425 lines
11 KiB
C
425 lines
11 KiB
C
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#include <types.h>
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#include <core.h>
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#include <spinlock.h>
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#include <link.h>
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#include <mm.h>
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#include <slab.h>
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#include <pe.h>
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static inline bool IsPowerOf2(u32_t val)
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{
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if(val == 0)
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return false;
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return (val & (val - 1)) == 0;
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}
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static inline void sec_copy(addr_t dst, addr_t src, size_t len)
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{
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u32_t tmp;
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__asm__ __volatile__ (
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"shrl $2, %%ecx \n\t"
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"rep movsl"
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:"=c"(tmp),"=S"(tmp),"=D"(tmp)
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:"c"(len),"S"(src),"D"(dst)
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:"cc");
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};
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static inline void sec_clear(addr_t dst, size_t len)
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{
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u32_t tmp;
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__asm__ __volatile__ (
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"xorl %%eax, %%eax \n\t"
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"rep stosb"
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:"=c"(tmp),"=D"(tmp)
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:"c"(len),"D"(dst)
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:"eax","cc");
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};
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int __stdcall strncmp(const char *s1, const char *s2, size_t n);
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bool link_image(addr_t img_base);
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/*
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void* __fastcall load_pe(const char *path)
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{
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md_t *md;
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md = load_image(path);
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if( md )
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return (void*)md->base;
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return NULL;
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};
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*/
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bool validate_pe(void *raw, size_t raw_size, bool is_exec)
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{
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PIMAGE_DOS_HEADER dos;
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PIMAGE_NT_HEADERS32 nt;
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dos = (PIMAGE_DOS_HEADER)raw;
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if( !raw || raw_size < sizeof(IMAGE_DOS_HEADER) )
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return false;
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if( dos->e_magic != IMAGE_DOS_SIGNATURE || dos->e_lfanew <= 0)
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return false;
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nt = MakePtr( PIMAGE_NT_HEADERS32, dos, dos->e_lfanew);
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if( (addr_t)nt < (addr_t)raw)
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return false;
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if(nt->Signature != IMAGE_NT_SIGNATURE)
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return false;
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if(nt->FileHeader.Machine != IMAGE_FILE_MACHINE_I386)
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return false;
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if(is_exec && (nt->FileHeader.Characteristics & IMAGE_FILE_DLL))
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return false;
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if(nt->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR32_MAGIC)
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return false;
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if( is_exec && nt->OptionalHeader.ImageBase != 0)
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return false;
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if(nt->OptionalHeader.SectionAlignment < PAGE_SIZE)
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{
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if(nt->OptionalHeader.FileAlignment != nt->OptionalHeader.SectionAlignment)
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return false;
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}
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else if(nt->OptionalHeader.SectionAlignment < nt->OptionalHeader.FileAlignment)
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return false;
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if(!IsPowerOf2(nt->OptionalHeader.SectionAlignment) ||
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!IsPowerOf2(nt->OptionalHeader.FileAlignment))
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return false;
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if(nt->FileHeader.NumberOfSections > 96)
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return false;
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return true;
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}
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addr_t __fastcall load_image(const char *path)
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{
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PIMAGE_DOS_HEADER dos;
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PIMAGE_NT_HEADERS32 nt;
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// md_t *img_md;
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size_t img_size;
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addr_t img_base;
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count_t img_pages;
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size_t raw_size = 0;
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void *raw;
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DBG("\nload image %s", path);
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raw = load_file(path, &raw_size);
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DBG(" raw = %x\n", raw);
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if( ! raw)
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{
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DBG("file not found: %s\n", path);
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return NULL;
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};
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if( ! validate_pe(raw, raw_size, false) )
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{
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DBG("invalid pe file %s\n", path);
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mem_free(raw);
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return NULL;
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}
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dos = (PIMAGE_DOS_HEADER)raw;
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nt = MakePtr( PIMAGE_NT_HEADERS32, dos, dos->e_lfanew);
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img_size = nt->OptionalHeader.SizeOfImage;
