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/*
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* Arm "Angel" semihosting syscalls
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*
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* Copyright (c) 2005, 2007 CodeSourcery.
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* Written by Paul Brook.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <time.h> |
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|
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#include "cpu.h" |
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#ifdef CONFIG_USER_ONLY
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#include "qemu.h" |
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|
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#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024) |
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#else
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#include "qemu-common.h" |
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#include "gdbstub.h" |
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#include "hw/arm-misc.h" |
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#endif
|
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|
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#define SYS_OPEN 0x01 |
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#define SYS_CLOSE 0x02 |
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#define SYS_WRITEC 0x03 |
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#define SYS_WRITE0 0x04 |
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#define SYS_WRITE 0x05 |
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#define SYS_READ 0x06 |
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#define SYS_READC 0x07 |
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#define SYS_ISTTY 0x09 |
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#define SYS_SEEK 0x0a |
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#define SYS_FLEN 0x0c |
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#define SYS_TMPNAM 0x0d |
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#define SYS_REMOVE 0x0e |
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#define SYS_RENAME 0x0f |
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#define SYS_CLOCK 0x10 |
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#define SYS_TIME 0x11 |
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#define SYS_SYSTEM 0x12 |
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#define SYS_ERRNO 0x13 |
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#define SYS_GET_CMDLINE 0x15 |
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#define SYS_HEAPINFO 0x16 |
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#define SYS_EXIT 0x18 |
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|
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#ifndef O_BINARY
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#define O_BINARY 0 |
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#endif
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|
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#define GDB_O_RDONLY 0x000 |
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#define GDB_O_WRONLY 0x001 |
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#define GDB_O_RDWR 0x002 |
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#define GDB_O_APPEND 0x008 |
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#define GDB_O_CREAT 0x200 |
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#define GDB_O_TRUNC 0x400 |
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#define GDB_O_BINARY 0 |
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|
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static int gdb_open_modeflags[12] = { |
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GDB_O_RDONLY, |
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GDB_O_RDONLY | GDB_O_BINARY, |
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GDB_O_RDWR, |
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GDB_O_RDWR | GDB_O_BINARY, |
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GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC, |
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GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY, |
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GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC, |
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GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY, |
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GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND, |
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GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY, |
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GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND, |
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GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY |
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}; |
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|
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static int open_modeflags[12] = { |
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O_RDONLY, |
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O_RDONLY | O_BINARY, |
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O_RDWR, |
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O_RDWR | O_BINARY, |
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O_WRONLY | O_CREAT | O_TRUNC, |
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O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, |
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O_RDWR | O_CREAT | O_TRUNC, |
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O_RDWR | O_CREAT | O_TRUNC | O_BINARY, |
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O_WRONLY | O_CREAT | O_APPEND, |
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O_WRONLY | O_CREAT | O_APPEND | O_BINARY, |
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O_RDWR | O_CREAT | O_APPEND, |
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O_RDWR | O_CREAT | O_APPEND | O_BINARY |
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}; |
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|
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#ifdef CONFIG_USER_ONLY
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static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code) |
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{
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if (code == (uint32_t)-1) |
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ts->swi_errno = errno; |
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return code;
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} |
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#else
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static inline uint32_t set_swi_errno(CPUState *env, uint32_t code) |
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{
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return code;
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} |
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|
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#include "softmmu-semi.h" |
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#endif
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|
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static target_ulong arm_semi_syscall_len;
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|
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#if !defined(CONFIG_USER_ONLY)
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static target_ulong syscall_err;
|
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#endif
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|
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static void arm_semi_cb(CPUState *env, target_ulong ret, target_ulong err) |
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{
