/* PLT trampolines. s390 version. Copyright (C) 2016-2021 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, see . */ /* 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 * v24, v26, v28, v30, v25, v27, v29, v31 : vector parameter registers * 24(r15), 28(r15) : PLT arguments PLT1, PLT2 * 96(r15) : additional stack parameters * The slightly tightened normal clobber rules for function calls apply: * r0 : call saved (for __fentry__) * r1 - 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 * v0 - v3, v5, v7 - v15 : bytes 0-7 overlap with fprs: call clobbered bytes 8-15: call clobbered * v4, v6 : bytes 0-7 overlap with f4, f6: call saved bytes 8-15: call clobbered * v16 - v31 : call clobbered */ #define CFA_OFF 96 #define FRAME_OFF CFA_OFF + FRAME_SIZE #define V24_OFF -224 #define V25_OFF -208 #define V26_OFF -192 #define V27_OFF -176 #define V28_OFF -160 #define V29_OFF -144 #define V30_OFF -128 #define V31_OFF -112 #define R0_OFF -76 #define PLT1_OFF -72 #define PLT2_OFF -68 #define R2_OFF -64 #define R3_OFF -60 #define R4_OFF -56 #define R5_OFF -52 #define R14_OFF -48 #define R15_OFF -44 #define F0_OFF -40 #define F2_OFF -32 .globl _dl_runtime_resolve .type _dl_runtime_resolve, @function cfi_startproc .align 16 _dl_runtime_resolve: st %r0,CFA_OFF+R0_OFF(%r15) cfi_offset (r0, R0_OFF) stm %r2,%r5,CFA_OFF+R2_OFF(%r15) # save registers cfi_offset (r2, R2_OFF) cfi_offset (r3, R3_OFF) cfi_offset (r4, R4_OFF) cfi_offset (r5, R5_OFF) stm %r14,%r15,CFA_OFF+R14_OFF(%r15) cfi_offset (r14, R14_OFF) cfi_offset (r15, R15_OFF) std %f0,CFA_OFF+F0_OFF(%r15) cfi_offset (f0, F0_OFF) std %f2,CFA_OFF+F2_OFF(%r15) cfi_offset (f2, F2_OFF) lr %r0,%r15 lm %r2,%r3,CFA_OFF+PLT1_OFF(%r15) # load args saved by PLT #ifdef RESTORE_VRS # define FRAME_SIZE (CFA_OFF + 128) ahi %r15,-FRAME_SIZE # create stack frame cfi_adjust_cfa_offset (FRAME_SIZE) .machine push .machine "z13" .machinemode "zarch_nohighgprs" vstm %v24,%v31,FRAME_OFF+V24_OFF(%r15) # save call-clobbered vr args cfi_offset (v24, V24_OFF) cfi_offset (v25, V25_OFF) cfi_offset (v26, V26_OFF) cfi_offset (v27, V27_OFF) cfi_offset (v28, V28_OFF) cfi_offset (v29, V29_OFF) cfi_offset (v30, V30_OFF) cfi_offset (v31, V31_OFF) .machine pop #else # define FRAME_SIZE CFA_OFF ahi %r15,-FRAME_SIZE # create stack frame cfi_adjust_cfa_offset (FRAME_SIZE) #endif st %r0,0(%r15) # write backchain basr %r1,0 0: l %r14,1f-0b(%r1) bas %r14,0(%r14,%r1) # call _dl_fixup lr %r1,%r2 # function addr returned in r2 #ifdef RESTORE_VRS .machine push .machine "z13" .machinemode "zarch_nohighgprs" vlm %v24,%v31,FRAME_OFF+V24_OFF(%r15) # restore vector registers .machine pop #endif lm %r14,%r15,FRAME_OFF+R14_OFF(%r15) # restore frame and registers #undef FRAME_SIZE cfi_def_cfa_offset (CFA_OFF) ld %f0,CFA_OFF+F0_OFF(%r15) ld %f2,CFA_OFF+F2_OFF(%r15) lm %r2,%r5,CFA_OFF+R2_OFF(%r15) l %r0,CFA_OFF+R0_OFF(%r15) br %r1 1: .long _dl_fixup - 0b cfi_endproc .size _dl_runtime_resolve, .