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glibc/sysdeps/unix/sysv/linux/mips/swapcontext.S
Adhemerval Zanella a3ae315a8f mips: Remove rt_sigreturn usage on context function 
Similar to powerpc, mips also issues rt_sigreturn for setcontext
case the v0 value saved is not the one set by setcontext or
makecontext. As for powerpc, it is intention is no really supported
since setcontext is not async-signal-safe.

Checked the context tests on mips64-linux-gnu and mips-linux-gnu.

	* sysdeps/unix/sysv/linux/mips/getcontext.S (__getcontext): Remove
	the magic flag store.
	* sysdeps/unix/sysv/linux/mips/makecontext.S (__makecontext):
	Likewise.
	* sysdeps/unix/sysv/linux/mips/swapcontext.S (__swapcontext):
	Likewise.
	* sysdeps/unix/sysv/linux/mips/setcontext.S (__setcontext):
	Remove rt_sigreturn call.
2019-04-17 15:14:45 -03:00

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/* Save and set current context.
Copyright (C) 2009-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
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, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <sys/asm.h>
#include <sys/fpregdef.h>
#include <sys/regdef.h>
#include "ucontext_i.h"
/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
.text
.set nomips16
LOCALSZ = 0
ARGSZ = 0
MASK = 0x00000000
#ifdef __PIC__
LOCALSZ = 1 /* save gp */
#endif
#if _MIPS_SIM != _ABIO32
ARGSZ = 1 /* save a1 */
# ifdef __PIC__
MASK = 0x10000000
# endif
#endif
FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
#if _MIPS_SIM != _ABIO32
A1OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */
#else
A1OFF = FRAMESZ + (1 * SZREG) /* caller-allocated */
#endif
MCONTEXT_GREGSZ = 8
#if _MIPS_SIM == _ABIO32 && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
MCONTEXT_GREGOFF = 4
#else
MCONTEXT_GREGOFF = 0
#endif
NESTED (__swapcontext, FRAMESZ, ra)
.mask MASK, -(ARGSZ * SZREG)
.fmask 0x00000000, 0
#ifdef __PIC__
SETUP_GP
move a2, sp
# define _SP a2
# if _MIPS_SIM != _ABIO32
move a3, gp
# define _GP a3
# endif
PTR_ADDIU sp, -FRAMESZ
cfi_adjust_cfa_offset (FRAMESZ)
SETUP_GP64_STACK (GPOFF, __swapcontext)
SAVE_GP (GPOFF)
#else /* ! __PIC__ */
# define _SP sp
# define _GP gp
#endif /* ! __PIC__ */
#ifdef PROF
.set noat
move AT, ra
jal _mcount
.set at
#endif
REG_S s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
REG_S _GP, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
#endif
REG_S _SP, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S ra, (MCONTEXT_GREGOFF + MCONTEXT_PC)(a0)
#ifdef __mips_hard_float
# if _MIPS_SIM == _ABI64
s.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
# else /* _MIPS_SIM != _ABI64 */
s.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
s.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
# endif /* _MIPS_SIM != _ABI64 */
cfc1 v1, fcr31
sw v1, MCONTEXT_FPC_CSR(a0)
#endif /* __mips_hard_float */
REG_S a1, A1OFF(sp)
/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
li a3, _NSIG8
PTR_ADDU a2, a0, UCONTEXT_SIGMASK
PTR_ADDU a1, a1, UCONTEXT_SIGMASK
li a0, SIG_SETMASK
li v0, SYS_ify (rt_sigprocmask)
syscall
bnez a3, 99f
REG_L v0, A1OFF(sp)
#ifdef __mips_hard_float
# if _MIPS_SIM == _ABI64
l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0)
# else /* _MIPS_SIM != _ABI64 */
l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0)
# endif /* _MIPS_SIM != _ABI64 */
lw v1, MCONTEXT_FPC_CSR(v0)
ctc1 v1, fcr31
#endif /* __mips_hard_float */
/* Note the contents of argument registers will be random
unless makecontext() has been called. */
REG_L a0, (MCONTEXT_GREGOFF + 4 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L a1, (MCONTEXT_GREGOFF + 5 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L a2, (MCONTEXT_GREGOFF + 6 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L a3, (MCONTEXT_GREGOFF + 7 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
#if _MIPS_SIM != _ABIO32
REG_L a4, (MCONTEXT_GREGOFF + 8 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L a5, (MCONTEXT_GREGOFF + 9 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L a6, (MCONTEXT_GREGOFF + 10 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L a7, (MCONTEXT_GREGOFF + 11 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
#endif
REG_L s0, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L s1, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L s2, (MCONTEXT_GREGOFF + 18 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L s3, (MCONTEXT_GREGOFF + 19 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L s4, (MCONTEXT_GREGOFF + 20 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L s5, (MCONTEXT_GREGOFF + 21 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L s6, (MCONTEXT_GREGOFF + 22 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L s7, (MCONTEXT_GREGOFF + 23 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
REG_L gp, (MCONTEXT_GREGOFF + 28 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
#endif
REG_L sp, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L fp, (MCONTEXT_GREGOFF + 30 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L ra, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(v0)
REG_L t9, (MCONTEXT_GREGOFF + MCONTEXT_PC)(v0)
move v0, zero
jr t9
99:
#ifdef __PIC__
PTR_LA t9, JUMPTARGET (__syscall_error)
RESTORE_GP64_STACK
PTR_ADDIU sp, FRAMESZ
cfi_adjust_cfa_offset (-FRAMESZ)
jr t9
#else /* ! __PIC__ */
j JUMPTARGET (__syscall_error)
#endif /* ! __PIC__ */
PSEUDO_END (__swapcontext)
weak_alias (__swapcontext, swapcontext)
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