10 commits

Author	SHA1	Message	Date
tkchia	f8a6f92752	plat/msdos386: fix: RM int 0x21 calls was clobbering high halves ... of esi and edi registers	2022-08-26 17:32:50 +00:00
tkchia	249e4b9069	plat/msdos386: fix a few more issues with startup and stub code ... - correctly calculate size of BSS area to clear - make realloc routine set both ds & es to point to new data segment - correctly initialize real mode flags when simulating real mode interrupt via DPMI - other minor fixes	2022-08-24 10:17:15 +00:00
tkchia	95ed8ee484	plat/msdos386: fix startup code so that it works under dosemu2 ... - do not try to store data through code segment selectors - set each segment limit to segment size - 1, not segment size - get PSP segment while still in real/V86 mode (DPMI host might choose to return PM selector for int 0x21, ah = 0x62) - other minor fixes	2022-08-23 14:35:43 +00:00
David Given	dc1f69be83	Most of read and write now works; filename-based operations partially work; but ... there's a nasty memory corruption somewhere which needs investigating.	2022-08-19 00:08:57 +02:00
David Given	5329c98b81	Simplify and fix reading and writing so they seem to work.	2022-08-18 21:21:33 +02:00
David Given	cc356b5c75	Programs now start up and can write to the console, but crash when reading.	2022-08-18 00:24:08 +02:00
David Given	48398b072a	write() system calls work; start going through the libsys.	2022-08-17 22:34:06 +02:00
David Given	1764c6baa2	Made realloc work; the 32-bit process can now be resized to include bss and ... stack.	2022-08-10 16:14:12 +02:00
David Given	d464606dd6	We can now load and run 32-bit protected-mode executables. We have not, ... however, set up the data segment.	2022-08-09 23:49:18 +02:00
David Given	b48b5b13ce	Maybe have a working stub now.	2022-08-09 23:32:41 +02:00