Add support for LoongArch (eliben#470)

refer: https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_e_flags_identifies_abi_type_and_version
xen0n · Apr 21, 2023 · 2059475 · 2059475
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diff --git a/elftools/elf/constants.py b/elftools/elf/constants.py
@@ -60,6 +60,13 @@ class E_FLAGS(object):
     EF_RISCV_RVE=0x00000008
     EF_RISCV_TSO=0x00000010
 
+    EF_LOONGARCH_ABI=0x000000C0
+    EF_LOONGARCH_ABI_V0=0x00000000
+    EF_LOONGARCH_ABI_V1=0x00000040
+    EF_LOONGARCH_FLOAT_ABI=0x00000003
+    EF_LOONGARCH_FLOAT_ABI_SOFT=0x00000001
+    EF_LOONGARCH_FLOAT_ABI_SINGLE=0x00000002
+    EF_LOONGARCH_FLOAT_ABI_DOUBLE=0x00000003
 
 class E_FLAGS_MASKS(object):
     """Masks to be used for convenience when working with E_FLAGS

diff --git a/elftools/elf/descriptions.py b/elftools/elf/descriptions.py
@@ -404,6 +404,7 @@ def describe_note_gnu_properties(properties):
     EM_PPC='PowerPC',
     EM_PPC64='PowerPC64',
     EM_RISCV='RISC-V',
+    EM_LOONGARCH='LoongArch',
     RESERVED='RESERVED',
 )
 

diff --git a/elftools/elf/enums.py b/elftools/elf/enums.py
@@ -257,6 +257,7 @@
     EM_RISCV         = 243, # RISC-V
     EM_BPF           = 247,	# Linux BPF - in-kernel virtual machine
     EM_CSKY          = 252,	# C-SKY
+    EM_LOONGARCH     = 258, # LoongArch
     EM_FRV           = 0x5441, # Fujitsu FR-V
     # Reservations
     # reserved  11-14   Reserved for future use

diff --git a/scripts/readelf.py b/scripts/readelf.py
@@ -259,6 +259,18 @@ def decode_flags(self, flags):
             if (flags & E_FLAGS.EF_RISCV_FLOAT_ABI) == E_FLAGS.EF_RISCV_FLOAT_ABI_QUAD:
                 description += ", quad-float ABI"
 
+        elif self.elffile['e_machine'] == "EM_LOONGARCH":
+            if (flags & E_FLAGS.EF_LOONGARCH_FLOAT_ABI) == E_FLAGS.EF_LOONGARCH_FLOAT_ABI_SOFT:
+                description += ", SOFT-FLOAT"
+            if (flags & E_FLAGS.EF_LOONGARCH_FLOAT_ABI) == E_FLAGS.EF_LOONGARCH_FLOAT_ABI_SINGLE:
+                description += ", SINGLE-FLOAT"
+            if (flags & E_FLAGS.EF_LOONGARCH_FLOAT_ABI) == E_FLAGS.EF_LOONGARCH_FLOAT_ABI_DOUBLE:
+                description += ", DOUBLE-FLOAT"
+            if (flags & E_FLAGS.EF_LOONGARCH_ABI) == E_FLAGS.EF_LOONGARCH_ABI_V0:
+                description += ", OBJ-v0"
+            if (flags & E_FLAGS.EF_LOONGARCH_ABI) == E_FLAGS.EF_LOONGARCH_ABI_V1:
+                description += ", OBJ-v1"
+
         return description
 
     def display_program_headers(self, show_heading=True):