1 /* vi: set sw=4 ts=4: */
3 * Various assmbly language/system dependent hacks that are required
4 * so that we can minimize the amount of platform specific code.
5 * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
8 /* Define this if the system uses RELOCA. */
9 #define ELF_USES_RELOCA
12 * Initialization sequence for a GOT. For the Sparc, this points to the
13 * PLT, and we need to initialize a couple of the slots. The PLT should
17 * call _dl_linux_resolve
19 * .word implementation_dependent
21 #define INIT_GOT(GOT_BASE,MODULE) \
23 GOT_BASE[0] = 0x9de3bfc0; /* save %sp, -64, %sp */ \
24 GOT_BASE[1] = 0x40000000 | (((unsigned int) _dl_linux_resolve - (unsigned int) GOT_BASE - 4) >> 2); \
25 GOT_BASE[2] = 0x01000000; /* nop */ \
26 GOT_BASE[3] = (int) MODULE; \
29 /* Here we define the magic numbers that this dynamic loader should accept
30 * Note that SPARCV9 doesn't use EM_SPARCV9 since the userland is still 32-bit.
32 #if defined(__sparc_v9__) || defined(__sparc_v8__)
33 #define MAGIC1 EM_SPARC32PLUS
35 #define MAGIC1 EM_SPARC
40 /* Used for error messages */
41 #define ELF_TARGET "sparc"
44 unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
47 * Define this if you want a dynamic loader that works on Solaris.
51 /* Cheap modulo implementation, taken from arm/ld_sysdep.h. */
52 static __inline__ unsigned long
53 sparc_mod(unsigned long m, unsigned long p)
55 unsigned long i, t, inc;
60 while (!(i & (1 << 31))) {
67 for (inc = t; inc > 2; inc--) {
89 #define do_rem(result, n, base) ((result) = sparc_mod(n, base))
92 /* 4096 bytes alignment */
93 #if defined(__sparc_v9__)
94 /* ...but 8192 is required for mmap() on sparc64 kernel */
95 #define PAGE_ALIGN 0xffffe000
96 #define ADDR_ALIGN 0x1fff
97 #define OFFS_ALIGN 0x7fffe000
98 #elif defined(__sparc_v8__)
99 #define PAGE_ALIGN 0xfffff000
100 #define ADDR_ALIGN 0xfff
101 #define OFFS_ALIGN 0x7ffff000
104 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
105 PLT entries should not be allowed to define the value.
106 ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
107 of the main executable's symbols, as for a COPY reloc. */
108 #define elf_machine_type_class(type) \
109 ((((type) == R_SPARC_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
110 | (((type) == R_SPARC_COPY) * ELF_RTYPE_CLASS_COPY))
112 /* The SPARC overlaps DT_RELA and DT_PLTREL. */
113 #define ELF_MACHINE_PLTREL_OVERLAP 1
115 /* We have to do this because elf_machine_{dynamic,load_address} can be
116 invoked from functions that have no GOT references, and thus the compiler
117 has no obligation to load the PIC register. */
118 #define LOAD_PIC_REG(PIC_REG) \
119 do { register Elf32_Addr pc __asm__("o7"); \
120 __asm__("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t" \
122 "add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n" \
123 "1:\tadd %1, %0, %1" \
124 : "=r" (pc), "=r" (PIC_REG)); \
127 /* Return the link-time address of _DYNAMIC. Conveniently, this is the
128 first element of the GOT. This must be inlined in a function which
130 static __inline__ Elf32_Addr
131 elf_machine_dynamic (void)
133 register Elf32_Addr *got __asm__ ("%l7");
140 /* Return the run-time load address of the shared object. */
141 static __inline__ Elf32_Addr
142 elf_machine_load_address (void)
144 register Elf32_Addr *pc __asm__ ("%o7"), *got __asm ("%l7");
146 __asm__ ("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t"
148 " add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n\t"
150 "call _GLOBAL_OFFSET_TABLE_\n"
151 "1:\tadd %1, %0, %1\n\t" : "=r" (pc), "=r" (got));
153 /* got is now l_addr + _GLOBAL_OFFSET_TABLE_
155 pc[2]*4 is l_addr + _DYNAMIC - (long)pc - 8
156 pc[3]*4 is l_addr + _GLOBAL_OFFSET_TABLE_ - (long)pc - 12 */
157 return (Elf32_Addr) got - *got + (pc[2] - pc[3]) * 4 - 4;
160 static __inline__ void
161 elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
162 Elf32_Word relative_count)
164 Elf32_Rela * rpnt = (void *)rel_addr;
167 Elf32_Addr *const reloc_addr = (void *) (load_off + (++rpnt)->r_offset);
169 *reloc_addr = load_off + rpnt->r_addend;
170 } while (--relative_count);