Fix more namespace issues in sys/ucontext.h (bug 21457).

Continuing the fixes for namespace issues in sys/ucontext.h, this
patch moves various symbols into the implementation namespace in the
absence of __USE_MISC.  As with previous changes, it is nonexhaustive,
just covering more straightforward cases.

Structure fields are generally changed to have a prefix __ in the
absence of __USE_MISC, via a macro __ctx (used without a space before
the open parenthesis, since the result is a single identifier).
Various macros such as NGREG also have leading __ added.  No changes
are made to structure tags (and thus to C++ name mangling), except
that in the (unused) file sysdeps/i386/sys/ucontext.h, structures
defined inside other structures as the type for a field have their
tags removed in the non-__USE_MISC case (those structure tags would
not in any case have been visible in C++, because in C++ the scope of
such a tag is limited to the containing structure).  No changes are
made to the contents of bits/sigcontext.h, or to whether it is
included.  Because of remaining namespace issues, this patch does not
yet fix the bug or allow any XFAILs to be removed.

Tested for x86_64 and x86, and with build-many-glibcs.py.

	[BZ #21457]
	* sysdeps/arm/sys/ucontext.h (NGREG): Rename to __NGREG and define
	NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(mcontext_t): Use __ctx in defining fields.
	* sysdeps/i386/sys/ucontext.h (NGREG): Rename to __NGREG and
	define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(__ctxt): Likewise.
	(fpregset_t): Use __ctx and __ctxt in defining fields.
	(mcontext_t): Likewise.
	* sysdeps/m68k/sys/ucontext.h (NGREG): Rename to __NGREG and
	define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(mcontext_t): Use __ctx in defining fields.
	* sysdeps/mips/sys/ucontext.h (NGREG): Rename to __NGREG and
	define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(fpregset_t): Use __ctx in defining fields.
	(mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/alpha/sys/ucontext.h (NGREG): Rename to
	__NGREG and define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(NFPREG): Rename to __NFPREG and define NFPREG to __NFPREG if
	[__USE_MISC].
	(fpregset_t): Define using __NFPREG.
	* sysdeps/unix/sysv/linux/m68k/sys/ucontext.h (NGREG): Rename to
	__NGREG and define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(fpregset_t): Use __ctx in defining fields.
	(mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/mips/sys/ucontext.h (NGREG): Rename to
	__NGREG and define NGREG to __NGREG if [__USE_MISC].
	(NFPREG): Rename to __NFPREG and define NFPREG to __NFPREG if
	[__USE_MISC].
	(gregset_t): Define using __NGREG.
	(__ctx): New macro.
	(fpregset_t): Use __ctx in defining fields.
	(mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/nios2/sys/ucontext.h (__ctx): New macro.
	(mcontext_t): Use __ctx in defining fields.
	* sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h (__ctx): New
	macro.
	[__WORDSIZE == 32] (NGREG): Rename to __NGREG and define NGREG to
	__NGREG if [__USE_MISC].
	[__WORDSIZE == 32] (gregset_t): Define using __NGREG.
	[__WORDSIZE == 32] (fpregset_t): Use __ctx in defining fields.
	(mcontext_t): Likewise.
	[__WORDSIZE != 32] (NGREG): Rename to __NGREG and define NGREG to
	__NGREG if [__USE_MISC].
	[__WORDSIZE != 32] (NFPREG): Rename to __NFPREG and define NFPREG
	to __NFPREG if [__USE_MISC].
	[__WORDSIZE != 32] (NVRREG): Rename to __NVRREG and define NVRREG
	to __NVRREG if [__USE_MISC].
	[__WORDSIZE != 32] (gregset_t): Define using __NGREG.
	[__WORDSIZE != 32] (fpregset_t): Define using __NFPREG.
	[__WORDSIZE != 32] (vscr_t): Use __ctx in defining fields.
	[__WORDSIZE != 32] (vrregset_t): Likewise.
	[__WORDSIZE != 32] (mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/s390/sys/ucontext.h (__ctx): New macro.
	(__psw_t): Use __ctx in defining fields.
	(NGREG): Rename to __NGREG and define NGREG to __NGREG if
	[__USE_MISC].
	(gregset_t): Define using __NGREG.
	(fpreg_t): Use __ctx in defining fields.
	(fpregset_t): Likewise.
	(mcontext_t): Likewise.
	* sysdeps/unix/sysv/linux/sh/sys/ucontext.h (NGREG): Rename to
	__NGREG and define NGREG to __NGREG if [__USE_MISC].
	(gregset_t): Define using __NGREG.
	(NFPREG): Rename to __NFPREG and define NFPREG to __NFPREG if
	[__USE_MISC].
	(fpregset_t): Define using __NFPREG.
	(__ctx): New macro.
	(mcontext_t): Use __ctx in defining fields.
	* sysdeps/unix/sysv/linux/x86/sys/ucontext.h (__ctx): New macro.
	[__x86_64__] (NGREG): Rename to __NGREG and define NGREG to
	__NGREG if [__USE_MISC].
	[__x86_64__] (gregset_t): Define using __NGREG.
	[__x86_64__] (struct _libc_fpxreg): Use __ctx in defining fields.
	[__x86_64__] (struct _libc_fpstate): Likewise.
	[__x86_64__] (mcontext_t): Likewise.
	[!__x86_64__] (NGREG): Rename to __NGREG and define NGREG to
	__NGREG if [__USE_MISC].
	[!__x86_64__] (gregset_t): Define using __NGREG.
	[!__x86_64__] (struct _libc_fpreg): Use __ctx in defining fields.
	[!__x86_64__] (struct _libc_fpstate): Likewise.
	[!__x86_64__] (mcontext_t): Likewise.