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#ifdef CONFIG_USER_ONLY
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TaskState *ts = env->opaque; |
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#endif
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|
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if (ret == (target_ulong)-1) { |
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#ifdef CONFIG_USER_ONLY
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ts->swi_errno = err; |
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#else
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syscall_err = err; |
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#endif
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env->regs[0] = ret;
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} else {
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/* Fixup syscalls that use nonstardard return conventions. */
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switch (env->regs[0]) { |
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case SYS_WRITE:
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case SYS_READ:
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env->regs[0] = arm_semi_syscall_len - ret;
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break;
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case SYS_SEEK:
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env->regs[0] = 0; |
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break;
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default:
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env->regs[0] = ret;
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break;
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} |
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} |
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} |
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|
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static void arm_semi_flen_cb(CPUState *env, target_ulong ret, target_ulong err) |
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{
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/* The size is always stored in big-endian order, extract
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the value. We assume the size always fit in 32 bits. */
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uint32_t size; |
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cpu_memory_rw_debug(env, env->regs[13]-64+32, (uint8_t *)&size, 4, 0); |
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env->regs[0] = be32_to_cpu(size);
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#ifdef CONFIG_USER_ONLY
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((TaskState *)env->opaque)->swi_errno = err; |
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#else
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syscall_err = err; |
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#endif
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} |
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|
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#define ARG(n) \
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({ \
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target_ulong __arg; \ |
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/* FIXME - handle get_user() failure */ \
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get_user_ual(__arg, args + (n) * 4); \
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__arg; \ |
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}) |
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#define SET_ARG(n, val) put_user_ual(val, args + (n) * 4) |
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uint32_t do_arm_semihosting(CPUState *env) |
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{
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target_ulong args; |
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char * s;
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int nr;
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uint32_t ret; |
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uint32_t len; |
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#ifdef CONFIG_USER_ONLY
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TaskState *ts = env->opaque; |
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#else
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CPUState *ts = env; |
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#endif
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|
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nr = env->regs[0];
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args = env->regs[1];
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switch (nr) {
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case SYS_OPEN:
|
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if (!(s = lock_user_string(ARG(0)))) |
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/* FIXME - should this error code be -TARGET_EFAULT ? */
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return (uint32_t)-1; |
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if (ARG(1) >= 12) |
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return (uint32_t)-1; |
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if (strcmp(s, ":tt") == 0) { |
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if (ARG(1) < 4) |
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return STDIN_FILENO;
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else
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return STDOUT_FILENO;
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} |
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if (use_gdb_syscalls()) {
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gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", ARG(0), |
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(int)ARG(2)+1, gdb_open_modeflags[ARG(1)]); |
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return env->regs[0]; |
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} else {
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ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644)); |
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} |
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unlock_user(s, ARG(0), 0); |
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return ret;
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case SYS_CLOSE:
|
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if (use_gdb_syscalls()) {
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gdb_do_syscall(arm_semi_cb, "close,%x", ARG(0)); |
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return env->regs[0]; |
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} else {
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return set_swi_errno(ts, close(ARG(0))); |
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} |
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case SYS_WRITEC:
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{
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char c;
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|
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if (get_user_u8(c, args))
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/* FIXME - should this error code be -TARGET_EFAULT ? */
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return (uint32_t)-1; |
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/* Write to debug console. stderr is near enough. */
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if (use_gdb_syscalls()) {
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gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
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return env->regs[0]; |
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} else {
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return write(STDERR_FILENO, &c, 1); |
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} |
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} |
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case SYS_WRITE0:
|
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if (!(s = lock_user_string(args)))
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/* FIXME - should this error code be -TARGET_EFAULT ? */
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return (uint32_t)-1; |
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len = strlen(s); |
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if (use_gdb_syscalls()) {
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gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
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ret = env->regs[0];
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} else {
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ret = write(STDERR_FILENO, s, len); |
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} |
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unlock_user(s, args, 0);
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return ret;
|
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case SYS_WRITE:
|
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len = ARG(2);
|
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if (use_gdb_syscalls()) {
|
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arm_semi_syscall_len = len; |
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gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len); |
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return env->regs[0]; |
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} else {
|
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if (!(s = lock_user(VERIFY_READ, ARG(1), len, 1))) |
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/* FIXME - should this error code be -TARGET_EFAULT ? */
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return (uint32_t)-1; |
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ret = set_swi_errno(ts, write(ARG(0), s, len));
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unlock_user(s, ARG(1), 0); |
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if (ret == (uint32_t)-1) |
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return -1; |
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return len - ret;
|
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} |
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case SYS_READ:
|
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len = ARG(2);
|
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if (use_gdb_syscalls()) {
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arm_semi_syscall_len = len; |
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gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len); |
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return env->regs[0]; |
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} else {
|
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if (!(s = lock_user(VERIFY_WRITE, ARG(1), len, 0))) |
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/* FIXME - should this error code be -TARGET_EFAULT ? */
|
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return (uint32_t)-1; |
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do
|
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ret = set_swi_errno(ts, read(ARG(0), s, len));
|
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while (ret == -1 && errno == EINTR); |
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unlock_user(s, ARG(1), len);
|
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if (ret == (uint32_t)-1) |
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return -1; |
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return len - ret;
|
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} |
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case SYS_READC:
|
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/* XXX: Read from debug cosole. Not implemented. */
|
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return 0; |
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case SYS_ISTTY:
|
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if (use_gdb_syscalls()) {
|
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gdb_do_syscall(arm_semi_cb, "isatty,%x", ARG(0)); |
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return env->regs[0]; |
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} else {
|
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return isatty(ARG(0)); |
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} |
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case SYS_SEEK:
|
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if (use_gdb_syscalls()) {
|
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gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", ARG(0), ARG(1)); |
| 296 |
return env->regs[0]; |
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} else {
|
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ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET)); |
| 299 |
if (ret == (uint32_t)-1) |
| 300 |
return -1; |
| 301 |
return 0; |
| 302 |
} |
| 303 |
case SYS_FLEN:
|
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if (use_gdb_syscalls()) {
|
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gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
|
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ARG(0), env->regs[13]-64); |
| 307 |
return env->regs[0]; |
| 308 |
} else {
|
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struct stat buf;
|
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ret = set_swi_errno(ts, fstat(ARG(0), &buf));
|
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if (ret == (uint32_t)-1) |
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return -1; |
| 313 |
return buf.st_size;
|
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} |
| 315 |
case SYS_TMPNAM:
|
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/* XXX: Not implemented. */
|
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return -1; |
| 318 |
case SYS_REMOVE:
|
| 319 |
if (use_gdb_syscalls()) {
|
| 320 |
gdb_do_syscall(arm_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)+1); |
| 321 |
ret = env->regs[0];
|
| 322 |
} else {
|
| 323 |
if (!(s = lock_user_string(ARG(0)))) |
| 324 |
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
| 325 |
return (uint32_t)-1; |
| 326 |
ret = set_swi_errno(ts, remove(s)); |
| 327 |
unlock_user(s, ARG(0), 0); |
| 328 |
} |
| 329 |
return ret;
|
| 330 |
case SYS_RENAME:
|
| 331 |
if (use_gdb_syscalls()) {
|
| 332 |
gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
|
| 333 |
ARG(0), (int)ARG(1)+1, ARG(2), (int)ARG(3)+1); |
| 334 |
return env->regs[0]; |
| 335 |
} else {
|
| 336 |
char *s2;
|
| 337 |
s = lock_user_string(ARG(0));
|
| 338 |
s2 = lock_user_string(ARG(2));
|
| 339 |
if (!s || !s2)
|
| 340 |
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
| 341 |
ret = (uint32_t)-1;
|
| 342 |
else
|
| 343 |
ret = set_swi_errno(ts, rename(s, s2)); |
| 344 |
if (s2)
|
| 345 |
unlock_user(s2, ARG(2), 0); |
| 346 |
if (s)
|
| 347 |
unlock_user(s, ARG(0), 0); |
| 348 |
return ret;
|
| 349 |
} |
| 350 |
case SYS_CLOCK:
|
| 351 |
return clock() / (CLOCKS_PER_SEC / 100); |
| 352 |
case SYS_TIME:
|
| 353 |
return set_swi_errno(ts, time(NULL)); |
| 354 |
case SYS_SYSTEM:
|
| 355 |
if (use_gdb_syscalls()) {
|
| 356 |
gdb_do_syscall(arm_semi_cb, "system,%s", ARG(0), (int)ARG(1)+1); |
| 357 |
return env->regs[0]; |
| 358 |
} else {
|
| 359 |
if (!(s = lock_user_string(ARG(0)))) |
| 360 |
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
| 361 |
return (uint32_t)-1; |
| 362 |
ret = set_swi_errno(ts, system(s)); |
| 363 |
unlock_user(s, ARG(0), 0); |
| 364 |
return ret;
|
| 365 |
} |
| 366 |
case SYS_ERRNO:
|
| 367 |
#ifdef CONFIG_USER_ONLY
|
| 368 |
return ts->swi_errno;
|
| 369 |
#else
|
| 370 |
return syscall_err;
|
| 371 |
#endif
|
| 372 |
case SYS_GET_CMDLINE:
|
| 373 |
{
|
| 374 |
/* Build a command-line from the original argv.
