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/* 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.
* Copyright (C) 2005 by Joakim Tjernlund
* Copyright (C) 2005 by Erik Andersen
*/
asm(""
" .text\n"
" .globl _start\n"
" .ent _start\n"
" .type _start,@function\n"
"_start:\n"
" .set noreorder\n"
" move $25, $31\n"
" bal 0f\n"
" nop\n"
"0:\n"
" .cpload $31\n"
" move $31, $25\n"
" .set reorder\n"
" la $4, _DYNAMIC\n"
" sw $4, -0x7ff0($28)\n"
" move $4, $29\n"
" subu $29, 16\n"
" la $8, .coff\n"
" bltzal $8, .coff\n"
".coff:\n"
" subu $8, $31, $8\n"
" la $25, _dl_start\n"
" addu $25, $8\n"
" jalr $25\n"
" addiu $29, 16\n"
" move $16, $28\n"
" move $17, $2\n"
" lw $2, _dl_skip_args\n"
" beq $2, $0, 1f\n"
" lw $4, 0($29)\n"
" subu $4, $2\n"
" sll $2, 2\n"
" addu $29, $2\n"
" sw $4, 0($29)\n"
"1:\n"
" lw $5, 0($29)\n"
" la $6, 4 ($29)\n"
" sll $7, $5, 2\n"
" addu $7, $7, $6\n"
" addu $7, $7, 4\n"
" and $2, $29, -2 * 4\n"
" sw $29, -4($2)\n"
" subu $29, $2, 32\n"
" .cprestore 16\n"
" lw $29, 28($29)\n"
" la $2, _dl_fini\n"
" move $25, $17\n"
" jr $25\n"
".end _start\n"
".size _start, . -_start\n"
"\n\n"
"\n\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)+1)
/* We can't call functions earlier in the dl startup process */
#define NO_FUNCS_BEFORE_BOOTSTRAP
/*
* Here is a macro to perform the GOT relocation. This is only
* used when bootstrapping the dynamic loader.
*/
#define PERFORM_BOOTSTRAP_GOT(tpnt) \
do { \
Elf32_Sym *sym; \
Elf32_Addr i; \
register ElfW(Addr) gp __asm__ ("$28"); \
Elf32_Addr *mipsgot = elf_mips_got_from_gpreg (gp); \
\
/* Add load address displacement to all local GOT entries */ \
i = 2; \
while (i < tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX]) \
mipsgot[i++] += tpnt->loadaddr; \
\
/* Handle global GOT entries */ \
mipsgot += tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX]; \
sym = (Elf32_Sym *) tpnt->dynamic_info[DT_SYMTAB] + \
tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX]; \
i = tpnt->dynamic_info[DT_MIPS_SYMTABNO_IDX] - tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];\
\
while (i--) { \
if (sym->st_shndx == SHN_UNDEF || \
sym->st_shndx == SHN_COMMON) \
*mipsgot = tpnt->loadaddr + sym->st_value; \
else if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC && \
*mipsgot != sym->st_value) \
*mipsgot += tpnt->loadaddr; \
else if (ELF32_ST_TYPE(sym->st_info) == STT_SECTION) { \
if (sym->st_other == 0) \
*mipsgot += tpnt->loadaddr; \
} \
else \
*mipsgot = tpnt->loadaddr + sym->st_value; \
\
mipsgot++; \
sym++; \
} \
} while (0)
/*
* 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,SYMTAB) \
switch(ELF32_R_TYPE((RELP)->r_info)) { \
case R_MIPS_REL32: \
if (SYMTAB) { \
if (symtab_index<tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX])\
*REL += SYMBOL; \
} \
else { \
*REL += LOAD; \
} \
break; \
case R_MIPS_NONE: \
break; \
default: \
SEND_STDERR("Aiieeee!"); \
_dl_exit(1); \
}
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