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  1.   b76e3f4fdf8cfba66d40e63d106528b465dbb7a5
  2.   sysdeps
  3.   unix
  4.   sysv
  5.   linux
  6.   mips
  7.   swapcontext.S
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/* Save and set current context.
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   Copyright (C) 2009-2018 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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   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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   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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   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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#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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#include "ucontext_i.h"
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/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
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	.text
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	.set	nomips16
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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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MCONTEXT_GREGSZ = 8
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#if _MIPS_SIM == _ABIO32 && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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MCONTEXT_GREGOFF = 4
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#else
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MCONTEXT_GREGOFF = 0
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#endif
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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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#ifdef __PIC__
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	SETUP_GP
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	move	a2, sp
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# define _SP a2
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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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	PTR_ADDIU sp, -FRAMESZ
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	cfi_adjust_cfa_offset (FRAMESZ)
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	SETUP_GP64_STACK (GPOFF, __swapcontext)
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	SAVE_GP (GPOFF)
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#else  /* ! __PIC__ */
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# define _SP sp
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# define _GP gp
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#endif /* ! __PIC__ */
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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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	/* Store a magic flag.	*/
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	li	v1, 1
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	/* zero */
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	REG_S	v1, (MCONTEXT_GREGOFF + 0 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
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	REG_S	_GP, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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#endif
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	REG_S	_SP, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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	REG_S	ra, (MCONTEXT_GREGOFF + MCONTEXT_PC)(a0)
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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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# 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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# endif /* _MIPS_SIM != _ABI64 */
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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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	REG_S	a1, A1OFF(sp)
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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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	li	v0, SYS_ify (rt_sigprocmask)
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	syscall
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	bnez	a3, 99f
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	REG_L	v0, A1OFF(sp)
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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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# 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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# endif /* _MIPS_SIM != _ABI64 */
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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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	/* 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, (MCONTEXT_GREGOFF + 4 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	a1, (MCONTEXT_GREGOFF + 5 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	a2, (MCONTEXT_GREGOFF + 6 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	a3, (MCONTEXT_GREGOFF + 7 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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#if _MIPS_SIM != _ABIO32
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	REG_L	a4, (MCONTEXT_GREGOFF + 8 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	a5, (MCONTEXT_GREGOFF + 9 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	a6, (MCONTEXT_GREGOFF + 10 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	a7, (MCONTEXT_GREGOFF + 11 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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#endif
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	REG_L	s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
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	REG_L	gp, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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#endif
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	REG_L	sp, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
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	REG_L	t9, (MCONTEXT_GREGOFF + MCONTEXT_PC)(v0)
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	move	v0, zero
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	jr	t9
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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_STACK
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	PTR_ADDIU sp, FRAMESZ
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	cfi_adjust_cfa_offset (-FRAMESZ)
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	jr	t9
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#else  /* ! __PIC__ */
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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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weak_alias (__swapcontext, swapcontext)

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