Bug 21053: sh: Reduce namespace pollution from sys/ucontext.h

The problem is basically that sys/ucontext.h is defining R0..R15
which happens to conflict with some packages like Firefox when
trying to build on SH.

The very same problem existed on arm back then [1] and it was fixed by
renaming R0..R15 to REG_R0..REG_R15.  This patch imploy a similar
strategy for SH.

Checked on sh4-linux-gnu with run-built-tests=no and I also got reports
that it fixes Firefox build on Debian sh4.

	* sysdeps/unix/sysv/linux/sh/sh3/ucontext_i.sym: Use new REG_R*
	constants instead of the old R* ones.
	* sysdeps/unix/sysv/linux/sh/sh4/ucontext_i.sym: Likewise.
	* sysdeps/unix/sysv/linux/sh/sys/ucontext.h (NGPREG): Rename...
	(NGREG): ... to this, to fit in with other architectures.
	(gpregset_t): Use new NGREG macro.
	[__USE_GNU]: Remove condition; all architectures other than tile
	are unconditional.
	(R*): Rename to REG_R*.

(cherry picked from commit 3e1b518550634792de13332edaab0ad722322c2b)

4 files changed, 78 insertions, 68 deletions

diff --git a/ChangeLog b/ChangeLog
index 178ffca243..e2d55512c4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2017-01-24  James Clarke  <jrtc27@jrtc27.com>
+
+	* sysdeps/unix/sysv/linux/sh/sh3/ucontext_i.sym: Use new REG_R*
+	constants instead of the old R* ones.
+	* sysdeps/unix/sysv/linux/sh/sh4/ucontext_i.sym: Likewise.
+	* sysdeps/unix/sysv/linux/sh/sys/ucontext.h (NGPREG): Rename...
+	(NGREG): ... to this, to fit in with other architectures.
+	(gpregset_t): Use new NGREG macro.
+	[__USE_GNU]: Remove condition; all architectures other than tile
+	are unconditional.
+	(R*): Rename to REG_R*.
+
 2017-07-26  H.J. Lu  <hongjiu.lu@intel.com>
 
 	[BZ #21666]
diff --git a/sysdeps/unix/sysv/linux/sh/sh3/ucontext_i.sym b/sysdeps/unix/sysv/linux/sh/sh3/ucontext_i.sym
index 17397c5511..25f914a93b 100644
--- a/sysdeps/unix/sysv/linux/sh/sh3/ucontext_i.sym
+++ b/sysdeps/unix/sysv/linux/sh/sh3/ucontext_i.sym
@@ -13,22 +13,22 @@ SIG_SETMASK
 oLINK		ucontext (uc_link)
 oSS_SP		ucontext (uc_stack.ss_sp)
 oSS_SIZE	ucontext (uc_stack.ss_size)
-oR0		mcontext (gregs[R0])
-oR1		mcontext (gregs[R1])
-oR2		mcontext (gregs[R2])
-oR3		mcontext (gregs[R3])
-oR4		mcontext (gregs[R4])
-oR5		mcontext (gregs[R5])
-oR6		mcontext (gregs[R6])
-oR7		mcontext (gregs[R7])
-oR8		mcontext (gregs[R8])
-oR9		mcontext (gregs[R9])
-oR10		mcontext (gregs[R10])
-oR11		mcontext (gregs[R11])
-oR12		mcontext (gregs[R12])
-oR13		mcontext (gregs[R13])
-oR14		mcontext (gregs[R14])
-oR15		mcontext (gregs[R15])
+oR0		mcontext (gregs[REG_R0])
+oR1		mcontext (gregs[REG_R1])
+oR2		mcontext (gregs[REG_R2])
+oR3		mcontext (gregs[REG_R3])
+oR4		mcontext (gregs[REG_R4])
+oR5		mcontext (gregs[REG_R5])
+oR6		mcontext (gregs[REG_R6])
+oR7		mcontext (gregs[REG_R7])
+oR8		mcontext (gregs[REG_R8])
+oR9		mcontext (gregs[REG_R9])
+oR10		mcontext (gregs[REG_R10])
+oR11		mcontext (gregs[REG_R11])
+oR12		mcontext (gregs[REG_R12])
+oR13		mcontext (gregs[REG_R13])
+oR14		mcontext (gregs[REG_R14])
+oR15		mcontext (gregs[REG_R15])
 oPC		mcontext (pc)
 oPR		mcontext (pr)
 oSR		mcontext (sr)
diff --git a/sysdeps/unix/sysv/linux/sh/sh4/ucontext_i.sym b/sysdeps/unix/sysv/linux/sh/sh4/ucontext_i.sym
index 65633fbcf4..130f60cd96 100644
--- a/sysdeps/unix/sysv/linux/sh/sh4/ucontext_i.sym
+++ b/sysdeps/unix/sysv/linux/sh/sh4/ucontext_i.sym
@@ -13,22 +13,22 @@ SIG_SETMASK
 oLINK		ucontext (uc_link)
 oSS_SP		ucontext (uc_stack.ss_sp)
 oSS_SIZE	ucontext (uc_stack.ss_size)
-oR0		mcontext (gregs[R0])
-oR1		mcontext (gregs[R1])
-oR2		mcontext (gregs[R2])
-oR3		mcontext (gregs[R3])
-oR4		mcontext (gregs[R4])
-oR5		mcontext (gregs[R5])
-oR6		mcontext (gregs[R6])
-oR7		mcontext (gregs[R7])
-oR8		mcontext (gregs[R8])
-oR9		mcontext (gregs[R9])
-oR10		mcontext (gregs[R10])
-oR11		mcontext (gregs[R11])
-oR12		mcontext (gregs[R12])
-oR13		mcontext (gregs[R13])
-oR14		mcontext (gregs[R14])
-oR15		mcontext (gregs[R15])
+oR0		mcontext (gregs[REG_R0])
+oR1		mcontext (gregs[REG_R1])
+oR2		mcontext (gregs[REG_R2])
+oR3		mcontext (gregs[REG_R3])
+oR4		mcontext (gregs[REG_R4])
+oR5		mcontext (gregs[REG_R5])
+oR6		mcontext (gregs[REG_R6])
+oR7		mcontext (gregs[REG_R7])
+oR8		mcontext (gregs[REG_R8])
+oR9		mcontext (gregs[REG_R9])
+oR10		mcontext (gregs[REG_R10])
+oR11		mcontext (gregs[REG_R11])
+oR12		mcontext (gregs[REG_R12])
+oR13		mcontext (gregs[REG_R13])
+oR14		mcontext (gregs[REG_R14])
+oR15		mcontext (gregs[REG_R15])
 oPC		mcontext (pc)
 oPR		mcontext (pr)
 oSR		mcontext (sr)
diff --git a/sysdeps/unix/sysv/linux/sh/sys/ucontext.h b/sysdeps/unix/sysv/linux/sh/sys/ucontext.h
index ab9a7e66bf..037fbb73e8 100644
--- a/sysdeps/unix/sysv/linux/sh/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/sh/sys/ucontext.h
@@ -31,49 +31,47 @@
 typedef int greg_t;
 
