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authorPeter Maydell <peter.maydell@linaro.org>2016-07-11 16:48:11 +0100
committerRiku Voipio <riku.voipio@linaro.org>2016-09-21 14:28:52 +0300
commitee8e76141b4dd00f8e97fda274876a17f9a46bbe (patch)
tree97fad83fed31bae2f164c1a525e13b468e12cfbc /linux-user/sparc
parent0ef9ea290ed9319cb788ea40be06dd18b32ba05a (diff)
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linux-user: Use correct target SHMLBA in shmat()
The shmat() handling needs to do target-specific handling of the attach address for shmat(): * if the SHM_RND flag is passed, the address is rounded down to a SHMLBA boundary * if SHM_RND is not passed, then the call is failed EINVAL if the address is not a multiple of SHMLBA Since SHMLBA is target-specific, we need to do this checking and rounding in QEMU and can't leave it up to the host syscall. Allow targets to define TARGET_FORCE_SHMLBA and provide a target_shmlba() function if appropriate, and update do_shmat() to honour them. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user/sparc')
-rw-r--r--linux-user/sparc/target_syscall.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/linux-user/sparc/target_syscall.h b/linux-user/sparc/target_syscall.h
index 326f674..f97aa6b 100644
--- a/linux-user/sparc/target_syscall.h
+++ b/linux-user/sparc/target_syscall.h
@@ -22,4 +22,20 @@ struct target_pt_regs {
#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
#define TARGET_MLOCKALL_MCL_FUTURE 0x4000
+/* For SPARC SHMLBA is determined at runtime in the kernel, and
+ * libc has to runtime-detect it using the hwcaps (see glibc
+ * sysdeps/unix/sysv/linux/sparc/getshmlba; we follow the same
+ * logic here, though we know we're not the sparc v9 64-bit case).
+ */
+#define TARGET_FORCE_SHMLBA
+
+static inline abi_ulong target_shmlba(CPUSPARCState *env)
+{
+ if (!(env->def->features & CPU_FEATURE_FLUSH)) {
+ return 64 * 1024;
+ } else {
+ return 256 * 1024;
+ }
+}
+
#endif /* SPARC_TARGET_SYSCALL_H */