From 379712737e3a9a70b9c5db165efbe45446336df9 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Wed, 29 Jun 2005 00:54:38 +0000 Subject: rename crt0.S to crt1.S and clean up so it actually works :) --- libc/sysdeps/linux/x86_64/crt0.S | 182 --------------------------------------- libc/sysdeps/linux/x86_64/crt1.S | 144 +++++++++++++++++++++++++++++++ 2 files changed, 144 insertions(+), 182 deletions(-) delete mode 100644 libc/sysdeps/linux/x86_64/crt0.S create mode 100644 libc/sysdeps/linux/x86_64/crt1.S (limited to 'libc/sysdeps/linux/x86_64') diff --git a/libc/sysdeps/linux/x86_64/crt0.S b/libc/sysdeps/linux/x86_64/crt0.S deleted file mode 100644 index fa08278d9..000000000 --- a/libc/sysdeps/linux/x86_64/crt0.S +++ /dev/null @@ -1,182 +0,0 @@ -/* Startup code compliant to the ELF x86-64 ABI. - Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Andreas Jaeger , 2001. - - 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. */ - -/* Originally based on glibc's sysdeps/x86_64/elf/start.S */ - -/* This is the canonical entry point, usually the first thing in the text - segment. The SVR4/i386 ABI (pages 3-31, 3-32) says that when the entry - point runs, most registers' values are unspecified, except for: - - %rdx 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. - - %rsp The stack contains the arguments and environment: - 0(%rsp) argc - 8(%rsp) argv[0] - ... - (8*argc)(%rsp) NULL - (8*(argc+1))(%rsp) envp[0] - ... - NULL -*/ - -#include - -.text - .global _start - .type _start,%function -#if defined L_crt0 || defined L_Scrt0 || ! defined __UCLIBC_CTOR_DTOR__ - .type __uClibc_main,%function -#else - .weak _init - .weak _fini - .type __uClibc_start_main,%function -#endif -/* Stick in a dummy reference to main(), so that if an application - * is linking when the main() function is in a static library (.a) - * we can be sure that main() actually gets linked in */ - .type main,%function - -_start: - /* Clear the frame pointer. The ABI suggests this be done, to mark - the outermost frame obviously. */ - xorq %rbp, %rbp - - /* Extract the arguments as encoded on the stack and set up - the arguments for __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). - The arguments are passed via registers and on the stack: - main: %rdi - argc: %rsi - argv: %rdx - init: %rcx - fini: %r8 - rtld_fini: %r9 - stack_end: stack. */ - -#if 0 - /* glibc */ - movq %rdx, %r9 /* Address of the shared library termination function. */ - popq %rsi /* Pop the argument count. */ - movq %rsp, %rdx /* argv starts just at the current stack top. */ - movq %rsi, %rbx /* now we calc envp ... envp = argc */ - addq $8, %rbx - shl $0x3, %rbx /* envp *= 8 */ - addq %rdx, %rbx /* envp += argv */ -#else - /* uclibc */ - movq %rdx, %r9 /* Address of the shared library termination function. */ - popq %rdi /* Pop the argument count. */ - movq %rsp, %rsi /* argv starts just at the current stack top. */ - movq %rdi, %rdx /* now we calc envp ... envp = argc */ - addq $8, %rdx - shl $0x3, %rdx /* envp *= 8 */ - addq %rsi, %rdx /* envp += argv */ -#endif - /* Align the stack to a 16 byte boundary to follow the ABI. */ - andq $~15, %rsp - - pushq %rax /* Push garbage because we push 8 more bytes. */ - - /* Provide the highest stack address to the user code (for stacks - which grow downwards). */ - pushq %rsp - -/************** - * START TODO */ -#if defined L_Scrt0 || defined L_Scrt1 - call .L0 -.L0: - popq %rbx - addq $_GLOBAL_OFFSET_TABLE_+[.