/* Save and 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 swapcontext (ucontext_t *oucp, 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 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 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 SETUP_GP64 (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 /* Store a magic flag. */ li v1, 1 REG_S v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */ REG_S s0, (16 * SZREG + MCONTEXT_GREGS)(a0) REG_S s1, (17 * SZREG + MCONTEXT_GREGS)(a0) REG_S s2, (18 * SZREG + MCONTEXT_GREGS)(a0) REG_S s3, (19 * SZREG + MCONTEXT_GREGS)(a0) REG_S s4, (20 * SZREG + MCONTEXT_GREGS)(a0) REG_S s5, (21 * SZREG + MCONTEXT_GREGS)(a0) REG_S s6, (22 * SZREG + MCONTEXT_GREGS)(a0) REG_S s7, (23 * SZREG + MCONTEXT_GREGS)(a0) #if ! defined (__PIC__) || _MIPS_SIM != _ABIO32 REG_S _GP, (28 * SZREG + MCONTEXT_GREGS)(a0) #endif REG_S _SP, (29 * SZREG + MCONTEXT_GREGS)(a0) REG_S fp, (30 * SZREG + MCONTEXT_GREGS)(a0) REG_S ra, (31 * SZREG + MCONTEXT_GREGS)(a0) REG_S ra, 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, (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 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 (__swapcontext) weak_alias (__swapcontext, swapcontext)