337 lines
9.7 KiB
C
337 lines
9.7 KiB
C
/* PLT trampolines. s390 version.
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Copyright (C) 2016-2022 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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<https://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 slightly tightened normal clobber rules for function calls apply:
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* r0 : call saved (for __fentry__)
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* r1 - 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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#define CFA_OFF 96
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#define FRAME_OFF CFA_OFF + FRAME_SIZE
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#define V24_OFF -224
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#define V25_OFF -208
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#define V26_OFF -192
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#define V27_OFF -176
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#define V28_OFF -160
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#define V29_OFF -144
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#define V30_OFF -128
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#define V31_OFF -112
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#define R0_OFF -76
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#define PLT1_OFF -72
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#define PLT2_OFF -68
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#define R2_OFF -64
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#define R3_OFF -60
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#define R4_OFF -56
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#define R5_OFF -52
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#define R14_OFF -48
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#define R15_OFF -44
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#define F0_OFF -40
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#define F2_OFF -32
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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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st %r0,CFA_OFF+R0_OFF(%r15)
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cfi_offset (r0, R0_OFF)
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stm %r2,%r5,CFA_OFF+R2_OFF(%r15) # save registers
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cfi_offset (r2, R2_OFF)
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cfi_offset (r3, R3_OFF)
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cfi_offset (r4, R4_OFF)
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cfi_offset (r5, R5_OFF)
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stm %r14,%r15,CFA_OFF+R14_OFF(%r15)
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cfi_offset (r14, R14_OFF)
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cfi_offset (r15, R15_OFF)
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std %f0,CFA_OFF+F0_OFF(%r15)
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cfi_offset (f0, F0_OFF)
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std %f2,CFA_OFF+F2_OFF(%r15)
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cfi_offset (f2, F2_OFF)
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lr %r0,%r15
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lm %r2,%r3,CFA_OFF+PLT1_OFF(%r15) # load args saved by PLT
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#ifdef RESTORE_VRS
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# define FRAME_SIZE (CFA_OFF + 128)
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ahi %r15,-FRAME_SIZE # create stack frame
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cfi_adjust_cfa_offset (FRAME_SIZE)
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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,FRAME_OFF+V24_OFF(%r15) # save call-clobbered vr args
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cfi_offset (v24, V24_OFF)
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cfi_offset (v25, V25_OFF)
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cfi_offset (v26, V26_OFF)
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cfi_offset (v27, V27_OFF)
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cfi_offset (v28, V28_OFF)
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cfi_offset (v29, V29_OFF)
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cfi_offset (v30, V30_OFF)
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cfi_offset (v31, V31_OFF)
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.machine pop
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#else
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# define FRAME_SIZE CFA_OFF
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ahi %r15,-FRAME_SIZE # create stack frame
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cfi_adjust_cfa_offset (FRAME_SIZE)
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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,FRAME_OFF+V24_OFF(%r15) # restore vector registers
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.machine pop
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#endif
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lm %r14,%r15,FRAME_OFF+R14_OFF(%r15) # restore frame and registers
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#undef FRAME_SIZE
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cfi_def_cfa_offset (CFA_OFF)
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ld %f0,CFA_OFF+F0_OFF(%r15)
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ld %f2,CFA_OFF+F2_OFF(%r15)
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lm %r2,%r5,CFA_OFF+R2_OFF(%r15)
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l %r0,CFA_OFF+R0_OFF(%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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#undef V24_OFF
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#undef V25_OFF
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#undef V26_OFF
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#undef V27_OFF
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#undef V28_OFF
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#undef V29_OFF
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#undef V30_OFF
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#undef V31_OFF
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#undef R0_OFF
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#undef PLT1_OFF
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#undef PLT2_OFF
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#undef R2_OFF
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#undef R3_OFF
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#undef R4_OFF
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#undef R5_OFF
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#undef R14_OFF
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#undef R15_OFF
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#undef F0_OFF
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#undef F2_OFF
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#ifndef PROF
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# define SIZEOF_STRUCT_LA_S390_32_REGS 168
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# define REGS_OFF -264
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# define R2_OFF -264
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# define R3_OFF -260
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# define R4_OFF -256
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# define R5_OFF -252
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# define R6_OFF -248
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# define F0_OFF -240
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# define F2_OFF -232
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# define V24_OFF -224
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# define V25_OFF -208
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# define V26_OFF -192
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# define V27_OFF -176
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# define V28_OFF -160
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# define V29_OFF -144
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# define V30_OFF -128
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# define V31_OFF -112
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# define R0_OFF -88
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# define R12_OFF -84
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# define R14_OFF -80
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# define FRAMESIZE_OFF -76
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# define PLT1_OFF -72
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# define PLT2_OFF -68
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# define PREGS_OFF -64
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# define RETVAL_OFF -56
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# define RET_R2_OFF -56
