linux-user: Fix target_semid_ds structure definition

Commit Message

Peter Maydell July 15, 2016, 3:50 p.m. UTC

The target_semid_ds structure is not correct for all
architectures: the padding fields should only exist for:
 * 32-bit ABIs
 * x86

It is also misnamed, since it is following the kernel
semid64_ds structure (QEMU doesn't support the legacy
semid_ds structure at all). Rename the struct, provide
a correct generic definition and allow the oddball x86
architecture to provide its own version.

This fixes broken SYSV semaphores for all our 64-bit
architectures except x86 and ppc.

Signed-off-by: Peter Maydell <[e-mail]>
---
 linux-user/syscall.c               | 17 ++++++++++-------
 linux-user/x86_64/target_structs.h | 15 +++++++++++++++
 2 files changed, 25 insertions(+), 7 deletions(-)

Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 33b5cb6..0e87157 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -3406,27 +3406,30 @@  static struct shm_region {
     bool in_use;
 } shm_regions[N_SHM_REGIONS];
 
-struct target_semid_ds
+#ifndef TARGET_SEMID64_DS
+/* asm-generic version of this struct */
+struct target_semid64_ds
 {
   struct target_ipc_perm sem_perm;
   abi_ulong sem_otime;
-#if !defined(TARGET_PPC64)
+#if TARGET_ABI_BITS == 32
   abi_ulong __unused1;
 #endif
   abi_ulong sem_ctime;
-#if !defined(TARGET_PPC64)
+#if TARGET_ABI_BITS == 32
   abi_ulong __unused2;
 #endif
   abi_ulong sem_nsems;
   abi_ulong __unused3;
   abi_ulong __unused4;
 };
+#endif
 
 static inline abi_long target_to_host_ipc_perm(struct ipc_perm *host_ip,
                                                abi_ulong target_addr)
 {
     struct target_ipc_perm *target_ip;
-    struct target_semid_ds *target_sd;
+    struct target_semid64_ds *target_sd;
 
     if (!lock_user_struct(VERIFY_READ, target_sd, target_addr, 1))
         return -TARGET_EFAULT;
@@ -3454,7 +3457,7 @@  static inline abi_long host_to_target_ipc_perm(abi_ulong target_addr,
                                                struct ipc_perm *host_ip)
 {
     struct target_ipc_perm *target_ip;
-    struct target_semid_ds *target_sd;
+    struct target_semid64_ds *target_sd;
 
     if (!lock_user_struct(VERIFY_WRITE, target_sd, target_addr, 0))
         return -TARGET_EFAULT;
@@ -3481,7 +3484,7 @@  static inline abi_long host_to_target_ipc_perm(abi_ulong target_addr,
 static inline abi_long target_to_host_semid_ds(struct semid_ds *host_sd,
                                                abi_ulong target_addr)
 {
-    struct target_semid_ds *target_sd;
+    struct target_semid64_ds *target_sd;
 
     if (!lock_user_struct(VERIFY_READ, target_sd, target_addr, 1))
         return -TARGET_EFAULT;
@@ -3497,7 +3500,7 @@  static inline abi_long target_to_host_semid_ds(struct semid_ds *host_sd,
 static inline abi_long host_to_target_semid_ds(abi_ulong target_addr,
                                                struct semid_ds *host_sd)
 {
-    struct target_semid_ds *target_sd;
+    struct target_semid64_ds *target_sd;
 
     if (!lock_user_struct(VERIFY_WRITE, target_sd, target_addr, 0))
         return -TARGET_EFAULT;
diff --git a/linux-user/x86_64/target_structs.h b/linux-user/x86_64/target_structs.h
index 3489827..b6e82a8 100644
--- a/linux-user/x86_64/target_structs.h
+++ b/linux-user/x86_64/target_structs.h
@@ -55,4 +55,19 @@  struct target_shmid_ds {
     abi_ulong __unused5;
 };
 
+/* The x86 definition differs from the generic one in that the
+ * two padding fields exist whether the ABI is 32 bits or 64 bits.
+ */
+#define TARGET_SEMID64_DS
+struct target_semid64_ds {
+    struct target_ipc_perm sem_perm;
+    abi_ulong sem_otime;
+    abi_ulong __unused1;
+    abi_ulong sem_ctime;
+    abi_ulong __unused2;
+    abi_ulong sem_nsems;
+    abi_ulong __unused3;
+    abi_ulong __unused4;
+};
+
 #endif