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-rw-r--r--include/asm-arm/ucontext.h79
1 files changed, 78 insertions, 1 deletions
diff --git a/include/asm-arm/ucontext.h b/include/asm-arm/ucontext.h
index f853130137c..9e6f7ca9f5a 100644
--- a/include/asm-arm/ucontext.h
+++ b/include/asm-arm/ucontext.h
@@ -1,12 +1,89 @@
#ifndef _ASMARM_UCONTEXT_H
#define _ASMARM_UCONTEXT_H
+#include <asm/fpstate.h>
+
+/*
+ * struct sigcontext only has room for the basic registers, but struct
+ * ucontext now has room for all registers which need to be saved and
+ * restored. Coprocessor registers are stored in uc_regspace. Each
+ * coprocessor's saved state should start with a documented 32-bit magic
+ * number, followed by a 32-bit word giving the coproccesor's saved size.
+ * uc_regspace may be expanded if necessary, although this takes some
+ * coordination with glibc.
+ */
+
struct ucontext {
unsigned long uc_flags;
struct ucontext *uc_link;
stack_t uc_stack;
struct sigcontext uc_mcontext;
- sigset_t uc_sigmask; /* mask last for extensibility */
+ sigset_t uc_sigmask;
+ /* Allow for uc_sigmask growth. Glibc uses a 1024-bit sigset_t. */
+ int __unused[32 - (sizeof (sigset_t) / sizeof (int))];
+ /* Last for extensibility. Eight byte aligned because some
+ coprocessors require eight byte alignment. */
+ unsigned long uc_regspace[128] __attribute__((__aligned__(8)));
};
+#ifdef __KERNEL__
+
+/*
+ * Coprocessor save state. The magic values and specific
+ * coprocessor's layouts are part of the userspace ABI. Each one of
+ * these should be a multiple of eight bytes and aligned to eight
+ * bytes, to prevent unpredictable padding in the signal frame.
+ */
+
+#ifdef CONFIG_IWMMXT
+/* iwmmxt_area is 0x98 bytes long, preceeded by 8 bytes of signature */
+#define IWMMXT_MAGIC 0x12ef842a
+#define IWMMXT_STORAGE_SIZE (IWMMXT_SIZE + 8)
+
+struct iwmmxt_sigframe {
+ unsigned long magic;
+ unsigned long size;
+ struct iwmmxt_struct storage;
+} __attribute__((__aligned__(8)));
+#endif /* CONFIG_IWMMXT */
+
+#ifdef CONFIG_VFP
+#if __LINUX_ARM_ARCH__ < 6
+/* For ARM pre-v6, we use fstmiax and fldmiax. This adds one extra
+ * word after the registers, and a word of padding at the end for
+ * alignment. */
+#define VFP_MAGIC 0x56465001
+#define VFP_STORAGE_SIZE 152
+#else
+#define VFP_MAGIC 0x56465002
+#define VFP_STORAGE_SIZE 144
+#endif
+
+struct vfp_sigframe
+{
+ unsigned long magic;
+ unsigned long size;
+ union vfp_state storage;
+};
+#endif /* CONFIG_VFP */
+
+/*
+ * Auxiliary signal frame. This saves stuff like FP state.
+ * The layout of this structure is not part of the user ABI,
+ * because the config options aren't. uc_regspace is really
+ * one of these.
+ */
+struct aux_sigframe {
+#ifdef CONFIG_IWMMXT
+ struct iwmmxt_sigframe iwmmxt;
+#endif
+#if 0 && defined CONFIG_VFP /* Not yet saved. */
+ struct vfp_sigframe vfp;
+#endif
+ /* Something that isn't a valid magic number for any coprocessor. */
+ unsigned long end_magic;
+} __attribute__((__aligned__(8)));
+
+#endif
+
#endif /* !_ASMARM_UCONTEXT_H */