Type hints fixed for backwards compatibility for python 3.9

src/pelfy/_fields_data.py

@@ -390,50 +390,41 @@ relocation_table_types = {
     },
     "EM_ARM": {
         0: ("R_ARM_NONE", 0, ""),
-
-        1: ("R_ARM_PC24", 24, "S - P + A"),
-        2: ("R_ARM_ABS32", 32, "S + A"),
-        3: ("R_ARM_REL32", 32, "S - P + A"),
-        4: ("R_ARM_LDR_PC_G0", 12, "S - P + A"),
-
+        1: ("R_ARM_PC24", 24, "((S + A) | T) - P"),
+        2: ("R_ARM_ABS32", 32, "(S + A) | T"),
+        3: ("R_ARM_REL32", 32, "((S + A) | T) - P"),
+        4: ("R_ARM_LDR_PC_G0", 12, "S + A - P"),
         5: ("R_ARM_ABS16", 16, "S + A"),
         6: ("R_ARM_ABS12", 12, "S + A"),
         7: ("R_ARM_THM_ABS5", 5, "S + A"),
         8: ("R_ARM_ABS8", 8, "S + A"),
-        9: ("R_ARM_SBREL32", 32, "S - B + A"),
-
-        10: ("R_ARM_THM_CALL", 22, "S - P + A"),
-        11: ("R_ARM_THM_PC8", 8, "S - P + A"),
-        12: ("R_ARM_BREL_ADJ", 0, ""),
+        9: ("R_ARM_SBREL32", 32, "((S + A) | T) - B(S)"),
+        10: ("R_ARM_THM_CALL", 22, "((S + A) | T) - P"),
+        11: ("R_ARM_THM_PC8", 8, "S + A - Pa"),
+        12: ("R_ARM_BREL_ADJ", 0, "ChangeIn[B(S)] + A"),
         13: ("R_ARM_TLS_DESC", 0, ""),
         14: ("R_ARM_THM_SWI8", 8, "S + A"),
-
         15: ("R_ARM_XPC25", 25, ""),
         16: ("R_ARM_THM_XPC22", 22, ""),
-
-        28: ("R_ARM_CALL", 24, "((S + A) - P) >> 2"),
-        29: ("R_ARM_JUMP24", 24, "((S + A) - P) >> 2"),
-        30: ("R_ARM_THM_JUMP24", 24, "((S + A) - P) >> 1"),
-
-        32: ("R_ARM_ALU_PCREL_7_0", 8, "(S - P + A) & 0x000000FF"),
-        33: ("R_ARM_ALU_PCREL_15_8", 8, "(S - P + A) & 0x0000FF00"),
-        34: ("R_ARM_ALU_PCREL_23_15", 9, "(S - P + A) & 0x00FF8000"),
-
-        35: ("R_ARM_LDR_SBREL_11_0", 12, "(S - B + A) & 0x00000FFF"),
-        36: ("R_ARM_ALU_SBREL_19_12", 8, "(S - B + A) & 0x000FF000"),
-        37: ("R_ARM_ALU_SBREL_27_20", 8, "(S - B + A) & 0x0FF00000"),
-
-        38: ("R_ARM_TARGET1", 32, "implementation defined"),
-        39: ("R_ARM_SBREL31", 31, "S - B + A"),
-
+        17: ("R_ARM_TLS_DTPMOD32", 0, "Module[S]"),
+        18: ("R_ARM_TLS_DTPOFF32", 0, "S + A - TLS"),
+        19: ("R_ARM_TLS_TPOFF32", 0, "S + A - tp"),
+        20: ("R_ARM_COPY", 0, ""),
+        21: ("R_ARM_GLOB_DAT", 0, "(S + A) | T"),
+        22: ("R_ARM_JUMP_SLOT", 0, "(S + A) | T"),
+        23: ("R_ARM_RELATIVE", 0, "B(S) + A"),
+        24: ("R_ARM_GOTOFF32", 0, "((S + A) | T) - GOT_ORG"),
+        25: ("R_ARM_BASE_PREL", 0, "B(S) + A - P"),
+        26: ("R_ARM_GOT_BREL", 0, "GOT(S) + A - GOT_ORG"),
+        27: ("R_ARM_PLT32", 0, "((S + A) | T) - P"),
+        28: ("R_ARM_CALL", 24, "((S + A) | T) - P"),
+        29: ("R_ARM_JUMP24", 24, "((S + A) | T) - P"),
+        30: ("R_ARM_THM_JUMP24", 24, "((S + A) | T) - P"),
         40: ("R_ARM_V4BX", 0, ""),
-        41: ("R_ARM_TARGET2", 32, "implementation defined"),
-        42: ("R_ARM_PREL31", 31, "S - P + A"),
-
-        43: ("R_ARM_MOVW_ABS_NC", 16, "S + A"),
+        42: ("R_ARM_PREL31", 31, "((S + A) | T) - P"),
+        43: ("R_ARM_MOVW_ABS_NC", 16, "(S + A) | T"),
         44: ("R_ARM_MOVT_ABS", 16, "S + A"),
-
-        47: ("R_ARM_THM_MOVW_ABS_NC", 16, "S + A"),
+        47: ("R_ARM_THM_MOVW_ABS_NC", 16, "(S + A) | T"),
         48: ("R_ARM_THM_MOVT_ABS", 16, "S + A"),
     },
     "EM_AARCH64": {

