/* PLT trampolines. s390x version. Copyright (C) 2016-2018 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 . */ /* 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 * v24, v26, v28, v30, v25, v27, v29, v31 : vector 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) * f0 - f7 : call clobbered * f8 - f15 : call saved * v0 - v7 : bytes 0-7 overlap with f0-f7: call clobbered bytes 8-15: call clobbered * v8 - v15 : bytes 0-7 overlap with f8-f15: call saved bytes 8-15: call clobbered * v16 - v31 : call clobbered */ .globl _dl_runtime_resolve .type _dl_runtime_resolve, @function cfi_startproc .align 16 _dl_runtime_resolve: stmg %r2,%r5,64(%r15) # save call-clobbered argument registers cfi_offset (r2, -96) cfi_offset (r3, -88) cfi_offset (r4, -80) cfi_offset (r5, -72) stmg %r14,%r15,96(%r15) cfi_offset (r14, -64) cfi_offset (r15, -56) std %f0,112(%r15) cfi_offset (f0, -48) std %f2,120(%r15) cfi_offset (f2, -40) std %f4,128(%r15) cfi_offset (f4, -32) std %f6,136(%r15) cfi_offset (f6, -24) lmg %r2,%r3,48(%r15) # load args for fixup saved by PLT lgr %r0,%r15 #ifdef RESTORE_VRS aghi %r15,-288 # create stack frame cfi_adjust_cfa_offset (288) .machine push .machine "z13" vstm %v24,%v31,160(%r15)# store call-clobbered vector argument registers cfi_offset (v24, -288) cfi_offset (v25, -272) cfi_offset (v26, -256) cfi_offset (v27, -240) cfi_offset (v28, -224) cfi_offset (v29, -208) cfi_offset (v30, -192) cfi_offset (v31, -176) .machine pop #else aghi %r15,-160 # create stack frame cfi_adjust_cfa_offset (160) #endif stg %r0,0(%r15) # write backchain brasl %r14,_dl_fixup # call _dl_fixup lgr %r1,%r2 # function addr returned in r2 #ifdef RESTORE_VRS .machine push .machine "z13" vlm %v24,%v31,160(%r15)# restore vector registers .machine pop lmg %r14,%r15,384(%r15)# remove stack frame and restore registers #else lmg %r14,%r15,256(%r15)# remove stack frame and restore registers #endif cfi_def_cfa_offset (160) ld %f0,112(%r15) ld %f2,120(%r15) ld %f4,128(%r15) ld %f6,136(%r15) lmg %r2,%r5,64(%r15) 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: stg %r12,24(%r15) # r12 is used as backup of r15 cfi_offset (r12, -136) stg %r14,32(%r15) cfi_offset (r14, -128) lgr %r12,%r15 # backup stack pointer cfi_def_cfa_register (12) aghi %r15,-360 # create stack frame: # 160 + sizeof(La_s390_64_regs) stg %r12,0(%r15) # save backchain stmg %r2,%r6,160(%r15) # save call-clobbered arg regs cfi_offset (r2, -360) # + r6 needed as arg for cfi_offset (r3, -352) # _dl_profile_fixup cfi_offset (r4, -344) cfi_offset (r5, -336) cfi_offset (r6, -328) std %f0,200(%r15) cfi_offset (f0, -320) std %f2,208(%r15) cfi_offset (f2, -312) std %f4,216(%r15) cfi_offset (f4, -304) std %f6,224(%r15) cfi_offset (f6, -296) #ifdef RESTORE_VRS .machine push .machine "z13" vstm %v24,%v31,232(%r15) # store call-clobbered vector arguments cfi_offset (v24, -288) cfi_offset (v25, -272) cfi_offset (v26, -256) cfi_offset (v27, -240) cfi_offset (v28, -224) cfi_offset (v29, -208) cfi_offset (v30, -192) cfi_offset (v31, -176) .machine pop #endif lmg %r2,%r3,48(%r12) # load arguments saved by PLT lgr %r4,%r14 # return address as third parameter la %r5,160(%r15) # pointer to struct La_s390_64_regs la %r6,40(%r12) # long int * framesize brasl %r14,_dl_profile_fixup # call resolver lgr %r1,%r2 # function addr returned in r2 ld %f0,200(%r15) # restore call-clobbered arg fprs ld %f2,208(%r15) ld %f4,216(%r15) ld %f6,224(%r15) #ifdef RESTORE_VRS .machine push .machine "z13" vlm %v24,%v31,232(%r15) # restore call-clobbered arg vrs .machine pop #endif lg %r0,40(%r12) # load framesize ltgr %r0,%r0 jnm 1f lmg %r2,%r6,160(%r15) # framesize < 0 means no pltexit call # so we can do a tail call without # copying the arg overflow area 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: la %r4,160(%r15) # pointer to struct La_s390_64_regs stg %r4,64(%r12) 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) # save backchain 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) # depending on framesize la %r3,8(%r3) brctg %r0,3b 4: lmg %r2,%r6,0(%r4) # restore call-clobbered arg gprs basr %r14,%r1 # call resolved function stg %r2,72(%r12) # store return values r2, f0 std %f0,80(%r12) # to struct La_s390_64_retval #ifdef RESTORE_VRS .machine push .machine "z13" vst %v24,88(%r12) # store return value v24 .machine pop #endif lmg %r2,%r4,48(%r12) # r2, r3: load arguments saved by PLT # r4: pointer to struct La_s390_64_regs la %r5,72(%r12) # pointer to struct La_s390_64_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) lg %r2,72(%r15) # restore return values ld %f0,80(%r15) #ifdef RESTORE_VRS .machine push .machine "z13" vl %v24,88(%r15) # restore return value v24 .machine pop #endif br %r14 # Jump back to caller cfi_endproc .size _dl_runtime_profile, .-_dl_runtime_profile #endif