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qemu/darwin-user/machload.c

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/*
* Mach-O object file loading
*
* Copyright (c) 2006 Pierre d'Herbemont
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
*/
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <string.h>
#include "qemu.h"
#include "disas.h"
#include <mach-o/loader.h>
#include <mach-o/fat.h>
#include <mach-o/nlist.h>
#include <mach-o/reloc.h>
#include <mach-o/ppc/reloc.h>
//#define DEBUG_MACHLOAD
#ifdef DEBUG_MACHLOAD
# define DPRINTF(...) do { if(loglevel) fprintf(logfile, __VA_ARGS__); printf(__VA_ARGS__); } while(0)
#else
# define DPRINTF(...) do { if(loglevel) fprintf(logfile, __VA_ARGS__); } while(0)
#endif
# define check_mach_header(x) (x.magic == MH_CIGAM)
extern const char *interp_prefix;
/* we don't have a good implementation for this */
#define DONT_USE_DYLD_SHARED_MAP
/* Pass extra arg to DYLD for debug */
//#define ACTIVATE_DYLD_TRACE
//#define OVERRIDE_DYLINKER
#ifdef OVERRIDE_DYLINKER
# ifdef TARGET_I386
# define DYLINKER_NAME "/Users/steg/qemu/tests/i386-darwin-env/usr/lib/dyld"
# else
# define DYLINKER_NAME "/usr/lib/dyld"
# endif
#endif
/* XXX: in an include */
struct nlist_extended
{
union {
char *n_name;
long n_strx;
} n_un;
unsigned char n_type;
unsigned char n_sect;
short st_desc;
unsigned long st_value;
unsigned long st_size;
};
/* Print symbols in gdb */
void *macho_text_sect = 0;
int macho_offset = 0;
int load_object(const char *filename, struct target_pt_regs * regs, void ** mh);
void qerror(const char *format, ...);
#ifdef TARGET_I386
typedef struct mach_i386_thread_state {
unsigned int eax;
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
unsigned int edi;
unsigned int esi;
unsigned int ebp;
unsigned int esp;
unsigned int ss;
unsigned int eflags;
unsigned int eip;
unsigned int cs;
unsigned int ds;
unsigned int es;
unsigned int fs;
unsigned int gs;
} mach_i386_thread_state_t;
void bswap_i386_thread_state(struct mach_i386_thread_state *ts)
{
bswap32s((uint32_t*)&ts->eax);
bswap32s((uint32_t*)&ts->ebx);
bswap32s((uint32_t*)&ts->ecx);
bswap32s((uint32_t*)&ts->edx);
bswap32s((uint32_t*)&ts->edi);
bswap32s((uint32_t*)&ts->esi);
bswap32s((uint32_t*)&ts->ebp);
bswap32s((uint32_t*)&ts->esp);
bswap32s((uint32_t*)&ts->ss);
bswap32s((uint32_t*)&ts->eflags);
bswap32s((uint32_t*)&ts->eip);
bswap32s((uint32_t*)&ts->cs);
bswap32s((uint32_t*)&ts->ds);
bswap32s((uint32_t*)&ts->es);
bswap32s((uint32_t*)&ts->fs);
bswap32s((uint32_t*)&ts->gs);
}
#define target_thread_state mach_i386_thread_state
#define TARGET_CPU_TYPE CPU_TYPE_I386
#define TARGET_CPU_NAME "i386"
#endif
#ifdef TARGET_PPC
struct mach_ppc_thread_state {
unsigned int srr0; /* Instruction address register (PC) */
unsigned int srr1; /* Machine state register (supervisor) */
unsigned int r0;
unsigned int r1;
unsigned int r2;
