forked from KolibriOS/kolibrios
291 lines
6.5 KiB
C
291 lines
6.5 KiB
C
/*
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* TCCMEOS.C - KolibriOS/MenuetOS file output for the TinyC Compiler
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*
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* Copyright (c) 2006 Andrey Khalyavin
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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typedef struct {
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char magic[8];
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int version;
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int entry_point;
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int image_size;
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int memory_size;
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int stack;
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int params;
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int argv;
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} IMAGE_MEOS_FILE_HEADER,*PIMAGE_MEOS_FILE_HEADER;
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typedef struct _meos_section_info{
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int sh_addr;
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void* data;
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int data_size;
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int sec_num;
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struct _meos_section_info* next;
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} meos_section_info;
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typedef struct {
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TCCState* s1;
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IMAGE_MEOS_FILE_HEADER header;
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meos_section_info* code_sections;
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meos_section_info* data_sections;
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meos_section_info* bss_sections;
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} me_info;
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meos_section_info* findsection(me_info* me,int num)
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{
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meos_section_info* si;
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for(si=me->code_sections;si;si=si->next)
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{
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if (si->sec_num==num)
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return si;
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}
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for (si=me->data_sections;si;si=si->next)
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{
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if (si->sec_num==num)
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return si;
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}
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for (si=me->bss_sections;si;si=si->next)
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{
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if (si->sec_num==num)
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return si;
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}
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return (meos_section_info*)0;
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}
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void build_reloc(me_info* me)
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{
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int flag;
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Elf32_Rel *rel, *rel_, *rel_end;
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Section *sr;
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meos_section_info* s;
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meos_section_info* ss;
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s=me->code_sections;
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rel=0;
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rel_end=0;
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flag=0;
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for(;;)
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{
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sr=me->s1->sections[s->sec_num]->reloc;
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if (sr)
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{
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rel = (Elf32_Rel *) sr->data;
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rel_end = (Elf32_Rel *) (sr->data + sr->data_offset);
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}
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rel_=rel;
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while (rel_<rel_end){
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rel=rel_;
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int type = ELF32_R_TYPE(rel->r_info);
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rel_=rel+1;
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if (type != R_386_PC32 && type != R_386_32)
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continue;
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int sym = ELF32_R_SYM(rel->r_info);
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if (sym>symtab_section->data_offset/sizeof(Elf32_Sym))
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continue;
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Elf32_Sym* esym = ((Elf32_Sym *)symtab_section->data)+sym;
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int sect=esym->st_shndx;
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ss=findsection(me,sect);
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if (ss==0)
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{
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const char *sym_name = strtab_section->data + esym->st_name;
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tcc_error_noabort("undefined symbol '%s'", sym_name);
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continue;
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}
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if (rel->r_offset>s->data_size)
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continue;
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if (type==R_386_PC32)
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*(int*)(rel->r_offset+s->data)+=ss->sh_addr+esym->st_value-rel->r_offset-s->sh_addr;
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else if (type==R_386_32)
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*(int*)(rel->r_offset+s->data)+=ss->sh_addr+esym->st_value;
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}
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rel=rel_;
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s=s->next;
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if (s==0)
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{
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if (flag) break;
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s=me->data_sections;
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if (s==0) break;
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flag=1;
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continue;
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}
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}
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}
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void assign_addresses(me_info* me)
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{
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int i;
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meos_section_info* si;
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for (i=1;i<me->s1->nb_sections;i++)
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{
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Section* s=me->s1->sections[i];
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if (strcmp(".text",s->name)==0)
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{
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si=tcc_malloc(sizeof(meos_section_info));
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si->data=s->data;
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si->data_size=s->data_offset;
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si->next=me->code_sections;
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si->sec_num=i;
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me->code_sections=si;
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continue;
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}
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if (strcmp(".data",s->name)==0)
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{
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si=tcc_malloc(sizeof(meos_section_info));
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si->data=s->data;
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si->data_size=s->data_offset;
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si->next=me->data_sections;
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si->sec_num=i;
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me->data_sections=si;
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continue;
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}
