microblaze: linux-user support.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

5 files changed, 405 insertions, 4 deletions

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 508cb379b0..190ad143e0 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -453,6 +453,28 @@ static inline void init_thread(struct target_pt_regs *regs, struct image_info *i
 
 #endif /* TARGET_MIPS */
 
+#ifdef TARGET_MICROBLAZE
+
+#define ELF_START_MMAP 0x80000000
+
+#define elf_check_arch(x) ( (x) == EM_XILINX_MICROBLAZE )
+
+#define ELF_CLASS   ELFCLASS32
+#define ELF_DATA	ELFDATA2MSB
+#define ELF_ARCH    EM_MIPS
+
+static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
+{
+    regs->pc = infop->entry;
+    regs->r1 = infop->start_stack;
+
+}
+
+#define USE_ELF_CORE_DUMP
+#define ELF_EXEC_PAGESIZE        4096
+
+#endif /* TARGET_MICROBLAZE */
+
 #ifdef TARGET_SH4
 
 #define ELF_START_MMAP 0x80000000
diff --git a/linux-user/main.c b/linux-user/main.c
index 17cdfa6d99..4832d3f860 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -2036,6 +2036,66 @@ void cpu_loop (CPUState *env)
 }
 #endif
 
+#ifdef TARGET_MICROBLAZE
+void cpu_loop (CPUState *env)
+{
+    int trapnr, ret;
+    target_siginfo_t info;
+    
+    while (1) {
+        trapnr = cpu_mb_exec (env);
+        switch (trapnr) {
+        case 0xaa:
+            {
+                info.si_signo = SIGSEGV;
+                info.si_errno = 0;
+                /* XXX: check env->error_code */
+                info.si_code = TARGET_SEGV_MAPERR;
+                info._sifields._sigfault._addr = 0;
+                queue_signal(env, info.si_signo, &info);
+            }
+            break;
+	case EXCP_INTERRUPT:
+	  /* just indicate that signals should be handled asap */
+	  break;
+        case EXCP_BREAK:
+            /* Return address is 4 bytes after the call.  */
+            env->regs[14] += 4;
+            ret = do_syscall(env, 
+                             env->regs[12], 
+                             env->regs[5], 
+                             env->regs[6], 
+                             env->regs[7], 
+                             env->regs[8], 
+                             env->regs[9], 
+                             env->regs[10]);
+            env->regs[3] = ret;
+            env->sregs[SR_PC] = env->regs[14];
+            break;
+        case EXCP_DEBUG:
+            {
+                int sig;
+
+                sig = gdb_handlesig (env, TARGET_SIGTRAP);
+                if (sig)
+                  {
+                    info.si_signo = sig;
+                    info.si_errno = 0;
+                    info.si_code = TARGET_TRAP_BRKPT;
+                    queue_signal(env, info.si_signo, &info);
+                  }
+            }
+            break;
+        default:
+            printf ("Unhandled trap: 0x%x\n", trapnr);
+            cpu_dump_state(env, stderr, fprintf, 0);
+            exit (1);
+        }
+        process_pending_signals (env);
+    }
+}
+#endif
+
 #ifdef TARGET_M68K
 
