add more detailed exported symbols, useful for compressed code size listings

rt/header32.asm

@@ -6,6 +6,8 @@
 
 %include "elf.inc"
 
+global _EHDR
+_EHDR:
 ehdr:
     ; e_ident
     db 0x7F, "ELF"
@@ -47,6 +49,8 @@ ehdr:
 ;    dd (PHDR_R | PHDR_W)
 ;    dd 0x1;000
 %else
+global _PHDR
+_PHDR:
 phdr:
 %endif
 %ifdef USE_INTERP
@@ -81,6 +85,8 @@ phdr.end:
 
 %ifdef USE_INTERP
 [section .rodata.interp]
+global _INTERP
+_INTERP:
 interp:
     db "/lib/ld-linux.so.2",0
 interp.end:

rt/header64.asm

@@ -6,6 +6,8 @@
 
 %include "elf.inc"
 
+global _EHDR
+_EHDR:
 ehdr:
     ; e_ident
     db 0x7F, "ELF"
@@ -32,6 +34,8 @@ ehdr:
 ehdr.end:
 %endif
 
+global _PHDR
+_PHDR:
 phdr:
 %ifdef USE_INTERP
 phdr.interp:
@@ -88,6 +92,8 @@ phdr.end:
 
 %ifdef USE_INTERP
 [section .rodata.interp]
+global _INTERP
+_INTERP:
 interp:
     db "/lib64/ld-linux-x86-64.so.2", 0
 interp.end:

rt/loader32.asm

@@ -12,12 +12,15 @@
 %endif
 
 %ifndef USE_DNLOAD_LOADER
+global _smol_priv_data
+_smol_priv_data:
 _smol_linkmap:
     dd 0
 _smol_linkoff:
     dd 0
 %endif
 
+global _smol_start
 _smol_start:
    mov eax, [esp - 32] ; ???
 
@@ -273,4 +276,8 @@ repne scasd
 
       ;jmp short _start
            ; by abusing the linker script, _start ends up right here :)
+%ifdef ELF_TYPE
+global _smol_rt_end:
+_smol_rt_end:
+%endif
 

rt/loader64.asm

@@ -23,6 +23,7 @@ extern _symbols
 global _start
 _start:
 %endif
+global _smol_start:
 _smol_start:
 %ifdef USE_DL_FINI
    xchg r13, rdx ; _dl_fini
@@ -250,5 +251,9 @@ repne scasd ; technically, scasq should be used, but meh. this is 1 byte smaller
    xchg rsi, r13 ; _dl_fini
 %endif
         ; fallthru to _start
+%ifdef ELF_TYPE
+global _smol_rt_end:
+_smol_rt_end:
+%endif
 
 ;.loopme: jmp short .loopme

src/smolemit.py

@@ -60,6 +60,7 @@ dynamic.end:
 """)
 
     outf.write('[section .rodata.neededlibs]\n')
+    outf.write('global _strtab\n')
     outf.write('_strtab:\n')
     for library, symrels in libraries.items():
         outf.write('\t_symbols.{}: db "{}",0\n'.format(shorts[library], library))
@@ -68,6 +69,7 @@ dynamic.end:
     if not nx:
         outf.write('[section .text.smolplt]\n')
 
+    outf.write('global _symbols\n')
     outf.write('_symbols:\n')
     for library, symrels in libraries.items():
         for sym, reloc in symrels:
@@ -90,6 +92,7 @@ dynamic.end:
     outf.write('_symbols.end:\n')
 
     if nx:
+        outf.write('global _smolplt\n')
         outf.write('_smolplt:\n')
         for library, symrels in libraries.items():
             for sym, reloc in symrels:
@@ -139,12 +142,14 @@ dynamic.end:
 
     outf.write('[section .rodata.neededlibs]\n')
 
+    outf.write('global _strtab\n')
     outf.write('_strtab:\n')
     for library, symrels in libraries.items():
         outf.write('\t_symbols.{}: db "{}",0\n'.format(shorts[library], library))
 
     outf.write('[section .data.smolgot]\n')
 
+    outf.write('global _symbols\n')
     outf.write('_symbols:\n')
     for library, symrels in libraries.items():
         for sym, reloc in symrels:
@@ -166,6 +171,7 @@ global {name}
     outf.write('db 0\n')
     outf.write('_symbols.end:\n')
 
+    outf.write('global _smolplt\n')
     outf.write('_smolplt:\n')
     for library, symrels in libraries.items():
         for sym, reloc in symrels: