| /* 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 |
| <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 |
| * 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 |
