diff options
Diffstat (limited to 'darwin-user/commpage.c')
| -rw-r--r-- | darwin-user/commpage.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/darwin-user/commpage.c b/darwin-user/commpage.c new file mode 100644 index 0000000000..12ee1da029 --- /dev/null +++ b/darwin-user/commpage.c @@ -0,0 +1,358 @@ + /* + * 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, 0x2c0, do_cgettimeofday, CALL_INDIRECT), + COMMPAGE_ENTRY(sys_dcache_flush, 0, 0x2c0, unimpl_commpage, CALL_INDIRECT), + COMMPAGE_ENTRY(sys_icache_invalidate, 0, 0x2c0, unimpl_commpage, CALL_INDIRECT), + COMMPAGE_ENTRY(pthread_self, 0, 0x2c0, 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) +{ + gemu_log("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); + } +} |