pcsx2/fps2bios/kernel/eeload/eeelf.c

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#include "romdir.h"
#include "eedebug.h"
typedef struct {
u8 e_ident[16]; //0x7f,"ELF" (ELF file identifier)
u16 e_type; //ELF type: 0=NONE, 1=REL, 2=EXEC, 3=SHARED, 4=CORE
u16 e_machine; //Processor: 8=MIPS R3000
u32 e_version; //Version: 1=current
u32 e_entry; //Entry point address
u32 e_phoff; //Start of program headers (offset from file start)
u32 e_shoff; //Start of section headers (offset from file start)
u32 e_flags; //Processor specific flags = 0x20924001 noreorder, mips
u16 e_ehsize; //ELF header size (0x34 = 52 bytes)
u16 e_phentsize; //Program headers entry size
u16 e_phnum; //Number of program headers
u16 e_shentsize; //Section headers entry size
u16 e_shnum; //Number of section headers
u16 e_shstrndx; //Section header stringtable index
} ELF_HEADER;
typedef struct {
u32 p_type; //see notes1
u32 p_offset; //Offset from file start to program segment.
u32 p_vaddr; //Virtual address of the segment
u32 p_paddr; //Physical address of the segment
u32 p_filesz; //Number of bytes in the file image of the segment
u32 p_memsz; //Number of bytes in the memory image of the segment
u32 p_flags; //Flags for segment
u32 p_align; //Alignment. The address of 0x08 and 0x0C must fit this alignment. 0=no alignment
} ELF_PHR;
/*
notes1
------
0=Inactive
1=Load the segment into memory, no. of bytes specified by 0x10 and 0x14
2=Dynamic linking
3=Interpreter. The array element must specify a path name
4=Note. The array element must specify the location and size of aux. info
5=reserved
6=The array element must specify location and size of the program header table.
*/
typedef struct {
u32 sh_name; //No. to the index of the Section header stringtable index
u32 sh_type; //See notes2
u32 sh_flags; //see notes3
u32 sh_addr; //Section start address
u32 sh_offset; //Offset from start of file to section
u32 sh_size; //Size of section
u32 sh_link; //Section header table index link
u32 sh_info; //Info
u32 sh_addralign; //Alignment. The adress of 0x0C must fit this alignment. 0=no alignment.
u32 sh_entsize; //Fixed size entries.
} ELF_SHR;
/*
notes 2
-------
Type:
0=Inactive
1=PROGBITS
2=SYMTAB symbol table
3=STRTAB string table
4=RELA relocation entries
5=HASH hash table
6=DYNAMIC dynamic linking information
7=NOTE
8=NOBITS
9=REL relocation entries
10=SHLIB
0x70000000=LOPROC processor specifc
0x7fffffff=HIPROC
0x80000000=LOUSER lower bound
0xffffffff=HIUSER upper bound
notes 3
-------
Section Flags: (1 bit, you may combine them like 3 = alloc & write permission)
1=Write section contains data the is be writeable during execution.
2=Alloc section occupies memory during execution
4=Exec section contains executable instructions
0xf0000000=Mask bits processor-specific
*/
typedef struct {
u32 st_name;
u32 st_value;
u32 st_size;
u8 st_info;
u8 st_other;
u16 st_shndx;
} Elf32_Sym;
#define ELF32_ST_TYPE(i) ((i)&0xf)
typedef struct {
u32 r_offset;
u32 r_info;
} Elf32_Rel;
char *sections_names;
ELF_HEADER *elfHeader;
ELF_PHR *elfProgH;
ELF_SHR *elfSectH;
u8 *elfdata;
int elfsize;
static void __memcpy(void *dest, const void *src, int n) {
const u8 *s = (u8*)src;
u8 *d = (u8*)dest;
while (n) {
*d++ = *s++; n--;
}
}
int loadHeaders() {
elfHeader = (ELF_HEADER*)elfdata;
if ((elfHeader->e_shentsize != sizeof(ELF_SHR)) && (elfHeader->e_shnum > 0)) {
return -1;
}
#ifdef ELF_LOG
ELF_LOG( "type: " );
#endif
switch( elfHeader->e_type )
{
default:
#ifdef ELF_LOG
ELF_LOG( "unknown %x", elfHeader->e_type );
#endif
break;
case 0x0:
#ifdef ELF_LOG
ELF_LOG( "no file type" );
#endif
break;
case 0x1:
#ifdef ELF_LOG
ELF_LOG( "relocatable" );
#endif
break;
case 0x2:
#ifdef ELF_LOG
ELF_LOG( "executable" );
#endif
break;
}
#ifdef ELF_LOG
ELF_LOG( "\n" );
ELF_LOG( "machine: " );
#endif
switch ( elfHeader->e_machine )
{
default:
#ifdef ELF_LOG
ELF_LOG( "unknown" );
#endif
break;
case 0x8:
#ifdef ELF_LOG
ELF_LOG( "mips_rs3000" );
#endif
break;
}
#ifdef ELF_LOG
ELF_LOG("\n");
ELF_LOG("version: %d\n",elfHeader->e_version);
ELF_LOG("entry: %08x\n",elfHeader->e_entry);
ELF_LOG("flags: %08x\n",elfHeader->e_flags);
ELF_LOG("eh size: %08x\n",elfHeader->e_ehsize);
ELF_LOG("ph off: %08x\n",elfHeader->e_phoff);
ELF_LOG("ph entsiz: %08x\n",elfHeader->e_phentsize);
ELF_LOG("ph num: %08x\n",elfHeader->e_phnum);
ELF_LOG("sh off: %08x\n",elfHeader->e_shoff);
ELF_LOG("sh entsiz: %08x\n",elfHeader->e_shentsize);
ELF_LOG("sh num: %08x\n",elfHeader->e_shnum);
ELF_LOG("sh strndx: %08x\n",elfHeader->e_shstrndx);
ELF_LOG("\n");
#endif
return 0;
}
int loadProgramHeaders() {
int i;
if (elfHeader->e_phnum == 0) {
return 0;
}
if (elfHeader->e_phentsize != sizeof(ELF_PHR)) {
return -1;
}
elfProgH = (ELF_PHR*)&elfdata[elfHeader->e_phoff];
for ( i = 0 ; i < elfHeader->e_phnum ; i++ )
{
#ifdef ELF_LOG
ELF_LOG( "Elf32 Program Header\n" );
ELF_LOG( "type: " );
#endif
switch ( elfProgH[ i ].p_type )
{
default:
#ifdef ELF_LOG
ELF_LOG( "unknown %x", (int)elfProgH[ i ].p_type );
#endif
break;
case 0x1:
#ifdef ELF_LOG
ELF_LOG("load");
#endif
/* if ( elfHeader->e_shnum == 0 ) {*/
if (elfProgH[ i ].p_offset < elfsize) {
int size;
if ((elfProgH[ i ].p_filesz + elfProgH[ i ].p_offset) > elfsize) {
size = elfsize - elfProgH[ i ].p_offset;
} else {
size = elfProgH[ i ].p_filesz;
}
// __printf("loading program to %x\n", elfProgH[ i ].p_paddr + elfbase);
__memcpy(elfProgH[ i ].p_paddr,
&elfdata[elfProgH[ i ].p_offset],
size);
}
#ifdef ELF_LOG
ELF_LOG("\t*LOADED*");
#endif
// }
break;
}
#ifdef ELF_LOG
ELF_LOG("\n");
ELF_LOG("offset: %08x\n",(int)elfProgH[i].p_offset);
ELF_LOG("vaddr: %08x\n",(int)elfProgH[i].p_vaddr);
ELF_LOG("paddr: %08x\n",elfProgH[i].p_paddr);
ELF_LOG("file size: %08x\n",elfProgH[i].p_filesz);
