ELF Loader Implementation

[vmlemon]

ELF Loader Implementation

[vmlemon]

For testing, I imported https://hg.icculus.org/icculus/mojoelf/file/78de07f0b181

[vmlemon]

After adding more types, that code gets to:

tyson@tyson-Lenovo-ideapad-120S-14IAP:~/Orion/user/apps/system$ make
===> mojoelf.c
gcc-6 -I../../include -I../.. -I/usr/lib/gcc/x86_64-linux-gnu/6/include   -nostdinc -g -O2 -m64 -mno-red-zone   -fno-stack-protector -lssp -O2 -g -Wall -Wshadow   -fno-stack-protector  -Wconversion -std=c99 -c mojoelf.c -o mojoelf.o
In file included from mojoelf.c:9:0:
../../include/stdio.h: In function ‘__sputc’:
../../include/stdio.h:460:23: warning: conversion to ‘unsigned char’ from ‘int’ may alter its value [-Wconversion]
   return (*_p->_p++ = _c);
                       ^~
In file included from mojoelf.c:16:0:
../../include/sys/types.h: In function ‘__bitcount16’:
../../include/sys/types.h:327:7: warning: conversion to ‘__uint16_t {aka short unsigned int}’ from ‘int’ may alter its value [-Wconversion]
  _x = (_x & 0x5555) + ((_x & 0xaaaa) >> 1);
       ^
../../include/sys/types.h:328:7: warning: conversion to ‘__uint16_t {aka short unsigned int}’ from ‘int’ may alter its value [-Wconversion]
  _x = (_x & 0x3333) + ((_x & 0xcccc) >> 2);
       ^
In file included from ../../include/sys/types.h:376:0,
                 from mojoelf.c:16:
../../include/sys/select.h: At top level:
../../include/sys/select.h:105:54: warning: ‘struct timeval’ declared inside parameter list will not be visible outside of this definition or declaration
 int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
                                                      ^~~~~~~
In file included from mojoelf.c:16:0:
../../include/sys/types.h: In function ‘__major’:
../../include/sys/types.h:393:36: warning: conversion to ‘int’ from ‘dev_t {aka long unsigned int}’ may alter its value [-Wconversion]
  return (((_d >> 32) & 0xffffff00) | ((_d >> 8) & 0xff));
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
../../include/sys/types.h: In function ‘__minor’:
../../include/sys/types.h:399:32: warning: conversion to ‘int’ from ‘dev_t {aka long unsigned int}’ may alter its value [-Wconversion]
  return (((_d >> 24) & 0xff00) | (_d & 0xffff00ff));
         ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
../../include/sys/types.h: In function ‘__makedev’:
../../include/sys/types.h:405:26: warning: conversion to ‘unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
  return (((dev_t)(_Major & 0xffffff00) << 32) | ((_Major & 0xff) << 8) |
                          ^
../../include/sys/types.h:405:47: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
  return (((dev_t)(_Major & 0xffffff00) << 32) | ((_Major & 0xff) << 8) |
                                               ^
../../include/sys/types.h:406:49: warning: conversion to ‘unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
      ((dev_t)(_Minor & 0xff00) << 24) | (_Minor & 0xffff00ff));
                                                 ^
mojoelf.c: In function ‘Malloc’:
mojoelf.c:375:20: warning: implicit declaration of function ‘calloc’ [-Wimplicit-function-declaration]
     void *retval = calloc(1, len);
                    ^~~~~~
mojoelf.c:375:20: warning: incompatible implicit declaration of built-in function ‘calloc’
mojoelf.c:375:20: note: include ‘<stdlib.h>’ or provide a declaration of ‘calloc’
mojoelf.c: In function ‘validate_elf_header’:
mojoelf.c:453:28: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
     else if ((hdr->e_phoff + (hdr->e_phnum * hdr->e_phentsize)) > ctx->buflen)
                            ^
mojoelf.c:455:28: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
     else if ((hdr->e_shoff + (hdr->e_shnum * hdr->e_shentsize)) > ctx->buflen)
                            ^
mojoelf.c: In function ‘process_program_headers’:
mojoelf.c:521:32: warning: conversion to ‘int’ from ‘long unsigned int’ may alter its value [-Wconversion]
             ctx->dyntabcount = (program->p_filesz / sizeof (ElfDynTable));
                                ^
mojoelf.c: In function ‘process_section_headers’:
mojoelf.c:565:32: warning: conversion to ‘int’ from ‘long unsigned int’ may alter its value [-Wconversion]
             ctx->symtabcount = section->sh_size / MOJOELF_SIZEOF_SYMENT;
                                ^~~~~~~
mojoelf.c: In function ‘map_pages’:
mojoelf.c:301:26: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration]
 #define Memzero(buf,len) memset(buf, '\0', len)
                          ^
mojoelf.c:596:5: note: in expansion of macro ‘Memzero’
     Memzero(mmapaddr, mmaplen);
     ^~~~~~~
mojoelf.c:301:26: warning: incompatible implicit declaration of built-in function ‘memset’
 #define Memzero(buf,len) memset(buf, '\0', len)
                          ^
mojoelf.c:596:5: note: in expansion of macro ‘Memzero’
     Memzero(mmapaddr, mmaplen);
     ^~~~~~~
mojoelf.c:301:26: note: include ‘<string.h>’ or provide a declaration of ‘memset’
 #define Memzero(buf,len) memset(buf, '\0', len)
                          ^
mojoelf.c:596:5: note: in expansion of macro ‘Memzero’
     Memzero(mmapaddr, mmaplen);
     ^~~~~~~
mojoelf.c:302:30: warning: implicit declaration of function ‘memcpy’ [-Wimplicit-function-declaration]
 #define Memcopy(dst,src,len) memcpy(dst,src,len)
                              ^
mojoelf.c:606:13: note: in expansion of macro ‘Memcopy’
             Memcopy(ptr, ctx->buf + program->p_offset, program->p_filesz);
             ^~~~~~~
mojoelf.c:302:30: warning: incompatible implicit declaration of built-in function ‘memcpy’
 #define Memcopy(dst,src,len) memcpy(dst,src,len)
                              ^
mojoelf.c:606:13: note: in expansion of macro ‘Memcopy’
             Memcopy(ptr, ctx->buf + program->p_offset, program->p_filesz);
             ^~~~~~~
mojoelf.c:302:30: note: include ‘<string.h>’ or provide a declaration of ‘memcpy’
 #define Memcopy(dst,src,len) memcpy(dst,src,len)
                              ^
mojoelf.c:606:13: note: in expansion of macro ‘Memcopy’
             Memcopy(ptr, ctx->buf + program->p_offset, program->p_filesz);
             ^~~~~~~
mojoelf.c: In function ‘load_external_dependencies’:
mojoelf.c:837:72: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
     ctx->retval->dlopens = (void **) Malloc(ctx->retval->dlopens_count * sizeof (void *));
                                                                        ^
mojoelf.c:866:5: warning: implicit declaration of function ‘assert’ [-Wimplicit-function-declaration]
     assert(0);
     ^~~~~~
mojoelf.c: In function ‘do_fixup’:
mojoelf.c:942:13: warning: incompatible implicit declaration of built-in function ‘memcpy’
             memcpy(fixup, (void *) addr, (ctx->symtab+r_sym)->st_size);
             ^~~~~~
mojoelf.c:942:13: note: include ‘<string.h>’ or provide a declaration of ‘memcpy’
mojoelf.c:952:39: warning: conversion to ‘long unsigned int’ from ‘intptr {aka const long int}’ may change the sign of the result [-Wsign-conversion]
             *fixup += (uintptr) (addr + r_addend);
                                       ^
mojoelf.c:955:40: warning: conversion to ‘long unsigned int’ from ‘intptr {aka const long int}’ may change the sign of the result [-Wsign-conversion]
             *fixup += (uintptr) ((addr + r_addend) - ((uintptr) fixup));
                                        ^
mojoelf.c: In function ‘add_exported_symbol’:
mojoelf.c:1057:44: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration]
     syms[syms_count].sym = (char *) Malloc(strlen(sym) + 1);
                                            ^~~~~~
mojoelf.c:1057:44: warning: incompatible implicit declaration of built-in function ‘strlen’
mojoelf.c:1057:44: note: include ‘<string.h>’ or provide a declaration of ‘strlen’
mojoelf.c:300:21: warning: implicit declaration of function ‘strcpy’ [-Wimplicit-function-declaration]
 #define Strcpy(a,b) strcpy(a,b)
                     ^
mojoelf.c:1061:5: note: in expansion of macro ‘Strcpy’
     Strcpy(syms[syms_count].sym, sym);
     ^~~~~~
mojoelf.c:300:21: warning: incompatible implicit declaration of built-in function ‘strcpy’
 #define Strcpy(a,b) strcpy(a,b)
                     ^
mojoelf.c:1061:5: note: in expansion of macro ‘Strcpy’
     Strcpy(syms[syms_count].sym, sym);
     ^~~~~~
mojoelf.c:300:21: note: include ‘<string.h>’ or provide a declaration of ‘strcpy’
 #define Strcpy(a,b) strcpy(a,b)
                     ^
mojoelf.c:1061:5: note: in expansion of macro ‘Strcpy’
     Strcpy(syms[syms_count].sym, sym);
     ^~~~~~
mojoelf.c: In function ‘build_export_list’:
mojoelf.c:1101:67: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
     ctx->retval->syms = (ElfSymbols *) Malloc(sizeof (ElfSymbols) * symcount);
                                                                   ^
mojoelf.c: In function ‘MOJOELF_dlopen_mem’:
mojoelf.c:301:26: warning: incompatible implicit declaration of built-in function ‘memset’
 #define Memzero(buf,len) memset(buf, '\0', len)
                          ^
mojoelf.c:1168:5: note: in expansion of macro ‘Memzero’
     Memzero(&ctx, sizeof (ElfContext));
     ^~~~~~~
mojoelf.c:301:26: note: include ‘<string.h>’ or provide a declaration of ‘memset’
 #define Memzero(buf,len) memset(buf, '\0', len)
                          ^
mojoelf.c:1168:5: note: in expansion of macro ‘Memzero’
     Memzero(&ctx, sizeof (ElfContext));
     ^~~~~~~
mojoelf.c: In function ‘MOJOELF_dlsym’:
mojoelf.c:299:21: warning: implicit declaration of function ‘strcmp’ [-Wimplicit-function-declaration]
 #define Strcmp(a,b) strcmp(a,b)
                     ^
mojoelf.c:1216:13: note: in expansion of macro ‘Strcmp’
         if (Strcmp(h->syms[i].sym, sym) == 0)
             ^~~~~~
mojoelf.c: In function ‘MOJOELF_dlclose’:
mojoelf.c:1250:9: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration]
         free(h->dlopens);
         ^~~~
mojoelf.c:1250:9: warning: incompatible implicit declaration of built-in function ‘free’
mojoelf.c:1250:9: note: include ‘<stdlib.h>’ or provide a declaration of ‘free’
mojoelf.c:1259:13: warning: incompatible implicit declaration of built-in function ‘free’
             free(h->syms[i].sym);
             ^~~~
mojoelf.c:1259:13: note: include ‘<stdlib.h>’ or provide a declaration of ‘free’
mojoelf.c:1260:9: warning: incompatible implicit declaration of built-in function ‘free’
         free(h->syms);
         ^~~~
mojoelf.c:1260:9: note: include ‘<stdlib.h>’ or provide a declaration of ‘free’
mojoelf.c:1263:5: warning: incompatible implicit declaration of built-in function ‘free’
     free(h);
     ^~~~
mojoelf.c:1263:5: note: include ‘<stdlib.h>’ or provide a declaration of ‘free’
mojoelf.c: In function ‘MOJOELF_dlopen_file’:
mojoelf.c:1276:21: warning: implicit declaration of function ‘strerror’ [-Wimplicit-function-declaration]
         set_dlerror(strerror(errno));
                     ^~~~~~~~
mojoelf.c:1276:21: warning: passing argument 1 of ‘set_dlerror’ makes pointer from integer without a cast [-Wint-conversion]
mojoelf.c:135:24: note: expected ‘const char *’ but argument is of type ‘int’
     static inline void set_dlerror(const char *msg) { dlerror_msg = msg; }
                        ^~~~~~~~~~~
mojoelf.c:1278:21: warning: passing argument 1 of ‘set_dlerror’ makes pointer from integer without a cast [-Wint-conversion]
         set_dlerror(strerror(errno));
                     ^~~~~~~~
mojoelf.c:135:24: note: expected ‘const char *’ but argument is of type ‘int’
     static inline void set_dlerror(const char *msg) { dlerror_msg = msg; }
                        ^~~~~~~~~~~
mojoelf.c:1279:31: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration]
     else if ((buf = (uint8 *) malloc(statbuf.st_size)) == NULL)
                               ^~~~~~
mojoelf.c:1279:31: warning: incompatible implicit declaration of built-in function ‘malloc’
mojoelf.c:1279:31: note: include ‘<stdlib.h>’ or provide a declaration of ‘malloc’
mojoelf.c:1279:38: warning: conversion to ‘long unsigned int’ from ‘off_t {aka long int}’ may change the sign of the result [-Wsign-conversion]
     else if ((buf = (uint8 *) malloc(statbuf.st_size)) == NULL)
                                      ^~~~~~~
mojoelf.c:1281:14: warning: implicit declaration of function ‘read’ [-Wimplicit-function-declaration]
     else if (read(fd, buf, statbuf.st_size) != statbuf.st_size)
              ^~~~
mojoelf.c:1282:21: warning: passing argument 1 of ‘set_dlerror’ makes pointer from integer without a cast [-Wint-conversion]
         set_dlerror(strerror(errno));
                     ^~~~~~~~
mojoelf.c:135:24: note: expected ‘const char *’ but argument is of type ‘int’
     static inline void set_dlerror(const char *msg) { dlerror_msg = msg; }
                        ^~~~~~~~~~~
mojoelf.c:1285:9: warning: implicit declaration of function ‘close’ [-Wimplicit-function-declaration]
         close(fd);
         ^~~~~
mojoelf.c:1294:9: warning: incompatible implicit declaration of built-in function ‘free’
         free(buf);
         ^~~~
mojoelf.c:1294:9: note: include ‘<stdlib.h>’ or provide a declaration of ‘free’
===> Linking ./syslaunch
ld -e_start -N -L../../lib -L/usr/lib/gcc/x86_64-linux-gnu/6 -nostdlib  -melf_x86_64  -Ttext=01000000 crt0-amd64.o syslaunch.o mojoelf.o    -ll4 -lio  -llinux  -lgcc -o syslaunch
ld: mojoelf.o: in function `MOJOELF_dlsym':
/home/tyson/Orion/user/apps/system/mojoelf.c:1216: undefined reference to `strcmp'
ld: mojoelf.o: in function `do_fixup':
/home/tyson/Orion/user/apps/system/mojoelf.c:942: undefined reference to `memcpy'
ld: mojoelf.o: in function `MOJOELF_dlclose':
/home/tyson/Orion/user/apps/system/mojoelf.c:1250: undefined reference to `free'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1254: undefined reference to `munmap'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1259: undefined reference to `free'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1260: undefined reference to `free'
ld: mojoelf.o: in function `MOJOELF_dlopen_mem':
/home/tyson/Orion/user/apps/system/mojoelf.c:1157: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1158: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1159: undefined reference to `assert'
ld: mojoelf.o: in function `Malloc':
/home/tyson/Orion/user/apps/system/mojoelf.c:375: undefined reference to `calloc'
ld: mojoelf.o: in function `map_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:590: undefined reference to `mmap'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:596: undefined reference to `memset'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:606: undefined reference to `memcpy'
ld: mojoelf.o: in function `Malloc':
/home/tyson/Orion/user/apps/system/mojoelf.c:375: undefined reference to `calloc'
ld: mojoelf.o: in function `add_exported_symbol':
/home/tyson/Orion/user/apps/system/mojoelf.c:1057: undefined reference to `strlen'
ld: mojoelf.o: in function `Malloc':
/home/tyson/Orion/user/apps/system/mojoelf.c:375: undefined reference to `calloc'
ld: mojoelf.o: in function `add_exported_symbol':
/home/tyson/Orion/user/apps/system/mojoelf.c:1061: undefined reference to `strcpy'
ld: mojoelf.o: in function `build_export_list':
/home/tyson/Orion/user/apps/system/mojoelf.c:1126: undefined reference to `assert'
ld: mojoelf.o: in function `fixup_jmprel':
/home/tyson/Orion/user/apps/system/mojoelf.c:1034: undefined reference to `assert'
ld: mojoelf.o: in function `protect_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:636: undefined reference to `mprotect'
ld: mojoelf.o: in function `Malloc':
/home/tyson/Orion/user/apps/system/mojoelf.c:375: undefined reference to `calloc'
ld: mojoelf.o: in function `load_external_dependencies':
/home/tyson/Orion/user/apps/system/mojoelf.c:866: undefined reference to `assert'
ld: mojoelf.o: in function `MOJOELF_dlopen_file':
/home/tyson/Orion/user/apps/system/mojoelf.c:1272: undefined reference to `open'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1277: undefined reference to `fstat'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1279: undefined reference to `malloc'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1281: undefined reference to `read'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1285: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1294: undefined reference to `free'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1282: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1282: undefined reference to `strerror'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1291: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1291: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1276: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1276: undefined reference to `strerror'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1278: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1278: undefined reference to `strerror'
ld: mojoelf.o: in function `MOJOELF_dlclose':
/home/tyson/Orion/user/apps/system/mojoelf.c:1263: undefined reference to `free'
make: *** [../../Mk/l4.prog.mk:54: syslaunch] Error 1
tyson@tyson-Lenovo-ideapad-120S-14IAP:~/Orion/user/apps/system$ 

[vmlemon]

Imported FreeBSD implementations of strcmp/memcpy

[vmlemon]

Imported FreeBSD's strerror

[vmlemon]

If we want to try using MojoELF, we need pthreads (see #19). :(

[vmlemon]

Looking at https://hg.icculus.org/icculus/mojoelf/file/tip/README.txt, there seems to be various definitions for disabling the use of certain functions

[vmlemon]

For x86, the specification at http://www.sco.com/developers/devspecs/abi386-4.pdf exists (we should also implement some of the extra functionality, and types, above-and-beyond ELF loading, later), https://www.freebsd.org/cgi/man.cgi?query=elf&sektion=3&manpath=FreeBSD+7.0-RELEASE documents some APIs/defines, http://uw714doc.sco.com/en/man/html.5/types.5.html defines some types referred to in the UNIX System V ABI, UNIXWare sysconf() is at https://pubs.opengroup.org/onlinepubs/009695399/functions/sysconf.html, https://www.sco.com/developers/gabi/latest/ch4.eheader.html documents the ELF header.

For PowerPC, Wii U RPXes are documented in https://github.com/libretro/RetroArch/blob/master/wiiu/hbl.c.

[vmlemon]

Added some of the CellOS ELF segment types, from https://www.psdevwiki.com/ps3/SELF_File_Format_and_Decryption, for future-proofing, in support of #10...

[vmlemon]

The current state of this is, that after implementing Enryo's liballoc, as part of #20, we now get this far:

===> Linking ./syslaunch
ld -e_start -N -L../../lib -L/usr/lib/gcc/x86_64-linux-gnu/8 -nostdlib  -melf_x86_64  -Ttext=01000000 crt0-amd64.o syslaunch.o mojoelf.o    -ll4 -lio  -llinux  -lgcc -o syslaunch
ld: mojoelf.o: in function `MOJOELF_dlclose':
/home/tyson/Orion/user/apps/system/mojoelf.c:1293: undefined reference to `munmap'
ld: mojoelf.o: in function `MOJOELF_dlopen_mem':
/home/tyson/Orion/user/apps/system/mojoelf.c:1196: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1197: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1198: undefined reference to `assert'
ld: mojoelf.o: in function `map_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:629: undefined reference to `mmap'
ld: mojoelf.o: in function `add_exported_symbol':
/home/tyson/Orion/user/apps/system/mojoelf.c:1096: undefined reference to `strlen'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1100: undefined reference to `strcpy'
ld: mojoelf.o: in function `build_export_list':
/home/tyson/Orion/user/apps/system/mojoelf.c:1165: undefined reference to `assert'
ld: mojoelf.o: in function `fixup_jmprel':
/home/tyson/Orion/user/apps/system/mojoelf.c:1073: undefined reference to `assert'
ld: mojoelf.o: in function `protect_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:675: undefined reference to `mprotect'
ld: mojoelf.o: in function `load_external_dependencies':
/home/tyson/Orion/user/apps/system/mojoelf.c:905: undefined reference to `assert'
ld: mojoelf.o: in function `MOJOELF_dlopen_file':
/home/tyson/Orion/user/apps/system/mojoelf.c:1311: undefined reference to `open'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1316: undefined reference to `fstat'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1320: undefined reference to `read'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1324: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1321: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1315: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1317: undefined reference to `__error'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror_r':
/home/tyson/Orion/user/lib/linux/strerror.c:91: undefined reference to `sys_nerr'
ld: ../../lib/liblinux.a(strerror.o): in function `errstr':
/home/tyson/Orion/user/lib/linux/strerror.c:77: undefined reference to `__uprefix'
ld: /home/tyson/Orion/user/lib/linux/strerror.c:77: undefined reference to `strlcpy'
ld: /home/tyson/Orion/user/lib/linux/strerror.c:78: undefined reference to `strlcat'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror_r':
/home/tyson/Orion/user/lib/linux/strerror.c:101: undefined reference to `sys_errlist'
ld: /home/tyson/Orion/user/lib/linux/strerror.c:101: undefined reference to `strlcpy'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror':
/home/tyson/Orion/user/lib/linux/strerror.c:125: undefined reference to `__error'
ld: syslaunch: hidden symbol `__uprefix' isn't defined
ld: final link failed: bad value
make: *** [../../Mk/l4.prog.mk:54: syslaunch] Error 1

[vmlemon]

After importing more functions:

===> Linking ./syslaunch
ld -e_start -N -L../../lib -L/usr/lib/gcc/x86_64-linux-gnu/8 -nostdlib  -melf_x86_64  -Ttext=01000000 crt0-amd64.o syslaunch.o mojoelf.o    -ll4 -lio  -llinux  -lgcc -o syslaunch
ld: mojoelf.o: in function `MOJOELF_dlclose':
/home/tyson/Orion/user/apps/system/mojoelf.c:1293: undefined reference to `munmap'
ld: mojoelf.o: in function `MOJOELF_dlopen_mem':
/home/tyson/Orion/user/apps/system/mojoelf.c:1196: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1197: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1198: undefined reference to `assert'
ld: mojoelf.o: in function `map_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:629: undefined reference to `mmap'
ld: mojoelf.o: in function `add_exported_symbol':
/home/tyson/Orion/user/apps/system/mojoelf.c:1096: undefined reference to `strlen'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1100: undefined reference to `strcpy'
ld: mojoelf.o: in function `build_export_list':
/home/tyson/Orion/user/apps/system/mojoelf.c:1165: undefined reference to `assert'
ld: mojoelf.o: in function `fixup_jmprel':
/home/tyson/Orion/user/apps/system/mojoelf.c:1073: undefined reference to `assert'
ld: mojoelf.o: in function `protect_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:675: undefined reference to `mprotect'
ld: mojoelf.o: in function `load_external_dependencies':
/home/tyson/Orion/user/apps/system/mojoelf.c:905: undefined reference to `assert'
ld: mojoelf.o: in function `MOJOELF_dlopen_file':
/home/tyson/Orion/user/apps/system/mojoelf.c:1311: undefined reference to `open'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1316: undefined reference to `fstat'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1320: undefined reference to `read'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1324: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1321: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1315: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1317: undefined reference to `__error'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror_r':
/home/tyson/Orion/user/lib/linux/strerror.c:91: undefined reference to `sys_nerr'
ld: ../../lib/liblinux.a(strerror.o): in function `errstr':
/home/tyson/Orion/user/lib/linux/strerror.c:77: undefined reference to `__uprefix'
ld: /home/tyson/Orion/user/lib/linux/strerror.c:78: undefined reference to `strlcat'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror_r':
/home/tyson/Orion/user/lib/linux/strerror.c:101: undefined reference to `sys_errlist'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror':
/home/tyson/Orion/user/lib/linux/strerror.c:125: undefined reference to `__error'
ld: syslaunch: hidden symbol `__uprefix' isn't defined
ld: final link failed: bad value
make: *** [../../Mk/l4.prog.mk:54: syslaunch] Error 1

[vmlemon]

Status is now:

===> Linking ./syslaunch
ld -e_start -N -L../../lib -L/usr/lib/gcc/x86_64-linux-gnu/8 -nostdlib  -melf_x86_64  -Ttext=01000000 crt0-amd64.o syslaunch.o mojoelf.o    -ll4 -lio  -llinux  -lgcc -o syslaunch
ld: mojoelf.o: in function `MOJOELF_dlclose':
/home/tyson/Orion/user/apps/system/mojoelf.c:1293: undefined reference to `munmap'
ld: mojoelf.o: in function `MOJOELF_dlopen_mem':
/home/tyson/Orion/user/apps/system/mojoelf.c:1196: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1197: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1198: undefined reference to `assert'
ld: mojoelf.o: in function `map_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:629: undefined reference to `mmap'
ld: mojoelf.o: in function `build_export_list':
/home/tyson/Orion/user/apps/system/mojoelf.c:1165: undefined reference to `assert'
ld: mojoelf.o: in function `fixup_jmprel':
/home/tyson/Orion/user/apps/system/mojoelf.c:1073: undefined reference to `assert'
ld: mojoelf.o: in function `protect_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:675: undefined reference to `mprotect'
ld: mojoelf.o: in function `load_external_dependencies':
/home/tyson/Orion/user/apps/system/mojoelf.c:905: undefined reference to `assert'
ld: mojoelf.o: in function `MOJOELF_dlopen_file':
/home/tyson/Orion/user/apps/system/mojoelf.c:1311: undefined reference to `open'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1316: undefined reference to `fstat'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1320: undefined reference to `read'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1324: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1321: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1315: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1317: undefined reference to `__error'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror_r':
/home/tyson/Orion/user/lib/linux/strerror.c:91: undefined reference to `sys_nerr'
ld: ../../lib/liblinux.a(strerror.o): in function `errstr':
/home/tyson/Orion/user/lib/linux/strerror.c:77: undefined reference to `__uprefix'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror_r':
/home/tyson/Orion/user/lib/linux/strerror.c:101: undefined reference to `sys_errlist'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror':
/home/tyson/Orion/user/lib/linux/strerror.c:125: undefined reference to `__error'
ld: syslaunch: hidden symbol `__uprefix' isn't defined
ld: final link failed: bad value
make: *** [../../Mk/l4.prog.mk:54: syslaunch] Error 1
tyson@tyson-Lenovo-ideapad-120S-14IAP:~/Orion/user/apps/system$ 

