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authorPeter Maydell <peter.maydell@linaro.org>2013-07-16 18:44:57 +0100
committerRiku Voipio <riku.voipio@linaro.org>2013-07-22 21:54:36 +0300
commit4ce6243dc6216e35b5b691078ffa856463bfa8db (patch)
tree766e18e8257a50fa1aead446fe6178be9b9c4f56 /linux-user/sparc64/syscall.h
parentd312bbe1051fa563b557de625ca57a466772abe5 (diff)
linux-user: Clean up handling of clone() argument order
Linux manages to have three separate orderings of the arguments to the clone() syscall on different architectures. In the kernel these are selected via CONFIG_CLONE_BACKWARDS and CONFIG_CLONE_BACKWARDS2. Clean up our implementation of this to use similar #define names rather than a TARGET_* ifdef ladder. This includes behaviour changes fixing bugs on cris, x86-64, m68k, openrisc and unicore32. cris had explicit but wrong handling; the others were just incorrectly using QEMU's default, which happened to be the equivalent of CONFIG_CLONE_BACKWARDS. (unicore32 appears to be broken in the mainline kernel in that it tries to use arg3 for both parent_tidptr and newtls simultaneously -- we don't attempt to emulate this bug...) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user/sparc64/syscall.h')
-rw-r--r--linux-user/sparc64/syscall.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/linux-user/sparc64/syscall.h b/linux-user/sparc64/syscall.h
index 81a816de94..e60bf311c0 100644
--- a/linux-user/sparc64/syscall.h
+++ b/linux-user/sparc64/syscall.h
@@ -8,3 +8,10 @@ struct target_pt_regs {
};
#define UNAME_MACHINE "sun4u"
+
+/* SPARC kernels don't define this in their Kconfig, but they have the
+ * same ABI as if they did, implemented by sparc-specific code which fishes
+ * directly in the u_regs() struct for half the parameters in sparc_do_fork()
+ * and copy_thread().
+ */
+#define TARGET_CLONE_BACKWARDS