-_dl_runtime_resolve #undef V24_OFF #undef V25_OFF #undef V26_OFF #undef V27_OFF #undef V28_OFF #undef V29_OFF #undef V30_OFF #undef V31_OFF #undef R0_OFF #undef PLT1_OFF #undef PLT2_OFF #undef R2_OFF #undef R3_OFF #undef R4_OFF #undef R5_OFF #undef R14_OFF #undef R15_OFF #undef F0_OFF #undef F2_OFF #ifndef PROF # define SIZEOF_STRUCT_LA_S390_32_REGS 168 # define REGS_OFF -264 # define R2_OFF -264 # define R3_OFF -260 # define R4_OFF -256 # define R5_OFF -252 # define R6_OFF -248 # define F0_OFF -240 # define F2_OFF -232 # define V24_OFF -224 # define V25_OFF -208 # define V26_OFF -192 # define V27_OFF -176 # define V28_OFF -160 # define V29_OFF -144 # define V30_OFF -128 # define V31_OFF -112 # define R0_OFF -88 # define R12_OFF -84 # define R14_OFF -80 # define FRAMESIZE_OFF -76 # define PLT1_OFF -72 # define PLT2_OFF -68 # define PREGS_OFF -64 # define RETVAL_OFF -56 # define RET_R2_OFF -56 # define RET_R3_OFF -52 # define RET_F0_OFF -48 # define RET_V24_OFF -40 .globl _dl_runtime_profile .type _dl_runtime_profile, @function cfi_startproc .align 16 _dl_runtime_profile: st %r0,CFA_OFF+R0_OFF(%r15) cfi_offset (r0, R0_OFF) st %r12,CFA_OFF+R12_OFF(%r15) # r12 is used as backup of r15 cfi_offset (r12, R12_OFF) st %r14,CFA_OFF+R14_OFF(%r15) cfi_offset (r14, R14_OFF) lr %r12,%r15 # backup stack pointer cfi_def_cfa_register (12) # define FRAME_SIZE (CFA_OFF + SIZEOF_STRUCT_LA_S390_32_REGS) ahi %r15,-FRAME_SIZE # create stack frame: st %r12,0(%r15) # save backchain stm %r2,%r6,FRAME_OFF+R2_OFF(%r15) # save registers cfi_offset (r2, R2_OFF) # + r6 needed as arg for cfi_offset (r3, R3_OFF) # _dl_profile_fixup cfi_offset (r4, R4_OFF) cfi_offset (r5, R5_OFF) cfi_offset (r6, R6_OFF) std %f0,FRAME_OFF+F0_OFF(%r15) cfi_offset (f0, F0_OFF) std %f2,FRAME_OFF+F2_OFF(%r15) cfi_offset (f2, F2_OFF) # ifdef RESTORE_VRS .machine push .machine "z13" .machinemode "zarch_nohighgprs" vstm %v24,%v31,FRAME_OFF+V24_OFF(%r15) # store call-clobbered cfi_offset (v24, V24_OFF) # vr arguments cfi_offset (v25, V25_OFF) cfi_offset (v26, V26_OFF) cfi_offset (v27, V27_OFF) cfi_offset (v28, V28_OFF) cfi_offset (v29, V29_OFF) cfi_offset (v30, V30_OFF) cfi_offset (v31, V31_OFF) .machine pop # endif lm %r2,%r3,CFA_OFF+PLT1_OFF(%r12) # load arguments saved by PLT lr %r4,%r14 # return address as third parm basr %r1,0 0: l %r14,6f-0b(%r1) la %r5,FRAME_OFF+REGS_OFF(%r15) # struct La_s390_32_regs * la %r6,CFA_OFF+FRAMESIZE_OFF(%r12) # long