Some mips updates. Add a couple of missing sys/*.h files and update a few others.

4 files changed, 673 insertions, 42 deletions

diff --git a/libc/sysdeps/linux/mips/sys/asm.h b/libc/sysdeps/linux/mips/sys/asm.h
new file mode 100644
index 000000000..76f6af3e1
--- /dev/null
+++ b/libc/sysdeps/linux/mips/sys/asm.h
@@ -0,0 +1,473 @@
+/* Copyright (C) 1997, 1998, 2002, 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ralf Baechle <ralf@gnu.org>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_ASM_H
+#define _SYS_ASM_H
+
+#include <sgidefs.h>
+
+#ifndef CAT
+# ifdef __STDC__
+#  define __CAT(str1,str2) str1##str2
+# else
+#  define __CAT(str1,str2) str1/**/str2
+# endif
+# define CAT(str1,str2) __CAT(str1,str2)
+#endif
+
+/*
+ * Macros to handle different pointer/register sizes for 32/64-bit code
+ *
+ * 64 bit address space isn't used yet, so we may use the R3000 32 bit
+ * defines for now.
+ */
+#if (_MIPS_SIM == _MIPS_SIM_ABI32) || (_MIPS_SIM == _MIPS_SIM_NABI32)
+# define PTR .word
+# define PTRSIZE 4
+# define PTRLOG 2
+#elif (_MIPS_SIM == _MIPS_SIM_ABI64)
+# define PTR .dword
+# define PTRSIZE 8
+# define PTRLOG 3
+#endif
+
+/*
+ * PIC specific declarations
+ */
+#if (_MIPS_SIM == _MIPS_SIM_ABI32)
+# ifdef __PIC__
+#  define CPRESTORE(register) \
+		.cprestore register
+#  define CPLOAD(register) \
+		.cpload register
+# else
+#  define CPRESTORE(register)
+#  define CPLOAD(register)
+# endif
+
+# define CPADD(register) \
+		.cpadd	register
+
+/*
+ * Set gp when at 1st instruction
+ */
+# define SETUP_GP					\
+		.set noreorder;				\
+		.cpload $25;				\
+		.set reorder
+/* Set gp when not at 1st instruction */
+# define SETUP_GPX(r)					\
+		.set noreorder;				\
+		move r, $31;	 /* Save old ra.  */	\
+		bal 10f; /* Find addr of cpload.  */	\
+		nop;					\
+10:							\
+		.cpload $31;				\
+		move $31, r;				\
+		.set reorder
+# define SETUP_GPX_L(r, l)				\
+		.set noreorder;				\
+		move r, $31;	 /* Save old ra.  */	\
+		bal l;   /* Find addr of cpload.  */	\
+		nop;					\
+l:							\
+		.cpload $31;				\
+		move $31, r;				\
+		.set reorder
+# define SAVE_GP(x) \
+		.cprestore x /* Save gp trigger t9/jalr conversion.	 */
+# define SETUP_GP64(a, b)
+# define SETUP_GPX64(a, b)
+# define SETUP_GPX64_L(cp_reg, ra_save, l)
+# define RESTORE_GP64
+# define USE_ALT_CP(a)
+#else /* (_MIPS_SIM == _MIPS_SIM_ABI64) || (_MIPS_SIM == _MIPS_SIM_NABI32) */
+/*
+ * For callee-saved gp calling convention:
+ */
+# define SETUP_GP
+# define SETUP_GPX(r)
+# define SETUP_GPX_L(r, l)
+# define SAVE_GP(x)
+
+# define SETUP_GP64(gpoffset, proc) \
+		.cpsetup $25, gpoffset, proc
+# define SETUP_GPX64(cp_reg, ra_save)			\
+		move ra_save, $31; /* Save old ra.  */	\
+		.set noreorder;				\
+		bal 10f; /* Find addr of .cpsetup.  */	\
+		nop;					\
+10:							\
+		.set reorder;				\
+		.cpsetup $31, cp_reg, 10b;		\
+		move $31, ra_save
+# define SETUP_GPX64_L(cp_reg, ra_save, l)  \
+		move ra_save, $31; /* Save old ra.  */	\
+		.set noreorder;				\
+		bal l;   /* Find addr of .cpsetup.  */	\
+		nop;					\
+l:							\
+		.set reorder;				\
+		.cpsetup $31, cp_reg, l;		\
+		move $31, ra_save
+# define RESTORE_GP64 \
+		.cpreturn
+/* Use alternate register for context pointer.  */
+# define USE_ALT_CP(reg)	\
+		.cplocal reg
+#endif /* _MIPS_SIM != _MIPS_SIM_ABI32 */
