2 * Copyright (c) 2001 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/boot/efi/libefi/arch/ia64/start.S,v 1.6 2002/12/10 04:14:01 marcel Exp $
27 * $DragonFly: src/sys/boot/efi/libefi/arch/ia64/start.S,v 1.1 2003/11/10 06:08:33 dillon Exp $
32 #include <machine/asm.h>
35 #define EFI_LOAD_ERROR 1
36 #define EFI_BUFFER_TOO_SMALL 5
38 #define DT_NULL 0 /* Terminating entry. */
39 #define DT_NEEDED 1 /* String table offset of a needed shared
41 #define DT_PLTRELSZ 2 /* Total size in bytes of PLT relocations. */
42 #define DT_PLTGOT 3 /* Processor-dependent address. */
43 #define DT_HASH 4 /* Address of symbol hash table. */
44 #define DT_STRTAB 5 /* Address of string table. */
45 #define DT_SYMTAB 6 /* Address of symbol table. */
46 #define DT_RELA 7 /* Address of ElfNN_Rela relocations. */
47 #define DT_RELASZ 8 /* Total size of ElfNN_Rela relocations. */
48 #define DT_RELAENT 9 /* Size of each ElfNN_Rela relocation entry. */
49 #define DT_STRSZ 10 /* Size of string table. */
50 #define DT_SYMENT 11 /* Size of each symbol table entry. */
51 #define DT_INIT 12 /* Address of initialization function. */
52 #define DT_FINI 13 /* Address of finalization function. */
53 #define DT_SONAME 14 /* String table offset of shared object
55 #define DT_RPATH 15 /* String table offset of library path. */
56 #define DT_SYMBOLIC 16 /* Indicates "symbolic" linking. */
57 #define DT_REL 17 /* Address of ElfNN_Rel relocations. */
58 #define DT_RELSZ 18 /* Total size of ElfNN_Rel relocations. */
59 #define DT_RELENT 19 /* Size of each ElfNN_Rel relocation. */
60 #define DT_PLTREL 20 /* Type of relocation used for PLT. */
61 #define DT_DEBUG 21 /* Reserved (not used). */
62 #define DT_TEXTREL 22 /* Indicates there may be relocations in
63 non-writable segments. */
64 #define DT_JMPREL 23 /* Address of PLT relocations. */
66 #define DT_COUNT 24 /* Number of defined d_tag values. */
68 #define R_IA64_NONE 0 /* None */
69 #define R_IA64_DIR64MSB 0x26 /* word64 MSB S + A */
70 #define R_IA64_DIR64LSB 0x27 /* word64 LSB S + A */
71 #define R_IA64_FPTR64MSB 0x46 /* word64 MSB @fptr(S + A) */
72 #define R_IA64_FPTR64LSB 0x47 /* word64 LSB @fptr(S + A) */
73 #define R_IA64_REL64MSB 0x6e /* word64 MSB BD + A */
74 #define R_IA64_REL64LSB 0x6f /* word64 LSB BD + A */
75 #define R_IA64_IPLTLSB 0x81 /* function descriptor LSB speciaal */
78 alloc loc0=ar.pfs,2,3,3,0
80 movl loc2=@gprel(ImageBase)
87 br.call.sptk.few rp=_reloc // relocate image
89 cmp.ne p6,p0=EFI_SUCCESS,r8 // did it work?
90 (p6) br.cond.dpnt.few 9f
92 mov out0=in0 // image_handle
93 mov out1=in1 // system_table
94 br.call.sptk.few rp=efi_main
103 .global _start_plabel
104 .section .plabel, "a"
111 // A PE32+ relocation entry for the plabel
116 .short (10 << 12) + 0
117 .short (10 << 12) + 8
123 // XXX Assumes PLT relocations are of type Elf_Rela
125 // r2 = address of fptr_storage
126 // r3 = address of fptr_storage_end
127 // r4 = address of first free fptr
130 // r16 = r_info -OR- d_tag
131 // r17 = r_addend -OR- d_val (=d_ptr)
132 // r18 = address of .rela dynamic section
133 // r19 = size of .rela section
134 // r20 = size of .rela element (Elf_Rela)
135 // r21 = address of first PLT relocation
136 // r22 = size of PLT relocations
137 // r23 = relocation type
138 // r24 = address of symbol
139 // r28 = R_IA64_IPLTLSB
140 // f8 = address of symbol table
141 // f9 = size of symtab element
143 STATIC_ENTRY(_reloc, 2)
144 alloc loc0=ar.pfs,2,2,0,0
147 movl r29=@gprel(_DYNAMIC) // find _DYNAMIC etc.
