Hello Fabrice,
I've played a bit with your qemu-0.1.2 release, and got putty running under Wine under qemu on s390-ibm-linux (using a wineserver also running under qemu on s390).
To make this work I've had to add a bunch of missing byteorder conversions and other fixes, which I've appended here.
Mostly, the changes concern the socket area; wine and wineserver extensively use sockets (sendmsg/recvmsg with ancillary data), and also the X connection needed fixes (setsockopt). There were also some other fixes required (poll, select, execve). I haven't found any problem with the actual CPU emulation, however!
Here's the detailed list of changes:
glibc-2.3.2 compile fix:
Recent glibc supports nanosecond resolution file timestamps in their struct stat, using this construct struct timespec st_atim; /* Time of last access. */ struct timespec st_mtim; /* Time of last modification. */ struct timespec st_ctim; /* Time of last status change. */ # define st_atime st_atim.tv_sec /* Backward compatibility. */ # define st_mtime st_mtim.tv_sec # define st_ctime st_ctim.tv_sec
This breaks the use of st_atime etc. as struct members; I've renamed them to target_st_atime etc.
Missing data conversion:
- socketcall on-stack arguments need to be byteswapped - struct sockaddr (sa_family) needs to be byteswapped - sendmsg/recvmsg ancillary data needs to be converted - execve arg and env vectors need to be byteswapped - select fdset conversion wasn't done due to typo in #if - added marginal support for setsockopt
Incorrect data conversion:
- poll pollfd array was clobbered (even on native)
If you like, I could also send you the patch to make qemu actually work on s390; I'm not sure if you are interested in that at this point ...
Bye, Ulrich
diff -ur qemu-0.1.2/syscall-i386.h qemu-0.1.2-s390/syscall-i386.h --- qemu-0.1.2/syscall-i386.h 2003-03-26 23:34:59.000000000 +0100 +++ qemu-0.1.2-s390/syscall-i386.h 2003-03-29 02:33:28.000000000 +0100 @@ -255,11 +255,11 @@ target_ulong st_size; target_ulong st_blksize; target_ulong st_blocks; - target_ulong st_atime; + target_ulong target_st_atime; target_ulong __unused1; - target_ulong st_mtime; + target_ulong target_st_mtime; target_ulong __unused2; - target_ulong st_ctime; + target_ulong target_st_ctime; target_ulong __unused3; target_ulong __unused4; target_ulong __unused5; @@ -290,13 +290,13 @@ target_ulong st_blocks; /* Number 512-byte blocks allocated. */ target_ulong __pad4; /* future possible st_blocks high bits */
- target_ulong st_atime; + target_ulong target_st_atime; target_ulong __pad5;
- target_ulong st_mtime; + target_ulong target_st_mtime; target_ulong __pad6;
- target_ulong st_ctime; + target_ulong target_st_ctime; target_ulong __pad7; /* will be high 32 bits of ctime someday */
unsigned long long st_ino; diff -ur qemu-0.1.2/syscall.c qemu-0.1.2-s390/syscall.c --- qemu-0.1.2/syscall.c 2003-03-26 23:34:59.000000000 +0100 +++ qemu-0.1.2-s390/syscall.c 2003-03-29 04:45:12.000000000 +0100 @@ -26,6 +26,7 @@ #include <errno.h> #include <unistd.h> #include <fcntl.h> +#include <time.h> #include <sys/types.h> #include <sys/wait.h> #include <sys/time.h> @@ -40,6 +41,7 @@ #include <sys/uio.h> #include <sys/poll.h> //#include <sys/user.h> +#include <netinet/tcp.h>
