auto import from //depot/cupcake/@135843

1 files changed, 469 insertions, 0 deletions

diff --git a/arm-semi.c b/arm-semi.c
new file mode 100644
index 0000000..cd77d1d
--- /dev/null
+++ b/arm-semi.c
@@ -0,0 +1,469 @@
+/*
+ *  Arm "Angel" semihosting syscalls
+ *
+ *  Copyright (c) 2005, 2007 CodeSourcery.
+ *  Written by Paul Brook.
+ *
+ *  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, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#include "cpu.h"
+#ifdef CONFIG_USER_ONLY
+#include "qemu.h"
+
+#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
+#else
+#include "qemu-common.h"
+#include "sysemu.h"
+#include "gdbstub.h"
+#endif
+
+#define SYS_OPEN        0x01
+#define SYS_CLOSE       0x02
+#define SYS_WRITEC      0x03
+#define SYS_WRITE0      0x04
+#define SYS_WRITE       0x05
+#define SYS_READ        0x06
+#define SYS_READC       0x07
+#define SYS_ISTTY       0x09
+#define SYS_SEEK        0x0a
+#define SYS_FLEN        0x0c
+#define SYS_TMPNAM      0x0d
+#define SYS_REMOVE      0x0e
+#define SYS_RENAME      0x0f
+#define SYS_CLOCK       0x10
+#define SYS_TIME        0x11
+#define SYS_SYSTEM      0x12
+#define SYS_ERRNO       0x13
+#define SYS_GET_CMDLINE 0x15
+#define SYS_HEAPINFO    0x16
+#define SYS_EXIT        0x18
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+#define GDB_O_RDONLY  0x000
+#define GDB_O_WRONLY  0x001
+#define GDB_O_RDWR    0x002
+#define GDB_O_APPEND  0x008
+#define GDB_O_CREAT   0x200
+#define GDB_O_TRUNC   0x400
+#define GDB_O_BINARY  0
+
+static int gdb_open_modeflags[12] = {
+    GDB_O_RDONLY,
+    GDB_O_RDONLY | GDB_O_BINARY,
+    GDB_O_RDWR,
+    GDB_O_RDWR | GDB_O_BINARY,
+    GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
+    GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
+    GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
+    GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
+    GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
+    GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY,
+    GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
+    GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY
+};
+
+static int open_modeflags[12] = {
+    O_RDONLY,
+    O_RDONLY | O_BINARY,
+    O_RDWR,
+    O_RDWR | O_BINARY,
+    O_WRONLY | O_CREAT | O_TRUNC,
+    O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
+    O_RDWR | O_CREAT | O_TRUNC,
+    O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
+    O_WRONLY | O_CREAT | O_APPEND,
+    O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
+    O_RDWR | O_CREAT | O_APPEND,
+    O_RDWR | O_CREAT | O_APPEND | O_BINARY
+};
+
+#ifdef CONFIG_USER_ONLY
+static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
+{
+    if (code == (uint32_t)-1)
+        ts->swi_errno = errno;
+    return code;
+}
+#else
+static inline uint32_t set_swi_errno(CPUState *env, uint32_t code)
+{
+    return code;
+}
+
+#include "softmmu-semi.h"
+#endif
+
+static target_ulong arm_semi_syscall_len;
+
+#if !defined(CONFIG_USER_ONLY)
+static target_ulong syscall_err;
+#endif
+
+static void arm_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
+{
+#ifdef CONFIG_USER_ONLY
+    TaskState *ts = env->opaque;
+#endif
+
+    if (ret == (target_ulong)-1) {
+#ifdef CONFIG_USER_ONLY
+        ts->swi_errno = err;
+#else
+	syscall_err = err;
+#endif
+        env->regs[0] = ret;
+    } else {
+        /* Fixup syscalls that use nonstardard return conventions.  */
+        switch (env->regs[0]) {
+        case SYS_WRITE:
+        case SYS_READ:
+            env->regs[0] = arm_semi_syscall_len - ret;
+            break;
+        case SYS_SEEK:
+            env->regs[0] = 0;
+            break;
+        default:
+            env->regs[0] = ret;
+            break;
+        }
+    }
+}
+
+static void arm_semi_flen_cb(CPUState *env, target_ulong ret, target_ulong err)
+{
+    /* The size is always stored in big-endian order, extract
+       the value. We assume the size always fit in 32 bits.  */
+    uint32_t size;
+    cpu_memory_rw_debug(env, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
+    env->regs[0] = be32_to_cpu(size);
+#ifdef CONFIG_USER_ONLY
+    ((TaskState *)env->opaque)->swi_errno = err;
+#else
+    syscall_err = err;
+#endif
+}
+
+#define ARG(n)					\
+({						\
+    target_ulong __arg;				\
+    /* FIXME - handle get_user() failure */	\
+    get_user_ual(__arg, args + (n) * 4);	\
+    __arg;					\
+})
+#define SET_ARG(n, val) put_user_ual(val, args + (n) * 4)
+uint32_t do_arm_semihosting(CPUState *env)
+{
+    target_ulong args;
+    char * s;
+    int nr;
+    uint32_t ret;
+    uint32_t len;
+#ifdef CONFIG_USER_ONLY
+    TaskState *ts = env->opaque;
+#else
+    CPUState *ts = env;
+#endif
+
+    nr = env->regs[0];
+    args = env->regs[1];
+    switch (nr) {
+    case SYS_OPEN:
+        if (!(s = lock_user_string(ARG(0))))
