qmp-commands: move 'ringbuf-write' doc to schema

[qemu.git] / user-exec.c

diff --git a/user-exec.c b/user-exec.c
index c71acbc5031b97d389a987b8df4e3e1318ecceaa..6db075884d917f9a9fa7c78bfe1800ca5ebb0cb3 100644 (file)
--- a/user-exec.c
+++ b/user-exec.c
@@ -16,10 +16,14 @@
  * 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/>.
  */
  * 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 "qemu/osdep.h"

 #include "cpu.h"
 #include "disas/disas.h"
 #include "cpu.h"
 #include "disas/disas.h"

+#include "exec/exec-all.h"

 #include "tcg.h"
 #include "tcg.h"

+#include "qemu/bitops.h"
+#include "exec/cpu_ldst.h"
+#include "translate-all.h"

 
 #undef EAX
 #undef ECX
 
 #undef EAX
 #undef ECX


@@ -30,47 +34,20 @@
 #undef ESI
 #undef EDI
 #undef EIP
 #undef ESI
 #undef EDI
 #undef EIP

-#include <signal.h>

 #ifdef __linux__
 #include <sys/ucontext.h>
 #endif
 
 //#define DEBUG_SIGNAL
 
 #ifdef __linux__
 #include <sys/ucontext.h>
 #endif
 
 //#define DEBUG_SIGNAL
 

-static void exception_action(CPUArchState *env1)
-{
-#if defined(TARGET_I386)
-    raise_exception_err(env1, env1->exception_index, env1->error_code);
-#else
-    cpu_loop_exit(env1);
-#endif
-}
-

 /* exit the current TB from a signal handler. The host registers are
    restored in a state compatible with the CPU emulator
  */
 /* 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(CPUArchState *env1, 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
-    }
-    env1->exception_index = -1;
-    longjmp(env1->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
 }
 
 /* 'pc' is the host PC at which the exception was raised. 'address' is


@@ -78,37 +55,64 @@ void cpu_resume_from_signal(CPUArchState *env1, void *puc)
    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,
    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;
+    CPUClass *cc;

     int ret;
 
 #if defined(DEBUG_SIGNAL)
     int ret;
 
 #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);
+    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 */
 #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(current_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 */
     /* see if it is an MMU fault */

-    ret = cpu_handle_mmu_fault(cpu_single_env, address, is_write,
-                               MMU_USER_IDX);
+    g_assert(cc->handle_mmu_fault);
+    ret = cc->handle_mmu_fault(cpu, address, is_write, MMU_USER_IDX);

     if (ret < 0) {
         return 0; /* not an MMU fault */
     }
     if (ret == 0) {
         return 1; /* the MMU fault was handled without causing real CPU fault */
     }
     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 */
-    cpu_restore_state(cpu_single_env, 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);
     sigprocmask(SIG_SETMASK, old_set, NULL);

-    exception_action(cpu_single_env);
+    cpu_loop_exit(cpu);

 
     /* never comes here */
     return 1;
 
     /* never comes here */
     return 1;


@@ -116,14 +120,7 @@ static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
 
 #if defined(__i386__)
 
 
 #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])
 #include <ucontext.h>
 
 #define EIP_sig(context)     ((context)->uc_mcontext.__gregs[_REG_EIP])


@@ -174,7 +171,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                              trapno == 0xe ?
                              (ERROR_sig(uc) >> 1) & 1 : 0,
     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__)
 }
 
 #elif defined(__x86_64__)


@@ -220,7 +217,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                              TRAP_sig(uc) == 0xe ?
                              (ERROR_sig(uc) >> 1) & 1 : 0,
     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)
 }
 
 #elif defined(_ARCH_PPC)


@@ -273,44 +270,6 @@ int cpu_signal_handler(int host_signum, void *pinfo,
 #define TRAP_sig(context)              ((context)->uc_mcontext.mc_exc)
 #endif /* __FreeBSD__|| __FreeBSD_kernel__ */
 
 #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)
 {
 int cpu_signal_handler(int host_signum, void *pinfo,
                        void *puc)
 {


@@ -336,7 +295,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     }
 #endif
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
     }
 #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__)
 }
 
 #elif defined(__alpha__)


@@ -367,7 +326,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     }
 
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
     }
 
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,

-                             is_write, &uc->uc_sigmask, puc);
+                             is_write, &uc->uc_sigmask);

 }
 #elif defined(__sparc__)
 
 }
 #elif defined(__sparc__)
 


@@ -391,6 +350,10 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     struct sigcontext *uc = puc;
     unsigned long pc = uc->sc_pc;
     void *sigmask = (void *)(long)uc->sc_mask;
     struct sigcontext *uc = puc;
     unsigned long pc = uc->sc_pc;
     void *sigmask = (void *)(long)uc->sc_mask;

