Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

11 files changed, 901 insertions, 0 deletions

diff --git a/bsd-user/i386/target_arch.h b/bsd-user/i386/target_arch.h
new file mode 100644
index 000000000..73e9a028f
--- /dev/null
+++ b/bsd-user/i386/target_arch.h
@@ -0,0 +1,31 @@
+/*
+ * Intel x86 specific prototypes for bsd-user
+ *
+ *  Copyright (c) 2013 Stacey D. Son
+ *
+ *  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/>.
+ */
+
+#ifndef _TARGET_ARCH_H_
+#define _TARGET_ARCH_H_
+
+/* target_arch_cpu.c */
+void bsd_i386_write_dt(void *ptr, unsigned long addr, unsigned long limit,
+                int flags);
+void bsd_i386_set_idt(int n, unsigned int dpl);
+void bsd_i386_set_idt_base(uint64_t base);
+
+#define target_cpu_set_tls(env, newtls)
+
+#endif /* ! _TARGET_ARCH_H_ */
diff --git a/bsd-user/i386/target_arch_cpu.c b/bsd-user/i386/target_arch_cpu.c
new file mode 100644
index 000000000..d349e4529
--- /dev/null
+++ b/bsd-user/i386/target_arch_cpu.c
@@ -0,0 +1,71 @@
+/*
+ *  i386 cpu related code
+ *
+ * Copyright (c) 2013 Stacey Son <sson@FreeBSD.org>
+ *
+ *  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 <sys/types.h>
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "qemu.h"
+#include "qemu/timer.h"
+
+#include "target_arch.h"
+
+static uint64_t *idt_table;
+
+uint64_t cpu_get_tsc(CPUX86State *env)
+{
+    return cpu_get_host_ticks();
+}
+
+void bsd_i386_write_dt(void *ptr, unsigned long addr, unsigned long limit,
+                     int flags)
+{
+    unsigned int e1, e2;
+    uint32_t *p;
+    e1 = (addr << 16) | (limit & 0xffff);
+    e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
+    e2 |= flags;
+    p = ptr;
+    p[0] = tswap32(e1);
+    p[1] = tswap32(e2);
+}
+
+
+static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
+                     uint32_t addr, unsigned int sel)
+{
+    uint32_t *p, e1, e2;
+    e1 = (addr & 0xffff) | (sel << 16);
+    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
+    p = ptr;
+    p[0] = tswap32(e1);
+    p[1] = tswap32(e2);
+}
+
+/* only dpl matters as we do only user space emulation */
+void bsd_i386_set_idt(int n, unsigned int dpl)
+{
+    set_gate(idt_table + n, 0, dpl, 0, 0);
+}
+
+void bsd_i386_set_idt_base(uint64_t base)
+{
+    idt_table = g2h_untagged(base);
+}
+
diff --git a/bsd-user/i386/target_arch_cpu.h b/bsd-user/i386/target_arch_cpu.h
new file mode 100644
index 000000000..b28602adb
--- /dev/null
+++ b/bsd-user/i386/target_arch_cpu.h
@@ -0,0 +1,207 @@
+/*
+ *  i386 cpu init and loop
+ *
+ *
+ *  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/>.