 void cpu_loop(CPUM68KState *env)
@@ -2698,6 +2758,42 @@ int main(int argc, char **argv, char **envp)
         env->sr = regs->sr;
         ts->sim_syscalls = 1;
     }
+#elif defined(TARGET_MICROBLAZE)
+    {
+        env->regs[0] = regs->r0;
+        env->regs[1] = regs->r1;
+        env->regs[2] = regs->r2;
+        env->regs[3] = regs->r3;
+        env->regs[4] = regs->r4;
+        env->regs[5] = regs->r5;
+        env->regs[6] = regs->r6;
+        env->regs[7] = regs->r7;
+        env->regs[8] = regs->r8;
+        env->regs[9] = regs->r9;
+        env->regs[10] = regs->r10;
+        env->regs[11] = regs->r11;
+        env->regs[12] = regs->r12;
+        env->regs[13] = regs->r13;
+        env->regs[14] = regs->r14;
+        env->regs[15] = regs->r15;	    
+        env->regs[16] = regs->r16;	    
+        env->regs[17] = regs->r17;	    
+        env->regs[18] = regs->r18;	    
+        env->regs[19] = regs->r19;	    
+        env->regs[20] = regs->r20;	    
+        env->regs[21] = regs->r21;	    
+        env->regs[22] = regs->r22;	    
+        env->regs[23] = regs->r23;	    
+        env->regs[24] = regs->r24;	    
+        env->regs[25] = regs->r25;	    
+        env->regs[26] = regs->r26;	    
+        env->regs[27] = regs->r27;	    
+        env->regs[28] = regs->r28;	    
+        env->regs[29] = regs->r29;	    
+        env->regs[30] = regs->r30;	    
+        env->regs[31] = regs->r31;	    
+        env->sregs[SR_PC] = regs->pc;
+    }
 #elif defined(TARGET_MIPS)
     {
         int i;
diff --git a/linux-user/signal.c b/linux-user/signal.c
index 9c9c7eb63d..371927e2a2 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -3011,6 +3011,222 @@ badframe:
     force_sig(TARGET_SIGSEGV);
     return 0;
 }
+#elif defined(TARGET_MICROBLAZE)
+
+struct target_sigcontext {
+    struct target_pt_regs regs;  /* needs to be first */
+    uint32_t oldmask;
+};
+
+/* Signal frames. */
+struct target_signal_frame {
+    struct target_sigcontext sc;
+    uint32_t extramask[TARGET_NSIG_WORDS - 1];
+    uint32_t tramp[2];
+};
+
+struct rt_signal_frame {
+    struct siginfo info;
+    struct ucontext uc;
+    uint32_t tramp[2];
+};
+
+static void setup_sigcontext(struct target_sigcontext *sc, CPUState *env)
+{
+    __put_user(env->regs[0], &sc->regs.r0);
+    __put_user(env->regs[1], &sc->regs.r1);
+    __put_user(env->regs[2], &sc->regs.r2);
+    __put_user(env->regs[3], &sc->regs.r3);
+    __put_user(env->regs[4], &sc->regs.r4);
+    __put_user(env->regs[5], &sc->regs.r5);
+    __put_user(env->regs[6], &sc->regs.r6);
+    __put_user(env->regs[7], &sc->regs.r7);
+    __put_user(env->regs[8], &sc->regs.r8);
+    __put_user(env->regs[9], &sc->regs.r9);
+    __put_user(env->regs[10], &sc->regs.r10);
+    __put_user(env->regs[11], &sc->regs.r11);
+    __put_user(env->regs[12], &sc->regs.r12);
+    __put_user(env->regs[13], &sc->regs.r13);
+    __put_user(env->regs[14], &sc->regs.r14);
+    __put_user(env->regs[15], &sc->regs.r15);
+    __put_user(env->regs[16], &sc->regs.r16);
+    __put_user(env->regs[17], &sc->regs.r17);
+    __put_user(env->regs[18], &sc->regs.r18);
+    __put_user(env->regs[19], &sc->regs.r19);
+    __put_user(env->regs[20], &sc->regs.r20);
+    __put_user(env->regs[21], &sc->regs.r21);
+    __put_user(env->regs[22], &sc->regs.r22);
+    __put_user(env->regs[23], &sc->regs.r23);
+    __put_user(env->regs[24], &sc->regs.r24);
+    __put_user(env->regs[25], &sc->regs.r25);
+    __put_user(env->regs[26], &sc->regs.r26);
+    __put_user(env->regs[27], &sc->regs.r27);
+    __put_user(env->regs[28], &sc->regs.r28);
+    __put_user(env->regs[29], &sc->regs.r29);
+    __put_user(env->regs[30], &sc->regs.r30);
+    __put_user(env->regs[31], &sc->regs.r31);
+    __put_user(env->sregs[SR_PC], &sc->regs.pc);
+}
+
+static void restore_sigcontext(struct target_sigcontext *sc, CPUState *env)
+{
+    __get_user(env->regs[0], &sc->regs.r0);
+    __get_user(env->regs[1], &sc->regs.r1);
+    __get_user(env->regs[2], &sc->regs.r2);
+    __get_user(env->regs[3], &sc->regs.r3);
+    __get_user(env->regs[4], &sc->regs.r4);
+    __get_user(env->regs[5], &sc->regs.r5);
+    __get_user(env->regs[6], &sc->regs.r6);
+    __get_user(env->regs[7], &sc->regs.r7);
+    __get_user(env->regs[8], &sc->regs.r8);
+    __get_user(env->regs[9], &sc->regs.r9);
+    __get_user(env->regs[10], &sc->regs.r10);
+    __get_user(env->regs[11], &sc->regs.r11);
+    __get_user(env->regs[12], &sc->regs.r12);
+    __get_user(env->regs[13], &sc->regs.r13);
+    __get_user(env->regs[14], &sc->regs.r14);
+    __get_user(env->regs[15], &sc->regs.r15);
+    __get_user(env->regs[16], &sc->regs.r16);
+    __get_user(env->regs[17], &sc->regs.r17);
+    __get_user(env->regs[18], &sc->regs.r18);
+    __get_user(env->regs[19], &sc->regs.r19);
+    __get_user(env->regs[20], &sc->regs.r20);
+    __get_user(env->regs[21], &sc->regs.r21);
+    __get_user(env->regs[22], &sc->regs.r22);
+    __get_user(env->regs[23], &sc->regs.r23);
+    __get_user(env->regs[24], &sc->regs.r24);
+    __get_user(env->regs[25], &sc->regs.r25);
+    __get_user(env->regs[26], &sc->regs.r26);
+    __get_user(env->regs[27], &sc->regs.r27);
+    __get_user(env->regs[28], &sc->regs.r28);
+    __get_user(env->regs[29], &sc->regs.r29);
+    __get_user(env->regs[30], &sc->regs.r30);
+    __get_user(env->regs[31], &sc->regs.r31);
+    __get_user(env->sregs[SR_PC], &sc->regs.pc);
+}
+
+static abi_ulong get_sigframe(struct target_sigaction *ka,
+                              CPUState *env, int frame_size)
+{
+    abi_ulong sp = env->regs[1];
+
+    if ((ka->sa_flags & SA_ONSTACK) != 0 && !on_sig_stack(sp))
+        sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
+
+    return ((sp - frame_size) & -8UL);
+}
+
+static void setup_frame(int sig, struct target_sigaction *ka,
+			target_sigset_t *set, CPUState *env)
+{
+    struct target_signal_frame *frame;
+    abi_ulong frame_addr;
+    int err = 0;
+    int i;
+
+    frame_addr = get_sigframe(ka, env, sizeof *frame);
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
+        goto badframe;
+
+    /* Save the mask.  */
+    err |= __put_user(set->sig[0], &frame->sc.oldmask);
+    if (err)
+        goto badframe;
+
+    for(i = 1; i < TARGET_NSIG_WORDS; i++) {
+        if (__put_user(set->sig[i], &frame->extramask[i - 1]))
+            goto badframe;
+    }
+
+    setup_sigcontext(&frame->sc, env);
+
+    /* Set up to return from userspace. If provided, use a stub
+       already in userspace. */
+    /* minus 8 is offset to cater for "rtsd r15,8" offset */
+    if (ka->sa_flags & TARGET_SA_RESTORER) {
+        env->regs[15] = ((unsigned long)ka->sa_restorer)-8;
+    } else {
+        uint32_t t;
+        /* Note, these encodings are _big endian_! */
+        /* addi r12, r0, __NR_sigreturn */
+        t = 0x31800000UL | TARGET_NR_sigreturn;
+        err |= __put_user(t, frame->tramp + 0);
+        /* brki r14, 0x8 */
+        t = 0xb9cc0008UL;
+        err |= __put_user(t, frame->tramp + 1);
+
+        /* Return from sighandler will jump to the tramp.
+           Negative 8 offset because return is rtsd r15, 8 */
+        env->regs[15] = ((unsigned long)frame->tramp) - 8;
+    }
+
+    if (err)
+        goto badframe;
+
+    /* Set up registers for signal handler */
+    env->regs[1] = (unsigned long) frame;
+    /* Signal handler args: */
+    env->regs[5] = sig; /* Arg 0: signum */
+    env->regs[6] = (unsigned long) &frame->sc; /* arg 1: sigcontext */
+
+    /* Offset of 4 to handle microblaze rtid r14, 0 */
+    env->sregs[SR_PC] = (unsigned long)ka->_sa_handler;
+
+    unlock_user_struct(frame, frame_addr, 1);
+    return;
+  badframe:
+    unlock_user_struct(frame, frame_addr, 1);
+    force_sig(TARGET_SIGSEGV);
+}
+
+static void setup_rt_frame(int sig, struct target_sigaction *ka,
+                           target_siginfo_t *info,
+			   target_sigset_t *set, CPUState *env)
+{
+    fprintf(stderr, "Microblaze setup_rt_frame: not implemented\n");
+}
+
+long do_sigreturn(CPUState *env)
+{
+    struct target_signal_frame *frame;
+    abi_ulong frame_addr;
+    target_sigset_t target_set;
+    sigset_t set;
+    int i;
+
+    frame_addr = env->regs[R_SP];
+    /* Make sure the guest isn't playing games.  */
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1))
+        goto badframe;
+
+    /* Restore blocked signals */
+    if (__get_user(target_set.sig[0], &frame->sc.oldmask))
+        goto badframe;
+    for(i = 1; i < TARGET_NSIG_WORDS; i++) {
+        if (__get_user(target_set.sig[i], &frame->extramask[i - 1]))
+            goto badframe;
+    }
+    target_to_host_sigset_internal(&set, &target_set);
+    sigprocmask(SIG_SETMASK, &set, NULL);
+
+    restore_sigcontext(&frame->sc, env);
+    /* We got here through a sigreturn syscall, our path back is via an
+       rtb insn so setup r14 for that.  */
+    env->regs[14] = env->sregs[SR_PC];
+ 
+    unlock_user_struct(frame, frame_addr, 0);
+    return env->regs[10];
+  badframe:
+    unlock_user_struct(frame, frame_addr, 0);
+    force_sig(TARGET_SIGSEGV);
+}
+
+long do_rt_sigreturn(CPUState *env)
+{
+    fprintf(stderr, "Microblaze do_rt_sigreturn: not implemented\n");
+    return -TARGET_ENOSYS;
+}
+
 #elif defined(TARGET_CRIS)
 
