Blake3 syscall (#17358)

programs/bpf_loader/src/syscalls.rs

@@ -13,15 +13,15 @@ use solana_sdk::{
     account::{Account, AccountSharedData, ReadableAccount},
     account_info::AccountInfo,
     account_utils::StateMut,
-    bpf_loader, bpf_loader_deprecated,
+    blake3, bpf_loader, bpf_loader_deprecated,
     bpf_loader_upgradeable::{self, UpgradeableLoaderState},
     clock::Clock,
     entrypoint::{MAX_PERMITTED_DATA_INCREASE, SUCCESS},
     epoch_schedule::EpochSchedule,
     feature_set::{
-        cpi_data_cost, demote_sysvar_write_locks, enforce_aligned_host_addrs,
-        keccak256_syscall_enabled, memory_ops_syscalls, set_upgrade_authority_via_cpi_enabled,
-        sysvar_via_syscall, update_data_on_realloc,
+        blake3_syscall_enabled, cpi_data_cost, demote_sysvar_write_locks,
+        enforce_aligned_host_addrs, keccak256_syscall_enabled, memory_ops_syscalls,
+        set_upgrade_authority_via_cpi_enabled, sysvar_via_syscall, update_data_on_realloc,
     },
     hash::{Hasher, HASH_BYTES},
     ic_msg,
@@ -134,6 +134,10 @@ pub fn register_syscalls(
         syscall_registry.register_syscall_by_name(b"sol_keccak256", SyscallKeccak256::call)?;
     }
 
+    if invoke_context.is_feature_active(&blake3_syscall_enabled::id()) {
+        syscall_registry.register_syscall_by_name(b"sol_blake3", SyscallBlake3::call)?;
+    }
+
     if invoke_context.is_feature_active(&sysvar_via_syscall::id()) {
         syscall_registry
             .register_syscall_by_name(b"sol_get_clock_sysvar", SyscallGetClockSysvar::call)?;
@@ -316,6 +320,16 @@ pub fn bind_syscall_context_objects<'a>(
             loader_id,
         }),
     );
+    bind_feature_gated_syscall_context_object!(
+        vm,
+        invoke_context.is_feature_active(&blake3_syscall_enabled::id()),
+        Box::new(SyscallBlake3 {
+            base_cost: bpf_compute_budget.sha256_base_cost,
+            byte_cost: bpf_compute_budget.sha256_byte_cost,
+            compute_meter: invoke_context.get_compute_meter(),
+            loader_id,
+        }),
+    );
 
     let is_sysvar_via_syscall_active = invoke_context.is_feature_active(&sysvar_via_syscall::id());
 
@@ -1329,6 +1343,65 @@ impl<'a> SyscallObject<BpfError> for SyscallMemset<'a> {
     }
 }
 
+// Blake3
+pub struct SyscallBlake3<'a> {
+    base_cost: u64,
+    byte_cost: u64,
+    compute_meter: Rc<RefCell<dyn ComputeMeter>>,
+    loader_id: &'a Pubkey,
+}
+impl<'a> SyscallObject<BpfError> for SyscallBlake3<'a> {
+    fn call(
+        &mut self,
+        vals_addr: u64,
+        vals_len: u64,
+        result_addr: u64,
+        _arg4: u64,
+        _arg5: u64,
+        memory_mapping: &MemoryMapping,
+        result: &mut Result<u64, EbpfError<BpfError>>,
+    ) {
+        question_mark!(self.compute_meter.consume(self.base_cost), result);
+        let hash_result = question_mark!(
+            translate_slice_mut::<u8>(
+                memory_mapping,
+                result_addr,
+                blake3::HASH_BYTES as u64,
+                self.loader_id,
+                true,
+            ),
+            result
+        );
+        let mut hasher = blake3::Hasher::default();
+        if vals_len > 0 {
+            let vals = question_mark!(
+                translate_slice::<&[u8]>(memory_mapping, vals_addr, vals_len, self.loader_id, true),
+                result
+            );
+            for val in vals.iter() {
+                let bytes = question_mark!(
+                    translate_slice::<u8>(
+                        memory_mapping,
+                        val.as_ptr() as u64,
+                        val.len() as u64,
+                        self.loader_id,
+                        true,
+                    ),
+                    result
+                );
+                question_mark!(
+                    self.compute_meter
+                        .consume(self.byte_cost * (val.len() as u64 / 2)),
+                    result
+                );
+                hasher.hash(bytes);
+            }
+        }
+        hash_result.copy_from_slice(&hasher.result().to_bytes());
+        *result = Ok(0);
+    }
+}
+
 // Cross-program invocation syscalls
 
 struct AccountReferences<'a> {