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authorPeter Maydell <peter.maydell@linaro.org>2016-09-06 10:36:42 +0100
committerPeter Maydell <peter.maydell@linaro.org>2016-09-06 10:36:52 +0100
commit73da9cb105dff3a04a4c24cdbe11c90d111bf866 (patch)
treed31bfcd50c08486852cd2e732b9c2c6786aa8a60
parentc5f04b490031eddf724fc4b9c51324bca62662d0 (diff)
downloadqemu-arm-linux-fixes.tar.gz
linux-user: Fix definition of target_sigevent for 32-bit guestslinux-fixes
The sigevent structure includes a union with some fields which are pointers. For the QEMU target_sigevent structure we must represent these as abi_ulongs, not host function pointers. This error was causing the compiler to believe it should 8-align the _sigev_un union on a 64-bit host, which meant that the code in target_to_host_sigevent() was looking at the wrong offset to find the _tid field, and timer_create() would spuriously fail with EINVAL. This fixes the final loose end noted in LP:1042388. While we're editing the structure, switch the 'int32_t' fields to 'abi_int'; this will only matter for guests with non-standard integer alignment like m68k. Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--linux-user/syscall_defs.h16
1 files changed, 10 insertions, 6 deletions
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index dbf6a38bd9..f4417ee601 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -2618,15 +2618,19 @@ typedef int32_t target_timer_t;
struct target_sigevent {
target_sigval_t sigev_value;
- int32_t sigev_signo;
- int32_t sigev_notify;
+ abi_int sigev_signo;
+ abi_int sigev_notify;
union {
- int32_t _pad[TARGET_SIGEV_PAD_SIZE];
- int32_t _tid;
+ abi_int _pad[TARGET_SIGEV_PAD_SIZE];
+ abi_int _tid;
+ /* The kernel (and thus QEMU) never looks at these;
+ * they're only used as part of the ABI between a
+ * userspace program and libc.
+ */
struct {
- void (*_function)(sigval_t);
- void *_attribute;
+ abi_ulong _function;
+ abi_ulong _attribute;
} _sigev_thread;
} _sigev_un;
};