Archipelago » qemu

#include <stdio.h>

#include <errno.h>

#include <sys/ipc.h>

#include <sys/msg.h>

#include <sys/sem.h>

#include <sys/shm.h>

#include <sys/select.h>

#include <sys/types.h>

#include <unistd.h>

#include "qemu.h"

int do_strace=0;

struct syscallname {

    int nr;

    char *name;

    char *format;

    void (*call)(struct syscallname *,

                 target_long, target_long, target_long,

                 target_long, target_long, target_long);

    void (*result)(struct syscallname *, target_long);

};

/*

 * Utility functions

 */

static void

print_ipc_cmd(int cmd)

{

#define output_cmd(val) \

if( cmd == val ) { \

    gemu_log(#val); \

    return; \

}

    cmd &= 0xff;

    /* General IPC commands */

    output_cmd( IPC_RMID );

    output_cmd( IPC_SET );

    output_cmd( IPC_STAT );

    output_cmd( IPC_INFO );

    /* msgctl() commands */

    #ifdef __USER_MISC

    output_cmd( MSG_STAT );

    output_cmd( MSG_INFO );

    #endif

    /* shmctl() commands */

    output_cmd( SHM_LOCK );

    output_cmd( SHM_UNLOCK );

    output_cmd( SHM_STAT );

    output_cmd( SHM_INFO );

    /* semctl() commands */

    output_cmd( GETPID );

    output_cmd( GETVAL );

    output_cmd( GETALL );

    output_cmd( GETNCNT );

    output_cmd( GETZCNT );

    output_cmd( SETVAL );

    output_cmd( SETALL );

    output_cmd( SEM_STAT );

    output_cmd( SEM_INFO );

    output_cmd( IPC_RMID );

    output_cmd( IPC_RMID );

    output_cmd( IPC_RMID );

    output_cmd( IPC_RMID );

    output_cmd( IPC_RMID );

    output_cmd( IPC_RMID );

    output_cmd( IPC_RMID );

    output_cmd( IPC_RMID );

    output_cmd( IPC_RMID );

    /* Some value we don't recognize */

    gemu_log("%d",cmd);

}

static void

print_fdset(int n, target_ulong target_fds_addr)

{

    int i;

    gemu_log("[");

    if( target_fds_addr ) {

        target_long *target_fds;

        if (!access_ok(VERIFY_READ, target_fds_addr, sizeof(*target_fds)*(n / TARGET_LONG_BITS + 1)))

            return;

        target_fds = lock_user(target_fds_addr, sizeof(*target_fds)*(n / TARGET_LONG_BITS + 1), 1);

        for (i=n; i>=0; i--) {

            if ((tswapl(target_fds[i / TARGET_LONG_BITS]) >> (i & (TARGET_LONG_BITS - 1))) & 1)

                gemu_log("%d,", i );

            }

        unlock_user(target_fds, target_fds_addr, 0);

    }

    gemu_log("]");

}

static void

print_timeval(target_ulong tv_addr)

{

    if( tv_addr ) {

        struct target_timeval *tv;

        if (!access_ok(VERIFY_READ, tv_addr, sizeof(*tv)))

            return;

        tv = lock_user(tv_addr, sizeof(*tv), 1);

        gemu_log("{%d,%d}", tv->tv_sec, tv->tv_usec);

        unlock_user(tv, tv_addr, 0);

    } else

        gemu_log("NULL");

}

/*

 * Sysycall specific output functions

 */

/* select */

static long newselect_arg1 = 0;

static long newselect_arg2 = 0;

static long newselect_arg3 = 0;

static long newselect_arg4 = 0;

static long newselect_arg5 = 0;

static void

print_newselect(struct syscallname *name,

                target_long arg1, target_long arg2, target_long arg3,

                target_long arg4, target_long arg5, target_long arg6)

{

    gemu_log("%s(" TARGET_FMT_ld ",", name->name, arg1);

    print_fdset(arg1, arg2);

    gemu_log(",");

    print_fdset(arg1, arg3);

    gemu_log(",");

    print_fdset(arg1, arg4);

    gemu_log(",");

    print_timeval(arg5);

    gemu_log(")");

    /* save for use in the return output function below */

    newselect_arg1=arg1;

    newselect_arg2=arg2;

    newselect_arg3=arg3;

    newselect_arg4=arg4;

    newselect_arg5=arg5;

}

static void

print_semctl(struct syscallname *name,

             target_long arg1, target_long arg2, target_long arg3,

             target_long arg4, target_long arg5, target_long arg6)

