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DP_01_003 - GDB Simulator - Add Zc support
DP_01_003 - GDB Simulator - Add Zc support
About
During an evaluation of the GDB test suite on RISC-V, it was discovered that the GDB Simulator (used by the GDB test suite) only supports RV64G and RV32G models.
This work will add support for the C extension (compressed instructions, Zc), allowing for RV64GC and RV32GC models to be selected and ran. This is important because many of the C libraries that can be used when building GDB make use of Zc instructions. (Also CSR instructions are not properly handled).
Status
Updates
- Reported commencement of development effort
- The scope of this task has increased to include support for single and double precision floating point and to provide some semihosting facilities
- With these additions, it is anticipated that the GDB test suite will have 100% successful coverage on RISC-V
- This takes us into early Q4 (end of October)
- Initial patches submitted upstream
- Marking as completed
- Zc support merged to master in https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=3224e32fb84f034d190ad91d7b9ac86f6800d47a
- Additional patches for F and D simulation submitted at https://sourceware.org/pipermail/gdb-patches/2024-February/206827.html