/* $NetBSD: start.S,v 1.4 2023/06/05 18:16:07 martin Exp $ */ /*- * Copyright (c) 2001 Doug Rabson * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/sys/boot/efi/libefi/arch/ia64/start.S,v 1.7 2004/07/20 07:11:14 marcel Exp $ */ .text #include <machine/asm.h> #define EFI_SUCCESS 0 #define EFI_LOAD_ERROR 1 #define EFI_BUFFER_TOO_SMALL 5 #define DT_NULL 0 /* Terminating entry. */ #define DT_NEEDED 1 /* String table offset of a needed shared library. */ #define DT_PLTRELSZ 2 /* Total size in bytes of PLT relocations. */ #define DT_PLTGOT 3 /* Processor-dependent address. */ #define DT_HASH 4 /* Address of symbol hash table. */ #define DT_STRTAB 5 /* Address of string table. */ #define DT_SYMTAB 6 /* Address of symbol table. */ #define DT_RELA 7 /* Address of ElfNN_Rela relocations. */ #define DT_RELASZ 8 /* Total size of ElfNN_Rela relocations. */ #define DT_RELAENT 9 /* Size of each ElfNN_Rela relocation entry. */ #define DT_STRSZ 10 /* Size of string table. */ #define DT_SYMENT 11 /* Size of each symbol table entry. */ #define DT_INIT 12 /* Address of initialization function. */ #define DT_FINI 13 /* Address of finalization function. */ #define DT_SONAME 14 /* String table offset of shared object name. */ #define DT_RPATH 15 /* String table offset of library path. */ #define DT_SYMBOLIC 16 /* Indicates "symbolic" linking. */ #define DT_REL 17 /* Address of ElfNN_Rel relocations. */ #define DT_RELSZ 18 /* Total size of ElfNN_Rel relocations. */ #define DT_RELENT 19 /* Size of each ElfNN_Rel relocation. */ #define DT_PLTREL 20 /* Type of relocation used for PLT. */ #define DT_DEBUG 21 /* Reserved (not used). */ #define DT_TEXTREL 22 /* Indicates there may be relocations in non-writable segments. */ #define DT_JMPREL 23 /* Address of PLT relocations. */ #define DT_COUNT 24 /* Number of defined d_tag values. */ #define R_IA64_NONE 0 /* None */ #define R_IA64_DIR64MSB 0x26 /* word64 MSB S + A */ #define R_IA64_DIR64LSB 0x27 /* word64 LSB S + A */ #define R_IA64_FPTR64MSB 0x46 /* word64 MSB @fptr(S + A) */ #define R_IA64_FPTR64LSB 0x47 /* word64 LSB @fptr(S + A) */ #define R_IA64_REL64MSB 0x6e /* word64 MSB BD + A */ #define R_IA64_REL32LSB 0x6d /* word32 LSB BD + A */ #define R_IA64_REL64LSB 0x6f /* word64 LSB BD + A */ #define R_IA64_IPLTLSB 0x81 /* function descriptor LSB special */ ENTRY(_start, 2) alloc loc0=ar.pfs,2,3,3,0 mov loc1=rp movl loc2=@gprel(ImageBase) ;; add loc2=gp,loc2 ;; mov out0=loc2 mov out1=in1 ;; br.call.sptk.few rp=_reloc // relocate image cmp.ne p6,p0=EFI_SUCCESS,r8 // did it work? (p6) br.cond.dpnt.few 9f mov out0=in0 // image_handle mov out1=in1 // system_table br.call.sptk.few rp=efi_main 9: mov ar.pfs=loc0 mov rp=loc1 ;; br.ret.sptk.few rp END(_start) // PLABEL for PE32+ .section .plabel, "a" .align 16 .global _start_plabel _start_plabel: data16 @iplt(_start) .previous // A PE32+ relocation entry for the plabel .section .reloc, "a" data4 _start_plabel data4 12 data2 (10 << 12) + 0 data2 (10 << 12) + 8 .previous // in0: image base // in1: system table // // XXX Assumes PLT relocations are of type Elf_Rela // // r2 = address of fptr_storage // r3 = address of fptr_storage_end // r4 = address of first free fptr // // r15 = r_offset // r16 = r_info -OR- d_tag // r17 = r_addend -OR- d_val (=d_ptr) // r18 = address of .rela dynamic section // r19 = size of .rela section // r20 = size of .rela element (Elf_Rela) // r21 = address of first PLT relocation // r22 = size of PLT relocations // r23 = relocation type // r24 = address of symbol // r28 = R_IA64_IPLTLSB // f8 = address of symbol table // f9 = size of symtab element STATIC_ENTRY(_reloc, 2) alloc loc0=ar.pfs,2,2,0,0 ;; mov loc1=rp movl r29=@gprel(_DYNAMIC) // find _DYNAMIC etc. ;; add r15=r29,gp movl r29=@gprel(fptr_storage) ;; add r2=r29,gp movl r29=@gprel(fptr_storage_end) ;; add r3=r29,gp mov r4=r2 mov r19=0 mov r22=0 mov r20=24 mov r28=R_IA64_IPLTLSB ;; 1: ld8 r16=[r15],8 // read r15->d_tag ;; ld8 r17=[r15],8 // and r15->d_val ;; cmp.eq p6,p0=DT_NULL,r16 // done? (p6) br.cond.dpnt.few 2f ;; cmp.eq p6,p0=DT_RELA,r16 // rela section? ;; (p6) add r18=r17,in0 cmp.eq p6,p0=DT_RELASZ,r16 // rela section size? ;; (p6) mov r19=r17 cmp.eq p6,p0=DT_RELAENT,r16 // rela entry size? ;; (p6) mov r20=r17 cmp.eq p6,p0=DT_JMPREL,r16 // PLT relocs? ;; (p6) add r21=r17,in0 cmp.eq p6,p0=DT_PLTRELSZ,r16 // PLT relocs size? ;; (p6) mov r22=r17 cmp.eq p6,p0=DT_SYMTAB,r16 // symbol table? ;; (p6) add r29=r17,in0 ;; (p6) setf.sig f8=r29 cmp.eq p6,p0=DT_SYMENT,r16 // symbol entry size? ;; (p6) setf.sig f9=r17 br.dptk 1b 2: cmp.lt p6,p0=0,r19 (p6) br.cond.dptk 3f ;; mov r19=r22 mov r18=r21 mov r21=0 mov r22=0 ;; cmp.lt p6,p0=0,r19 (p6) br.cond.dptk 3f ;; mov r8=EFI_SUCCESS br.dptk 9f 3: ld8 r29=[r18],8 // read r_offset ;; ld8 r16=[r18],8 // read r_info add r15=r29,in0 // relocate r_offset ;; ld8 r17=[r18],8 // read r_addend sub r19=r19,r20 // update relasz extr.u r23=r16,0,32 // ELF64_R_TYPE(r16) ;; cmp.eq p6,p0=R_IA64_NONE,r23 (p6) br.cond.dpnt.few 2b ;; cmp.eq p6,p0=R_IA64_REL32LSB,r23 (p6) br.cond.dptk.few 3f ;; cmp.eq p6,p0=R_IA64_REL64LSB,r23 (p6) br.cond.dptk.few 4f ;; extr.u r29=r16,32,32 // ELF64_R_SYM(r16) ;; setf.sig f10=r29 // so we can multiply ;; xma.lu f10=f10,f9,f8 // f10=symtab + r_sym*syment ;; getf.sig r29=f10 ;; add r29=8,r29 // address of st_value ;; ld8 r29=[r29] // read symbol value ;; add r24=r29,in0 // relocate symbol value ;; cmp.eq p6,p0=R_IA64_DIR64LSB,r23 (p6) br.cond.dptk.few 5f ;; cmp.eq p6,p0=R_IA64_FPTR64LSB,r23 (p6) br.cond.dptk.few 6f ;; cmp.ne p6,p0=r28,r23 // IPLTLSB (p6) br.cond.dptk.few 2b // IPLTLSB add r29=r24,r17 // S + A ;; st8 [r15]=r29,8 // fdesc:FP ;; st8 [r15]=gp // fdesc:GP br.cond.sptk.few 2b // REL32LSB 3: add r29=in0,r17 ;; st4 [r15]=r29 br.cond.sptk.few 2b // REL64LSB 4: add r29=in0,r17 // BD + A ;; st8 [r15]=r29 // word64 br.cond.sptk.few 2b // DIR64LSB 5: add r29=r24,r17 // S + A ;; st8 [r15]=r29 // word64 br.cond.sptk.few 2b 6: mov r29=r2 // FPTR64LSB ;; 7: cmp.geu p6,p0=r29,r4 // end of fptrs? (p6) br.cond.dpnt.few 8f // can't find existing fptr ld8 r17=[r29] // read function from fptr ;; cmp.eq p6,p0=r24,r17 // same function? ;; (p6) st8 [r15]=r29 // reuse fptr (p6) br.cond.sptk.few 2b // done add r29=16,r29 // next fptr br.sptk.few 7b 8: mov r8=EFI_BUFFER_TOO_SMALL // failure return value cmp.geu p6,p0=r4,r3 // space left? (p6) br.cond.dpnt.few 9f // bail out st8 [r15]=r4 // install fptr ;; st8 [r4]=r24,8 // write fptr address ;; st8 [r4]=gp,8 // write fptr gp br.cond.sptk.few 2b 9: mov ar.pfs=loc0 mov rp=loc1 ;; br.ret.sptk.few rp END(_reloc) .data .align 16 fptr_storage: .space 1024*16 // XXX fptr_storage_end:
