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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/log/gdbexec.c Normal file
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/*-*- 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 │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/safemacros.h"
#include "libc/calls/calls.h"
#include "libc/calls/hefty/spawn.h"
#include "libc/fmt/fmt.h"
#include "libc/log/gdb.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/symbols.h"
/**
* Attachs GDB temporarilly, to do something like print a variable.
*/
int(gdbexec)(const char *cmd) {
int ttyin, ttyout;
struct StackFrame *bp;
intptr_t continuetoaddr;
const char *se, *elf, *gdb;
char pidstr[11], breakcmd[40];
if (!(gdb = commandv(firstnonnull(getenv("GDB"), "gdb")))) {
return -1;
}
snprintf(pidstr, sizeof(pidstr), "%u", getpid());
if ((elf = finddebugbinary())) {
se = "-se";
} else {
se = "-q";
elf = "-q";
}
bp = __builtin_frame_address(0);
continuetoaddr = bp->addr;
snprintf(breakcmd, sizeof(breakcmd), "%s *%#p", "break", bp->addr);
char *const args[] = {
"gdb",
"--nx",
"--nh",
"-p",
pidstr,
se,
elf,
"-ex",
"set osabi GNU/Linux",
"-ex",
"set complaints 0",
"-ex",
"set confirm off",
"-ex",
"set var g_gdbsync = 1",
"-q",
"-ex",
breakcmd,
"-ex",
cmd,
"-ex",
"quit",
NULL,
};
return SYNCHRONIZE_DEBUGGER(spawnve(0, NULL, gdb, args, environ));
}