1 files changed, 44 insertions, 30 deletions

diff --git a/sysdeps/unix/sysv/linux/x86/sys/ucontext.h b/sysdeps/unix/sysv/linux/x86/sys/ucontext.h
index 92a698e4b4..5fd64bf801 100644
--- a/sysdeps/unix/sysv/linux/x86/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/x86/sys/ucontext.h
@@ -25,16 +25,25 @@
 #include <bits/types/stack_t.h>
 
 
+#ifdef __USE_MISC
+# define __ctx(fld) fld
+#else
+# define __ctx(fld) __ ## fld
+#endif
+
 #ifdef __x86_64__
 
 /* Type for general register.  */
 __extension__ typedef long long int greg_t;
 
 /* Number of general registers.  */
-#define NGREG	23
+#define __NGREG	23
+#ifdef __USE_MISC
+# define NGREG	__NGREG
+#endif
 
 /* Container for all general registers.  */
-typedef greg_t gregset_t[NGREG];
+typedef greg_t gregset_t[__NGREG];
 
 #ifdef __USE_GNU
 /* Number of each register in the `gregset_t' array.  */
@@ -91,8 +100,8 @@ enum
 
 struct _libc_fpxreg
 {
-  unsigned short int significand[4];
-  unsigned short int exponent;
+  unsigned short int __ctx(significand)[4];
+  unsigned short int __ctx(exponent);
   unsigned short int __glibc_reserved1[3];
 };
 
@@ -104,14 +113,14 @@ struct _libc_xmmreg
 struct _libc_fpstate
 {
   /* 64-bit FXSAVE format.  */
-  __uint16_t		cwd;
-  __uint16_t		swd;
-  __uint16_t		ftw;
-  __uint16_t		fop;
-  __uint64_t		rip;
-  __uint64_t		rdp;
-  __uint32_t		mxcsr;
-  __uint32_t		mxcr_mask;
+  __uint16_t		__ctx(cwd);
+  __uint16_t		__ctx(swd);
+  __uint16_t		__ctx(ftw);
+  __uint16_t		__ctx(fop);
+  __uint64_t		__ctx(rip);
+  __uint64_t		__ctx(rdp);
+  __uint32_t		__ctx(mxcsr);
+  __uint32_t		__ctx(mxcr_mask);
   struct _libc_fpxreg	_st[8];
   struct _libc_xmmreg	_xmm[16];
   __uint32_t		__glibc_reserved1[24];
@@ -123,9 +132,9 @@ typedef struct _libc_fpstate *fpregset_t;
 /* Context to describe whole processor state.  */
 typedef struct
   {
-    gregset_t gregs;
+    gregset_t __ctx(gregs);
     /* Note that fpregs is a pointer.  */
-    fpregset_t fpregs;
+    fpregset_t __ctx(fpregs);
     __extension__ unsigned long long __reserved1 [8];
 } mcontext_t;
 
@@ -146,10 +155,13 @@ typedef struct ucontext
 typedef int greg_t;
 
 /* Number of general registers.  */
-#define NGREG	19
+#define __NGREG	19
+#ifdef __USE_MISC
+# define NGREG	__NGREG
+#endif
 
 /* Container for all general registers.  */
-typedef greg_t gregset_t[NGREG];
+typedef greg_t gregset_t[__NGREG];
 
 #ifdef __USE_GNU
 /* Number of each register is the `gregset_t' array.  */
@@ -199,21 +211,21 @@ enum
 /* Definitions taken from the kernel headers.  */
 struct _libc_fpreg
 {
-  unsigned short int significand[4];
-  unsigned short int exponent;
+  unsigned short int __ctx(significand)[4];
+  unsigned short int __ctx(exponent);
 };
 
 struct _libc_fpstate
 {
-  unsigned long int cw;
-  unsigned long int sw;
-  unsigned long int tag;
-  unsigned long int ipoff;
-  unsigned long int cssel;
-  unsigned long int dataoff;
-  unsigned long int datasel;
+  unsigned long int __ctx(cw);
+  unsigned long int __ctx(sw);
+  unsigned long int __ctx(tag);
+  unsigned long int __ctx(ipoff);
+  unsigned long int __ctx(cssel);
+  unsigned long int __ctx(dataoff);
+  unsigned long int __ctx(datasel);
   struct _libc_fpreg _st[8];
-  unsigned long int status;
+  unsigned long int __ctx(status);
 };
 
 /* Structure to describe FPU registers.  */
@@ -222,12 +234,12 @@ typedef struct _libc_fpstate *fpregset_t;
 /* Context to describe whole processor state.  */
 typedef struct
   {
-    gregset_t gregs;
+    gregset_t __ctx(gregs);
     /* Due to Linux's history we have to use a pointer here.  The SysV/i386
        ABI requires a struct with the values.  */
-    fpregset_t fpregs;
-    unsigned long int oldmask;
-    unsigned long int cr2;
+    fpregset_t __ctx(fpregs);
+    unsigned long int __ctx(oldmask);
+    unsigned long int __ctx(cr2);
   } mcontext_t;
 
 /* Userlevel context.  */
@@ -243,4 +255,6 @@ typedef struct ucontext
 
 #endif /* !__x86_64__ */
 
+#undef __ctx
+
 #endif /* sys/ucontext.h */