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xemu/cpu-exec.c
Aurelien Jarno 4cdc1cd137 target-mips: fix host CPU consumption when guest is idle 
When the CPU is in wait state, do not wake-up if an interrupt can't be
taken. This avoid host CPU running at 100% if a device (e.g. timer) has
an interrupt line left enabled.

Also factorize code to check if interrupts are enabled in
cpu_mips_hw_interrupts_pending().

Based on a patch from Edgar E. Iglesias <edgar.iglesias@gmail.com>

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2010-12-27 00:58:06 +01:00

1272 lines
44 KiB
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/*
* i386 emulator main execution loop
*
* Copyright (c) 2003-2005 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "exec.h"
#include "disas.h"
#include "tcg.h"
#include "kvm.h"
#include "qemu-barrier.h"
#if !defined(CONFIG_SOFTMMU)
#undef EAX
#undef ECX
#undef EDX
#undef EBX
#undef ESP
#undef EBP
#undef ESI
#undef EDI
#undef EIP
#include <signal.h>
#ifdef __linux__
#include <sys/ucontext.h>
#endif
#endif
#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
// Work around ugly bugs in glibc that mangle global register contents
#undef env
#define env cpu_single_env
#endif
int tb_invalidated_flag;
//#define CONFIG_DEBUG_EXEC
//#define DEBUG_SIGNAL
int qemu_cpu_has_work(CPUState *env)
{
return cpu_has_work(env);
}
void cpu_loop_exit(void)
{
env->current_tb = NULL;
longjmp(env->jmp_env, 1);
}
/* exit the current TB from a signal handler. The host registers are
restored in a state compatible with the CPU emulator
*/
void cpu_resume_from_signal(CPUState *env1, void *puc)
{
#if !defined(CONFIG_SOFTMMU)
#ifdef __linux__
struct ucontext *uc = puc;
#elif defined(__OpenBSD__)
struct sigcontext *uc = puc;
#endif
#endif
env = env1;
/* XXX: restore cpu registers saved in host registers */
#if !defined(CONFIG_SOFTMMU)
if (puc) {
/* XXX: use siglongjmp ? */
#ifdef __linux__
#ifdef __ia64
sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
#else
sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
#endif
#elif defined(__OpenBSD__)
sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
#endif
}
#endif
env->exception_index = -1;
longjmp(env->jmp_env, 1);
}
/* Execute the code without caching the generated code. An interpreter
could be used if available. */
static void cpu_exec_nocache(int max_cycles, TranslationBlock *orig_tb)
{
unsigned long next_tb;
TranslationBlock *tb;
/* Should never happen.
We only end up here when an existing TB is too long. */
if (max_cycles > CF_COUNT_MASK)
max_cycles = CF_COUNT_MASK;
tb = tb_gen_code(env, orig_tb->pc, orig_tb->cs_base, orig_tb->flags,
max_cycles);
env->current_tb = tb;
/* execute the generated code */
next_tb = tcg_qemu_tb_exec(tb->tc_ptr);
env->current_tb = NULL;
if ((next_tb & 3) == 2) {
/* Restore PC. This may happen if async event occurs before
the TB starts executing. */
cpu_pc_from_tb(env, tb);
}
tb_phys_invalidate(tb, -1);
tb_free(tb);
}
static TranslationBlock *tb_find_slow(target_ulong pc,
target_ulong cs_base,
uint64_t flags)
{
TranslationBlock *tb, **ptb1;
unsigned int h;
tb_page_addr_t phys_pc, phys_page1, phys_page2;
target_ulong virt_page2;
tb_invalidated_flag = 0;
/* find translated block using physical mappings */
phys_pc = get_page_addr_code(env, pc);
phys_page1 = phys_pc & TARGET_PAGE_MASK;
phys_page2 = -1;
h = tb_phys_hash_func(phys_pc);
ptb1 = &tb_phys_hash[h];
for(;;) {
tb = *ptb1;
if (!tb)
goto not_found;
if (tb->pc == pc &&
tb->page_addr[0] == phys_page1 &&
tb->cs_base == cs_base &&
tb->flags == flags) {
/* check next page if needed */
if (tb->page_addr[1] != -1) {
virt_page2 = (pc & TARGET_PAGE_MASK) +
TARGET_PAGE_SIZE;
phys_page2 = get_page_addr_code(env, virt_page2);
if (tb->page_addr[1] == phys_page2)
goto found;
} else {
goto found;
}
}
ptb1 = &tb->phys_hash_next;
}
not_found:
/* if no translated code available, then translate it now */