unsigned int r3;
unsigned int r4;
unsigned int r5;
unsigned int r6;
unsigned int r7;
unsigned int r8;
unsigned int r9;
unsigned int r10;
unsigned int r11;
unsigned int r12;
unsigned int r13;
unsigned int r14;
unsigned int r15;
unsigned int r16;
unsigned int r17;
unsigned int r18;
unsigned int r19;
unsigned int r20;
unsigned int r21;
unsigned int r22;
unsigned int r23;
unsigned int r24;
unsigned int r25;
unsigned int r26;
unsigned int r27;
unsigned int r28;
unsigned int r29;
unsigned int r30;
unsigned int r31;
unsigned int cr; /* Condition register */
unsigned int xer; /* User's integer exception register */
unsigned int lr; /* Link register */
unsigned int ctr; /* Count register */
unsigned int mq; /* MQ register (601 only) */
unsigned int vrsave; /* Vector Save Register */
};
void bswap_ppc_thread_state(struct mach_ppc_thread_state *ts)
{
bswap32s((uint32_t*)&ts->srr0);
bswap32s((uint32_t*)&ts->srr1);
bswap32s((uint32_t*)&ts->r0);
bswap32s((uint32_t*)&ts->r1);
bswap32s((uint32_t*)&ts->r2);
bswap32s((uint32_t*)&ts->r3);
bswap32s((uint32_t*)&ts->r4);
bswap32s((uint32_t*)&ts->r5);
bswap32s((uint32_t*)&ts->r6);
bswap32s((uint32_t*)&ts->r7);
bswap32s((uint32_t*)&ts->r8);
bswap32s((uint32_t*)&ts->r9);
bswap32s((uint32_t*)&ts->r10);
bswap32s((uint32_t*)&ts->r11);
bswap32s((uint32_t*)&ts->r12);
bswap32s((uint32_t*)&ts->r13);
bswap32s((uint32_t*)&ts->r14);
bswap32s((uint32_t*)&ts->r15);
bswap32s((uint32_t*)&ts->r16);
bswap32s((uint32_t*)&ts->r17);
bswap32s((uint32_t*)&ts->r18);
bswap32s((uint32_t*)&ts->r19);
bswap32s((uint32_t*)&ts->r20);
bswap32s((uint32_t*)&ts->r21);
bswap32s((uint32_t*)&ts->r22);
bswap32s((uint32_t*)&ts->r23);
bswap32s((uint32_t*)&ts->r24);
bswap32s((uint32_t*)&ts->r25);
bswap32s((uint32_t*)&ts->r26);
bswap32s((uint32_t*)&ts->r27);
bswap32s((uint32_t*)&ts->r28);
bswap32s((uint32_t*)&ts->r29);
bswap32s((uint32_t*)&ts->r30);
bswap32s((uint32_t*)&ts->r31);
bswap32s((uint32_t*)&ts->cr);
bswap32s((uint32_t*)&ts->xer);
bswap32s((uint32_t*)&ts->lr);
bswap32s((uint32_t*)&ts->ctr);
bswap32s((uint32_t*)&ts->mq);
bswap32s((uint32_t*)&ts->vrsave);
}
#define target_thread_state mach_ppc_thread_state
#define TARGET_CPU_TYPE CPU_TYPE_POWERPC
#define TARGET_CPU_NAME "PowerPC"
#endif
struct target_thread_command {
unsigned long cmd; /* LC_THREAD or LC_UNIXTHREAD */
unsigned long cmdsize; /* total size of this command */
unsigned long flavor; /* flavor of thread state */
unsigned long count; /* count of longs in thread state */
struct target_thread_state state; /* thread state for this flavor */
};
void bswap_tc(struct target_thread_command *tc)
{
bswap32s((uint32_t*)(&tc->flavor));
bswap32s((uint32_t*)&tc->count);
#if defined(TARGET_I386)
bswap_i386_thread_state(&tc->state);
#elif defined(TARGET_PPC)
bswap_ppc_thread_state(&tc->state);
#else
# error unknown TARGET_CPU_TYPE
#endif
}
void bswap_mh(struct mach_header *mh)
{
