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/*
* 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)+1)
/*
* Initialization sequence for a GOT.
*/
#define INIT_GOT(GOT_BASE,MODULE) _dl_init_got(GOT_BASE,MODULE)
/* Stuff for the PLT. */
#define PLT_INITIAL_ENTRY_WORDS 18
#define PLT_LONGBRANCH_ENTRY_WORDS 0
#define PLT_TRAMPOLINE_ENTRY_WORDS 6
#define PLT_DOUBLE_SIZE (1<<13)
#define PLT_ENTRY_START_WORDS(entry_number) \
(PLT_INITIAL_ENTRY_WORDS + (entry_number)*2 \
+ ((entry_number) > PLT_DOUBLE_SIZE \
? ((entry_number) - PLT_DOUBLE_SIZE)*2 \
: 0))
#define PLT_DATA_START_WORDS(num_entries) PLT_ENTRY_START_WORDS(num_entries)
/* Macros to build PowerPC opcode words. */
#define OPCODE_ADDI(rd,ra,simm) \
(0x38000000 | (rd) << 21 | (ra) << 16 | ((simm) & 0xffff))
#define OPCODE_ADDIS(rd,ra,simm) \
(0x3c000000 | (rd) << 21 | (ra) << 16 | ((simm) & 0xffff))
#define OPCODE_ADD(rd,ra,rb) \
(0x7c000214 | (rd) << 21 | (ra) << 16 | (rb) << 11)
#define OPCODE_B(target) (0x48000000 | ((target) & 0x03fffffc))
#define OPCODE_BA(target) (0x48000002 | ((target) & 0x03fffffc))
#define OPCODE_BCTR() 0x4e800420
#define OPCODE_LWZ(rd,d,ra) \
(0x80000000 | (rd) << 21 | (ra) << 16 | ((d) & 0xffff))
#define OPCODE_LWZU(rd,d,ra) \
(0x84000000 | (rd) << 21 | (ra) << 16 | ((d) & 0xffff))
#define OPCODE_MTCTR(rd) (0x7C0903A6 | (rd) << 21)
#define OPCODE_RLWINM(ra,rs,sh,mb,me) \
(0x54000000 | (rs) << 21 | (ra) << 16 | (sh) << 11 | (mb) << 6 | (me) << 1)
#define OPCODE_LI(rd,simm) OPCODE_ADDI(rd,0,simm)
#define OPCODE_ADDIS_HI(rd,ra,value) \
OPCODE_ADDIS(rd,ra,((value) + 0x8000) >> 16)
#define OPCODE_LIS_HI(rd,value) OPCODE_ADDIS_HI(rd,0,value)
#define OPCODE_SLWI(ra,rs,sh) OPCODE_RLWINM(ra,rs,sh,0,31-sh)
#define PPC_DCBST(where) asm volatile ("dcbst 0,%0" : : "r"(where) : "memory")
#define PPC_SYNC asm volatile ("sync" : : : "memory")
#define PPC_ISYNC asm volatile ("sync; isync" : : : "memory")
#define PPC_ICBI(where) asm volatile ("icbi 0,%0" : : "r"(where) : "memory")
#define PPC_DIE asm volatile ("tweq 0,0")
/*
* 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.
*/
#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \
{int type=ELF32_R_TYPE((RELP)->r_info); \
Elf32_Addr finaladdr=(SYMBOL)+(RELP)->r_addend;\
if (type==R_PPC_RELATIVE) { \
*REL=(Elf32_Word)(LOAD)+(RELP)->r_addend;\
} else if (type==R_PPC_JMP_SLOT) { \
Elf32_Sword delta=finaladdr-(Elf32_Word)(REL);\
*REL=OPCODE_B(delta); \
} else if (type==R_PPC_ADDR32) { \
*REL=finaladdr; \
} else { \
_dl_exit(100+ELF32_R_TYPE((RELP)->r_info)); \
} \
PPC_DCBST(REL); PPC_SYNC; PPC_ICBI(REL); \
}
/*
* 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.
*/
/* hgb@ifi.uio.no:
* Adding a clobber list consisting of r0 for %1. addi on PowerPC
* takes a register as the second argument, but if the register is
* r0, the value 0 is used instead. If r0 is used here, the stack
* pointer (r1) will be zeroed, and the dynamically linked
* application will seg.fault immediatly when receiving control.
*/
#define START() \
__asm__ volatile ( \
"addi 1,%1,0\n\t" \
"mtlr %0\n\t" \
"blrl\n\t" \
: : "r" (_dl_elf_main), "r" (args) \
: "r0")
/* Here we define the magic numbers that this dynamic loader should accept */
#define MAGIC1 EM_PPC
#undef MAGIC2
/* Used for error messages */
#define ELF_TARGET "powerpc"
struct elf_resolve;
extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
void _dl_init_got(unsigned long *lpnt,struct elf_resolve *tpnt);
#define do_rem(result, n, base) result = (n % base)
/* 4096 bytes alignment */
#define PAGE_ALIGN 0xfffff000
#define ADDR_ALIGN 0xfff
#define OFFS_ALIGN 0x7ffff000
/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
PLT entries should not be allowed to define the value.
ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
of the main executable's symbols, as for a COPY reloc. */
/* We never want to use a PLT entry as the destination of a
reloc, when what is being relocated is a branch. This is
partly for efficiency, but mostly so we avoid loops. */
#define elf_machine_type_class(type) \
((((type) == R_PPC_JMP_SLOT \
|| (type) == R_PPC_REL24 \
|| (type) == R_PPC_ADDR24) * ELF_RTYPE_CLASS_PLT) \
| (((type) == R_PPC_COPY) * ELF_RTYPE_CLASS_COPY))
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