+
+/*
+ * Stack Frame Definitions
+ */
+#if (_MIPS_SIM == _MIPS_SIM_ABI32)
+# define NARGSAVE 4 /* Space for 4 argument registers must be allocated.  */
+#endif
+#if (_MIPS_SIM == _MIPS_SIM_ABI64 || _MIPS_SIM == _MIPS_SIM_NABI32)
+# define NARGSAVE 0 /* No caller responsibilities.  */
+#endif
+
+
+/*
+ * LEAF - declare leaf routine
+ */
+#define	LEAF(symbol)                                    \
+		.globl	symbol;                         \
+		.align	2;                              \
+		.type	symbol,@function;               \
+		.ent	symbol,0;                       \
+symbol:		.frame	sp,0,ra
+
+/*
+ * NESTED - declare nested routine entry point
+ */
+#define	NESTED(symbol, framesize, rpc)                  \
+		.globl	symbol;                         \
+		.align	2;                              \
+		.type	symbol,@function;               \
+		.ent	symbol,0;                       \
+symbol:		.frame	sp, framesize, rpc
+
+/*
+ * END - mark end of function
+ */
+#ifndef END
+# define END(function)                                   \
+		.end	function;		        \
+		.size	function,.-function
+#endif
+
+/*
+ * EXPORT - export definition of symbol
+ */
+#define	EXPORT(symbol)                                  \
+		.globl	symbol;                         \
+symbol:
+
+/*
+ * ABS - export absolute symbol
+ */
+#define	ABS(symbol,value)                               \
+		.globl	symbol;                         \
+symbol		=	value
+
+#define	PANIC(msg)                                      \
+		.set	push;				\
+		.set	reorder;                        \
+		la	a0,8f;                          \
+		jal	panic;                          \
+9:		b	9b;                             \
+		.set	pop;				\
+		TEXT(msg)
+
+/*
+ * Print formated string
+ */
+#define PRINT(string)                                   \
+		.set	push;				\
+		.set	reorder;                        \
+		la	a0,8f;                          \
+		jal	printk;                         \
+		.set	pop;				\
+		TEXT(string)
+
+#define	TEXT(msg)                                       \
+		.data;                                  \
+8:		.asciiz	msg;                            \
+		.previous;
+
+/*
+ * Build text tables
+ */
+#define TTABLE(string)                                  \
+		.text;                                  \
+		.word	1f;                             \
+		.previous;                              \
+		.data;                                  \
+1:		.asciz	string;                         \
+		.previous
+
+/*
+ * MIPS IV pref instruction.
+ * Use with .set noreorder only!
+ *
+ * MIPS IV implementations are free to treat this as a nop.  The R5000
+ * is one of them.  So we should have an option not to use this instruction.
+ */
+#if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) || \
+    (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
+# define PREF(hint,addr)                                 \
+		pref	hint,addr
+# define PREFX(hint,addr)                                \
+		prefx	hint,addr
+#else
+# define PREF
+# define PREFX
+#endif
+
+/*
+ * MIPS ISA IV/V movn/movz instructions and equivalents for older CPUs.
+ */
+#if _MIPS_ISA == _MIPS_ISA_MIPS1
+# define MOVN(rd,rs,rt)					\
+		.set	push;				\
+		.set	reorder;			\
+		beqz	rt,9f;				\
+		move	rd,rs;				\
+		.set	pop;				\
+9:
+# define MOVZ(rd,rs,rt)					\
+		.set	push;				\
+		.set	reorder;			\
+		bnez	rt,9f;				\
+		move	rd,rt;				\
+		.set	pop;				\
+9:
+#endif /* _MIPS_ISA == _MIPS_ISA_MIPS1 */
+#if (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3)
+# define MOVN(rd,rs,rt)					\
+		.set	push;				\
+		.set	noreorder;			\
+		bnezl	rt,9f;				\
+		move	rd,rs;				\
+		.set	pop;				\
+9:
+# define MOVZ(rd,rs,rt)					\
+		.set	push;				\
+		.set	noreorder;			\
+		beqzl	rt,9f;				\
+		movz	rd,rs;				\
+		.set	pop;				\
+9:
+#endif /* (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3) */
+#if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) || \
+    (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
+# define MOVN(rd,rs,rt)					\
+		movn	rd,rs,rt
+# define MOVZ(rd,rs,rt)					\
+		movz	rd,rs,rt
+#endif /* (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) */
+
+/*
+ * Stack alignment
+ */
+#if (_MIPS_SIM == _MIPS_SIM_ABI64) || (_MIPS_SIM == _MIPS_SIM_NABI32)
+# define ALSZ	15
+# define ALMASK	~15
+#else
+# define ALSZ	7
+# define ALMASK	~7
+#endif
+
+/*
+ * Size of a register
+ */
+#if (_MIPS_SIM == _MIPS_SIM_ABI64) || (_MIPS_SIM == _MIPS_SIM_NABI32)
+# define SZREG	8
+#else
+# define SZREG	4
+#endif
+
+/*
+ * Use the following macros in assemblercode to load/store registers,
+ * pointers etc.
+ */
+#if (SZREG == 4)
+# define REG_S sw
+# define REG_L lw
+#else
+# define REG_S sd
+# define REG_L ld
+#endif
+
+/*
+ * How to add/sub/load/store/shift C int variables.
+ */
+#if (_MIPS_SZINT == 32)
+# define INT_ADD	add
+# define INT_ADDI	addi
+# define INT_ADDU	addu
+# define INT_ADDIU	addiu
+# define INT_SUB	add
+# define INT_SUBI	subi
+# define INT_SUBU	subu
+# define INT_SUBIU	subu
+# define INT_L		lw
+# define INT_S		sw
+#endif
+
+#if (_MIPS_SZINT == 64)
+# define INT_ADD	dadd
+# define INT_ADDI	daddi
+# define INT_ADDU	daddu
+# define INT_ADDIU	daddiu
+# define INT_SUB	dadd
+# define INT_SUBI	dsubi
+# define INT_SUBU	dsubu
+# define INT_SUBIU	dsubu
+# define INT_L		ld
+# define INT_S		sd
+#endif
+
+/*
+ * How to add/sub/load/store/shift C long variables.
+ */
+#if (_MIPS_SZLONG == 32)
+# define LONG_ADD	add
+# define LONG_ADDI	addi
+# define LONG_ADDU	addu
+# define LONG_ADDIU	addiu
+# define LONG_SUB	add
+# define LONG_SUBI	subi
+# define LONG_SUBU	subu
+# define LONG_SUBIU	subu
+# define LONG_L		lw
+# define LONG_S		sw
+# define LONG_SLL	sll
+# define LONG_SLLV	sllv
+# define LONG_SRL	srl
+# define LONG_SRLV	srlv
+# define LONG_SRA	sra
+# define LONG_SRAV	srav
+#endif
+
+#if (_MIPS_SZLONG == 64)
+# define LONG_ADD	dadd
+# define LONG_ADDI	daddi
+# define LONG_ADDU	daddu
+# define LONG_ADDIU	daddiu
+# define LONG_SUB	dadd
+# define LONG_SUBI	dsubi
+# define LONG_SUBU	dsubu
+# define LONG_SUBIU	dsubu
+# define LONG_L		ld
+# define LONG_S		sd
+# define LONG_SLL	dsll
+# define LONG_SLLV	dsllv
+# define LONG_SRL	dsrl
+# define LONG_SRLV	dsrlv
+# define LONG_SRA	dsra
+# define LONG_SRAV	dsrav
+#endif
+
+/*
+ * How to add/sub/load/store/shift pointers.
+ */
+#if (_MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32)
+# define PTR_ADD	add
+# define PTR_ADDI	addi
+# define PTR_ADDU	addu
+# define PTR_ADDIU	addiu
+# define PTR_SUB	add
+# define PTR_SUBI	subi
+# define PTR_SUBU	subu
+# define PTR_SUBIU	subu
+# define PTR_L		lw
+# define PTR_LA		la
