diff options
Diffstat (limited to 'sysdeps/s390/s390-32/dl-trampoline.S')
| -rw-r--r-- | sysdeps/s390/s390-32/dl-trampoline.S | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/sysdeps/s390/s390-32/dl-trampoline.S b/sysdeps/s390/s390-32/dl-trampoline.S new file mode 100644 index 0000000000..fbbbc189db --- /dev/null +++ b/sysdeps/s390/s390-32/dl-trampoline.S @@ -0,0 +1,134 @@ +/* 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) + 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) + 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 |