-.L0],%rbx -#endif - -#if (defined L_crt1 || defined L_Scrt1) && defined __UCLIBC_CTOR_DTOR__ - /* Push .init and .fini arguments to __uClibc_start_main() on the stack */ -#ifdef L_Scrt1 - pushl _fini@GOT(%rip) - pushl _init@GOT(%rip) -#else - pushl $_fini - pushl $_init -#endif - - /* Push envp, argc, and argc arguments to __uClibc_start_main() on the stack */ -#if 0 - pushq %rdx /* Environment pointer */ - pushq %rsi /* Argument pointer */ - pushq %rdi /* And the argument count */ -#endif - - /* Ok, now run uClibc's main() -- shouldn't return */ -#ifdef L_Scrt1 - call *__uClibc_start_main@GOT(%rip) -#else - call __uClibc_start_main -#endif -#else - - /* Push envp, argc, and argc arguments to __uClibc_start_main() on the stack */ -#if 0 - pushq %rdx /* Environment pointer */ - pushq %rsi /* Argument pointer */ - pushq %rdi /* And the argument count */ -#endif - -#ifdef L_Scrt0 - call *__uClibc_main@GOT(%rip) -#else - call __uClibc_main -#endif -#endif -/* END TODO * - ************/ - - hlt /* Crash if somehow `exit' does return. */ -.size _start,.-_start - -/* 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 diff --git a/libc/sysdeps/linux/x86_64/crt1.S b/libc/sysdeps/linux/x86_64/crt1.S new file mode 100644 index 000000000..04cf691ef --- /dev/null +++ b/libc/sysdeps/linux/x86_64/crt1.S @@ -0,0 +1,144 @@ +/* Startup code compliant to the ELF x86-64 ABI. + Copyright (C) 2001, 2002, 2003, 2005 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Jaeger , 2001. + + 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. */ + +/* Originally based on glibc's sysdeps/x86_64/elf/start.S */ + +/* This is the canonical entry point, usually the first thing in the text + segment. The SVR4/i386 ABI (pages 3-31, 3-32) says that when the entry + point runs, most registers' values are unspecified, except for: + + %rdx 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. + + %rsp The stack contains the arguments and environment: + 0(%rsp) argc + 8(%rsp) argv[0] + ... + (8*argc)(%rsp) NULL + (8*(argc+1))(%rsp) envp[0] + ... + NULL +*/ + +#include + +.text +.global _start +.type _start,@function +#if defined(__UCLIBC_CTOR_DTOR__) +.type _init,@function +.type _fini,@function +#else +.weak _init +.weak _fini +#endif +.type __uClibc_main,@function +/* Stick in a dummy reference to main(), so that if an application + * is linking when the main() function is in a static library (.a) + * we can be sure that main() actually gets linked in */ +.type main,@function + +_start: + /* Clear the frame pointer. The ABI suggests this be done, to mark + the outermost frame obviously. */ + xorl %ebp, %ebp + + /* Extract the arguments as encoded on the stack and set up + the arguments for __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). + The arguments are passed via registers and on the stack: + main: %rdi + argc: %rsi + argv: %rdx + init: %rcx + fini: %r8 + rtld_fini: %r9 + stack_end: stack. */ + + movq %rdx, %r9 /* Address of the shared library termination function. */ + popq %rsi /* Pop the argument count. */ + movq %rsp, %rdx /* argv starts just at the current stack top. */ + movq %rsi, %rbx /* now we calc envp ... envp = argc */ + addq $8, %rbx + shl $0x3, %rbx /* envp *= 8 */ + addq %rdx, %rbx /* envp += argv */ + + /* Align the stack to a 16 byte boundary to follow the ABI. */ + andq $~15, %rsp + + pushq %rax /* Push garbage because we push 8 more bytes. */ + + /* Provide the highest stack address to the user code (for stacks + which grow downwards). */ + pushq %rsp + + /* Give address for main() */ + movq $main, %rdi + + /* setup init/fini address */ + movq $_init, %rcx + movq $_fini, %r8 + +/************** + * START TODO */ +#if defined(L_Scrt1) + call .L0 +.L0: + popq %rbx + addq $_GLOBAL_OFFSET_TABLE_+[.-.L0],%rbx + + call *__uClibc_main@GOT(%rip) +#else + call __uClibc_main +#endif +/* END TODO * + ************/ + + hlt /* Crash if somehow `exit' does return. */ +.size _start,.-_start + +/* 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 -- cgit v1.2.3