| Commit message (Collapse) | Author | Age |
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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This allows to easier identify unused pipeline stages.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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When instructions are visualized then it is even more
misleading to keep old instruction in decode phase delay buffer.
The single cycle core with delay slot is upgraded
to the variant with fetch and execute phases.
This way the structure is logical and delay slot
has purpose.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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The word index (column) has been erroneously used
for set index value.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Ubuntu Trusty.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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library changes.
I have not found a way how to pass additional CONFIG options
to Debian package build (dpkg-buildpackage) when qmake is invoked from
debian/rules with debian helper based (dh) build.
The way how qmake solves dependencies between program and libraries
comes from stone age. It is necessary to include complete path
to the library in PRE_TARGETDEPS definition including lib prefix
and .a suffix. This is non portable and cannot be easily used
when static and dynamic libraries build alternatives are considered.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Problem reported by Jakub Broz.
Correct behaviour according to
MIPS Architecture for Programmers Volume II-A:
The MIPS32 Instruction Set Manual
which describes DIV instruction
Format: DIV rs, rt
No arithmetic exception occurs under any circumstances.
Restrictions:
If the divisor in GPR rt is zero, the arithmetic result value
is UNPREDICTABLE.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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option.
When operating system emulation root directory (fs_root) are selected
then open() syscall opens real host system files in this limited
subtree. When fs_root is not set then console is mapped to all
read, write, open and close calls.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Some instructions can have fields to be used by operating system
or for error reporting by user.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Instructions description in instruction.cpp has been
pragmatically augmented by tool based on Python MIPS simulator,
hazards analyzer
https://github.com/ppisa/apo-simarch
That code has been originally distilled from from GNU
binutils sources.
Implementation is now inline with my original proposal
Previous solution gets untenable with more complex
instructions and its complexity would grow extremely.
MIPS instruction set with coprocessor instructions
which use sel field, rd used as index, rt as destination
and other peculiarities in newer versions cannot
be processed based on basic CPU control signals.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Jump to address 0x8000180 by default and to EBase + 0x180
when EBase is set to be compatible with real MIPS CPU.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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exception.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Simple polled mode serial port input implemented for
serial port peripheral and for read and readv system
calls. When end of input character reserve is reached
for read/readv, newline is automatically appended.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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to SPIM.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Still Tx only and keep 0xffffc000 base to allows single
instruction LW and SW access.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Setting bits 16 to 31 to 1 is incorrect, offset is shift
by two so bit 16 can be zero for jumps in range -64k to -128k.
Adjust relative offsets to compute target address same, as if there
is delay slot, for CPU variant without delay slot.
This allows to use same/standard MIPS assembler for mode
without delay slots.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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This allows simple visual compare of rs and rt in execution stage
with register number to be written in memory and write-back stages.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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The reference data has been obtained by running application
under userspace MIPS QEMU.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Add into cache statistic number of backing/main memory accesses.
Correction of meaning and computation of the cache statistic.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Windows builds.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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This type of the hazard doe not cause problems in the simulator
because processing of memory stage is already finished
at time when PC handling is started but it would cause
problems in real hardware where PC handling is processed
in parallel to memory load.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Decode dt_d represents next input to execute stage
not state of decode stage at this moment.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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This allows to use MUSL Lib C printf and scanf implementations.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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instructions.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed value caused in the conversion incorrect behavior
for some corner cases.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
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