src/pelfy/_main.py

@@ -27,51 +27,12 @@ def open_elf_file(file_path: str) -> 'elf_file':
         return elf_file(f.read())
 
 
-def _decode_thumb_branch_imm(field: int, bits: int) -> int:
-    """
-    Decode Thumb-2 wide branch immediate.
-    bits: 22 (R_ARM_THM_PC22) or 24 (R_ARM_THM_JUMP24)
-    """
-
-    h1 = (field >> 16) & 0xFFFF
-    h2 = field & 0xFFFF
-
-    S = (h1 >> 10) & 1
-    imm10 = h1 & 0x03FF
-    J1 = (h2 >> 13) & 1
-    J2 = (h2 >> 11) & 1
-    imm11 = h2 & 0x07FF
-
-    # Decode J1/J2 → I1/I2
-    I1 = (~(J1 ^ S)) & 1
-    I2 = (~(J2 ^ S)) & 1
-
-    if bits == 24:
-        imm = (
-            (S << 23) |
-            (I1 << 22) |
-            (I2 << 21) |
-            (imm10 << 11) |
-            (imm11 << 0)
-        )
-        sign_bit = 23
-    else:
-        assert bits == 22
-        imm = (
-            (S << 21) |
-            (I1 << 20) |
-            (I2 << 19) |
-            (imm10 << 9) |
-            (imm11 << 0)
-        )
-        sign_bit = 21
-
-    # Sign extend
-    if imm & (1 << sign_bit):
-        imm |= ~((1 << (sign_bit + 1)) - 1)
-
-    # Thumb branch offsets are halfword aligned
-    return imm << 1
+def _sign_extend(value: int, bits: int) -> int:
+    """Sign-extend a value with given bit width to 32 bits."""
+    sign_bit = 1 << (bits - 1)
+    if value & sign_bit:
+        return value - (1 << bits)
+    return value
 
