powerpc: merge sigcontext.h

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 52 insertions, 0 deletions

diff --git a/include/asm-powerpc/sigcontext.h b/include/asm-powerpc/sigcontext.h
new file mode 100644
index 000000000000..165d630e1cf3
--- /dev/null
+++ b/include/asm-powerpc/sigcontext.h
@@ -0,0 +1,52 @@
+#ifndef _ASM_POWERPC_SIGCONTEXT_H
+#define _ASM_POWERPC_SIGCONTEXT_H
+
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/compiler.h>
+#include <asm/ptrace.h>
+#ifdef __powerpc64__
+#include <asm/elf.h>
+#endif
+
+struct sigcontext {
+        unsigned long   _unused[4];
+        int             signal;
+#ifdef __powerpc64__
+        int             _pad0;
+#endif
+        unsigned long   handler;
+        unsigned long   oldmask;
+        struct pt_regs  __user *regs;
+#ifdef __powerpc64__
+        elf_gregset_t   gp_regs;
+        elf_fpregset_t  fp_regs;
+/*
+ * To maintain compatibility with current implementations the sigcontext is
+ * extended by appending a pointer (v_regs) to a quadword type (elf_vrreg_t)
+ * followed by an unstructured (vmx_reserve) field of 69 doublewords.  This
+ * allows the array of vector registers to be quadword aligned independent of
+ * the alignment of the containing sigcontext or ucontext. It is the
+ * responsibility of the code setting the sigcontext to set this pointer to
+ * either NULL (if this processor does not support the VMX feature) or the
+ * address of the first quadword within the allocated (vmx_reserve) area.
+ *
+ * The pointer (v_regs) of vector type (elf_vrreg_t) is type compatible with
+ * an array of 34 quadword entries (elf_vrregset_t).  The entries with
+ * indexes 0-31 contain the corresponding vector registers.  The entry with
+ * index 32 contains the vscr as the last word (offset 12) within the
+ * quadword.  This allows the vscr to be stored as either a quadword (since
+ * it must be copied via a vector register to/from storage) or as a word.
+ * The entry with index 33 contains the vrsave as the first word (offset 0)
+ * within the quadword.
+ */
+        elf_vrreg_t     __user *v_regs;
+        long            vmx_reserve[ELF_NVRREG+ELF_NVRREG+1];
+#endif
+};
+
+#endif /* _ASM_POWERPC_SIGCONTEXT_H */