diff options
Diffstat (limited to 'sysdeps/mips/elf')
| -rw-r--r-- | sysdeps/mips/elf/ldsodefs.h | 109 | ||||
| -rw-r--r-- | sysdeps/mips/elf/start.S | 119 |
2 files changed, 228 insertions, 0 deletions
diff --git a/sysdeps/mips/elf/ldsodefs.h b/sysdeps/mips/elf/ldsodefs.h new file mode 100644 index 0000000000..3868b50ff6 --- /dev/null +++ b/sysdeps/mips/elf/ldsodefs.h @@ -0,0 +1,109 @@ +/* Run-time dynamic linker data structures for loaded ELF shared objects. + Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _MIPS_LDSODEFS_H +#define _MIPS_LDSODEFS_H + +/* The MIPS ABI specifies that the dynamic section has to be read-only. */ + +#define DL_RO_DYN_SECTION 1 + +#include_next <ldsodefs.h> + +/* The 64-bit MIPS ELF ABI uses an unusual reloc format. Each + relocation entry specifies up to three actual relocations, all at + the same address. The first relocation which required a symbol + uses the symbol in the r_sym field. The second relocation which + requires a symbol uses the symbol in the r_ssym field. If all + three relocations require a symbol, the third one uses a zero + value. + + We define these structures in internal headers because we're not + sure we want to make them part of the ABI yet. Eventually, some of + this may move into elf/elf.h. */ + +/* An entry in a 64 bit SHT_REL section. */ + +typedef struct +{ + Elf32_Word r_sym; /* Symbol index */ + unsigned char r_ssym; /* Special symbol for 2nd relocation */ + unsigned char r_type3; /* 3rd relocation type */ + unsigned char r_type2; /* 2nd relocation type */ + unsigned char r_type1; /* 1st relocation type */ +} _Elf64_Mips_R_Info; + +typedef union +{ + Elf64_Xword r_info_number; + _Elf64_Mips_R_Info r_info_fields; +} _Elf64_Mips_R_Info_union; + +typedef struct +{ + Elf64_Addr r_offset; /* Address */ + _Elf64_Mips_R_Info_union r_info; /* Relocation type and symbol index */ +} Elf64_Mips_Rel; + +typedef struct +{ + Elf64_Addr r_offset; /* Address */ + _Elf64_Mips_R_Info_union r_info; /* Relocation type and symbol index */ + Elf64_Sxword r_addend; /* Addend */ +} Elf64_Mips_Rela; + +#define ELF64_MIPS_R_SYM(i) \ + ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym) +#define ELF64_MIPS_R_TYPE(i) \ + (((_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1 \ + | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \ + ).r_info_fields.r_type2 << 8) \ + | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \ + ).r_info_fields.r_type3 << 16) \ + | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \ + ).r_info_fields.r_ssym << 24)) +#define ELF64_MIPS_R_INFO(sym, type) \ + (__extension__ (_Elf64_Mips_R_Info_union) \ + (__extension__ (_Elf64_Mips_R_Info) \ + { (sym), ELF64_MIPS_R_SSYM (type), \ + ELF64_MIPS_R_TYPE3 (type), \ + ELF64_MIPS_R_TYPE2 (type), \ + ELF64_MIPS_R_TYPE1 (type) \ + }).r_info_number) +/* These macros decompose the value returned by ELF64_MIPS_R_TYPE, and + compose it back into a value that it can be used as an argument to + ELF64_MIPS_R_INFO. */ +#define ELF64_MIPS_R_SSYM(i) (((i) >> 24) & 0xff) +#define ELF64_MIPS_R_TYPE3(i) (((i) >> 16) & 0xff) +#define ELF64_MIPS_R_TYPE2(i) (((i) >> 8) & 0xff) +#define ELF64_MIPS_R_TYPE1(i) ((i) & 0xff) +#define ELF64_MIPS_R_TYPEENC(type1, type2, type3, ssym) \ + ((type1) \ + | ((Elf32_Word)(type2) << 8) \ + | ((Elf32_Word)(type3) << 16) \ + | ((Elf32_Word)(ssym) << 24)) + +#undef ELF64_R_SYM +#define ELF64_R_SYM(i) ELF64_MIPS_R_SYM (i) +#undef ELF64_R_TYPE +#define ELF64_R_TYPE(i) ELF64_MIPS_R_TYPE (i) +#undef ELF64_R_INFO +#define ELF64_R_INFO(sym, type) ELF64_MIPS_R_INFO ((sym), (type)) + +#endif diff --git a/sysdeps/mips/elf/start.S b/sysdeps/mips/elf/start.S new file mode 100644 index 0000000000..d9cc3b7ee2 --- /dev/null +++ b/sysdeps/mips/elf/start.S @@ -0,0 +1,119 @@ +/* Startup code compliant to the ELF Mips ABI. + Copyright (C) 1995, 1997, 2000, 2001, 2002, 2003, 2004 + Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + In addition to the permissions in the GNU Lesser General Public + License, the Free Software Foundation gives you unlimited + permission to link the compiled version of this file with other + programs, and to distribute those programs without any restriction + coming from the use of this file. (The GNU Lesser General Public + License restrictions do apply in other respects; for example, they + cover modification of the file, and distribution when not linked + into another program.) + + Note that people who make modified versions of this file are not + obligated to grant this special exception for their modified + versions; it is their choice whether to do so. The GNU Lesser + General Public License gives permission to release a modified + version without this exception; this exception also makes it + possible to release a modified version which carries forward this + exception. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#define __ASSEMBLY__ 1 +#include <entry.h> +#include <sgidefs.h> +#include <sys/asm.h> + +#ifndef ENTRY_POINT +#error ENTRY_POINT needs to be defined for start.S on MIPS/ELF. +#endif + +/* This is the canonical entry point, usually the first thing in the text + segment. The SVR4/Mips ABI (pages 3-31, 3-32) says that when the entry + point runs, most registers' values are unspecified, except for: + + v0 ($2) Contains a function pointer to be registered with `atexit'. + This is how the dynamic linker arranges to have DT_FINI + functions called for shared libraries that have been loaded + before this code runs. + + sp ($29) The stack contains the arguments and environment: + 0(%esp) argc + 4(%esp) argv[0] + ... + (4*argc)(%esp) NULL + (4*(argc+1))(%esp) envp[0] + ... + NULL + ra ($31) The return address register is set to zero so that programs + that search backword through stack frames recognize the last + stack frame. +*/ + + +/* We need to call: + __libc_start_main (int (*main) (int, char **, char **), int argc, + char **argv, void (*init) (void), void (*fini) (void), + void (*rtld_fini) (void), void *stack_end) +*/ + + .text + .globl ENTRY_POINT + .type ENTRY_POINT,@function +ENTRY_POINT: +#ifdef __PIC__ + SETUP_GPX($0) + SETUP_GPX64($25,$0) +#else + PTR_LA $28, _gp /* Setup GP correctly if we're non-PIC. */ + move $31, $0 +#endif + + PTR_LA $4, main /* main */ + PTR_L $5, 0($29) /* argc */ + PTR_ADDIU $6, $29, PTRSIZE /* argv */ + + /* Allocate space on the stack for seven arguments (o32 only) + and make sure the stack is aligned to double words (8 bytes) + on o32 and quad words (16 bytes) on n32 and n64. */ + + and $29, -2 * SZREG +#if _MIPS_SIM == _ABIO32 + PTR_SUBIU $29, 32 +#endif + PTR_LA $7, __libc_csu_init /* init */ + PTR_LA $8, __libc_csu_fini +#if _MIPS_SIM == _ABIO32 + PTR_S $8, 16($29) /* fini */ + PTR_S $2, 20($29) /* rtld_fini */ + PTR_S $29, 24($29) /* stack_end */ +#else + move $9, $2 /* rtld_fini */ + move $10, $29 /* stack_end */ +#endif + jal __libc_start_main +hlt: b hlt /* Crash if somehow it does return. */ + +/* Define a symbol for the first piece of initialized data. */ + .data + .globl __data_start +__data_start: + .long 0 + .weak data_start + data_start = __data_start |