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extend process memory cache queries with output channel for staleness detection - in some cases this is crucial, in other cases you don't care & want to passively accept stale redsults

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This commit is contained in:
Ryan Fleury
2024-03-22 10:33:20 -07:00
parent a694a77eba
commit 982f2b6bab
4 changed files with 52 additions and 42 deletions
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src/ctrl/ctrl_core.c
+45 -36
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@@ -896,7 +896,7 @@ ctrl_hash_store_key_from_process_vaddr_range(CTRL_MachineID machine_id, DMN_Hand
}
internal U128
ctrl_stored_hash_from_process_vaddr_range(CTRL_MachineID machine_id, DMN_Handle process, Rng1U64 range, B32 zero_terminated, U64 endt_us)
ctrl_stored_hash_from_process_vaddr_range(CTRL_MachineID machine_id, DMN_Handle process, Rng1U64 range, B32 zero_terminated, B32 *out_is_stale, U64 endt_us)
{
U128 result = {0};
U64 size = dim_1u64(range);
@@ -1033,6 +1033,10 @@ ctrl_stored_hash_from_process_vaddr_range(CTRL_MachineID machine_id, DMN_Handle
//- rjf: out of time? -> exit
if(os_now_microseconds() >= endt_us)
{
if(is_good && is_stale && out_is_stale)
{
out_is_stale[0] = 1;
}
break;
}
@@ -1072,8 +1076,10 @@ ctrl_query_cached_data_from_process_vaddr_range(Arena *arena, CTRL_MachineID mac
{
U64 page_base_vaddr = page_range.min + page_idx*page_size;
U128 page_key = ctrl_hash_store_key_from_process_vaddr_range(machine_id, process, r1u64(page_base_vaddr, page_base_vaddr+page_size), 0);
U128 page_hash = ctrl_stored_hash_from_process_vaddr_range(machine_id, process, r1u64(page_base_vaddr, page_base_vaddr+page_size), 0, endt_us);
B32 page_is_stale = 0;
U128 page_hash = ctrl_stored_hash_from_process_vaddr_range(machine_id, process, r1u64(page_base_vaddr, page_base_vaddr+page_size), 0, &page_is_stale, endt_us);
U128 page_last_hash = hs_hash_from_key(page_key, 1);
result.stale = (result.stale || page_is_stale);
page_hashes[page_idx] = page_hash;
page_last_hashes[page_idx] = page_last_hash;
}
@@ -1399,49 +1405,51 @@ ctrl_unwind_from_thread(Arena *arena, CTRL_EntityStore *store, CTRL_MachineID ma
ProfBeginFunction();
Temp scratch = scratch_begin(&arena, 1);
DBGI_Scope *scope = dbgi_scope_open();
CTRL_Unwind unwind = {0};
unwind.error = 1;
//- rjf: unpack args
CTRL_Entity *thread_entity = ctrl_entity_from_machine_id_handle(store, machine_id, thread);
CTRL_Entity *process_entity = thread_entity->parent;
Architecture arch = thread_entity->arch;
U64 arch_reg_block_size = regs_block_size_from_architecture(arch);
CTRL_Unwind unwind = {0};
unwind.error = 1;
switch(arch)
//- rjf: grab initial register block
void *regs_block = ctrl_query_cached_reg_block_from_thread(scratch.arena, machine_id, thread);
//- rjf: grab initial memory view
B32 stack_memview_good = 0;
UNW_MemView stack_memview = {0};
{
U64 stack_base_unrounded = dmn_stack_base_vaddr_from_thread(thread);
U64 stack_top_unrounded = regs_rsp_from_arch_block(arch, regs_block);
U64 stack_base = AlignPow2(stack_base_unrounded, KB(4));
U64 stack_top = AlignDownPow2(stack_top_unrounded, KB(4));
U64 stack_size = stack_base - stack_top;
if(stack_base >= stack_top)
{
CTRL_ProcessMemorySlice stack_memory_slice = ctrl_query_cached_data_from_process_vaddr_range(scratch.arena, machine_id, process_entity->handle, r1u64(stack_top, stack_top+stack_size), endt_us);
String8 stack_memory = stack_memory_slice.data;
if(stack_memory.size != 0 && !stack_memory_slice.any_byte_bad && !stack_memory_slice.stale)
{
stack_memview_good = 1;
stack_memview.data = stack_memory.str;
stack_memview.addr_first = stack_top;
stack_memview.addr_opl = stack_base;
}
}
}
//- rjf: loop & unwind
UNW_MemView memview = stack_memview;
if(stack_memview_good) switch(arch)
{
default:{}break;
case Architecture_x64:
{
// rjf: grab initial register block
void *regs_block = ctrl_query_cached_reg_block_from_thread(scratch.arena, machine_id, thread);
// rjf: grab initial memory view
B32 stack_memview_good = 0;
UNW_MemView stack_memview = {0};
unwind.error = 0;
for(;;)
{
U64 stack_base_unrounded = dmn_stack_base_vaddr_from_thread(thread);
U64 stack_top_unrounded = regs_rsp_from_arch_block(arch, regs_block);
U64 stack_base = AlignPow2(stack_base_unrounded, KB(4));
U64 stack_top = AlignDownPow2(stack_top_unrounded, KB(4));
U64 stack_size = stack_base - stack_top;
if(stack_base >= stack_top)
{
CTRL_ProcessMemorySlice stack_memory_slice = ctrl_query_cached_data_from_process_vaddr_range(scratch.arena, machine_id, process_entity->handle, r1u64(stack_top, stack_top+stack_size), endt_us);
String8 stack_memory = stack_memory_slice.data;
if(stack_memory.size != 0 && !stack_memory_slice.any_byte_bad)
{
stack_memview_good = 1;
stack_memview.data = stack_memory.str;
stack_memview.addr_first = stack_top;
stack_memview.addr_opl = stack_base;
}
}
}
// rjf: loop & unwind
UNW_MemView memview = stack_memview;
if(stack_memview_good) for(;;)
{
unwind.error = 0;
// rjf: regs -> rip*module
U64 rip = regs_rip_from_arch_block(arch, regs_block);
DMN_Handle module = {0};
@@ -1504,6 +1512,7 @@ ctrl_unwind_from_thread(Arena *arena, CTRL_EntityStore *store, CTRL_MachineID ma
}
}break;
}
dbgi_scope_close(scope);
scratch_end(scratch);
ProfEnd();