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/* vi: set sw=4 ts=4: */
/*
* Architecture specific code used by dl-startup.c
* Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
*/
/* Perform operation OP with PC-relative SRC as the first operand and
* DST as the second. TMP is available as a temporary if needed. */
#ifdef __mcoldfire__
#define PCREL_OP(OP, SRC, DST, TMP, PC) \
"move.l #" SRC " - ., " TMP "\n\t" OP " (-8, " PC ", " TMP "), " DST
#else
#define PCREL_OP(OP, SRC, DST, TMP, PC) \
OP " " SRC "(" PC "), " DST
#endif
__asm__ ("\
.text\n\
.globl _start\n\
.type _start,@function\n\
.hidden _start\n\
_start:\n\
move.l %sp, -(%sp)\n\
jbsr _dl_start\n\
addq.l #4, %sp\n\
/* FALLTHRU */\n\
\n\
.globl _dl_start_user\n\
.type _dl_start_user,@function\n\
_dl_start_user:\n\
# Save the user entry point address in %a4.\n\
move.l %d0, %a4\n\
# See if we were run as a command with the executable file\n\
# name as an extra leading argument.\n\
" PCREL_OP ("move.l", "_dl_skip_args", "%d0", "%d0", "%pc") "\n\
# Pop the original argument count\n\
move.l (%sp)+, %d1\n\
# Subtract _dl_skip_args from it.\n\
sub.l %d0, %d1\n\
# Adjust the stack pointer to skip _dl_skip_args words.\n\
lea (%sp, %d0*4), %sp\n\
# Push back the modified argument count.\n\
move.l %d1, -(%sp)\n\
# Pass our finalizer function to the user in %a1.\n\
" PCREL_OP ("lea", "_dl_fini", "%a1", "%a1", "%pc") "\n\
# Initialize %fp with the stack pointer.\n\
move.l %sp, %fp\n\
# Jump to the user's entry point.\n\
jmp (%a4)\n\
.size _dl_start_user, . - _dl_start_user\n\
.previous");
/* Get a pointer to the argv array. On many platforms this can be just
* the address of 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)
/* Handle relocation of the symbols in the dynamic loader. */
static __always_inline
void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, unsigned long *reloc_addr,
unsigned long symbol_addr, unsigned long load_addr, Elf32_Sym *symtab)
{
switch (ELF_R_TYPE(rpnt->r_info))
{
case R_68K_8:
*(char *) reloc_addr = symbol_addr + rpnt->r_addend;
break;
case R_68K_16:
*(short *) reloc_addr = symbol_addr + rpnt->r_addend;
break;
case R_68K_32:
*reloc_addr = symbol_addr + rpnt->r_addend;
break;
case R_68K_PC8:
*(char *) reloc_addr = (symbol_addr + rpnt->r_addend
- (unsigned int) reloc_addr);
break;
case R_68K_PC16:
*(short *) reloc_addr = (symbol_addr + rpnt->r_addend
- (unsigned int) reloc_addr);
break;
case R_68K_PC32:
*reloc_addr = (symbol_addr + rpnt->r_addend
- (unsigned int) reloc_addr);
break;
case R_68K_GLOB_DAT:
case R_68K_JMP_SLOT:
*reloc_addr = symbol_addr;
break;
case R_68K_RELATIVE:
*reloc_addr = ((unsigned int) load_addr +
(rpnt->r_addend ? : *reloc_addr));
break;
default:
_dl_exit (1);
}
}
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