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688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
539 lines
11 KiB
ArmAsm
539 lines
11 KiB
ArmAsm
/* PLT trampolines. ia64 version.
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Copyright (C) 2005-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#undef ret
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/*
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This code is used in dl-runtime.c to call the `_dl_fixup' function
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and then redirect to the address it returns. `_dl_fixup()' takes two
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arguments, however _dl_profile_fixup() takes five.
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The ABI specifies that we will never see more than 8 input
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registers to a function call, thus it is safe to simply allocate
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those, and simpler than playing stack games. */
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/* Used to save and restore 8 incoming fp registers */
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#define RESOLVE_FRAME_SIZE (16*8)
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ENTRY(_dl_runtime_resolve)
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{ .mmi
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.prologue
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.save ar.pfs, r40
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alloc loc0 = ar.pfs, 8, 6, 2, 0
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/* Use the 16 byte scratch area. r2 will start at f8 and
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r3 will start at f9. */
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adds r2 = -(RESOLVE_FRAME_SIZE - 16), r12
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adds r3 = -(RESOLVE_FRAME_SIZE - 32), r12
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}
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{ .mii
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.fframe RESOLVE_FRAME_SIZE
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adds r12 = -RESOLVE_FRAME_SIZE, r12
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.save rp, loc1
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mov loc1 = b0
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.body
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mov loc2 = r8 /* preserve struct value register */
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;;
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}
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{ .mii
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mov loc3 = r9 /* preserve language specific register */
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mov loc4 = r10 /* preserve language specific register */
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mov loc5 = r11 /* preserve language specific register */
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}
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{ .mmi
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stf.spill [r2] = f8, 32
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stf.spill [r3] = f9, 32
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mov out0 = r16
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;;
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}
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{ .mmi
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stf.spill [r2] = f10, 32
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stf.spill [r3] = f11, 32
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shl out1 = r15, 4
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;;
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}
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{ .mmi
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stf.spill [r2] = f12, 32
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stf.spill [r3] = f13, 32
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/* Relocation record is 24 byte. */
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shladd out1 = r15, 3, out1
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;;
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}
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{ .mmb
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stf.spill [r2] = f14
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stf.spill [r3] = f15
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br.call.sptk.many b0 = _dl_fixup
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}
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{ .mii
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/* Skip the 16byte scratch area. */
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adds r2 = 16, r12
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adds r3 = 32, r12
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mov b6 = ret0
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;;
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}
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{ .mmi
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ldf.fill f8 = [r2], 32
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ldf.fill f9 = [r3], 32
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mov b0 = loc1
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;;
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}
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{ .mmi
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ldf.fill f10 = [r2], 32
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ldf.fill f11 = [r3], 32
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mov gp = ret1
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;;
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}
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{ .mmi
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ldf.fill f12 = [r2], 32
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ldf.fill f13 = [r3], 32
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mov ar.pfs = loc0
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;;
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}
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{ .mmi
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ldf.fill f14 = [r2], 32
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ldf.fill f15 = [r3], 32
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.restore sp /* pop the unwind frame state */
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adds r12 = RESOLVE_FRAME_SIZE, r12
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;;
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}
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{ .mii
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mov r9 = loc3 /* restore language specific register */
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mov r10 = loc4 /* restore language specific register */
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mov r11 = loc5 /* restore language specific register */
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}
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{ .mii
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mov r8 = loc2 /* restore struct value register */
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;;
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}
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/* An alloc is needed for the break system call to work.
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We don't care about the old value of the pfs register. */
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{ .mmb
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.prologue
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.body
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alloc r2 = ar.pfs, 0, 0, 8, 0
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br.sptk.many b6
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;;
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}
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END(_dl_runtime_resolve)
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/* The fourth argument to _dl_profile_fixup and the third one to
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_dl_call_pltexit are a pointer to La_ia64_regs:
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8byte r8
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8byte r9
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8byte r10
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8byte r11
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8byte in0
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8byte in1
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8byte in2
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8byte in3
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8byte in4
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8byte in5
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8byte in6
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8byte in7
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16byte f8
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16byte f9
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16byte f10
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16byte f11
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16byte f12
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16byte f13
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16byte f14
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16byte f15
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8byte ar.unat
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8byte sp
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The fifth argument to _dl_profile_fixup is a pointer to long int.