{

    gemu_log("%s(" TARGET_FMT_ld "," TARGET_FMT_ld ",", name->name, arg1, arg2);

    print_ipc_cmd(arg3);

    gemu_log(",0x" TARGET_FMT_lx ")", arg4);

}

static void

print_execve(struct syscallname *name,

             target_long arg1, target_long arg2, target_long arg3,

             target_long arg4, target_long arg5, target_long arg6)

{

    target_ulong arg_ptr_addr;

    char *s;

    if (!access_ok(VERIFY_READ, arg1, 1))

        return;

    s = lock_user_string(arg1);

    gemu_log("%s(\"%s\",{", name->name, s);

    unlock_user(s, arg1, 0);

    for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(target_ulong)) {

        target_ulong *arg_ptr, arg_addr, s_addr;

        if (!access_ok(VERIFY_READ, arg_ptr_addr, sizeof(target_ulong)))

            return;

        arg_ptr = lock_user(arg_ptr_addr, sizeof(target_ulong), 1);

        arg_addr = tswapl(*arg_ptr);

        unlock_user(arg_ptr, arg_ptr_addr, 0);

        if (!arg_addr)

            break;

        s = lock_user_string(arg_addr);

        gemu_log("\"%s\",", s);

        unlock_user(s, s_addr, 0);

    }

    gemu_log("NULL})");

}

static void

print_ipc(struct syscallname *name,

          target_long arg1, target_long arg2, target_long arg3,

          target_long arg4, target_long arg5, target_long arg6)

{

    switch(arg1) {

    case IPCOP_semctl:

        name->name = "semctl";

        print_semctl(name,arg2,arg3,arg4,arg5,arg6,0);

        break;

    default:

        gemu_log("%s(" TARGET_FMT_ld "," TARGET_FMT_ld "," TARGET_FMT_ld "," TARGET_FMT_ld ")",

                 name->name, arg1, arg2, arg3, arg4);

    }

}

/*

 * Variants for the return value output function

 */

static void

print_syscall_ret_addr(struct syscallname *name, target_long ret)

{

if( ret == -1 ) {

        gemu_log(" = -1 errno=%d (%s)\n", errno, target_strerror(errno));

    } else {

        gemu_log(" = " TARGET_FMT_lx "\n", ret);

    }

}

static void

print_syscall_ret_raw(struct syscallname *name, target_long ret)

{

        gemu_log(" = " TARGET_FMT_lx "\n", ret);

}

static void

print_syscall_ret_newselect(struct syscallname *name, target_long ret)

{

    gemu_log(" = " TARGET_FMT_lx " (", ret);

    print_fdset(newselect_arg1,newselect_arg2);

    gemu_log(",");

    print_fdset(newselect_arg1,newselect_arg3);

    gemu_log(",");

    print_fdset(newselect_arg1,newselect_arg4);

    gemu_log(",");

    print_timeval(newselect_arg5);

    gemu_log(")\n");

}

/*

 * An array of all of the syscalls we know about

 */

static struct syscallname scnames[] = {

#include "strace.list"

};

static int nsyscalls = sizeof(scnames)/sizeof(struct syscallname);

/*

 * The public interface to this module.

 */

void

print_syscall(int num,

              target_long arg1, target_long arg2, target_long arg3,

              target_long arg4, target_long arg5, target_long arg6)

{

    int i;

    char *format="%s(%ld,%ld,%ld,%ld,%ld,%ld)";

    gemu_log("%d ", getpid() );

    for(i=0;i<nsyscalls;i++)

        if( scnames[i].nr == num ) {

            if( scnames[i].call != NULL ) {

                scnames[i].call(&scnames[i],arg1,arg2,arg3,arg4,arg5,arg6);

            } else {

                if( scnames[i].format != NULL )

                    format = scnames[i].format;

                gemu_log(format,scnames[i].name, arg1,arg2,arg3,arg4,arg5,arg6);

            }

            break;

        }

}

void

print_syscall_ret(int num, target_long ret)

{

    int i;

    for(i=0;i<nsyscalls;i++)

        if( scnames[i].nr == num ) {

            if( scnames[i].result != NULL ) {

                scnames[i].result(&scnames[i],ret);

            } else {

                if( ret < 0 ) {

                    gemu_log(" = -1 errno=%d (%s)\n", -ret, target_strerror(-ret));

                } else {

                    gemu_log(" = %d\n", ret);

                }

            }

            break;

        }

}