+            /* FIXME - should this error code be -TARGET_EFAULT ? */
+            return (uint32_t)-1;
+        if (ARG(1) >= 12)
+            return (uint32_t)-1;
+        if (strcmp(s, ":tt") == 0) {
+            if (ARG(1) < 4)
+                return STDIN_FILENO;
+            else
+                return STDOUT_FILENO;
+        }
+        if (use_gdb_syscalls()) {
+            gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", ARG(0),
+			   (int)ARG(2)+1, gdb_open_modeflags[ARG(1)]);
+            return env->regs[0];
+        } else {
+            ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
+        }
+        unlock_user(s, ARG(0), 0);
+        return ret;
+    case SYS_CLOSE:
+        if (use_gdb_syscalls()) {
+            gdb_do_syscall(arm_semi_cb, "close,%x", ARG(0));
+            return env->regs[0];
+        } else {
+            return set_swi_errno(ts, close(ARG(0)));
+        }
+    case SYS_WRITEC:
+        {
+          char c;
+
+          if (get_user_u8(c, args))
+              /* FIXME - should this error code be -TARGET_EFAULT ? */
+              return (uint32_t)-1;
+          /* Write to debug console.  stderr is near enough.  */
+          if (use_gdb_syscalls()) {
+                gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
+                return env->regs[0];
+          } else {
+                return write(STDERR_FILENO, &c, 1);
+          }
+        }
+    case SYS_WRITE0:
+        if (!(s = lock_user_string(args)))
+            /* FIXME - should this error code be -TARGET_EFAULT ? */
+            return (uint32_t)-1;
+        len = strlen(s);
+        if (use_gdb_syscalls()) {
+            gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
+            ret = env->regs[0];
+        } else {
+            ret = write(STDERR_FILENO, s, len);
+        }
+        unlock_user(s, args, 0);
+        return ret;
+    case SYS_WRITE:
+        len = ARG(2);
+        if (use_gdb_syscalls()) {
+            arm_semi_syscall_len = len;
+            gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len);
+            return env->regs[0];
+        } else {
+            if (!(s = lock_user(VERIFY_READ, ARG(1), len, 1)))
+                /* FIXME - should this error code be -TARGET_EFAULT ? */
+                return (uint32_t)-1;
+            ret = set_swi_errno(ts, write(ARG(0), s, len));
+            unlock_user(s, ARG(1), 0);
+            if (ret == (uint32_t)-1)
+                return -1;
+            return len - ret;
+        }
+    case SYS_READ:
+        len = ARG(2);
+        if (use_gdb_syscalls()) {
+            arm_semi_syscall_len = len;
+            gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len);
+            return env->regs[0];
+        } else {
+            if (!(s = lock_user(VERIFY_WRITE, ARG(1), len, 0)))
+                /* FIXME - should this error code be -TARGET_EFAULT ? */
+                return (uint32_t)-1;
+            do
+              ret = set_swi_errno(ts, read(ARG(0), s, len));
+            while (ret == -1 && errno == EINTR);
+            unlock_user(s, ARG(1), len);
+            if (ret == (uint32_t)-1)
+                return -1;
+            return len - ret;
+        }
+    case SYS_READC:
+       /* XXX: Read from debug cosole. Not implemented.  */
+        return 0;
+    case SYS_ISTTY:
+        if (use_gdb_syscalls()) {
+            gdb_do_syscall(arm_semi_cb, "isatty,%x", ARG(0));
+            return env->regs[0];
+        } else {
+            return isatty(ARG(0));
+        }
+    case SYS_SEEK:
+        if (use_gdb_syscalls()) {
+            gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", ARG(0), ARG(1));
+            return env->regs[0];
+        } else {
+            ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
+            if (ret == (uint32_t)-1)
+              return -1;
+            return 0;
+        }
+    case SYS_FLEN:
+        if (use_gdb_syscalls()) {
+            gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
+			   ARG(0), env->regs[13]-64);
+            return env->regs[0];
+        } else {
+            struct stat buf;
+            ret = set_swi_errno(ts, fstat(ARG(0), &buf));
+            if (ret == (uint32_t)-1)
+                return -1;
+            return buf.st_size;
+        }
+    case SYS_TMPNAM:
+        /* XXX: Not implemented.  */
+        return -1;
+    case SYS_REMOVE:
+        if (use_gdb_syscalls()) {
+            gdb_do_syscall(arm_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)+1);
+            ret = env->regs[0];
+        } else {
+            if (!(s = lock_user_string(ARG(0))))
+                /* FIXME - should this error code be -TARGET_EFAULT ? */
+                return (uint32_t)-1;
+            ret =  set_swi_errno(ts, remove(s));
+            unlock_user(s, ARG(0), 0);