+# define PTR_S		sw
+# define PTR_SLL	sll
+# define PTR_SLLV	sllv
+# define PTR_SRL	srl
+# define PTR_SRLV	srlv
+# define PTR_SRA	sra
+# define PTR_SRAV	srav
+
+# define PTR_SCALESHIFT	2
+#endif
+
+#if _MIPS_SIM == _MIPS_SIM_NABI32
+# define PTR_ADD	add
+# define PTR_ADDI	addi
+# define PTR_ADDU	add /* no u */
+# define PTR_ADDIU	addi /* no u */
+# define PTR_SUB	add
+# define PTR_SUBI	subi
+# define PTR_SUBU	sub /* no u */
+# define PTR_SUBIU	sub /* no u */
+# define PTR_L		lw
+# define PTR_LA		la
+# define PTR_S		sw
+# define PTR_SLL	sll
+# define PTR_SLLV	sllv
+# define PTR_SRL	srl
+# define PTR_SRLV	srlv
+# define PTR_SRA	sra
+# define PTR_SRAV	srav
+
+# define PTR_SCALESHIFT	2
+#endif
+
+#if (_MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 64 /* o64??? */) \
+    || _MIPS_SIM == _MIPS_SIM_ABI64
+# define PTR_ADD	dadd
+# define PTR_ADDI	daddi
+# define PTR_ADDU	daddu
+# define PTR_ADDIU	daddiu
+# define PTR_SUB	dadd
+# define PTR_SUBI	dsubi
+# define PTR_SUBU	dsubu
+# define PTR_SUBIU	dsubu
+# define PTR_L		ld
+# define PTR_LA		dla
+# define PTR_S		sd
+# define PTR_SLL	dsll
+# define PTR_SLLV	dsllv
+# define PTR_SRL	dsrl
+# define PTR_SRLV	dsrlv
+# define PTR_SRA	dsra
+# define PTR_SRAV	dsrav
+
+# define PTR_SCALESHIFT	3
+#endif
+
+/*
+ * Some cp0 registers were extended to 64bit for MIPS III.
+ */
+#if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
+    (_MIPS_ISA == _MIPS_ISA_MIPS32)
+# define MFC0	mfc0
+# define MTC0	mtc0
+#endif
+#if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) || \
+    (_MIPS_ISA == _MIPS_ISA_MIPS5) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
+# define MFC0	dmfc0
+# define MTC0	dmtc0
+#endif
+
+#endif /* sys/asm.h */
diff --git a/libc/sysdeps/linux/mips/sys/fpregdef.h b/libc/sysdeps/linux/mips/sys/fpregdef.h
new file mode 100644
index 000000000..378115274
--- /dev/null
+++ b/libc/sysdeps/linux/mips/sys/fpregdef.h
@@ -0,0 +1,61 @@
+/* Copyright (C) 1991, 92, 94, 95, 96, 97, 98 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_FPREGDEF_H
+#define _SYS_FPREGDEF_H
+
+/*
+ * These definitions only cover the R3000-ish 16/32 register model.
+ * But we're trying to be R3000 friendly anyway ...
+ */
+#define fv0	$f0      /* return value */
+#define fv0f	$f1
+#define fv1	$f2
+#define fv1f	$f3
+#define fa0	$f12     /* argument registers */
+#define fa0f	$f13
+#define fa1	$f14
+#define fa1f	$f15
+#define ft0	$f4      /* caller saved */
+#define ft0f	$f5
+#define ft1	$f6
+#define ft1f	$f7
+#define ft2	$f8
+#define ft2f	$f9
+#define ft3	$f10
+#define ft3f	$f11
+#define ft4	$f16
+#define ft4f	$f17
+#define ft5	$f18
+#define ft5f	$f19
+#define fs0	$f20     /* callee saved */
+#define fs0f	$f21
+#define fs1	$f22
+#define fs1f	$f23
+#define fs2	$f24
+#define fs2f	$f25
+#define fs3	$f26
+#define fs3f	$f27
+#define fs4	$f28
+#define fs4f	$f29
+#define fs5	$f30
+#define fs5f	$f31
+
+#define fcr31	$31      /* FPU status register */
+
+#endif /* sys/fpregdef.h */
diff --git a/libc/sysdeps/linux/mips/sys/regdef.h b/libc/sysdeps/linux/mips/sys/regdef.h
index c4df60383..9d2c4c1c4 100644
--- a/libc/sysdeps/linux/mips/sys/regdef.h
+++ b/libc/sysdeps/linux/mips/sys/regdef.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 2002, 2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ralf Baechle <ralf@gnu.org>.
 
