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1325 |
phoenix |
/* vi: set sw=8 ts=8: */
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/*
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* Various assmbly language/system dependent hacks that are required
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* so that we can minimize the amount of platform specific code.
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*/
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/*
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* Define this if the system uses RELOCA.
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*/
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#define ELF_USES_RELOCA
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/*
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* Get a pointer to the argv array. On many platforms this can be just
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* the address if the first argument, on other platforms we need to
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* do something a little more subtle here.
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*/
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#define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned long *)ARGS)
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/*
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* Initialization sequence for a GOT.
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*/
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#define INIT_GOT(GOT_BASE,MODULE) \
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{ \
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GOT_BASE[2] = (unsigned long)_dl_linux_resolve; \
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GOT_BASE[1] = (unsigned long)(MODULE); \
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}
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/*
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* Here is a macro to perform a relocation. This is only used when
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* bootstrapping the dynamic loader. RELP is the relocation that we
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* are performing, REL is the pointer to the address we are relocating.
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* SYMBOL is the symbol involved in the relocation, and LOAD is the
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* load address.
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*/
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/*
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* We need to do this stupidity here as the preprocessor will choke when
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* SYMTAB is NULL if we do this in PERFORM_BOOTSTRAP_RELOC().
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*/
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#include <elf.h>
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static inline int __extract_lsb_from_symtab(Elf32_Sym *symtab)
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{
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static int lsb = 0;
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/* Check for SHmedia/SHcompact */
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if (symtab)
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lsb = symtab->st_other & 4;
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return lsb;
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}
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/*
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* While on the subject of stupidity, there appear to be some conflicts with
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* regards to several relocation types as far as binutils is concerned
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* (Barcelona and Madrid both appear to use an out of date elf.h, whereas
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* native Catalonia has all of the necessary definitions. As a workaround,
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* we'll just define them here for sanity..
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*/
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#ifndef R_SH_RELATIVE_LOW16
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# define R_SH_RELATIVE_LOW16 197
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# define R_SH_RELATIVE_MEDLOW16 198
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# define R_SH_IMM_LOW16 246
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# define R_SH_IMM_LOW16_PCREL 247
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# define R_SH_IMM_MEDLOW16 248
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# define R_SH_IMM_MEDLOW16_PCREL 249
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#endif
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#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \
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const unsigned int r_type = ELF32_R_TYPE((RELP)->r_info); \
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int lsb = __extract_lsb_from_symtab(SYMTAB); \
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\
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switch (r_type) { \
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case R_SH_REL32: \
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*(REL) = (SYMBOL) + (RELP)->r_addend \
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- (unsigned long)(REL); \
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break; \
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case R_SH_DIR32: \
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case R_SH_GLOB_DAT: \
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case R_SH_JMP_SLOT: \
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*(REL) = ((SYMBOL) + (RELP)->r_addend) | lsb; \
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break; \
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case R_SH_RELATIVE: \
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*(REL) = (LOAD) + (RELP)->r_addend; \
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break; \
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case R_SH_RELATIVE_LOW16: \
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case R_SH_RELATIVE_MEDLOW16: \
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{ \
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unsigned long word, value; \
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\
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word = (unsigned long)(REL) & ~0x3fffc00; \
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value = (LOAD) + (RELP)->r_addend; \
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\
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if (r_type == R_SH_RELATIVE_MEDLOW16) \
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value >>= 16; \
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\
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word |= (value & 0xffff) << 10; \
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*(REL) = word; \
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break; \
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} \
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case R_SH_IMM_LOW16: \
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case R_SH_IMM_MEDLOW16: \
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{ \
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unsigned long word, value; \
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\
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word = (unsigned long)(REL) & ~0x3fffc00; \
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value = ((SYMBOL) + (RELP)->r_addend) | lsb; \
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\
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if (r_type == R_SH_IMM_MEDLOW16) \
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value >>= 16; \
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\
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word |= (value & 0xffff) << 10; \
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*(REL) = word; \
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break; \
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} \
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case R_SH_IMM_LOW16_PCREL: \
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case R_SH_IMM_MEDLOW16_PCREL: \
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{ \
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unsigned long word, value; \
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\
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word = (unsigned long)(REL) & ~0x3fffc00; \
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value = (SYMBOL) + (RELP)->r_addend \
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- (unsigned long)(REL); \
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\
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if (r_type == R_SH_IMM_MEDLOW16_PCREL) \
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value >>= 16; \
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\
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word |= (value & 0xffff) << 10; \
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*(REL) = word; \
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break; \
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} \
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case R_SH_NONE: \
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break; \
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default: \
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SEND_STDERR("BOOTSTRAP_RELOC: unhandled reloc type "); \
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SEND_NUMBER_STDERR(ELF32_R_TYPE((RELP)->r_info), 1); \
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SEND_STDERR("REL, SYMBOL, LOAD: "); \
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SEND_ADDRESS_STDERR(REL, 0); \
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SEND_STDERR(", "); \
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SEND_ADDRESS_STDERR(SYMBOL, 0); \
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SEND_STDERR(", "); \
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SEND_ADDRESS_STDERR(LOAD, 1); \
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_dl_exit(1); \
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}
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/*
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* Transfer control to the user's application, once the dynamic loader
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* is done. This routine has to exit the current function, then
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* call the _dl_elf_main function.
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*/
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#define START() return _dl_elf_main;
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/* Here we define the magic numbers that this dynamic loader should accept */
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#define MAGIC1 EM_SH
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#undef MAGIC2
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/* Used for error messages */
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#define ELF_TARGET "sh64"
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struct elf_resolve;
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extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
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#define do_rem(result, n, base) result = (n % base)
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/* 4096 bytes alignment */
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#define PAGE_ALIGN 0xfffff000
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#define ADDR_ALIGN 0xfff
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#define OFFS_ALIGN 0x7ffff000
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