text: #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
   || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
  
  #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
  #define MINSIGSTKSZ 6144
  #define SIGSTKSZ 12288
  #endif
  
  #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
  typedef unsigned long greg_t;
  typedef unsigned long gregset_t[34];
  
  typedef struct {
  	TASELDOUBLE vregs[32];
  	unsigned int fpsr;
  	unsigned int fpcr;
  } fpregset_t;
  typedef struct sigcontext {
  	unsigned long fault_address;
  	unsigned long regs[31];
  	unsigned long sp, pc, pstate;
  	TASELDOUBLE __reserved[256];
  } mcontext_t;
  
  #define FPSIMD_MAGIC 0x46508001
  #define ESR_MAGIC 0x45535201
  #define EXTRA_MAGIC 0x45585401
  #define SVE_MAGIC 0x53564501
  struct _aarch64_ctx {
  	unsigned int magic;
  	unsigned int size;
  };
  struct fpsimd_context {
  	struct _aarch64_ctx head;
  	unsigned int fpsr;
  	unsigned int fpcr;
  	TASELDOUBLE vregs[32];
  };
  struct esr_context {
  	struct _aarch64_ctx head;
  	unsigned long esr;
  };
  struct extra_context {
  	struct _aarch64_ctx head;
  	unsigned long datap;
  	unsigned int size;
  	unsigned int __reserved[3];
  };
  struct sve_context {
  	struct _aarch64_ctx head;
  	unsigned short vl;
  	unsigned short __reserved[3];
  };
  #define SVE_VQ_BYTES		16
  #define SVE_VQ_MIN		1
  #define SVE_VQ_MAX		512
  #define SVE_VL_MIN		(SVE_VQ_MIN * SVE_VQ_BYTES)
  #define SVE_VL_MAX		(SVE_VQ_MAX * SVE_VQ_BYTES)
  #define SVE_NUM_ZREGS		32
  #define SVE_NUM_PREGS		16
  #define sve_vl_valid(vl) \
  	((vl) % SVE_VQ_BYTES == 0 && (vl) >= SVE_VL_MIN && (vl) <= SVE_VL_MAX)
  #define sve_vq_from_vl(vl)	((vl) / SVE_VQ_BYTES)
  #define sve_vl_from_vq(vq)	((vq) * SVE_VQ_BYTES)
  #define SVE_SIG_ZREG_SIZE(vq)	((unsigned)(vq) * SVE_VQ_BYTES)
  #define SVE_SIG_PREG_SIZE(vq)	((unsigned)(vq) * (SVE_VQ_BYTES / 8))
  #define SVE_SIG_FFR_SIZE(vq)	SVE_SIG_PREG_SIZE(vq)
  #define SVE_SIG_REGS_OFFSET					\
  	((sizeof(struct sve_context) + (SVE_VQ_BYTES - 1))	\
  		/ SVE_VQ_BYTES * SVE_VQ_BYTES)
  #define SVE_SIG_ZREGS_OFFSET	SVE_SIG_REGS_OFFSET
  #define SVE_SIG_ZREG_OFFSET(vq, n) \
  	(SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREG_SIZE(vq) * (n))
  #define SVE_SIG_ZREGS_SIZE(vq) \
  	(SVE_SIG_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_SIG_ZREGS_OFFSET)
  #define SVE_SIG_PREGS_OFFSET(vq) \
  	(SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREGS_SIZE(vq))
  #define SVE_SIG_PREG_OFFSET(vq, n) \
  	(SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREG_SIZE(vq) * (n))
  #define SVE_SIG_PREGS_SIZE(vq) \
  	(SVE_SIG_PREG_OFFSET(vq, SVE_NUM_PREGS) - SVE_SIG_PREGS_OFFSET(vq))
  #define SVE_SIG_FFR_OFFSET(vq) \
  	(SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREGS_SIZE(vq))
  #define SVE_SIG_REGS_SIZE(vq) \
  	(SVE_SIG_FFR_OFFSET(vq) + SVE_SIG_FFR_SIZE(vq) - SVE_SIG_REGS_OFFSET)
  #define SVE_SIG_CONTEXT_SIZE(vq) (SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq))
  #else
  typedef struct {
  	TASELDOUBLE __regs[18+256];
  } mcontext_t;
  #endif
  
  struct sigaltstack {
  	void *ss_sp;
  	int ss_flags;
  	size_t ss_size;
  };
  
  typedef struct __ucontext {
  	unsigned long uc_flags;
  	struct __ucontext *uc_link;
  	stack_t uc_stack;
  	sigset_t uc_sigmask;
  	mcontext_t uc_mcontext;
  } ucontext_t;
  
  #define SA_NOCLDSTOP  1
  #define SA_NOCLDWAIT  2
  #define SA_SIGINFO    4
  #define SA_ONSTACK    0x08000000
  #define SA_RESTART    0x10000000
  #define SA_NODEFER    0x40000000
  #define SA_RESETHAND  0x80000000
  #define SA_RESTORER   0x04000000
  
  #endif
  
  #define SIGHUP    1
  #define SIGINT    2
  #define SIGQUIT   3
  #define SIGILL    4
  #define SIGTRAP   5
  #define SIGABRT   6
  #define SIGIOT    SIGABRT
  #define SIGBUS    7
  #define SIGFPE    8
  #define SIGKILL   9
  #define SIGUSR1   10
  #define SIGSEGV   11
  #define SIGUSR2   12
  #define SIGPIPE   13
  #define SIGALRM   14
  #define SIGTERM   15
  #define SIGSTKFLT 16
  #define SIGCHLD   17
  #define SIGCONT   18
  #define SIGSTOP   19
  #define SIGTSTP   20
  #define SIGTTIN   21
  #define SIGTTOU   22
  #define SIGURG    23
  #define SIGXCPU   24
  #define SIGXFSZ   25
  #define SIGVTALRM 26
  #define SIGPROF   27
  #define SIGWINCH  28
  #define SIGIO     29
  #define SIGPOLL   29
  #define SIGPWR    30
  #define SIGSYS    31
  #define SIGUNUSED SIGSYS
  
  #define _NSIG 65
  