diff options
Diffstat (limited to 'sysdeps/s390/s390-64/dl-trampoline.S')
| -rw-r--r-- | sysdeps/s390/s390-64/dl-trampoline.S | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/sysdeps/s390/s390-64/dl-trampoline.S b/sysdeps/s390/s390-64/dl-trampoline.S new file mode 100644 index 0000000000..215d869803 --- /dev/null +++ b/sysdeps/s390/s390-64/dl-trampoline.S @@ -0,0 +1,126 @@ +/* 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. */ + +/* 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 + * 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) + * f1, f3, f5, f7 : 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: + stmg 2,5,64(15) # save registers + stg 14,96(15) + lgr 0,15 # create stack frame + aghi 15,-160 + cfi_adjust_cfa_offset (160) + stg 0,0(15) + lmg 2,3,208(15) # load args saved by PLT + brasl 14,_dl_fixup # call fixup + lgr 1,2 # function addr returned in r2 + aghi 15,160 # remove stack frame + cfi_adjust_cfa_offset (-160) + lg 14,96(15) # restore registers + lmg 2,5,64(15) + br 1 + cfi_endproc + .size _dl_runtime_resolve, .-_dl_runtime_resolve + + + .globl _dl_runtime_profile + .type _dl_runtime_profile, @function + cfi_startproc + .align 16 +_dl_runtime_profile: + stmg %r2,%r6,64(%r15) # save registers + std %f0,104(%r15) + std %f2,112(%r15) + std %f4,120(%r15) + std %f6,128(%r15) + stg %r6,16(%r15) + stg %r12,24(%r15) + stg %r14,32(%r15) + lgr %r12,%r15 # create stack frame + cfi_def_cfa_register (12) + aghi %r15,-160 + stg %r12,0(%r15) + lmg %r2,%r3,48(%r12) # load arguments saved by PLT + lgr %r4,%r14 # return address as third parameter + la %r5,64(%r12) # pointer to struct La_s390_32_regs + la %r6,40(%r12) # long int * framesize + brasl %r14,_dl_profile_fixup # call resolver + lgr %r1,%r2 # function addr returned in r2 + lg %r0,40(%r12) # load framesize + ltgr %r0,%r0 + jnm 1f + lmg %r2,%r6,64(%r12) + ld %f0,104(%r12) + ld %f2,112(%r12) + ld %f4,120(%r12) + ld %f6,128(%r12) + basr %r14,%r1 # call resolved function +0: lr %r15,%r12 # remove stack frame + cfi_def_cfa_register (15) + lg %r14,32(%r15) # restore registers + lg %r12,24(%r15) + lg %r6,16(%r15) + br %r14 + cfi_def_cfa_register (12) +1: 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) + 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) + la %r3,8(%r3) + brctg %r0,3b +4: lmg %r2,%r6,64(%r12) # load register parameters + ld %f0,104(%r12) + ld %f2,112(%r12) + ld %f4,120(%r12) + ld %f6,128(%r12) + basr %r14,%r1 # call resolved function + stg %r2,136(%r12) + std %f0,144(%r12) + lmg %r2,%r3,48(%r12) # load arguments saved by PLT + la %r4,32(%r12) # pointer to struct La_s390_32_regs + la %r5,72(%r12) # pointer to struct La_s390_32_retval + brasl %r14,_dl_call_pltexit + j 0b + cfi_endproc + .size _dl_runtime_profile, .-_dl_runtime_profile |