diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/ia64/getcontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/ia64/getcontext.S | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/ia64/getcontext.S b/sysdeps/unix/sysv/linux/ia64/getcontext.S new file mode 100644 index 0000000000..24b58d435a --- /dev/null +++ b/sysdeps/unix/sysv/linux/ia64/getcontext.S @@ -0,0 +1,153 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If + not, write to the Free Software Foundation, Inc., + 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include <sysdep.h> +#include <features.h> + +#include "ucontext_i.h" + +/* __getcontext (const 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) + alloc r16 = ar.pfs, 1, 0, 3, 0 + + // sigprocmask (SIG_BLOCK, NULL, &sc->sc_mask): + + mov r2 = SC_MASK + mov r15 = __NR_rt_sigprocmask + ;; + mov out0 = SIG_BLOCK + mov out1 = 0 + add out2 = r2, in0 + + break __BREAK_SYSCALL + flushrs // save dirty partition on rbs + + mov.m rFPSR = ar.fpsr + mov.m rRSC = ar.rsc + add r2 = SC_GR+1*8, r32 + ;; + mov.m rBSP = ar.bsp + mov.m rUNAT = ar.unat + 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.i rPFS = ar.pfs + ;; +.mem.offset 0,0; st8.spill [r2] = r5, 16 +.mem.offset 8,0; st8.spill [r3] = r6 + add r3 = (SC_FR+3*16-(SC_GR+6*8)), r3 + ;; + st8.spill [r2] = r7, (SC_FR+2*16-(SC_GR+7*8)) + nop 0 + and rTMP = ~0x3, rRSC + ;; + 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 + ;; + add r2 = SC_NAT, r32 + nop 0 + 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 [r3] = rB2, 16 + st8 [r3] = rB3, 16 + ;; + st8 [r2] = rB4 + st8 [r3] = rB5 + ret +END(__getcontext) + +weak_alias(__getcontext, getcontext) |