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/*
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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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#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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|
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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); |
363 |
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#ifdef OVERRIDE_DYLINKER
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dylinker_name = DYLINKER_NAME; |
366 |
#else
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if(asprintf(&dylinker_name, "%s%s", interp_prefix, dylinker_name) == -1) |
368 |
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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} |
374 |
|
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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) |
376 |
{ |
377 |
unsigned long addr = sc->vmaddr; |
378 |
unsigned long size = sc->filesize; |
379 |
unsigned long error = 0; |
380 |
|
381 |
if(need_bswap)
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bswap_segcmd(sc); |
383 |
|
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if(sc->vmaddr == 0) |
385 |
{ |
386 |
DPRINTF("load_segment: sc->vmaddr == 0 returning\n");
|
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return -1; |
388 |
} |
389 |
|
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if (strcmp(sc->segname, "__PAGEZERO") == 0) |
391 |
{ |
392 |
DPRINTF("load_segment: __PAGEZERO returning\n");
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return -1; |
394 |
} |
395 |
|
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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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|
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if(sc->filesize > 0) |
401 |
{ |
402 |
int opt = 0; |
403 |
|
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if(fixed)
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opt |= MAP_FIXED; |
406 |
|
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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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|
409 |
addr = target_mmap(sc->vmaddr+slide, sc->filesize, sc->initprot, opt, fd, mh_pos + sc->fileoff); |
410 |
|
411 |
if(addr==-1) |
412 |
qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
|
413 |
|
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error = addr-sc->vmaddr; |
415 |
} |
416 |
else
|
417 |
{ |
418 |
addr = sc->vmaddr+slide; |
419 |
error = slide; |
420 |
} |
421 |
|
422 |
if(sc->vmsize > sc->filesize)
|
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{ |
424 |
addr += sc->filesize; |
425 |
size = sc->vmsize-sc->filesize; |
426 |
addr = target_mmap(addr, size, sc->initprot, MAP_ANONYMOUS | MAP_FIXED, -1, 0); |
427 |
if(addr==-1) |
428 |
qerror("load_segment: can't mmap at 0x%x\n", sc->vmaddr+slide);
|
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} |
430 |
|
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return error;
|
432 |
} |
433 |
|
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void *load_data(int fd, long offset, unsigned int size) |
435 |
{ |
436 |
char *data;
|
437 |
|
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data = malloc(size); |
439 |
if (!data)
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return NULL; |
441 |
lseek(fd, offset, SEEK_SET); |
442 |
if (read(fd, data, size) != size) {
|
443 |
free(data); |
444 |
return NULL; |
445 |
} |
446 |
return data;
|
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} |
448 |
|
449 |
/* load a mach-o object file */
|
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int load_object(const char *filename, struct target_pt_regs * regs, void ** mh) |
451 |
{ |
452 |
int need_bswap = 0; |
453 |
int entry_point = 0; |
454 |
int dyld_entry_point = 0; |
455 |
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; |
459 |
unsigned int i, magic; |
460 |
int mach_hdr_pos = 0; |
461 |
struct mach_header mach_hdr;
|
462 |
|
463 |
/* for symbol lookup whith -d flag. */
|
464 |
struct symtab_command * symtabcmd = 0; |
465 |
struct nlist_extended *symtab, *sym;
|
466 |
struct nlist *symtab_std, *syment;
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char *strtab;
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468 |
|
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fd = open(filename, O_RDONLY); |
470 |
if (fd < 0) |
471 |
qerror("can't open file '%s'", filename);
|
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|
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/* Read magic header. */
|
474 |
if (read(fd, &magic, sizeof (magic)) != sizeof (magic)) |
475 |
qerror("unable to read Magic of '%s'", filename);
|
476 |
|
477 |
/* Check Mach identification. */
|
478 |
if(magic == MH_MAGIC)
|
479 |
{ |
480 |
is_fat = 0;
|
481 |
need_bswap = 0;
|
482 |
} else if (magic == MH_CIGAM) |
483 |
{ |
484 |
is_fat = 0;
|
485 |
need_bswap = 1;
|
486 |
} else if (magic == FAT_MAGIC) |
487 |
{ |
488 |
is_fat = 1;
|
489 |
need_bswap = 0;
|
490 |
} else if (magic == FAT_CIGAM) |
491 |
{ |
492 |
is_fat = 1;
|
493 |
need_bswap = 1;
|
494 |
} |
495 |
else
|
496 |
qerror("Not a Mach-O file.", filename);
|
497 |
|
498 |
DPRINTF("loading %s %s...\n", filename, is_fat ? "[FAT]": "[REGULAR]"); |
499 |
if(is_fat)
|
500 |
{ |
501 |
int found = 0; |
502 |
struct fat_header fh;
|
503 |
struct fat_arch *fa;
|
504 |
|
505 |
lseek(fd, 0, SEEK_SET);
|
506 |
|
507 |
/* Read Fat header. */
|
508 |
if (read(fd, &fh, sizeof (fh)) != sizeof (fh)) |
509 |
qerror("unable to read file header");
|
510 |
|
511 |
if(need_bswap)
|
512 |
bswap_fh(&fh); |
513 |
|
514 |
/* Read Fat Arch. */
|
515 |
fa = malloc(sizeof(struct fat_arch)*fh.nfat_arch); |
516 |
|
517 |
if (read(fd, fa, sizeof(struct fat_arch)*fh.nfat_arch) != sizeof(struct fat_arch)*fh.nfat_arch) |
518 |
qerror("unable to read file header");
|
519 |
|
520 |
for( i = 0; i < fh.nfat_arch; i++, fa++) |
521 |
{ |
522 |
if(need_bswap)
|
523 |
bswap_fa(fa); |
524 |
if(fa->cputype == TARGET_CPU_TYPE)
|
525 |
{ |
526 |
mach_hdr_pos = fa->offset; |
527 |
lseek(fd, mach_hdr_pos, SEEK_SET); |
528 |
|
529 |
/* Read Mach header. */
|
530 |
|
531 |
if (read(fd, &mach_hdr, sizeof(struct mach_header)) != sizeof (struct mach_header)) |
532 |
qerror("unable to read file header");
|
533 |
|
534 |
if(mach_hdr.magic == MH_MAGIC)
|
535 |
need_bswap = 0;
|
536 |
else if (mach_hdr.magic == MH_CIGAM) |
537 |
need_bswap = 1;
|
538 |
else
|
539 |
qerror("Invalid mach header in Fat Mach-O File");
|
540 |
found = 1;
|
541 |
break;
|
542 |
} |
543 |
} |
544 |
if(!found)
|
545 |
qerror("%s: No %s CPU found in FAT Header", filename, TARGET_CPU_NAME);
|
546 |
} |
547 |
else
|
548 |
{ |
549 |
lseek(fd, 0, SEEK_SET);
|
550 |
/* Read Mach header */
|
551 |
if (read(fd, &mach_hdr, sizeof (mach_hdr)) != sizeof (mach_hdr)) |
552 |
qerror("%s: unable to read file header", filename);
|
553 |
} |
554 |
|
555 |
if(need_bswap)
|
556 |
bswap_mh(&mach_hdr); |
557 |
|
558 |
if ((mach_hdr.cputype) != TARGET_CPU_TYPE)
|
559 |
qerror("%s: Unsupported CPU 0x%x (only 0x%x(%s) supported)", filename, mach_hdr.cputype, TARGET_CPU_TYPE, TARGET_CPU_NAME);
|
560 |
|
561 |
|
562 |
switch(mach_hdr.filetype)
|
563 |
{ |
564 |
case MH_EXECUTE: break; |
565 |
case MH_FVMLIB:
|
566 |
case MH_DYLIB:
|
567 |
case MH_DYLINKER: break; |
568 |
default:
|
569 |
qerror("%s: Unsupported Mach type (0x%x)", filename, mach_hdr.filetype);
|
570 |
} |
571 |
|
572 |
/* read segment headers */
|
573 |
lcmds = malloc(mach_hdr.sizeofcmds); |
574 |
|
575 |
if(read(fd, lcmds, mach_hdr.sizeofcmds) != mach_hdr.sizeofcmds)
|
576 |
qerror("%s: unable to read load_command", filename);
|
577 |
slide = 0;
|
578 |
mmapfixed = 0;
|
579 |
for(i=0, lc = lcmds; i < (mach_hdr.ncmds) ; i++) |
580 |
{ |
581 |
|
582 |
if(need_bswap)
|
583 |
bswap_lc(lc); |
584 |
switch(lc->cmd)
|
585 |
{ |
586 |
case LC_SEGMENT:
|
587 |
/* The main_exe can't be relocated */
|
588 |
if(mach_hdr.filetype == MH_EXECUTE)
|
589 |
mmapfixed = 1;
|
590 |
|
591 |
slide = load_segment(&mach_hdr, (struct segment_command*)lc, fd, mach_hdr_pos, need_bswap, mmapfixed, slide);
|
592 |
|
593 |
/* other segment must be mapped according to slide exactly, if load_segment did something */
|
594 |
if(slide != -1) |
595 |
mmapfixed = 1;
|
596 |
else
|
597 |
slide = 0; /* load_segment didn't map the segment */ |
598 |
|
599 |
if(mach_hdr.filetype == MH_EXECUTE && slide != 0) |
600 |
qerror("%s: Warning executable can't be mapped at the right address (offset: 0x%x)\n", filename, slide);
|
601 |
|
602 |
if(strcmp(((struct segment_command*)(lc))->segname, "__TEXT") == 0) |
603 |
{ |
604 |
/* Text section */
|
605 |
if(mach_hdr.filetype == MH_EXECUTE)
|
606 |
{ |
607 |
/* return the mach_header */
|
608 |
*mh = (void*)(((struct segment_command*)(lc))->vmaddr + slide); |
609 |
} |
610 |
else
|
611 |
{ |
612 |
/* it is dyld save the section for gdb, we will be interested in dyld symbol
|
613 |
while debuging */
|
614 |
macho_text_sect = (void*)(((struct segment_command*)(lc))->vmaddr + slide); |
615 |
macho_offset = slide; |
616 |
} |
617 |
} |
618 |
break;
|
619 |
case LC_LOAD_DYLINKER:
|
620 |
dyld_entry_point = load_dylinker( &mach_hdr, (struct dylinker_command*)lc, fd, mach_hdr_pos, need_bswap );
|
621 |
break;
|
622 |
case LC_LOAD_DYLIB:
|
623 |
/* dyld will do that for us */
|
624 |
break;
|
625 |
case LC_THREAD:
|
626 |
case LC_UNIXTHREAD:
|
627 |
{ |
628 |
struct target_pt_regs * _regs;
|
629 |
if(mach_hdr.filetype == MH_DYLINKER)
|
630 |
_regs = regs; |
631 |
else
|
632 |
_regs = 0;
|
633 |
entry_point = load_thread( &mach_hdr, (struct target_thread_command*)lc, _regs, fd, mach_hdr_pos, need_bswap );
|
634 |
} |
635 |
break;
|
636 |
case LC_SYMTAB:
|
637 |
/* Save the symtab and strtab */
|
638 |
symtabcmd = (struct symtab_command *)lc;
|
639 |
break;
|
640 |
case LC_ID_DYLINKER:
|
641 |
case LC_ID_DYLIB:
|
642 |
case LC_UUID:
|
643 |
case LC_DYSYMTAB:
|
644 |
case LC_TWOLEVEL_HINTS:
|
645 |
case LC_PREBIND_CKSUM:
|
646 |
case LC_SUB_LIBRARY:
|
647 |
break;
|
648 |
default: fprintf(stderr, "warning: unkown command 0x%x in '%s'\n", lc->cmd, filename); |
649 |
} |
650 |
lc = (struct load_command*)((int)(lc)+(lc->cmdsize)); |
651 |
} |
652 |
|
653 |
if(symtabcmd)
|
654 |
{ |
655 |
if(need_bswap)
|
656 |
bswap_symtabcmd(symtabcmd); |
657 |
|
658 |
symtab_std = load_data(fd, symtabcmd->symoff+mach_hdr_pos, symtabcmd->nsyms * sizeof(struct nlist)); |
659 |
strtab = load_data(fd, symtabcmd->stroff+mach_hdr_pos, symtabcmd->strsize); |
660 |
|
661 |
symtab = malloc(sizeof(struct nlist_extended) * symtabcmd->nsyms); |
662 |
|
663 |
if(need_bswap)
|
664 |
{ |
665 |
for(i = 0, syment = symtab_std; i < symtabcmd->nsyms; i++, syment++) |
666 |
bswap_sym(syment); |
667 |
} |
668 |
|
669 |
for(i = 0, sym = symtab, syment = symtab_std; i < symtabcmd->nsyms; i++, sym++, syment++) |
670 |
{ |
671 |
struct nlist *sym_follow, *sym_next = 0; |
672 |
unsigned int j; |
673 |
memset(sym, 0, sizeof(*sym)); |
674 |
|
675 |
sym->n_type = syment->n_type; |
676 |
if ( syment->n_type & N_STAB ) /* Debug symbols are skipped */ |
677 |
continue;
|
678 |
|
679 |
memcpy(sym, syment, sizeof(*syment));
|
680 |
|
681 |
/* Find the following symbol in order to get the current symbol size */
|
682 |
for(j = 0, sym_follow = symtab_std; j < symtabcmd->nsyms; j++, sym_follow++) { |
683 |
if ( sym_follow->n_type & N_STAB || !(sym_follow->n_value > sym->st_value))
|
684 |
continue;
|
685 |
if(!sym_next) {
|
686 |
sym_next = sym_follow; |
687 |
continue;
|
688 |
} |
689 |
if(!(sym_next->n_value > sym_follow->n_value))
|
690 |
continue;
|
691 |
sym_next = sym_follow; |
692 |
} |
693 |
if(sym_next)
|
694 |
sym->st_size = sym_next->n_value - sym->st_value; |
695 |
else
|
696 |
sym->st_size = 10; /* XXX: text_sec_hdr->size + text_sec_hdr->offset - sym->st_value; */ |
697 |
|
698 |
sym->st_value += slide; |
699 |
} |
700 |
|
701 |
free((void*)symtab_std);
|
702 |
|
703 |
{ |
704 |
DPRINTF("saving symtab of %s (%d symbol(s))\n", filename, symtabcmd->nsyms);
|
705 |
struct syminfo *s;
|
706 |
s = malloc(sizeof(*s));
|
707 |
s->disas_symtab = symtab; |
708 |
s->disas_strtab = strtab; |
709 |
s->disas_num_syms = symtabcmd->nsyms; |
710 |
s->next = syminfos; |
711 |
syminfos = s; |
712 |
} |
713 |
} |
714 |
close(fd); |
715 |
if(mach_hdr.filetype == MH_EXECUTE && dyld_entry_point)
|
716 |
return dyld_entry_point;
|
717 |
else
|
718 |
return entry_point+slide;
|
719 |
} |
720 |
|
721 |
extern unsigned long stack_size; |
722 |
|
723 |
unsigned long setup_arg_pages(void * mh, char ** argv, char ** env) |
724 |
{ |
725 |
unsigned long stack_base, error, size; |
726 |
int i;
|
727 |
int * stack;
|
728 |
int argc, envc;
|
729 |
|
730 |
/* Create enough stack to hold everything. If we don't use
|
731 |
* it for args, we'll use it for something else...
|
732 |
*/
|
733 |
size = stack_size; |
734 |
|
735 |
error = target_mmap(0,
|
736 |
size + qemu_host_page_size, |
737 |
PROT_READ | PROT_WRITE, |
738 |
MAP_PRIVATE | MAP_ANONYMOUS, |
739 |
-1, 0); |
740 |
if (error == -1) |
741 |
qerror("stk mmap");
|
742 |
|
743 |
/* we reserve one extra page at the top of the stack as guard */
|
744 |
target_mprotect(error + size, qemu_host_page_size, PROT_NONE); |
745 |
|
746 |
stack_base = error + size; |
747 |
stack = (void*)stack_base;
|
748 |
/*
|
749 |
* | STRING AREA |
|
750 |
* +-------------+
|
751 |
* | 0 |
|
752 |
* +-------------+
|
753 |
* | apple[n] |
|
754 |
* +-------------+
|
755 |
* :
|
756 |
* +-------------+
|
757 |
* | apple[0] |
|
758 |
* +-------------+
|
759 |
* | 0 |
|
760 |
* +-------------+
|
761 |
* | env[n] |
|
762 |
* +-------------+
|
763 |
* :
|
764 |
* :
|
765 |
* +-------------+
|
766 |
* | env[0] |
|
767 |
* +-------------+
|
768 |
* | 0 |
|
769 |
* +-------------+
|
770 |
* | arg[argc-1] |
|
771 |
* +-------------+
|
772 |
* :
|
773 |
* :
|
774 |
* +-------------+
|
775 |
* | arg[0] |
|
776 |
* +-------------+
|
777 |
* | argc |
|
778 |
* +-------------+
|
779 |
* sp-> | mh | address of where the a.out's file offset 0 is in memory
|
780 |
* +-------------+
|
781 |
*/
|
782 |
/* Construct the stack Stack grows down */
|
783 |
stack--; |
784 |
|
785 |
/* XXX: string should go up there */
|
786 |
|
787 |
*stack = 0;
|
788 |
stack--; |
789 |
|
790 |
/* Push the absolute path of our executable */
|
791 |
DPRINTF("pushing apple %s (0x%x)\n", (char*)argv[0], (int)argv[0]); |
792 |
stl(stack, (int) argv[0]); |
793 |
|
794 |
stack--; |
795 |
|
796 |
stl(stack, 0);
|
797 |
stack--; |
798 |
|
799 |
/* Get envc */
|
800 |
for(envc = 0; env[envc]; envc++); |
801 |
|
802 |
for(i = envc-1; i >= 0; i--) |
803 |
{ |
804 |
DPRINTF("pushing env %s (0x%x)\n", (char*)env[i], (int)env[i]); |
805 |
stl(stack, (int)env[i]);
|
806 |
stack--; |
807 |
|
808 |
/* XXX: remove that when string will be on top of the stack */
|
809 |
page_set_flags((int)env[i], (int)(env[i]+strlen(env[i])), PROT_READ | PAGE_VALID); |
810 |
} |
811 |
|
812 |
/* Add on the stack the interp_prefix choosen if so */
|
813 |
if(interp_prefix[0]) |
814 |
{ |
815 |
char *dyld_root;
|
816 |
asprintf(&dyld_root, "DYLD_ROOT_PATH=%s", interp_prefix);
|
817 |
page_set_flags((int)dyld_root, (int)(dyld_root+strlen(interp_prefix)+1), PROT_READ | PAGE_VALID); |
818 |
|
819 |
stl(stack, (int)dyld_root);
|
820 |
stack--; |
821 |
} |
822 |
|
823 |
#ifdef DONT_USE_DYLD_SHARED_MAP
|
824 |
{ |
825 |
char *shared_map_mode;
|
826 |
asprintf(&shared_map_mode, "DYLD_SHARED_REGION=avoid");
|
827 |
page_set_flags((int)shared_map_mode, (int)(shared_map_mode+strlen(shared_map_mode)+1), PROT_READ | PAGE_VALID); |
828 |
|
829 |
stl(stack, (int)shared_map_mode);
|
830 |
stack--; |
831 |
} |
832 |
#endif
|
833 |
|
834 |
#ifdef ACTIVATE_DYLD_TRACE
|
835 |
char * extra_env_static[] = {"DYLD_DEBUG_TRACE=yes", |
836 |
"DYLD_PREBIND_DEBUG=3", "DYLD_UNKNOW_TRACE=yes", |
837 |
"DYLD_PRINT_INITIALIZERS=yes",
|
838 |
"DYLD_PRINT_SEGMENTS=yes", "DYLD_PRINT_REBASINGS=yes", "DYLD_PRINT_BINDINGS=yes", "DYLD_PRINT_INITIALIZERS=yes", "DYLD_PRINT_WARNINGS=yes" }; |
839 |
|
840 |
char ** extra_env = malloc(sizeof(extra_env_static)); |
841 |
bcopy(extra_env_static, extra_env, sizeof(extra_env_static));
|
842 |
page_set_flags((int)extra_env, (int)((void*)extra_env+sizeof(extra_env_static)), PROT_READ | PAGE_VALID); |
843 |
|
844 |
for(i = 0; i<9; i++) |
845 |
{ |
846 |
DPRINTF("pushing (extra) env %s (0x%x)\n", (char*)extra_env[i], (int)extra_env[i]); |
847 |
stl(stack, (int) extra_env[i]);
|
848 |
stack--; |
849 |
} |
850 |
#endif
|
851 |
|
852 |
stl(stack, 0);
|
853 |
stack--; |
854 |
|
855 |
/* Get argc */
|
856 |
for(argc = 0; argv[argc]; argc++); |
857 |
|
858 |
for(i = argc-1; i >= 0; i--) |
859 |
{ |
860 |
DPRINTF("pushing arg %s (0x%x)\n", (char*)argv[i], (int)argv[i]); |
861 |
stl(stack, (int) argv[i]);
|
862 |
stack--; |
863 |
|
864 |
/* XXX: remove that when string will be on top of the stack */
|
865 |
page_set_flags((int)argv[i], (int)(argv[i]+strlen(argv[i])), PROT_READ | PAGE_VALID); |
866 |
} |
867 |
|
868 |
DPRINTF("pushing argc %d \n", argc);
|
869 |
stl(stack, argc); |
870 |
stack--; |
871 |
|
872 |
DPRINTF("pushing mh 0x%x \n", (int)mh); |
873 |
stl(stack, (int) mh);
|
874 |
|
875 |
/* Stack points on the mh */
|
876 |
return (unsigned long)stack; |
877 |
} |
878 |
|
879 |
int mach_exec(const char * filename, char ** argv, char ** envp, |
880 |
struct target_pt_regs * regs)
|
881 |
{ |
882 |
int entrypoint, stack;
|
883 |
void * mh; /* the Mach Header that will be used by dyld */ |
884 |
|
885 |
DPRINTF("mach_exec at 0x%x\n", (int)mach_exec); |
886 |
|
887 |
entrypoint = load_object(filename, regs, &mh); |
888 |
stack = setup_arg_pages(mh, argv, envp); |
889 |
#if defined(TARGET_I386)
|
890 |
regs->eip = entrypoint; |
891 |
regs->esp = stack; |
892 |
#elif defined(TARGET_PPC)
|
893 |
regs->nip = entrypoint; |
894 |
regs->gpr[1] = stack;
|
895 |
#endif
|
896 |
DPRINTF("mach_exec returns eip set to 0x%x esp 0x%x mh 0x%x\n", entrypoint, stack, (int)mh); |
897 |
|
898 |
if(!entrypoint)
|
899 |
qerror("%s: no entry point!\n", filename);
|
900 |
|
901 |
return 0; |
902 |
} |