 /* Number of general registers.  */
-#define NGPREG	16
+#define NGREG	16
 
 /* Container for all general registers.  */
-typedef greg_t gregset_t[NGPREG];
+typedef greg_t gregset_t[NGREG];
 
-#ifdef __USE_GNU
 /* Number of each register is the `gregset_t' array.  */
 enum
 {
-  R0 = 0,
-#define R0	R0
-  R1 = 1,
-#define R1	R1
-  R2 = 2,
-#define R2	R2
-  R3 = 3,
-#define R3	R3
-  R4 = 4,
-#define R4	R4
-  R5 = 5,
-#define R5	R5
-  R6 = 6,
-#define R6	R6
-  R7 = 7,
-#define R7	R7
-  R8 = 8,
-#define R8	R8
-  R9 = 9,
-#define R9	R9
-  R10 = 10,
-#define R10	R10
-  R11 = 11,
-#define R11	R11
-  R12 = 12,
-#define R12	R12
-  R13 = 13,
-#define R13	R13
-  R14 = 14,
-#define R14	R14
-  R15 = 15,
-#define R15	R15
+  REG_R0 = 0,
+#define REG_R0	REG_R0
+  REG_R1 = 1,
+#define REG_R1	REG_R1
+  REG_R2 = 2,
+#define REG_R2	REG_R2
+  REG_R3 = 3,
+#define REG_R3	REG_R3
+  REG_R4 = 4,
+#define REG_R4	REG_R4
+  REG_R5 = 5,
+#define REG_R5	REG_R5
+  REG_R6 = 6,
+#define REG_R6	REG_R6
+  REG_R7 = 7,
+#define REG_R7	REG_R7
+  REG_R8 = 8,
+#define REG_R8	REG_R8
+  REG_R9 = 9,
+#define REG_R9	REG_R9
+  REG_R10 = 10,
+#define REG_R10	REG_R10
+  REG_R11 = 11,
+#define REG_R11	REG_R11
+  REG_R12 = 12,
+#define REG_R12	REG_R12
+  REG_R13 = 13,
+#define REG_R13	REG_R13
+  REG_R14 = 14,
+#define REG_R14	REG_R14
+  REG_R15 = 15,
+#define REG_R15	REG_R15
 };
-#endif
 
 #if (defined(__SH4__) || defined(__SH4A__))
 typedef int freg_t;