int * framesize bas %r14,0(%r14,%r1) # call resolver lr %r1,%r2 # function addr returned in r2 ld %f0,FRAME_OFF+F0_OFF(%r15) # restore call-clobbered ld %f2,FRAME_OFF+F2_OFF(%r15) # arg fprs # ifdef RESTORE_VRS .machine push .machine "z13" .machinemode "zarch_nohighgprs" # restore call-clobbered vlm %v24,%v31,FRAME_OFF+V24_OFF(%r15)# arg vrs .machine pop # endif icm %r0,15,CFA_OFF+FRAMESIZE_OFF(%r12) # load & test framesize jnm 2f # framesize < 0 means no lm %r2,%r6,FRAME_OFF+R2_OFF(%r15) # pltexit call, so we can do a # tail call without # copying the arg overflow area lr %r15,%r12 # remove stack frame cfi_def_cfa_register (15) l %r14,CFA_OFF+R14_OFF(%r15) # restore registers l %r12,CFA_OFF+R12_OFF(%r15) l %r0,CFA_OFF+R0_OFF(%r15) br %r1 # tail call cfi_def_cfa_register (12) 2: la %r4,FRAME_OFF+REGS_OFF(%r15) # struct La_s390_32_regs * st %r4,CFA_OFF+PREGS_OFF(%r12) 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) # save backchain la %r2,FRAME_OFF+REGS_OFF(%r15) la %r3,CFA_OFF(%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,%r6,0(%r4) # load register parameters basr %r14,%r1 # call resolved function stm %r2,%r3,CFA_OFF+RET_R2_OFF(%r12) # store return vals r2, r3, f0 std %f0,CFA_OFF+RET_F0_OFF(%r12) # to struct La_s390_32_retval # ifdef RESTORE_VRS .machine push .machine "z13" vst %v24,CFA_OFF+RET_V24_OFF(%r12) # store return value v24 .machine pop # endif lm %r2,%r4,CFA_OFF+PLT1_OFF(%r12) # r2, r3: args saved by PLT # r4: struct La_s390_32_regs * basr %r1,0 5: l %r14,7f-5b(%r1) la %r5,CFA_OFF+RETVAL_OFF(%r12) # struct La_s390_32_retval * bas %r14,0(%r14,%r1) # call _dl_audit_pltexit lr %r15,%r12 # remove stack frame # undef FRAME_SIZE cfi_def_cfa_register (15) l %r14,CFA_OFF+R14_OFF(%r15) # restore registers l %r12,CFA_OFF+R12_OFF(%r15) l %r0,CFA_OFF+R0_OFF(%r15) lm %r2,%r3,CFA_OFF+RET_R2_OFF(%r15) # restore return values ld %f0,CFA_OFF+RET_F0_OFF(%r15) # ifdef RESTORE_VRS .machine push .machine "z13" vl %v24,CFA_OFF+RET_V24_OFF(%r15) # restore return value v24 .machine pop # endif br %r14 6: .long _dl_profile_fixup - 0b 7: .long _dl_audit_pltexit - 5b cfi_endproc .size _dl_runtime_profile, .-_dl_runtime_profile # undef SIZEOF_STRUCT_LA_S390_32_REGS # undef REGS_OFF # undef R2_OFF # undef R3_OFF # undef R4_OFF # undef R5_OFF # undef R6_OFF # undef F0_OFF # undef F2_OFF # undef V24_OFF # undef V25_OFF # undef V26_OFF # undef V27_OFF # undef V28_OFF # undef V29_OFF # undef V30_OFF # undef V31_OFF # undef R0_OFF # undef R12_OFF # undef R14_OFF # undef FRAMESIZE_OFF # undef PLT1_OFF # undef PLT2_OFF # undef PREGS_OFF # undef RETVAL_OFF # undef RET_R2_OFF # undef RET_R3_OFF # undef RET_F0_OFF # undef RET_V24_OFF #endif