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if (strcmp(".bss",s->name)==0)
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{
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si=tcc_malloc(sizeof(meos_section_info));
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si->data_size=s->data_offset;
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si->next=me->bss_sections;
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si->sec_num=i;
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me->bss_sections=si;
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continue;
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}
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}
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int addr;
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addr=sizeof(IMAGE_MEOS_FILE_HEADER);
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for (si=me->code_sections;si;si=si->next)
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{
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si->sh_addr=addr;
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addr+=si->data_size;
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}
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for (si=me->data_sections;si;si=si->next)
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{
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si->sh_addr=addr;
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addr+=si->data_size;
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}
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me->header.image_size=addr;
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for (si=me->bss_sections;si;si=si->next)
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{
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si->sh_addr=addr;
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addr+=si->data_size;
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}
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addr+=4096;
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addr=(addr+4)&(~3);
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me->header.stack=addr;
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me->header.memory_size=addr;
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build_reloc(me);
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}
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const char *tcc_get_symbol_name(int st_name)
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// return string by index from stringtable section
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{
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const char *sym_name = strtab_section->data + st_name;
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return sym_name;
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}
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int tcc_find_symbol_me(me_info* me, const char *sym_name)
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{
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int i;
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int symtab;
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int strtab;
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symtab=0;
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strtab=0;
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for (i=1;i<me->s1->nb_sections;i++)
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{
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Section* s;
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s=me->s1->sections[i];
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if (strcmp(s->name,".symtab")==0)
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{
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symtab=i;
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}
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if (strcmp(s->name,".strtab")==0)
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{
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strtab=i;
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}
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}
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if (symtab==0 || strtab==0)
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{
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tcc_error_noabort("undefined sections .symtab or .strtab on linking '%s'", sym_name);
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return 0;
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}
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Elf32_Sym* s,*se;
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char* name;
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s=(Elf32_Sym*)me->s1->sections[symtab]->data;
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se=(Elf32_Sym*)(((void*)s)+me->s1->sections[symtab]->data_offset);
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name=(char*)me->s1->sections[strtab]->data;
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while (s<se)
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{
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if (strcmp(name+s->st_name,sym_name)==0)
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{
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return s->st_value+findsection(me,s->st_shndx)->sh_addr;
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}
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s++;
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}
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tcc_error_noabort("undefined symbol '%s'", sym_name);
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return 0;
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}
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const char* me_magic="MENUET01";
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int tcc_output_me(TCCState* s1,const char *filename)
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{
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me_info me;
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int i;
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FILE* f;
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//printf("%d\n",s1->nb_sections);
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memset(&me,0,sizeof(me));
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me.s1=s1;
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relocate_common_syms();
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assign_addresses(&me);
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me.header.entry_point=tcc_find_symbol_me(&me,"start");
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me.header.params= tcc_find_symbol_me(&me,"__argv"); // <--
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me.header.argv= tcc_find_symbol_me(&me,"__path"); // <--
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f=fopen(filename,"wb");
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for (i=0;i<8;i++)
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me.header.magic[i]=me_magic[i];
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/*me.header.magic[0]='M';me.header.magic[1]='E';
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me.header.magic[2]='N';me.header.magic[3]='U';
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me.header.magic[4]='E';me.header.magic[5]='T';
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me.header.magic[6]='0';me.header.magic[7]='1';*/
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fwrite(&me.header,1,sizeof(IMAGE_MEOS_FILE_HEADER),f);
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meos_section_info* si;
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for(si=me.code_sections;si;si=si->next)
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fwrite(si->data,1,si->data_size,f);
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for (si=me.data_sections;si;si=si->next)
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fwrite(si->data,1,si->data_size,f);
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fclose(f);
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return 0;
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}
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#ifndef _WIN32
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static inline int get_current_folder(char* buf, int bufsize){
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register int val;
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asm volatile ("int $0x40":"=a"(val):"a"(30), "b"(2), "c"(buf), "d"(bufsize));
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return val;
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}
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char *getcwd(char *buf, size_t size)
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{
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int rc = get_current_folder(buf, size);
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if (rc > size)
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{
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errno = ERANGE;
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return 0;
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}
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else
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return buf;
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}
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#endif
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