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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