+ */
+
+#ifndef _TARGET_ARCH_CPU_H_
+#define _TARGET_ARCH_CPU_H_
+
+#include "target_arch.h"
+
+#define TARGET_DEFAULT_CPU_MODEL "qemu32"
+
+static inline void target_cpu_init(CPUX86State *env,
+        struct target_pt_regs *regs)
+{
+    uint64_t *gdt_table;
+
+    env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK;
+    env->hflags |= HF_PE_MASK | HF_CPL_MASK;
+    if (env->features[FEAT_1_EDX] & CPUID_SSE) {
+        env->cr[4] |= CR4_OSFXSR_MASK;
+        env->hflags |= HF_OSFXSR_MASK;
+    }
+
+    /* flags setup : we activate the IRQs by default as in user mode */
+    env->eflags |= IF_MASK;
+
+    /* register setup */
+    env->regs[R_EAX] = regs->eax;
+    env->regs[R_EBX] = regs->ebx;
+    env->regs[R_ECX] = regs->ecx;
+    env->regs[R_EDX] = regs->edx;
+    env->regs[R_ESI] = regs->esi;
+    env->regs[R_EDI] = regs->edi;
+    env->regs[R_EBP] = regs->ebp;
+    env->regs[R_ESP] = regs->esp;
+    env->eip = regs->eip;
+
+    /* interrupt setup */
+    env->idt.limit = 255;
+
+    env->idt.base = target_mmap(0, sizeof(uint64_t) * (env->idt.limit + 1),
+        PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+    bsd_i386_set_idt_base(env->idt.base);
+    bsd_i386_set_idt(0, 0);
+    bsd_i386_set_idt(1, 0);
+    bsd_i386_set_idt(2, 0);
+    bsd_i386_set_idt(3, 3);
+    bsd_i386_set_idt(4, 3);
+    bsd_i386_set_idt(5, 0);
+    bsd_i386_set_idt(6, 0);
+    bsd_i386_set_idt(7, 0);
+    bsd_i386_set_idt(8, 0);
+    bsd_i386_set_idt(9, 0);
+    bsd_i386_set_idt(10, 0);
+    bsd_i386_set_idt(11, 0);
+    bsd_i386_set_idt(12, 0);
+    bsd_i386_set_idt(13, 0);
+    bsd_i386_set_idt(14, 0);
+    bsd_i386_set_idt(15, 0);
+    bsd_i386_set_idt(16, 0);
+    bsd_i386_set_idt(17, 0);
+    bsd_i386_set_idt(18, 0);
+    bsd_i386_set_idt(19, 0);
+    bsd_i386_set_idt(0x80, 3);
+
+    /* segment setup */
+    env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES,
+            PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+    env->gdt.limit = sizeof(uint64_t) * TARGET_GDT_ENTRIES - 1;
+    gdt_table = g2h_untagged(env->gdt.base);
+
+    bsd_i386_write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
+            DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
+            (3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
+
+    bsd_i386_write_dt(&gdt_table[__USER_DS >> 3], 0, 0xfffff,
+            DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
+            (3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT));
+
+    cpu_x86_load_seg(env, R_CS, __USER_CS);
+    cpu_x86_load_seg(env, R_SS, __USER_DS);
+    cpu_x86_load_seg(env, R_DS, __USER_DS);
+    cpu_x86_load_seg(env, R_ES, __USER_DS);
+    cpu_x86_load_seg(env, R_FS, __USER_DS);
+    cpu_x86_load_seg(env, R_GS, __USER_DS);
+    /* This hack makes Wine work... */
+    env->segs[R_FS].selector = 0;
+}
+
+static inline void target_cpu_loop(CPUX86State *env)
+{
+    CPUState *cs = env_cpu(env);
+    int trapnr;
+    abi_ulong pc;
+    /* target_siginfo_t info; */
+
+    for (;;) {
+        cpu_exec_start(cs);
+        trapnr = cpu_exec(cs);
+        cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
+        switch (trapnr) {
+        case 0x80:
+            /* syscall from int $0x80 */
+            if (bsd_type == target_freebsd) {
+                abi_ulong params = (abi_ulong) env->regs[R_ESP] +
+                    sizeof(int32_t);
+                int32_t syscall_nr = env->regs[R_EAX];
+                int32_t arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8;
+
+                if (syscall_nr == TARGET_FREEBSD_NR_syscall) {
+                    get_user_s32(syscall_nr, params);
+                    params += sizeof(int32_t);
+                } else if (syscall_nr == TARGET_FREEBSD_NR___syscall) {
+                    get_user_s32(syscall_nr, params);
+                    params += sizeof(int64_t);
+                }
+                get_user_s32(arg1, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg2, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg3, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg4, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg5, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg6, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg7, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg8, params);
