github-mirrors/cve2
1
0
Fork 0
mirror of https://github.com/openhwgroup/cve2.git synced 2025-04-24 14:09:08 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

[rtl] Ignore LSB only for writes to dpc

Browse source 
Without this commit, writes to `dpc` with the LSB set are completely
ignored. This commit changes the implementation to ignore the LSB only.
This is the same behavior as seen required for `mepc`. This resolves
lowRISC/ibex#444.

Signed-off-by: Pirmin Vogel <vogelpi@lowrisc.org>
This commit is contained in:
Pirmin Vogel 2019-11-12 18:18:34 +01:00
parent 9b390c5d4e
commit d538261c78
1 changed files with 2 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

8
rtl/ibex_cs_registers.sv
View file

@ -459,12 +459,8 @@ module ibex_cs_registers #(
dcsr_d.zero2 = 12'h0;
end
CSR_DPC: begin
// Only valid PC addresses are allowed (half-word aligned with C ext.)
if (csr_wdata_int[0] == 1'b0) begin
depc_d = csr_wdata_int;
end
end
// dpc: debug program counter
CSR_DPC: depc_d = {csr_wdata_int[31:1], 1'b0};
CSR_DSCRATCH0: dscratch0_d = csr_wdata_int;
CSR_DSCRATCH1: dscratch1_d = csr_wdata_int;