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/* vi: set sw=8 ts=8: */
/*
* Various assmbly language/system dependent hacks that are required
* so that we can minimize the amount of platform specific code.
*/
/*
* 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.
*/
#define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned long *)ARGS)
/*
* Initialization sequence for a GOT.
*/
#define INIT_GOT(GOT_BASE,MODULE) \
{ \
GOT_BASE[2] = (unsigned long)_dl_linux_resolve; \
GOT_BASE[1] = (unsigned long)(MODULE); \
}
/*
* 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.
*/
/*
* We need to do this stupidity here as the preprocessor will choke when
* SYMTAB is NULL if we do this in PERFORM_BOOTSTRAP_RELOC().
*/
#include <elf.h>
static inline int __extract_lsb_from_symtab(Elf32_Sym *symtab)
{
static int lsb = 0;
/* Check for SHmedia/SHcompact */
if (symtab)
lsb = symtab->st_other & 4;
return lsb;
}
/*
* While on the subject of stupidity, there appear to be some conflicts with
* regards to several relocation types as far as binutils is concerned
* (Barcelona and Madrid both appear to use an out of date elf.h, whereas
* native Catalonia has all of the necessary definitions. As a workaround,
* we'll just define them here for sanity..
*/
#ifndef R_SH_RELATIVE_LOW16
# define R_SH_RELATIVE_LOW16 197
# define R_SH_RELATIVE_MEDLOW16 198
# define R_SH_IMM_LOW16 246
# define R_SH_IMM_LOW16_PCREL 247
# define R_SH_IMM_MEDLOW16 248
# define R_SH_IMM_MEDLOW16_PCREL 249
#endif
#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \
const unsigned int r_type = ELF32_R_TYPE((RELP)->r_info); \
int lsb = __extract_lsb_from_symtab(SYMTAB); \
\
switch (r_type) { \
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) | lsb; \
break; \
case R_SH_RELATIVE: \
*(REL) = (LOAD) + (RELP)->r_addend; \
break; \
case R_SH_RELATIVE_LOW16: \
case R_SH_RELATIVE_MEDLOW16: \
{ \
unsigned long word, value; \
\
word = (unsigned long)(REL) & ~0x3fffc00; \
value = (LOAD) + (RELP)->r_addend; \
\
if (r_type == R_SH_RELATIVE_MEDLOW16) \
value >>= 16; \
\
word |= (value & 0xffff) << 10; \
*(REL) = word; \
break; \
} \
case R_SH_IMM_LOW16: \
case R_SH_IMM_MEDLOW16: \
{ \
unsigned long word, value; \
\
word = (unsigned long)(REL) & ~0x3fffc00; \
value = ((SYMBOL) + (RELP)->r_addend) | lsb; \
\
if (r_type == R_SH_IMM_MEDLOW16) \
value >>= 16; \
\
word |= (value & 0xffff) << 10; \
*(REL) = word; \
break; \
} \
case R_SH_IMM_LOW16_PCREL: \
case R_SH_IMM_MEDLOW16_PCREL: \
{ \
unsigned long word, value; \
\
word = (unsigned long)(REL) & ~0x3fffc00; \
value = (SYMBOL) + (RELP)->r_addend \
- (unsigned long)(REL); \
\
if (r_type == R_SH_IMM_MEDLOW16_PCREL) \
value >>= 16; \
\
word |= (value & 0xffff) << 10; \
*(REL) = word; \
break; \
} \
case R_SH_NONE: \
break; \
default: \
SEND_STDERR("BOOTSTRAP_RELOC: unhandled reloc type "); \
SEND_NUMBER_STDERR(ELF32_R_TYPE((RELP)->r_info), 1); \
SEND_STDERR("REL, SYMBOL, LOAD: "); \
SEND_ADDRESS_STDERR(REL, 0); \
SEND_STDERR(", "); \
SEND_ADDRESS_STDERR(SYMBOL, 0); \
SEND_STDERR(", "); \
SEND_ADDRESS_STDERR(LOAD, 1); \
_dl_exit(1); \
}
/*
* Transfer control to the user's application, once the dynamic loader
* is done. This routine has to exit the current function, then
* call the _dl_elf_main function.
*/
#define START() return _dl_elf_main;
/* Here we define the magic numbers that this dynamic loader should accept */
#define MAGIC1 EM_SH
#undef MAGIC2
/* Used for error messages */
#define ELF_TARGET "sh64"
struct elf_resolve;
extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
#define do_rem(result, n, base) result = (n % base)
/* 4096 bytes alignment */
#define PAGE_ALIGN 0xfffff000
#define ADDR_ALIGN 0xfff
#define OFFS_ALIGN 0x7ffff000
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