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5cdd1989d1
Starting with z13, vector registers can also occur as argument registers. Thus the passed input/output register structs for la_s390_[32|64]_gnu_plt[enter|exit] functions should reflect those new registers. This patch extends these structs La_s390_regs and La_s390_retval and adjusts _dl_runtime_profile() to handle those fields in case of running on a z13 machine. ChangeLog: * sysdeps/s390/bits/link.h: (La_s390_vr) New typedef. (La_s390_32_regs): Append vector register lr_v24-lr_v31. (La_s390_64_regs): Likewise. (La_s390_32_retval): Append vector register lrv_v24. (La_s390_64_retval): Likeweise. * sysdeps/s390/s390-32/dl-trampoline.h (_dl_runtime_profile): Handle extended structs La_s390_32_regs and La_s390_32_retval. * sysdeps/s390/s390-64/dl-trampoline.h (_dl_runtime_profile): Handle extended structs La_s390_64_regs and La_s390_64_retval.
232 lines
6.8 KiB
C
232 lines
6.8 KiB
C
/* PLT trampolines. s390 version.
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Copyright (C) 2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* This code is used in dl-runtime.c to call the `fixup' function
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and then redirect to the address it returns. */
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/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
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* with the following linkage:
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* r2 - r6 : parameter registers
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* f0, f2 : floating point parameter registers
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* v24, v26, v28, v30, v25, v27, v29, v31 : vector parameter registers
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* 24(r15), 28(r15) : PLT arguments PLT1, PLT2
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* 96(r15) : additional stack parameters
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* The normal clobber rules for function calls apply:
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* r0 - r5 : call clobbered
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* r6 - r13 : call saved
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* r14 : return address (call clobbered)
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* r15 : stack pointer (call saved)
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* f4, f6 : call saved
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* f0 - f3, f5, f7 - f15 : call clobbered
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* v0 - v3, v5, v7 - v15 : bytes 0-7 overlap with fprs: call clobbered
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bytes 8-15: call clobbered
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* v4, v6 : bytes 0-7 overlap with f4, f6: call saved
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bytes 8-15: call clobbered
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* v16 - v31 : call clobbered
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*/
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.globl _dl_runtime_resolve
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.type _dl_runtime_resolve, @function
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cfi_startproc
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.align 16
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_dl_runtime_resolve:
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stm %r2,%r5,32(%r15) # save registers
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cfi_offset (r2, -64)
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cfi_offset (r3, -60)
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cfi_offset (r4, -56)
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cfi_offset (r5, -52)
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std %f0,56(%r15)
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cfi_offset (f0, -40)
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std %f2,64(%r15)
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cfi_offset (f2, -32)
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st %r14,8(%r15)
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cfi_offset (r14, -88)
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lr %r0,%r15
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lm %r2,%r3,24(%r15) # load args saved by PLT
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#ifdef RESTORE_VRS
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ahi %r15,-224 # create stack frame
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cfi_adjust_cfa_offset (224)
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.machine push
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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vstm %v24,%v31,96(%r15) # store call-clobbered vr arguments
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cfi_offset (v24, -224)
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cfi_offset (v25, -208)
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cfi_offset (v26, -192)
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cfi_offset (v27, -176)
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cfi_offset (v28, -160)
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cfi_offset (v29, -144)
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cfi_offset (v30, -128)
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cfi_offset (v31, -112)
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.machine pop
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#else
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ahi %r15,-96 # create stack frame
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cfi_adjust_cfa_offset (96)
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#endif
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st %r0,0(%r15) # write backchain
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basr %r1,0
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0: l %r14,1f-0b(%r1)
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bas %r14,0(%r14,%r1) # call _dl_fixup
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lr %r1,%r2 # function addr returned in r2
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#ifdef RESTORE_VRS
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.machine push
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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vlm %v24,%v31,96(%r15) # restore vector registers
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.machine pop
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aghi %r15,224 # remove stack frame
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cfi_adjust_cfa_offset (-224)
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#else
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ahi %r15,96 # remove stack frame
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cfi_adjust_cfa_offset (-96)
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#endif
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l %r14,8(15) # restore registers
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ld %f0,56(%r15)
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ld %f2,64(%r15)
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lm %r2,%r5,32(%r15)
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br %r1
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1: .long _dl_fixup - 0b
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cfi_endproc
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.size _dl_runtime_resolve, .-_dl_runtime_resolve
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#ifndef PROF
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.globl _dl_runtime_profile
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.type _dl_runtime_profile, @function
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cfi_startproc
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.align 16
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_dl_runtime_profile:
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st %r12,12(%r15) # r12 is used as backup of r15
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cfi_offset (r12, -84)
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st %r14,16(%r15)
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cfi_offset (r14, -80)
