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/* 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:
#if defined(__ELF__) && defined(__linux__)
.section .note.GNU-stack,"",%progbits
#endif
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