#define termios host_termios #define winsize host_winsize @@ -166,7 +168,7 @@ static inline fd_set *target_to_host_fds(fd_set *fds, target_long *target_fds, int n) { -#if !defined(BSWP_NEEDED) && !defined(WORD_BIGENDIAN) +#if !defined(BSWP_NEEDED) && !defined(WORDS_BIGENDIAN) return (fd_set *)target_fds; #else int i, b; @@ -188,7 +190,7 @@ static inline void host_to_target_fds(target_long *target_fds, fd_set *fds, int n) { -#if !defined(BSWP_NEEDED) && !defined(WORD_BIGENDIAN) +#if !defined(BSWP_NEEDED) && !defined(WORDS_BIGENDIAN) /* nothing to do */ #else int i, nw, j, k; @@ -256,55 +258,267 @@ return ret; }
-static long do_socketcall(int num, long *vptr) +static inline void target_to_host_sockaddr(struct sockaddr *addr, + struct target_sockaddr *target_addr, + socklen_t len) +{ + memcpy(addr, target_addr, len); + addr->sa_family = tswap16(target_addr->sa_family); +} + +static inline void host_to_target_sockaddr(struct target_sockaddr *target_addr, + struct sockaddr *addr, + socklen_t len) +{ + memcpy(target_addr, addr, len); + target_addr->sa_family = tswap16(addr->sa_family); +} + +static inline void target_to_host_cmsg(struct msghdr *msgh, + struct target_msghdr *target_msgh) +{ + struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh); + struct target_cmsghdr *target_cmsg = TARGET_CMSG_FIRSTHDR(target_msgh); + socklen_t space = 0; + + while (cmsg && target_cmsg) { + void *data = CMSG_DATA(cmsg); + void *target_data = TARGET_CMSG_DATA(target_cmsg); + + int len = tswapl(target_cmsg->cmsg_len) + - TARGET_CMSG_ALIGN(sizeof (struct target_cmsghdr)); + + space += CMSG_SPACE(len); + if (space > msgh->msg_controllen) { + space -= CMSG_SPACE(len); + gemu_log("Host cmsg overflow"); + break; + } + + cmsg->cmsg_level = tswap32(target_cmsg->cmsg_level); + cmsg->cmsg_type = tswap32(target_cmsg->cmsg_type); + cmsg->cmsg_len = CMSG_LEN(len); + + if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { + gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type); + memcpy(data, target_data, len); + } else { + int *fd = (int *)data; + int *target_fd = (int *)target_data; + int i, numfds = len / sizeof(int); + + for (i = 0; i < numfds; i++) + fd[i] = tswap32(target_fd[i]); + } + + cmsg = CMSG_NXTHDR(msgh, cmsg); + target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg); + } + + msgh->msg_controllen = space; +} + +static inline void host_to_target_cmsg(struct target_msghdr *target_msgh, + struct msghdr *msgh) +{ + struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh); + struct target_cmsghdr *target_cmsg = TARGET_CMSG_FIRSTHDR(target_msgh); + socklen_t space = 0; + + while (cmsg && target_cmsg) { + void *data = CMSG_DATA(cmsg); + void *target_data = TARGET_CMSG_DATA(target_cmsg); + + int len = cmsg->cmsg_len - CMSG_ALIGN(sizeof (struct cmsghdr)); + + space += TARGET_CMSG_SPACE(len); + if (space > tswapl(target_msgh->msg_controllen)) { + space -= TARGET_CMSG_SPACE(len); + gemu_log("Target cmsg overflow"); + break; + } + + target_cmsg->cmsg_level = tswap32(cmsg->cmsg_level); + target_cmsg->cmsg_type = tswap32(cmsg->cmsg_type); + target_cmsg->cmsg_len = tswapl(TARGET_CMSG_LEN(len)); + + if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { + gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type); + memcpy(target_data, data, len); + } else { + int *fd = (int *)data; + int *target_fd = (int *)target_data; + int i, numfds = len / sizeof(int); + + for (i = 0; i < numfds; i++) + target_fd[i] = tswap32(fd[i]); + } + + cmsg = CMSG_NXTHDR(msgh, cmsg); + target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg); + } + + msgh->msg_controllen = tswapl(space); +} + +static long do_setsockopt(int sockfd, int level, int optname, + void *optval, socklen_t optlen) +{ + if (level == SOL_TCP) { + /* TCP options all take an 'int' value. */ + int val; + + if (optlen < sizeof(uint32_t)) + return -EINVAL; + + val = tswap32(*(uint32_t *)optval); + return get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val))); + } + + else if (level != SOL_SOCKET) { + gemu_log("Unsupported setsockopt level: %d\n", level); + return -ENOSYS; + } + + switch (optname) { + /* Options with 'int' argument. */ + case SO_DEBUG: + case SO_REUSEADDR: + case SO_TYPE: + case SO_ERROR: + case SO_DONTROUTE: + case SO_BROADCAST: + case SO_SNDBUF: + case SO_RCVBUF: + case SO_KEEPALIVE: + case SO_OOBINLINE: + case SO_NO_CHECK: + case SO_PRIORITY: + case SO_BSDCOMPAT: + case SO_PASSCRED: + case SO_TIMESTAMP: + case SO_RCVLOWAT: + case SO_RCVTIMEO: + case SO_SNDTIMEO: + { + int val; + if (optlen < sizeof(uint32_t)) + return -EINVAL; + val = tswap32(*(uint32_t *)optval); + return get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val))); + } + + default: + gemu_log("Unsupported setsockopt SOL_SOCKET option: %d\n", optname); + return -ENOSYS; + } +} + +static long do_getsockopt(int sockfd, int level, int optname, + void *optval, socklen_t *optlen) +{ + gemu_log("getsockopt not yet supported\n"); + return -ENOSYS; +} + +static long do_socketcall(int num, int32_t *vptr) { long ret;
switch(num) { case SOCKOP_socket: - ret = get_errno(socket(vptr[0], vptr[1], vptr[2])); + { + int domain = tswap32(vptr[0]); + int type = tswap32(vptr[1]); + int protocol = tswap32(vptr[2]); + + ret = get_errno(socket(domain, type, protocol)); + } break; case SOCKOP_bind: - ret = get_errno(bind(vptr[0], (struct sockaddr *)vptr[1], vptr[2])); + { + int sockfd = tswap32(vptr[0]); + void *target_addr = (void *)tswap32(vptr[1]); + socklen_t addrlen = tswap32(vptr[2]); + void *addr = alloca(addrlen); + + target_to_host_sockaddr(addr, target_addr, addrlen); + ret = get_errno(bind(sockfd, addr, addrlen)); + } break; case SOCKOP_connect: - ret = get_errno(connect(vptr[0], (struct sockaddr *)vptr[1], vptr[2])); + { + int sockfd = tswap32(vptr[0]); + void *target_addr = (void *)tswap32(vptr[1]); + socklen_t addrlen = tswap32(vptr[2]); + void *addr = alloca(addrlen); + + target_to_host_sockaddr(addr, target_addr, addrlen); + ret = get_errno(connect(sockfd, addr, addrlen)); + } break; case SOCKOP_listen: - ret = get_errno(listen(vptr[0], vptr[1])); + { + int sockfd = tswap32(vptr[0]); + int backlog = tswap32(vptr[1]); + + ret = get_errno(listen(sockfd, backlog)); + } break; case SOCKOP_accept: { - socklen_t size; - size = tswap32(*(int32_t *)vptr[2]); - ret = get_errno(accept(vptr[0], (struct sockaddr *)vptr[1], &size)); - if (!is_error(ret)) - *(int32_t *)vptr[2] = size; + int sockfd = tswap32(vptr[0]); + void *target_addr = (void *)tswap32(vptr[1]); + uint32_t *target_addrlen = (void *)tswap32(vptr[2]); + socklen_t addrlen = tswap32(*target_addrlen); + void *addr = alloca(addrlen); + + ret = get_errno(accept(sockfd, addr, &addrlen)); + if (!is_error(ret)) { + host_to_target_sockaddr(target_addr, addr, addrlen); + *target_addrlen = tswap32(addrlen); + } } break; case SOCKOP_getsockname: { - socklen_t