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lr %r12,%r15 # backup stack pointer
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cfi_def_cfa_register (12)
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ahi %r15,-264 # create stack frame:
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# 96 + sizeof(La_s390_32_regs)
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st %r12,0(%r15) # save backchain
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stm %r2,%r6,96(%r15) # save registers
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cfi_offset (r2, -264) # + r6 needed as arg for
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cfi_offset (r3, -260) # _dl_profile_fixup
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cfi_offset (r4, -256)
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cfi_offset (r5, -252)
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cfi_offset (r6, -248)
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std %f0,120(%r15)
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cfi_offset (f0, -240)
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std %f2,128(%r15)
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cfi_offset (f2, -232)
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#ifdef RESTORE_VRS
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.machine push
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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vstm %v24,%v31,136(%r15) # store call-clobbered vr arguments
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cfi_offset (v24, -224)
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cfi_offset (v25, -208)
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cfi_offset (v26, -192)
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cfi_offset (v27, -176)
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cfi_offset (v28, -160)
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cfi_offset (v29, -144)
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cfi_offset (v30, -128)
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cfi_offset (v31, -112)
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.machine pop
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#endif
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lm %r2,%r3,24(%r12) # load arguments saved by PLT
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lr %r4,%r14 # return address as third parameter
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basr %r1,0
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0: l %r14,6f-0b(%r1)
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la %r5,96(%r15) # pointer to struct La_s390_32_regs
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la %r6,20(%r12) # long int * framesize
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bas %r14,0(%r14,%r1) # call resolver
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lr %r1,%r2 # function addr returned in r2
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ld %f0,120(%r15) # restore call-clobbered arg fprs
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ld %f2,128(%r15)
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#ifdef RESTORE_VRS
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.machine push
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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vlm %v24,%v31,136(%r15) # restore call-clobbered arg vrs
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.machine pop
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#endif
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icm %r0,15,20(%r12) # load & test framesize
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jnm 2f
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lm %r2,%r6,96(%r15) # framesize < 0 means no pltexit call
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# so we can do a tail call without
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# copying the arg overflow area
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lr %r15,%r12 # remove stack frame
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cfi_def_cfa_register (15)
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l %r14,16(%r15) # restore registers
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l %r12,12(%r15)
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br %r1 # tail-call to the resolved function
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cfi_def_cfa_register (12)
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2: la %r4,96(%r15) # pointer to struct La_s390_32_regs
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st %r4,32(%r12)
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jz 4f # framesize == 0 ?
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ahi %r0,7 # align framesize to 8
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lhi %r2,-8
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nr %r0,%r2
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slr %r15,%r0 # make room for framesize bytes
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st %r12,0(%r15) # save backchain
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la %r2,96(%r15)
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la %r3,96(%r12)
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srl %r0,3
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3: mvc 0(8,%r2),0(%r3) # copy additional parameters
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la %r2,8(%r2)
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la %r3,8(%r3)
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brct %r0,3b
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4: lm %r2,%r6,0(%r4) # load register parameters
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basr %r14,%r1 # call resolved function
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stm %r2,%r3,40(%r12) # store return values r2, r3, f0
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std %f0,48(%r12) # to struct La_s390_32_retval
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#ifdef RESTORE_VRS
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.machine push
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.machine "z13"
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vst %v24,56(%r12) # store return value v24
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.machine pop
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#endif
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lm %r2,%r4,24(%r12) # r2, r3: load arguments saved by PLT
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# r4: pointer to struct La_s390_32_regs
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basr %r1,0
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5: l %r14,7f-5b(%r1)
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la %r5,40(%r12) # pointer to struct La_s390_32_retval
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bas %r14,0(%r14,%r1) # call _dl_call_pltexit
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lr %r15,%r12 # remove stack frame
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cfi_def_cfa_register (15)
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l %r14,16(%r15) # restore registers
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l %r12,12(%r15)
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lm %r2,%r3,40(%r15) # restore return values
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ld %f0,48(%r15)
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#ifdef RESTORE_VRS
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.machine push
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.machine "z13"
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vl %v24,56(%r15) # restore return value v24
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.machine pop
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#endif
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br %r14
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6: .long _dl_profile_fixup - 0b
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7: .long _dl_call_pltexit - 5b
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cfi_endproc
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.size _dl_runtime_profile, .-_dl_runtime_profile
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#endif
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