1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
/*
* Various assmbly language/system dependent hacks that are required
* so that we can minimize the amount of platform specific code.
*/
#define LINUXBIN
/*
* Define this if the system uses RELOCA.
*/
#define ELF_USES_RELOCA
/*
* Get a pointer to the argv array. On many platforms this can be just
* the address if the first argument, on other platforms we need to
* do something a little more subtle here. We assume that argc is stored
* at the word just below the argvp that we return here.
*/
#define GET_ARGV(ARGVP, ARGS) __asm__("\tadd %%fp,68,%0\n" : "=r" (ARGVP));
/*
* Initialization sequence for a GOT. For the Sparc, this points to the
* PLT, and we need to initialize a couple of the slots. The PLT should
* look like:
*
* save %sp, -64, %sp
* call _dl_linux_resolve
* nop
* .word implementation_dependent
*/
#define INIT_GOT(GOT_BASE,MODULE) \
{ \
GOT_BASE[0] = 0x9de3bfc0; /* save %sp, -64, %sp */ \
GOT_BASE[1] = 0x40000000 | (((unsigned int) _dl_linux_resolve - (unsigned int) GOT_BASE - 4) >> 2); \
GOT_BASE[2] = 0x01000000; /* nop */ \
GOT_BASE[3] = (int) MODULE; \
}
/*
* Here is a macro to perform a relocation. This is only used when
* bootstrapping the dynamic loader.
*/
#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD) \
switch(ELF32_R_TYPE((RELP)->r_info)) { \
case R_SPARC_32: \
*REL = SYMBOL + (RELP)->r_addend; \
break; \
case R_SPARC_GLOB_DAT: \
*REL = SYMBOL + (RELP)->r_addend; \
break; \
case R_SPARC_JMP_SLOT: \
REL[1] = 0x03000000 | ((SYMBOL >> 10) & 0x3fffff); \
REL[2] = 0x81c06000 | (SYMBOL & 0x3ff); \
break; \
case R_SPARC_NONE: \
break; \
case R_SPARC_WDISP30: \
break; \
case R_SPARC_RELATIVE: \
*REL += (unsigned int) LOAD + (RELP)->r_addend; \
break; \
default: \
_dl_exit(1); \
}
/*
* Transfer control to the user's application, once the dynamic loader
* is done. The crt calls atexit with $g1 if not null, so we need to
* ensure that it contains NULL.
*/
#define START() \
__asm__ volatile ( \
"add %%g0,%%g0,%%g1\n\t" \
"jmpl %0, %%o7\n\t" \
"restore %%g0,%%g0,%%g0\n\t" \
: /*"=r" (status) */ : \
"r" (_dl_elf_main): "g1", "o0", "o1")
/* Here we define the magic numbers that this dynamic loader should accept */
#define MAGIC1 EM_SPARC
#undef MAGIC2
/* Used for error messages */
#define ELF_TARGET "Sparc"
#ifndef COMPILE_ASM
extern unsigned int _dl_linux_resolver(unsigned int reloc_entry,
unsigned int * i);
#endif
/*
* Define this if you want a dynamic loader that works on Solaris.
*/
#define SOLARIS_COMPATIBLE
/*
* Define this because we do not want to call .udiv in the library.
* Change on the plans -miguel:
* We just statically link against .udiv. This is required
* if we want to be able to run on Sun4c machines.
*/
/* We now link .urem against this one */
#ifdef USE_V8
#define do_rem(result,n,base) ({ \
volatile int __res; \
__asm__("mov %%g0,%%Y\n\t" \
"sdiv %2,%3,%%l6\n\t" \
"smul %%l6,%3,%%l6\n\t" \
"sub %2,%%l6,%0\n\t" \
:"=r" (result),"=r" (__res):"r" (n),"r"(base) : "l6" ); __res; })
#else
#define do_rem(a,b,c) a = _dl_urem (b,c);
#endif
/*
* dbx wants the binder to have a specific name. Mustn't disappoint it.
*/
#ifdef SOLARIS_COMPATIBLE
#define _dl_linux_resolve _elf_rtbndr
#endif
|
