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dee943668f
In _dl_runtime_resolve[_vx], unwinding fails after the new stack frame is created as there is no CFI rule for r15. This is also observeable in GDB: Backtrace stopped: previous frame inner to this frame (corrupt stack?) Therefore this patch is now storing r15 on stack and is using cfi_offset rule. The stmg/lmg instruction is used to store/load r14 and r15 with one instruction. On 64bit, the offsets of the fprs have moved to store r15 directly after r14. On 31bit, the r14/r15 is now stored between the other gprs and fprs as the space wasn't used. ChangeLog: * sysdeps/s390/s390-64/dl-trampoline.h (_dl_runtime_resolve): Store r15 on stack and add cfi rule. * sysdeps/s390/s390-32/dl-trampoline.h (_dl_runtime_resolve): Likewise.
225 lines
6.8 KiB
C
225 lines
6.8 KiB
C
/* PLT trampolines. s390x version.
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Copyright (C) 2016-2017 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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/* 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, f4, f6 : floating point parameter registers
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* v24, v26, v28, v30, v25, v27, v29, v31 : vector parameter registers
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* 48(r15), 56(r15) : PLT arguments PLT1, PLT2
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* 160(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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* f0 - f7 : call clobbered
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* f8 - f15 : call saved
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* v0 - v7 : bytes 0-7 overlap with f0-f7: call clobbered
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bytes 8-15: call clobbered
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* v8 - v15 : bytes 0-7 overlap with f8-f15: 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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stmg %r2,%r5,64(%r15) # save call-clobbered argument registers
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cfi_offset (r2, -96)
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cfi_offset (r3, -88)
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cfi_offset (r4, -80)
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cfi_offset (r5, -72)
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stmg %r14,%r15,96(%r15)
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cfi_offset (r14, -64)
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cfi_offset (r15, -56)
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std %f0,112(%r15)
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cfi_offset (f0, -48)
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std %f2,120(%r15)
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cfi_offset (f2, -40)
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std %f4,128(%r15)
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cfi_offset (f4, -32)
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std %f6,136(%r15)
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cfi_offset (f6, -24)
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lmg %r2,%r3,48(%r15) # load args for fixup saved by PLT
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lgr %r0,%r15
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#ifdef RESTORE_VRS
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aghi %r15,-288 # create stack frame
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cfi_adjust_cfa_offset (288)
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.machine push
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.machine "z13"
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vstm %v24,%v31,160(%r15)# store call-clobbered vector argument registers
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cfi_offset (v24, -288)
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cfi_offset (v25, -272)
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cfi_offset (v26, -256)
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cfi_offset (v27, -240)
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cfi_offset (v28, -224)
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cfi_offset (v29, -208)
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cfi_offset (v30, -192)
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cfi_offset (v31, -176)
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.machine pop
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#else
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aghi %r15,-160 # create stack frame
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cfi_adjust_cfa_offset (160)
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#endif
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stg %r0,0(%r15) # write backchain
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brasl %r14,_dl_fixup # call _dl_fixup
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lgr %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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vlm %v24,%v31,160(%r15)# restore vector registers
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.machine pop
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lmg %r14,%r15,384(%r15)# remove stack frame and restore registers
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#else
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lmg %r14,%r15,256(%r15)# remove stack frame and restore registers
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#endif
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cfi_def_cfa_offset (160)
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ld %f0,112(%r15)
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ld %f2,120(%r15)
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ld %f4,128(%r15)
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ld %f6,136(%r15)
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lmg %r2,%r5,64(%r15)
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br %r1
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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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stg %r12,24(%r15) # r12 is used as backup of r15
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cfi_offset (r12, -136)
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stg %r14,32(%r15)
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cfi_offset (r14, -128)
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lgr %r12,%r15 # backup stack pointer
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cfi_def_cfa_register (12)
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aghi %r15,-360 # create stack frame:
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# 160 + sizeof(La_s390_64_regs)
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stg %r12,0(%r15) # save backchain
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stmg %r2,%r6,160(%r15) # save call-clobbered arg regs
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cfi_offset (r2, -360) # + r6 needed as arg for
