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+{
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+ This file is part of the Free Pascal run time library.
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+ Copyright (c) 2005 by Michael Van Canneyt, Peter Vreman,
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+ & Daniel Mantione, 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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+{
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+ Linux ELF startup code for Free Pascal
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+
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+
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+ Stack layout at program start:
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+
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+ nil
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+ envn
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+ ....
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+ .... ENVIRONMENT VARIABLES
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+ env1
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+ env0
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+ nil
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+ argn
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+ ....
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+ .... COMMAND LINE OPTIONS
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+ arg1
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+ arg0
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+ argc <--- esp
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+}
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+
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+var
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+ gmon_etext: longint; external name '_etext';
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+ gmon_start: longint; external name '_start';
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+ gmon_mcleanup: procedure; external name '_mcleanup';
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+ libc21_fpc_ret, libc21_fpc_ret_ebx: ptrint; { return address to libc }
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+ libc21_fpc_ret_esi, libc21_fpc_ret_edi: ptrint;
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+ gmon_monstarted: longint = 0;
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+
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+procedure gmon_monstartup; external name 'monstartup';
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+
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+procedure libc_atexit; external name '__libc_atexit';
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+procedure libc_exit; external name '__libc_exit';
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+procedure libc_init; external name '__libc_init';
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+procedure libc_setfpucw; external name '__setfpucw';
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+procedure libc_start_main; external name '__libc_start_main';
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+
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+procedure PASCALMAIN; external name 'PASCALMAIN';
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+
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+{******************************************************************************
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+ glibc 2.1 lib + profiling start/halt
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+ ******************************************************************************}
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+
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+procedure _FPC_libc21_gprof_gmon_start; assembler; nostackframe;
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+asm
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+ pushl %ebp
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+ movl gmon_monstarted,%eax
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+ leal 0x1(%eax),%edx
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+ movl %esp,%ebp
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+ movl %edx,gmon_monstarted
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+ testl %eax,%eax
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+ jnz .Lnomonstart
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+ pushl $gmon_etext { Initialize gmon }
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+ pushl $gmon_start
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+ call gmon_monstartup
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+ addl $8,%esp
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+ pushl $gmon_mcleanup
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+ call libc_atexit
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+ addl $4,%esp
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+.Lnomonstart:
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+ movl %ebp,%esp
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+ popl %ebp
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+ ret
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+end;
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+
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+procedure _FPC_libc21_gprof_start; assembler; nostackframe; public name '_start';
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+asm
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+ { First locate the start of the environment variables }
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+ popl %esi
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+ movl %eax,%edi
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+
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+ movl %esp,%ebx { Points to the arguments }
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+ movl %esi,%eax
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+ incl %eax
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+ shll $2,%eax
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+ addl %esp,%eax
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+ andl $0xfffffff8,%esp { Align stack }
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+
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+ movl %eax,operatingsystem_parameter_envp { Move the environment pointer }
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+ movl %esi,operatingsystem_parameter_argc { Move the argument counter }
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+ movl %ebx,operatingsystem_parameter_argv { Move the argument pointer }
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+
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+ movl %edi,%eax
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+ xorl %ebp,%ebp
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+ pushl %eax
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+ pushl %esp
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+ pushl %edx
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+ pushl $.Lfini_dummy
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+ pushl $.Linit_dummy
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+ pushl %ebx
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+ pushl %esi
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+ pushl $.Lcmain
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+ call libc_start_main
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+.Linit_dummy:
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+.Lfini_dummy:
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+ ret
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+
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+{ fake main routine which will be run from libc }
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+.Lcmain:
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+ { save return address }
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+ popl %eax
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+ movl %eax,libc21_fpc_ret
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+ movl %ebx,libc21_fpc_ret_ebx
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+ movl %esi,libc21_fpc_ret_esi
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+ movl %edi,libc21_fpc_ret_edi
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+ pushl %eax
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+
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+ call _FPC_libc21_gprof_gmon_start
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+
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+ { Save initial stackpointer }
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+ movl %esp,initialstkptr
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+
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+ { start the program }
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+ call PASCALMAIN
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+ hlt
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+end;
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+
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+procedure _FPC_libc21_gprof_haltproc; assembler; nostackframe; public name '_haltproc';
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+asm
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+ movzwl ExitCode,%eax
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+
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+ movl libc21_fpc_ret,%edx { return to libc }
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+ movl libc21_fpc_ret_ebx,%ebx
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+ movl libc21_fpc_ret_esi,%esi
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+ movl libc21_fpc_ret_edi,%edi
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+ push %edx
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+ ret
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+end;
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+
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