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(value && 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(%llx,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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