+                env->regs[R_EAX] = do_freebsd_syscall(env,
+                                                      syscall_nr,
+                                                      arg1,
+                                                      arg2,
+                                                      arg3,
+                                                      arg4,
+                                                      arg5,
+                                                      arg6,
+                                                      arg7,
+                                                      arg8);
+            } else { /* if (bsd_type == target_openbsd) */
+                env->regs[R_EAX] = do_openbsd_syscall(env,
+                                                      env->regs[R_EAX],
+                                                      env->regs[R_EBX],
+                                                      env->regs[R_ECX],
+                                                      env->regs[R_EDX],
+                                                      env->regs[R_ESI],
+                                                      env->regs[R_EDI],
+                                                      env->regs[R_EBP]);
+            }
+            if (((abi_ulong)env->regs[R_EAX]) >= (abi_ulong)(-515)) {
+                env->regs[R_EAX] = -env->regs[R_EAX];
+                env->eflags |= CC_C;
+            } else {
+                env->eflags &= ~CC_C;
+            }
+            break;
+
+        case EXCP_INTERRUPT:
+            /* just indicate that signals should be handled asap */
+            break;
+
+        case EXCP_ATOMIC:
+            cpu_exec_step_atomic(cs);
+            break;
+
+        default:
+            pc = env->segs[R_CS].base + env->eip;
+            fprintf(stderr, "qemu: 0x%08lx: unhandled CPU exception 0x%x - "
+                    "aborting\n", (long)pc, trapnr);
+            abort();
+        }
+        process_pending_signals(env);
+    }
+}
+
+static inline void target_cpu_clone_regs(CPUX86State *env, target_ulong newsp)
+{
+    if (newsp) {
+        env->regs[R_ESP] = newsp;
+    }
+    env->regs[R_EAX] = 0;
+}
+
+static inline void target_cpu_reset(CPUArchState *cpu)
+{
+    cpu_reset(env_cpu(cpu));
+}
+
+#endif /* ! _TARGET_ARCH_CPU_H_ */
diff --git a/bsd-user/i386/target_arch_elf.h b/bsd-user/i386/target_arch_elf.h
new file mode 100644
index 000000000..eb760e07f
--- /dev/null
+++ b/bsd-user/i386/target_arch_elf.h
@@ -0,0 +1,35 @@
+/*
+ *  i386 ELF definitions
+ *
+ *  Copyright (c) 2013 Stacey D. Son
+ *
+ *  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/>.
+ */
+#ifndef _TARGET_ARCH_ELF_H_
+#define _TARGET_ARCH_ELF_H_
+
+#define ELF_START_MMAP 0x80000000
+#define ELF_ET_DYN_LOAD_ADDR    0x01001000
+#define elf_check_arch(x) (((x) == EM_386) || ((x) == EM_486))
+
+#define ELF_HWCAP       0 /* FreeBSD doesn't do AT_HWCAP{,2} on x86 */
+
+#define ELF_CLASS       ELFCLASS32
+#define ELF_DATA        ELFDATA2LSB
+#define ELF_ARCH        EM_386
+
+#define USE_ELF_CORE_DUMP
+#define ELF_EXEC_PAGESIZE       4096
+
+#endif /* _TARGET_ARCH_ELF_H_ */
diff --git a/bsd-user/i386/target_arch_reg.h b/bsd-user/i386/target_arch_reg.h
new file mode 100644
index 000000000..1fce1daf0
--- /dev/null
+++ b/bsd-user/i386/target_arch_reg.h
@@ -0,0 +1,82 @@
+/*
+ *  FreeBSD i386 register structures
+ *
+ *  Copyright (c) 2015 Stacey Son
+ *  All rights reserved.
+ *
+ *  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/>.
+ */
+
+#ifndef _TARGET_ARCH_REG_H_
+#define _TARGET_ARCH_REG_H_
+
+/* See sys/i386/include/reg.h */
+typedef struct target_reg {
+    uint32_t        r_fs;
+    uint32_t        r_es;
+    uint32_t        r_ds;
+    uint32_t        r_edi;
+    uint32_t        r_esi;
+    uint32_t        r_ebp;
+    uint32_t        r_isp;
+    uint32_t        r_ebx;
+    uint32_t        r_edx;
+    uint32_t        r_ecx;
+    uint32_t        r_eax;
+    uint32_t        r_trapno;
+    uint32_t        r_err;
+    uint32_t        r_eip;
+    uint32_t        r_cs;
+    uint32_t        r_eflags;
+    uint32_t        r_esp;
+    uint32_t        r_ss;
+    uint32_t        r_gs;
+} target_reg_t;
+
+typedef struct target_fpreg {
+    uint32_t        fpr_env[7];
+    uint8_t         fpr_acc[8][10];
+    uint32_t        fpr_ex_sw;
+    uint8_t         fpr_pad[64];
+} target_fpreg_t;
+
+static inline void target_copy_regs(target_reg_t *regs, const CPUX86State *env)
+{
+
+    regs->r_fs = env->segs[R_FS].selector & 0xffff;
+    regs->r_es = env->segs[R_ES].selector & 0xffff;
+    regs->r_ds = env->segs[R_DS].selector & 0xffff;
+
+    regs->r_edi = env->regs[R_EDI];
+    regs->r_esi = env->regs[R_ESI];
+    regs->r_ebp = env->regs[R_EBP];
+    /* regs->r_isp = env->regs[R_ISP]; XXX */
+    regs->r_ebx = env->regs[R_EBX];
+    regs->r_edx = env->regs[R_EDX];
+    regs->r_ecx = env->regs[R_ECX];
+    regs->r_eax = env->regs[R_EAX];
+    /* regs->r_trapno = env->regs[R_TRAPNO]; XXX */
+    regs->r_err = env->error_code;  /* XXX ? */
+    regs->r_eip = env->eip;
+
+    regs->r_cs = env->segs[R_CS].selector & 0xffff;
+
+    regs->r_eflags = env->eflags;
+    regs->r_esp = env->regs[R_ESP];
+
+    regs->r_ss = env->segs[R_SS].selector & 0xffff;
+    regs->r_gs = env->segs[R_GS].selector & 0xffff;
+}
+
+#endif /* !_TARGET_ARCH_REG_H_ */
diff --git a/bsd-user/i386/target_arch_signal.h b/bsd-user/i386/target_arch_signal.h
new file mode 100644
index 000000000..a90750d60
--- /dev/null
+++ b/bsd-user/i386/target_arch_signal.h
@@ -0,0 +1,92 @@
+/*
+ *  i386 dependent signal definitions
+ *
+ *
+ *  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/>.
+ */
+#ifndef TARGET_ARCH_SIGNAL_H
+#define TARGET_ARCH_SIGNAL_H
+
+#include "cpu.h"
+
+/* Size of the signal trampolin code placed on the stack. */
+#define TARGET_SZSIGCODE    0
+
+/* compare to  x86/include/_limits.h */
+#define TARGET_MINSIGSTKSZ  (512 * 4)               /* min sig stack size */
+#define TARGET_SIGSTKSZ     (MINSIGSTKSZ + 32768)   /* recommended size */
+
+struct target_sigcontext {
+    /* to be added */
+};
+
+typedef struct target_mcontext {
+} target_mcontext_t;
+
+typedef struct target_ucontext {
+    target_sigset_t   uc_sigmask;
+    target_mcontext_t uc_mcontext;
+    abi_ulong         uc_link;
+    target_stack_t    uc_stack;
+    int32_t           uc_flags;
+    int32_t         __spare__[4];
+} target_ucontext_t;
+
+struct target_sigframe {
+    abi_ulong   sf_signum;
+    abi_ulong   sf_siginfo;    /* code or pointer to sf_si */
+    abi_ulong   sf_ucontext;   /* points to sf_uc */
+    abi_ulong   sf_addr;       /* undocumented 4th arg */
+    target_ucontext_t   sf_uc; /* = *sf_uncontext */
+    target_siginfo_t    sf_si; /* = *sf_siginfo (SA_SIGINFO case)*/
+    uint32_t    __spare__[2];
+};
+
+/*
+ * Compare to i386/i386/machdep.c sendsig()
+ * Assumes that target stack frame memory is locked.
+ */
+static inline abi_long set_sigtramp_args(CPUX86State *regs,
+        int sig, struct target_sigframe *frame, abi_ulong frame_addr,
+        struct target_sigaction *ka)
+{
+    /* XXX return -TARGET_EOPNOTSUPP; */
+    return 0;
+}
+
+/* Compare to i386/i386/machdep.c get_mcontext() */
+static inline abi_long get_mcontext(CPUX86State *regs,
+        target_mcontext_t *mcp, int flags)
+{
+    /* XXX */
+    return -TARGET_EOPNOTSUPP;
+}
+
+/* Compare to i386/i386/machdep.c set_mcontext() */
+static inline abi_long set_mcontext(CPUX86State *regs,
+        target_mcontext_t *mcp, int srflag)
+{
+    /* XXX */
+    return -TARGET_EOPNOTSUPP;
+}
+
+static inline abi_long get_ucontext_sigreturn(CPUX86State *regs,
+                        abi_ulong target_sf, abi_ulong *target_uc)
+{
+    /* XXX */
+    *target_uc = 0;
+    return -TARGET_EOPNOTSUPP;
+}
+
+#endif /* TARGET_ARCH_SIGNAL_H */
diff --git a/bsd-user/i386/target_arch_sigtramp.h b/bsd-user/i386/target_arch_sigtramp.h
new file mode 100644
index 000000000..cb4e89b0b
--- /dev/null
+++ b/bsd-user/i386/target_arch_sigtramp.h
@@ -0,0 +1,29 @@
+/*
+ * Intel i386  sigcode for bsd-user
+ *
+ *  Copyright (c) 2013 Stacey D. Son
+ *
+ *  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/>.
