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-rw-r--r--target/arm/arm-semi.c656
1 files changed, 656 insertions, 0 deletions
diff --git a/target/arm/arm-semi.c b/target/arm/arm-semi.c
new file mode 100644
index 0000000000..7cac8734c7
--- /dev/null
+++ b/target/arm/arm-semi.c
@@ -0,0 +1,656 @@
+/*
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+
+#include "cpu.h"
+#include "exec/semihost.h"
+#ifdef CONFIG_USER_ONLY
+#include "qemu.h"
+
+#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
+#else
+#include "qemu-common.h"
+#include "exec/gdbstub.h"
+#include "hw/arm/arm.h"
+#include "qemu/cutils.h"
+#endif
+
+#define TARGET_SYS_OPEN 0x01
+#define TARGET_SYS_CLOSE 0x02
+#define TARGET_SYS_WRITEC 0x03
+#define TARGET_SYS_WRITE0 0x04
+#define TARGET_SYS_WRITE 0x05
+#define TARGET_SYS_READ 0x06
+#define TARGET_SYS_READC 0x07
+#define TARGET_SYS_ISTTY 0x09
+#define TARGET_SYS_SEEK 0x0a
+#define TARGET_SYS_FLEN 0x0c
+#define TARGET_SYS_TMPNAM 0x0d
+#define TARGET_SYS_REMOVE 0x0e
+#define TARGET_SYS_RENAME 0x0f
+#define TARGET_SYS_CLOCK 0x10
+#define TARGET_SYS_TIME 0x11
+#define TARGET_SYS_SYSTEM 0x12
+#define TARGET_SYS_ERRNO 0x13
+#define TARGET_SYS_GET_CMDLINE 0x15
+#define TARGET_SYS_HEAPINFO 0x16
+#define TARGET_SYS_EXIT 0x18
+#define TARGET_SYS_SYNCCACHE 0x19
+
+/* ADP_Stopped_ApplicationExit is used for exit(0),
+ * anything else is implemented as exit(1) */
+#define ADP_Stopped_ApplicationExit (0x20026)
+
+#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(CPUARMState *env, uint32_t code)
+{
+ return code;
+}
+
+#include "exec/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 *cs, target_ulong ret, target_ulong err)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+#ifdef CONFIG_USER_ONLY
+ TaskState *ts = cs->opaque;
+#endif
+ target_ulong reg0 = is_a64(env) ? env->xregs[0] : env->regs[0];
+
+ if (ret == (target_ulong)-1) {
+#ifdef CONFIG_USER_ONLY
+ ts->swi_errno = err;
+#else
+ syscall_err = err;
+#endif
+ reg0 = ret;
+ } else {
+ /* Fixup syscalls that use nonstardard return conventions. */
+ switch (reg0) {
+ case TARGET_SYS_WRITE:
+ case TARGET_SYS_READ:
+ reg0 = arm_semi_syscall_len - ret;
+ break;
+ case TARGET_SYS_SEEK:
+ reg0 = 0;
+ break;
+ default:
+ reg0 = ret;
+ break;
+ }
+ }
+ if (is_a64(env)) {
+ env->xregs[0] = reg0;
+ } else {
+ env->regs[0] = reg0;
+ }
+}
+
+static target_ulong arm_flen_buf(ARMCPU *cpu)
+{
+ /* Return an address in target memory of 64 bytes where the remote
+ * gdb should write its stat struct. (The format of this structure
+ * is defined by GDB's remote protocol and is not target-specific.)
+ * We put this on the guest's stack just below SP.
+ */
+ CPUARMState *env = &cpu->env;
+ target_ulong sp;
+
+ if (is_a64(env)) {
+ sp = env->xregs[31];
+ } else {
+ sp = env->regs[13];
+ }
+
+ return sp - 64;
+}
+
+static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ /* 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(cs, arm_flen_buf(cpu) + 32, (uint8_t *)&size, 4, 0);
+ size = be32_to_cpu(size);
+ if (is_a64(env)) {
+ env->xregs[0] = size;
+ } else {
+ env->regs[0] = size;
+ }
+#ifdef CONFIG_USER_ONLY
+ ((TaskState *)cs->opaque)->swi_errno = err;
+#else
+ syscall_err = err;
+#endif
+}
+
+static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
+ const char *fmt, ...)
+{
+ va_list va;
+ CPUARMState *env = &cpu->env;
+
+ va_start(va, fmt);
+ gdb_do_syscallv(cb, fmt, va);
+ va_end(va);
+
+ /* FIXME: we are implicitly relying on the syscall completing
+ * before this point, which is not guaranteed. We should
+ * put in an explicit synchronization between this and
+ * the callback function.