bswap32s((uint32_t*)(&mh->magic));
bswap32s((uint32_t*)&mh->cputype);
bswap32s((uint32_t*)&mh->cpusubtype);
bswap32s((uint32_t*)&mh->filetype);
bswap32s((uint32_t*)&mh->ncmds);
bswap32s((uint32_t*)&mh->sizeofcmds);
bswap32s((uint32_t*)&mh->flags);
}
void bswap_lc(struct load_command *lc)
{
bswap32s((uint32_t*)&lc->cmd);
bswap32s((uint32_t*)&lc->cmdsize);
}
void bswap_fh(struct fat_header *fh)
{
bswap32s((uint32_t*)&fh->magic);
bswap32s((uint32_t*)&fh->nfat_arch);
}
void bswap_fa(struct fat_arch *fa)
{
bswap32s((uint32_t*)&fa->cputype);
bswap32s((uint32_t*)&fa->cpusubtype);
bswap32s((uint32_t*)&fa->offset);
bswap32s((uint32_t*)&fa->size);
bswap32s((uint32_t*)&fa->align);
}
void bswap_segcmd(struct segment_command *sc)
{
bswap32s((uint32_t*)&sc->vmaddr);
bswap32s((uint32_t*)&sc->vmsize);
bswap32s((uint32_t*)&sc->fileoff);
bswap32s((uint32_t*)&sc->filesize);
bswap32s((uint32_t*)&sc->maxprot);
bswap32s((uint32_t*)&sc->initprot);
bswap32s((uint32_t*)&sc->nsects);
bswap32s((uint32_t*)&sc->flags);
}
void bswap_symtabcmd(struct symtab_command *stc)
{
bswap32s((uint32_t*)&stc->cmd);
bswap32s((uint32_t*)&stc->cmdsize);
bswap32s((uint32_t*)&stc->symoff);
bswap32s((uint32_t*)&stc->nsyms);
bswap32s((uint32_t*)&stc->stroff);
bswap32s((uint32_t*)&stc->strsize);
}
void bswap_sym(struct nlist *n)
{
bswap32s((uint32_t*)&n->n_un.n_strx);
bswap16s((uint16_t*)&n->n_desc);
bswap32s((uint32_t*)&n->n_value);
}
int load_thread(struct mach_header *mh, struct target_thread_command *tc, struct target_pt_regs * regs, int fd, int mh_pos, int need_bswap)
{
int entry;
if(need_bswap)
bswap_tc(tc);
#if defined(TARGET_I386)
entry = tc->state.eip;
DPRINTF(" eax 0x%.8x\n ebx 0x%.8x\n ecx 0x%.8x\n edx 0x%.8x\n edi 0x%.8x\n esi 0x%.8x\n ebp 0x%.8x\n esp 0x%.8x\n ss 0x%.8x\n eflags 0x%.8x\n eip 0x%.8x\n cs 0x%.8x\n ds 0x%.8x\n es 0x%.8x\n fs 0x%.8x\n gs 0x%.8x\n",
tc->state.eax, tc->state.ebx, tc->state.ecx, tc->state.edx, tc->state.edi, tc->state.esi, tc->state.ebp,
tc->state.esp, tc->state.ss, tc->state.eflags, tc->state.eip, tc->state.cs, tc->state.ds, tc->state.es,
tc->state.fs, tc->state.gs );
#define reg_copy(reg) regs->reg = tc->state.reg
if(regs)
{
reg_copy(eax);
reg_copy(ebx);
reg_copy(ecx);
reg_copy(edx);
reg_copy(edi);
reg_copy(esi);
reg_copy(ebp);
reg_copy(esp);
reg_copy(eflags);
reg_copy(eip);
/*
reg_copy(ss);
reg_copy(cs);
reg_copy(ds);
reg_copy(es);
reg_copy(fs);
reg_copy(gs);*/
}
#undef reg_copy
#elif defined(TARGET_PPC)
entry = tc->state.srr0;
#endif
DPRINTF("load_thread: entry 0x%x\n", entry);
return entry;
}
int load_dylinker(struct mach_header *mh, struct dylinker_command *dc, int fd, int mh_pos, int need_bswap)
{
int size;
char * dylinker_name;
size = dc->cmdsize - sizeof(struct dylinker_command);
if(need_bswap)
dylinker_name = (char*)(bswap_32(dc->name.offset)+(int)dc);
else
dylinker_name = (char*)((dc->name.offset)+(int)dc);
#ifdef OVERRIDE_DYLINKER
