From f403938b6e04b626046f3a46183d5537661bd5d6 Mon Sep 17 00:00:00 2001
From: Ethan <ethteck@gmail.com>
Date: Mon, 25 Mar 2024 20:14:35 +0900
Subject: [PATCH] little more

---
 m2c/arch_mips.py | 13 ++++++++++---
 m2c/main.py      |  5 ++++-
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/m2c/arch_mips.py b/m2c/arch_mips.py
index f8da4c4c..b317e2a6 100644
--- a/m2c/arch_mips.py
+++ b/m2c/arch_mips.py
@@ -727,6 +727,8 @@ def match(self, matcher: AsmMatcher) -> Optional[Replacement]:
 class MipsArch(Arch):
     arch = Target.ArchEnum.MIPS
 
+    num_function_arg_registers = 4
+
     stack_pointer_reg = Register("sp")
     frame_pointer_reg = Register("fp")
     return_address_reg = Register("ra")
@@ -1718,6 +1720,7 @@ def function_abi(
                 offset = (offset + align - 1) & -align
                 name = param.name
                 reg2: Optional[Register]
+                # TODO EABI: support eabi float args
                 if ind < 2 and only_floats:
                     reg = Register("f12" if ind == 0 else "f14")
                     is_double = (
@@ -1740,7 +1743,11 @@ def function_abi(
                 else:
                     for i in range(offset // 4, (offset + size) // 4):
                         unk_offset = 4 * i - offset
-                        reg2 = Register(f"a{i}") if i < 4 else None
+                        reg2 = (
+                            Register(f"a{i}")
+                            if i < self.num_function_arg_registers
+                            else None
+                        )
                         if size > 4:
                             name2 = f"{name}_unk{unk_offset:X}" if name else None
                             sub_type = Type.any()
@@ -1762,7 +1769,7 @@ def function_abi(
                 offset += size
 
             if fn_sig.is_variadic:
-                for i in range(offset // 4, 4):
+                for i in range(offset // 4, self.num_function_arg_registers):
                     candidate_slots.append(
                         AbiArgSlot(i * 4, Register(f"a{i}"), Type.any_reg())
                     )
@@ -1854,7 +1861,7 @@ def function_return(expr: Expression) -> Dict[Register, Expression]:
 
 
 class MipseeArch(MipsArch):
-    arch = Target.ArchEnum.MIPS
+    num_function_arg_registers = 8
 
     stack_pointer_reg = Register("sp")
 
diff --git a/m2c/main.py b/m2c/main.py
index f4ed6de9..a3870d3e 100644
--- a/m2c/main.py
+++ b/m2c/main.py
@@ -66,7 +66,10 @@ def print_exception_as_comment(
 def run(options: Options) -> int:
     arch: Arch
     if options.target.arch == Target.ArchEnum.MIPS:
-        arch = MipsArch()
+        if options.target.platform == Target.PlatformEnum.MIPSEE:
+            arch = MipseeArch()
+        else:
+            arch = MipsArch()
     elif options.target.arch == Target.ArchEnum.PPC:
         arch = PpcArch()
     else: