Emulation of a math function fails for m68k Linux user mode
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
QEMU |
Fix Released
|
Undecided
|
Laurent Vivier |
Bug Description
Please check the attached math-example.c file.
When running the m68k executable under QEMU, it results in an
"Illegal instruction" error.
Other targets don't produce this error.
Steps to reproduce the bug:
1. Download the math-example.c attached file.
2. Compile it by running:
m68k-
3. Run the executable with QEMU:
/build/
The output of execution is:
Profiling function expm1f():
qemu: uncaught target signal 4 (Illegal instruction) - core dumped
Illegal instruction (core dumped)
Output when running on other targets:
Profiling function expm1f():
Elapsed time: 47 ms
Control result: 71804.953125
Changed in qemu: | |
assignee: | nobody → Laurent Vivier (laurent-vivier) |
Changed in qemu: | |
status: | In Progress → Confirmed |
status: | Confirmed → In Progress |
Changed in qemu: | |
status: | In Progress → Fix Committed |
Tracing gives me:
IN: expm1f
0x800005cc: fetoxm1x %fp2,%fp0
Disassembler disagrees with translator over instruction decoding
Please report this to <email address hidden>
(gdb) x/2hx 0x800005cc
0x800005cc: 0xf200 0x0808
The instruction is not implemented in qemu. I fix that.