trace/main.c

#include "common.h"

#include "dwarf.c"
#include "eh_frame.c"
#include "util.c"
#include "command.c"

int
main(int argc, char *argv[])
{
    if (argc != 2) {
        printf("Usage: %s executable\n", argv[0]);
        return(1);
    }
    
    struct mi_process process = process_create(argv[1]);
    printf("pid of child = %d\n", process.pid);
    
    size_t max_command_length = 1023;
    int command_length = 0;
    char *command = malloc(max_command_length + 1);
    char *last_command = malloc(max_command_length + 1);
    
    parse_debug_info(process.elf, &process.debug);
    parse_eh_frame(process);
    
    process.base_address = 0x555555554000UL; // get_executable_base_address(file, proc.pid);
    process.main_address = get_address_of_subroutine(process, "main");
    
    printf("Base address: %#lx\n", process.base_address);
    printf("Main address: %#lx\n", process.main_address);
    
    printf("> ");
    fflush(stdout);
    
    parse_debug_line(process.elf, &process.debug);
    
    while ((command_length = getline(&command, &max_command_length, stdin))) {
        if (command_length == 1) {
            memset(command, 0, max_command_length);
            memcpy(command, last_command, command_length);
        }
        
        int wait = 0;
        
        if (0 == strncmp(command, "exit\n", command_length) || 0 == strncmp(command, "q\n", command_length)) {
            break;
        } else if (0 == strncmp(command, "regs\n", command_length)) {
            command_regs(process);
        } else if (0 == strncmp(command, "step\n", command_length)) {
            command_step(process);
        } else if (0 == strncmp(command, "start\n", command_length)) {
            command_start(process);
        } else if (0 == strncmp(command, "print ", 6)) {
            command_print(process, command + 6, command_length - 7);
        } else if (0 == strncmp(command, "next\n", command_length)) {
            command_next(process);
        } else if (0 == strncmp(command, "line\n", command_length)) {
            command_list(process);
        } else if (0 == strncmp(command, "bt\n", command_length)) {
            command_backtrace(process);
        } else if (0 == strncmp(command, "cont\n", command_length)) {
            command_cont(process);
            wait = 1;
        } else if (0 == strncmp(command, "kill\n", command_length)) {
            command_kill(process);
            wait = 1;
        } else {
            printf("Unknown command: %.*s", command_length, command);
        }
        
        if (wait) {
            int wstatus;
            int cpid = waitpid(process.pid, &wstatus, 0);
            
            if (cpid != 0) {
                if (WIFEXITED(wstatus)) {
                    int status = WEXITSTATUS(wstatus);
                    printf("Child terminated normally with status %d\n", status);
                    break;
                }
                
                if (WIFSIGNALED(wstatus)) {
                    int signal = WTERMSIG(wstatus);
                    printf("Child terminated by signal %d (%s)\n", signal, strsignal(signal));
                    break;
                }
                
                if (WIFSTOPPED(wstatus)) {
                    int signal = WSTOPSIG(wstatus);
                    printf("Child stopped by signal %d (%s)\n", signal, strsignal(signal));
                    break;
                }
                
                if (WIFCONTINUED(wstatus)) {
                    printf("Child continued by SIGCONT\n");
                }
            }
        }
        
        memset(last_command, 0, max_command_length);
        memcpy(last_command, command, command_length);
        
        printf("> ");
    }
    
    return(0);
}