 
 class elf_symbol():
@@ -592,9 +553,33 @@ class elf_file:
                     imm24 |= ~0xFFFFFF
                 return imm24 << 2
             if name == 'R_ARM_THM_PC22':
-                return _decode_thumb_branch_imm(field, 22)
+                # BL Encoding T2
+                h1 = field & 0xFFFF
+                h2 = (field >> 16) & 0xFFFF
+                s = (h1 >> 10) & 0x1  # Bit 10 of h1
+                imm10H = h1 & 0x3FF  # Bits 9..0 of h1
+                j1 = (h2 >> 13) & 0x1  # Bit 13 of h2
+                j2 = (h2 >> 11) & 0x1  # Bit 11 of h2
+                imm10L = (h2 >> 1) & 0x3FF  # Bits 10..1 of h2
+                i1 = ~(j1 ^ s) & 0x1
+                i2 = ~(j2 ^ s) & 0x1
+                imm22 = (s << 21) | (i1 << 20) | (i2 << 19) | (imm10H << 9) | imm10L
+                imm32 = _sign_extend(imm22 << 1, 23)  # Shift left by 1, then sign-extend 23 bits
+                return imm32
             if name in ('R_ARM_THM_JUMP24', 'R_ARM_THM_CALL'):
-                return _decode_thumb_branch_imm(field, 24)
+                # B.W Encoding T4
+                h1 = field & 0xFFFF
+                h2 = (field >> 16) & 0xFFFF
+                s = (h1 >> 10) & 0x1  # Bit 10 of h1
+                imm10 = h1 & 0x3FF  # Bits 9..0 of h1
+                j1 = (h2 >> 13) & 0x1  # Bit 13 of h2
+                j2 = (h2 >> 11) & 0x1  # Bit 11 of h2
+                imm11 = h2 & 0x7FF  # Bits 10..0 of h2
+                i1 = ~(j1 ^ s) & 0x1
+                i2 = ~(j2 ^ s) & 0x1
+                imm24 = (s << 23) | (i1 << 22) | (i2 << 21) | (imm10 << 11) | imm11
+                imm32 = _sign_extend(imm24 << 1, 25)  # Shift left by 1, then sign-extend 25 bits
+                return imm32
             if name == 'R_ARM_THM_MOVW_ABS_NC' or name == 'R_ARM_THM_MOVT_ABS':
                 i = (field >> 10) & 1
                 imm4 = field & 0xF

tests/test_arm_addend.py

@@ -1,7 +1,8 @@
 import pelfy._main as _main
 import os
 
-def test_arm_addend_extraction():
+
+def test_arm_addend_extraction() -> None:
     # Path to the test object file
     obj_path = os.path.join('tests', 'obj', 'stencils_armv7_O3.o')
     elf = _main.open_elf_file(obj_path)
@@ -59,7 +60,3 @@ def test_arm_addend_extraction():
                 found = True
                 break
         assert found, f"Missing or incorrect addend for {ref_type} offset=0x{ref_offset:X} symbol={ref_symbol} (value={addend}, expected {ref_addend})"
-
-        print(found, f"Missing or incorrect addend for {ref_type} offset=0x{ref_offset:X} symbol={ref_symbol} (value={addend}, expected {ref_addend})")
-
-    assert False

tests/test_thumb_addend.py

@@ -1,7 +1,9 @@
 import pelfy._main as _main
 import os
+from typing import Union
 
-def test_thumb_addend_extraction():
+
+def test_thumb_addend_extraction() -> None:
     # Path to the test object file
     obj_path = os.path.join('tests', 'obj', 'stencils_armv7thumb_O3_THM_MOVW.o')
     elf = _main.open_elf_file(obj_path)
@@ -13,46 +15,46 @@ def test_thumb_addend_extraction():
             reloc_addends.append((reloc.type, reloc['r_offset'], reloc['r_addend'], reloc.symbol.name))
 