tb = tb_gen_code(env, pc, cs_base, flags, 0);
found:
/* Move the last found TB to the head of the list */
if (likely(*ptb1)) {
*ptb1 = tb->phys_hash_next;
tb->phys_hash_next = tb_phys_hash[h];
tb_phys_hash[h] = tb;
}
/* we add the TB in the virtual pc hash table */
env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)] = tb;
return tb;
}
static inline TranslationBlock *tb_find_fast(void)
{
TranslationBlock *tb;
target_ulong cs_base, pc;
int flags;
/* we record a subset of the CPU state. It will
always be the same before a given translated block
is executed. */
cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
tb = env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)];
if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base ||
tb->flags != flags)) {
tb = tb_find_slow(pc, cs_base, flags);
}
return tb;
}
static CPUDebugExcpHandler *debug_excp_handler;
CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler)
{
CPUDebugExcpHandler *old_handler = debug_excp_handler;
debug_excp_handler = handler;
return old_handler;
}
static void cpu_handle_debug_exception(CPUState *env)
{
CPUWatchpoint *wp;
if (!env->watchpoint_hit)
QTAILQ_FOREACH(wp, &env->watchpoints, entry)
wp->flags &= ~BP_WATCHPOINT_HIT;
if (debug_excp_handler)
debug_excp_handler(env);
}
/* main execution loop */
volatile sig_atomic_t exit_request;
int cpu_exec(CPUState *env1)
{
volatile host_reg_t saved_env_reg;
int ret, interrupt_request;
TranslationBlock *tb;
uint8_t *tc_ptr;
unsigned long next_tb;
if (cpu_halted(env1) == EXCP_HALTED)
return EXCP_HALTED;
cpu_single_env = env1;
/* the access to env below is actually saving the global register's
value, so that files not including target-xyz/exec.h are free to
use it. */
QEMU_BUILD_BUG_ON (sizeof (saved_env_reg) != sizeof (env));
saved_env_reg = (host_reg_t) env;
barrier();
env = env1;
if (unlikely(exit_request)) {
env->exit_request = 1;
}
#if defined(TARGET_I386)
if (!kvm_enabled()) {
/* put eflags in CPU temporary format */
CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
DF = 1 - (2 * ((env->eflags >> 10) & 1));
CC_OP = CC_OP_EFLAGS;
env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
}
#elif defined(TARGET_SPARC)
#elif defined(TARGET_M68K)
env->cc_op = CC_OP_FLAGS;
env->cc_dest = env->sr & 0xf;
env->cc_x = (env->sr >> 4) & 1;
#elif defined(TARGET_ALPHA)
#elif defined(TARGET_ARM)
#elif defined(TARGET_PPC)
#elif defined(TARGET_MICROBLAZE)
#elif defined(TARGET_MIPS)
#elif defined(TARGET_SH4)
#elif defined(TARGET_CRIS)
#elif defined(TARGET_S390X)
/* XXXXX */
#else
#error unsupported target CPU
#endif
env->exception_index = -1;
/* prepare setjmp context for exception handling */
for(;;) {
if (setjmp(env->jmp_env) == 0) {
#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
#undef env
env = cpu_single_env;
#define env cpu_single_env
#endif
/* if an exception is pending, we execute it here */
if (env->exception_index >= 0) {
if (env->exception_index >= EXCP_INTERRUPT) {
/* exit request from the cpu execution loop */
ret = env->exception_index;
if (ret == EXCP_DEBUG)
cpu_handle_debug_exception(env);
break;
} else {
#if defined(CONFIG_USER_ONLY)
/* if user mode only, we simulate a fake exception
which will be handled outside the cpu execution
loop */
#if defined(TARGET_I386)
do_interrupt_user(env->exception_index,
env->exception_is_int,
env->error_code,
env->exception_next_eip);
/* successfully delivered */
env->old_exception = -1;
#endif
ret = env->exception_index;
break;
#else
#if defined(TARGET_I386)
/* simulate a real cpu exception. On i386, it can
trigger new exceptions, but we do not handle
double or triple faults yet. */
do_interrupt(env->exception_index,
env->exception_is_int,
env->error_code,
env->exception_next_eip, 0);
/* successfully delivered */
env->old_exception = -1;
#elif defined(TARGET_PPC)
do_interrupt(env);
#elif defined(TARGET_MICROBLAZE)
do_interrupt(env);
#elif defined(TARGET_MIPS)
do_interrupt(env);
#elif defined(TARGET_SPARC)