[vmlemon]

The current status is :

===> Linking ./syslaunch
ld -e_start -N -L../../lib -L/usr/lib/gcc/x86_64-linux-gnu/8 -nostdlib  -melf_x86_64  -Ttext=01000000 crt0-amd64.o syslaunch.o mojoelf.o    -ll4 -lio  -llinux  -lgcc -o syslaunch
ld: mojoelf.o: in function `MOJOELF_dlclose':
/home/tyson/Orion/user/apps/system/mojoelf.c:1293: undefined reference to `munmap'
ld: mojoelf.o: in function `MOJOELF_dlopen_mem':
/home/tyson/Orion/user/apps/system/mojoelf.c:1196: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1197: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1198: undefined reference to `assert'
ld: mojoelf.o: in function `map_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:629: undefined reference to `mmap'
ld: mojoelf.o: in function `build_export_list':
/home/tyson/Orion/user/apps/system/mojoelf.c:1165: undefined reference to `assert'
ld: mojoelf.o: in function `fixup_jmprel':
/home/tyson/Orion/user/apps/system/mojoelf.c:1073: undefined reference to `assert'
ld: mojoelf.o: in function `protect_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:675: undefined reference to `mprotect'
ld: mojoelf.o: in function `load_external_dependencies':
/home/tyson/Orion/user/apps/system/mojoelf.c:905: undefined reference to `assert'
ld: mojoelf.o: in function `MOJOELF_dlopen_file':
/home/tyson/Orion/user/apps/system/mojoelf.c:1311: undefined reference to `open'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1320: undefined reference to `read'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1324: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1321: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1315: undefined reference to `__error'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1317: undefined reference to `__error'
ld: ../../lib/liblinux.a(fstat.o): in function `fstat':
/home/tyson/Orion/user/lib/linux/fstat.c:44: undefined reference to `files'
ld: /home/tyson/Orion/user/lib/linux/fstat.c:57: undefined reference to `__error'
ld: /home/tyson/Orion/user/lib/linux/fstat.c:58: undefined reference to `__error'
ld: /home/tyson/Orion/user/lib/linux/fstat.c:47: undefined reference to `__error'
ld: /home/tyson/Orion/user/lib/linux/fstat.c:53: undefined reference to `__error'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror_r':
/home/tyson/Orion/user/lib/linux/strerror.c:91: undefined reference to `sys_nerr'
ld: ../../lib/liblinux.a(strerror.o): in function `errstr':
/home/tyson/Orion/user/lib/linux/strerror.c:77: undefined reference to `__uprefix'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror_r':
/home/tyson/Orion/user/lib/linux/strerror.c:101: undefined reference to `sys_errlist'
ld: ../../lib/liblinux.a(strerror.o): in function `strerror':
/home/tyson/Orion/user/lib/linux/strerror.c:125: undefined reference to `__error'
ld: syslaunch: hidden symbol `__uprefix' isn't defined
ld: final link failed: bad value
make: *** [../../Mk/l4.prog.mk:54: syslaunch] Error 1

[vmlemon]

Linkage status:

===> Linking ./syslaunch
ld -e_start -N -L../../lib -L/usr/lib/gcc/x86_64-linux-gnu/8 -nostdlib  -melf_x86_64  -Ttext=01000000 crt0-amd64.o syslaunch.o mojoelf.o    -ll4 -lio  -llinux  -lgcc -o syslaunch
ld: mojoelf.o: in function `MOJOELF_dlclose':
/home/tyson/Orion/user/apps/system/mojoelf.c:1293: undefined reference to `munmap'
ld: mojoelf.o: in function `MOJOELF_dlopen_mem':
/home/tyson/Orion/user/apps/system/mojoelf.c:1196: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1197: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1198: undefined reference to `assert'
ld: mojoelf.o: in function `map_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:629: undefined reference to `mmap'
ld: mojoelf.o: in function `build_export_list':
/home/tyson/Orion/user/apps/system/mojoelf.c:1165: undefined reference to `assert'
ld: mojoelf.o: in function `fixup_jmprel':
/home/tyson/Orion/user/apps/system/mojoelf.c:1073: undefined reference to `assert'
ld: mojoelf.o: in function `protect_pages':
/home/tyson/Orion/user/apps/system/mojoelf.c:675: undefined reference to `mprotect'
ld: mojoelf.o: in function `load_external_dependencies':
/home/tyson/Orion/user/apps/system/mojoelf.c:905: undefined reference to `assert'
ld: mojoelf.o: in function `MOJOELF_dlopen_file':
/home/tyson/Orion/user/apps/system/mojoelf.c:1311: undefined reference to `open'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1320: undefined reference to `read'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1324: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1330: undefined reference to `close'
ld: ../../lib/liblinux.a(fstat.o): in function `fstat':
/home/tyson/Orion/user/lib/linux/fstat.c:44: undefined reference to `files'
make: *** [../../Mk/l4.prog.mk:54: syslaunch] Error 1