dylinker_name = DYLINKER_NAME;
#else
if(asprintf(&dylinker_name, "%s%s", interp_prefix, dylinker_name) == -1)
qerror("can't allocate the new dylinker name\n");
#endif
DPRINTF("dylinker_name %s\n", dylinker_name);
return load_object(dylinker_name, NULL, NULL);
}
int load_segment(struct mach_header *mh, struct segment_command *sc, int fd, int mh_pos, int need_bswap, int fixed, int slide)
{
unsigned long addr = sc->vmaddr;
unsigned long size = sc->filesize;
unsigned long error = 0;
if(need_bswap)
bswap_segcmd(sc);
if(sc->vmaddr == 0)
{
DPRINTF("load_segment: sc->vmaddr == 0 returning\n");
return -1;
}
if (strcmp(sc->segname, "__PAGEZERO") == 0)
{
DPRINTF("load_segment: __PAGEZERO returning\n");
return -1;
}
/* Right now mmap memory */
/* XXX: should check to see that the space is free, because MAP_FIXED is dangerous */
DPRINTF("load_segment: mmaping %s to 0x%x-(0x%x|0x%x) + 0x%x\n", sc->segname, sc->vmaddr, sc->filesize, sc->vmsize, slide);
if(sc->filesize > 0)
{
int opt = 0;
if(fixed)
opt |= MAP_FIXED;
DPRINTF("sc->vmaddr 0x%x slide 0x%x add 0x%x\n", slide, sc->vmaddr, sc->vmaddr+slide);
addr = target_mmap(sc->vmaddr+slide, sc->filesize, sc->initprot, opt, fd, mh_pos + sc->fileoff);
if(addr==-1)
qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
error = addr-sc->vmaddr;
}
else
{
addr = sc->vmaddr+slide;
error = slide;
}
if(sc->vmsize > sc->filesize)
{
addr += sc->filesize;
size = sc->vmsize-sc->filesize;
addr = target_mmap(addr, size, sc->initprot, MAP_ANONYMOUS | MAP_FIXED, -1, 0);
if(addr==-1)
qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
}
return error;
}
void *load_data(int fd, long offset, unsigned int size)
{
char *data;
data = malloc(size);
if (!data)
return NULL;
lseek(fd, offset, SEEK_SET);
if (read(fd, data, size) != size) {
free(data);
return NULL;
}
return data;
}
/* load a mach-o object file */
int load_object(const char *filename, struct target_pt_regs * regs, void ** mh)
{
int need_bswap = 0;
int entry_point = 0;
int dyld_entry_point = 0;
int slide, mmapfixed;
int fd;
struct load_command *lcmds, *lc;
int is_fat = 0;
unsigned int i, magic;
int mach_hdr_pos = 0;
struct mach_header mach_hdr;
/* for symbol lookup whith -d flag. */
struct symtab_command * symtabcmd = 0;
struct nlist_extended *symtab, *sym;
struct nlist *symtab_std, *syment;
char *strtab;
fd = open(filename, O_RDONLY);
if (fd < 0)
qerror("can't open file '%s'", filename);
/* Read magic header. */
if (read(fd, &magic, sizeof (magic)) != sizeof (magic))
qerror("unable to read Magic of '%s'", filename);
/* Check Mach identification. */
if(magic == MH_MAGIC)
{
is_fat = 0;
need_bswap = 0;
} else if (magic == MH_CIGAM)
{
is_fat = 0;
need_bswap = 1;
} else if (magic == FAT_MAGIC)
{
is_fat = 1;
need_bswap = 0;
} else if (magic == FAT_CIGAM)
{
is_fat = 1;
need_bswap = 1;
}
else
qerror("Not a Mach-O file.", filename);