size; - size = tswap32(*(int32_t *)vptr[2]); - ret = get_errno(getsockname(vptr[0], (struct sockaddr *)vptr[1], &size)); - if (!is_error(ret)) - *(int32_t *)vptr[2] = size; + int sockfd = tswap32(vptr[0]); + void *target_addr = (void *)tswap32(vptr[1]); + uint32_t *target_addrlen = (void *)tswap32(vptr[2]); + socklen_t addrlen = tswap32(*target_addrlen); + void *addr = alloca(addrlen); + + ret = get_errno(getsockname(sockfd, addr, &addrlen)); + if (!is_error(ret)) { + host_to_target_sockaddr(target_addr, addr, addrlen); + *target_addrlen = tswap32(addrlen); + } } break; case SOCKOP_getpeername: { - socklen_t size; - size = tswap32(*(int32_t *)vptr[2]); - ret = get_errno(getpeername(vptr[0], (struct sockaddr *)vptr[1], &size)); - if (!is_error(ret)) - *(int32_t *)vptr[2] = size; + int sockfd = tswap32(vptr[0]); + void *target_addr = (void *)tswap32(vptr[1]); + uint32_t *target_addrlen = (void *)tswap32(vptr[2]); + socklen_t addrlen = tswap32(*target_addrlen); + void *addr = alloca(addrlen); + + ret = get_errno(getpeername(sockfd, addr, &addrlen)); + if (!is_error(ret)) { + host_to_target_sockaddr(target_addr, addr, addrlen); + *target_addrlen = tswap32(addrlen); + } } break; case SOCKOP_socketpair: { + int domain = tswap32(vptr[0]); + int type = tswap32(vptr[1]); + int protocol = tswap32(vptr[2]); + int32_t *target_tab = (void *)tswap32(vptr[3]); int tab[2]; - int32_t *target_tab = (int32_t *)vptr[3]; - ret = get_errno(socketpair(vptr[0], vptr[1], vptr[2], tab)); + + ret = get_errno(socketpair(domain, type, protocol, tab)); if (!is_error(ret)) { target_tab[0] = tswap32(tab[0]); target_tab[1] = tswap32(tab[1]); @@ -312,27 +526,64 @@ } break; case SOCKOP_send: - ret = get_errno(send(vptr[0], (void *)vptr[1], vptr[2], vptr[3])); + { + int sockfd = tswap32(vptr[0]); + void *msg = (void *)tswap32(vptr[1]); + size_t len = tswap32(vptr[2]); + int flags = tswap32(vptr[3]); + + ret = get_errno(send(sockfd, msg, len, flags)); + } break; case SOCKOP_recv: - ret = get_errno(recv(vptr[0], (void *)vptr[1], vptr[2], vptr[3])); + { + int sockfd = tswap32(vptr[0]); + void *msg = (void *)tswap32(vptr[1]); + size_t len = tswap32(vptr[2]); + int flags = tswap32(vptr[3]); + + ret = get_errno(recv(sockfd, msg, len, flags)); + } break; case SOCKOP_sendto: - ret = get_errno(sendto(vptr[0], (void *)vptr[1], vptr[2], vptr[3], - (struct sockaddr *)vptr[4], vptr[5])); + { + int sockfd = tswap32(vptr[0]); + void *msg = (void *)tswap32(vptr[1]); + size_t len = tswap32(vptr[2]); + int flags = tswap32(vptr[3]); + void *target_addr = (void *)tswap32(vptr[4]); + socklen_t addrlen = tswap32(vptr[5]); + void *addr = alloca(addrlen); + + target_to_host_sockaddr(addr, target_addr, addrlen); + ret = get_errno(sendto(sockfd, msg, len, flags, addr, addrlen)); + } break; case SOCKOP_recvfrom: { - socklen_t size; - size = tswap32(*(int32_t *)vptr[5]); - ret = get_errno(recvfrom(vptr[0], (void *)vptr[1], vptr[2], - vptr[3], (struct sockaddr *)vptr[4], &size)); - if (!is_error(ret)) - *(int32_t *)vptr[5] = size; + int sockfd = tswap32(vptr[0]); + void *msg = (void *)tswap32(vptr[1]); + size_t len = tswap32(vptr[2]); + int flags = tswap32(vptr[3]); + void *target_addr = (void *)tswap32(vptr[4]); + uint32_t *target_addrlen = (void *)tswap32(vptr[5]); + socklen_t addrlen = tswap32(*target_addrlen); + void *addr = alloca(addrlen); + + ret = get_errno(recvfrom(sockfd, msg, len, flags, addr, &addrlen)); + if (!is_error(ret)) { + host_to_target_sockaddr(target_addr, addr, addrlen); + *target_addrlen = tswap32(addrlen); + } } break; case SOCKOP_shutdown: - ret = get_errno(shutdown(vptr[0], vptr[1])); + { + int sockfd = tswap32(vptr[0]); + int how = tswap32(vptr[1]); + + ret = get_errno(shutdown(sockfd, how)); + } break; case SOCKOP_sendmsg: case SOCKOP_recvmsg: @@ -344,11 +595,11 @@ struct iovec *vec; struct target_iovec *target_vec;