 struct target_sigcontext {
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index b58220d9a8..a0915a455b 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4854,7 +4854,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #endif
 #ifdef TARGET_NR_mmap
     case TARGET_NR_mmap:
-#if (defined(TARGET_I386) && defined(TARGET_ABI32)) || defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_CRIS)
+#if (defined(TARGET_I386) && defined(TARGET_ABI32)) || defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_CRIS) || defined(TARGET_MICROBLAZE)
         {
             abi_ulong *v;
             abi_ulong v1, v2, v3, v4, v5, v6;
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 7f0b0dff14..e2ba0bbc10 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -59,7 +59,8 @@
 #define TARGET_IOC_READ	  2U
 
 #elif defined(TARGET_PPC) || defined(TARGET_ALPHA) || \
-      defined(TARGET_SPARC) || defined(TARGET_MIPS)
+      defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE) || \
+      defined(TARGET_MIPS)
 
 #define TARGET_IOC_SIZEBITS	13
 #define TARGET_IOC_DIRBITS	3
@@ -286,7 +287,7 @@ struct target_sigaction;
 int do_sigaction(int sig, const struct target_sigaction *act,
                  struct target_sigaction *oact);
 
-#if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SPARC) || defined(TARGET_PPC) || defined(TARGET_MIPS) || defined (TARGET_SH4) || defined(TARGET_M68K) || defined(TARGET_ALPHA) || defined(TARGET_CRIS)
+#if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SPARC) || defined(TARGET_PPC) || defined(TARGET_MIPS) || defined (TARGET_SH4) || defined(TARGET_M68K) || defined(TARGET_ALPHA) || defined(TARGET_CRIS) || defined(TARGET_MICROBLAZE)
 