+ */
+
+#ifndef _TARGET_ARCH_SIGTRAMP_H_
+#define _TARGET_ARCH_SIGTRAMP_H_
+
+static inline abi_long setup_sigtramp(abi_ulong offset, unsigned sigf_uc,
+        unsigned sys_sigreturn)
+{
+
+    return 0;
+}
+#endif /* _TARGET_ARCH_SIGTRAMP_H_ */
diff --git a/bsd-user/i386/target_arch_sysarch.h b/bsd-user/i386/target_arch_sysarch.h
new file mode 100644
index 000000000..e9ab98ec3
--- /dev/null
+++ b/bsd-user/i386/target_arch_sysarch.h
@@ -0,0 +1,77 @@
+/*
+ *  i386 sysarch system call emulation
+ *
+ *  Copyright (c) 2013 Stacey D. Son
+ *
+ *  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/>.
+ */
+
+#ifndef BSD_USER_ARCH_SYSARCH_H_
+#define BSD_USER_ARCH_SYSARCH_H_
+
+#include "target_syscall.h"
+
+static inline abi_long do_freebsd_arch_sysarch(CPUX86State *env, int op,
+        abi_ulong parms)
+{
+    abi_long ret = 0;
+    abi_ulong val;
+    int idx;
+
+    switch (op) {
+    case TARGET_FREEBSD_I386_SET_GSBASE:
+    case TARGET_FREEBSD_I386_SET_FSBASE:
+        if (op == TARGET_FREEBSD_I386_SET_GSBASE) {
+            idx = R_GS;
+        } else {
+            idx = R_FS;
+        }
+        if (get_user(val, parms, abi_ulong)) {
+            return -TARGET_EFAULT;
+        }
+        cpu_x86_load_seg(env, idx, 0);
+        env->segs[idx].base = val;
+        break;
+
+    case TARGET_FREEBSD_I386_GET_GSBASE:
+    case TARGET_FREEBSD_I386_GET_FSBASE:
+        if (op == TARGET_FREEBSD_I386_GET_GSBASE) {
+            idx = R_GS;
+        } else {
+            idx = R_FS;
+        }
+        val = env->segs[idx].base;
+        if (put_user(val, parms, abi_ulong)) {
+            return -TARGET_EFAULT;
+        }
+        break;
+
+    /* XXX handle the others... */
+    default:
+        ret = -TARGET_EINVAL;
+        break;
+    }
+    return ret;
+}
+
+static inline void do_freebsd_arch_print_sysarch(
+        const struct syscallname *name, abi_long arg1, abi_long arg2,
+        abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
+{
+
+    gemu_log("%s(%d, " TARGET_ABI_FMT_lx ", " TARGET_ABI_FMT_lx ", "
+        TARGET_ABI_FMT_lx ")", name->name, (int)arg1, arg2, arg3, arg4);
+}
+
+#endif /* !BSD_USER_ARCH_SYSARCH_H_ */
diff --git a/bsd-user/i386/target_arch_thread.h b/bsd-user/i386/target_arch_thread.h
new file mode 100644
index 000000000..e65e476f7
--- /dev/null
+++ b/bsd-user/i386/target_arch_thread.h
@@ -0,0 +1,47 @@
+/*
+ *  i386 thread support
+ *
+ *  Copyright (c) 2013 Stacey D. Son
+ *
+ *  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/>.
+ */
+#ifndef _TARGET_ARCH_THREAD_H_
+#define _TARGET_ARCH_THREAD_H_
+
+/* Compare to vm_machdep.c cpu_set_upcall_kse() */
+static inline void target_thread_set_upcall(CPUX86State *regs, abi_ulong entry,
+    abi_ulong arg, abi_ulong stack_base, abi_ulong stack_size)
+{
+    /* XXX */
+}
+
+static inline void target_thread_init(struct target_pt_regs *regs,
+        struct image_info *infop)
+{
+    regs->esp = infop->start_stack;
+    regs->eip = infop->entry;
+
+    /*
+     * SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
+     * contains a pointer to a function which might be registered using
+     * `atexit'.  This provides a mean for the dynamic linker to call DT_FINI
+     * functions for shared libraries that have been loaded before the code
+     * runs.