@@ -31,6 +31,20 @@
 #define a1      $5
 #define a2      $6
 #define a3      $7
+#if _MIPS_SIM != _MIPS_SIM_ABI32
+#define a4      $8
+#define a5      $9
+#define a6      $10
+#define a7      $11
+#define t0      $12
+#define t1      $13
+#define t2      $14
+#define t3      $15
+#define ta0     a4
+#define ta1     a5
+#define ta2     a6
+#define ta3     a7
+#else /* if _MIPS_SIM == _MIPS_SIM_ABI32 */
 #define t0      $8      /* caller saved */
 #define t1      $9
 #define t2      $10
@@ -39,6 +53,11 @@
 #define t5      $13
 #define t6      $14
 #define t7      $15
+#define ta0     t4
+#define ta1     t5
+#define ta2     t6
+#define ta3     t7
+#endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */
 #define s0      $16     /* callee saved */
 #define s1      $17
 #define s2      $18
diff --git a/libc/sysdeps/linux/mips/sys/ucontext.h b/libc/sysdeps/linux/mips/sys/ucontext.h
index f57b91e4f..90aa09a80 100644
--- a/libc/sysdeps/linux/mips/sys/ucontext.h
+++ b/libc/sysdeps/linux/mips/sys/ucontext.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998, 2000 Free Software Foundation, Inc.
+/* Copyright (C) 1998, 1999, 2002, 2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -16,65 +16,143 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-/* Don't rely on this, the interface is currently messed up and may need to
-   be broken to be fixed.  */
+/* System V/mips ABI compliant context switching support.  */
+
 #ifndef _SYS_UCONTEXT_H
 #define _SYS_UCONTEXT_H	1
 
