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tag: 20121227
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/*
* 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, see <http://www.gnu.org/licenses/>.
*/
#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 { qemu_log(__VA_ARGS__); printf(__VA_ARGS__); } while(0)
#else
# define DPRINTF(...) do { qemu_log(__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(_ARCH_PPC) ^ 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 < ARRAY_SIZE(commpage_entries); 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(%" PRIx64 ",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 < ARRAY_SIZE(commpage_entries); 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);
}
}
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