Jonathan Campbell
cbe963bc81
If a DOS program shrinks it's own PSP segment down, corrupts the MCB block following it, and them does anything that causes allocation, follow apparent MS-DOS behavior by writing a new free MCB block following the PSP segment instead of crashing the emulation with an MCB chain corruption error.
2025-10-06 00:23:19 -07:00
Jonathan Campbell
d7a4a3131c
retab
2025-10-05 23:04:44 -07:00
Allofich
7a36a678d4
Make applicable changes from SVN
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From r4485, r4487, r4488 and r4490
2025-08-24 01:24:46 +09:00
Jonathan Campbell
cf7ed0d9dd
Allow dos mem limit to direct DOS kernel allocation, the same as memsizekb, so you can have 640KB of RAM but cram DOS into the first 4KB for example
2025-03-13 23:28:04 -07:00
Jonathan Campbell
78b7bb5a01
Put the default INT 3 vector routine well within IHSEG where it cannot cause any more trouble
2024-08-01 18:20:34 -07:00
Jonathan Campbell
1544a71ddb
IRET for INT 3 was accidentally placed in the same memory location as the fake SFT, move the IRET
2024-06-02 18:50:53 -07:00
Jonathan Campbell
641c69600a
INT 21h: Add option whether to assign MCB ownership or return an error if a DOS program attempts to resize a freed memory block. Fix DOS resize to assign ownership even if the MCB is already the size requested to resize to.
2024-04-16 12:39:17 -07:00
Wengier
365439d544
more
2022-08-20 18:30:29 -04:00
Jonathan Campbell
20e02a33a0
Add dosbox.conf option to enable clearing TF on INT 01h
2022-06-30 16:06:35 -07:00
Jonathan Campbell
40ca58e08e
DOS kernel: Modify INT 01 handler to clear trap flag before return so that errant programs that accidentally set the TF (trap flag) without their own interrupt handler for it can work flawlessly. Needed for 1996 demo Dyslexia by Threesome when Sound Blaster is selected. See comments for details
2022-06-30 15:55:33 -07:00
Allofich
a86a5d9300
Fix infinite loop with 32-bit program and 8086
2021-11-28 22:32:13 +09:00
Cimarron Mittelsteadt
38f7b86b25
Fix to avoid windows compile conflict with std::max and internal macro
2021-07-22 08:07:10 -07:00
Cimarron Mittelsteadt
c3f5637e0e
Fix with how DOS_Execute allocates memory to comply with the memory allocation strategy for UMB...now, it will allocate and execute in UMB if there is enough memory for the minimum allocation of the executable
2021-07-21 19:13:20 -07:00
Allofich
c2b17e40ed
Localize #include "logging.h" from dosbox.h
2021-06-09 11:11:03 +09:00
Allofich
5bc397e6dd
Remove redundant casts, parentheses, and break
2021-05-15 00:11:12 +09:00
Jonathan Campbell
54f5f10494
PCjr: If memsize is 128KB or less, subtract 16KB from total memory at BIOS level, omit reserved graphics memory MCB block at the DOS level. Otherwise, report total memory and insert reserved MCB block as if PCjr with a sidecar that adds memory, which is also DOSBox SVN default and its only behavior
2021-03-24 14:23:03 -07:00
Jonathan Campbell
a1685c7120
PCjr: Remove minimum 256KB check, allow setting as low as 64KB, although the DOS kernel still requires 128KB minimum. Fix DOS kernel not to create MCB block past video RAM at top of 128KB if memsize is 128KB. This change makes it possible to run Mickeys Space Adventure in PCjr mode if you set memsize=0 and memsizekb=128. Note the game will corrupt itself if memsize=144 to memsize=256 and will not display anything if memsize=640 which is equivalent to DOSBox SVN PCjr emulation
2021-03-23 20:05:59 -07:00
Jonathan Campbell
07bb0e6b9b
Tandy mode: Instead of fixing the 128KB region at 8000:0000, select the 128KB region according to the amount of conventional memory. Remove 384KB minimum E_Exit check, allow down to 64KB but warn if below 256KB.
2021-03-23 19:46:50 -07:00
Jonathan Campbell
88a99c1226
Update Tandy emulation vs memsizekb setting, add FIXME reminders, etc
2021-03-22 23:22:52 -07:00
Allofich
9294d450ec
SVN r4412
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Update copyright.
2021-03-06 21:18:08 +09:00
Emmanuel Gil Peyrot
a431d81213
Replace Bit16u with uint16_t
2020-09-28 17:14:35 +02:00
Emmanuel Gil Peyrot
35f38f3ebe
Replace Bit8u with uint8_t
2020-09-28 17:14:35 +02:00
Wengier
b447cce3a0
more
2020-08-25 22:13:06 -04:00
rderooy
6c0d02201d
Update (c) year and FSF address
2020-06-25 09:25:24 +02:00
Wengier
4ebfc59c0d
save state etc
2020-06-03 21:46:48 -04:00
Allofich
46e6fc20b1
Type-conversion warning fixes
2019-06-29 22:51:44 +09:00
Allofich
57d8f8e59a
SVN r4218
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Use a more compatible offset for DOS redirected interrupt vector. Works
around a null pointer bug in the notes dropdown list of Jack the Ripper.
2019-06-11 21:53:29 +09:00
Allofich
d84a812743
SVN r4183 (second half)
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Update year
2019-06-03 23:01:41 +09:00
Allofich
05619dd023
SVN r4183 (first half)
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Update address of FSF
2019-06-03 22:54:46 +09:00
Allofich
fb067a7331
SVN r4164
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Remove 128k PCjr faking from r2417 that was effectively disabled by
r3420.
2019-06-02 18:17:25 +09:00
Allofich
3ee77b9f49
SVN r4063
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Remove some unnecessary things from prior commits
2019-05-21 23:25:01 +09:00
Allofich
bab71f6f33
SVN r4046
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Point DOS redirected interrupts at a plain IRET as in real DOS. Prevents
erroneous detection of an active debugger, which for example fixes sound
in Microleague Football 2.
(Note: The fix for Microleague Football 2 was already handled in
DOSBox-X through an on-by-default option, but this commit adds the
missing parts of this SVN commit)
2019-05-19 17:22:12 +09:00
Allofich
575ba6749d
SVN r3895 (partial)
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Coalesce free memory blocks before resizing a block in case it grows; coalesce after resizing only if the block shrinks.
2019-04-30 15:38:09 +09:00
Jonathan Campbell
f459a42639
fix freetype vcxproj
2019-04-02 20:48:10 -07:00
Jonathan Campbell
2f5ca954c4
more
2019-03-31 01:21:40 -07:00
Jonathan Campbell
3810ea5086
compiler warning fixes
2018-12-23 20:18:32 -08:00
Jonathan Campbell
066e80f599
DOS: XMS setup initializes the proper size for UMB region, do not re-initialize again. This fixes problems in PC-98 mode where booting a guest OS unmaps the UMB region AND the PC-98 SOUND ROM BIOS (overlap)
2018-11-18 07:22:57 -08:00
Jonathan Campbell
297d120f86
change default again, comment on what needs to be done for the dummy MCB to work
2018-06-21 07:29:21 -07:00
Jonathan Campbell
d80ee65e3a
remove loadfix padding and dummy environ block options
2018-06-21 07:22:14 -07:00
Jonathan Campbell
74489724f9
Wtype convert
2018-06-01 11:44:29 -07:00
James Ye
98f3783f75
Fix potential format string vulnerabilities
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This allows compiling with `-Werror=format-security', which is required
for packaging in many GNU/Linux distributions.
See https://en.wikipedia.org/wiki/Uncontrolled_format_string for more
information.
2018-03-21 10:19:46 +11:00
Jonathan Campbell
fe92051abc
DOS: A corrupt MCB chain should trigger the debugger and a restart of the DOS kernel, rather than aborting the emulator, if the debugger is available
2018-03-15 09:35:33 -07:00
Jonathan Campbell
e0c7bcb39d
UMB: Use the actual EMS page frame, don't assume 0xE000.
2017-12-24 13:05:09 -08:00
Jonathan Campbell
324261df1f
DOS unsetup memory
2017-04-01 13:24:59 -07:00
Jonathan Campbell
94c2345b27
convert some LOG_MSG()s to LOG(..,..) for logging cleanup. demote some
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log entries to debug level.
2015-12-28 16:24:35 -08:00
Jonathan Campbell
ee467a1151
bugfix: new option (default true) that points INT 1 and INT 3 directly
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at the IRETF instruction to appease paranoid DOS games and demos. If INT
1 or 3 point to anything other than IRET some games/demos think they are
being debugged and will bail out. Bugfix for "Digital Dreams" demo.
2015-04-03 13:25:38 -07:00
Jonathan Campbell
ad5f9e456f
bugfix: if you can't allocate the EMS system handle, then don't enable
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VCPI, the handle memory location is invalid. This fixes memory
corruption within realmode segment 0x1E8-0x507 when memsize=1.
2015-03-23 06:41:37 -07:00
Jonathan Campbell
cbc0b743dc
fix UMB mapping for EMS and PCjr cases. don't assume 64KB.
2015-02-15 23:15:12 -08:00
Jonathan Campbell
1ea24c81ee
allow user to remove some "padding" and "fake" MCBs from the base of
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conventional memory.
2015-02-15 21:29:27 -08:00
Jonathan Campbell
da3104d10d
prepare MCB setup for some work
2015-02-15 21:07:13 -08:00