+     *
+     * A value of 0 tells we have no such handler.
+     */
+    regs->edx = 0;
+}
+
+#endif /* !_TARGET_ARCH_THREAD_H_ */
diff --git a/bsd-user/i386/target_arch_vmparam.h b/bsd-user/i386/target_arch_vmparam.h
new file mode 100644
index 000000000..bb7718265
--- /dev/null
+++ b/bsd-user/i386/target_arch_vmparam.h
@@ -0,0 +1,46 @@
+/*
+ *  i386 VM parameters definitions
+ *
+ *  Copyright (c) 2013 Stacey D. Son
+ *
+ *  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/>.
+ */
+#ifndef _TARGET_ARCH_VMPARAM_H_
+#define _TARGET_ARCH_VMPARAM_H_
+
+#include "cpu.h"
+
+/* compare to i386/include/vmparam.h */
+#define TARGET_MAXTSIZ  (128 * MiB)             /* max text size */
+#define TARGET_DFLDSIZ  (128 * MiB)             /* initial data size limit */
+#define TARGET_MAXDSIZ  (512 * MiB)             /* max data size */
+#define TARGET_DFLSSIZ  (8 * MiB)               /* initial stack size limit */
+#define TARGET_MAXSSIZ  (64 * MiB)              /* max stack size */
+#define TARGET_SGROWSIZ (128 * KiB)             /* amount to grow stack */
+
+#define TARGET_RESERVED_VA 0xf7000000
+
+#define TARGET_USRSTACK (0xbfc00000)
+
+static inline abi_ulong get_sp_from_cpustate(CPUX86State *state)
+{
+    return state->regs[R_ESP];
+}
+
+static inline void set_second_rval(CPUX86State *state, abi_ulong retval2)
+{
+    state->regs[R_EDX] = retval2;
+}
+
+#endif /* !_TARGET_ARCH_VMPARAM_H_ */
diff --git a/bsd-user/i386/target_syscall.h b/bsd-user/i386/target_syscall.h
new file mode 100644
index 000000000..940c687a5
--- /dev/null
+++ b/bsd-user/i386/target_syscall.h
@@ -0,0 +1,184 @@
+/*
+ *  i386 system call definitions
+ *
+ *
+ *  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/>.
+ */
+#ifndef TARGET_SYSCALL_H
+#define TARGET_SYSCALL_H
+
+/* default linux values for the selectors */
+#define __USER_CS	(0x23)
+#define __USER_DS	(0x2B)
+
+struct target_pt_regs {
+	long ebx;
+	long ecx;
+	long edx;
+	long esi;
+	long edi;
+	long ebp;
+	long eax;
+	int  xds;
+	int  xes;
+	long orig_eax;
+	long eip;
+	int  xcs;
+	long eflags;
+	long esp;
+	int  xss;
+};
+
+/* ioctls */
+
+#define TARGET_LDT_ENTRIES      8192
+#define TARGET_LDT_ENTRY_SIZE	8
+
+#define TARGET_GDT_ENTRIES             9
+#define TARGET_GDT_ENTRY_TLS_ENTRIES   3
+#define TARGET_GDT_ENTRY_TLS_MIN       6
+#define TARGET_GDT_ENTRY_TLS_MAX       (TARGET_GDT_ENTRY_TLS_MIN + TARGET_GDT_ENTRY_TLS_ENTRIES - 1)
+
+struct target_modify_ldt_ldt_s {
+    unsigned int  entry_number;
+    abi_ulong base_addr;
+    unsigned int limit;
+    unsigned int flags;
+};
+
+/* vm86 defines */
+
+#define TARGET_BIOSSEG		0x0f000
+
+#define TARGET_CPU_086		0
+#define TARGET_CPU_186		1
+#define TARGET_CPU_286		2
+#define TARGET_CPU_386		3
+#define TARGET_CPU_486		4
+#define TARGET_CPU_586		5
+
+#define TARGET_VM86_SIGNAL	0	/* return due to signal */
+#define TARGET_VM86_UNKNOWN	1	/* unhandled GP fault - IO-instruction or similar */
+#define TARGET_VM86_INTx	2	/* int3/int x instruction (ARG = x) */
+#define TARGET_VM86_STI	3	/* sti/popf/iret instruction enabled virtual interrupts */
+
+/*
+ * Additional return values when invoking new vm86()
+ */
+#define TARGET_VM86_PICRETURN	4	/* return due to pending PIC request */
+#define TARGET_VM86_TRAP	6	/* return due to DOS-debugger request */
+
+/*
+ * function codes when invoking new vm86()
+ */
+#define TARGET_VM86_PLUS_INSTALL_CHECK	0
+#define TARGET_VM86_ENTER		1
+#define TARGET_VM86_ENTER_NO_BYPASS	2
+#define	TARGET_VM86_REQUEST_IRQ	3
+#define TARGET_VM86_FREE_IRQ		4
+#define TARGET_VM86_GET_IRQ_BITS	5
+#define TARGET_VM86_GET_AND_RESET_IRQ	6
+
+/*
+ * This is the stack-layout seen by the user space program when we have
+ * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout
+ * is 'kernel_vm86_regs' (see below).