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// img_md = md_alloc(img_size, PG_SW);
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img_base = mem_alloc(img_size, PG_SW);
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if( !img_base)
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{
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mem_free(raw);
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return NULL;
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};
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// img_base = img_md->base;
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create_image(img_base, (addr_t)raw, true);
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mem_free(raw);
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// dos = (PIMAGE_DOS_HEADER)img_base;
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// nt = MakePtr( PIMAGE_NT_HEADERS32, dos, dos->e_lfanew);
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return img_base;
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};
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/*
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addr_t get_proc_addr(addr_t module, char *name)
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{
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PIMAGE_DOS_HEADER expdos;
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PIMAGE_NT_HEADERS32 expnt;
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PIMAGE_EXPORT_DIRECTORY exp;
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u32_t *functions;
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char **funcname;
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int ind;
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expdos = (PIMAGE_DOS_HEADER)module;
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expnt = MakePtr( PIMAGE_NT_HEADERS32, expdos, expdos->e_lfanew);
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exp = MakePtr(PIMAGE_EXPORT_DIRECTORY,module,
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expnt->OptionalHeader.DataDirectory[0].VirtualAddress);
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functions = MakePtr(DWORD*,exp->AddressOfFunctions,module);
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funcname = MakePtr(char**,exp->AddressOfNames,module);
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for(ind=0; *funcname;funcname++,ind++)
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{
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if(!strcmp(name,MakePtr(char*,*funcname,module)))
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return functions[ind] + module;
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};
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return -1;
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};
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*/
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void create_image(addr_t img_base, addr_t raw, bool force_clear)
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{
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PIMAGE_DOS_HEADER dos;
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PIMAGE_NT_HEADERS32 nt;
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PIMAGE_SECTION_HEADER img_sec;
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u32_t sec_align;
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int i;
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/* assumed that image is valid */
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dos = (PIMAGE_DOS_HEADER)raw;
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nt = MakePtr( PIMAGE_NT_HEADERS32, dos, dos->e_lfanew);
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sec_copy(img_base, raw, nt->OptionalHeader.SizeOfHeaders);
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img_sec = MakePtr(PIMAGE_SECTION_HEADER, nt, sizeof(IMAGE_NT_HEADERS32));
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sec_align = nt->OptionalHeader.SectionAlignment;
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for(i=0; i< nt->FileHeader.NumberOfSections; i++)
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{
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addr_t src_ptr;
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addr_t dest_ptr;
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size_t sec_size;
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src_ptr = MakePtr(addr_t, raw, img_sec->PointerToRawData);
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dest_ptr = MakePtr(addr_t,img_base, img_sec->VirtualAddress);
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if(img_sec->SizeOfRawData)
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sec_copy(dest_ptr, src_ptr, img_sec->SizeOfRawData);
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if(force_clear)
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{
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sec_size = (img_sec->Misc.VirtualSize + sec_align -1) & -sec_align;
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if(sec_size > img_sec->SizeOfRawData)
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sec_clear(dest_ptr + img_sec->SizeOfRawData,
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sec_size - img_sec->SizeOfRawData);
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};
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img_sec++;
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};
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if(nt->OptionalHeader.DataDirectory[5].Size)
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{
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PIMAGE_BASE_RELOCATION reloc;
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/* FIXME addr_t */
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u32_t delta = (u32_t)img_base - nt->OptionalHeader.ImageBase;
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reloc = MakePtr(PIMAGE_BASE_RELOCATION, img_base,
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nt->OptionalHeader.DataDirectory[5].VirtualAddress);
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while ( reloc->SizeOfBlock != 0 )
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{
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u32_t cnt;
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u16_t *entry;
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u16_t reltype;
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u32_t offs;
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cnt = (reloc->SizeOfBlock - sizeof(*reloc))/sizeof(u16_t);
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entry = MakePtr( u16_t*, reloc, sizeof(*reloc) );
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for ( i=0; i < cnt; i++ )
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{
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u16_t *p16;
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u32_t *p32;
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reltype = (*entry & 0xF000) >> 12;
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offs = (*entry & 0x0FFF) + reloc->VirtualAddress;
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switch(reltype)
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{
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case 1:
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p16 = MakePtr(u16_t*, img_base, offs);
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*p16+= (u16_t)(delta>>16);
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break;
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case 2:
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p16 = MakePtr(u16_t*, img_base, offs);
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*p16+= (u16_t)delta;
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break;
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case 3:
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p32 = MakePtr(u32_t*, img_base, offs);
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*p32+= delta;
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}
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entry++;
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}
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reloc = MakePtr(PIMAGE_BASE_RELOCATION, reloc,reloc->SizeOfBlock);
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}
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};
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DBG("\ncreate pe base %x, size %x, %d sections\n\n",img_base,
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nt->OptionalHeader.SizeOfImage, nt->FileHeader.NumberOfSections);
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};
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bool link_image(addr_t img_base)
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{
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PIMAGE_DOS_HEADER dos;
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PIMAGE_NT_HEADERS32 nt;
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int warn = 0;
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/* assumed that image is valid */
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dos = (PIMAGE_DOS_HEADER)img_base;
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nt = MakePtr( PIMAGE_NT_HEADERS32, dos, dos->e_lfanew);
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if(nt->OptionalHeader.DataDirectory[1].Size)
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{
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PIMAGE_IMPORT_DESCRIPTOR imp;
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imp = MakePtr(PIMAGE_IMPORT_DESCRIPTOR, img_base,
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nt->OptionalHeader.DataDirectory[1].VirtualAddress);
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while ( 1 )
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{
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PIMAGE_THUNK_DATA32 thunk;
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PIMAGE_DOS_HEADER expdos;
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PIMAGE_NT_HEADERS32 expnt;
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PIMAGE_EXPORT_DIRECTORY exp;
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u32_t *iat;
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char *libname;
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addr_t *functions;
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u16_t *ordinals;
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char **funcname;
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dll_t *exp_dll;
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if ( (imp->TimeDateStamp==0 ) && (imp->Name==0) )
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break;
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libname=MakePtr(char*,imp->Name, img_base);
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DBG("import from %s\n",libname);
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exp_dll = find_dll(&core_dll.link, libname);
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if(exp_dll != NULL)
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{
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DBG("find %s\n", exp_dll->img_name);
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}
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else
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{
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DBG("can't find %s\n", libname);
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return false;
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}
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exp = exp_dll->img_exp;
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functions = MakePtr(DWORD*,exp->AddressOfFunctions,exp_dll->img_base);
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ordinals = MakePtr(WORD*, exp->AddressOfNameOrdinals,exp_dll->img_base);
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funcname = MakePtr(char**, exp->AddressOfNames,exp_dll->img_base);
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thunk = MakePtr(PIMAGE_THUNK_DATA32,
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imp->Characteristics, img_base);
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iat= MakePtr(DWORD*,imp->FirstThunk, img_base);
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while ( 1 ) // Loop forever (or until we break out)
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{
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PIMAGE_IMPORT_BY_NAME ord;
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addr_t addr;
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if ( thunk->u1.AddressOfData == 0 )
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break;
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if ( thunk->u1.Ordinal & IMAGE_ORDINAL_FLAG )
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{
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// printf(" %4u\n", thunk->u1.Ordinal & 0xFFFF);
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break;
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}
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else
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{
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ord = MakePtr(PIMAGE_IMPORT_BY_NAME,
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thunk->u1.AddressOfData, img_base);
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*iat=0;
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DBG("import %s", ord->Name);
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if(strncmp(ord->Name,
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MakePtr(char*,funcname[ord->Hint],exp_dll->img_base),32))
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{
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int ind;
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char **names=funcname;
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for(names = funcname,ind = 0;
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ind < exp->NumberOfNames; names++,ind++)
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{
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if(!strncmp(ord->Name,MakePtr(char*,*names,exp_dll->img_base),32))
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{
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u16_t ordinal;
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ordinal = ordinals[ind];
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DBG(" \t\tat %x\n", functions[ordinal] + exp_dll->img_base);
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*iat = functions[ordinal] + exp_dll->img_base;
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break;
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};
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};
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if(ind == exp->NumberOfNames)
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{
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DBG(" unresolved import %s\n",ord->Name);
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warn=1;
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};
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}
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else
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{
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DBG(" \tat %x\n", functions[ord->Hint] + exp_dll->img_base);
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*iat = functions[ord->Hint] + exp_dll->img_base;
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};
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};
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thunk++; // Advance to next thunk
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iat++;
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}
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imp++; // advance to next IMAGE_IMPORT_DESCRIPTOR
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};
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};
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if ( !warn )
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return true;
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else
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return false;
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}
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