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197 lines
5.3 KiB
ArmAsm
197 lines
5.3 KiB
ArmAsm
/* Set current context.
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Copyright (C) 2009-2016 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 setcontext (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 a0 */
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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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A0OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */
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#else
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A0OFF = FRAMESZ + (0 * SZREG) /* caller-allocated */
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#endif
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NESTED (__setcontext, 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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#endif
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PTR_ADDIU sp, -FRAMESZ
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cfi_adjust_cfa_offset (FRAMESZ)
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#ifdef __PIC__
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SETUP_GP64_STACK (GPOFF, __setcontext)
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SAVE_GP (GPOFF)
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#endif
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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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/* Check for the magic flag. */
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li v0, 1
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REG_L v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
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bne v0, v1, 98f
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REG_S a0, A0OFF(sp)
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/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
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li a3, _NSIG8
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move a2, zero
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PTR_ADDU a1, a0, 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, A0OFF(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, (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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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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move v0, zero
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jr t9
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98:
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/* This is a context obtained from a signal handler.
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Perform a full restore by pushing the context
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passed onto a simulated signal frame on the stack
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and call the signal return syscall as if a signal
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handler exited normally. */
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PTR_ADDIU sp, -((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
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cfi_adjust_cfa_offset ((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
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/* Only ucontext is referred to from rt_sigreturn,
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copy it. */
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PTR_ADDIU t1, sp, RT_SIGFRAME_UCONTEXT
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li t3, ((UCONTEXT_SIZE + SZREG - 1) / SZREG) - 1
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0:
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REG_L t2, (a0)
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PTR_ADDIU a0, SZREG
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REG_S t2, (t1)
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PTR_ADDIU t1, SZREG
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.set noreorder
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bgtz t3, 0b
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addiu t3, -1
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.set reorder
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/* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe. */
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li v0, SYS_ify (rt_sigreturn)
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syscall
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/* Restore the stack and fall through to the error
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path. Successful rt_sigreturn never returns to
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its calling place. */
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PTR_ADDIU sp, ((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
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cfi_adjust_cfa_offset (-((RT_SIGFRAME_SIZE + ALSZ) & ALMASK))
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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 (__setcontext)
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weak_alias (__setcontext, setcontext)
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