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142 lines
4.5 KiB
ArmAsm
142 lines
4.5 KiB
ArmAsm
/* PLT trampolines. s390x version.
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Copyright (C) 2005-2015 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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/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
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* with the following linkage:
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* r2 - r6 : parameter registers
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* f0, f2, f4, f6 : floating point parameter registers
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* 48(r15), 56(r15) : PLT arguments PLT1, PLT2
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* 160(r15) : additional stack parameters
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* The normal clobber rules for function calls apply:
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* r0 - r5 : call clobbered
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* r6 - r13 : call saved
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* r14 : return address (call clobbered)
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* r15 : stack pointer (call saved)
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* f1, f3, f5, f7 : call saved
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* f0 - f3, f5, f7 - f15 : call clobbered
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*/
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#include <sysdep.h>
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.text
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.globl _dl_runtime_resolve
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.type _dl_runtime_resolve, @function
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cfi_startproc
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.align 16
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_dl_runtime_resolve:
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stmg %r2,%r5,64(15) # save call-clobbered argument registers
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stg %r14,96(15)
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cfi_offset (r14, -64)
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lgr %r0,%r15
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aghi %r15,-160 # create stack frame
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cfi_adjust_cfa_offset (160)
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stg %r0,0(%r15) # write backchain
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lmg %r2,%r3,208(%r15)# load args saved by PLT
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brasl %r14,_dl_fixup # call fixup
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lgr %r1,%r2 # function addr returned in r2
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aghi %r15,160 # remove stack frame
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cfi_adjust_cfa_offset (-160)
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lg %r14,96(15) # restore registers
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lmg %r2,%r5,64(15)
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br %r1
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cfi_endproc
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.size _dl_runtime_resolve, .-_dl_runtime_resolve
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#ifndef PROF
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.globl _dl_runtime_profile
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.type _dl_runtime_profile, @function
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cfi_startproc
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.align 16
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_dl_runtime_profile:
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stmg %r2,%r6,64(%r15) # save call-clobbered arg regs
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std %f0,104(%r15) # + r6 needed as arg for
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std %f2,112(%r15) # _dl_profile_fixup
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std %f4,120(%r15)
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std %f6,128(%r15)
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stg %r12,24(%r15) # r12 is used as backup of r15
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stg %r14,32(%r15)
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cfi_offset (r6, -96)
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cfi_offset (f0, -56)
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cfi_offset (f2, -48)
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cfi_offset (f4, -40)
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cfi_offset (f6, -32)
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cfi_offset (r12, -136)
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cfi_offset (r14, -128)
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lgr %r12,%r15 # backup stack pointer
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cfi_def_cfa_register (12)
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aghi %r15,-160 # create stack frame
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stg %r12,0(%r15) # save backchain
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lmg %r2,%r3,48(%r12) # load arguments saved by PLT
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lgr %r4,%r14 # return address as third parameter
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la %r5,64(%r12) # pointer to struct La_s390_32_regs
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la %r6,40(%r12) # long int * framesize
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brasl %r14,_dl_profile_fixup # call resolver
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lgr %r1,%r2 # function addr returned in r2
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lg %r0,40(%r12) # load framesize
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ltgr %r0,%r0
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jnm 1f
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lmg %r2,%r6,64(%r12) # framesize < 0 means no pltexit call
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ld %f0,104(%r12) # so we can do a tail call without
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ld %f2,112(%r12) # copying the arg overflow area
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ld %f4,120(%r12)
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ld %f6,128(%r12)
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lgr %r15,%r12 # remove stack frame
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cfi_def_cfa_register (15)
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lg %r14,32(%r15) # restore registers
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lg %r12,24(%r15)
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br %r1 # tail-call to resolved function
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cfi_def_cfa_register (12)
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1: jz 4f # framesize == 0 ?
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aghi %r0,7 # align framesize to 8
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nill %r0,0xfff8
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slgr %r15,%r0 # make room for framesize bytes
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stg %r12,0(%r15)
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la %r2,160(%r15)
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la %r3,160(%r12)
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srlg %r0,%r0,3
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3: mvc 0(8,%r2),0(%r3) # copy additional parameters
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la %r2,8(%r2)
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la %r3,8(%r3)
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brctg %r0,3b
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4: lmg %r2,%r6,64(%r12) # load register parameters
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ld %f0,104(%r12) # restore call-clobbered arg regs
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ld %f2,112(%r12)
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ld %f4,120(%r12)
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ld %f6,128(%r12)
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basr %r14,%r1 # call resolved function
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stg %r2,136(%r12)
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std %f0,144(%r12)
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lmg %r2,%r3,48(%r12) # load arguments saved by PLT
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la %r4,32(%r12) # pointer to struct La_s390_32_regs
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la %r5,72(%r12) # pointer to struct La_s390_32_retval
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brasl %r14,_dl_call_pltexit
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lgr %r15,%r12 # remove stack frame
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cfi_def_cfa_register (15)
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lg %r14,32(%r15) # restore registers
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lg %r12,24(%r15)
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br %r14
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cfi_endproc
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.size _dl_runtime_profile, .-_dl_runtime_profile
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#endif
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