- msgp = (void *)vptr[1]; + msgp = (void *)tswap32(vptr[1]); msg.msg_name = (void *)tswapl(msgp->msg_name); msg.msg_namelen = tswapl(msgp->msg_namelen); - msg.msg_control = (void *)tswapl(msgp->msg_control); - msg.msg_controllen = tswapl(msgp->msg_controllen); + msg.msg_controllen = 2 * tswapl(msgp->msg_controllen); + msg.msg_control = alloca(msg.msg_controllen); msg.msg_flags = tswap32(msgp->msg_flags);
count = tswapl(msgp->msg_iovlen); @@ -361,17 +612,43 @@ msg.msg_iovlen = count; msg.msg_iov = vec;
- fd = vptr[0]; - flags = vptr[2]; - if (num == SOCKOP_sendmsg) - ret = sendmsg(fd, &msg, flags); - else - ret = recvmsg(fd, &msg, flags); - ret = get_errno(ret); + fd = tswap32(vptr[0]); + flags = tswap32(vptr[2]); + if (num == SOCKOP_sendmsg) { + target_to_host_cmsg(&msg, msgp); + ret = get_errno(sendmsg(fd, &msg, flags)); + } else { + ret = get_errno(recvmsg(fd, &msg, flags)); + if (!is_error(ret)) + host_to_target_cmsg(msgp, &msg); + } } break; case SOCKOP_setsockopt: + { + int sockfd = tswap32(vptr[0]); + int level = tswap32(vptr[1]); + int optname = tswap32(vptr[2]); + void *optval = (void *)tswap32(vptr[3]); + socklen_t optlen = tswap32(vptr[4]); + + ret = do_setsockopt(sockfd, level, optname, optval, optlen); + } + break; case SOCKOP_getsockopt: + { + int sockfd = tswap32(vptr[0]); + int level = tswap32(vptr[1]); + int optname = tswap32(vptr[2]); + void *optval = (void *)tswap32(vptr[3]); + uint32_t *target_len = (void *)tswap32(vptr[4]); + socklen_t optlen = tswap32(*target_len); + + ret = do_getsockopt(sockfd, level, optname, optval, &optlen); + if (!is_error(ret)) + *target_len = tswap32(optlen); + } + break; default: gemu_log("Unsupported socketcall: %d\n", num); ret = -ENOSYS; @@ -880,7 +1157,27 @@ ret = get_errno(unlink((const char *)arg1)); break; case TARGET_NR_execve: - ret = get_errno(execve((const char *)arg1, (void *)arg2, (void *)arg3)); + { + char **argp, **envp; + int argc = 0, envc = 0; + uint32_t *p; + char **q; + + for (p = (void *)arg2; *p; p++) + argc++; + for (p = (void *)arg3; *p; p++) + envc++; + + argp = alloca(argc * sizeof(void *)); + envp = alloca(envc * sizeof(void *)); + + for (p = (void *)arg2, q = argp; *p; p++, q++) + *q = (void *)tswap32(*p); + for (p = (void *)arg3, q = envp; *p; p++, q++) + *q = (void *)tswap32(*p); + + ret = get_errno(execve((const char *)arg1, argp, envp)); + } break; case TARGET_NR_chdir: ret = get_errno(chdir((const char *)arg1)); @@ -1404,7 +1701,7 @@ case TARGET_NR_ioperm: goto unimplemented; case TARGET_NR_socketcall: - ret = do_socketcall(arg1, (long *)arg2); + ret = do_socketcall(arg1, (int32_t *)arg2); break; case TARGET_NR_syslog: goto unimplemented; @@ -1468,9 +1765,9 @@ target_st->st_size = tswapl(st.st_size); target_st->st_blksize = tswapl(st.st_blksize); target_st->st_blocks = tswapl(st.st_blocks); - target_st->st_atime = tswapl(st.st_atime); - target_st->st_mtime = tswapl(st.st_mtime); - target_st->st_ctime = tswapl(st.st_ctime); + target_st->target_st_atime = tswapl(st.st_atime); + target_st->target_st_mtime = tswapl(st.st_mtime); + target_st->target_st_ctime = tswapl(st.st_ctime); } } break; @@ -1644,17 +1941,17 @@ unsigned int nfds = arg2; int timeout = arg3; struct pollfd *pfd; - int i; + unsigned int i;
