162 lines
4.3 KiB
ArmAsm
162 lines
4.3 KiB
ArmAsm
/* Copyright (C) 1999, 2000, 2001, 2002, 2008 Free Software Foundation, Inc.
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Contributed by David Mosberger-Tang <davidm@hpl.hp.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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Note that __sigsetjmp() did NOT flush the register stack. Instead,
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we do it here since __longjmp() is usually much less frequently
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invoked than __sigsetjmp(). The only difficulty is that __sigsetjmp()
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didn't (and wouldn't be able to) save ar.rnat either. This is a problem
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because if we're not careful, we could end up loading random NaT bits.
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There are two cases:
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(i) ar.bsp < ia64_rse_rnat_addr(jmpbuf.ar_bsp)
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ar.rnat contains the desired bits---preserve ar.rnat
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across loadrs and write to ar.bspstore
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(ii) ar.bsp >= ia64_rse_rnat_addr(jmpbuf.ar_bsp)
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The desired ar.rnat is stored in
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ia64_rse_rnat_addr(jmpbuf.ar_bsp). Load those
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bits into ar.rnat after setting ar.bspstore. */
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# define pPos p6 /* is rotate count positive? */
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# define pNeg p7 /* is rotate count negative? */
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/* __longjmp(__jmp_buf buf, int val) */
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.text
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.global longjmp
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.proc longjmp
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longjmp:
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alloc r8=ar.pfs,2,1,0,0
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mov r27=ar.rsc
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add r2=0x98,in0 // r2 <- &jmpbuf.orig_jmp_buf_addr
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;;
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ld8 r8=[r2],-16 // r8 <- orig_jmp_buf_addr
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mov r10=ar.bsp
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and r11=~0x3,r27 // clear ar.rsc.mode
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;;
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flushrs // flush dirty regs to backing store (must be first in insn grp)
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ld8 r23=[r2],8 // r23 <- jmpbuf.ar_bsp
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sub r8=r8,in0 // r8 <- &orig_jmpbuf - &jmpbuf
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;;
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ld8 r25=[r2] // r25 <- jmpbuf.ar_unat
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extr.u r8=r8,3,6 // r8 <- (&orig_jmpbuf - &jmpbuf)/8 & 0x3f
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;;
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cmp.lt pNeg,pPos=r8,r0
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mov r2=in0
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;;
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(pPos) mov r16=r8
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(pNeg) add r16=64,r8
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(pPos) sub r17=64,r8
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(pNeg) sub r17=r0,r8
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;;
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mov ar.rsc=r11 // put RSE in enforced lazy mode
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shr.u r8=r25,r16
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add r3=8,in0 // r3 <- &jmpbuf.r1
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shl r9=r25,r17
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;;
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or r25=r8,r9
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;;
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mov r26=ar.rnat
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mov ar.unat=r25 // setup ar.unat (NaT bits for r1, r4-r7, and r12)
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;;
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ld8.fill.nta sp=[r2],16 // r12 (sp)
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ld8.fill.nta gp=[r3],16 // r1 (gp)
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dep r11=-1,r23,3,6 // r11 <- ia64_rse_rnat_addr(jmpbuf.ar_bsp)
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;;
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ld8.nta r16=[r2],16 // caller's unat
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ld8.nta r17=[r3],16 // fpsr
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;;
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ld8.fill.nta r4=[r2],16 // r4
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ld8.fill.nta r5=[r3],16 // r5 (gp)
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cmp.geu p8,p0=r10,r11 // p8 <- (ar.bsp >= jmpbuf.ar_bsp)
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;;
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ld8.fill.nta r6=[r2],16 // r6
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ld8.fill.nta r7=[r3],16 // r7
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;;
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mov ar.unat=r16 // restore caller's unat
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mov ar.fpsr=r17 // restore fpsr
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;;
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ld8.nta r16=[r2],16 // b0
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ld8.nta r17=[r3],16 // b1
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;;
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(p8) ld8 r26=[r11] // r26 <- *ia64_rse_rnat_addr(jmpbuf.ar_bsp)
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mov ar.bspstore=r23 // restore ar.bspstore
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;;
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ld8.nta r18=[r2],16 // b2
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ld8.nta r19=[r3],16 // b3
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;;
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ld8.nta r20=[r2],16 // b4
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ld8.nta r21=[r3],16 // b5
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;;
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ld8.nta r11=[r2],16 // ar.pfs
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ld8.nta r22=[r3],56 // ar.lc
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;;
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ld8.nta r24=[r2],32 // pr
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mov b0=r16
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;;
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ldf.fill.nta f2=[r2],32
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ldf.fill.nta f3=[r3],32
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mov b1=r17
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;;
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ldf.fill.nta f4=[r2],32
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ldf.fill.nta f5=[r3],32
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mov b2=r18
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;;
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ldf.fill.nta f16=[r2],32
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ldf.fill.nta f17=[r3],32
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mov b3=r19
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;;
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ldf.fill.nta f18=[r2],32
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ldf.fill.nta f19=[r3],32
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mov b4=r20
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;;
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ldf.fill.nta f20=[r2],32
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ldf.fill.nta f21=[r3],32
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mov b5=r21
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;;
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ldf.fill.nta f22=[r2],32
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ldf.fill.nta f23=[r3],32
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mov ar.lc=r22
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;;
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ldf.fill.nta f24=[r2],32
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ldf.fill.nta f25=[r3],32
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cmp.eq p8,p9=0,in1
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;;
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ldf.fill.nta f26=[r2],32
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ldf.fill.nta f27=[r3],32
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mov ar.pfs=r11
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;;
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ldf.fill.nta f28=[r2],32
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ldf.fill.nta f29=[r3],32
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;;
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ldf.fill.nta f30=[r2]
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ldf.fill.nta f31=[r3]
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(p8) mov r8=1
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mov ar.rnat=r26 // restore ar.rnat
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;;
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mov ar.rsc=r27 // restore ar.rsc
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(p9) mov r8=in1
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invala // virt. -> phys. regnum mapping may change
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mov pr=r24,-1
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br.ret.dptk.few rp
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.endp longjmp
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