 #if defined(TARGET_SPARC)
 #define TARGET_SA_NOCLDSTOP    8u
@@ -1170,6 +1171,54 @@ struct __attribute__((__packed__)) target_stat64 {
         unsigned int   __unused5;
 };
 
+#elif defined(TARGET_MICROBLAZE)
+
+struct target_stat {
+	abi_ulong st_dev;
+	abi_ulong st_ino;
+	unsigned int st_mode;
+	unsigned short st_nlink;
+	unsigned int st_uid;
+	unsigned int st_gid;
+	abi_ulong  st_rdev;
+	abi_ulong  st_size;
+	abi_ulong  st_blksize;
+	abi_ulong  st_blocks;
+	abi_ulong  target_st_atime;
+	abi_ulong  target_st_atime_nsec;
+	abi_ulong  target_st_mtime;
+	abi_ulong  target_st_mtime_nsec;
+	abi_ulong  target_st_ctime;
+	abi_ulong  target_st_ctime_nsec;
+	abi_ulong  __unused4;
+	abi_ulong  __unused5;
+};
+
+/* FIXME: Microblaze no-mmu user-space has a difference stat64 layout...  */
+struct __attribute__((__packed__)) target_stat64 {
+	uint64_t st_dev;
+        uint64_t st_ino;
+	uint32_t st_mode;
+	uint32_t st_nlink;
+	uint32_t st_uid;
+	uint32_t st_gid;
+	uint64_t st_rdev;
+	uint32_t __pad2;
+
+	int64_t  st_size;
+	int32_t st_blksize;
+	int64_t st_blocks;	/* Number 512-byte blocks allocated. */
+
+	int	       target_st_atime;
+        unsigned int   target_st_atime_nsec;
+	int	       target_st_mtime;
+        unsigned int   target_st_mtime_nsec;
+	int            target_st_ctime;
+        unsigned int   target_st_ctime_nsec;
+        uint32_t   __unused4;
+        uint32_t   __unused5;
+};
+
 #elif defined(TARGET_M68K)
 
 struct target_stat {
@@ -1719,6 +1768,24 @@ struct target_statfs64 {
 #define TARGET_O_NOFOLLOW      0100000 /* don't follow links */
 #define TARGET_O_LARGEFILE     0200000
 #define TARGET_O_DIRECT        0400000 /* direct disk access hint */
+#elif defined (TARGET_MICROBLAZE)
+#define TARGET_O_ACCMODE          0003
+#define TARGET_O_RDONLY             00
+#define TARGET_O_WRONLY             01
+#define TARGET_O_RDWR               02
+#define TARGET_O_CREAT            0100 /* not fcntl */
+#define TARGET_O_EXCL             0200 /* not fcntl */
+#define TARGET_O_NOCTTY           0400 /* not fcntl */
+#define TARGET_O_TRUNC           01000 /* not fcntl */
+#define TARGET_O_APPEND          02000
+#define TARGET_O_NONBLOCK        04000
+#define TARGET_O_NDELAY        TARGET_O_NONBLOCK
+#define TARGET_O_SYNC           010000
+#define TARGET_FASYNC           020000 /* fcntl, for BSD compatibility */
+#define TARGET_O_DIRECTORY      040000 /* must be a directory */
+#define TARGET_O_NOFOLLOW      0100000 /* don't follow links */
+#define TARGET_O_LARGEFILE     0200000
+#define TARGET_O_DIRECT        0400000 /* direct disk access hint */
 #elif defined (TARGET_SPARC)
 #define TARGET_O_RDONLY        0x0000
 #define TARGET_O_WRONLY        0x0001
@@ -1806,7 +1873,7 @@ struct target_flock {
 struct target_flock64 {
 	short  l_type;
 	short  l_whence;
-#if defined(TARGET_PPC) || defined(TARGET_X86_64) || defined(TARGET_MIPS) || defined(TARGET_SPARC) || defined(TARGET_HPPA)
+#if defined(TARGET_PPC) || defined(TARGET_X86_64) || defined(TARGET_MIPS) || defined(TARGET_SPARC) || defined(TARGET_HPPA) || defined (TARGET_MICROBLAZE)
         int __pad;
 #endif
 	unsigned long long l_start;