summaryrefslogtreecommitdiff
path: root/ldso/ldso/sh/dl-startup.h
blob: 05e282bd88eaf9fd114a7d3093f8946c8719e5ce (plain)
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
/* Any assmbly language/system dependent hacks needed to setup boot1.c so it
 * will work as expected and cope with whatever platform specific wierdness is
 * needed for this architecture.  */

__asm__(
    "	.text\n"
    "	.globl	_start\n"
    "	.type	_start,@function\n"
    "_start:\n"
    "	mov	r15, r4\n"
    "	mov.l   .L_dl_start, r0\n"
    "	bsrf    r0\n"
    "	add	#4, r4\n"
    ".jmp_loc:\n"
    "	mov     r0, r8        ! Save the user entry point address in r8\n"
    "	mov.l   .L_got, r12   ! Load the GOT on r12\n"
    "	mova    .L_got, r0\n"
    "	add     r0, r12\n"
    "	mov.l   .L_dl_fini, r0\n"
    "	mov.l   @(r0,r12), r4 ! Pass the finalizer in r4\n"
    "	jmp     @r8\n"
    "	nop\n"
    ".L_dl_start:\n"
    "	.long   _dl_start-.jmp_loc\n"
    ".L_dl_fini:\n"
    "	.long	_dl_fini@GOT\n"
    ".L_got:\n"
    "	.long _GLOBAL_OFFSET_TABLE_\n"
    "	.size	_start,.-_start\n"
    "	.previous\n"
);

/*
 * 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.
 */
#define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned long*)   ARGS)

/* We can't call functions earlier in the dl startup process */
#define NO_FUNCS_BEFORE_BOOTSTRAP

/*
 * Here is a macro to perform a relocation.  This is only used when
 * bootstrapping the dynamic loader.  RELP is the relocation that we
 * are performing, REL is the pointer to the address we are relocating.
 * SYMBOL is the symbol involved in the relocation, and LOAD is the
 * load address.
 */
#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB)	\
	switch(ELF32_R_TYPE((RELP)->r_info)){			\
	case R_SH_REL32:					\
		*(REL)  = (SYMBOL) + (RELP)->r_addend		\
			    - (unsigned long)(REL);		\
		break;						\
	case R_SH_DIR32:					\
	case R_SH_GLOB_DAT:					\
	case R_SH_JMP_SLOT:					\
		*(REL)  = (SYMBOL) + (RELP)->r_addend;		\
		break;						\
	case R_SH_RELATIVE:					\
		*(REL)  = (LOAD) + (RELP)->r_addend;		\
		break;						\
	case R_SH_NONE:						\
		break;						\
	default:						\
		_dl_exit(1);					\
	}