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cfi_offset (r3, -352) # _dl_profile_fixup
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cfi_offset (r4, -344)
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cfi_offset (r5, -336)
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cfi_offset (r6, -328)
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std %f0,200(%r15)
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cfi_offset (f0, -320)
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std %f2,208(%r15)
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cfi_offset (f2, -312)
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std %f4,216(%r15)
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cfi_offset (f4, -304)
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std %f6,224(%r15)
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cfi_offset (f6, -296)
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#ifdef RESTORE_VRS
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.machine push
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.machine "z13"
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vstm %v24,%v31,232(%r15) # store call-clobbered vector arguments
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cfi_offset (v24, -288)
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cfi_offset (v25, -272)
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cfi_offset (v26, -256)
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cfi_offset (v27, -240)
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cfi_offset (v28, -224)
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cfi_offset (v29, -208)
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cfi_offset (v30, -192)
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cfi_offset (v31, -176)
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.machine pop
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#endif
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lmg %r2,%r3,48(%r12) # load arguments saved by PLT
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lgr %r4,%r14 # return address as third parameter
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la %r5,160(%r15) # pointer to struct La_s390_64_regs
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la %r6,40(%r12) # long int * framesize
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brasl %r14,_dl_profile_fixup # call resolver
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lgr %r1,%r2 # function addr returned in r2
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ld %f0,200(%r15) # restore call-clobbered arg fprs
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ld %f2,208(%r15)
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ld %f4,216(%r15)
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ld %f6,224(%r15)
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#ifdef RESTORE_VRS
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.machine push
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.machine "z13"
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vlm %v24,%v31,232(%r15) # restore call-clobbered arg vrs
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.machine pop
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#endif
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lg %r0,40(%r12) # load framesize
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ltgr %r0,%r0
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jnm 1f
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lmg %r2,%r6,160(%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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lgr %r15,%r12 # remove stack frame
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cfi_def_cfa_register (15)
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lg %r14,32(%r15) # restore registers
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lg %r12,24(%r15)
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br %r1 # tail-call to resolved function
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cfi_def_cfa_register (12)
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1: la %r4,160(%r15) # pointer to struct La_s390_64_regs
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stg %r4,64(%r12)
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jz 4f # framesize == 0 ?
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aghi %r0,7 # align framesize to 8
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nill %r0,0xfff8
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slgr %r15,%r0 # make room for framesize bytes
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stg %r12,0(%r15) # save backchain
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la %r2,160(%r15)
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la %r3,160(%r12)
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srlg %r0,%r0,3
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3: mvc 0(8,%r2),0(%r3) # copy additional parameters
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la %r2,8(%r2) # depending on framesize
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la %r3,8(%r3)
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brctg %r0,3b
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4: lmg %r2,%r6,0(%r4) # restore call-clobbered arg gprs
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basr %r14,%r1 # call resolved function
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stg %r2,72(%r12) # store return values r2, f0
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std %f0,80(%r12) # to struct La_s390_64_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 %v24,88(%r12) # store return value v24
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.machine pop
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#endif
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lmg %r2,%r4,48(%r12) # r2, r3: load arguments saved by PLT
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# r4: pointer to struct La_s390_64_regs
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la %r5,72(%r12) # pointer to struct La_s390_64_retval
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brasl %r14,_dl_call_pltexit
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lgr %r15,%r12 # remove stack frame
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cfi_def_cfa_register (15)
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lg %r14,32(%r15) # restore registers
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lg %r12,24(%r15)
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lg %r2,72(%r15) # restore return values
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ld %f0,80(%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 %v24,88(%r15) # restore return value v24
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.machine pop
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#endif
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br %r14 # Jump back to caller
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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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