+ */
+
+struct target_vm86_regs {
+/*
+ * normal regs, with special meaning for the segment descriptors..
+ */
+	abi_long ebx;
+	abi_long ecx;
+	abi_long edx;
+	abi_long esi;
+	abi_long edi;
+	abi_long ebp;
+	abi_long eax;
+	abi_long __null_ds;
+	abi_long __null_es;
+	abi_long __null_fs;
+	abi_long __null_gs;
+	abi_long orig_eax;
+	abi_long eip;
+	unsigned short cs, __csh;
+	abi_long eflags;
+	abi_long esp;
+	unsigned short ss, __ssh;
+/*
+ * these are specific to v86 mode:
+ */
+	unsigned short es, __esh;
+	unsigned short ds, __dsh;
+	unsigned short fs, __fsh;
+	unsigned short gs, __gsh;
+};
+
+struct target_revectored_struct {
+	abi_ulong __map[8];			/* 256 bits */
+};
+
+struct target_vm86_struct {
+	struct target_vm86_regs regs;
+	abi_ulong flags;
+	abi_ulong screen_bitmap;
+	abi_ulong cpu_type;
+	struct target_revectored_struct int_revectored;
+	struct target_revectored_struct int21_revectored;
+};
+
+/*
+ * flags masks
+ */
+#define TARGET_VM86_SCREEN_BITMAP	0x0001
+
+struct target_vm86plus_info_struct {
+        abi_ulong flags;
+#define TARGET_force_return_for_pic (1 << 0)
+#define TARGET_vm86dbg_active       (1 << 1)  /* for debugger */
+#define TARGET_vm86dbg_TFpendig     (1 << 2)  /* for debugger */
+#define TARGET_is_vm86pus           (1 << 31) /* for vm86 internal use */
+	unsigned char vm86dbg_intxxtab[32];   /* for debugger */
+};
+
+struct target_vm86plus_struct {
+	struct target_vm86_regs regs;
+	abi_ulong flags;
+	abi_ulong screen_bitmap;
+	abi_ulong cpu_type;
+	struct target_revectored_struct int_revectored;
+	struct target_revectored_struct int21_revectored;
+	struct target_vm86plus_info_struct vm86plus;
+};
+
+/* FreeBSD sysarch(2) */
+#define TARGET_FREEBSD_I386_GET_LDT	0
+#define TARGET_FREEBSD_I386_SET_LDT	1
+				/* I386_IOPL */
+#define TARGET_FREEBSD_I386_GET_IOPERM	3
+#define TARGET_FREEBSD_I386_SET_IOPERM	4
+				/* xxxxx */
+#define TARGET_FREEBSD_I386_VM86	6
+#define TARGET_FREEBSD_I386_GET_FSBASE	7
+#define TARGET_FREEBSD_I386_SET_FSBASE	8
+#define TARGET_FREEBSD_I386_GET_GSBASE	9
+#define TARGET_FREEBSD_I386_SET_GSBASE	10
+
+
+#define UNAME_MACHINE "i386"
+#define TARGET_HW_MACHINE UNAME_MACHINE
+#define TARGET_HW_MACHINE_ARCH UNAME_MACHINE
+
+#endif /* TARGET_SYSCALL_H */