ELF_LOG("mem size: %08x\n",elfProgH[i].p_memsz);
ELF_LOG("flags: %08x\n",elfProgH[i].p_flags);
ELF_LOG("palign: %08x\n",elfProgH[i].p_align);
ELF_LOG("\n");
#endif
}
return 0;
}
int loadSectionHeaders() {
int i;
int i_st = -1;
int i_dt = -1;
if (elfHeader->e_shnum == 0) {
return -1;
}
elfSectH = (ELF_SHR*)&elfdata[elfHeader->e_shoff];
if ( elfHeader->e_shstrndx < elfHeader->e_shnum ) {
sections_names = (char *)&elfdata[elfSectH[ elfHeader->e_shstrndx ].sh_offset];
}
for ( i = 0 ; i < elfHeader->e_shnum ; i++ )
{
#ifdef ELF_LOG
ELF_LOG( "Elf32 Section Header [%x] %s", i, &sections_names[ elfSectH[ i ].sh_name ] );
#endif
/* if ( elfSectH[i].sh_flags & 0x2 ) {
if (elfSectH[i].sh_offset < elfsize) {
int size;
if ((elfSectH[i].sh_size + elfSectH[i].sh_offset) > elfsize) {
size = elfsize - elfSectH[i].sh_offset;
} else {
size = elfSectH[i].sh_size;
}
memcpy(&psM[ elfSectH[ i ].sh_addr &0x1ffffff ],
&elfdata[elfSectH[i].sh_offset],
size);
}
#ifdef ELF_LOG
ELF_LOG( "\t*LOADED*" );
#endif
}*/
#ifdef ELF_LOG
ELF_LOG("\n");
ELF_LOG("type: ");
#endif
switch ( elfSectH[ i ].sh_type )
{
default:
#ifdef ELF_LOG
ELF_LOG("unknown %08x",elfSectH[i].sh_type);
#endif
break;
case 0x0:
#ifdef ELF_LOG
ELF_LOG("null");
#endif
break;
case 0x1:
#ifdef ELF_LOG
ELF_LOG("progbits");
#endif
break;
case 0x2:
#ifdef ELF_LOG
ELF_LOG("symtab");
#endif
break;
case 0x3:
#ifdef ELF_LOG
ELF_LOG("strtab");
#endif
break;
case 0x4:
#ifdef ELF_LOG
ELF_LOG("rela");
#endif
break;
case 0x8:
#ifdef ELF_LOG
ELF_LOG("no bits");
#endif
break;
case 0x9:
#ifdef ELF_LOG
ELF_LOG("rel");
#endif
break;
}
#ifdef ELF_LOG
ELF_LOG("\n");
ELF_LOG("flags: %08x\n", elfSectH[i].sh_flags);
ELF_LOG("addr: %08x\n", elfSectH[i].sh_addr);
ELF_LOG("offset: %08x\n", elfSectH[i].sh_offset);
ELF_LOG("size: %08x\n", elfSectH[i].sh_size);
ELF_LOG("link: %08x\n", elfSectH[i].sh_link);
ELF_LOG("info: %08x\n", elfSectH[i].sh_info);
ELF_LOG("addralign: %08x\n", elfSectH[i].sh_addralign);
ELF_LOG("entsize: %08x\n", elfSectH[i].sh_entsize);
#endif
// dump symbol table
if (elfSectH[i].sh_type == 0x02) {
i_st = i; i_dt = elfSectH[i].sh_link;
}
/*
if (elfSectH[i].sh_type == 0x01) {
int size = elfSectH[i].sh_size / 4;
u32 *ptr = (u32*)&psxM[(elfSectH[i].sh_addr + irx_addr) & 0x1fffff];
while (size) {
if (*ptr == 0x41e00000) { // import func
int ret = iopSetImportFunc(ptr+1);
size-= ret; ptr+= ret;
}
if (*ptr == 0x41c00000) { // export func
int ret = iopSetExportFunc(ptr+1);
size-= ret; ptr+= ret;
}
size--; ptr++;
}
}
*/
/* if (!strcmp(".data", &sections_names[elfSectH[i].sh_name])) {
// seems so..
psxRegs.GPR.n.gp = 0x8000 + irx_addr + elfSectH[i].sh_addr;
}*/
}
return 0;
}
u32 loadElfFile(char *filename, struct elfinfo *info) {
struct rominfo ri;
char str[256];
char str2[256];
int i;
__printf("loadElfFile: %s\n", filename);
if (romdirGetFile(filename, &ri) == NULL) {
__printf("file %s not found!!\n", filename);
return -1;
}
elfdata = (u8*)(0xbfc00000 + ri.fileOffset);
elfsize = ri.fileSize;
loadHeaders();
loadProgramHeaders();
loadSectionHeaders();
// __printf("loadElfFile: e_entry=%x\n", elfHeader->e_entry);
return elfHeader->e_entry;
}