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The fourth argument to _dl_call_pltexit is a pointer to
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La_ia64_retval:
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8byte r8
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8byte r9
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8byte r10
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8byte r11
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16byte f8
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16byte f9
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16byte f10
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16byte f11
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16byte f12
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16byte f13
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16byte f14
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16byte f15
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Since stack has to be 16 byte aligned, the stack allocation is in
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16byte increment. Before calling _dl_profile_fixup, the stack will
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look like
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psp new frame_size
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+16 La_ia64_regs
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sp scratch
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*/
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#define PLTENTER_FRAME_SIZE (4*8 + 8*8 + 8*16 + 2*8 + 16)
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#define PLTEXIT_FRAME_SIZE (PLTENTER_FRAME_SIZE + 4*8 + 8*16)
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#ifndef PROF
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ENTRY(_dl_runtime_profile)
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{ .mii
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.prologue
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.save ar.pfs, r40
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alloc loc0 = ar.pfs, 8, 12, 8, 0
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.vframe loc10
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mov loc10 = r12
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.save rp, loc1
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mov loc1 = b0
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}
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{ .mii
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.save ar.unat, r17
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mov r17 = ar.unat
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.save ar.lc, loc6
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mov loc6 = ar.lc
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mov loc11 = gp
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}
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{ .mii
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.body
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/* There is a 16 byte scratch area. r2 will start at r8 and
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r3 will start at r9 for La_ia64_regs. */
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adds r2 = -(PLTENTER_FRAME_SIZE - 16), r12
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adds r3 = -(PLTENTER_FRAME_SIZE - 24), r12
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adds r12 = -PLTENTER_FRAME_SIZE, r12
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;;
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}
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{ .mmi
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st8 [r2] = r8, 16;
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st8 [r3] = r9, 16;
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mov out2 = b0 /* needed by _dl_fixup_profile */
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;;
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}
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{ .mmi
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st8 [r2] = r10, 16;
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st8 [r3] = r11, 16;
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adds out3 = 16, r12 /* pointer to La_ia64_regs */
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;;
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}
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{ .mmi
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.mem.offset 0, 0
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st8.spill [r2] = in0, 16
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.mem.offset 8, 0
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st8.spill [r3] = in1, 16
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mov out4 = loc10 /* pointer to new frame size */
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;;
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}
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{ .mmi
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.mem.offset 0, 0
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st8.spill [r2] = in2, 16
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.mem.offset 8, 0
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st8.spill [r3] = in3, 16
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mov loc2 = r8 /* preserve struct value register */
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;;
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}
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{ .mmi
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.mem.offset 0, 0
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st8.spill [r2] = in4, 16
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.mem.offset 8, 0
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st8.spill [r3] = in5, 16
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mov loc3 = r9 /* preserve language specific register */
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;;
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}
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{ .mmi
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.mem.offset 0, 0
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st8 [r2] = in6, 16
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.mem.offset 8, 0
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st8 [r3] = in7, 24 /* adjust for f9 */
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mov loc4 = r10 /* preserve language specific register */
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;;
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}
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{ .mii
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mov r18 = ar.unat /* save it in La_ia64_regs */
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mov loc7 = out3 /* save it for _dl_call_pltexit */
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mov loc5 = r11 /* preserve language specific register */
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}
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{ .mmi
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stf.spill [r2] = f8, 32
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stf.spill [r3] = f9, 32
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mov out0 = r16 /* needed by _dl_fixup_profile */
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;;
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}
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{ .mii
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mov ar.unat = r17 /* restore it for function call */
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mov loc8 = r16 /* save it for _dl_call_pltexit */
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nop.i 0x0
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}
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{ .mmi
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stf.spill [r2] = f10, 32
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stf.spill [r3] = f11, 32
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shl out1 = r15, 4
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;;
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}
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{ .mmi
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stf.spill [r2] = f12, 32
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stf.spill [r3] = f13, 32
