forked from KolibriOS/kolibrios
495 lines
13 KiB
C
495 lines
13 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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int tcc_output_dbgme(const char *filename, me_info* me);
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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 = 0, *rel_ = 0, *rel_end = 0;
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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) // what about multiple BSS sections ?
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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=s->data;
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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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if (me->s1->pe_stack_size < 4096)
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addr+=4096;
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else
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addr += me->s1->pe_stack_size;
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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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if (s1->do_debug)
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tcc_output_dbgme(filename, &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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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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if (!s1->nobss)
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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->data == NULL)
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{
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// printf("\nError! BSS data is NULL! size:%i",(int)si->data_size);
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si->data = calloc(si->data_size, 1);
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}
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fwrite(si->data, 1, si->data_size, f);
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}
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}
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/*
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if (me.bss_sections) // Siemargl testin, what we lose
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{
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tcc_error_noabort("We lose .BSS section when linking KOS32 executable");
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}
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*/
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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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static FILE *src_file;
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static int next_src_line;
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void close_source_file()
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{
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if (src_file)
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fclose(src_file);
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src_file = NULL;
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}
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void load_source_file(char *fname)
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{
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close_source_file();
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src_file = fopen(fname,"rt");
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if (!src_file) return;
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next_src_line = 1;
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}
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int get_src_lines(char *buf, int sz, int start, int end)
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// 1 if read
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{
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char line[255], *ch;
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strcpy(buf, "");
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if (!src_file) return 0;
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while (next_src_line < start) // skip
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{
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ch = fgets(line, sizeof line, src_file);
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if (!ch) return 0;
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next_src_line++;
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}
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while (next_src_line <= end)
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{
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ch = fgets(line, sizeof line, src_file);
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if (!ch) return 0;
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next_src_line++;
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strncat(buf, line, sz - strlen(buf) - 1);
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}
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// remove newlines
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for (ch = buf; *ch; ch++)
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if (strchr("\t\n\r", *ch)) *ch = ' ';
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return 1;
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}
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int tcc_output_dbgme(const char *filename, me_info* me)
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// by Siemargl. Writes filename.dbg file for source code level debuggin with MTDBG
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// return 1 on error
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{
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FILE *fdbg;
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char fname[400],
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buf[80]; // no more fits in mtdbg string
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strcpy(fname, filename);
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strcat(fname, ".dbg");
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fdbg = fopen(fname,"wt");
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if (!fdbg) return 1;
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meos_section_info *si, *ss;
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fputs(".text\n", fdbg); // just for mtbg
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// print symbol table with resolved addresses
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Elf32_Sym* esym;
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for (esym = (Elf32_Sym*)symtab_section->data; esym <= (Elf32_Sym*)(symtab_section->data + symtab_section->data_offset); esym++)
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{
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if (esym->st_info == 0 || esym->st_info == 4) continue;
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int sect = esym->st_shndx;
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ss = findsection(me, sect);
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const char *sym_name = strtab_section->data + esym->st_name;
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if (ss == 0)
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{
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fprintf(fdbg, "undefined symbol '%s' type(%d)\n", sym_name, esym->st_info);
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continue;
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}
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fprintf(fdbg, "0x%X %s\n", ss->sh_addr + esym->st_value, sym_name); // removed type(%d) esym->st_info
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}
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fputs(".text source code links\n", fdbg); // just for mtbg
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// print symbol table with resolved addresses
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Stab_Sym *stab;
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char *str = "", *cur_file = "???", cur_fun[255];
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int cur_line = 0, cur_fun_addr = 0, fun_flag = 0;
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strcpy(cur_fun, "fn???");
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for (stab = (Stab_Sym*)stab_section->data; stab <= (Stab_Sym*)(stab_section->data + stab_section->data_offset); stab++)
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{
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str = "";
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switch(stab->n_type)
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{
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case 100: // source file, or path
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if (stab->n_strx)
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{
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cur_file = stabstr_section->data + stab->n_strx;
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load_source_file(cur_file);
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}
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else
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cur_file = "???";
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strcpy(cur_fun, "fn???");
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cur_line = 0;
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cur_fun_addr = 0;
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fun_flag = 0;
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break;
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case 36: // func
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cur_fun_addr = 0;
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if (stab->n_strx)
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{
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strcpy(cur_fun, stabstr_section->data + stab->n_strx);
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str = strchr(cur_fun, ':');
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if (str) *str = '\0';
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cur_fun_addr = tcc_find_symbol_me(me, cur_fun);
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cur_line = stab->n_desc;
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fun_flag = 1;
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//fprintf(fdbg, "0x%X %s() line(%d)\n", cur_fun_addr, cur_fun, cur_line); // commented as conflicted with direct address
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}
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else
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strcpy(cur_fun, "fn???");
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break;
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case 68: // N_SLINE
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if (stab->n_value == 0 ) continue; // skip zero offset line
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if (fun_flag) // skip string {, as duplicates address
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{
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fun_flag = 0;
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continue;
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}
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int line;
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if (stab->n_desc > cur_line)
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line = cur_line + 1;
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else
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line = cur_line;
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//fprintf(fdbg, "0x%X LINES %d-%d \n", cur_fun_addr + stab->n_value, line, stab->n_desc);
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if (get_src_lines(buf, sizeof buf, line, stab->n_desc))
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fprintf(fdbg, "0x%X %s\n", cur_fun_addr + stab->n_value, buf);
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cur_line = stab->n_desc;
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break;
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default:
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continue;
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}
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/*
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if (stab->n_strx)
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str = stabstr_section->data + stab->n_strx;
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fprintf(fdbg, "0x%X type(%d) str(%s) desc(%d)\n", stab->n_value, stab->n_type, str, stab->n_desc);
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*/
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}
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/* for(; si; si = si->next)
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{
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Section *sr;
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Elf32_Rel *rel, *rel_end;
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for(sr = me->s1->sections[si->sec_num]->reloc; sr; )
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{
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for (rel = (Elf32_Rel *) sr->data, rel_end = (Elf32_Rel *) (sr->data + sr->data_offset); rel < rel_end; rel++)
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{
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int type = ELF32_R_TYPE(rel->r_info);
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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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const char *sym_name = strtab_section->data + esym->st_name;
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if (ss == 0)
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{
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fprintf(fdbg, "undefined symbol '%s'\n", sym_name);
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continue;
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}
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if (rel->r_offset > si->data_size) continue;
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fprintf(fdbg, "\t0x%X %s\n", ss->sh_addr + esym->st_value, sym_name);
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}
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}
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}
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*/
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close_source_file();
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fclose(fdbg);
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return 0;
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}
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