URL
https://opencores.org/ocsvn/forwardcom/forwardcom/trunk
Subversion Repositories forwardcom
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- This comparison shows the changes necessary to convert path
/forwardcom
- from Rev 111 to Rev 112
- ↔ Reverse comparison
Rev 111 → Rev 112
/libraries/startup.as
0,0 → 1,61
/********************************* 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 |
*****************************************************************************/ |
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// 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 |
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code section execute align = 4 |
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extern _main: function reguse = 0xFFFFFFFF,0xFFFFFFFF |
extern _raise_event: function |
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// execution starts here: |
__entry_point function public reguse = 0xFFFFFFFF,0xFFFFFFFF |
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// parameters to main: int argc, char *argv[], char *envp[] |
int64 r16 = r0 |
int64 r17 = r1 |
int64 r18 = r2 |
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// call any constructors before main |
int64 r0 = EVT_CONSTRUCT << 32 // constructor event |
call _raise_event // call event handlers for constructors |
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// restore the parameters to main |
int64 r0 = r16 |
int64 r1 = r17 |
int64 r2 = r18 |
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// call main, the user program |
call _main |
int64 r16 = r0 // save the return value |
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// call destructors after main |
int64 r0 = EVT_DESTRUCT << 32 // destructor event |
call _raise_event // call event handlers for destructors |
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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 |
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__entry_point end |
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code end |