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/* Set current context.
Copyright (C) 2009 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 setcontext (const ucontext_t *ucp) */
.text
LOCALSZ = 0
ARGSZ = 0
MASK = 0x00000000
#ifdef __PIC__
LOCALSZ = 1 /* save gp */
#endif
#if _MIPS_SIM != _ABIO32
ARGSZ = 1 /* save a0 */
# ifdef __PIC__
MASK = 0x10000000
# endif
#endif
FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
#if _MIPS_SIM != _ABIO32
A0OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */
#else
A0OFF = FRAMESZ + (0 * SZREG) /* caller-allocated */
#endif
NESTED (__setcontext, FRAMESZ, ra)
.mask MASK, -(ARGSZ * SZREG)
.fmask 0x00000000, 0
#ifdef __PIC__
SETUP_GP
#endif
PTR_ADDIU sp, -FRAMESZ
#ifdef __PIC__
SETUP_GP64 (GPOFF, __setcontext)
SAVE_GP (GPOFF)
#endif
/* Check for the magic flag. */
li v0, 1
REG_L v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
bne v0, v1, 98f
REG_S a0, A0OFF(sp)
/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
li a3, _NSIG8
move a2, zero
PTR_ADDU a1, a0, UCONTEXT_SIGMASK
li a0, SIG_SETMASK
li v0, SYS_ify (rt_sigprocmask)
syscall
bnez a3, 99f
REG_L v0, A0OFF(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, (4 * SZREG + MCONTEXT_GREGS)(v0)
REG_L a1, (5 * SZREG + MCONTEXT_GREGS)(v0)
REG_L a2, (6 * SZREG + MCONTEXT_GREGS)(v0)
REG_L a3, (7 * SZREG + MCONTEXT_GREGS)(v0)
#if _MIPS_SIM != _ABIO32
REG_L a4, (8 * SZREG + MCONTEXT_GREGS)(v0)
REG_L a5, (9 * SZREG + MCONTEXT_GREGS)(v0)
REG_L a6, (10 * SZREG + MCONTEXT_GREGS)(v0)
REG_L a7, (11 * SZREG + MCONTEXT_GREGS)(v0)
#endif
REG_L s0, (16 * SZREG + MCONTEXT_GREGS)(v0)
REG_L s1, (17 * SZREG + MCONTEXT_GREGS)(v0)
REG_L s2, (18 * SZREG + MCONTEXT_GREGS)(v0)
REG_L s3, (19 * SZREG + MCONTEXT_GREGS)(v0)
REG_L s4, (20 * SZREG + MCONTEXT_GREGS)(v0)
REG_L s5, (21 * SZREG + MCONTEXT_GREGS)(v0)
REG_L s6, (22 * SZREG + MCONTEXT_GREGS)(v0)
REG_L s7, (23 * SZREG + MCONTEXT_GREGS)(v0)
#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
REG_L gp, (28 * SZREG + MCONTEXT_GREGS)(v0)
#endif
REG_L sp, (29 * SZREG + MCONTEXT_GREGS)(v0)
REG_L fp, (30 * SZREG + MCONTEXT_GREGS)(v0)
REG_L ra, (31 * SZREG + MCONTEXT_GREGS)(v0)
REG_L t9, MCONTEXT_PC(v0)
move v0, zero
jr t9
98:
/* This is a context obtained from a signal handler.
Perform a full restore by pushing the context
passed onto a simulated signal frame on the stack
and call the signal return syscall as if a signal
handler exited normally. */
PTR_ADDIU sp, -((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
/* Only ucontext is referred to from rt_sigreturn,
copy it. */
PTR_ADDIU t1, sp, RT_SIGFRAME_UCONTEXT
li t3, ((UCONTEXT_SIZE + SZREG - 1) / SZREG) - 1
0:
REG_L t2, (a0)
PTR_ADDIU a0, SZREG
REG_S t2, (t1)
PTR_ADDIU t1, SZREG
.set noreorder
bgtz t3, 0b
addiu t3, -1
.set reorder
/* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe. */
li v0, SYS_ify (rt_sigreturn)
syscall
/* Restore the stack and fall through to the error
path. Successful rt_sigreturn never returns to
its calling place. */
PTR_ADDIU sp, ((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
99:
#ifdef __PIC__
PTR_LA t9, JUMPTARGET (__syscall_error)
RESTORE_GP64
PTR_ADDIU sp, FRAMESZ
jr t9
#else /* ! __PIC__ */
j JUMPTARGET (__syscall_error)
#endif /* ! __PIC__ */
PSEUDO_END (__setcontext)
weak_alias (__setcontext, setcontext)
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