "layout reg",
|
|
"-ex", "set var g_gdbsync = 1",
|
|
"-q", rewind,
|
|
breakcmd, "-ex",
|
|
"c", NULL,
|
|
});
|
|
abort();
|
|
}
|
|
return pid;
|
|
}
|