 #include <features.h>
 #include <signal.h>
 
-/* We need the signal context definitions even if they are not used
-   included in <signal.h>.  */
-#include <bits/sigcontext.h>
-
-
 /* Type for general register.  */
-typedef unsigned long int greg_t;
+#if _MIPS_SIM == _MIPS_SIM_ABI32
+typedef __uint32_t greg_t;
+#else
+typedef __uint64_t greg_t;
+#endif
 
 /* Number of general registers.  */
-#define NGREG	37
-#define NFPREG	33
+#define NGREG	36
 
 /* Container for all general registers.  */
-/* gregset_t must be an array.  The below declared array corresponds to:
-typedef struct gregset {
-	greg_t	g_regs[32];
-	greg_t	g_hi;
-	greg_t	g_lo;
-	greg_t	g_pad[3];
-} gregset_t;  */
 typedef greg_t gregset_t[NGREG];
 
-/* Container for all FPU registers.  */
-typedef struct fpregset {
-	union {
-		double	fp_dregs[32];
-		struct {
-			float		_fp_fregs;
-			unsigned int	_fp_pad;
-		} fp_fregs[32];
-	} fp_r;
-	unsigned int	fp_csr;
-	unsigned int	fp_pad;
-} fpregset_t;
+/* Number of each register is the `gregset_t' array.  */
+enum
+{
+  CTX_R0 = 0,
+#define CTX_R0	CTX_R0
+  CTX_AT = 1,
+#define CTX_AT	CTX_AT
+  CTX_V0 = 2,
+#define CTX_V0	CTX_V0
+  CTX_V1 = 3,
+#define CTX_V1	CTX_V1
+  CTX_A0 = 4,
+#define CTX_A0	CTX_A0
+  CTX_A1 = 5,
+#define CTX_A1	CTX_A1
+  CTX_A2 = 6,
+#define CTX_A2	CTX_A2
+  CTX_A3 = 7,
+#define CTX_A3	CTX_A3
+  CTX_T0 = 8,
+#define CTX_T0	CTX_T0
+  CTX_T1 = 9,
+#define CTX_T1	CTX_T1
+  CTX_T2 = 10,
+#define CTX_T2	CTX_T2
+  CTX_T3 = 11,
+#define CTX_T3	CTX_T3
+  CTX_T4 = 12,
+#define CTX_T4	CTX_T4
+  CTX_T5 = 13,
+#define CTX_T5	CTX_T5
+  CTX_T6 = 14,
+#define CTX_T6	CTX_T6
+  CTX_T7 = 15,
+#define CTX_T7	CTX_T7
+  CTX_S0 = 16,
+#define CTX_S0	CTX_S0
+  CTX_S1 = 17,
+#define CTX_S1	CTX_S1
+  CTX_S2 = 18,
+#define CTX_S2	CTX_S2
+  CTX_S3 = 19,
+#define CTX_S3	CTX_S3
+  CTX_S4 = 20,
+#define CTX_S4	CTX_S4
+  CTX_S5 = 21,
+#define CTX_S5	CTX_S5
+  CTX_S6 = 22,
+#define CTX_S6	CTX_S6
+  CTX_S7 = 23,
+#define CTX_S7	CTX_S7
+  CTX_T8 = 24,
+#define CTX_T8	CTX_T8
+  CTX_T9 = 25,
+#define CTX_T9	CTX_T9
+  CTX_K0 = 26,
+#define CTX_K0	CTX_K0
+  CTX_K1 = 27,
+#define CTX_K1	CTX_K1
+  CTX_GP = 28,
+#define CTX_GP	CTX_GP
+  CTX_SP = 29,
+#define CTX_SP	CTX_SP
+  CTX_S8 = 30,
+#define CTX_S8	CTX_S8
+  CTX_RA = 31,
+#define CTX_RA	CTX_RA
+  CTX_MDLO = 32,
+#define CTX_MDLO	CTX_MDLO
+  CTX_MDHI = 33,
+#define CTX_MDHI	CTX_MDHI
+  CTX_CAUSE = 34,
+#define CTX_CAUSE	CTX_CAUSE
+  CTX_EPC = 35,
+#define CTX_EPC	CTX_EPC
+};
 
+/* Structure to describe FPU registers.  */
+typedef struct fpregset
+{
+  union
+  {
+#if _MIPS_SIM == _MIPS_SIM_ABI32
+    double fp_dregs[16];
+    float fp_fregs[32];
+    unsigned int fp_regs[32];
+#else
+    double fp_dregs[32];
+    /* float fp_fregs[32]; */
+    __uint64_t fp_regs[32];
+#endif
+  } fp_r;
+  unsigned int fp_csr;
+  unsigned int fp_pad;
+} fpregset_t;
 
 /* Context to describe whole processor state.  */
 typedef struct
-  {
-    gregset_t gregs;
-    fpregset_t fpregs;
-  } mcontext_t;
+{
+  gregset_t gpregs;
+  fpregset_t fpregs;
+} mcontext_t;
 
 /* Userlevel context.  */
 typedef struct ucontext
-  {
-    unsigned long int uc_flags;
-    struct ucontext *uc_link;
-    stack_t uc_stack;
-    mcontext_t uc_mcontext;
-    __sigset_t uc_sigmask;
-  } ucontext_t;
+{
+#if _MIPS_SIM == _MIPS_SIM_ABI32
+  unsigned long int uc_flags;
+#else
+  __uint64_t uc_flags;
+#endif
+  struct ucontext *uc_link;
+  __sigset_t uc_sigmask;
+  stack_t uc_stack;
+  mcontext_t uc_mcontext;
+  int uc_filler[48];
+} ucontext_t;
 
 #endif /* sys/ucontext.h */