+        }
+        return ret;
+    case SYS_RENAME:
+        if (use_gdb_syscalls()) {
+            gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
+                           ARG(0), (int)ARG(1)+1, ARG(2), (int)ARG(3)+1);
+            return env->regs[0];
+        } else {
+            char *s2;
+            s = lock_user_string(ARG(0));
+            s2 = lock_user_string(ARG(2));
+            if (!s || !s2)
+                /* FIXME - should this error code be -TARGET_EFAULT ? */
+                ret = (uint32_t)-1;
+            else
+                ret = set_swi_errno(ts, rename(s, s2));
+            if (s2)
+                unlock_user(s2, ARG(2), 0);
+            if (s)
+                unlock_user(s, ARG(0), 0);
+            return ret;
+        }
+    case SYS_CLOCK:
+        return clock() / (CLOCKS_PER_SEC / 100);
+    case SYS_TIME:
+        return set_swi_errno(ts, time(NULL));
+    case SYS_SYSTEM:
+        if (use_gdb_syscalls()) {
+            gdb_do_syscall(arm_semi_cb, "system,%s", ARG(0), (int)ARG(1)+1);
+            return env->regs[0];
+        } else {
+            if (!(s = lock_user_string(ARG(0))))
+                /* FIXME - should this error code be -TARGET_EFAULT ? */
+                return (uint32_t)-1;
+            ret = set_swi_errno(ts, system(s));
+            unlock_user(s, ARG(0), 0);
+            return ret;
+        }
+    case SYS_ERRNO:
+#ifdef CONFIG_USER_ONLY
+        return ts->swi_errno;
+#else
+        return syscall_err;
+#endif
+    case SYS_GET_CMDLINE:
+#ifdef CONFIG_USER_ONLY
+        /* Build a commandline from the original argv.  */
+        {
+            char **arg = ts->info->host_argv;
+            int len = ARG(1);
+            /* lock the buffer on the ARM side */
+            char *cmdline_buffer = (char*)lock_user(VERIFY_WRITE, ARG(0), len, 0);
+
+            if (!cmdline_buffer)
+                /* FIXME - should this error code be -TARGET_EFAULT ? */
+                return (uint32_t)-1;
+
+            s = cmdline_buffer;
+            while (*arg && len > 2) {
+                int n = strlen(*arg);
+
+                if (s != cmdline_buffer) {
+                    *(s++) = ' ';
+                    len--;
+                }
+                if (n >= len)
+                    n = len - 1;
+                memcpy(s, *arg, n);
+                s += n;
+                len -= n;
+                arg++;
+            }
+            /* Null terminate the string.  */
+            *s = 0;
+            len = s - cmdline_buffer;
+
+            /* Unlock the buffer on the ARM side.  */
+            unlock_user(cmdline_buffer, ARG(0), len);
+
+            /* Adjust the commandline length argument.  */
+            SET_ARG(1, len);
+
+            /* Return success if commandline fit into buffer.  */
+            return *arg ? -1 : 0;
+        }
+#else
+      return -1;
+#endif
+    case SYS_HEAPINFO:
+        {
+            uint32_t *ptr;
+            uint32_t limit;
+
+#ifdef CONFIG_USER_ONLY
+            /* Some C libraries assume the heap immediately follows .bss, so
+               allocate it using sbrk.  */
+            if (!ts->heap_limit) {
+                long ret;
+
+                ts->heap_base = do_brk(0);
+                limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
+                /* Try a big heap, and reduce the size if that fails.  */
+                for (;;) {
+                    ret = do_brk(limit);
+                    if (ret != -1)
+                        break;
+                    limit = (ts->heap_base >> 1) + (limit >> 1);
+                }
+                ts->heap_limit = limit;
+            }
+
+            if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
+                /* FIXME - should this error code be -TARGET_EFAULT ? */
+                return (uint32_t)-1;
+            ptr[0] = tswap32(ts->heap_base);
+            ptr[1] = tswap32(ts->heap_limit);
+            ptr[2] = tswap32(ts->stack_base);
+            ptr[3] = tswap32(0); /* Stack limit.  */
+            unlock_user(ptr, ARG(0), 16);
+#else
+            limit = ram_size;
+            if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
+                /* FIXME - should this error code be -TARGET_EFAULT ? */
+                return (uint32_t)-1;
+            /* TODO: Make this use the limit of the loaded application.  */
+            ptr[0] = tswap32(limit / 2);
+            ptr[1] = tswap32(limit);
+            ptr[2] = tswap32(limit); /* Stack base */
+            ptr[3] = tswap32(0); /* Stack limit.  */
+            unlock_user(ptr, ARG(0), 16);
+#endif
+            return 0;
+        }
+    case SYS_EXIT:
+        exit(0);
+    default:
+        fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
+        cpu_dump_state(env, stderr, fprintf, 0);
+        abort();
+    }
+}