From b42f56c555c48d1040808099321d8dd634187cd6 Mon Sep 17 00:00:00 2001 From: Andreas Jaeger Date: Tue, 1 Feb 2000 08:28:15 +0000 Subject: [PATCH] 2000-02-01 Andreas Jaeger * sysdeps/mips/elf/start.S: Rewritten for __libc_start_main. --- sysdeps/mips/elf/start.S | 107 ++++++++++++----------------------------------- 1 file changed, 26 insertions(+), 81 deletions(-) diff --git a/sysdeps/mips/elf/start.S b/sysdeps/mips/elf/start.S index ce9ad9c..b432953 100644 --- a/sysdeps/mips/elf/start.S +++ b/sysdeps/mips/elf/start.S @@ -1,5 +1,5 @@ /* Startup code compliant to the ELF Mips ABI. - Copyright (C) 1995, 1997 Free Software Foundation, Inc. + Copyright (C) 1995, 1997, 2000 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 @@ -45,6 +45,12 @@ 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) +*/ #ifdef PIC /* A macro to (re)initialize gp. We can get the run time address of 0f in ra ($31) by blezal instruction. In this early phase, we can't save gp @@ -66,84 +72,28 @@ ENTRY_POINT: #endif move $31, $0 - /* $2 contains the address of the shared library termination - function, which we will register with `atexit' to be called by - `exit'. I suspect that on some systems, and when statically - linked, this will not be set by anything to any function - pointer; hopefully it will be zero so we don't try to call - random pointers. */ - beq $2, $0, nofini - move $4, $2 - jal atexit -#ifdef PIC - SET_GP -#endif -nofini: - - /* Do essential libc initialization. In statically linked - programs under the GNU Hurd, this is what sets up the - arguments on the stack for the code below. Since the argument - registers (a0 - a3) saved to the first 4 stack entries by - the prologue of __libc_init_first, we preload them to - prevent clobbering the stack tops. In Hurd case, stack pointer - ($29) may be VM_MAX_ADDRESS here. If so, we must modify it. */ -#if 0 - jal mach_host_self -#endif - li $4, 0x80000000 - bne $29, $4, 1f - subu $29, 16 - sw $0, 0($29) - sw $0, 4($29) - sw $0, 8($29) - sw $0, 12($29) -1: - lw $4, 0($29) - lw $5, 4($29) - lw $6, 8($29) - lw $7, 12($29) - jal __libc_init_first -#ifdef PIC - SET_GP -#endif - lw $4, 0($29) - lw $5, 4($29) - lw $6, 8($29) - lw $7, 12($29) - - /* Call `_init', which is the entry point to our own `.init' - section; and register with `atexit' to have `exit' call - `_fini', which is the entry point to our own `.fini' section. */ - jal _init -#ifdef PIC - SET_GP -#endif #if (__mips64) - dla $4, _fini -#else /* __mips64 */ - la $4, _fini -#endif /* __mips64 */ - - jal atexit -#ifdef PIC - SET_GP + dla $4, main /* main */ + lw $5, 0($29) /* argc */ + addu $6, $29, 4 /* argv */ + /* Allocate space on the stack for seven arguments but align to 32. */ + subu $29, 32 + dla $7, _init /* init */ + dla $8, _fini +#else + la $4, main /* main */ + lw $5, 0($29) /* argc */ + addu $6, $29, 4 /* argv */ + /* Allocate space on the stack for seven arguments but align to 32. */ + subu $29, 32 + la $7, _init /* init */ + la $8, _fini #endif + sw $8, 16($29) /* fini */ + sw $2, 20($29) /* rtld_fini */ + sw $29, 24($29) /* stack_end */ + jal __libc_start_main - /* Extract the arguments and environment as encoded on the stack - and set up the arguments for `main': argc, argv, envp. */ - lw $4, 0($29) /* argc */ - addu $5, $29, 4 /* argv */ - sll $6, $4, 2 - addu $6, $6, 4 - addu $6, $5, $6 /* envp = &argv[argc + 1] */ - - /* Call the user's main function, and exit with its value. */ - jal main -#ifdef PIC - SET_GP -#endif - move $4, $2 - jal exit /* This should never return. */ hlt: b hlt /* Crash if somehow it does return. */ /* Define a symbol for the first piece of initialized data. */ @@ -153,8 +103,3 @@ __data_start: .long 0 .weak data_start data_start = __data_start - - .comm errno, 4, 4 -#ifdef __ELF__ - .type errno, @object -#endif -- 2.7.4