+ */
+
+ return is_a64(env) ? env->xregs[0] : env->regs[0];
+}
+
+/* Read the input value from the argument block; fail the semihosting
+ * call if the memory read fails.
+ */
+#define GET_ARG(n) do { \
+ if (is_a64(env)) { \
+ if (get_user_u64(arg ## n, args + (n) * 8)) { \
+ return -1; \
+ } \
+ } else { \
+ if (get_user_u32(arg ## n, args + (n) * 4)) { \
+ return -1; \
+ } \
+ } \
+} while (0)
+
+#define SET_ARG(n, val) \
+ (is_a64(env) ? \
+ put_user_u64(val, args + (n) * 8) : \
+ put_user_u32(val, args + (n) * 4))
+
+target_ulong do_arm_semihosting(CPUARMState *env)
+{
+ ARMCPU *cpu = arm_env_get_cpu(env);
+ CPUState *cs = CPU(cpu);
+ target_ulong args;
+ target_ulong arg0, arg1, arg2, arg3;
+ char * s;
+ int nr;
+ uint32_t ret;
+ uint32_t len;
+#ifdef CONFIG_USER_ONLY
+ TaskState *ts = cs->opaque;
+#else
+ CPUARMState *ts = env;
+#endif
+
+ if (is_a64(env)) {
+ /* Note that the syscall number is in W0, not X0 */
+ nr = env->xregs[0] & 0xffffffffU;
+ args = env->xregs[1];
+ } else {
+ nr = env->regs[0];
+ args = env->regs[1];
+ }
+
+ switch (nr) {
+ case TARGET_SYS_OPEN:
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ s = lock_user_string(arg0);
+ if (!s) {
+ /* FIXME - should this error code be -TARGET_EFAULT ? */
+ return (uint32_t)-1;
+ }
+ if (arg1 >= 12) {
+ unlock_user(s, arg0, 0);
+ return (uint32_t)-1;
+ }
+ if (strcmp(s, ":tt") == 0) {
+ int result_fileno = arg1 < 4 ? STDIN_FILENO : STDOUT_FILENO;
+ unlock_user(s, arg0, 0);
+ return result_fileno;
+ }
+ if (use_gdb_syscalls()) {
+ ret = arm_gdb_syscall(cpu, arm_semi_cb, "open,%s,%x,1a4", arg0,
+ (int)arg2+1, gdb_open_modeflags[arg1]);
+ } else {
+ ret = set_swi_errno(ts, open(s, open_modeflags[arg1], 0644));
+ }
+ unlock_user(s, arg0, 0);
+ return ret;
+ case TARGET_SYS_CLOSE:
+ GET_ARG(0);
+ if (use_gdb_syscalls()) {
+ return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", arg0);
+ } else {
+ return set_swi_errno(ts, close(arg0));
+ }
+ case TARGET_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()) {
+ return arm_gdb_syscall(cpu, arm_semi_cb, "write,2,%x,1", args);
+ } else {
+ return write(STDERR_FILENO, &c, 1);
+ }
+ }
+ case TARGET_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()) {
+ return arm_gdb_syscall(cpu, arm_semi_cb, "write,2,%x,%x",
+ args, len);
+ } else {
+ ret = write(STDERR_FILENO, s, len);
+ }
+ unlock_user(s, args, 0);
+ return ret;
+ case TARGET_SYS_WRITE:
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ len = arg2;
+ if (use_gdb_syscalls()) {
+ arm_semi_syscall_len = len;
+ return arm_gdb_syscall(cpu, arm_semi_cb, "write,%x,%x,%x",
+ arg0, arg1, len);
+ } else {
+ s = lock_user(VERIFY_READ, arg1, len, 1);
+ if (!s) {
+ /* FIXME - should this error code be -TARGET_EFAULT ? */
+ return (uint32_t)-1;
+ }
+ ret = set_swi_errno(ts, write(arg0, s, len));
+ unlock_user(s, arg1, 0);
+ if (ret == (uint32_t)-1)
+ return -1;
+ return len - ret;
+ }
+ case TARGET_SYS_READ:
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ len = arg2;
+ if (use_gdb_syscalls()) {
+ arm_semi_syscall_len = len;
+ return arm_gdb_syscall(cpu, arm_semi_cb, "read,%x,%x,%x",
