| /* |
| * Commpage syscalls |
| * |
| * Copyright (c) 2006 Pierre d'Herbemont |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| |
| #include <mach/message.h> |
| #include <mach/mach.h> |
| #include <mach/mach_time.h> |
| #include <sys/time.h> |
| #include <sys/mman.h> |
| #include <libkern/OSAtomic.h> |
| |
| #include "qemu.h" |
| |
| //#define DEBUG_COMMPAGE |
| |
| #ifdef DEBUG_COMMPAGE |
| # define DPRINTF(...) do { if(loglevel) fprintf(logfile, __VA_ARGS__); printf(__VA_ARGS__); } while(0) |
| #else |
| # define DPRINTF(...) do { if(loglevel) fprintf(logfile, __VA_ARGS__); } while(0) |
| #endif |
| |
| /******************************************************************** |
| * Commpage definitions |
| */ |
| #ifdef TARGET_I386 |
| /* Reserve space for the commpage see xnu/osfmk/i386/cpu_capabilities.h */ |
| # define COMMPAGE_START (-16 * 4096) /* base address is -20 * 4096 */ |
| # define COMMPAGE_SIZE (0x1240) /* _COMM_PAGE_AREA_LENGTH is 19 * 4096 */ |
| #elif defined(TARGET_PPC) |
| /* Reserve space for the commpage see xnu/osfmk/ppc/cpu_capabilities.h */ |
| # define COMMPAGE_START (-8*4096) |
| # define COMMPAGE_SIZE (2*4096) /* its _COMM_PAGE_AREA_USED but _COMM_PAGE_AREA_LENGTH is 7*4096 */ |
| #endif |
| |
| void do_compare_and_swap32(void *cpu_env, int num); |
| void do_compare_and_swap64(void *cpu_env, int num); |
| void do_add_atomic_word32(void *cpu_env, int num); |
| void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1); |
| void do_nanotime(void *cpu_env, int num); |
| |
| void unimpl_commpage(void *cpu_env, int num); |
| |
| typedef void (*commpage_8args_function_t)(uint32_t arg1, uint32_t arg2, uint32_t arg3, |
| uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7, |
| uint32_t arg8); |
| typedef void (*commpage_indirect_function_t)(void *cpu_env, int num, uint32_t arg1, |
| uint32_t arg2, uint32_t arg3, uint32_t arg4, uint32_t arg5, |
| uint32_t arg6, uint32_t arg7, uint32_t arg8); |
| |
| #define HAS_PTR 0x10 |
| #define NO_PTR 0x20 |
| #define CALL_DIRECT 0x1 |
| #define CALL_INDIRECT 0x2 |
| |
| #define COMMPAGE_ENTRY(name, nargs, offset, func, options) \ |
| { #name, offset, nargs, options, (commpage_8args_function_t)func } |
| |
| struct commpage_entry { |
| char * name; |
| int offset; |
| int nargs; |
| char options; |
| commpage_8args_function_t function; |
| }; |
| |
| static inline int commpage_code_num(struct commpage_entry *entry) |
| { |
| if((entry->options & HAS_PTR)) |
| return entry->offset + 4; |
| else |
| return entry->offset; |
| } |
| |
| static inline int commpage_is_indirect(struct commpage_entry *entry) |
| { |
| return !(entry->options & CALL_DIRECT); |
| } |
| |
| /******************************************************************** |
| * Commpage entry |
| */ |
| static struct commpage_entry commpage_entries[] = |
| { |
| COMMPAGE_ENTRY(compare_and_swap32, 0, 0x080, do_compare_and_swap32, CALL_INDIRECT | HAS_PTR), |
| COMMPAGE_ENTRY(compare_and_swap64, 0, 0x0c0, do_compare_and_swap64, CALL_INDIRECT | HAS_PTR), |
| COMMPAGE_ENTRY(enqueue, 0, 0x100, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(dequeue, 0, 0x140, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(memory_barrier, 0, 0x180, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(add_atomic_word32, 0, 0x1a0, do_add_atomic_word32, CALL_INDIRECT | HAS_PTR), |
| COMMPAGE_ENTRY(add_atomic_word64, 0, 0x1c0, unimpl_commpage, CALL_INDIRECT | HAS_PTR), |
| |
| COMMPAGE_ENTRY(mach_absolute_time, 0, 0x200, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(spinlock_try, 1, 0x220, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(spinlock_lock, 1, 0x260, OSSpinLockLock, CALL_DIRECT), |
| COMMPAGE_ENTRY(spinlock_unlock, 1, 0x2a0, OSSpinLockUnlock, CALL_DIRECT), |
| COMMPAGE_ENTRY(pthread_getspecific, 0, 0x2c0, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(gettimeofday, 1, 0x2e0, do_cgettimeofday, CALL_INDIRECT), |
| COMMPAGE_ENTRY(sys_dcache_flush, 0, 0x4e0, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(sys_icache_invalidate, 0, 0x520, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(pthread_self, 0, 0x580, unimpl_commpage, CALL_INDIRECT), |
| |
| COMMPAGE_ENTRY(relinquish, 0, 0x5c0, unimpl_commpage, CALL_INDIRECT), |
| |
| #ifdef TARGET_I386 |
| COMMPAGE_ENTRY(bts, 0, 0x5e0, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(btc, 0, 0x5f0, unimpl_commpage, CALL_INDIRECT), |
| #endif |
| |
| COMMPAGE_ENTRY(bzero, 2, 0x600, bzero, CALL_DIRECT), |
| COMMPAGE_ENTRY(bcopy, 3, 0x780, bcopy, CALL_DIRECT), |
| COMMPAGE_ENTRY(memcpy, 3, 0x7a0, memcpy, CALL_DIRECT), |
| |
| #ifdef TARGET_I386 |
| COMMPAGE_ENTRY(old_nanotime, 0, 0xf80, do_nanotime, CALL_INDIRECT), |
| COMMPAGE_ENTRY(memset_pattern, 0, 0xf80, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(long_copy, 0, 0x1200, unimpl_commpage, CALL_INDIRECT), |
| |
| COMMPAGE_ENTRY(sysintegrity, 0, 0x1600, unimpl_commpage, CALL_INDIRECT), |
| |
| COMMPAGE_ENTRY(nanotime, 0, 0x1700, do_nanotime, CALL_INDIRECT), |
| #elif TARGET_PPC |
| COMMPAGE_ENTRY(compare_and_swap32b, 0, 0xf80, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(compare_and_swap64b, 0, 0xfc0, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(memset_pattern, 0, 0x1000, unimpl_commpage, CALL_INDIRECT), |
| COMMPAGE_ENTRY(bigcopy, 0, 0x1140, unimpl_commpage, CALL_INDIRECT), |
| #endif |
| }; |
| |
| |
| /******************************************************************** |
| * Commpage backdoor |
| */ |
| static inline void print_commpage_entry(struct commpage_entry entry) |
| { |
| printf("@0x%x %s\n", entry.offset, entry.name); |
| } |
| |
| static inline void install_commpage_backdoor_for_entry(struct commpage_entry entry) |
| { |
| #ifdef TARGET_I386 |
| char * commpage = (char*)(COMMPAGE_START+entry.offset); |
| int c = 0; |
| if(entry.options & HAS_PTR) |
| { |
| commpage[c++] = (COMMPAGE_START+entry.offset+4) & 0xff; |
| commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 8) & 0xff; |
| commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 16) & 0xff; |
| commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 24) & 0xff; |
| } |
| commpage[c++] = 0xcd; |
| commpage[c++] = 0x79; /* int 0x79 */ |
| commpage[c++] = 0xc3; /* ret */ |
| #else |
| qerror("can't install the commpage on this arch\n"); |
| #endif |
| } |
| |
| /******************************************************************** |
| * Commpage initialization |
| */ |
| void commpage_init(void) |
| { |
| #if (defined(__i386__) ^ defined(TARGET_I386)) || (defined(__powerpc__) ^ defined(TARGET_PPC)) |
| int i; |
| void * commpage = (void *)target_mmap( COMMPAGE_START, COMMPAGE_SIZE, |
| PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_FIXED, -1, 0); |
| if((int)commpage != COMMPAGE_START) |
| qerror("can't allocate the commpage\n"); |
| |
| bzero(commpage, COMMPAGE_SIZE); |
| |
| /* XXX: commpage data not handled */ |
| |
| for(i = 0; i < sizeof(commpage_entries)/sizeof(commpage_entries[0]); i++) |
| install_commpage_backdoor_for_entry(commpage_entries[i]); |
| #else |
| /* simply map our pages so they can be executed |
| XXX: we don't really want to do that since in the ppc on ppc situation we may |
| not able to run commpages host optimized instructions (like G5's on a G5), |
| hence this is sometimes a broken fix. */ |
| page_set_flags(COMMPAGE_START, COMMPAGE_START+COMMPAGE_SIZE, PROT_EXEC | PROT_READ | PAGE_VALID); |
| #endif |
| } |
| |
| /******************************************************************** |
| * Commpage implementation |
| */ |
| void do_compare_and_swap32(void *cpu_env, int num) |
| { |
| #ifdef TARGET_I386 |
| uint32_t old = ((CPUX86State*)cpu_env)->regs[R_EAX]; |
| uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_ECX]; |
| DPRINTF("commpage: compare_and_swap32(%x,new,%p)\n", old, value); |
| |
| if(value && old == tswap32(*value)) |
| { |
| uint32_t new = ((CPUX86State*)cpu_env)->regs[R_EDX]; |
| *value = tswap32(new); |
| /* set zf flag */ |
| ((CPUX86State*)cpu_env)->eflags |= 0x40; |
| } |
| else |
| { |
| ((CPUX86State*)cpu_env)->regs[R_EAX] = tswap32(*value); |
| /* unset zf flag */ |
| ((CPUX86State*)cpu_env)->eflags &= ~0x40; |
| } |
| #else |
| qerror("do_compare_and_swap32 unimplemented"); |
| #endif |
| } |
| |
| void do_compare_and_swap64(void *cpu_env, int num) |
| { |
| #ifdef TARGET_I386 |
| /* OSAtomicCompareAndSwap64 is not available on non 64 bits ppc, here is a raw implementation */ |
| uint64_t old, new, swapped_val; |
| uint64_t *value = (uint64_t*)((CPUX86State*)cpu_env)->regs[R_ESI]; |
| old = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_EDX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EAX]; |
| |
| DPRINTF("commpage: compare_and_swap64(%llx,new,%p)\n", old, value); |
| swapped_val = tswap64(*value); |
| |
| if(old == swapped_val) |
| { |
| new = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_ECX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EBX]; |
| *value = tswap64(new); |
| /* set zf flag */ |
| ((CPUX86State*)cpu_env)->eflags |= 0x40; |
| } |
| else |
| { |
| ((CPUX86State*)cpu_env)->regs[R_EAX] = (uint32_t)(swapped_val); |
| ((CPUX86State*)cpu_env)->regs[R_EDX] = (uint32_t)(swapped_val >> 32); |
| /* unset zf flag */ |
| ((CPUX86State*)cpu_env)->eflags &= ~0x40; |
| } |
| #else |
| qerror("do_compare_and_swap64 unimplemented"); |
| #endif |
| } |
| |
| void do_add_atomic_word32(void *cpu_env, int num) |
| { |
| #ifdef TARGET_I386 |
| uint32_t amt = ((CPUX86State*)cpu_env)->regs[R_EAX]; |
| uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_EDX]; |
| uint32_t swapped_value = tswap32(*value); |
| |
| DPRINTF("commpage: add_atomic_word32(%x,%p)\n", amt, value); |
| |
| /* old value in EAX */ |
| ((CPUX86State*)cpu_env)->regs[R_EAX] = swapped_value; |
| *value = tswap32(swapped_value + amt); |
| #else |
| qerror("do_add_atomic_word32 unimplemented"); |
| #endif |
| } |
| |
| void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1) |
| { |
| #ifdef TARGET_I386 |
| extern int __commpage_gettimeofday(struct timeval *); |
| DPRINTF("commpage: gettimeofday(0x%x)\n", arg1); |
| struct timeval *time = (struct timeval *)arg1; |
| int ret = __commpage_gettimeofday(time); |
| tswap32s((uint32_t*)&time->tv_sec); |
| tswap32s((uint32_t*)&time->tv_usec); |
| ((CPUX86State*)cpu_env)->regs[R_EAX] = ret; /* Success */ |
| #else |
| qerror("do_gettimeofday unimplemented"); |
| #endif |
| } |
| |
| void do_nanotime(void *cpu_env, int num) |
| { |
| #ifdef TARGET_I386 |
| uint64_t t = mach_absolute_time(); |
| ((CPUX86State*)cpu_env)->regs[R_EAX] = (int)(t & 0xffffffff); |
| ((CPUX86State*)cpu_env)->regs[R_EDX] = (int)((t >> 32) & 0xffffffff); |
| #else |
| qerror("do_nanotime unimplemented"); |
| #endif |
| } |
| |
| void unimpl_commpage(void *cpu_env, int num) |
| { |
| qerror("qemu: commpage function 0x%x not implemented\n", num); |
| } |
| |
| /******************************************************************** |
| * do_commpage - called by the main cpu loop |
| */ |
| void |
| do_commpage(void *cpu_env, int num, uint32_t arg1, uint32_t arg2, uint32_t arg3, |
| uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7, |
| uint32_t arg8) |
| { |
| int i, found = 0; |
| |
| arg1 = tswap32(arg1); |
| arg2 = tswap32(arg2); |
| arg3 = tswap32(arg3); |
| arg4 = tswap32(arg4); |
| arg5 = tswap32(arg5); |
| arg6 = tswap32(arg6); |
| arg7 = tswap32(arg7); |
| arg8 = tswap32(arg8); |
| |
| num = num-COMMPAGE_START-2; |
| |
| for(i = 0; i < sizeof(commpage_entries)/sizeof(commpage_entries[0]); i++) { |
| if( num == commpage_code_num(&commpage_entries[i]) ) |
| { |
| DPRINTF("commpage: %s %s\n", commpage_entries[i].name, commpage_is_indirect(&commpage_entries[i]) ? "[indirect]" : "[direct]"); |
| found = 1; |
| if(commpage_is_indirect(&commpage_entries[i])) |
| { |
| commpage_indirect_function_t function = (commpage_indirect_function_t)commpage_entries[i].function; |
| function(cpu_env, num, arg1, arg2, arg3, |
| arg4, arg5, arg6, arg7, arg8); |
| } |
| else |
| { |
| commpage_entries[i].function(arg1, arg2, arg3, |
| arg4, arg5, arg6, arg7, arg8); |
| } |
| break; |
| } |
| } |
| |
| if(!found) |
| { |
| gemu_log("qemu: commpage function 0x%x not defined\n", num); |
| gdb_handlesig (cpu_env, SIGTRAP); |
| exit(-1); |
| } |
| } |