DPRINTF("loading %s %s...\n", filename, is_fat ? "[FAT]": "[REGULAR]");
if(is_fat)
{
int found = 0;
struct fat_header fh;
struct fat_arch *fa;
lseek(fd, 0, SEEK_SET);
/* Read Fat header. */
if (read(fd, &fh, sizeof (fh)) != sizeof (fh))
qerror("unable to read file header");
if(need_bswap)
bswap_fh(&fh);
/* Read Fat Arch. */
fa = malloc(sizeof(struct fat_arch)*fh.nfat_arch);
if (read(fd, fa, sizeof(struct fat_arch)*fh.nfat_arch) != sizeof(struct fat_arch)*fh.nfat_arch)
qerror("unable to read file header");
for( i = 0; i < fh.nfat_arch; i++, fa++)
{
if(need_bswap)
bswap_fa(fa);
if(fa->cputype == TARGET_CPU_TYPE)
{
mach_hdr_pos = fa->offset;
lseek(fd, mach_hdr_pos, SEEK_SET);
/* Read Mach header. */
if (read(fd, &mach_hdr, sizeof(struct mach_header)) != sizeof (struct mach_header))
qerror("unable to read file header");
if(mach_hdr.magic == MH_MAGIC)
need_bswap = 0;
else if (mach_hdr.magic == MH_CIGAM)
need_bswap = 1;
else
qerror("Invalid mach header in Fat Mach-O File");
found = 1;
break;
}
}
if(!found)
qerror("%s: No %s CPU found in FAT Header", filename, TARGET_CPU_NAME);
}
else
{
lseek(fd, 0, SEEK_SET);
/* Read Mach header */
if (read(fd, &mach_hdr, sizeof (mach_hdr)) != sizeof (mach_hdr))
qerror("%s: unable to read file header", filename);
}
if(need_bswap)
bswap_mh(&mach_hdr);
if ((mach_hdr.cputype) != TARGET_CPU_TYPE)
qerror("%s: Unsupported CPU 0x%x (only 0x%x(%s) supported)", filename, mach_hdr.cputype, TARGET_CPU_TYPE, TARGET_CPU_NAME);
switch(mach_hdr.filetype)
{
case MH_EXECUTE: break;
case MH_FVMLIB:
case MH_DYLIB:
case MH_DYLINKER: break;
default:
qerror("%s: Unsupported Mach type (0x%x)", filename, mach_hdr.filetype);
}
/* read segment headers */
lcmds = malloc(mach_hdr.sizeofcmds);
if(read(fd, lcmds, mach_hdr.sizeofcmds) != mach_hdr.sizeofcmds)
qerror("%s: unable to read load_command", filename);
slide = 0;
mmapfixed = 0;
for(i=0, lc = lcmds; i < (mach_hdr.ncmds) ; i++)
{
if(need_bswap)
bswap_lc(lc);
switch(lc->cmd)
{
case LC_SEGMENT:
/* The main_exe can't be relocated */
if(mach_hdr.filetype == MH_EXECUTE)
mmapfixed = 1;
slide = load_segment(&mach_hdr, (struct segment_command*)lc, fd, mach_hdr_pos, need_bswap, mmapfixed, slide);
/* other segment must be mapped according to slide exactly, if load_segment did something */
if(slide != -1)
mmapfixed = 1;
else
slide = 0; /* load_segment didn't map the segment */
if(mach_hdr.filetype == MH_EXECUTE && slide != 0)
qerror("%s: Warning executable can't be mapped at the right address (offset: 0x%x)\n", filename, slide);
if(strcmp(((struct segment_command*)(lc))->segname, "__TEXT") == 0)
{
/* Text section */
if(mach_hdr.filetype == MH_EXECUTE)
{
/* return the mach_header */
*mh = (void*)(((struct segment_command*)(lc))->vmaddr + slide);
}
else
{
/* it is dyld save the section for gdb, we will be interested in dyld symbol
while debuging */
macho_text_sect = (void*)(((struct segment_command*)(lc))->vmaddr + slide);