pfd = alloca(sizeof(struct pollfd) * nfds); for(i = 0; i < nfds; i++) { - pfd->fd = tswap32(target_pfd->fd); - pfd->events = tswap16(target_pfd->events); + pfd[i].fd = tswap32(target_pfd[i].fd); + pfd[i].events = tswap16(target_pfd[i].events); } ret = get_errno(poll(pfd, nfds, timeout)); if (!is_error(ret)) { for(i = 0; i < nfds; i++) { - target_pfd->revents = tswap16(pfd->revents); + target_pfd[i].revents = tswap16(pfd[i].revents); } } } @@ -1859,9 +2156,9 @@ target_st->st_size = tswapl(st.st_size); target_st->st_blksize = tswapl(st.st_blksize); target_st->st_blocks = tswapl(st.st_blocks); - target_st->st_atime = tswapl(st.st_atime); - target_st->st_mtime = tswapl(st.st_mtime); - target_st->st_ctime = tswapl(st.st_ctime); + target_st->target_st_atime = tswapl(st.st_atime); + target_st->target_st_mtime = tswapl(st.st_mtime); + target_st->target_st_ctime = tswapl(st.st_ctime); } } break; diff -ur qemu-0.1.2/syscall_defs.h qemu-0.1.2-s390/syscall_defs.h --- qemu-0.1.2/syscall_defs.h 2003-03-26 23:34:59.000000000 +0100 +++ qemu-0.1.2-s390/syscall_defs.h 2003-03-29 02:36:30.000000000 +0100 @@ -19,6 +19,11 @@ #define SOCKOP_sendmsg 16 #define SOCKOP_recvmsg 17
+struct target_sockaddr { + uint16_t sa_family; + uint8_t sa_data[14]; +}; + struct target_timeval { target_long tv_sec; target_long tv_usec; @@ -49,6 +54,43 @@ unsigned int msg_flags; };
+struct target_cmsghdr { + target_long cmsg_len; + int cmsg_level; + int cmsg_type; +}; + +#define TARGET_CMSG_DATA(cmsg) ((unsigned char *) ((struct target_cmsghdr *) (cmsg) + 1)) +#define TARGET_CMSG_NXTHDR(mhdr, cmsg) __target_cmsg_nxthdr (mhdr, cmsg) +#define TARGET_CMSG_FIRSTHDR(mhdr) \ + ((size_t) tswapl((mhdr)->msg_controllen) >= sizeof (struct target_cmsghdr) \ + ? (struct target_cmsghdr *) tswapl((mhdr)->msg_control) : (struct target_cmsghdr *) NULL) +#define TARGET_CMSG_ALIGN(len) (((len) + sizeof (target_long) - 1) \ + & (size_t) ~(sizeof (target_long) - 1)) +#define TARGET_CMSG_SPACE(len) (TARGET_CMSG_ALIGN (len) \ + + TARGET_CMSG_ALIGN (sizeof (struct target_cmsghdr))) +#define TARGET_CMSG_LEN(len) (TARGET_CMSG_ALIGN (sizeof (struct target_cmsghdr)) + (len)) + +static __inline__ struct target_cmsghdr * +__target_cmsg_nxthdr (struct target_msghdr *__mhdr, struct target_cmsghdr *__cmsg) +{ + if (tswapl(__cmsg->cmsg_len) < sizeof (struct target_cmsghdr)) + /* The kernel header does this so there may be a reason. */ + return 0; + + __cmsg = (struct target_cmsghdr *) ((unsigned char *) __cmsg + + TARGET_CMSG_ALIGN (tswapl(__cmsg->cmsg_len))); + if ((unsigned char *) (__cmsg + 1) > ((unsigned char *) tswapl(__mhdr->msg_control) + + tswapl(__mhdr->msg_controllen)) + || ((unsigned char *) __cmsg + TARGET_CMSG_ALIGN (tswapl(__cmsg->cmsg_len)) + > ((unsigned char *) tswapl(__mhdr->msg_control) + + tswapl(__mhdr->msg_controllen)))) + /* No more entries. */ + return 0; + return __cmsg; +} + + struct target_rusage { struct target_timeval ru_utime; /* user time used */ struct target_timeval ru_stime; /* system time used */