diff options
Diffstat (limited to 'ldso/ldso/c6x/dl-startup.h')
| -rw-r--r-- | ldso/ldso/c6x/dl-startup.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/ldso/ldso/c6x/dl-startup.h b/ldso/ldso/c6x/dl-startup.h new file mode 100644 index 000000000..b9ea30409 --- /dev/null +++ b/ldso/ldso/c6x/dl-startup.h @@ -0,0 +1,122 @@ +/* Copyright (C) 2010 Texas Instruments Incorporated + * Contributed by Mark Salter <msalter@redhat.com> + * + * Borrowed heavily from frv arch: + * Copyright (C) 2003 Red Hat, Inc. + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +#undef DL_START +#define DL_START(X) \ +int \ +_dl_start (unsigned placeholder, \ + struct elf32_dsbt_loadmap *dl_boot_progmap, \ + struct elf32_dsbt_loadmap *dl_boot_ldsomap, \ + Elf32_Dyn *dl_boot_ldso_dyn_pointer, \ + X) + +/* + * On entry, the kernel has set up the stack thusly: + * + * 0(sp) pad0 + * 4(sp) pad1 + * 8(sp) argc + * 12(sp) argv[0] + * ... + * (4*(argc+3))(sp) NULL + * (4*(argc+4))(sp) envp[0] + * ... + * NULL + * + * Register values are unspecified, except: + * + * B4 --> executable loadmap address + * A6 --> interpreter loadmap address + * B6 --> dynamic section address + * B14 --> our DP setup by kernel + * + * NB: DSBT index is always 0 for the executable + * and 1 for the interpreter + */ + +__asm__(" .text\n" + ".globl _start\n" + "_start:\n" + " B .S2 _dl_start\n" + " STW .D2T2 B14, *+B14[1]\n" + " ADD .D1X B15,8,A8\n" + " ADDKPC .S2 ret_from_dl,B3,2\n" + "ret_from_dl:\n" + " B .S2X A4\n" + " || LDW .D2T2 *+B14[0],B14\n" + " ADDKPC .S2 __dl_fini,B0,0\n" + " MV .S1X B0,A4\n" + " NOP\n" + " NOP\n" + " NOP\n" + "__dl_fini:\n" + " LDW .D2T2 *+B14[1],B14\n" + " NOP 4\n" + " LDW .D2T1 *+B14($GOT(_dl_fini)), A0\n" + " NOP 4\n" + " BNOP .S2X A0, 5\n"); + +__asm__(" .text\n" + "__c6x_cache_sync:\n" + " MVK .S2 330,B0\n" + " SWE\n" + " NOP\n" + " BNOP .S2 B3,5\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + "\n" +); + +/* + * Get a pointer to the argv array. On many platforms this can be just + * the address of 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) + +struct elf32_dsbt_loadmap; + +/* + * 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) \ + switch(ELF32_R_TYPE((RELP)->r_info)){ \ + case R_C6000_ABS_L16: \ + { \ + unsigned int opcode = *(REL); \ + unsigned int v = (SYMBOL) + (RELP)->r_addend; \ + opcode &= ~0x7fff80; \ + opcode |= ((v & 0xffff) << 7); \ + *(REL) = opcode; \ + } \ + break; \ + case R_C6000_ABS_H16: \ + { \ + unsigned int opcode = *(REL); \ + unsigned int v = (SYMBOL) + (RELP)->r_addend; \ + opcode &= ~0x7fff80; \ + opcode |= ((v >> 9) & 0x7fff80); \ + *(REL) = opcode; \ + } \ + break; \ + case R_C6000_ABS32: \ + *(REL) = (SYMBOL) + (RELP)->r_addend; \ + break; \ + default: \ + _dl_exit(1); \ + } + +extern void __c6x_cache_sync(unsigned long start, unsigned long end) + attribute_hidden; |