903 lines
26 KiB
C
903 lines
26 KiB
C
/*
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* Mach-O object file loading
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*
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* Copyright (c) 2006 Pierre d'Herbemont
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <string.h>
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#include "qemu.h"
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#include "disas.h"
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#include <mach-o/loader.h>
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#include <mach-o/fat.h>
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#include <mach-o/nlist.h>
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#include <mach-o/reloc.h>
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#include <mach-o/ppc/reloc.h>
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//#define DEBUG_MACHLOAD
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#ifdef DEBUG_MACHLOAD
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# define DPRINTF(...) do { qemu_log(__VA_ARGS__); printf(__VA_ARGS__); } while(0)
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#else
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# define DPRINTF(...) do { qemu_log(__VA_ARGS__); } while(0)
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#endif
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# define check_mach_header(x) (x.magic == MH_CIGAM)
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extern const char *interp_prefix;
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/* we don't have a good implementation for this */
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#define DONT_USE_DYLD_SHARED_MAP
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/* Pass extra arg to DYLD for debug */
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//#define ACTIVATE_DYLD_TRACE
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//#define OVERRIDE_DYLINKER
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#ifdef OVERRIDE_DYLINKER
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# ifdef TARGET_I386
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# define DYLINKER_NAME "/Users/steg/qemu/tests/i386-darwin-env/usr/lib/dyld"
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# else
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# define DYLINKER_NAME "/usr/lib/dyld"
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# endif
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#endif
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/* XXX: in an include */
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struct nlist_extended
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{
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union {
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char *n_name;
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long n_strx;
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} n_un;
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unsigned char n_type;
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unsigned char n_sect;
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short st_desc;
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unsigned long st_value;
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unsigned long st_size;
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};
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/* Print symbols in gdb */
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void *macho_text_sect = 0;
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int macho_offset = 0;
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int load_object(const char *filename, struct target_pt_regs * regs, void ** mh);
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void qerror(const char *format, ...);
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#ifdef TARGET_I386
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typedef struct mach_i386_thread_state {
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unsigned int eax;
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unsigned int ebx;
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unsigned int ecx;
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unsigned int edx;
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unsigned int edi;
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unsigned int esi;
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unsigned int ebp;
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unsigned int esp;
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unsigned int ss;
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unsigned int eflags;
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unsigned int eip;
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unsigned int cs;
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unsigned int ds;
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unsigned int es;
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unsigned int fs;
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unsigned int gs;
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} mach_i386_thread_state_t;
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void bswap_i386_thread_state(struct mach_i386_thread_state *ts)
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{
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bswap32s((uint32_t*)&ts->eax);
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bswap32s((uint32_t*)&ts->ebx);
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bswap32s((uint32_t*)&ts->ecx);
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bswap32s((uint32_t*)&ts->edx);
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bswap32s((uint32_t*)&ts->edi);
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bswap32s((uint32_t*)&ts->esi);
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bswap32s((uint32_t*)&ts->ebp);
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bswap32s((uint32_t*)&ts->esp);
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bswap32s((uint32_t*)&ts->ss);
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bswap32s((uint32_t*)&ts->eflags);
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bswap32s((uint32_t*)&ts->eip);
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bswap32s((uint32_t*)&ts->cs);
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bswap32s((uint32_t*)&ts->ds);
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bswap32s((uint32_t*)&ts->es);
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bswap32s((uint32_t*)&ts->fs);
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bswap32s((uint32_t*)&ts->gs);
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}
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#define target_thread_state mach_i386_thread_state
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#define TARGET_CPU_TYPE CPU_TYPE_I386
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#define TARGET_CPU_NAME "i386"
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#endif
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#ifdef TARGET_PPC
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struct mach_ppc_thread_state {
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unsigned int srr0; /* Instruction address register (PC) */
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unsigned int srr1; /* Machine state register (supervisor) */
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unsigned int r0;
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unsigned int r1;
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unsigned int r2;
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unsigned int r3;
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unsigned int r4;
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unsigned int r5;
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unsigned int r6;
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unsigned int r7;
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unsigned int r8;
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unsigned int r9;
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unsigned int r10;
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unsigned int r11;
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unsigned int r12;
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unsigned int r13;
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unsigned int r14;
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unsigned int r15;
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unsigned int r16;
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unsigned int r17;
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unsigned int r18;
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unsigned int r19;
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unsigned int r20;
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unsigned int r21;
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unsigned int r22;
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unsigned int r23;
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unsigned int r24;
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unsigned int r25;
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unsigned int r26;
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unsigned int r27;
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unsigned int r28;
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unsigned int r29;
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unsigned int r30;
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unsigned int r31;
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unsigned int cr; /* Condition register */
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unsigned int xer; /* User's integer exception register */
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unsigned int lr; /* Link register */
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unsigned int ctr; /* Count register */
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unsigned int mq; /* MQ register (601 only) */
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unsigned int vrsave; /* Vector Save Register */
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};
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void bswap_ppc_thread_state(struct mach_ppc_thread_state *ts)
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{
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bswap32s((uint32_t*)&ts->srr0);
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bswap32s((uint32_t*)&ts->srr1);
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bswap32s((uint32_t*)&ts->r0);
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bswap32s((uint32_t*)&ts->r1);
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bswap32s((uint32_t*)&ts->r2);
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bswap32s((uint32_t*)&ts->r3);
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bswap32s((uint32_t*)&ts->r4);
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bswap32s((uint32_t*)&ts->r5);
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bswap32s((uint32_t*)&ts->r6);
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bswap32s((uint32_t*)&ts->r7);
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bswap32s((uint32_t*)&ts->r8);
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bswap32s((uint32_t*)&ts->r9);
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bswap32s((uint32_t*)&ts->r10);
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bswap32s((uint32_t*)&ts->r11);
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bswap32s((uint32_t*)&ts->r12);
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bswap32s((uint32_t*)&ts->r13);
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bswap32s((uint32_t*)&ts->r14);
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bswap32s((uint32_t*)&ts->r15);
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bswap32s((uint32_t*)&ts->r16);
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bswap32s((uint32_t*)&ts->r17);
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bswap32s((uint32_t*)&ts->r18);
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bswap32s((uint32_t*)&ts->r19);
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bswap32s((uint32_t*)&ts->r20);
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bswap32s((uint32_t*)&ts->r21);
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bswap32s((uint32_t*)&ts->r22);
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bswap32s((uint32_t*)&ts->r23);
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bswap32s((uint32_t*)&ts->r24);
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bswap32s((uint32_t*)&ts->r25);
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bswap32s((uint32_t*)&ts->r26);
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bswap32s((uint32_t*)&ts->r27);
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bswap32s((uint32_t*)&ts->r28);
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bswap32s((uint32_t*)&ts->r29);
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bswap32s((uint32_t*)&ts->r30);
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bswap32s((uint32_t*)&ts->r31);
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bswap32s((uint32_t*)&ts->cr);
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bswap32s((uint32_t*)&ts->xer);
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bswap32s((uint32_t*)&ts->lr);
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bswap32s((uint32_t*)&ts->ctr);
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bswap32s((uint32_t*)&ts->mq);
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bswap32s((uint32_t*)&ts->vrsave);
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}
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#define target_thread_state mach_ppc_thread_state
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#define TARGET_CPU_TYPE CPU_TYPE_POWERPC
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#define TARGET_CPU_NAME "PowerPC"
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#endif
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struct target_thread_command {
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unsigned long cmd; /* LC_THREAD or LC_UNIXTHREAD */
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unsigned long cmdsize; /* total size of this command */
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unsigned long flavor; /* flavor of thread state */
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unsigned long count; /* count of longs in thread state */
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struct target_thread_state state; /* thread state for this flavor */
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};
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void bswap_tc(struct target_thread_command *tc)
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{
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bswap32s((uint32_t*)(&tc->flavor));
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bswap32s((uint32_t*)&tc->count);
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#if defined(TARGET_I386)
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bswap_i386_thread_state(&tc->state);
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#elif defined(TARGET_PPC)
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bswap_ppc_thread_state(&tc->state);
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#else
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# error unknown TARGET_CPU_TYPE
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#endif
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}
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void bswap_mh(struct mach_header *mh)
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{
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bswap32s((uint32_t*)(&mh->magic));
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bswap32s((uint32_t*)&mh->cputype);
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bswap32s((uint32_t*)&mh->cpusubtype);
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bswap32s((uint32_t*)&mh->filetype);
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bswap32s((uint32_t*)&mh->ncmds);
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bswap32s((uint32_t*)&mh->sizeofcmds);
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bswap32s((uint32_t*)&mh->flags);
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}
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void bswap_lc(struct load_command *lc)
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{
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bswap32s((uint32_t*)&lc->cmd);
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bswap32s((uint32_t*)&lc->cmdsize);
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}
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void bswap_fh(struct fat_header *fh)
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{
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bswap32s((uint32_t*)&fh->magic);
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bswap32s((uint32_t*)&fh->nfat_arch);
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}
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void bswap_fa(struct fat_arch *fa)
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{
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bswap32s((uint32_t*)&fa->cputype);
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bswap32s((uint32_t*)&fa->cpusubtype);
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bswap32s((uint32_t*)&fa->offset);
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bswap32s((uint32_t*)&fa->size);
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bswap32s((uint32_t*)&fa->align);
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}
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void bswap_segcmd(struct segment_command *sc)
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{
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bswap32s((uint32_t*)&sc->vmaddr);
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bswap32s((uint32_t*)&sc->vmsize);
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bswap32s((uint32_t*)&sc->fileoff);
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bswap32s((uint32_t*)&sc->filesize);
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bswap32s((uint32_t*)&sc->maxprot);
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bswap32s((uint32_t*)&sc->initprot);
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bswap32s((uint32_t*)&sc->nsects);
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bswap32s((uint32_t*)&sc->flags);
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}
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void bswap_symtabcmd(struct symtab_command *stc)
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{
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bswap32s((uint32_t*)&stc->cmd);
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bswap32s((uint32_t*)&stc->cmdsize);
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bswap32s((uint32_t*)&stc->symoff);
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bswap32s((uint32_t*)&stc->nsyms);
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bswap32s((uint32_t*)&stc->stroff);
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bswap32s((uint32_t*)&stc->strsize);
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}
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void bswap_sym(struct nlist *n)
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{
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bswap32s((uint32_t*)&n->n_un.n_strx);
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bswap16s((uint16_t*)&n->n_desc);
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bswap32s((uint32_t*)&n->n_value);
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}
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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)
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{
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int entry;
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if(need_bswap)
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bswap_tc(tc);
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#if defined(TARGET_I386)
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entry = tc->state.eip;
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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",
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tc->state.eax, tc->state.ebx, tc->state.ecx, tc->state.edx, tc->state.edi, tc->state.esi, tc->state.ebp,
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tc->state.esp, tc->state.ss, tc->state.eflags, tc->state.eip, tc->state.cs, tc->state.ds, tc->state.es,
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tc->state.fs, tc->state.gs );
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#define reg_copy(reg) regs->reg = tc->state.reg
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if(regs)
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{
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reg_copy(eax);
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reg_copy(ebx);
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reg_copy(ecx);
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reg_copy(edx);
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reg_copy(edi);
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reg_copy(esi);
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reg_copy(ebp);
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reg_copy(esp);
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reg_copy(eflags);
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reg_copy(eip);
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/*
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reg_copy(ss);
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reg_copy(cs);
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reg_copy(ds);
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reg_copy(es);
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reg_copy(fs);
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reg_copy(gs);*/
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}
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#undef reg_copy
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#elif defined(TARGET_PPC)
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entry = tc->state.srr0;
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#endif
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DPRINTF("load_thread: entry 0x%x\n", entry);
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return entry;
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}
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int load_dylinker(struct mach_header *mh, struct dylinker_command *dc, int fd, int mh_pos, int need_bswap)
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{
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int size;
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char * dylinker_name;
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size = dc->cmdsize - sizeof(struct dylinker_command);
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if(need_bswap)
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dylinker_name = (char*)(bswap_32(dc->name.offset)+(int)dc);
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else
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dylinker_name = (char*)((dc->name.offset)+(int)dc);
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#ifdef OVERRIDE_DYLINKER
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dylinker_name = DYLINKER_NAME;
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#else
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if(asprintf(&dylinker_name, "%s%s", interp_prefix, dylinker_name) == -1)
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qerror("can't allocate the new dylinker name\n");
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#endif
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DPRINTF("dylinker_name %s\n", dylinker_name);
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return load_object(dylinker_name, NULL, NULL);
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}
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int load_segment(struct mach_header *mh, struct segment_command *sc, int fd, int mh_pos, int need_bswap, int fixed, int slide)
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{
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unsigned long addr = sc->vmaddr;
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unsigned long size = sc->filesize;
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unsigned long error = 0;
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if(need_bswap)
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bswap_segcmd(sc);
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if(sc->vmaddr == 0)
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{
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DPRINTF("load_segment: sc->vmaddr == 0 returning\n");
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return -1;
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}
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if (strcmp(sc->segname, "__PAGEZERO") == 0)
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{
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DPRINTF("load_segment: __PAGEZERO returning\n");
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return -1;
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}
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/* Right now mmap memory */
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/* XXX: should check to see that the space is free, because MAP_FIXED is dangerous */
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DPRINTF("load_segment: mmaping %s to 0x%x-(0x%x|0x%x) + 0x%x\n", sc->segname, sc->vmaddr, sc->filesize, sc->vmsize, slide);
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if(sc->filesize > 0)
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{
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int opt = 0;
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if(fixed)
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opt |= MAP_FIXED;
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DPRINTF("sc->vmaddr 0x%x slide 0x%x add 0x%x\n", slide, sc->vmaddr, sc->vmaddr+slide);
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addr = target_mmap(sc->vmaddr+slide, sc->filesize, sc->initprot, opt, fd, mh_pos + sc->fileoff);
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if(addr==-1)
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qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
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error = addr-sc->vmaddr;
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}
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else
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{
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addr = sc->vmaddr+slide;
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error = slide;
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}
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if(sc->vmsize > sc->filesize)
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{
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addr += sc->filesize;
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size = sc->vmsize-sc->filesize;
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addr = target_mmap(addr, size, sc->initprot, MAP_ANONYMOUS | MAP_FIXED, -1, 0);
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if(addr==-1)
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qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
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}
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return error;
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}
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void *load_data(int fd, long offset, unsigned int size)
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{
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char *data;
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data = malloc(size);
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if (!data)
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return NULL;
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lseek(fd, offset, SEEK_SET);
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if (read(fd, data, size) != size) {
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free(data);
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return NULL;
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}
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return data;
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}
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/* load a mach-o object file */
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int load_object(const char *filename, struct target_pt_regs * regs, void ** mh)
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{
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int need_bswap = 0;
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int entry_point = 0;
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int dyld_entry_point = 0;
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int slide, mmapfixed;
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int fd;
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struct load_command *lcmds, *lc;
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int is_fat = 0;
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unsigned int i, magic;
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int mach_hdr_pos = 0;
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struct mach_header mach_hdr;
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/* for symbol lookup whith -d flag. */
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struct symtab_command * symtabcmd = 0;
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struct nlist_extended *symtab, *sym;
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struct nlist *symtab_std, *syment;
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char *strtab;
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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;
|
|
}
|