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+/* Save and set current context.
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+ Copyright (C) 2009 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+ Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library. If not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#include <sysdep.h>
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+#include <sys/asm.h>
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+#include <sys/fpregdef.h>
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+#include <sys/regdef.h>
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+
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+#include "ucontext_i.h"
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+
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+/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
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+
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+ .text
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+LOCALSZ = 0
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+ARGSZ = 0
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+MASK = 0x00000000
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+#ifdef __PIC__
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+LOCALSZ = 1 /* save gp */
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+#endif
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+#if _MIPS_SIM != _ABIO32
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+ARGSZ = 1 /* save a1 */
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+# ifdef __PIC__
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+MASK = 0x10000000
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+# endif
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+#endif
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+FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
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+GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
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+#if _MIPS_SIM != _ABIO32
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+A1OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */
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+#else
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+A1OFF = FRAMESZ + (1 * SZREG) /* caller-allocated */
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+#endif
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+
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+NESTED (__swapcontext, FRAMESZ, ra)
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+ .mask MASK, -(ARGSZ * SZREG)
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+ .fmask 0x00000000, 0
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+
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+#ifdef __PIC__
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+ SETUP_GP
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+
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+ move a2, sp
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+# define _SP a2
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+
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+# if _MIPS_SIM != _ABIO32
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+ move a3, gp
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+# define _GP a3
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+# endif
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+
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+ PTR_ADDIU sp, -FRAMESZ
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+ SETUP_GP64 (GPOFF, __swapcontext)
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+ SAVE_GP (GPOFF)
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+
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+#else /* ! __PIC__ */
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+# define _SP sp
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+# define _GP gp
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+
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+#endif /* ! __PIC__ */
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+
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+#ifdef PROF
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+ .set noat
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+ move AT, ra
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+ jal _mcount
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+ .set at
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+#endif
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+
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+ /* Store a magic flag. */
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+ li v1, 1
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+ REG_S v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
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+
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+ REG_S s0, (16 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S s1, (17 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S s2, (18 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S s3, (19 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S s4, (20 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S s5, (21 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S s6, (22 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S s7, (23 * SZREG + MCONTEXT_GREGS)(a0)
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+#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
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+ REG_S _GP, (28 * SZREG + MCONTEXT_GREGS)(a0)
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+#endif
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+ REG_S _SP, (29 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S fp, (30 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S ra, (31 * SZREG + MCONTEXT_GREGS)(a0)
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+ REG_S ra, MCONTEXT_PC(a0)
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+
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+#ifdef __mips_hard_float
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+# if _MIPS_SIM == _ABI64
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+ s.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
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+
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+# else /* _MIPS_SIM != _ABI64 */
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+ s.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
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+ s.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
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+
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+# endif /* _MIPS_SIM != _ABI64 */
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+
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+ cfc1 v1, fcr31
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+ sw v1, MCONTEXT_FPC_CSR(a0)
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+#endif /* __mips_hard_float */
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+
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+ REG_S a1, A1OFF(sp)
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+
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+/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
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+ li a3, _NSIG8
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+ PTR_ADDU a2, a0, UCONTEXT_SIGMASK
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+ PTR_ADDU a1, a1, UCONTEXT_SIGMASK
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+ li a0, SIG_SETMASK
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+
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+ li v0, SYS_ify (rt_sigprocmask)
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+ syscall
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+ bnez a3, 99f
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+
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+ REG_L v0, A1OFF(sp)
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+
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+#ifdef __mips_hard_float
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+# if _MIPS_SIM == _ABI64
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+ l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0)
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+
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+# else /* _MIPS_SIM != _ABI64 */
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+ l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
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+ l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0)
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+
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+# endif /* _MIPS_SIM != _ABI64 */
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+
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+ lw v1, MCONTEXT_FPC_CSR(v0)
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+ ctc1 v1, fcr31
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+#endif /* __mips_hard_float */
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+
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+ /* Note the contents of argument registers will be random
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+ unless makecontext() has been called. */
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+ REG_L a0, (4 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L a1, (5 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L a2, (6 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L a3, (7 * SZREG + MCONTEXT_GREGS)(v0)
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+#if _MIPS_SIM != _ABIO32
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+ REG_L a4, (8 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L a5, (9 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L a6, (10 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L a7, (11 * SZREG + MCONTEXT_GREGS)(v0)
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+#endif
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+
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+ REG_L s0, (16 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L s1, (17 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L s2, (18 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L s3, (19 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L s4, (20 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L s5, (21 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L s6, (22 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L s7, (23 * SZREG + MCONTEXT_GREGS)(v0)
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+#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
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+ REG_L gp, (28 * SZREG + MCONTEXT_GREGS)(v0)
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+#endif
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+ REG_L sp, (29 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L fp, (30 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L ra, (31 * SZREG + MCONTEXT_GREGS)(v0)
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+ REG_L t9, MCONTEXT_PC(v0)
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+
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+ move v0, zero
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+ jr t9
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+
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+99:
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+#ifdef __PIC__
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+ PTR_LA t9, JUMPTARGET (__syscall_error)
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+ RESTORE_GP64
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+ PTR_ADDIU sp, FRAMESZ
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+ jr t9
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+
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+#else /* ! __PIC__ */
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+
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+ j JUMPTARGET (__syscall_error)
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+#endif /* ! __PIC__ */
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+PSEUDO_END (__swapcontext)
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+
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+weak_alias (__swapcontext, swapcontext)
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