/* 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 #ifdef PROF .set noat move AT, ra jal _mcount .set at #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)