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target/hppa: Work-around for Fast TLB insert instruction on HP-UX 9

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The HP-UX 9 kernel uses two TLB insert instructions (0x05315440 and
0x05385400), which seem to be wrongly encoded fast TLB instructions, but
similiar to the non-fast instructions idtlba r17,(r9) and
idtlbp r24,(r9).

It's not clear, if those undocumented instructions were used by mistake,
or intentionally. Either way, this patch allows qemu to handle those
instructions, so that a HP-UX 9 boot-CD can now boot somewhat further (but
still crashes due to other reasons afterwards).

Signed-off-by: Helge Deller <deller@gmx.de>
Suggested-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Helge Deller
2026-07-03 00:32:35 +02:00
parent 7f2007d192
commit 23dcccfe8a
1 changed files with 2 additions and 0 deletions
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2
target/hppa/insns.decode
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@@ -164,6 +164,8 @@ ixtlbx 000001 b:5 r:5 ... 000000 addr:1 0 00000 \
# pcxl and pcxl2 Fast TLB Insert instructions
ixtlbxf 000001 00000 r:5 00 0 data:1 01000 addr:1 0 00000
# workaround for non-standard encoding as used in HP-UX 9
ixtlbxf 000001 01001 r:5 01 0 data:1 01000 addr:1 0 00000
# pa2.0 tlb insert idtlbt and iitlbt instructions
ixtlbt 000001 r2:5 r1:5 000 data:1 100000 0 00000 # idtlbt