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[/] [forwardcom/] [libraries/] [startup.as] - Blame information for rev 157

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1 112 Agner
/*********************************  startup.as  *******************************
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* Author:        Agner Fog
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* date created:  2018-03-22
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* Last modified: 2018-03-22
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* Version:       1.00
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* Project:       ForwardCom library libc.li
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* Description:   startup: program initialization
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* C declaration: void _entry_point(int argc, char *argv[], char *envp[])
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*
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* This is the default startup code for ForwardCom programs.
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* It will be linked into a program if there is no definition of __entry_point elsewhere.
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* It will do the following:
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* 1. call any constructor event handlers
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* 2. call _main
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* 3. call any destructor event handlers
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* 4. exit with the return code from _main
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*
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* Copyright 2018 GNU General Public License http://www.gnu.org/licenses
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*****************************************************************************/
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// define event IDs
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%EVT_CONSTRUCT = 1           // call static constructors and initialization procedures before calling main
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%EVT_DESTRUCT  = 2           // call static destructors and clean up after return from main
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code section execute align = 4
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extern _main: function reguse = 0xFFFFFFFF,0xFFFFFFFF
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extern _raise_event: function
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// execution starts here:
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__entry_point function public reguse = 0xFFFFFFFF,0xFFFFFFFF
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// parameters to main: int argc, char *argv[], char *envp[]
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int64 r16 = r0
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int64 r17 = r1
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int64 r18 = r2
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// call any constructors before main
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int64 r0 = EVT_CONSTRUCT << 32                   // constructor event
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call _raise_event                                // call event handlers for constructors
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// restore the parameters to main
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int64 r0 = r16
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int64 r1 = r17
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int64 r2 = r18
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// call main, the user program
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call _main
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int64 r16 = r0                                   // save the return value
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// call destructors after main
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int64 r0 = EVT_DESTRUCT << 32                    // destructor event
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call _raise_event                                // call event handlers for destructors
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int64 r0 = r16                                   // return value from main to the operating system
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sys_call(1, 0x10)                                // system call exit
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filler                                           // make sure execution stops if the system call returns for some reason
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__entry_point end
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code end

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