macho_offset = slide;
}
}
break;
case LC_LOAD_DYLINKER:
dyld_entry_point = load_dylinker( &mach_hdr, (struct dylinker_command*)lc, fd, mach_hdr_pos, need_bswap );
break;
case LC_LOAD_DYLIB:
/* dyld will do that for us */
break;
case LC_THREAD:
case LC_UNIXTHREAD:
{
struct target_pt_regs * _regs;
if(mach_hdr.filetype == MH_DYLINKER)
_regs = regs;
else
_regs = 0;
entry_point = load_thread( &mach_hdr, (struct target_thread_command*)lc, _regs, fd, mach_hdr_pos, need_bswap );
}
break;
case LC_SYMTAB:
/* Save the symtab and strtab */
symtabcmd = (struct symtab_command *)lc;
break;
case LC_ID_DYLINKER:
case LC_ID_DYLIB:
case LC_UUID:
case LC_DYSYMTAB:
case LC_TWOLEVEL_HINTS:
case LC_PREBIND_CKSUM:
case LC_SUB_LIBRARY:
break;
default: fprintf(stderr, "warning: unkown command 0x%x in '%s'\n", lc->cmd, filename);
}
lc = (struct load_command*)((int)(lc)+(lc->cmdsize));
}
if(symtabcmd)
{
if(need_bswap)
bswap_symtabcmd(symtabcmd);
symtab_std = load_data(fd, symtabcmd->symoff+mach_hdr_pos, symtabcmd->nsyms * sizeof(struct nlist));
strtab = load_data(fd, symtabcmd->stroff+mach_hdr_pos, symtabcmd->strsize);
symtab = malloc(sizeof(struct nlist_extended) * symtabcmd->nsyms);
if(need_bswap)
{
for(i = 0, syment = symtab_std; i < symtabcmd->nsyms; i++, syment++)
bswap_sym(syment);
}
for(i = 0, sym = symtab, syment = symtab_std; i < symtabcmd->nsyms; i++, sym++, syment++)
{
struct nlist *sym_follow, *sym_next = 0;
unsigned int j;
memset(sym, 0, sizeof(*sym));
sym->n_type = syment->n_type;
if ( syment->n_type & N_STAB ) /* Debug symbols are skipped */
continue;
memcpy(sym, syment, sizeof(*syment));
/* Find the following symbol in order to get the current symbol size */
for(j = 0, sym_follow = symtab_std; j < symtabcmd->nsyms; j++, sym_follow++) {
if ( sym_follow->n_type & N_STAB || !(sym_follow->n_value > sym->st_value))
continue;
if(!sym_next) {
sym_next = sym_follow;
continue;
}
if(!(sym_next->n_value > sym_follow->n_value))
continue;
sym_next = sym_follow;
}
if(sym_next)
sym->st_size = sym_next->n_value - sym->st_value;
else
sym->st_size = 10; /* XXX: text_sec_hdr->size + text_sec_hdr->offset - sym->st_value; */
sym->st_value += slide;
}
free((void*)symtab_std);
{
DPRINTF("saving symtab of %s (%d symbol(s))\n", filename, symtabcmd->nsyms);
struct syminfo *s;
s = malloc(sizeof(*s));
s->disas_symtab = symtab;
s->disas_strtab = strtab;
s->disas_num_syms = symtabcmd->nsyms;
s->next = syminfos;
syminfos = s;
}
}
close(fd);
if(mach_hdr.filetype == MH_EXECUTE && dyld_entry_point)
return dyld_entry_point;
else
return entry_point+slide;
}
extern unsigned long stack_size;
unsigned long setup_arg_pages(void * mh, char ** argv, char ** env)
{
unsigned long stack_base, error, size;
int i;
int * stack;
int argc, envc;
/* Create enough stack to hold everything. If we don't use
* it for args, we'll use it for something else...
*/
size = stack_size;
error = target_mmap(0,
size + qemu_host_page_size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
if (error == -1)
qerror("stk mmap");
/* we reserve one extra page at the top of the stack as guard */
target_mprotect(error + size, qemu_host_page_size, PROT_NONE);
stack_base = error + size;
stack = (void*)stack_base;
/*
* | STRING AREA |
* +-------------+
* | 0 |
* +-------------+
* | apple[n] |
* +-------------+
* :
* +-------------+
* | apple[0] |
* +-------------+
* | 0 |
* +-------------+
* | env[n] |
* +-------------+
* :
* :
* +-------------+
* | env[0] |
* +-------------+
* | 0 |
* +-------------+
* | arg[argc-1] |
* +-------------+
* :
* :
* +-------------+
* | arg[0] |
* +-------------+
* | argc |
* +-------------+
* sp-> | mh | address of where the a.out's file offset 0 is in memory
* +-------------+
*/
/* Construct the stack Stack grows down */
stack--;
/* XXX: string should go up there */
*stack = 0;
stack--;
/* Push the absolute path of our executable */
DPRINTF("pushing apple %s (0x%x)\n", (char*)argv[0], (int)argv[0]);
stl(stack, (int) argv[0]);
stack--;
stl(stack, 0);
stack--;
/* Get envc */
for(envc = 0; env[envc]; envc++);
for(i = envc-1; i >= 0; i--)
{
DPRINTF("pushing env %s (0x%x)\n", (char*)env[i], (int)env[i]);
stl(stack, (int)env[i]);
stack--;
/* XXX: remove that when string will be on top of the stack */
page_set_flags((int)env[i], (int)(env[i]+strlen(env[i])), PROT_READ | PAGE_VALID);
}
/* Add on the stack the interp_prefix choosen if so */
if(interp_prefix[0])
{
char *dyld_root;
asprintf(&dyld_root, "DYLD_ROOT_PATH=%s", interp_prefix);
page_set_flags((int)dyld_root, (int)(dyld_root+strlen(interp_prefix)+1), PROT_READ | PAGE_VALID);
stl(stack, (int)dyld_root);
stack--;
}
#ifdef DONT_USE_DYLD_SHARED_MAP
{
char *shared_map_mode;
asprintf(&shared_map_mode, "DYLD_SHARED_REGION=avoid");
page_set_flags((int)shared_map_mode, (int)(shared_map_mode+strlen(shared_map_mode)+1), PROT_READ | PAGE_VALID);
stl(stack, (int)shared_map_mode);
stack--;
}
#endif
#ifdef ACTIVATE_DYLD_TRACE
char * extra_env_static[] = {"DYLD_DEBUG_TRACE=yes",
"DYLD_PREBIND_DEBUG=3", "DYLD_UNKNOW_TRACE=yes",
"DYLD_PRINT_INITIALIZERS=yes",
"DYLD_PRINT_SEGMENTS=yes", "DYLD_PRINT_REBASINGS=yes", "DYLD_PRINT_BINDINGS=yes", "DYLD_PRINT_INITIALIZERS=yes", "DYLD_PRINT_WARNINGS=yes" };
char ** extra_env = malloc(sizeof(extra_env_static));
bcopy(extra_env_static, extra_env, sizeof(extra_env_static));
page_set_flags((int)extra_env, (int)((void*)extra_env+sizeof(extra_env_static)), PROT_READ | PAGE_VALID);
for(i = 0; i<9; i++)
{
DPRINTF("pushing (extra) env %s (0x%x)\n", (char*)extra_env[i], (int)extra_env[i]);
stl(stack, (int) extra_env[i]);
stack--;
}
#endif
stl(stack, 0);
stack--;
/* Get argc */
for(argc = 0; argv[argc]; argc++);
for(i = argc-1; i >= 0; i--)
{
DPRINTF("pushing arg %s (0x%x)\n", (char*)argv[i], (int)argv[i]);
stl(stack, (int) argv[i]);
stack--;
/* XXX: remove that when string will be on top of the stack */
page_set_flags((int)argv[i], (int)(argv[i]+strlen(argv[i])), PROT_READ | PAGE_VALID);
}
DPRINTF("pushing argc %d \n", argc);
stl(stack, argc);
stack--;
DPRINTF("pushing mh 0x%x \n", (int)mh);
stl(stack, (int) mh);
/* Stack points on the mh */
return (unsigned long)stack;
}
int mach_exec(const char * filename, char ** argv, char ** envp,
struct target_pt_regs * regs)
{
int entrypoint, stack;
void * mh; /* the Mach Header that will be used by dyld */
DPRINTF("mach_exec at 0x%x\n", (int)mach_exec);
entrypoint = load_object(filename, regs, &mh);
stack = setup_arg_pages(mh, argv, envp);
#if defined(TARGET_I386)
regs->eip = entrypoint;
regs->esp = stack;
#elif defined(TARGET_PPC)
regs->nip = entrypoint;
regs->gpr[1] = stack;
#endif
DPRINTF("mach_exec returns eip set to 0x%x esp 0x%x mh 0x%x\n", entrypoint, stack, (int)mh);
if(!entrypoint)
qerror("%s: no entry point!\n", filename);
return 0;
}
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