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CPU: Handle breakpoint trap

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Also, start working on the debugger app.
This commit is contained in:
Itamar 2020-04-03 14:50:17 +03:00 • committed by Andreas Kling
parent c112f53357
commit 77f671b462
10 changed files with 184 additions and 23 deletions
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123
Applications/Debugger/main.cpp Normal file
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Assertions.h>
#include <LibC/sys/arch/i386/regs.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <unistd.h>
static int usage()
{
printf("usage: sdb [command...]\n");
return 1;
}
static int g_pid = -1;
static void handle_sigint(int)
{
if (g_pid == -1)
return;
if (ptrace(PT_DETACH, g_pid, 0, 0) == -1) {
perror("detach");
}
}
void run_child_and_attach(char** argv)
{
int pid = fork();
if (!pid) {
if (ptrace(PT_TRACE_ME, 0, 0, 0) == -1) {
perror("traceme");
return exit(1);
}
int rc = execvp(argv[1], &argv[1]);
if (rc < 0) {
perror("execvp");
exit(1);
}
ASSERT_NOT_REACHED();
}
if (waitpid(pid, nullptr, WSTOPPED) != pid) {
perror("waitpid");
exit(1);
}
g_pid = pid;
}
int main(int argc, char** argv)
{
if (argc == 1)
return usage();
run_child_and_attach(argv);
struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = handle_sigint;
sigaction(SIGINT, &sa, nullptr);
if (ptrace(PT_ATTACH, g_pid, 0, 0) == -1) {
perror("attach");
return 1;
}
if (waitpid(g_pid, nullptr, WSTOPPED) != g_pid) {
perror("waitpid");
return 1;
}
if (ptrace(PT_CONTINUE, g_pid, 0, 0) == -1) {
perror("continue");
}
// wait for breakpoint
if (waitpid(g_pid, nullptr, WSTOPPED) != g_pid) {
perror("waitpid");
return 1;
}
printf("hit breakpoint\n");
sleep(1);
if (ptrace(PT_CONTINUE, g_pid, 0, 0) == -1) {
perror("continue");
}
if (waitpid(g_pid, nullptr, WSTOPPED) != g_pid) {
perror("waitpid");
return 1;
}
}