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pull failed-unwind-step register-block-restore out of each impl, just do it on the caller side; pull out module-less read-the-stack-pointer unwind fallback from pe/x64 unwinder, use in module-less unwinds in all cases; call into from pe/x64 unwinder in fallback case

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This commit is contained in:
Ryan Fleury
2026-06-09 10:58:16 -07:00
parent ec4fd23e15
commit 0f02c32c89
5 changed files with 93 additions and 66 deletions
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src/dbg_engine/dbg_engine_ctrl.c
+10
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@@ -1797,6 +1797,7 @@ d_unwind_from_thread(Arena *arena, D_Handle thread, U64 endt_us)
//
void *regs_block = d_cached_reg_block_from_thread(scratch.arena, thread);
B32 regs_block_good = (arch != Arch_Null && regs_block != 0);
void *regs_block_restore = push_array(scratch.arena, U8, arch_reg_block_size);
//////////////////////////////
//- rjf: grab initial memory
@@ -1858,10 +1859,19 @@ d_unwind_from_thread(Arena *arena, D_Handle thread, U64 endt_us)
B32 step_is_good = 0;
for(;!unwind.flags;)
{
// rjf: remember registers pre-step
MemoryCopy(regs_block_restore, regs_block, arch_reg_block_size);
// rjf: try step
U64 cfa = 0;
UWND_StepResult step = uwnd_step(unwinder, arch, &memory_map, &unwinder_module_info, tls_vaddr, regs_block, &cfa);
// rjf: if the step failed -> restore original register values
if(step.status != UWND_StepStatus_Good)
{
MemoryCopy(regs_block, regs_block_restore, arch_reg_block_size);
}
// rjf: if we failed to read memory, try to read that memory, equip to memory map.
// if it is stale and we run out of time, we will need to mark the whole unwind as
// stale. if it can't be read, the unwind fails.