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/* Relocation record is 24 byte. */
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shladd out1 = r15, 3, out1
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;;
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}
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{ .mmi
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stf.spill [r2] = f14, 32
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stf.spill [r3] = f15, 24
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mov loc9 = out1 /* save it for _dl_call_pltexit */
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;;
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}
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{ .mmb
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st8 [r2] = r18 /* store ar.unat */
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st8 [r3] = loc10 /* store sp */
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br.call.sptk.many b0 = _dl_profile_fixup
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}
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{ .mii
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/* Skip the 16byte scratch area, 4 language specific GRs and
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8 incoming GRs to restore incoming fp registers. */
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adds r2 = (4*8 + 8*8 + 16), r12
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adds r3 = (4*8 + 8*8 + 32), r12
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mov b6 = ret0
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;;
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}
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{ .mmi
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ldf.fill f8 = [r2], 32
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ldf.fill f9 = [r3], 32
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mov gp = ret1
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;;
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}
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{ .mmi
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ldf.fill f10 = [r2], 32
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ldf.fill f11 = [r3], 32
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mov r8 = loc2 /* restore struct value register */
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;;
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}
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{ .mmi
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ldf.fill f12 = [r2], 32
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ldf.fill f13 = [r3], 32
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mov r9 = loc3 /* restore language specific register */
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;;
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}
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{ .mmi
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ldf.fill f14 = [r2], 32
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ldf.fill f15 = [r3], 32
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mov r10 = loc4 /* restore language specific register */
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;;
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}
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{ .mii
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ld8 r15 = [loc10] /* load the new frame size */
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mov r11 = loc5 /* restore language specific register */
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;;
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cmp.eq p6, p7 = -1, r15
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;;
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}
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{ .mii
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(p7) cmp.eq p8, p9 = 0, r15
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(p6) mov b0 = loc1
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(p6) mov ar.lc = loc6
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}
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{ .mib
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nop.m 0x0
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(p6) mov ar.pfs = loc0
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(p6) br.cond.dptk.many .Lresolved
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;;
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}
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/* At this point, the stack looks like
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+psp free
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+16 La_ia64_regs
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sp scratch
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We need to keep the current stack and call the resolved
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function by copying the r15 byte from sp + PLTENTER_FRAME_SIZE
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+ 16 (scratch area) to sp + 16 (scratch area). Since stack
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has to be 16byte aligned, we around r15 up to 16byte. */
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{ .mbb
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(p9) adds r15 = 15, r15
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(p8) br.cond.dptk.many .Lno_new_frame
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nop.b 0x0
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;;
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}
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{ .mmi
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and r15 = -16, r15
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;;
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/* We don't copy the 16byte scatch area. Prepare r16/r17 as
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destination. */
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sub r16 = r12, r15
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sub r17 = r12, r15
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;;
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}
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{ .mii
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adds r16 = 16, r16
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adds r17 = 24, r17
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sub r12 = r12, r15 /* Adjust stack */
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;;
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}
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{ .mii
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nop.m 0x0
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shr r15 = r15, 4
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;;
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adds r15 = -1, r15
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;;
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}
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{ .mii
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/* Skip the 16byte scatch area. Prepare r2/r3 as source. */
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adds r2 = 16, loc10
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adds r3 = 24, loc10
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mov ar.lc = r15
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;;
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}
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.Lcopy:
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{ .mmi
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ld8 r18 = [r2], 16
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ld8 r19 = [r3], 16
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nop.i 0x0
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;;
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}
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{ .mmb
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st8 [r16] = r18, 16
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st8 [r17] = r19, 16
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br.cloop.sptk.few .Lcopy
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}
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.Lno_new_frame:
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{ .mii
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mov out0 = in0
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mov out1 = in1
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mov out2 = in2
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}
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{ .mii
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mov out3 = in3
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mov out4 = in4
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mov out5 = in5
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}
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{ .mib
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mov out6 = in6
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mov out7 = in7
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/* Call the resolved function */
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br.call.sptk.many b0 = b6
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}
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{ .mii
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/* Prepare stack for _dl_call_pltexit. Loc10 has the original
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stack pointer. */
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adds r12 = -PLTEXIT_FRAME_SIZE, loc10
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adds r2 = -(PLTEXIT_FRAME_SIZE - 16), loc10
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adds r3 = -(PLTEXIT_FRAME_SIZE - 24), loc10
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;;
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}
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{ .mmi
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/* Load all possible return values into buffer. */
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st8 [r2] = r8, 16
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st8 [r3] = r9, 16
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mov out0 = loc8
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;;
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}
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{ .mmi
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st8 [r2] = r10, 16
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st8 [r3] = r11, 24
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mov out1 = loc9
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;;
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}
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{ .mmi
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stf.spill [r2] = f8, 32
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stf.spill [r3] = f9, 32
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mov out2 = loc7 /* Pointer to La_ia64_regs */
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;;
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}
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{ .mmi
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stf.spill [r2] = f10, 32
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stf.spill [r3] = f11, 32
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adds out3 = 16, r12 /* Pointer to La_ia64_retval */
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;;
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}
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{ .mmi
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stf.spill [r2] = f12, 32
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stf.spill [r3] = f13, 32
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/* We need to restore gp for _dl_call_pltexit. */
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mov gp = loc11
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;;
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}
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{ .mmb
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stf.spill [r2] = f14
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stf.spill [r3] = f15
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br.call.sptk.many b0 = _dl_call_pltexit
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}
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{ .mmi
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/* Load all the non-floating and floating return values. Skip
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the 16byte scratch area. */
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adds r2 = 16, r12
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adds r3 = 24, r12
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nop.i 0x0
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;;
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}
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{ .mmi
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ld8 r8 = [r2], 16
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ld8 r9 = [r3], 16
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nop.i 0x0
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;;
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}
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{ .mmi
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ld8 r10 = [r2], 16
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ld8 r11 = [r3], 24
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nop.i 0x0
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;;
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}
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{ .mmi
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ldf.fill f8 = [r2], 32
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ldf.fill f9 = [r3], 32
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mov ar.lc = loc6
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;;
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}
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{ .mmi
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ldf.fill f10 = [r2], 32
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ldf.fill f11 = [r3], 32
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mov ar.pfs = loc0
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;;
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}
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{ .mmi
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ldf.fill f12 = [r2], 32
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ldf.fill f13 = [r3], 32
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mov b0 = loc1
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;;
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}
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{ .mmi
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ldf.fill f14 = [r2]
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ldf.fill f15 = [r3]
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/* We know that the previous stack pointer, loc10, isn't 0.
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We use it to reload p7. */
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cmp.ne p7, p0 = 0, loc10
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;;
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}
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.Lresolved:
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{ .mmb
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.restore sp
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mov r12 = loc10
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(p7) br.ret.sptk.many b0
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;;
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}
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/* An alloc is needed for the break system call to work. We
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don't care about the old value of the pfs register. After
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this alloc, we can't use any rotating registers. Otherwise
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assembler won't be happy. This has to be at the end. */
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{ .mmb
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.prologue
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.body
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alloc r2 = ar.pfs, 0, 0, 8, 0
|
|
br.sptk.many b6
|
|
;;
|
|
}
|
|
END(_dl_runtime_profile)
|
|
#endif
|