#include "qemu/osdep.h"
#include "cpu.h"
#include "disas/disas.h"
+#include "exec/exec-all.h"
#include "tcg.h"
#include "qemu/bitops.h"
#include "exec/cpu_ldst.h"
//#define DEBUG_SIGNAL
-static void exception_action(CPUState *cpu)
-{
-#if defined(TARGET_I386)
- X86CPU *x86_cpu = X86_CPU(cpu);
- CPUX86State *env1 = &x86_cpu->env;
-
- raise_exception_err(env1, cpu->exception_index, env1->error_code);
-#else
- cpu_loop_exit(cpu);
-#endif
-}
-
/* 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 *cpu, void *puc)
+static void cpu_exit_tb_from_sighandler(CPUState *cpu, sigset_t *old_set)
{
-#ifdef __linux__
- struct ucontext *uc = puc;
-#elif defined(__OpenBSD__)
- struct sigcontext *uc = puc;
-#endif
-
- 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
- }
- cpu->exception_index = -1;
- siglongjmp(cpu->jmp_env, 1);
+ /* XXX: use siglongjmp ? */
+ sigprocmask(SIG_SETMASK, old_set, NULL);
+ cpu_loop_exit_noexc(cpu);
}
/* 'pc' is the host PC at which the exception was raised. 'address' is
write caused the exception and otherwise 0'. 'old_set' is the
signal set which should be restored */
static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
- int is_write, sigset_t *old_set,
- void *puc)
+ int is_write, sigset_t *old_set)
{
- CPUState *cpu;
+ CPUState *cpu = current_cpu;
CPUClass *cc;
int ret;
+ /* For synchronous signals we expect to be coming from the vCPU
+ * thread (so current_cpu should be valid) and either from running
+ * code or during translation which can fault as we cross pages.
+ *
+ * If neither is true then something has gone wrong and we should
+ * abort rather than try and restart the vCPU execution.
+ */
+ if (!cpu || !cpu->running) {
+ printf("qemu:%s received signal outside vCPU context @ pc=0x%"
+ PRIxPTR "\n", __func__, pc);
+ abort();
+ }
+
#if defined(DEBUG_SIGNAL)
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 && h2g_valid(address)
- && page_unprotect(h2g(address), pc, puc)) {
- return 1;
+ if (is_write && h2g_valid(address)) {
+ switch (page_unprotect(h2g(address), pc)) {
+ case 0:
+ /* Fault not caused by a page marked unwritable to protect
+ * cached translations, must be the guest binary's problem
+ */
+ break;
+ case 1:
+ /* Fault caused by protection of cached translation; TBs
+ * invalidated, so resume execution
+ */
+ return 1;
+ case 2:
+ /* Fault caused by protection of cached translation, and the
+ * currently executing TB was modified and must be exited
+ * immediately.
+ */
+ cpu_exit_tb_from_sighandler(cpu, old_set);
+ g_assert_not_reached();
+ default:
+ g_assert_not_reached();
+ }
}
/* Convert forcefully to guest address space, invalid addresses
are still valid segv ones */
address = h2g_nocheck(address);
- cpu = current_cpu;
cc = CPU_GET_CLASS(cpu);
/* see if it is an MMU fault */
g_assert(cc->handle_mmu_fault);
if (ret == 0) {
return 1; /* the MMU fault was handled without causing real CPU fault */
}
- /* now we have a real cpu fault */
- cpu_restore_state(cpu, pc);
- /* we restore the process signal mask as the sigreturn should
- do it (XXX: use sigsetjmp) */
+ /* Now we have a real cpu fault. Since this is the exact location of
+ * the exception, we must undo the adjustment done by cpu_restore_state
+ * for handling call return addresses. */
+ cpu_restore_state(cpu, pc + GETPC_ADJ);
+
sigprocmask(SIG_SETMASK, old_set, NULL);
- exception_action(cpu);
+ cpu_loop_exit(cpu);
/* 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__)
+#if defined(__NetBSD__)
#include <ucontext.h>
#define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
trapno == 0xe ?
(ERROR_sig(uc) >> 1) & 1 : 0,
- &MASK_sig(uc), puc);
+ &MASK_sig(uc));
}
#elif defined(__x86_64__)
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
TRAP_sig(uc) == 0xe ?
(ERROR_sig(uc) >> 1) & 1 : 0,
- &MASK_sig(uc), puc);
+ &MASK_sig(uc));
}
#elif defined(_ARCH_PPC)
#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)
-/* Program counter */
-#define IAR_sig(context) REG_sig(srr0, context)
-/* Machine State Register (Supervisor) */
-#define MSR_sig(context) REG_sig(srr1, context)
-#define CTR_sig(context) REG_sig(ctr, context)
-/* Link register */
-#define XER_sig(context) REG_sig(xer, context)
-/* User's integer exception register */
-#define LR_sig(context) REG_sig(lr, context)
-/* Condition register */
-#define CR_sig(context) REG_sig(cr, context)
-/* 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 */
-/* Fault registers for coredump */
-#define DAR_sig(context) EXCEPREG_sig(dar, context)
-#define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
-/* number of powerpc exception taken */
-#define TRAP_sig(context) EXCEPREG_sig(exception, context)
-#endif /* __APPLE__ */
-
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
}
#endif
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
- is_write, &uc->uc_sigmask, puc);
+ is_write, &uc->uc_sigmask);
}
#elif defined(__alpha__)
}
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
- is_write, &uc->uc_sigmask, puc);
+ is_write, &uc->uc_sigmask);
}
#elif defined(__sparc__)
}
}
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
- is_write, sigmask, NULL);
+ is_write, sigmask);
}
#elif defined(__arm__)
is_write = extract32(uc->uc_mcontext.error_code, 11, 1);
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
is_write,
- &uc->uc_sigmask, puc);
+ &uc->uc_sigmask);
}
#elif defined(__aarch64__)
|| (insn & 0x3a400000) == 0x28000000); /* C3.3.7,14-16 */
return handle_cpu_signal(pc, (uintptr_t)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);
+ is_write, &uc->uc_sigmask);
}
#elif defined(__ia64)
}
return handle_cpu_signal(ip, (unsigned long)info->si_addr,
is_write,
- (sigset_t *)&uc->uc_sigmask, puc);
+ (sigset_t *)&uc->uc_sigmask);
}
#elif defined(__s390__)
break;
}
return handle_cpu_signal(pc, (unsigned long)info->si_addr,
- is_write, &uc->uc_sigmask, puc);
+ is_write, &uc->uc_sigmask);
}
#elif defined(__mips__)
/* 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)
-{
- siginfo_t *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);
+ is_write, &uc->uc_sigmask);
}
#else
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