do_interrupt(env);
#elif defined(TARGET_ARM)
do_interrupt(env);
#elif defined(TARGET_SH4)
do_interrupt(env);
#elif defined(TARGET_ALPHA)
do_interrupt(env);
#elif defined(TARGET_CRIS)
do_interrupt(env);
#elif defined(TARGET_M68K)
do_interrupt(0);
#endif
env->exception_index = -1;
#endif
}
}
if (kvm_enabled()) {
kvm_cpu_exec(env);
longjmp(env->jmp_env, 1);
}
next_tb = 0; /* force lookup of first TB */
for(;;) {
interrupt_request = env->interrupt_request;
if (unlikely(interrupt_request)) {
if (unlikely(env->singlestep_enabled & SSTEP_NOIRQ)) {
/* Mask out external interrupts for this step. */
interrupt_request &= ~(CPU_INTERRUPT_HARD |
CPU_INTERRUPT_FIQ |
CPU_INTERRUPT_SMI |
CPU_INTERRUPT_NMI);
}
if (interrupt_request & CPU_INTERRUPT_DEBUG) {
env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
env->exception_index = EXCP_DEBUG;
cpu_loop_exit();
}
#if defined(TARGET_ARM) || defined(TARGET_SPARC) || defined(TARGET_MIPS) || \
defined(TARGET_PPC) || defined(TARGET_ALPHA) || defined(TARGET_CRIS) || \
defined(TARGET_MICROBLAZE)
if (interrupt_request & CPU_INTERRUPT_HALT) {
env->interrupt_request &= ~CPU_INTERRUPT_HALT;
env->halted = 1;
env->exception_index = EXCP_HLT;
cpu_loop_exit();
}
#endif
#if defined(TARGET_I386)
if (interrupt_request & CPU_INTERRUPT_INIT) {
svm_check_intercept(SVM_EXIT_INIT);
do_cpu_init(env);
env->exception_index = EXCP_HALTED;
cpu_loop_exit();
} else if (interrupt_request & CPU_INTERRUPT_SIPI) {
do_cpu_sipi(env);
} else if (env->hflags2 & HF2_GIF_MASK) {
if ((interrupt_request & CPU_INTERRUPT_SMI) &&
!(env->hflags & HF_SMM_MASK)) {
svm_check_intercept(SVM_EXIT_SMI);
env->interrupt_request &= ~CPU_INTERRUPT_SMI;
do_smm_enter();
next_tb = 0;
} else if ((interrupt_request & CPU_INTERRUPT_NMI) &&
!(env->hflags2 & HF2_NMI_MASK)) {
env->interrupt_request &= ~CPU_INTERRUPT_NMI;
env->hflags2 |= HF2_NMI_MASK;
do_interrupt(EXCP02_NMI, 0, 0, 0, 1);
next_tb = 0;
} else if (interrupt_request & CPU_INTERRUPT_MCE) {
env->interrupt_request &= ~CPU_INTERRUPT_MCE;
do_interrupt(EXCP12_MCHK, 0, 0, 0, 0);
next_tb = 0;
} else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
(((env->hflags2 & HF2_VINTR_MASK) &&
(env->hflags2 & HF2_HIF_MASK)) ||
(!(env->hflags2 & HF2_VINTR_MASK) &&
(env->eflags & IF_MASK &&
!(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
int intno;
svm_check_intercept(SVM_EXIT_INTR);
env->interrupt_request &= ~(CPU_INTERRUPT_HARD | CPU_INTERRUPT_VIRQ);
intno = cpu_get_pic_interrupt(env);
qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
#undef env
env = cpu_single_env;
#define env cpu_single_env
#endif
do_interrupt(intno, 0, 0, 0, 1);
/* ensure that no TB jump will be modified as
the program flow was changed */
next_tb = 0;
#if !defined(CONFIG_USER_ONLY)
} else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
(env->eflags & IF_MASK) &&
!(env->hflags & HF_INHIBIT_IRQ_MASK)) {
int intno;
/* FIXME: this should respect TPR */
svm_check_intercept(SVM_EXIT_VINTR);
intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
do_interrupt(intno, 0, 0, 0, 1);
env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
next_tb = 0;
#endif
}
}
#elif defined(TARGET_PPC)
#if 0
if ((interrupt_request & CPU_INTERRUPT_RESET)) {
cpu_reset(env);
}
#endif
if (interrupt_request & CPU_INTERRUPT_HARD) {
ppc_hw_interrupt(env);
if (env->pending_interrupts == 0)
env->interrupt_request &= ~CPU_INTERRUPT_HARD;
next_tb = 0;
}
#elif defined(TARGET_MICROBLAZE)
if ((interrupt_request & CPU_INTERRUPT_HARD)
&& (env->sregs[SR_MSR] & MSR_IE)
&& !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP))
&& !(env->iflags & (D_FLAG | IMM_FLAG))) {
env->exception_index = EXCP_IRQ;
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_MIPS)
if ((interrupt_request & CPU_INTERRUPT_HARD) &&
cpu_mips_hw_interrupts_pending(env)) {
/* Raise it */
env->exception_index = EXCP_EXT_INTERRUPT;
env->error_code = 0;
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_SPARC)
if (interrupt_request & CPU_INTERRUPT_HARD) {
if (cpu_interrupts_enabled(env) &&
env->interrupt_index > 0) {
int pil = env->interrupt_index & 0xf;
int type = env->interrupt_index & 0xf0;
if (((type == TT_EXTINT) &&
cpu_pil_allowed(env, pil)) ||
type != TT_EXTINT) {
env->exception_index = env->interrupt_index;
do_interrupt(env);
next_tb = 0;
}
}
} else if (interrupt_request & CPU_INTERRUPT_TIMER) {
//do_interrupt(0, 0, 0, 0, 0);
env->interrupt_request &= ~CPU_INTERRUPT_TIMER;
}
#elif defined(TARGET_ARM)
if (interrupt_request & CPU_INTERRUPT_FIQ
&& !(env->uncached_cpsr & CPSR_F)) {
env->exception_index = EXCP_FIQ;
do_interrupt(env);
next_tb = 0;
}
/* ARMv7-M interrupt return works by loading a magic value
into the PC. On real hardware the load causes the
return to occur. The qemu implementation performs the
jump normally, then does the exception return when the
CPU tries to execute code at the magic address.
This will cause the magic PC value to be pushed to
the stack if an interrupt occured at the wrong time.
We avoid this by disabling interrupts when
pc contains a magic address. */
if (interrupt_request & CPU_INTERRUPT_HARD
&& ((IS_M(env) && env->regs[15] < 0xfffffff0)
|| !(env->uncached_cpsr & CPSR_I))) {
env->exception_index = EXCP_IRQ;
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_SH4)
if (interrupt_request & CPU_INTERRUPT_HARD) {
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_ALPHA)
if (interrupt_request & CPU_INTERRUPT_HARD) {
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_CRIS)
if (interrupt_request & CPU_INTERRUPT_HARD
&& (env->pregs[PR_CCS] & I_FLAG)
&& !env->locked_irq) {
env->exception_index = EXCP_IRQ;
do_interrupt(env);
next_tb = 0;
}
if (interrupt_request & CPU_INTERRUPT_NMI
&& (env->pregs[PR_CCS] & M_FLAG)) {
env->exception_index = EXCP_NMI;
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_M68K)
if (interrupt_request & CPU_INTERRUPT_HARD
&& ((env->sr & SR_I) >> SR_I_SHIFT)
< env->pending_level) {
/* Real hardware gets the interrupt vector via an
IACK cycle at this point. Current emulated
hardware doesn't rely on this, so we
provide/save the vector when the interrupt is
first signalled. */
env->exception_index = env->pending_vector;
do_interrupt(1);
next_tb = 0;
}
#endif
/* Don't use the cached interupt_request value,
do_interrupt may have updated the EXITTB flag. */
if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
/* ensure that no TB jump will be modified as
the program flow was changed */
next_tb = 0;
}
}
if (unlikely(env->exit_request)) {
env->exit_request = 0;
env->exception_index = EXCP_INTERRUPT;
cpu_loop_exit();
}
#if defined(DEBUG_DISAS) || defined(CONFIG_DEBUG_EXEC)
if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
/* restore flags in standard format */
#if defined(TARGET_I386)
env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
log_cpu_state(env, X86_DUMP_CCOP);
env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
#elif defined(TARGET_M68K)
cpu_m68k_flush_flags(env, env->cc_op);
env->cc_op = CC_OP_FLAGS;
env->sr = (env->sr & 0xffe0)
| env->cc_dest | (env->cc_x << 4);
log_cpu_state(env, 0);
#else
log_cpu_state(env, 0);
#endif
}
#endif /* DEBUG_DISAS || CONFIG_DEBUG_EXEC */
spin_lock(&tb_lock);
tb = tb_find_fast();
/* Note: we do it here to avoid a gcc bug on Mac OS X when
doing it in tb_find_slow */
if (tb_invalidated_flag) {
/* as some TB could have been invalidated because
of memory exceptions while generating the code, we
must recompute the hash index here */
next_tb = 0;
tb_invalidated_flag = 0;
}
#ifdef CONFIG_DEBUG_EXEC
qemu_log_mask(CPU_LOG_EXEC, "Trace 0x%08lx [" TARGET_FMT_lx "] %s\n",
(long)tb->tc_ptr, tb->pc,
lookup_symbol(tb->pc));
#endif
/* see if we can patch the calling TB. When the TB
spans two pages, we cannot safely do a direct
jump. */
if (next_tb != 0 && tb->page_addr[1] == -1) {
tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
}
spin_unlock(&tb_lock);
/* cpu_interrupt might be called while translating the
TB, but before it is linked into a potentially
infinite loop and becomes env->current_tb. Avoid
starting execution if there is a pending interrupt. */
env->current_tb = tb;
barrier();
if (likely(!env->exit_request)) {
tc_ptr = tb->tc_ptr;
/* execute the generated code */
#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
#undef env
env = cpu_single_env;
#define env cpu_single_env
#endif
next_tb = tcg_qemu_tb_exec(tc_ptr);
if ((next_tb & 3) == 2) {
/* Instruction counter expired. */
int insns_left;
tb = (TranslationBlock *)(long)(next_tb & ~3);
/* Restore PC. */
cpu_pc_from_tb(env, tb);
insns_left = env->icount_decr.u32;
if (env->icount_extra && insns_left >= 0) {
/* Refill decrementer and continue execution. */
env->icount_extra += insns_left;
if (env->icount_extra > 0xffff) {
insns_left = 0xffff;
} else {
insns_left = env->icount_extra;
}
env->icount_extra -= insns_left;
env->icount_decr.u16.low = insns_left;
} else {
if (insns_left > 0) {
/* Execute remaining instructions. */
cpu_exec_nocache(insns_left, tb);
}
env->exception_index = EXCP_INTERRUPT;
next_tb = 0;
cpu_loop_exit();
}
}
}
env->current_tb = NULL;
/* reset soft MMU for next block (it can currently
only be set by a memory fault) */
} /* for(;;) */
}
} /* for(;;) */
#if defined(TARGET_I386)
/* restore flags in standard format */
env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
#elif defined(TARGET_ARM)
/* XXX: Save/restore host fpu exception state?. */
#elif defined(TARGET_SPARC)
#elif defined(TARGET_PPC)
#elif defined(TARGET_M68K)
cpu_m68k_flush_flags(env, env->cc_op);
env->cc_op = CC_OP_FLAGS;
env->sr = (env->sr & 0xffe0)
| env->cc_dest | (env->cc_x << 4);
#elif defined(TARGET_MICROBLAZE)
#elif defined(TARGET_MIPS)
#elif defined(TARGET_SH4)
#elif defined(TARGET_ALPHA)
#elif defined(TARGET_CRIS)
#elif defined(TARGET_S390X)
/* XXXXX */
#else
#error unsupported target CPU
#endif
/* restore global registers */
barrier();
env = (void *) saved_env_reg;
/* fail safe : never use cpu_single_env outside cpu_exec() */
cpu_single_env = NULL;
return ret;
}
/* must only be called from the generated code as an exception can be
generated */
void tb_invalidate_page_range(target_ulong start, target_ulong end)
{
/* XXX: cannot enable it yet because it yields to MMU exception
where NIP != read address on PowerPC */
#if 0
target_ulong phys_addr;
phys_addr = get_phys_addr_code(env, start);
tb_invalidate_phys_page_range(phys_addr, phys_addr + end - start, 0);
#endif
}
#if defined(TARGET_I386) && defined(CONFIG_USER_ONLY)
void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
{
CPUX86State *saved_env;
saved_env = env;
env = s;
if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
selector &= 0xffff;
cpu_x86_load_seg_cache(env, seg_reg, selector,
(selector << 4), 0xffff, 0);
} else {
helper_load_seg(seg_reg, selector);
}
env = saved_env;
}
void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
{
CPUX86State *saved_env;
saved_env = env;
env = s;
helper_fsave(ptr, data32);
env = saved_env;
}
void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
{
CPUX86State *saved_env;
saved_env = env;
env = s;
helper_frstor(ptr, data32);
env = saved_env;
}
#endif /* TARGET_I386 */
#if !defined(CONFIG_SOFTMMU)
#if defined(TARGET_I386)
#define EXCEPTION_ACTION raise_exception_err(env->exception_index, env->error_code)
#else
#define EXCEPTION_ACTION cpu_loop_exit()
#endif
/* 'pc' is the host PC at which the exception was raised. 'address' is
the effective address of the memory exception. 'is_write' is 1 if a
write caused the exception and otherwise 0'. 'old_set' is the
signal set which should be restored */
static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
int is_write, sigset_t *old_set,
void *puc)
{
TranslationBlock *tb;
int ret;
if (cpu_single_env)
env = cpu_single_env; /* XXX: find a correct solution for multithread */
#if defined(DEBUG_SIGNAL)
qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
pc, address, is_write, *(unsigned long *)old_set);
#endif
/* XXX: locking issue */
if (is_write && page_unprotect(h2g(address), pc, puc)) {
return 1;
}
/* see if it is an MMU fault */
ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
if (ret < 0)
return 0; /* not an MMU fault */
if (ret == 0)
return 1; /* the MMU fault was handled without causing real CPU fault */
/* now we have a real cpu fault */
tb = tb_find_pc(pc);
if (tb) {
/* the PC is inside the translated code. It means that we have
a virtual CPU fault */
cpu_restore_state(tb, env, pc, puc);
}
/* we restore the process signal mask as the sigreturn should
do it (XXX: use sigsetjmp) */
sigprocmask(SIG_SETMASK, old_set, NULL);
EXCEPTION_ACTION;
/* never comes here */
return 1;
}
#if defined(__i386__)
#if defined(__APPLE__)
# include <sys/ucontext.h>
# define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
# define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
# define ERROR_sig(context) ((context)->uc_mcontext->es.err)
# define MASK_sig(context) ((context)->uc_sigmask)
#elif defined (__NetBSD__)
# include <ucontext.h>
# define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
# define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
# define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
# define MASK_sig(context) ((context)->uc_sigmask)
#elif defined (__FreeBSD__) || defined(__DragonFly__)
# include <ucontext.h>
# define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext.mc_eip))
# define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
# define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
# define MASK_sig(context) ((context)->uc_sigmask)
#elif defined(__OpenBSD__)
# define EIP_sig(context) ((context)->sc_eip)
# define TRAP_sig(context) ((context)->sc_trapno)
# define ERROR_sig(context) ((context)->sc_err)
# define MASK_sig(context) ((context)->sc_mask)
#else
# define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
# define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
# define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
# define MASK_sig(context) ((context)->uc_sigmask)
#endif
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
#if defined(__NetBSD__) || defined (__FreeBSD__) || defined(__DragonFly__)
ucontext_t *uc = puc;
#elif defined(__OpenBSD__)
struct sigcontext *uc = puc;
#else
struct ucontext *uc = puc;
#endif
unsigned long pc;
int trapno;
#ifndef REG_EIP
/* for glibc 2.1 */
#define REG_EIP EIP
#define REG_ERR ERR
#define REG_TRAPNO TRAPNO
#endif
pc = EIP_sig(uc);
trapno = TRAP_sig(uc);
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
trapno == 0xe ?
(ERROR_sig(uc) >> 1) & 1 : 0,
&MASK_sig(uc), puc);
}
#elif defined(__x86_64__)
#ifdef __NetBSD__
#define PC_sig(context) _UC_MACHINE_PC(context)
#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
#define MASK_sig(context) ((context)->uc_sigmask)
#elif defined(__OpenBSD__)
#define PC_sig(context) ((context)->sc_rip)
#define TRAP_sig(context) ((context)->sc_trapno)
#define ERROR_sig(context) ((context)->sc_err)
#define MASK_sig(context) ((context)->sc_mask)
#elif defined (__FreeBSD__) || defined(__DragonFly__)
#include <ucontext.h>
#define PC_sig(context) (*((unsigned long*)&(context)->uc_mcontext.mc_rip))
#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
#define MASK_sig(context) ((context)->uc_sigmask)
#else
#define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
#define MASK_sig(context) ((context)->uc_sigmask)
#endif
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
unsigned long pc;
#if defined(__NetBSD__) || defined (__FreeBSD__) || defined(__DragonFly__)
ucontext_t *uc = puc;
#elif defined(__OpenBSD__)
struct sigcontext *uc = puc;
#else
struct ucontext *uc = puc;
#endif
pc = PC_sig(uc);
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
TRAP_sig(uc) == 0xe ?
(ERROR_sig(uc) >> 1) & 1 : 0,
&MASK_sig(uc), puc);
}
#elif defined(_ARCH_PPC)
/***********************************************************************
* signal context platform-specific definitions
* From Wine
*/
#ifdef linux
/* All Registers access - only for local access */
# define REG_sig(reg_name, context) ((context)->uc_mcontext.regs->reg_name)
/* Gpr Registers access */
# define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
# define IAR_sig(context) REG_sig(nip, context) /* Program counter */
# define MSR_sig(context) REG_sig(msr, context) /* Machine State Register (Supervisor) */
# define CTR_sig(context) REG_sig(ctr, context) /* Count register */
# define XER_sig(context) REG_sig(xer, context) /* User's integer exception register */
# define LR_sig(context) REG_sig(link, context) /* Link register */
# define CR_sig(context) REG_sig(ccr, context) /* Condition register */
/* Float Registers access */
# define FLOAT_sig(reg_num, context) (((double*)((char*)((context)->uc_mcontext.regs+48*4)))[reg_num])
# define FPSCR_sig(context) (*(int*)((char*)((context)->uc_mcontext.regs+(48+32*2)*4)))
/* Exception Registers access */
# define DAR_sig(context) REG_sig(dar, context)
# define DSISR_sig(context) REG_sig(dsisr, context)
# define TRAP_sig(context) REG_sig(trap, context)
#endif /* linux */
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <ucontext.h>
# define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
# define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
# define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
# define XER_sig(context) ((context)->uc_mcontext.mc_xer)
# define LR_sig(context) ((context)->uc_mcontext.mc_lr)
# define CR_sig(context) ((context)->uc_mcontext.mc_cr)
/* Exception Registers access */
# define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
# define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
# define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
#endif /* __FreeBSD__|| __FreeBSD_kernel__ */
#ifdef __APPLE__
# include <sys/ucontext.h>
typedef struct ucontext SIGCONTEXT;
/* All Registers access - only for local access */
# define REG_sig(reg_name, context) ((context)->uc_mcontext->ss.reg_name)
# define FLOATREG_sig(reg_name, context) ((context)->uc_mcontext->fs.reg_name)
# define EXCEPREG_sig(reg_name, context) ((context)->uc_mcontext->es.reg_name)
# define VECREG_sig(reg_name, context) ((context)->uc_mcontext->vs.reg_name)
/* Gpr Registers access */
# define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
# define IAR_sig(context) REG_sig(srr0, context) /* Program counter */
# define MSR_sig(context) REG_sig(srr1, context) /* Machine State Register (Supervisor) */
# define CTR_sig(context) REG_sig(ctr, context)
# define XER_sig(context) REG_sig(xer, context) /* Link register */
# define LR_sig(context) REG_sig(lr, context) /* User's integer exception register */
# define CR_sig(context) REG_sig(cr, context) /* Condition register */
/* Float Registers access */
# define FLOAT_sig(reg_num, context) FLOATREG_sig(fpregs[reg_num], context)
# define FPSCR_sig(context) ((double)FLOATREG_sig(fpscr, context))
/* Exception Registers access */
# define DAR_sig(context) EXCEPREG_sig(dar, context) /* Fault registers for coredump */
# define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
# define TRAP_sig(context) EXCEPREG_sig(exception, context) /* number of powerpc exception taken */
#endif /* __APPLE__ */
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
ucontext_t *uc = puc;
#else
struct ucontext *uc = puc;
#endif
unsigned long pc;
int is_write;
pc = IAR_sig(uc);
is_write = 0;
#if 0
/* ppc 4xx case */
if (DSISR_sig(uc) & 0x00800000)
is_write = 1;
#else
if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000))
is_write = 1;
#endif
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
is_write, &uc->uc_sigmask, puc);
}
#elif defined(__alpha__)
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
struct ucontext *uc = puc;
uint32_t *pc = uc->uc_mcontext.sc_pc;
uint32_t insn = *pc;
int is_write = 0;
/* XXX: need kernel patch to get write flag faster */
switch (insn >> 26) {
case 0x0d: // stw
case 0x0e: // stb
case 0x0f: // stq_u
case 0x24: // stf
case 0x25: // stg
case 0x26: // sts
case 0x27: // stt
case 0x2c: // stl
case 0x2d: // stq
case 0x2e: // stl_c
case 0x2f: // stq_c
is_write = 1;
}
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
is_write, &uc->uc_sigmask, puc);
}
#elif defined(__sparc__)
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
int is_write;
uint32_t insn;
#if !defined(__arch64__) || defined(CONFIG_SOLARIS)
uint32_t *regs = (uint32_t *)(info + 1);
void *sigmask = (regs + 20);
/* XXX: is there a standard glibc define ? */
unsigned long pc = regs[1];
#else
#ifdef __linux__
struct sigcontext *sc = puc;
unsigned long pc = sc->sigc_regs.tpc;
void *sigmask = (void *)sc->sigc_mask;
#elif defined(__OpenBSD__)
struct sigcontext *uc = puc;
unsigned long pc = uc->sc_pc;
void *sigmask = (void *)(long)uc->sc_mask;
#endif
#endif
/* XXX: need kernel patch to get write flag faster */
is_write = 0;
insn = *(uint32_t *)pc;
if ((insn >> 30) == 3) {
switch((insn >> 19) & 0x3f) {
case 0x05: // stb
case 0x15: // stba
case 0x06: // sth
case 0x16: // stha
case 0x04: // st
case 0x14: // sta
case 0x07: // std
case 0x17: // stda
case 0x0e: // stx
case 0x1e: // stxa
case 0x24: // stf
case 0x34: // stfa
case 0x27: // stdf
case 0x37: // stdfa
case 0x26: // stqf
case 0x36: // stqfa
case 0x25: // stfsr
case 0x3c: // casa
case 0x3e: // casxa
is_write = 1;
break;
}
}
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
is_write, sigmask, NULL);
}
#elif defined(__arm__)
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
struct ucontext *uc = puc;
unsigned long pc;
int is_write;
#if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
pc = uc->uc_mcontext.gregs[R15];
#else
pc = uc->uc_mcontext.arm_pc;
#endif
/* XXX: compute is_write */
is_write = 0;
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
is_write,
&uc->uc_sigmask, puc);
}
#elif defined(__mc68000)
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
struct ucontext *uc = puc;
unsigned long pc;
int is_write;
pc = uc->uc_mcontext.gregs[16];
/* XXX: compute is_write */
is_write = 0;
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
is_write,
&uc->uc_sigmask, puc);
}
#elif defined(__ia64)
#ifndef __ISR_VALID
/* This ought to be in <bits/siginfo.h>... */
# define __ISR_VALID 1
#endif
int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
{
siginfo_t *info = pinfo;
struct ucontext *uc = puc;
unsigned long ip;
int is_write = 0;
ip = uc->uc_mcontext.sc_ip;
switch (host_signum) {
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
case SIGTRAP:
if (info->si_code && (info->si_segvflags & __ISR_VALID))
/* ISR.W (write-access) is bit 33: */
is_write = (info->si_isr >> 33) & 1;
break;
default:
break;
}
return handle_cpu_signal(ip, (unsigned long)info->si_addr,
is_write,
(sigset_t *)&uc->uc_sigmask, puc);
}
#elif defined(__s390__)
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
struct ucontext *uc = puc;
unsigned long pc;
uint16_t *pinsn;
int is_write = 0;
pc = uc->uc_mcontext.psw.addr;
/* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
of the normal 2 arguments. The 3rd argument contains the "int_code"
from the hardware which does in fact contain the is_write value.
The rt signal handler, as far as I can tell, does not give this value
at all. Not that we could get to it from here even if it were. */
/* ??? This is not even close to complete, since it ignores all
of the read-modify-write instructions. */
pinsn = (uint16_t *)pc;
switch (pinsn[0] >> 8) {
case 0x50: /* ST */
case 0x42: /* STC */
case 0x40: /* STH */
is_write = 1;
break;
case 0xc4: /* RIL format insns */
switch (pinsn[0] & 0xf) {
case 0xf: /* STRL */
case 0xb: /* STGRL */
case 0x7: /* STHRL */
is_write = 1;
}
break;
case 0xe3: /* RXY format insns */
switch (pinsn[2] & 0xff) {
case 0x50: /* STY */
case 0x24: /* STG */
case 0x72: /* STCY */
case 0x70: /* STHY */
case 0x8e: /* STPQ */
case 0x3f: /* STRVH */
case 0x3e: /* STRV */
case 0x2f: /* STRVG */
is_write = 1;
}
break;
}
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
is_write, &uc->uc_sigmask, puc);
}
#elif defined(__mips__)
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
struct ucontext *uc = puc;
greg_t pc = uc->uc_mcontext.pc;
int is_write;
/* XXX: compute is_write */
is_write = 0;
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
is_write, &uc->uc_sigmask, puc);
}
#elif defined(__hppa__)
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
struct siginfo *info = pinfo;
struct ucontext *uc = puc;
unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
uint32_t insn = *(uint32_t *)pc;
int is_write = 0;
/* XXX: need kernel patch to get write flag faster. */
switch (insn >> 26) {
case 0x1a: /* STW */
case 0x19: /* STH */
case 0x18: /* STB */
case 0x1b: /* STWM */
is_write = 1;
break;
case 0x09: /* CSTWX, FSTWX, FSTWS */
case 0x0b: /* CSTDX, FSTDX, FSTDS */
/* Distinguish from coprocessor load ... */
is_write = (insn >> 9) & 1;
break;
case 0x03:
switch ((insn >> 6) & 15) {
case 0xa: /* STWS */
case 0x9: /* STHS */
case 0x8: /* STBS */
case 0xe: /* STWAS */
case 0xc: /* STBYS */
is_write = 1;
}
break;
}
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
is_write, &uc->uc_sigmask, puc);
}
#else
#error host CPU specific signal handler needed
#endif
#endif /* !defined(CONFIG_SOFTMMU) */
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