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[/] [forwardcom/] [libraries/] [startup.as] - Rev 116
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/********************************* startup.as *******************************
* Author: Agner Fog
* date created: 2018-03-22
* Last modified: 2018-03-22
* Version: 1.00
* Project: ForwardCom library libc.li
* Description: startup: program initialization
* C declaration: void _entry_point(int argc, char *argv[], char *envp[])
*
* This is the default startup code for ForwardCom programs.
* It will be linked into a program if there is no definition of __entry_point elsewhere.
* It will do the following:
* 1. call any constructor event handlers
* 2. call _main
* 3. call any destructor event handlers
* 4. exit with the return code from _main
*
* Copyright 2018 GNU General Public License http://www.gnu.org/licenses
*****************************************************************************/
// define event IDs
%EVT_CONSTRUCT = 1 // call static constructors and initialization procedures before calling main
%EVT_DESTRUCT = 2 // call static destructors and clean up after return from main
code section execute align = 4
extern _main: function reguse = 0xFFFFFFFF,0xFFFFFFFF
extern _raise_event: function
// execution starts here:
__entry_point function public reguse = 0xFFFFFFFF,0xFFFFFFFF
// parameters to main: int argc, char *argv[], char *envp[]
int64 r16 = r0
int64 r17 = r1
int64 r18 = r2
// call any constructors before main
int64 r0 = EVT_CONSTRUCT << 32 // constructor event
call _raise_event // call event handlers for constructors
// restore the parameters to main
int64 r0 = r16
int64 r1 = r17
int64 r2 = r18
// call main, the user program
call _main
int64 r16 = r0 // save the return value
// call destructors after main
int64 r0 = EVT_DESTRUCT << 32 // destructor event
call _raise_event // call event handlers for destructors
int64 r0 = r16 // return value from main to the operating system
sys_call(1, 0x10) // system call exit
filler // make sure execution stops if the system call returns for some reason
__entry_point end
code end
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