| /* Copyright (C) 2001-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by David Mosberger-Tang <davidm@hpl.hp.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 <features.h> |
| |
| #include "ucontext_i.h" |
| |
| /* __getcontext (ucontext_t *ucp) |
| |
| Saves the machine context in UCP such that when it is activated, |
| it appears as if __getcontext() returned again. The only difference |
| is that on a first return, r9 contains 1 and on a subsequent |
| return, it contains 0. |
| |
| This implementation in intended to be used for *synchronous* context |
| switches only. Therefore, it does not have to save anything |
| other than the PRESERVED state. */ |
| |
| ENTRY(__getcontext) |
| .prologue |
| .body |
| alloc r11 = ar.pfs, 1, 0, 4, 0 |
| |
| // sigprocmask (SIG_BLOCK, NULL, &sc->sc_mask): |
| |
| mov r3 = SC_MASK |
| mov out0 = SIG_BLOCK |
| |
| flushrs // save dirty partition on rbs |
| mov out1 = 0 |
| add out2 = r3, in0 |
| |
| mov out3 = 8 // sizeof kernel sigset_t |
| DO_CALL(__NR_rt_sigprocmask) |
| |
| mov.m rFPSR = ar.fpsr |
| mov.m rRSC = ar.rsc |
| add r2 = SC_GR+1*8, r32 |
| ;; |
| mov.m rBSP = ar.bsp |
| .prologue |
| .save ar.unat, rUNAT |
| mov.m rUNAT = ar.unat |
| .body |
| add r3 = SC_GR+4*8, r32 |
| ;; |
| |
| .mem.offset 0,0; st8.spill [r2] = r1, (5*8 - 1*8) |
| .mem.offset 8,0; st8.spill [r3] = r4, 16 |
| mov rPFS = r11 |
| ;; |
| .mem.offset 0,0; st8.spill [r2] = r5, 16 |
| .mem.offset 8,0; st8.spill [r3] = r6, 48 |
| and rTMP = ~0x3, rRSC |
| ;; |
| .mem.offset 0,0; st8.spill [r2] = r7, (SC_FR+2*16-(SC_GR+7*8)) |
| .mem.offset 8,0; st8.spill [r3] = sp, (SC_FR+3*16-(SC_GR+12*8)) |
| ;; |
| mov.m ar.rsc = rTMP // put RSE into enforced lazy mode |
| mov.m rNAT = ar.unat |
| mov.i rLC = ar.lc |
| ;; |
| mov.m rRNAT = ar.rnat |
| mov.m ar.rsc = rRSC // restore RSE mode |
| mov rPR = pr |
| |
| /* |
| * Rotate NaT bits by rPOS positions to the right: |
| */ |
| stf.spill [r2] = f2, 32 |
| stf.spill [r3] = f3, 32 |
| add rPOS = SC_GR, r32 // rPOS <- &sc_gr[0] |
| ;; |
| stf.spill [r2] = f4, (16*16-4*16) |
| stf.spill [r3] = f5, (17*16-5*16) |
| extr.u rPOS = rPOS, 3, 6 // get NaT bit number for r0 |
| ;; |
| stf.spill [r2] = f16, 32 |
| stf.spill [r3] = f17, 32 |
| sub rCPOS = 64, rPOS |
| ;; |
| stf.spill [r2] = f18, 32 |
| stf.spill [r3] = f19, 32 |
| shr.u rTMP = rNAT, rPOS |
| ;; |
| stf.spill [r2] = f20, 32 |
| stf.spill [r3] = f21, 32 |
| shl rNAT = rNAT, rCPOS |
| ;; |
| stf.spill [r2] = f22, 32 |
| stf.spill [r3] = f23, 32 |
| or rNAT = rNAT, rTMP |
| ;; |
| stf.spill [r2] = f24, 32 |
| stf.spill [r3] = f25, 32 |
| mov r8 = 0 |
| ;; |
| stf.spill [r2] = f26, 32 |
| stf.spill [r3] = f27, 32 |
| mov r9 = 1 |
| ;; |
| stf.spill [r2] = f28, 32 |
| stf.spill [r3] = f29, 32 |
| mov rB0 = b0 |
| ;; |
| stf.spill [r2] = f30, 32 |
| stf.spill [r3] = f31, 32 |
| mov rB1 = b1 |
| ;; |
| mov ar.unat = rUNAT // we're done spilling integer regs; restore caller's UNaT |
| add r2 = SC_NAT, r32 |
| add r3 = SC_BSP, r32 |
| ;; |
| st8 [r2] = rNAT, (SC_RNAT-SC_NAT) |
| st8 [r3] = rBSP, (SC_UNAT-SC_BSP) |
| mov rB2 = b2 |
| ;; |
| st8 [r2] = rRNAT, (SC_FPSR-SC_RNAT) |
| st8 [r3] = rUNAT, (SC_PFS-SC_UNAT) |
| mov rB3 = b3 |
| ;; |
| st8 [r2] = rFPSR, (SC_LC-SC_FPSR) |
| st8 [r3] = rPFS, (SC_PR-SC_PFS) |
| mov rB4 = b4 |
| ;; |
| st8 [r2] = rLC, (SC_BR+0*8-SC_LC) |
| st8 [r3] = rPR, (SC_BR+1*8-SC_PR) |
| mov rB5 = b5 |
| ;; |
| st8 [r2] = rB0, 16 |
| st8 [r3] = rB1, 16 |
| ;; |
| st8 [r2] = rB2, 16 |
| st8 [r3] = rB3, 16 |
| ;; |
| st8 [r2] = rB4 |
| st8 [r3] = rB5 |
| ret |
| END(__getcontext) |
| |
| weak_alias (__getcontext, getcontext) |