From 16232b98d821fb65cd42fdd9c1f91251a42eb599 Mon Sep 17 00:00:00 2001
From: Nikita Smith <git.nikita.smith@gmail.com>
Date: Thu, 23 Oct 2025 14:00:02 -0700
Subject: [PATCH] SP from arch helper

---
 src/dwarf/dwarf.c | 11 +++++++++++
 src/dwarf/dwarf.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/src/dwarf/dwarf.c b/src/dwarf/dwarf.c
index db002a26..2b2f3966 100644
--- a/src/dwarf/dwarf.c
+++ b/src/dwarf/dwarf.c
@@ -94,6 +94,17 @@ dw_reg_max_size_from_arch(Arch arch)
   return max_size;
 }
 
+internal U64
+dw_sp_from_arch(Arch arch)
+{
+  switch (arch) {
+  default: NotImplemented;
+  case Arch_Null: return 0;
+  case Arch_x86:  return DW_RegX86_Esp;
+  case Arch_x64:  return DW_RegX64_Rsp;
+  }
+}
+
 internal DW_AttribClass
 dw_attrib_class_from_attrib_v2(DW_AttribKind k)
 {
diff --git a/src/dwarf/dwarf.h b/src/dwarf/dwarf.h
index 7419bed5..89e9b099 100644
--- a/src/dwarf/dwarf.h
+++ b/src/dwarf/dwarf.h
@@ -1746,6 +1746,7 @@ internal U64 dw_reg_size_from_code(Arch arch, DW_Reg reg_code);
 internal U64 dw_reg_pos_from_code(Arch arch, DW_Reg reg_code);
 internal U64 dw_reg_count_from_arch(Arch arch);
 internal U64 dw_reg_max_size_from_arch(Arch arch);
+internal U64 dw_sp_from_arch(Arch arch);
 
 //- Attrib Class Encodings