fix misformed elfclass32 bug

Author: k4lizen

docs/add-symbol-file.md

@@ -97,7 +97,7 @@ However, when I use qemu-user to debug an aarch32 binary and make an aarch32 fil
 ```bash
 zig cc main.c --target=arm-linux-musleabi -o mainarm -static
 llvm-strip mainarm
-qemu-user -g 1234 mainarm
+qemu-arm -g 1234 mainarm
 
 gdb mainarm
 gdb> tar rem :1234

niche_elf/builder.py

@@ -149,7 +149,9 @@ def add_symbols(self, symbols: list[Symbol]) -> None:
                 # FIXME: Check does GDB actually look at this?
                 sh_info=1,
                 sh_addralign=8,
-                sh_entsize=24,
+                # Fucking crucial, or you'll fail a check in GDB's bfd/elf.c:bfd_section_from_shdr
+                # if (hdr->sh_entsize != bed->s->sizeof_sym)
+                sh_entsize=ctypes.sizeof(self.ElfSym),
                 sh_offset=-1,
             ),
         )

niche_elf/elf.py

@@ -27,8 +27,8 @@ def __init__(self, textbase: int) -> None:
         # For some reason, this works for me even when debugging other architectures (e.g. aarch32),
         # and when debugging from different host architectures (e.g. aarch64). So I'm pinning it to
         # x86_64 with ELFCLASS64 (which is what ptrbits controls) until we encounter some issues.
-        # Important to note: ELFCLASS32 does not work at all for me for some reason. And ELFCLASS64
-        # with zig_target_arch set to a more obscure architecture also doesn't work.
+        # Important to note: ELFCLASS64 with zig_target_arch set to a more obscure architecture
+        # doesn't work.
         # My stupid chungus life.
         ptrbits = 64
         zig_target_arch = "x86_64"