...well this is embarrassing - it was an issue with my code not
saving/restoring registers on the stack properly.
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https://bugs.launchpad.net/bugs/1192344
Title:
qemu crashes on unalig
Public bug reported:
When performing a BIOS extended disk read (INT 13H, AH=0x42), if the
offset of the buffer destination in the DAP (disk address packet) is not
dword-aligned (i.e. a multiple of 4), SeaBIOS attempts to execute code
at non-mapped address 0xb4f53, causing QEMU to crash. I imagine