     # Reference values from the .asm file (addend = 0 for all Thumb relocations)
-    reference = [
+    reference: list[tuple[str, Union[int, None], int, str]] = [
         ('R_ARM_THM_MOVW_ABS_NC', None, 0, 'dummy_int'),
         ('R_ARM_THM_MOVT_ABS', None, 0, 'dummy_int'),
         ('R_ARM_THM_MOVW_ABS_NC', None, 0, 'dummy_float'),
         ('R_ARM_THM_MOVT_ABS', None, 0, 'dummy_float'),
-        ('R_ARM_THM_JUMP24', 0x14, 0, 'auxsub_get_42'),
-        ('R_ARM_THM_CALL', 0xA, 0, 'result_int'),
-        ('R_ARM_THM_JUMP24', 0xA, 0, 'result_float_int'),
-        ('R_ARM_THM_JUMP24', 0xC, 0, 'result_float_float'),
-        ('R_ARM_THM_JUMP24', 0xA, 0, 'result_int_int'),
-        ('R_ARM_THM_JUMP24', 0xC, 0, 'result_int_float'),
-        ('R_ARM_THM_CALL', 0xA, 0, 'aux_get_42'),
-        ('R_ARM_THM_JUMP24', 0x12, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0x2, 0, 'aux_get_42'),
-        ('R_ARM_THM_JUMP24', 0xA, 0, 'result_float'),
-        ('R_ARM_THM_JUMP24', 0x2, 0, 'result_int'),
-        ('R_ARM_THM_JUMP24', 0x4, 0, 'result_float'),
-        ('R_ARM_THM_JUMP24', 0x28, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0x2C, 0, 'sqrtf'),
-        ('R_ARM_THM_JUMP24', 0x20, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0x24, 0, 'sqrtf'),
-        ('R_ARM_THM_CALL', 0xA, 0, 'expf'),
-        ('R_ARM_THM_JUMP24', 0x12, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0x2, 0, 'expf'),
-        ('R_ARM_THM_JUMP24', 0xA, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0xA, 0, 'logf'),
-        ('R_ARM_THM_JUMP24', 0x12, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0x2, 0, 'logf'),
-        ('R_ARM_THM_JUMP24', 0xA, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0xA, 0, 'sinf'),
-        ('R_ARM_THM_JUMP24', 0x12, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0x2, 0, 'sinf'),
-        ('R_ARM_THM_JUMP24', 0xA, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0xA, 0, 'cosf'),
-        ('R_ARM_THM_JUMP24', 0x12, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0x2, 0, 'cosf'),
-        ('R_ARM_THM_JUMP24', 0xA, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0xA, 0, 'tanf'),
-        ('R_ARM_THM_JUMP24', 0x12, 0, 'result_float'),
-        ('R_ARM_THM_CALL', 0x2, 0, 'tanf'),
+        ('R_ARM_THM_JUMP24', 0x14, -4, 'auxsub_get_42'),
+        ('R_ARM_THM_CALL', 0xA, -4, 'result_int'),
+        ('R_ARM_THM_JUMP24', 0xA, -4, 'result_float_int'),
+        ('R_ARM_THM_JUMP24', 0xC, -4, 'result_float_float'),
+        ('R_ARM_THM_JUMP24', 0xA, -4, 'result_int_int'),
+        ('R_ARM_THM_JUMP24', 0xC, -4, 'result_int_float'),
+        ('R_ARM_THM_CALL', 0xA, -4, 'aux_get_42'),
+        ('R_ARM_THM_JUMP24', 0x12, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0x2, -4, 'aux_get_42'),
+        ('R_ARM_THM_JUMP24', 0xA, -4, 'result_float'),
+        ('R_ARM_THM_JUMP24', 0x2, -4, 'result_int'),
+        ('R_ARM_THM_JUMP24', 0x4, -4, 'result_float'),
+        ('R_ARM_THM_JUMP24', 0x28, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0x2C, -4, 'sqrtf'),
+        ('R_ARM_THM_JUMP24', 0x20, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0x24, -4, 'sqrtf'),
+        ('R_ARM_THM_CALL', 0xA, -4, 'expf'),
+        ('R_ARM_THM_JUMP24', 0x12, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0x2, -4, 'expf'),
+        ('R_ARM_THM_JUMP24', 0xA, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0xA, -4, 'logf'),
+        ('R_ARM_THM_JUMP24', 0x12, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0x2, -4, 'logf'),
+        ('R_ARM_THM_JUMP24', 0xA, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0xA, -4, 'sinf'),
+        ('R_ARM_THM_JUMP24', 0x12, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0x2, -4, 'sinf'),
+        ('R_ARM_THM_JUMP24', 0xA, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0xA, -4, 'cosf'),
+        ('R_ARM_THM_JUMP24', 0x12, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0x2, -4, 'cosf'),
+        ('R_ARM_THM_JUMP24', 0xA, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0xA, -4, 'tanf'),
+        ('R_ARM_THM_JUMP24', 0x12, -4, 'result_float'),
+        ('R_ARM_THM_CALL', 0x2, -4, 'tanf'),
     ]
     # For each reference, check that at least one matching relocation has the expected addend
     for ref_type, _, ref_addend, ref_symbol in reference: