70afb8ff90
cppcheck reports this error: commpage.c:223: error: Possible null pointer dereference: value - otherwise it is redundant to check if value is null at line 214 The null pointer check in line 214 is indeed not needed. If value were null, the code would crash in line 223. See do_compare_and_swap64 were for a reference. Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
358 lines
13 KiB
C
358 lines
13 KiB
C
/*
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* Commpage syscalls
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*
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* Copyright (c) 2006 Pierre d'Herbemont
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <mach/message.h>
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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#include <sys/time.h>
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#include <sys/mman.h>
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#include <libkern/OSAtomic.h>
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#include "qemu.h"
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//#define DEBUG_COMMPAGE
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#ifdef DEBUG_COMMPAGE
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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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/********************************************************************
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* Commpage definitions
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*/
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#ifdef TARGET_I386
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/* Reserve space for the commpage see xnu/osfmk/i386/cpu_capabilities.h */
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# define COMMPAGE_START (-16 * 4096) /* base address is -20 * 4096 */
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# define COMMPAGE_SIZE (0x1240) /* _COMM_PAGE_AREA_LENGTH is 19 * 4096 */
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#elif defined(TARGET_PPC)
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/* Reserve space for the commpage see xnu/osfmk/ppc/cpu_capabilities.h */
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# define COMMPAGE_START (-8*4096)
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# define COMMPAGE_SIZE (2*4096) /* its _COMM_PAGE_AREA_USED but _COMM_PAGE_AREA_LENGTH is 7*4096 */
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#endif
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void do_compare_and_swap32(void *cpu_env, int num);
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void do_compare_and_swap64(void *cpu_env, int num);
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void do_add_atomic_word32(void *cpu_env, int num);
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void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1);
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void do_nanotime(void *cpu_env, int num);
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void unimpl_commpage(void *cpu_env, int num);
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typedef void (*commpage_8args_function_t)(uint32_t arg1, uint32_t arg2, uint32_t arg3,
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uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
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uint32_t arg8);
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typedef void (*commpage_indirect_function_t)(void *cpu_env, int num, uint32_t arg1,
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uint32_t arg2, uint32_t arg3, uint32_t arg4, uint32_t arg5,
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uint32_t arg6, uint32_t arg7, uint32_t arg8);
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#define HAS_PTR 0x10
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#define NO_PTR 0x20
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#define CALL_DIRECT 0x1
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#define CALL_INDIRECT 0x2
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#define COMMPAGE_ENTRY(name, nargs, offset, func, options) \
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{ #name, offset, nargs, options, (commpage_8args_function_t)func }
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struct commpage_entry {
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char * name;
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int offset;
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int nargs;
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char options;
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commpage_8args_function_t function;
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};
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static inline int commpage_code_num(struct commpage_entry *entry)
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{
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if((entry->options & HAS_PTR))
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return entry->offset + 4;
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else
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return entry->offset;
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}
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static inline int commpage_is_indirect(struct commpage_entry *entry)
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{
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return !(entry->options & CALL_DIRECT);
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}
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/********************************************************************
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* Commpage entry
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*/
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static struct commpage_entry commpage_entries[] =
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{
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COMMPAGE_ENTRY(compare_and_swap32, 0, 0x080, do_compare_and_swap32, CALL_INDIRECT | HAS_PTR),
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COMMPAGE_ENTRY(compare_and_swap64, 0, 0x0c0, do_compare_and_swap64, CALL_INDIRECT | HAS_PTR),
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COMMPAGE_ENTRY(enqueue, 0, 0x100, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(dequeue, 0, 0x140, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(memory_barrier, 0, 0x180, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(add_atomic_word32, 0, 0x1a0, do_add_atomic_word32, CALL_INDIRECT | HAS_PTR),
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COMMPAGE_ENTRY(add_atomic_word64, 0, 0x1c0, unimpl_commpage, CALL_INDIRECT | HAS_PTR),
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COMMPAGE_ENTRY(mach_absolute_time, 0, 0x200, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(spinlock_try, 1, 0x220, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(spinlock_lock, 1, 0x260, OSSpinLockLock, CALL_DIRECT),
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COMMPAGE_ENTRY(spinlock_unlock, 1, 0x2a0, OSSpinLockUnlock, CALL_DIRECT),
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COMMPAGE_ENTRY(pthread_getspecific, 0, 0x2c0, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(gettimeofday, 1, 0x2e0, do_cgettimeofday, CALL_INDIRECT),
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COMMPAGE_ENTRY(sys_dcache_flush, 0, 0x4e0, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(sys_icache_invalidate, 0, 0x520, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(pthread_self, 0, 0x580, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(relinquish, 0, 0x5c0, unimpl_commpage, CALL_INDIRECT),
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#ifdef TARGET_I386
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COMMPAGE_ENTRY(bts, 0, 0x5e0, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(btc, 0, 0x5f0, unimpl_commpage, CALL_INDIRECT),
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#endif
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COMMPAGE_ENTRY(bzero, 2, 0x600, bzero, CALL_DIRECT),
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COMMPAGE_ENTRY(bcopy, 3, 0x780, bcopy, CALL_DIRECT),
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COMMPAGE_ENTRY(memcpy, 3, 0x7a0, memcpy, CALL_DIRECT),
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#ifdef TARGET_I386
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COMMPAGE_ENTRY(old_nanotime, 0, 0xf80, do_nanotime, CALL_INDIRECT),
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COMMPAGE_ENTRY(memset_pattern, 0, 0xf80, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(long_copy, 0, 0x1200, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(sysintegrity, 0, 0x1600, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(nanotime, 0, 0x1700, do_nanotime, CALL_INDIRECT),
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#elif TARGET_PPC
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COMMPAGE_ENTRY(compare_and_swap32b, 0, 0xf80, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(compare_and_swap64b, 0, 0xfc0, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(memset_pattern, 0, 0x1000, unimpl_commpage, CALL_INDIRECT),
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COMMPAGE_ENTRY(bigcopy, 0, 0x1140, unimpl_commpage, CALL_INDIRECT),
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#endif
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};
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/********************************************************************
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* Commpage backdoor
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*/
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static inline void print_commpage_entry(struct commpage_entry entry)
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{
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printf("@0x%x %s\n", entry.offset, entry.name);
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}
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static inline void install_commpage_backdoor_for_entry(struct commpage_entry entry)
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{
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#ifdef TARGET_I386
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char * commpage = (char*)(COMMPAGE_START+entry.offset);
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int c = 0;
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if(entry.options & HAS_PTR)
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{
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commpage[c++] = (COMMPAGE_START+entry.offset+4) & 0xff;
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commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 8) & 0xff;
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commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 16) & 0xff;
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commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 24) & 0xff;
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}
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commpage[c++] = 0xcd;
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commpage[c++] = 0x79; /* int 0x79 */
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commpage[c++] = 0xc3; /* ret */
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#else
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qerror("can't install the commpage on this arch\n");
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#endif
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}
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/********************************************************************
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* Commpage initialization
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*/
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void commpage_init(void)
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{
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#if (defined(__i386__) ^ defined(TARGET_I386)) || (defined(_ARCH_PPC) ^ defined(TARGET_PPC))
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int i;
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void * commpage = (void *)target_mmap( COMMPAGE_START, COMMPAGE_SIZE,
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PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_FIXED, -1, 0);
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if((int)commpage != COMMPAGE_START)
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qerror("can't allocate the commpage\n");
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bzero(commpage, COMMPAGE_SIZE);
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/* XXX: commpage data not handled */
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for(i = 0; i < ARRAY_SIZE(commpage_entries); i++)
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install_commpage_backdoor_for_entry(commpage_entries[i]);
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#else
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/* simply map our pages so they can be executed
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XXX: we don't really want to do that since in the ppc on ppc situation we may
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not able to run commpages host optimized instructions (like G5's on a G5),
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hence this is sometimes a broken fix. */
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page_set_flags(COMMPAGE_START, COMMPAGE_START+COMMPAGE_SIZE, PROT_EXEC | PROT_READ | PAGE_VALID);
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#endif
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}
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/********************************************************************
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* Commpage implementation
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*/
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void do_compare_and_swap32(void *cpu_env, int num)
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{
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#ifdef TARGET_I386
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uint32_t old = ((CPUX86State*)cpu_env)->regs[R_EAX];
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uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_ECX];
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DPRINTF("commpage: compare_and_swap32(%x,new,%p)\n", old, value);
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if(old == tswap32(*value))
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{
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uint32_t new = ((CPUX86State*)cpu_env)->regs[R_EDX];
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*value = tswap32(new);
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/* set zf flag */
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((CPUX86State*)cpu_env)->eflags |= 0x40;
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}
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else
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{
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((CPUX86State*)cpu_env)->regs[R_EAX] = tswap32(*value);
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/* unset zf flag */
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((CPUX86State*)cpu_env)->eflags &= ~0x40;
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}
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#else
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qerror("do_compare_and_swap32 unimplemented");
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#endif
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}
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void do_compare_and_swap64(void *cpu_env, int num)
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{
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#ifdef TARGET_I386
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/* OSAtomicCompareAndSwap64 is not available on non 64 bits ppc, here is a raw implementation */
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uint64_t old, new, swapped_val;
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uint64_t *value = (uint64_t*)((CPUX86State*)cpu_env)->regs[R_ESI];
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old = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_EDX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EAX];
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DPRINTF("commpage: compare_and_swap64(%" PRIx64 ",new,%p)\n", old, value);
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swapped_val = tswap64(*value);
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if(old == swapped_val)
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{
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new = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_ECX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EBX];
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*value = tswap64(new);
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/* set zf flag */
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((CPUX86State*)cpu_env)->eflags |= 0x40;
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}
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else
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{
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((CPUX86State*)cpu_env)->regs[R_EAX] = (uint32_t)(swapped_val);
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((CPUX86State*)cpu_env)->regs[R_EDX] = (uint32_t)(swapped_val >> 32);
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/* unset zf flag */
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((CPUX86State*)cpu_env)->eflags &= ~0x40;
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}
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#else
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qerror("do_compare_and_swap64 unimplemented");
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#endif
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}
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void do_add_atomic_word32(void *cpu_env, int num)
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{
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#ifdef TARGET_I386
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uint32_t amt = ((CPUX86State*)cpu_env)->regs[R_EAX];
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uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_EDX];
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uint32_t swapped_value = tswap32(*value);
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DPRINTF("commpage: add_atomic_word32(%x,%p)\n", amt, value);
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/* old value in EAX */
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((CPUX86State*)cpu_env)->regs[R_EAX] = swapped_value;
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*value = tswap32(swapped_value + amt);
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#else
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qerror("do_add_atomic_word32 unimplemented");
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#endif
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}
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void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1)
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{
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#ifdef TARGET_I386
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extern int __commpage_gettimeofday(struct timeval *);
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DPRINTF("commpage: gettimeofday(0x%x)\n", arg1);
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struct timeval *time = (struct timeval *)arg1;
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int ret = __commpage_gettimeofday(time);
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tswap32s((uint32_t*)&time->tv_sec);
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tswap32s((uint32_t*)&time->tv_usec);
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((CPUX86State*)cpu_env)->regs[R_EAX] = ret; /* Success */
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#else
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qerror("do_gettimeofday unimplemented");
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#endif
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}
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void do_nanotime(void *cpu_env, int num)
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{
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#ifdef TARGET_I386
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uint64_t t = mach_absolute_time();
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((CPUX86State*)cpu_env)->regs[R_EAX] = (int)(t & 0xffffffff);
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((CPUX86State*)cpu_env)->regs[R_EDX] = (int)((t >> 32) & 0xffffffff);
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#else
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qerror("do_nanotime unimplemented");
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#endif
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}
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void unimpl_commpage(void *cpu_env, int num)
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{
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qerror("qemu: commpage function 0x%x not implemented\n", num);
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}
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/********************************************************************
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* do_commpage - called by the main cpu loop
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*/
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void
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do_commpage(void *cpu_env, int num, uint32_t arg1, uint32_t arg2, uint32_t arg3,
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uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
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uint32_t arg8)
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{
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int i, found = 0;
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arg1 = tswap32(arg1);
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arg2 = tswap32(arg2);
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arg3 = tswap32(arg3);
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arg4 = tswap32(arg4);
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arg5 = tswap32(arg5);
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arg6 = tswap32(arg6);
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arg7 = tswap32(arg7);
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arg8 = tswap32(arg8);
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num = num-COMMPAGE_START-2;
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for(i = 0; i < ARRAY_SIZE(commpage_entries); i++) {
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if( num == commpage_code_num(&commpage_entries[i]) )
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{
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DPRINTF("commpage: %s %s\n", commpage_entries[i].name, commpage_is_indirect(&commpage_entries[i]) ? "[indirect]" : "[direct]");
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found = 1;
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if(commpage_is_indirect(&commpage_entries[i]))
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{
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commpage_indirect_function_t function = (commpage_indirect_function_t)commpage_entries[i].function;
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function(cpu_env, num, arg1, arg2, arg3,
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arg4, arg5, arg6, arg7, arg8);
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}
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else
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{
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commpage_entries[i].function(arg1, arg2, arg3,
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arg4, arg5, arg6, arg7, arg8);
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}
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break;
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}
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}
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if(!found)
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{
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gemu_log("qemu: commpage function 0x%x not defined\n", num);
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gdb_handlesig (cpu_env, SIGTRAP);
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exit(-1);
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}
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}
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