+#elif defined(__NetBSD__)
+    ucontext_t *uc = puc;
+    unsigned long pc = _UC_MACHINE_PC(uc);
+    void *sigmask = (void *)&uc->uc_sigmask;

 #endif
 #endif
 
 #endif
 #endif
 


@@ -423,47 +386,70 @@ int cpu_signal_handler(int host_signum, void *pinfo,
         }
     }
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
         }
     }
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,

-                             is_write, sigmask, NULL);
+                             is_write, sigmask);

 }
 
 #elif defined(__arm__)
 
 }
 
 #elif defined(__arm__)
 

+#if defined(__NetBSD__)
+#include <ucontext.h>
+#endif
+

 int cpu_signal_handler(int host_signum, void *pinfo,
                        void *puc)
 {
     siginfo_t *info = pinfo;
 int cpu_signal_handler(int host_signum, void *pinfo,
                        void *puc)
 {
     siginfo_t *info = pinfo;

+#if defined(__NetBSD__)
+    ucontext_t *uc = puc;
+#else

     struct ucontext *uc = puc;
     struct ucontext *uc = puc;

+#endif

     unsigned long pc;
     int is_write;
 
     unsigned long pc;
     int is_write;
 

-#if defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
+#if defined(__NetBSD__)
+    pc = uc->uc_mcontext.__gregs[_REG_R15];
+#elif defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))

     pc = uc->uc_mcontext.gregs[R15];
 #else
     pc = uc->uc_mcontext.arm_pc;
 #endif
     pc = uc->uc_mcontext.gregs[R15];
 #else
     pc = uc->uc_mcontext.arm_pc;
 #endif

-    /* XXX: compute is_write */
-    is_write = 0;
+
+    /* error_code is the FSR value, in which bit 11 is WnR (assuming a v6 or
+     * later processor; on v5 we will always report this as a read).
+     */
+    is_write = extract32(uc->uc_mcontext.error_code, 11, 1);

     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                              is_write,
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                              is_write,

-                             &uc->uc_sigmask, puc);
+                             &uc->uc_sigmask);

 }
 
 }
 

-#elif defined(__mc68000)
+#elif defined(__aarch64__)

 
 

-int cpu_signal_handler(int host_signum, void *pinfo,
-                       void *puc)
+int cpu_signal_handler(int host_signum, void *pinfo, void *puc)

 {
     siginfo_t *info = pinfo;
     struct ucontext *uc = puc;
 {
     siginfo_t *info = pinfo;
     struct ucontext *uc = puc;

-    unsigned long pc;
-    int is_write;
+    uintptr_t pc = uc->uc_mcontext.pc;
+    uint32_t insn = *(uint32_t *)pc;
+    bool 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);
+    /* XXX: need kernel patch to get write flag faster.  */
+    is_write = (   (insn & 0xbfff0000) == 0x0c000000   /* C3.3.1 */
+                || (insn & 0xbfe00000) == 0x0c800000   /* C3.3.2 */
+                || (insn & 0xbfdf0000) == 0x0d000000   /* C3.3.3 */
+                || (insn & 0xbfc00000) == 0x0d800000   /* C3.3.4 */
+                || (insn & 0x3f400000) == 0x08000000   /* C3.3.6 */
+                || (insn & 0x3bc00000) == 0x39000000   /* C3.3.13 */
+                || (insn & 0x3fc00000) == 0x3d800000   /* ... 128bit */
+                /* Ingore bits 10, 11 & 21, controlling indexing.  */
+                || (insn & 0x3bc00000) == 0x38000000   /* C3.3.8-12 */
+                || (insn & 0x3fe00000) == 0x3c800000   /* ... 128bit */
+                /* Ignore bits 23 & 24, controlling indexing.  */
+                || (insn & 0x3a400000) == 0x28000000); /* C3.3.7,14-16 */
+
+    return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
+                             is_write, &uc->uc_sigmask);

 }
 
 #elif defined(__ia64)
 }
 
 #elif defined(__ia64)


@@ -498,7 +484,7 @@ int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
     }
     return handle_cpu_signal(ip, (unsigned long)info->si_addr,
                              is_write,
     }
     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__)
 }
 
 #elif defined(__s390__)


@@ -551,7 +537,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
         break;
     }
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
         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__)
 }
 
 #elif defined(__mips__)


@@ -567,49 +553,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     /* XXX: compute is_write */
     is_write = 0;
     return handle_cpu_signal(pc, (unsigned long)info->si_addr,
     /* 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
 }
 
 #else