+ arg0, arg1, len);
+ } else {
+ s = lock_user(VERIFY_WRITE, arg1, len, 0);
+ if (!s) {
+ /* FIXME - should this error code be -TARGET_EFAULT ? */
+ return (uint32_t)-1;
+ }
+ do {
+ ret = set_swi_errno(ts, read(arg0, s, len));
+ } while (ret == -1 && errno == EINTR);
+ unlock_user(s, arg1, len);
+ if (ret == (uint32_t)-1)
+ return -1;
+ return len - ret;
+ }
+ case TARGET_SYS_READC:
+ /* XXX: Read from debug console. Not implemented. */
+ return 0;
+ case TARGET_SYS_ISTTY:
+ GET_ARG(0);
+ if (use_gdb_syscalls()) {
+ return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", arg0);
+ } else {
+ return isatty(arg0);
+ }
+ case TARGET_SYS_SEEK:
+ GET_ARG(0);
+ GET_ARG(1);
+ if (use_gdb_syscalls()) {
+ return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0",
+ arg0, arg1);
+ } else {
+ ret = set_swi_errno(ts, lseek(arg0, arg1, SEEK_SET));
+ if (ret == (uint32_t)-1)
+ return -1;
+ return 0;
+ }
+ case TARGET_SYS_FLEN:
+ GET_ARG(0);
+ if (use_gdb_syscalls()) {
+ return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x",
+ arg0, arm_flen_buf(cpu));
+ } else {
+ struct stat buf;
+ ret = set_swi_errno(ts, fstat(arg0, &buf));
+ if (ret == (uint32_t)-1)
+ return -1;
+ return buf.st_size;
+ }
+ case TARGET_SYS_TMPNAM:
+ /* XXX: Not implemented. */
+ return -1;
+ case TARGET_SYS_REMOVE:
+ GET_ARG(0);
+ GET_ARG(1);
+ if (use_gdb_syscalls()) {
+ ret = arm_gdb_syscall(cpu, arm_semi_cb, "unlink,%s",
+ arg0, (int)arg1+1);
+ } else {
+ s = lock_user_string(arg0);
+ if (!s) {
+ /* FIXME - should this error code be -TARGET_EFAULT ? */
+ return (uint32_t)-1;
+ }
+ ret = set_swi_errno(ts, remove(s));
+ unlock_user(s, arg0, 0);
+ }
+ return ret;
+ case TARGET_SYS_RENAME:
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ GET_ARG(3);
+ if (use_gdb_syscalls()) {
+ return arm_gdb_syscall(cpu, arm_semi_cb, "rename,%s,%s",
+ arg0, (int)arg1+1, arg2, (int)arg3+1);
+ } else {
+ char *s2;
+ s = lock_user_string(arg0);
+ s2 = lock_user_string(arg2);
+ 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, arg2, 0);
+ if (s)
+ unlock_user(s, arg0, 0);
+ return ret;
+ }
+ case TARGET_SYS_CLOCK:
+ return clock() / (CLOCKS_PER_SEC / 100);
+ case TARGET_SYS_TIME:
+ return set_swi_errno(ts, time(NULL));
+ case TARGET_SYS_SYSTEM:
+ GET_ARG(0);
+ GET_ARG(1);
+ if (use_gdb_syscalls()) {
+ return arm_gdb_syscall(cpu, arm_semi_cb, "system,%s",
+ arg0, (int)arg1+1);
+ } else {
+ s = lock_user_string(arg0);
+ if (!s) {
+ /* FIXME - should this error code be -TARGET_EFAULT ? */
+ return (uint32_t)-1;
+ }
+ ret = set_swi_errno(ts, system(s));
+ unlock_user(s, arg0, 0);
+ return ret;
+ }
+ case TARGET_SYS_ERRNO:
+#ifdef CONFIG_USER_ONLY
+ return ts->swi_errno;
+#else
+ return syscall_err;
+#endif
+ case TARGET_SYS_GET_CMDLINE:
+ {
+ /* Build a command-line from the original argv.
+ *
+ * The inputs are:
+ * * arg0, pointer to a buffer of at least the size
+ * specified in arg1.
+ * * arg1, size of the buffer pointed to by arg0 in
+ * bytes.
+ *
+ * The outputs are:
+ * * arg0, pointer to null-terminated string of the
+ * command line.
+ * * arg1, length of the string pointed to by arg0.
