diff options
Diffstat (limited to 'gnu-efi/gnu-efi-3.0/gnuefi/reloc_ia64.S')
| -rw-r--r-- | gnu-efi/gnu-efi-3.0/gnuefi/reloc_ia64.S | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/gnu-efi/gnu-efi-3.0/gnuefi/reloc_ia64.S b/gnu-efi/gnu-efi-3.0/gnuefi/reloc_ia64.S new file mode 100644 index 0000000..40203bf --- /dev/null +++ b/gnu-efi/gnu-efi-3.0/gnuefi/reloc_ia64.S @@ -0,0 +1,227 @@ +/* reloc_ia64.S - position independent IA-64 ELF shared object relocator + Copyright (C) 1999 Hewlett-Packard Co. + Contributed by David Mosberger <davidm@hpl.hp.com>. + + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * 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. + * Neither the name of Hewlett-Packard Co. nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER OR CONTRIBUTORS + BE LIABLE FOR ANYDIRECT, 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. +*/ + +/* + * This is written in assembly because the entire code needs to be position + * independent. Note that the compiler does not generate code that's position + * independent by itself because it relies on the global offset table being + * relocated. + */ + .text + .psr abi64 + .psr lsb + .lsb + +/* + * This constant determines how many R_IA64_FPTR64LSB relocations we + * can deal with. If you get EFI_BUFFER_TOO_SMALL errors, you may + * need to increase this number. + */ +#define MAX_FUNCTION_DESCRIPTORS 750 + +#define ST_VALUE_OFF 8 /* offset of st_value in elf sym */ + +#define EFI_SUCCESS 0 +#define EFI_LOAD_ERROR 1 +#define EFI_BUFFER_TOO_SMALL 5 + +#define DT_NULL 0 /* Marks end of dynamic section */ +#define DT_RELA 7 /* Address of Rela relocs */ +#define DT_RELASZ 8 /* Total size of Rela relocs */ +#define DT_RELAENT 9 /* Size of one Rela reloc */ +#define DT_SYMTAB 6 /* Address of symbol table */ +#define DT_SYMENT 11 /* Size of one symbol table entry */ + +#define R_IA64_NONE 0 +#define R_IA64_REL64MSB 0x6e +#define R_IA64_REL64LSB 0x6f +#define R_IA64_DIR64MSB 0x26 +#define R_IA64_DIR64LSB 0x27 +#define R_IA64_FPTR64MSB 0x46 +#define R_IA64_FPTR64LSB 0x47 + +#define ldbase in0 /* load address (address of .text) */ +#define dyn in1 /* address of _DYNAMIC */ + +#define d_tag r16 +#define d_val r17 +#define rela r18 +#define relasz r19 +#define relaent r20 +#define addr r21 +#define r_info r22 +#define r_offset r23 +#define r_addend r24 +#define r_type r25 +#define r_sym r25 /* alias of r_type ! */ +#define fptr r26 +#define fptr_limit r27 +#define symtab f8 +#define syment f9 +#define ftmp f10 + +#define target r16 +#define val r17 + +#define NLOC 0 + +#define Pnull p6 +#define Prela p7 +#define Prelasz p8 +#define Prelaent p9 +#define Psymtab p10 +#define Psyment p11 + +#define Pnone p6 +#define Prel p7 +#define Pfptr p8 + +#define Pmore p6 + +#define Poom p6 /* out-of-memory */ + + .global _relocate + .proc _relocate +_relocate: + alloc r2=ar.pfs,2,0,0,0 + movl fptr = @gprel(fptr_mem_base) + ;; + add fptr = fptr, gp + movl fptr_limit = @gprel(fptr_mem_limit) + ;; + add fptr_limit = fptr_limit, gp + +search_dynamic: + ld8 d_tag = [dyn],8 + ;; + ld8 d_val = [dyn],8 + cmp.eq Pnull,p0 = DT_NULL,d_tag +(Pnull) br.cond.sptk.few apply_relocs + cmp.eq Prela,p0 = DT_RELA,d_tag + cmp.eq Prelasz,p0 = DT_RELASZ,d_tag + cmp.eq Psymtab,p0 = DT_SYMTAB,d_tag + cmp.eq Psyment,p0 = DT_SYMENT,d_tag + cmp.eq Prelaent,p0 = DT_RELAENT,d_tag + ;; +(Prela) add rela = d_val, ldbase +(Prelasz) mov relasz = d_val +(Prelaent) mov relaent = d_val +(Psymtab) add val = d_val, ldbase + ;; +(Psyment) setf.sig syment = d_val + ;; +(Psymtab) setf.sig symtab = val + br.sptk.few search_dynamic + +apply_loop: + ld8 r_offset = [rela] + add addr = 8,rela + sub relasz = relasz,relaent + ;; + + ld8 r_info = [addr],8 + ;; + ld8 r_addend = [addr] + add target = ldbase, r_offset + + add rela = rela,relaent + extr.u r_type = r_info, 0, 32 + ;; + cmp.eq Pnone,p0 = R_IA64_NONE,r_type + cmp.eq Prel,p0 = R_IA64_REL64LSB,r_type + cmp.eq Pfptr,p0 = R_IA64_FPTR64LSB,r_type +(Prel) br.cond.sptk.few apply_REL64 + ;; + cmp.eq Prel,p0 = R_IA64_DIR64LSB,r_type // treat DIR64 just like REL64 + +(Pnone) br.cond.sptk.few apply_relocs +(Prel) br.cond.sptk.few apply_REL64 +(Pfptr) br.cond.sptk.few apply_FPTR64 + + mov r8 = EFI_LOAD_ERROR + br.ret.sptk.few rp + +apply_relocs: + cmp.ltu Pmore,p0=0,relasz +(Pmore) br.cond.sptk.few apply_loop + + mov r8 = EFI_SUCCESS + br.ret.sptk.few rp + +apply_REL64: + ld8 val = [target] + ;; + add val = val,ldbase + ;; + st8 [target] = val + br.cond.sptk.few apply_relocs + + // FPTR relocs are a bit more interesting: we need to lookup + // the symbol's value in symtab, allocate 16 bytes of memory, + // store the value in [target] in the first and the gp in the + // second dword. +apply_FPTR64: + st8 [target] = fptr + extr.u r_sym = r_info,32,32 + add target = 8,fptr + ;; + + setf.sig ftmp = r_sym + mov r8=EFI_BUFFER_TOO_SMALL + ;; + cmp.geu Poom,p0 = fptr,fptr_limit + + xma.lu ftmp = ftmp,syment,symtab +(Poom) br.ret.sptk.few rp + ;; + getf.sig addr = ftmp + st8 [target] = gp + ;; + add addr = ST_VALUE_OFF, addr + ;; + ld8 val = [addr] + ;; + add val = val,ldbase + ;; + st8 [fptr] = val,16 + br.cond.sptk.few apply_relocs + + .endp _relocate + + .data + .align 16 +fptr_mem_base: + .space MAX_FUNCTION_DESCRIPTORS*16 +fptr_mem_limit: |