diff options
Diffstat (limited to 'gitlab/issues_text/target_riscv/host_missing/accel_missing/2655')
| -rw-r--r-- | gitlab/issues_text/target_riscv/host_missing/accel_missing/2655 | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/gitlab/issues_text/target_riscv/host_missing/accel_missing/2655 b/gitlab/issues_text/target_riscv/host_missing/accel_missing/2655 deleted file mode 100644 index f23243e21..000000000 --- a/gitlab/issues_text/target_riscv/host_missing/accel_missing/2655 +++ /dev/null @@ -1,39 +0,0 @@ -A problem in target/riscv/vector_helper.c: vext_ldff() -Description of problem: -I‘m confused about a behavior in function vext_ldff() in target/riscv/vector_helper.c: -``` -static inline void -vext_ldff(...) -{ -... - for (i = env->vstart; i < env->vl; i++) { -... - if (i == 0) { - probe_pages(env, addr, nf << log2_esz, ra, MMU_DATA_LOAD); - } else { -... - flags = probe_access_flags(env, addr, offset, MMU_DATA_LOAD, - mmu_index, true, &host, 0); -... - if (flags & ~TLB_WATCHPOINT) { - vl = i; - goto ProbeSuccess; - } -... - } - } -ProbeSuccess: -... -} -``` -If the current instruction has a memory callback by plugin, the function probe_access_flags() will return TLB_MMIO when the page is exist. - -In this case, the function will always set vl to 1, goto ProbeSuccess, and only load the first element. Does it meet expectations? - -This problem occurred in both linux-user mode and full-system mode. - -Maybe we can add extra parameter to probe_access_flags(), in order to change the behavior of inner functions. -Steps to reproduce: -1. Make a binary with instruction vle(x)ff.v, what I am using is https://github.com/chipsalliance/riscv-vector-tests. -2. Write a plugin to add memory callbacks. -3. Observe the behavior of the function. |