include/asm-ppc64/sigcontext.h

   1 #ifndef _ASM_PPC64_SIGCONTEXT_H
   2 #define _ASM_PPC64_SIGCONTEXT_H
   3
   4 /*
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version
   8  * 2 of the License, or (at your option) any later version.
   9  */
  10 #include <linux/compiler.h>
  11 #include <asm/ptrace.h>
  12 #include <asm/elf.h>
  13
  14
  15 struct sigcontext {
  16         unsigned long   _unused[4];
  17         int             signal;
  18         int             _pad0;
  19         unsigned long   handler;
  20         unsigned long   oldmask;
  21         struct pt_regs  __user *regs;
  22         elf_gregset_t   gp_regs;
  23         elf_fpregset_t  fp_regs;
  24 /*
  25  * To maintain compatibility with current implementations the sigcontext is
  26  * extended by appending a pointer (v_regs) to a quadword type (elf_vrreg_t)
  27  * followed by an unstructured (vmx_reserve) field of 69 doublewords.  This
  28  * allows the array of vector registers to be quadword aligned independent of
  29  * the alignment of the containing sigcontext or ucontext. It is the
  30  * responsibility of the code setting the sigcontext to set this pointer to
  31  * either NULL (if this processor does not support the VMX feature) or the
  32  * address of the first quadword within the allocated (vmx_reserve) area.
  33  *
  34  * The pointer (v_regs) of vector type (elf_vrreg_t) is type compatible with
  35  * an array of 34 quadword entries (elf_vrregset_t).  The entries with
  36  * indexes 0-31 contain the corresponding vector registers.  The entry with
  37  * index 32 contains the vscr as the last word (offset 12) within the
  38  * quadword.  This allows the vscr to be stored as either a quadword (since
  39  * it must be copied via a vector register to/from storage) or as a word.
  40  * The entry with index 33 contains the vrsave as the first word (offset 0)
  41  * within the quadword.
  42  */
  43         elf_vrreg_t     __user *v_regs;
  44         long            vmx_reserve[ELF_NVRREG+ELF_NVRREG+1];
  45 };
  46
  47 #endif /* _ASM_PPC64_SIGCONTEXT_H */