mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 11:41:07 +00:00
142 lines
4.5 KiB
ArmAsm
142 lines
4.5 KiB
ArmAsm
/* PLT trampolines. s390x version.
|
|
Copyright (C) 2005-2014 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/>. */
|
|
|
|
/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
|
|
* with the following linkage:
|
|
* r2 - r6 : parameter registers
|
|
* f0, f2, f4, f6 : floating point parameter registers
|
|
* 48(r15), 56(r15) : PLT arguments PLT1, PLT2
|
|
* 160(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)
|
|
* f1, f3, f5, f7 : 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:
|
|
stmg %r2,%r5,64(15) # save call-clobbered argument registers
|
|
stg %r14,96(15)
|
|
cfi_offset (r14, -64)
|
|
lgr %r0,%r15
|
|
aghi %r15,-160 # create stack frame
|
|
cfi_adjust_cfa_offset (160)
|
|
stg %r0,0(%r15) # write backchain
|
|
lmg %r2,%r3,208(%r15)# load args saved by PLT
|
|
brasl %r14,_dl_fixup # call fixup
|
|
lgr %r1,%r2 # function addr returned in r2
|
|
aghi %r15,160 # remove stack frame
|
|
cfi_adjust_cfa_offset (-160)
|
|
lg %r14,96(15) # restore registers
|
|
lmg %r2,%r5,64(15)
|
|
br %r1
|
|
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:
|
|
stmg %r2,%r6,64(%r15) # save call-clobbered arg regs
|
|
std %f0,104(%r15) # + r6 needed as arg for
|
|
std %f2,112(%r15) # _dl_profile_fixup
|
|
std %f4,120(%r15)
|
|
std %f6,128(%r15)
|
|
stg %r12,24(%r15) # r12 is used as backup of r15
|
|
stg %r14,32(%r15)
|
|
cfi_offset (r6, -96)
|
|
cfi_offset (f0, -56)
|
|
cfi_offset (f2, -48)
|
|
cfi_offset (f4, -40)
|
|
cfi_offset (f6, -32)
|
|
cfi_offset (r12, -136)
|
|
cfi_offset (r14, -128)
|
|
lgr %r12,%r15 # backup stack pointer
|
|
cfi_def_cfa_register (12)
|
|
aghi %r15,-160 # create stack frame
|
|
stg %r12,0(%r15) # save backchain
|
|
lmg %r2,%r3,48(%r12) # load arguments saved by PLT
|
|
lgr %r4,%r14 # return address as third parameter
|
|
la %r5,64(%r12) # pointer to struct La_s390_32_regs
|
|
la %r6,40(%r12) # long int * framesize
|
|
brasl %r14,_dl_profile_fixup # call resolver
|
|
lgr %r1,%r2 # function addr returned in r2
|
|
lg %r0,40(%r12) # load framesize
|
|
ltgr %r0,%r0
|
|
jnm 1f
|
|
|
|
lmg %r2,%r6,64(%r12) # framesize < 0 means no pltexit call
|
|
ld %f0,104(%r12) # so we can do a tail call without
|
|
ld %f2,112(%r12) # copying the arg overflow area
|
|
ld %f4,120(%r12)
|
|
ld %f6,128(%r12)
|
|
|
|
lgr %r15,%r12 # remove stack frame
|
|
cfi_def_cfa_register (15)
|
|
lg %r14,32(%r15) # restore registers
|
|
lg %r12,24(%r15)
|
|
br %r1 # tail-call to resolved function
|
|
|
|
cfi_def_cfa_register (12)
|
|
1: jz 4f # framesize == 0 ?
|
|
aghi %r0,7 # align framesize to 8
|
|
nill %r0,0xfff8
|
|
slgr %r15,%r0 # make room for framesize bytes
|
|
stg %r12,0(%r15)
|
|
la %r2,160(%r15)
|
|
la %r3,160(%r12)
|
|
srlg %r0,%r0,3
|
|
3: mvc 0(8,%r2),0(%r3) # copy additional parameters
|
|
la %r2,8(%r2)
|
|
la %r3,8(%r3)
|
|
brctg %r0,3b
|
|
4: lmg %r2,%r6,64(%r12) # load register parameters
|
|
ld %f0,104(%r12) # restore call-clobbered arg regs
|
|
ld %f2,112(%r12)
|
|
ld %f4,120(%r12)
|
|
ld %f6,128(%r12)
|
|
basr %r14,%r1 # call resolved function
|
|
stg %r2,136(%r12)
|
|
std %f0,144(%r12)
|
|
lmg %r2,%r3,48(%r12) # load arguments saved by PLT
|
|
la %r4,32(%r12) # pointer to struct La_s390_32_regs
|
|
la %r5,72(%r12) # pointer to struct La_s390_32_retval
|
|
brasl %r14,_dl_call_pltexit
|
|
|
|
lgr %r15,%r12 # remove stack frame
|
|
cfi_def_cfa_register (15)
|
|
lg %r14,32(%r15) # restore registers
|
|
lg %r12,24(%r15)
|
|
br %r14
|
|
|
|
cfi_endproc
|
|
.size _dl_runtime_profile, .-_dl_runtime_profile
|
|
#endif
|