123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126 |
- /* 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("" \
- " .section .text..SHmedia32,\"ax\"\n" \
- " .globl _start\n" \
- " .type _start, @function\n" \
- " .align 5\n" \
- "_start:\n" \
- " ! Set r12 to point to GOT\n" \
- " movi (((datalabel _GLOBAL_OFFSET_TABLE_-(.LZZZ3-.)) >> 16) & 0xffff), r12\n" \
- " shori ((datalabel _GLOBAL_OFFSET_TABLE_-(.LZZZ3-.)) & 0xffff), r12\n" \
- ".LZZZ3:\n" \
- " ptrel/u r12, tr0\n" \
- " gettr tr0, r12 ! GOT address\n" \
- " add r18, r63, r11 ! save return address - needed?\n" \
- " add r15, r63, r2 ! arg = stack pointer\n" \
- " pt _dl_start, tr0 ! should work even if PIC\n" \
- " blink tr0, r18 ! call _dl_start - user EP is in r2\n" \
- " add r2, r63, r28\n" \
- " movi (((_dl_fini@GOT) >> 16) & 0xffff), r1\n" \
- " shori ((_dl_fini@GOT) & 0xffff), r1\n" \
- " ldx.l r1, r12, r2\n" \
- " add r11, r63, r18\n" \
- " ptabs/l r28, tr0\n" \
- " blink tr0, r63\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)+1)
- /*
- * 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.
- */
- #include <elf.h>
- #define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \
- const unsigned int r_type = ELF32_R_TYPE((RELP)->r_info); \
- int lsb = !!((SYMTAB)->st_other & STO_SH5_ISA32); \
- \
- 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: \
- _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;
|