| /* PLT trampolines. s390 version. |
| Copyright (C) 2005 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| /* 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 |
| * 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 |
| */ |
| |
| #include <sysdep.h> |
| |
| .text |
| .globl _dl_runtime_resolve |
| .type _dl_runtime_resolve, @function |
| cfi_startproc |
| .align 16 |
| _dl_runtime_resolve: |
| stm %r2,%r5,32(%r15) # save registers |
| st %r14,8(%r15) |
| cfi_offset (r14, -88) |
| lr %r0,%r15 # create stack frame |
| ahi %r15,-96 |
| cfi_adjust_cfa_offset (96) |
| st 0,0(%r15) |
| lm %r2,%r3,120(%r15) # load args saved by PLT |
| basr %r1,0 |
| 0: l %r14,1f-0b(%r1) |
| bas %r14,0(%r14,%r1) # call resolver |
| lr %r1,%r2 # function addr returned in r2 |
| ahi %r15,96 # remove stack frame |
| cfi_adjust_cfa_offset (-96) |
| l %r14,8(15) # restore registers |
| 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: |
| stm %r2,%r6,32(%r15) # save registers |
| std %f0,56(%r15) |
| std %f2,64(%r15) |
| st %r6,8(%r15) |
| st %r12,12(%r15) |
| st %r14,16(%r15) |
| cfi_offset (r6, -64) |
| cfi_offset (f0, -40) |
| cfi_offset (f2, -32) |
| cfi_offset (r12, -84) |
| cfi_offset (r14, -80) |
| lr %r12,%r15 # create stack frame |
| cfi_def_cfa_register (12) |
| ahi %r15,-96 |
| st %r12,0(%r15) |
| 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 %r5,32(%r12) # 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 |
| icm %r0,15,20(%r12) # load & test framesize |
| jnm 2f |
| lm %r2,%r6,32(%r12) |
| ld %f0,56(%r12) |
| ld %f2,64(%r12) |
| basr %r14,%r1 # call resolved function |
| 1: lr %r15,%r12 # remove stack frame |
| cfi_def_cfa_register (15) |
| l %r14,16(%r15) # restore registers |
| l %r12,12(%r15) |
| l %r6,8(%r15) |
| br %r14 |
| cfi_def_cfa_register (12) |
| 2: 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) |
| 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,%r6,32(%r12) # load register parameters |
| ld %f0,56(%r12) |
| ld %f2,64(%r12) |
| basr %r14,%r1 # call resolved function |
| stm %r2,%r3,72(%r12) |
| std %f0,80(%r12) |
| lm %r2,%r3,24(%r12) # load arguments saved by PLT |
| basr %r1,0 |
| 5: l %r14,7f-5b(%r1) |
| la %r4,32(%r12) # pointer to struct La_s390_32_regs |
| la %r5,72(%r12) # pointer to struct La_s390_32_retval |
| basr %r14,%r1 # call _dl_call_pltexit |
| j 1b |
| 6: .long _dl_profile_fixup - 0b |
| 7: .long _dl_call_pltexit - 5b |
| cfi_endproc |
| .size _dl_runtime_profile, .-_dl_runtime_profile |
| #endif |