+ */
+
+ char *output_buffer;
+ size_t input_size;
+ size_t output_size;
+ int status = 0;
+#if !defined(CONFIG_USER_ONLY)
+ const char *cmdline;
+#endif
+ GET_ARG(0);
+ GET_ARG(1);
+ input_size = arg1;
+ /* Compute the size of the output string. */
+#if !defined(CONFIG_USER_ONLY)
+ cmdline = semihosting_get_cmdline();
+ if (cmdline == NULL) {
+ cmdline = ""; /* Default to an empty line. */
+ }
+ output_size = strlen(cmdline) + 1; /* Count terminating 0. */
+#else
+ unsigned int i;
+
+ output_size = ts->info->arg_end - ts->info->arg_start;
+ if (!output_size) {
+ /* We special-case the "empty command line" case (argc==0).
+ Just provide the terminating 0. */
+ output_size = 1;
+ }
+#endif
+
+ if (output_size > input_size) {
+ /* Not enough space to store command-line arguments. */
+ return -1;
+ }
+
+ /* Adjust the command-line length. */
+ if (SET_ARG(1, output_size - 1)) {
+ /* Couldn't write back to argument block */
+ return -1;
+ }
+
+ /* Lock the buffer on the ARM side. */
+ output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
+ if (!output_buffer) {
+ return -1;
+ }
+
+ /* Copy the command-line arguments. */
+#if !defined(CONFIG_USER_ONLY)
+ pstrcpy(output_buffer, output_size, cmdline);
+#else
+ if (output_size == 1) {
+ /* Empty command-line. */
+ output_buffer[0] = '\0';
+ goto out;
+ }
+
+ if (copy_from_user(output_buffer, ts->info->arg_start,
+ output_size)) {
+ status = -1;
+ goto out;
+ }
+
+ /* Separate arguments by white spaces. */
+ for (i = 0; i < output_size - 1; i++) {
+ if (output_buffer[i] == 0) {
+ output_buffer[i] = ' ';
+ }
+ }
+ out:
+#endif
+ /* Unlock the buffer on the ARM side. */
+ unlock_user(output_buffer, arg0, output_size);
+
+ return status;
+ }
+ case TARGET_SYS_HEAPINFO:
+ {
+ target_ulong retvals[4];
+ target_ulong limit;
+ int i;
+
+ GET_ARG(0);
+
+#ifdef CONFIG_USER_ONLY
+ /* Some C libraries assume the heap immediately follows .bss, so
+ allocate it using sbrk. */
+ if (!ts->heap_limit) {
+ abi_ulong 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 >= limit) {
+ break;
+ }
+ limit = (ts->heap_base >> 1) + (limit >> 1);
+ }
+ ts->heap_limit = limit;
+ }
+
+ retvals[0] = ts->heap_base;
+ retvals[1] = ts->heap_limit;
+ retvals[2] = ts->stack_base;
+ retvals[3] = 0; /* Stack limit. */
+#else
+ limit = ram_size;
+ /* TODO: Make this use the limit of the loaded application. */
+ retvals[0] = limit / 2;
+ retvals[1] = limit;
+ retvals[2] = limit; /* Stack base */
+ retvals[3] = 0; /* Stack limit. */
+#endif
+
+ for (i = 0; i < ARRAY_SIZE(retvals); i++) {
+ bool fail;
+
+ if (is_a64(env)) {
+ fail = put_user_u64(retvals[i], arg0 + i * 8);
+ } else {
+ fail = put_user_u32(retvals[i], arg0 + i * 4);
+ }
+
+ if (fail) {
+ /* Couldn't write back to argument block */
+ return -1;
+ }
+ }
+ return 0;
+ }
+ case TARGET_SYS_EXIT:
+ if (is_a64(env)) {
+ /* The A64 version of this call takes a parameter block,
+ * so the application-exit type can return a subcode which
+ * is the exit status code from the application.
+ */
+ GET_ARG(0);
+ GET_ARG(1);
+
+ if (arg0 == ADP_Stopped_ApplicationExit) {
+ ret = arg1;
+ } else {
+ ret = 1;
+ }
+ } else {
+ /* ARM specifies only Stopped_ApplicationExit as normal
+ * exit, everything else is considered an error */
+ ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
+ }
+ gdb_exit(env, ret);
+ exit(ret);
+ case TARGET_SYS_SYNCCACHE:
+ /* Clean the D-cache and invalidate the I-cache for the specified
+ * virtual address range. This is a nop for us since we don't
+ * implement caches. This is only present on A64.
+ */
+ if (is_a64(env)) {
+ return 0;
+ }
+ /* fall through -- invalid for A32/T32 */
+ default:
+ fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
+ cpu_dump_state(cs, stderr, fprintf, 0);
+ abort();
+ }
+}
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