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-rw-r--r--arm-semi.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/arm-semi.c b/arm-semi.c
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index 0000000000..4254cba84a
--- /dev/null
+++ b/arm-semi.c
@@ -0,0 +1,345 @@
+/*
+ * 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 "vl.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
+
+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;
+}
+
+static uint32_t softmmu_tget32(CPUState *env, uint32_t addr)
+{
+ uint32_t val;
+
+ cpu_memory_rw_debug(env, addr, (uint8_t *)&val, 4, 0);
+ return tswap32(val);
+}
+static uint32_t softmmu_tget8(CPUState *env, uint32_t addr)
+{
+ uint8_t val;
+
+ cpu_memory_rw_debug(env, addr, &val, 1, 0);
+ return val;
+}
+#define tget32(p) softmmu_tget32(env, p)
+#define tget8(p) softmmu_tget8(env, p)
+
+static void *softmmu_lock_user(CPUState *env, uint32_t addr, uint32_t len,
+ int copy)
+{
+ char *p;
+ /* TODO: Make this something that isn't fixed size. */
+ p = malloc(len);
+ if (copy)
+ cpu_memory_rw_debug(env, addr, p, len, 0);
+ return p;
+}
+#define lock_user(p, len, copy) softmmu_lock_user(env, p, len, copy)
+static char *softmmu_lock_user_string(CPUState *env, uint32_t addr)
+{
+ char *p;
+ char *s;
+ uint8_t c;
+ /* TODO: Make this something that isn't fixed size. */
+ s = p = malloc(1024);
+ do {
+ cpu_memory_rw_debug(env, addr, &c, 1, 0);
+ addr++;
+ *(p++) = c;
+ } while (c);
+ return s;
+}
+#define lock_user_string(p) softmmu_lock_user_string(env, p)
+static void softmmu_unlock_user(CPUState *env, void *p, target_ulong addr,
+ target_ulong len)
+{
+ if (len)
+ cpu_memory_rw_debug(env, addr, p, len, 1);
+ free(p);
+}
+#define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)
+#endif
+
+#define ARG(n) tget32(args + (n) * 4)
+#define SET_ARG(n, val) tput32(args + (n) * 4,val)
+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:
+ s = lock_user_string(ARG(0));
+ if (ARG(1) >= 12)
+ return (uint32_t)-1;
+ if (strcmp(s, ":tt") == 0) {
+ if (ARG(1) < 4)
+ return STDIN_FILENO;
+ else
+ return STDOUT_FILENO;
+ }
+ ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
+ unlock_user(s, ARG(0), 0);
+ return ret;
+ case SYS_CLOSE:
+ return set_swi_errno(ts, close(ARG(0)));
+ case SYS_WRITEC:
+ {
+ char c = tget8(args);
+ /* Write to debug console. stderr is near enough. */
+ return write(STDERR_FILENO, &c, 1);
+ }
+ case SYS_WRITE0:
+ s = lock_user_string(args);
+ ret = write(STDERR_FILENO, s, strlen(s));
+ unlock_user(s, args, 0);
+ return ret;
+ case SYS_WRITE:
+ len = ARG(2);
+ s = lock_user(ARG(1), len, 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 ARG(2) - ret;
+ case SYS_READ:
+ len = ARG(2);
+ s = lock_user(ARG(1), len, 0);
+ 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 ARG(2) - ret;
+ case SYS_READC:
+ /* XXX: Read from debug cosole. Not implemented. */
+ return 0;
+ case SYS_ISTTY:
+ return isatty(ARG(0));
+ case SYS_SEEK:
+ ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
+ if (ret == (uint32_t)-1)
+ return -1;
+ return 0;
+ case SYS_FLEN:
+ {
+ 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:
+ s = lock_user_string(ARG(0));
+ ret = set_swi_errno(ts, remove(s));
+ unlock_user(s, ARG(0), 0);
+ return ret;
+ case SYS_RENAME:
+ {
+ char *s2;
+ s = lock_user_string(ARG(0));
+ s2 = lock_user_string(ARG(2));
+ ret = set_swi_errno(ts, rename(s, s2));
+ unlock_user(s2, ARG(2), 0);
+ 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:
+ s = lock_user_string(ARG(0));
+ ret = set_swi_errno(ts, system(s));
+ unlock_user(s, ARG(0), 0);
+ case SYS_ERRNO:
+#ifdef CONFIG_USER_ONLY
+ return ts->swi_errno;
+#else
+ return 0;
+#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(ARG(0), len, 0);
+
+ 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;
+ }
+
+ ptr = lock_user(ARG(0), 16, 0);
+ 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;
+ ptr = lock_user(ARG(0), 16, 0);
+ /* 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();
+ }
+}
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