[vmlemon]

Current status is now :

===> Linking ./syslaunch
ld -e_start -N -L../../lib -L/usr/lib/gcc/x86_64-linux-gnu/8 -nostdlib  -melf_x86_64  -Ttext=01000000 crt0-amd64.o syslaunch.o mojoelf.o    -ll4 -lio  -llinux  -lgcc -o syslaunch
ld: mojoelf.o: in function `MOJOELF_dlopen_mem':
/home/tyson/Orion/user/apps/system/mojoelf.c:1205: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1206: undefined reference to `assert'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1207: undefined reference to `assert'
ld: mojoelf.o: in function `build_export_list':
/home/tyson/Orion/user/apps/system/mojoelf.c:1174: undefined reference to `assert'
ld: mojoelf.o: in function `fixup_jmprel':
/home/tyson/Orion/user/apps/system/mojoelf.c:1082: undefined reference to `assert'
ld: mojoelf.o:/home/tyson/Orion/user/apps/system/mojoelf.c:914: more undefined references to `assert' follow
ld: mojoelf.o: in function `MOJOELF_dlopen_file':
/home/tyson/Orion/user/apps/system/mojoelf.c:1320: undefined reference to `open'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1329: undefined reference to `read'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1333: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1339: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1339: undefined reference to `close'
ld: ../../lib/liblinux.a(fstat.o): in function `fstat':
/home/tyson/Orion/user/lib/linux/fstat.c:44: undefined reference to `files'
make: *** [../../Mk/l4.prog.mk:54: syslaunch] Error 1

We need to properly implement mprotect/mmap/munmap, later, instead of just implementing stubs.

[vmlemon]

Now we're at :

===> Linking ./syslaunch
ld -e_start -N -L../../lib -L/usr/lib/gcc/x86_64-linux-gnu/8 -nostdlib  -melf_x86_64  -Ttext=01000000 crt0-amd64.o syslaunch.o mojoelf.o    -ll4 -lio  -llinux  -lgcc -o syslaunch
ld: mojoelf.o: in function `MOJOELF_dlopen_file':
/home/tyson/Orion/user/apps/system/mojoelf.c:1320: undefined reference to `open'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1329: undefined reference to `read'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1333: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1339: undefined reference to `close'
ld: /home/tyson/Orion/user/apps/system/mojoelf.c:1339: undefined reference to `close'
ld: ../../lib/liblinux.a(fstat.o): in function `fstat':
/home/tyson/Orion/user/lib/linux/fstat.c:44: undefined reference to `files'
ld: ../../lib/liblinux.a(panic.o): in function `panic_action':
/home/tyson/Orion/user/lib/linux/panic.c:50: undefined reference to `getchar'
ld: /home/tyson/Orion/user/lib/linux/panic.c:52: undefined reference to `exit'
ld: ../../lib/liblinux.a(vprintf.o): in function `vprintf':
/home/tyson/Orion/user/lib/linux/vprintf.c:52: undefined reference to `__stdoutp'
ld: ../../lib/liblinux.a(vprintf.o): in function `vprintf_l':
/home/tyson/Orion/user/lib/linux/vprintf.c:57: undefined reference to `__stdoutp'
ld: ../../lib/liblinux.a(vprintf.o): in function `vprintf':
/home/tyson/Orion/user/lib/linux/vprintf.c:52: undefined reference to `vfprintf'
ld: ../../lib/liblinux.a(vprintf.o): in function `vprintf_l':
/home/tyson/Orion/user/lib/linux/vprintf.c:57: undefined reference to `vfprintf_l'
make: *** [../../Mk/l4.prog.mk:54: syslaunch] Error 1