qemu/bsd-user/strace.c

#include <stdio.h>
#include <errno.h>
#include <sys/select.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/syscall.h>
#include "qemu.h"

int do_strace=0;

struct syscallname {
    int nr;
    const char *name;
    const char *format;
    void (*call)(const struct syscallname *,
                 abi_long, abi_long, abi_long,
                 abi_long, abi_long, abi_long);
    void (*result)(const struct syscallname *, abi_long);
};

/*
 * Utility functions
 */

static void
print_execve(const struct syscallname *name,
             abi_long arg1, abi_long arg2, abi_long arg3,
             abi_long arg4, abi_long arg5, abi_long arg6)
{
    abi_ulong arg_ptr_addr;
    char *s;

    if (!(s = lock_user_string(arg1)))
        return;
    gemu_log("%s(\"%s\",{", name->name, s);
    unlock_user(s, arg1, 0);

    for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) {
        abi_ulong *arg_ptr, arg_addr;

        arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1);
        if (!arg_ptr)
            return;
        arg_addr = tswapl(*arg_ptr);
        unlock_user(arg_ptr, arg_ptr_addr, 0);
        if (!arg_addr)
            break;
        if ((s = lock_user_string(arg_addr))) {
            gemu_log("\"%s\",", s);
            unlock_user(s, arg_addr, 0);
        }
    }

    gemu_log("NULL})");
}

/*
 * Variants for the return value output function
 */

static void
print_syscall_ret_addr(const struct syscallname *name, abi_long ret)
{
if( ret == -1 ) {
        gemu_log(" = -1 errno=%d (%s)\n", errno, strerror(errno));
    } else {
        gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
    }
}

#if 0 /* currently unused */
static void
print_syscall_ret_raw(struct syscallname *name, abi_long ret)
{
        gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
}
#endif

/*
 * An array of all of the syscalls we know about
 */

static const struct syscallname freebsd_scnames[] = {
#include "freebsd/strace.list"
};
static const struct syscallname netbsd_scnames[] = {
#include "netbsd/strace.list"
};
static const struct syscallname openbsd_scnames[] = {
#include "openbsd/strace.list"
};

static void
print_syscall(int num, const struct syscallname *scnames, unsigned int nscnames,
              abi_long arg1, abi_long arg2, abi_long arg3,
              abi_long arg4, abi_long arg5, abi_long arg6)
{
    unsigned int i;
    const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
        TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
        TARGET_ABI_FMT_ld ")";

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

    for (i = 0; i < nscnames; i++)
        if (scnames[i].nr == num) {
            if (scnames[i].call != NULL) {
                scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5,
                                arg6);
            } else {
                /* XXX: this format system is broken because it uses
                   host types and host pointers for strings */
                if (scnames[i].format != NULL)
                    format = scnames[i].format;
                gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4,
                         arg5, arg6);
            }
            return;
        }
    gemu_log("Unknown syscall %d\n", num);
}

static void
print_syscall_ret(int num, abi_long ret, const struct syscallname *scnames,
                  unsigned int nscnames)
{
    unsigned int i;

    for (i = 0; i < nscnames; 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=" TARGET_ABI_FMT_ld " (%s)\n", -ret,
                             strerror(-ret));
                } else {
                    gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret);
                }
            }
            break;
        }
}

/*
 * The public interface to this module.
 */
void
print_freebsd_syscall(int num,
                      abi_long arg1, abi_long arg2, abi_long arg3,
                      abi_long arg4, abi_long arg5, abi_long arg6)
{
    print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames),
                  arg1, arg2, arg3, arg4, arg5, arg6);
}

void
print_freebsd_syscall_ret(int num, abi_long ret)
{
    print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames));
}

void
print_netbsd_syscall(int num,
                      abi_long arg1, abi_long arg2, abi_long arg3,
                      abi_long arg4, abi_long arg5, abi_long arg6)
{
    print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames),
                  arg1, arg2, arg3, arg4, arg5, arg6);
}

void
print_netbsd_syscall_ret(int num, abi_long ret)
{
    print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames));
}

void
print_openbsd_syscall(int num,
                      abi_long arg1, abi_long arg2, abi_long arg3,
                      abi_long arg4, abi_long arg5, abi_long arg6)
{
    print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames),
                  arg1, arg2, arg3, arg4, arg5, arg6);
}

void
print_openbsd_syscall_ret(int num, abi_long ret)
{
    print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames));
}