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74 lines
2.1 KiB
ActionScript
74 lines
2.1 KiB
ActionScript
#
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# $Id$
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# This file is part of the Free Pascal run time library.
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# Copyright (c) 2002 by Florian Klaempfl
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# members of the Free Pascal development team.
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#
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# See the file COPYING.FPC, included in this distribution,
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# for details about the copyright.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY;without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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#
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#**********************************************************************}
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#
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# Linux ELF startup code for Free Pascal
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#
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/* This is the canonical entry point, usually the first thing in the text
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segment. The SVR4/i386 ABI (pages 3-31, 3-32) says that when the entry
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point runs, most registers' values are unspecified, except for:
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%rdx Contains a function pointer to be registered with `atexit'.
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This is how the dynamic linker arranges to have DT_FINI
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functions called for shared libraries that have been loaded
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before this code runs.
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%rsp The stack contains the arguments and environment:
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0(%rsp) argc
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8(%rsp) argv[0]
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...
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(8*argc)(%rsp) NULL
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(8*(argc+1))(%rsp) envp[0]
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...
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NULL
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*/
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.text
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.globl _start
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.type _start,@function
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_start:
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# movq %rdx,%r9 /* Address of the shared library termination
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# function. */
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popq %rsi /* Pop the argument count. */
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movq %rsi,U_SYSTEM_ARGC
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movq %rsp,U_SYSTEM_ARGV /* argv starts just at the current stack top. */
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leaq 8(%rsi,,8),%rax
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addq %esp,%rax
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movq %rax,U_SYSTEM_ENVP
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andq $~15,%rsp /* Align the stack to a 16 byte boundary to follow the ABI. */
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/* !!!! CPU initialization? */
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xorq %rbp, %rbp
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call PASCALMAIN
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hlt /* Crash if somehow `exit' does return. */
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/*!!!! hlt syscall? */
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/* Define a symbol for the first piece of initialized data. */
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.data
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.globl __data_start
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__data_start:
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.long 0
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.weak data_start
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data_start = __data_start
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#
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# $Log$
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# Revision 1.1 2003-01-06 19:33:10 florian
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# + initial revision
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#
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#
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