The `pcount_enable` function can be used to selectively enable
performance counters only for a specific code segment. For example:
```c
pcount_enable(0);
pcount_reset();
pcount_enable(1);
/* code to be measured */
pcount_enable(0);
```
The `pcount_enable` function consists of a single CSR instruction, so
the overhead and thus the impact on the measurement is potentially low.
When the function is called, however, many instructions have to be
executed in addition to the single CSR instruction, which influences
measurements.
This commit moves the `pcount_enable` function to the
`simple_system_common.h` header file and declares it as `inline` (and
`static`, to prevent link-time collisions when the header file is
included in multiple compilation units). This helps the compiler inline
the function even without LTO.
Signed-off-by: Andreas Kurth <adk@lowrisc.org>
This commit updates link.ld RAM length to include max BRAM capacity
for Arty A7-35. It also changes coremark makefile to include a .vmem
output, which then can be used for FPGA implementations.
Signed-off-by: Canberk Topal <ctopal@lowrisc.org>
This invocation would break:
make -C examples/sw/led/ CC=/opt/lowrisc-toolchain-gcc-rv32imc-20210412-1/bin/riscv32-unknown-elf-gcc
because the "-gcc" occurence inside the directory name would also be replaced.
Fix by first deriving CROSS_COMPILE from CC, then conditionally build other tool file names/paths.
Signed-off-by: Leon Woestenberg <leon@sidebranch.com>
Anyone who needs to disassemble their generated ELF can probably just
call objdump directly and the precise set of flags have already
confused at least one potential contributor[1].
We're keeping the canned objdump command for "engineers that know
where to look" because some have said they find it useful. Run it with
e.g.
make -C examples/sw/simple_system/hello_test disassemble
[1] https://github.com/lowRISC/ibex/issues/1263
Adding the "small" sections to the example linker script. This ensures
that all sections of memory needing to be zeroed are captured.
Fixes#1092
Signed-off-by: Tom Roberts <tomroberts@lowrisc.org>
At some point in the future, the version of binutils we're using, and
the released version of LLVM, will coincide to use the correct name. In
the meantime, this change just uses the number which is supported by
both compilers.
This is, as I understand it, the only stumbling block to compiling the
in-repo C benchmark code with both GCC and LLVM. Being able to do so
would make it much easier for us to do comparisons on the benchmarks for
both compilers.
Signed-off-by: Sam Elliott <selliott@lowrisc.org>
This is part of work to run binaries created for the simple system
under Spike. Spike's default behaviour (after a weird 'rom' trampoline
at 0x1000) is to obey the entry point given in the ELF file. So let's
set it correctly.
Simple system is a basic verilator top-level testbench for running
executables. It has functionality for outputting text to a log file
and for the software to terminate the simulation
