| /* PLT trampolines. s390 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/>. */ |
| |
| /* 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 |
| * v24, v26, v28, v30, v25, v27, v29, v31 : vector 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 |
| * v0 - v3, v5, v7 - v15 : bytes 0-7 overlap with fprs: call clobbered |
| bytes 8-15: call clobbered |
| * v4, v6 : bytes 0-7 overlap with f4, f6: 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: |
| stm %r2,%r5,32(%r15) # save registers |
| cfi_offset (r2, -64) |
| cfi_offset (r3, -60) |
| cfi_offset (r4, -56) |
| cfi_offset (r5, -52) |
| stm %r14,%r15,48(%r15) |
| cfi_offset (r14, -48) |
| cfi_offset (r15, -44) |
| std %f0,56(%r15) |
| cfi_offset (f0, -40) |
| std %f2,64(%r15) |
| cfi_offset (f2, -32) |
| lr %r0,%r15 |
| lm %r2,%r3,24(%r15) # load args saved by PLT |
| #ifdef RESTORE_VRS |
| ahi %r15,-224 # create stack frame |
| cfi_adjust_cfa_offset (224) |
| .machine push |
| .machine "z13" |
| .machinemode "zarch_nohighgprs" |
| vstm %v24,%v31,96(%r15) # store call-clobbered vr arguments |
| cfi_offset (v24, -224) |
| cfi_offset (v25, -208) |
| cfi_offset (v26, -192) |
| cfi_offset (v27, -176) |
| cfi_offset (v28, -160) |
| cfi_offset (v29, -144) |
| cfi_offset (v30, -128) |
| cfi_offset (v31, -112) |
| .machine pop |
| #else |
| ahi %r15,-96 # create stack frame |
| cfi_adjust_cfa_offset (96) |
| #endif |
| st %r0,0(%r15) # write backchain |
| basr %r1,0 |
| 0: l %r14,1f-0b(%r1) |
| bas %r14,0(%r14,%r1) # call _dl_fixup |
| lr %r1,%r2 # function addr returned in r2 |
| #ifdef RESTORE_VRS |
| .machine push |
| .machine "z13" |
| .machinemode "zarch_nohighgprs" |
| vlm %v24,%v31,96(%r15) # restore vector registers |
| .machine pop |
| lm %r14,%r15,272(%r15)# remove stack frame and restore registers |
| #else |
| lm %r14,%r15,144(%r15)# remove stack frame and restore registers |
| #endif |
| cfi_def_cfa_offset (96) |
| ld %f0,56(%r15) |
| ld %f2,64(%r15) |
| 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: |
| st %r12,12(%r15) # r12 is used as backup of r15 |
| cfi_offset (r12, -84) |
| st %r14,16(%r15) |
| cfi_offset (r14, -80) |
| lr %r12,%r15 # backup stack pointer |
| cfi_def_cfa_register (12) |
| ahi %r15,-264 # create stack frame: |
| # 96 + sizeof(La_s390_32_regs) |
| st %r12,0(%r15) # save backchain |
| |
| stm %r2,%r6,96(%r15) # save registers |
| cfi_offset (r2, -264) # + r6 needed as arg for |
| cfi_offset (r3, -260) # _dl_profile_fixup |
| cfi_offset (r4, -256) |
| cfi_offset (r5, -252) |
| cfi_offset (r6, -248) |
| std %f0,120(%r15) |
| cfi_offset (f0, -240) |
| std %f2,128(%r15) |
| cfi_offset (f2, -232) |
| #ifdef RESTORE_VRS |
| .machine push |
| .machine "z13" |
| .machinemode "zarch_nohighgprs" |
| vstm %v24,%v31,136(%r15) # store call-clobbered vr arguments |
| cfi_offset (v24, -224) |
| cfi_offset (v25, -208) |
| cfi_offset (v26, -192) |
| cfi_offset (v27, -176) |
| cfi_offset (v28, -160) |
| cfi_offset (v29, -144) |
| cfi_offset (v30, -128) |
| cfi_offset (v31, -112) |
| .machine pop |
| #endif |
| |
| 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 %r5,96(%r15) # 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 |
| ld %f0,120(%r15) # restore call-clobbered arg fprs |
| ld %f2,128(%r15) |
| #ifdef RESTORE_VRS |
| .machine push |
| .machine "z13" |
| .machinemode "zarch_nohighgprs" |
| vlm %v24,%v31,136(%r15) # restore call-clobbered arg vrs |
| .machine pop |
| #endif |
| icm %r0,15,20(%r12) # load & test framesize |
| jnm 2f |
| |
| lm %r2,%r6,96(%r15) # framesize < 0 means no pltexit call |
| # so we can do a tail call without |
| # copying the arg overflow area |
| 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: la %r4,96(%r15) # pointer to struct La_s390_32_regs |
| st %r4,32(%r12) |
| 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) # save backchain |
| 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,%r6,0(%r4) # load register parameters |
| basr %r14,%r1 # call resolved function |
| stm %r2,%r3,40(%r12) # store return values r2, r3, f0 |
| std %f0,48(%r12) # to struct La_s390_32_retval |
| #ifdef RESTORE_VRS |
| .machine push |
| .machine "z13" |
| vst %v24,56(%r12) # store return value v24 |
| .machine pop |
| #endif |
| lm %r2,%r4,24(%r12) # r2, r3: load arguments saved by PLT |
| # r4: pointer to struct La_s390_32_regs |
| basr %r1,0 |
| 5: l %r14,7f-5b(%r1) |
| la %r5,40(%r12) # pointer to struct La_s390_32_retval |
| bas %r14,0(%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) |
| lm %r2,%r3,40(%r15) # restore return values |
| ld %f0,48(%r15) |
| #ifdef RESTORE_VRS |
| .machine push |
| .machine "z13" |
| vl %v24,56(%r15) # restore return value v24 |
| .machine pop |
| #endif |
| br %r14 |
| |
| 6: .long _dl_profile_fixup - 0b |
| 7: .long _dl_call_pltexit - 5b |
| cfi_endproc |
| .size _dl_runtime_profile, .-_dl_runtime_profile |
| #endif |