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# define RET_R3_OFF -52
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# define RET_F0_OFF -48
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# define RET_V24_OFF -40
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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 %r0,CFA_OFF+R0_OFF(%r15)
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cfi_offset (r0, R0_OFF)
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st %r12,CFA_OFF+R12_OFF(%r15) # r12 is used as backup of r15
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cfi_offset (r12, R12_OFF)
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st %r14,CFA_OFF+R14_OFF(%r15)
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cfi_offset (r14, R14_OFF)
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lr %r12,%r15 # backup stack pointer
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cfi_def_cfa_register (12)
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# define FRAME_SIZE (CFA_OFF + SIZEOF_STRUCT_LA_S390_32_REGS)
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ahi %r15,-FRAME_SIZE # create stack frame:
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st %r12,0(%r15) # save backchain
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stm %r2,%r6,FRAME_OFF+R2_OFF(%r15) # save registers
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cfi_offset (r2, R2_OFF) # + r6 needed as arg for
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cfi_offset (r3, R3_OFF) # _dl_profile_fixup
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cfi_offset (r4, R4_OFF)
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cfi_offset (r5, R5_OFF)
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cfi_offset (r6, R6_OFF)
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std %f0,FRAME_OFF+F0_OFF(%r15)
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cfi_offset (f0, F0_OFF)
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std %f2,FRAME_OFF+F2_OFF(%r15)
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cfi_offset (f2, F2_OFF)
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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,FRAME_OFF+V24_OFF(%r15) # store call-clobbered
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cfi_offset (v24, V24_OFF) # vr arguments
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cfi_offset (v25, V25_OFF)
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cfi_offset (v26, V26_OFF)
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cfi_offset (v27, V27_OFF)
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cfi_offset (v28, V28_OFF)
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cfi_offset (v29, V29_OFF)
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cfi_offset (v30, V30_OFF)
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cfi_offset (v31, V31_OFF)
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.machine pop
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# endif
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lm %r2,%r3,CFA_OFF+PLT1_OFF(%r12) # load arguments saved by PLT
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lr %r4,%r14 # return address as third parm
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basr %r1,0
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0: l %r14,6f-0b(%r1)
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la %r5,FRAME_OFF+REGS_OFF(%r15) # struct La_s390_32_regs *
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la %r6,CFA_OFF+FRAMESIZE_OFF(%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,FRAME_OFF+F0_OFF(%r15) # restore call-clobbered
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ld %f2,FRAME_OFF+F2_OFF(%r15) # arg fprs
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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" # restore call-clobbered
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vlm %v24,%v31,FRAME_OFF+V24_OFF(%r15)# arg vrs
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.machine pop
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# endif
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icm %r0,15,CFA_OFF+FRAMESIZE_OFF(%r12) # load & test framesize
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jnm 2f
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# framesize < 0 means no
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lm %r2,%r6,FRAME_OFF+R2_OFF(%r15) # pltexit call, so we can do a
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# 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,CFA_OFF+R14_OFF(%r15) # restore registers
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l %r12,CFA_OFF+R12_OFF(%r15)
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l %r0,CFA_OFF+R0_OFF(%r15)
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br %r1 # tail call
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cfi_def_cfa_register (12)
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2: la %r4,FRAME_OFF+REGS_OFF(%r15) # struct La_s390_32_regs *
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st %r4,CFA_OFF+PREGS_OFF(%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,FRAME_OFF+REGS_OFF(%r15)
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la %r3,CFA_OFF(%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,CFA_OFF+RET_R2_OFF(%r12) # store return vals r2, r3, f0
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std %f0,CFA_OFF+RET_F0_OFF(%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,CFA_OFF+RET_V24_OFF(%r12) # store return value v24
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.machine pop
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# endif
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lm %r2,%r4,CFA_OFF+PLT1_OFF(%r12) # r2, r3: args saved by PLT
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# r4: 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,CFA_OFF+RETVAL_OFF(%r12) # struct La_s390_32_retval *
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bas %r14,0(%r14,%r1) # call _dl_audit_pltexit
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lr %r15,%r12 # remove stack frame
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# undef FRAME_SIZE
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cfi_def_cfa_register (15)
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l %r14,CFA_OFF+R14_OFF(%r15) # restore registers
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l %r12,CFA_OFF+R12_OFF(%r15)
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l %r0,CFA_OFF+R0_OFF(%r15)
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lm %r2,%r3,CFA_OFF+RET_R2_OFF(%r15) # restore return values
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ld %f0,CFA_OFF+RET_F0_OFF(%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,CFA_OFF+RET_V24_OFF(%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_audit_pltexit - 5b
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cfi_endproc
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.size _dl_runtime_profile, .-_dl_runtime_profile
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# undef SIZEOF_STRUCT_LA_S390_32_REGS
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# undef REGS_OFF
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# undef R2_OFF
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# undef R3_OFF
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# undef R4_OFF
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# undef R5_OFF
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# undef R6_OFF
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# undef F0_OFF
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# undef F2_OFF
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# undef V24_OFF
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# undef V25_OFF
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# undef V26_OFF
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# undef V27_OFF
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# undef V28_OFF
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# undef V29_OFF
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# undef V30_OFF
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# undef V31_OFF
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# undef R0_OFF
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# undef R12_OFF
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# undef R14_OFF
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# undef FRAMESIZE_OFF
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# undef PLT1_OFF
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# undef PLT2_OFF
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# undef PREGS_OFF
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# undef RETVAL_OFF
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# undef RET_R2_OFF
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# undef RET_R3_OFF
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# undef RET_F0_OFF
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# undef RET_V24_OFF
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#endif
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