accel/tcg: move user-exec to accel/tcg/

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20170911213328.9701-3-f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

3 files changed, 612 insertions, 0 deletions

diff --git a/accel/tcg/Makefile.objs b/accel/tcg/Makefile.objs
index 22642e6f75..f2422d0fb3 100644
--- a/accel/tcg/Makefile.objs
+++ b/accel/tcg/Makefile.objs
@@ -2,3 +2,6 @@ obj-$(CONFIG_SOFTMMU) += tcg-all.o
 obj-$(CONFIG_SOFTMMU) += cputlb.o
 obj-y += cpu-exec.o cpu-exec-common.o translate-all.o
 obj-y += translator.o
+
+obj-$(CONFIG_USER_ONLY) += user-exec.o
+obj-$(call lnot,$(CONFIG_SOFTMMU)) += user-exec-stub.o
diff --git a/accel/tcg/user-exec-stub.c b/accel/tcg/user-exec-stub.c
new file mode 100644
index 0000000000..dbcf1ade9c
--- /dev/null
+++ b/accel/tcg/user-exec-stub.c
@@ -0,0 +1,34 @@
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qom/cpu.h"
+#include "sysemu/replay.h"
+
+void cpu_resume(CPUState *cpu)
+{
+}
+
+void qemu_init_vcpu(CPUState *cpu)
+{
+}
+
+/* User mode emulation does not support record/replay yet.  */
+
+bool replay_exception(void)
+{
+    return true;
+}
+
+bool replay_has_exception(void)
+{
+    return false;
+}
+
+bool replay_interrupt(void)
+{
+    return true;
+}
+
+bool replay_has_interrupt(void)
+{
+    return false;
+}
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
new file mode 100644
index 0000000000..2a975eaf69
--- /dev/null
+++ b/accel/tcg/user-exec.c
@@ -0,0 +1,575 @@
+/*
+ *  User emulator execution
+ *
+ *  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 "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"
+#include "translate-all.h"
+
+#undef EAX
+#undef ECX
+#undef EDX
+#undef EBX
+#undef ESP
+#undef EBP
+#undef ESI
+#undef EDI
+#undef EIP
+#ifdef __linux__
+#include <sys/ucontext.h>
+#endif
+
+//#define DEBUG_SIGNAL
+
+/* exit the current TB from a signal handler. The host registers are
+   restored in a state compatible with the CPU emulator
+ */
+static void cpu_exit_tb_from_sighandler(CPUState *cpu, sigset_t *old_set)
+{
+    /* 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
+   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(uintptr_t pc, unsigned long address,
+                                    int is_write, sigset_t *old_set)
+{
+    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)) {
+        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);
+
+    cc = CPU_GET_CLASS(cpu);
+    /* see if it is an MMU fault */
+    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 */
+    }
+
+    /* 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);
+    cpu_loop_exit(cpu);
+
+    /* never comes here */
+    return 1;
+}
+
+#if defined(__i386__)
+
+#if 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
+    ucontext_t *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));
+}
+
+#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
+    ucontext_t *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));
+}
+
+#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)
+/* Program counter */
+#define IAR_sig(context)                       REG_sig(nip, context)
+/* Machine State Register (Supervisor) */
+#define MSR_sig(context)                       REG_sig(msr, context)
+/* Count register */
+#define CTR_sig(context)                       REG_sig(ctr, context)
+/* User's integer exception register */
+#define XER_sig(context)                       REG_sig(xer, context)
+/* Link register */
+#define LR_sig(context)                        REG_sig(link, context)
+/* Condition register */
+#define CR_sig(context)                        REG_sig(ccr, context)
+
+/* 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__ */
+
+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
+    ucontext_t *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);
+}
+
+#elif defined(__alpha__)
+
+int cpu_signal_handler(int host_signum, void *pinfo,
+                           void *puc)
+{
+    siginfo_t *info = pinfo;
+    ucontext_t *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);
+}
+#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;
+#elif defined(__NetBSD__)
+    ucontext_t *uc = puc;
+    unsigned long pc = _UC_MACHINE_PC(uc);
+    void *sigmask = (void *)&uc->uc_sigmask;
+#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);
+}
+
+#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;
+#if defined(__NetBSD__)
+    ucontext_t *uc = puc;
+#else
+    ucontext_t *uc = puc;
+#endif
+    unsigned long pc;
+    int is_write;
+
+#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
+
+    /* 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,
+                             &uc->uc_sigmask);
+}
+
+#elif defined(__aarch64__)
+
+int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
+{
+    siginfo_t *info = pinfo;
+    ucontext_t *uc = puc;
+    uintptr_t pc = uc->uc_mcontext.pc;
+    uint32_t insn = *(uint32_t *)pc;
+    bool is_write;
+
+    /* 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)
+
+#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;
+    ucontext_t *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);
+}
+
+#elif defined(__s390__)
+
+int cpu_signal_handler(int host_signum, void *pinfo,
+                       void *puc)
+{
+    siginfo_t *info = pinfo;
+    ucontext_t *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);
+}
+
+#elif defined(__mips__)
+
+int cpu_signal_handler(int host_signum, void *pinfo,
+                       void *puc)
+{
+    siginfo_t *info = pinfo;
+    ucontext_t *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);
+}
+
+#else
+
+#error host CPU specific signal handler needed
+
+#endif