mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
146 lines
4.4 KiB
ArmAsm
146 lines
4.4 KiB
ArmAsm
/* PLT trampolines. s390 version.
|
|
Copyright (C) 2005-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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/>. */
|
|
|
|
/* This code is used in dl-runtime.c to call the `fixup' function
|
|
and then redirect to the address it returns. */
|
|
|
|
/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
|
|
* with the following linkage:
|
|
* r2 - r6 : parameter registers
|
|
* f0, f2 : floating point parameter registers
|
|
* 24(r15), 28(r15) : PLT arguments PLT1, PLT2
|
|
* 96(r15) : additional stack parameters
|
|
* The normal clobber rules for function calls apply:
|
|
* r0 - r5 : call clobbered
|
|
* r6 - r13 : call saved
|
|
* r14 : return address (call clobbered)
|
|
* r15 : stack pointer (call saved)
|
|
* f4, f6 : call saved
|
|
* f0 - f3, f5, f7 - f15 : call clobbered
|
|
*/
|
|
|
|
#include <sysdep.h>
|
|
|
|
.text
|
|
.globl _dl_runtime_resolve
|
|
.type _dl_runtime_resolve, @function
|
|
cfi_startproc
|
|
.align 16
|
|
_dl_runtime_resolve:
|
|
stm %r2,%r5,32(%r15) # save registers
|
|
st %r14,8(%r15)
|
|
cfi_offset (r14, -88)
|
|
lr %r0,%r15 # create stack frame
|
|
ahi %r15,-96
|
|
cfi_adjust_cfa_offset (96)
|
|
st 0,0(%r15)
|
|
lm %r2,%r3,120(%r15) # load args saved by PLT
|
|
basr %r1,0
|
|
0: l %r14,1f-0b(%r1)
|
|
bas %r14,0(%r14,%r1) # call resolver
|
|
lr %r1,%r2 # function addr returned in r2
|
|
ahi %r15,96 # remove stack frame
|
|
cfi_adjust_cfa_offset (-96)
|
|
l %r14,8(15) # restore registers
|
|
lm %r2,%r5,32(%r15)
|
|
br %r1
|
|
1: .long _dl_fixup - 0b
|
|
cfi_endproc
|
|
.size _dl_runtime_resolve, .-_dl_runtime_resolve
|
|
|
|
|
|
#ifndef PROF
|
|
.globl _dl_runtime_profile
|
|
.type _dl_runtime_profile, @function
|
|
cfi_startproc
|
|
.align 16
|
|
_dl_runtime_profile:
|
|
stm %r2,%r6,32(%r15) # save registers
|
|
std %f0,56(%r15)
|
|
std %f2,64(%r15)
|
|
st %r6,8(%r15)
|
|
st %r12,12(%r15)
|
|
st %r14,16(%r15)
|
|
cfi_offset (r6, -64)
|
|
cfi_offset (f0, -40)
|
|
cfi_offset (f2, -32)
|
|
cfi_offset (r12, -84)
|
|
cfi_offset (r14, -80)
|
|
lr %r12,%r15 # create stack frame
|
|
cfi_def_cfa_register (12)
|
|
ahi %r15,-96
|
|
st %r12,0(%r15)
|
|
lm %r2,%r3,24(%r12) # load arguments saved by PLT
|
|
lr %r4,%r14 # return address as third parameter
|
|
basr %r1,0
|
|
0: l %r14,6f-0b(%r1)
|
|
la %r5,32(%r12) # pointer to struct La_s390_32_regs
|
|
la %r6,20(%r12) # long int * framesize
|
|
bas %r14,0(%r14,%r1) # call resolver
|
|
lr %r1,%r2 # function addr returned in r2
|
|
icm %r0,15,20(%r12) # load & test framesize
|
|
jnm 2f
|
|
|
|
lm %r2,%r6,32(%r12)
|
|
ld %f0,56(%r12)
|
|
ld %f2,64(%r12)
|
|
lr %r15,%r12 # remove stack frame
|
|
cfi_def_cfa_register (15)
|
|
l %r14,16(%r15) # restore registers
|
|
l %r12,12(%r15)
|
|
br %r1 # tail-call to the resolved function
|
|
|
|
cfi_def_cfa_register (12)
|
|
2: jz 4f # framesize == 0 ?
|
|
ahi %r0,7 # align framesize to 8
|
|
lhi %r2,-8
|
|
nr %r0,%r2
|
|
slr %r15,%r0 # make room for framesize bytes
|
|
st %r12,0(%r15)
|
|
la %r2,96(%r15)
|
|
la %r3,96(%r12)
|
|
srl %r0,3
|
|
3: mvc 0(8,%r2),0(%r3) # copy additional parameters
|
|
la %r2,8(%r2)
|
|
la %r3,8(%r3)
|
|
brct %r0,3b
|
|
4: lm %r2,%r6,32(%r12) # load register parameters
|
|
ld %f0,56(%r12)
|
|
ld %f2,64(%r12)
|
|
basr %r14,%r1 # call resolved function
|
|
stm %r2,%r3,72(%r12)
|
|
std %f0,80(%r12)
|
|
lm %r2,%r3,24(%r12) # load arguments saved by PLT
|
|
basr %r1,0
|
|
5: l %r14,7f-5b(%r1)
|
|
la %r4,32(%r12) # pointer to struct La_s390_32_regs
|
|
la %r5,72(%r12) # pointer to struct La_s390_32_retval
|
|
basr %r14,%r1 # call _dl_call_pltexit
|
|
|
|
lr %r15,%r12 # remove stack frame
|
|
cfi_def_cfa_register (15)
|
|
l %r14,16(%r15) # restore registers
|
|
l %r12,12(%r15)
|
|
br %r14
|
|
|
|
6: .long _dl_profile_fixup - 0b
|
|
7: .long _dl_call_pltexit - 5b
|
|
cfi_endproc
|
|
.size _dl_runtime_profile, .-_dl_runtime_profile
|
|
#endif
|