siginfo: add signal info for seccomp related SIGSYS

uClibc doesn't define signal info for the SIGSYS signal which is issued
in case of hitting a syscall prohibited by seccomp.
This is sad as it makes debugging seccomp filter policies impossible on
some architectures (at least ARM and PowerPC, maybe also others) which
do not coincidentally set si_value.sival_int as the syscall number.

To fix this, import the definitions and macros needed from glibc.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/alpha/bits/siginfo.h

@@ -97,6 +97,14 @@ typedef struct siginfo
 	    int si_band;	/* Band event for SIGPOLL.  */
 	    int si_fd;
 	  } _sigpoll;
+
+	/* SIGSYS.  */
+	struct
+	  {
+	    void *_call_addr;   /* Calling user insn.  */
+	    int _syscall;       /* Triggering system call number.  */
+	    unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
+	  } _sigsys;
       } _sifields;
   } siginfo_t;
 
@@ -115,6 +123,9 @@ typedef struct siginfo
 # define si_addr	_sifields._sigfault.si_addr
 # define si_band	_sifields._sigpoll.si_band
 # define si_fd		_sifields._sigpoll.si_fd
+# define si_call_addr	_sifields._sigsys._call_addr
+# define si_syscall	_sifields._sigsys._syscall
+# define si_arch	_sifields._sigsys._arch
 
 
 /* Values for `si_code'.  Positive values are reserved for kernel-generated

libc/sysdeps/linux/common/bits/siginfo.h

@@ -103,6 +103,14 @@ typedef struct siginfo
 	    long int si_band;	/* Band event for SIGPOLL.  */
 	    int si_fd;
 	  } _sigpoll;
+
+	/* SIGSYS.  */
+	struct
+	  {
+	    void *_call_addr;   /* Calling user insn.  */
+	    int _syscall;       /* Triggering system call number.  */
+	    unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
+	  } _sigsys;
       } _sifields;
   } siginfo_t;
 
@@ -121,6 +129,9 @@ typedef struct siginfo
 # define si_addr	_sifields._sigfault.si_addr
 # define si_band	_sifields._sigpoll.si_band
 # define si_fd		_sifields._sigpoll.si_fd
+# define si_call_addr	_sifields._sigsys._call_addr
+# define si_syscall	_sifields._sigsys._syscall
+# define si_arch	_sifields._sigsys._arch
 
 
 /* Values for `si_code'.  Positive values are reserved for kernel-generated

libc/sysdeps/linux/ia64/bits/siginfo.h

@@ -102,6 +102,14 @@ typedef struct siginfo
 	    long int si_band;	/* Band event for SIGPOLL.  */
 	    int si_fd;
 	  } _sigpoll;
+
+	/* SIGSYS.  */
+	struct
+	  {
+	    void *_call_addr;   /* Calling user insn.  */
+	    int _syscall;       /* Triggering system call number.  */
+	    unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
+	  } _sigsys;
       } _sifields;
   } siginfo_t;
 
@@ -120,6 +128,9 @@ typedef struct siginfo
 # define si_addr	_sifields._sigfault.si_addr
 # define si_band	_sifields._sigpoll.si_band
 # define si_fd		_sifields._sigpoll.si_fd
+# define si_call_addr	_sifields._sigsys._call_addr
+# define si_syscall	_sifields._sigsys._syscall
+# define si_arch	_sifields._sigsys._arch
 
 # ifdef __USE_GNU
 #  define si_imm	_sifields._sigfault._si_imm

libc/sysdeps/linux/mips/bits/siginfo.h

@@ -108,6 +108,14 @@ typedef struct siginfo
 	    long int si_band;	/* Band event for SIGPOLL.  */
 	    int si_fd;
 	  } _sigpoll;
+
+	/* SIGSYS.  */
+	struct
+	  {
+	    void *_call_addr;   /* Calling user insn.  */
+	    int _syscall;       /* Triggering system call number.  */
+	    unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
+	  } _sigsys;
       } _sifields;
   } siginfo_t;
 
@@ -127,6 +135,9 @@ typedef struct siginfo
 # define si_addr_lsb	_sifields._sigfault.si_addr_lsb
 # define si_band	_sifields._sigpoll.si_band
 # define si_fd		_sifields._sigpoll.si_fd
+# define si_call_addr	_sifields._sigsys._call_addr
+# define si_syscall	_sifields._sigsys._syscall
+# define si_arch	_sifields._sigsys._arch
 
 
 /* Values for `si_code'.  Positive values are reserved for kernel-generated

libc/sysdeps/linux/sparc/bits/siginfo.h

@@ -104,6 +104,14 @@ typedef struct siginfo
 	    int si_band;	/* Band event for SIGPOLL.  */
 	    int si_fd;
 	  } _sigpoll;
+
+	/* SIGSYS.  */
+	struct
+	  {
+	    void *_call_addr;   /* Calling user insn.  */
+	    int _syscall;       /* Triggering system call number.  */
+	    unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
+	  } _sigsys;
       } _sifields;
   } siginfo_t;
 
@@ -123,6 +131,9 @@ typedef struct siginfo
 # define si_trapno	_sifields._sigfault.si_trapno
 # define si_band	_sifields._sigpoll.si_band
 # define si_fd		_sifields._sigpoll.si_fd
+# define si_call_addr	_sifields._sigsys._call_addr
+# define si_syscall	_sifields._sigsys._syscall
+# define si_arch	_sifields._sigsys._arch
 
 
 /* Values for `si_code'.  Positive values are reserved for kernel-generated