arch/mips/include/uapi/asm/ucontext.h

   1 #ifndef __MIPS_UAPI_ASM_UCONTEXT_H
   2 #define __MIPS_UAPI_ASM_UCONTEXT_H
   3
   4 /**
   5  * struct extcontext - extended context header structure
   6  * @magic:      magic value identifying the type of extended context
   7  * @size:       the size in bytes of the enclosing structure
   8  *
   9  * Extended context structures provide context which does not fit within struct
  10  * sigcontext. They are placed sequentially in memory at the end of struct
  11  * ucontext and struct sigframe, with each extended context structure beginning
  12  * with a header defined by this struct. The type of context represented is
  13  * indicated by the magic field. Userland may check each extended context
  14  * structure against magic values that it recognises. The size field allows any
  15  * unrecognised context to be skipped, allowing for future expansion. The end
  16  * of the extended context data is indicated by the magic value
  17  * END_EXTCONTEXT_MAGIC.
  18  */
  19 struct extcontext {
  20         unsigned int            magic;
  21         unsigned int            size;
  22 };
  23
  24 /**
  25  * struct msa_extcontext - MSA extended context structure
  26  * @ext:        the extended context header, with magic == MSA_EXTCONTEXT_MAGIC
  27  * @wr:         the most significant 64 bits of each MSA vector register
  28  * @csr:        the value of the MSA control & status register
  29  *
  30  * If MSA context is live for a task at the time a signal is delivered to it,
  31  * this structure will hold the MSA context of the task as it was prior to the
  32  * signal delivery.
  33  */
  34 struct msa_extcontext {
  35         struct extcontext       ext;
  36 #define MSA_EXTCONTEXT_MAGIC    0x784d5341      /* xMSA */
  37
  38         unsigned long long      wr[32];
  39         unsigned int            csr;
  40 };
  41
  42 #define END_EXTCONTEXT_MAGIC    0x78454e44      /* xEND */
  43
  44 /**
  45  * struct ucontext - user context structure
  46  * @uc_flags:
  47  * @uc_link:
  48  * @uc_stack:
  49  * @uc_mcontext:        holds basic processor state
  50  * @uc_sigmask:
  51  * @uc_extcontext:      holds extended processor state
  52  */
  53 struct ucontext {
  54         /* Historic fields matching asm-generic */
  55         unsigned long           uc_flags;
  56         struct ucontext         *uc_link;
  57         stack_t                 uc_stack;
  58         struct sigcontext       uc_mcontext;
  59         sigset_t                uc_sigmask;
  60
  61         /* Extended context structures may follow ucontext */
  62         unsigned long long      uc_extcontext[0];
  63 };
  64
  65 #endif /* __MIPS_UAPI_ASM_UCONTEXT_H */