diff options
Diffstat (limited to 'ldso/ldso/sh64/dl-startup.h')
| -rw-r--r-- | ldso/ldso/sh64/dl-startup.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/ldso/ldso/sh64/dl-startup.h b/ldso/ldso/sh64/dl-startup.h index 4c6f3c5e2..9c92e221f 100644 --- a/ldso/ldso/sh64/dl-startup.h +++ b/ldso/ldso/sh64/dl-startup.h @@ -23,3 +23,138 @@ asm("" \ #define DL_BOOT(X) static void __attribute__ ((unused)) _dl_boot2 (X) +/* + * 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) + +/* + * 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+ * regards to several relocation types as far as binutils is concerned + * (Barcelona and Madrid both appear to use an out of date elf.h, whereas + * native Catalonia has all of the necessary definitions.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; + + |