150 movl r29=@gprel(fptr_storage)
153 movl r29=@gprel(fptr_storage_end)
160 mov r28=R_IA64_IPLTLSB
163 ld8 r16=[r15],8 // read r15->d_tag
165 ld8 r17=[r15],8 // and r15->d_val
167 cmp.eq p6,p0=DT_NULL,r16 // done?
168 (p6) br.cond.dpnt.few 2f
170 cmp.eq p6,p0=DT_RELA,r16 // rela section?
173 cmp.eq p6,p0=DT_RELASZ,r16 // rela section size?
176 cmp.eq p6,p0=DT_RELAENT,r16 // rela entry size?
179 cmp.eq p6,p0=DT_JMPREL,r16 // PLT relocs?
182 cmp.eq p6,p0=DT_PLTRELSZ,r16 // PLT relocs size?
185 cmp.eq p6,p0=DT_SYMTAB,r16 // symbol table?
190 cmp.eq p6,p0=DT_SYMENT,r16 // symbol entry size?
210 ld8 r29=[r18],8 // read r_offset
212 ld8 r16=[r18],8 // read r_info
213 add r15=r29,in0 // relocate r_offset
215 ld8 r17=[r18],8 // read r_addend
216 sub r19=r19,r20 // update relasz
217 extr.u r23=r16,0,32 // ELF64_R_TYPE(r16)
219 cmp.eq p6,p0=R_IA64_NONE,r23
220 (p6) br.cond.dpnt.few 2b
222 cmp.eq p6,p0=R_IA64_REL64LSB,r23
223 (p6) br.cond.dptk.few 4f
225 extr.u r29=r16,32,32 // ELF64_R_SYM(r16)
227 setf.sig f10=r29 // so we can multiply
229 xma.lu f10=f10,f9,f8 // f10=symtab + r_sym*syment
233 add r29=8,r29 // address of st_value
235 ld8 r29=[r29] // read symbol value
237 add r24=r29,in0 // relocate symbol value
239 cmp.eq p6,p0=R_IA64_DIR64LSB,r23
240 (p6) br.cond.dptk.few 5f
242 cmp.eq p6,p0=R_IA64_FPTR64LSB,r23
243 (p6) br.cond.dptk.few 6f
245 cmp.ne p6,p0=r28,r23 // IPLTLSB
246 (p6) br.cond.dptk.few 2b
249 add r29=r24,r17 // S + A
251 st8 [r15]=r29,8 // fdesc:FP
253 st8 [r15]=gp // fdesc:GP
258 add r29=in0,r17 // BD + A
260 st8 [r15]=r29 // word64
265 add r29=r24,r17 // S + A
267 st8 [r15]=r29 // word64
271 mov r29=r2 // FPTR64LSB
274 cmp.geu p6,p0=r29,r4 // end of fptrs?
275 (p6) br.cond.dpnt.few 8f // can't find existing fptr
276 ld8 r17=[r29] // read function from fptr
278 cmp.eq p6,p0=r24,r17 // same function?
280 (p6) st8 [r15]=r29 // reuse fptr
281 (p6) br.cond.sptk.few 2b // done
282 add r29=16,r29 // next fptr
285 mov r8=EFI_BUFFER_TOO_SMALL // failure return value
286 cmp.geu p6,p0=r4,r3 // space left?
287 (p6) br.cond.dpnt.few 9f // bail out
288 st8 [r15]=r4 // install fptr
290 st8 [r4]=r24,8 // write fptr address
292 st8 [r4]=gp,8 // write fptr gp
305 .space 1024*16 // XXX