|
| 375 |
*
|
| 376 |
* The inputs are:
|
| 377 |
* * ARG(0), pointer to a buffer of at least the size
|
| 378 |
* specified in ARG(1).
|
| 379 |
* * ARG(1), size of the buffer pointed to by ARG(0) in
|
| 380 |
* bytes.
|
| 381 |
*
|
| 382 |
* The outputs are:
|
| 383 |
* * ARG(0), pointer to null-terminated string of the
|
| 384 |
* command line.
|
| 385 |
* * ARG(1), length of the string pointed to by ARG(0).
|
| 386 |
*/
|
| 387 |
|
| 388 |
char *output_buffer;
|
| 389 |
size_t input_size = ARG(1);
|
| 390 |
size_t output_size; |
| 391 |
int status = 0; |
| 392 |
|
| 393 |
/* Compute the size of the output string. */
|
| 394 |
#if !defined(CONFIG_USER_ONLY)
|
| 395 |
output_size = strlen(ts->boot_info->kernel_filename) |
| 396 |
+ 1 /* Separating space. */ |
| 397 |
+ strlen(ts->boot_info->kernel_cmdline) |
| 398 |
+ 1; /* Terminating null byte. */ |
| 399 |
#else
|
| 400 |
unsigned int i; |
| 401 |
|
| 402 |
output_size = ts->info->arg_end - ts->info->arg_start; |
| 403 |
if (!output_size) {
|
| 404 |
/* We special-case the "empty command line" case (argc==0).
|
| 405 |
Just provide the terminating 0. */
|
| 406 |
output_size = 1;
|
| 407 |
} |
| 408 |
#endif
|
| 409 |
|
| 410 |
if (output_size > input_size) {
|
| 411 |
/* Not enough space to store command-line arguments. */
|
| 412 |
return -1; |
| 413 |
} |
| 414 |
|
| 415 |
/* Adjust the command-line length. */
|
| 416 |
SET_ARG(1, output_size - 1); |
| 417 |
|
| 418 |
/* Lock the buffer on the ARM side. */
|
| 419 |
output_buffer = lock_user(VERIFY_WRITE, ARG(0), output_size, 0); |
| 420 |
if (!output_buffer) {
|
| 421 |
return -1; |
| 422 |
} |
| 423 |
|
| 424 |
/* Copy the command-line arguments. */
|
| 425 |
#if !defined(CONFIG_USER_ONLY)
|
| 426 |
pstrcpy(output_buffer, output_size, ts->boot_info->kernel_filename); |
| 427 |
pstrcat(output_buffer, output_size, " ");
|
| 428 |
pstrcat(output_buffer, output_size, ts->boot_info->kernel_cmdline); |
| 429 |
#else
|
| 430 |
if (output_size == 1) { |
| 431 |
/* Empty command-line. */
|
| 432 |
output_buffer[0] = '\0'; |
| 433 |
goto out;
|
| 434 |
} |
| 435 |
|
| 436 |
if (copy_from_user(output_buffer, ts->info->arg_start,
|
| 437 |
output_size)) {
|
| 438 |
status = -1;
|
| 439 |
goto out;
|
| 440 |
} |
| 441 |
|
| 442 |
/* Separate arguments by white spaces. */
|
| 443 |
for (i = 0; i < output_size - 1; i++) { |
| 444 |
if (output_buffer[i] == 0) { |
| 445 |
output_buffer[i] = ' ';
|
| 446 |
} |
| 447 |
} |
| 448 |
out:
|
| 449 |
#endif
|
| 450 |
/* Unlock the buffer on the ARM side. */
|
| 451 |
unlock_user(output_buffer, ARG(0), output_size);
|
| 452 |
|
| 453 |
return status;
|
| 454 |
} |
| 455 |
case SYS_HEAPINFO:
|
| 456 |
{
|
| 457 |
uint32_t *ptr; |
| 458 |
uint32_t limit; |
| 459 |
|
| 460 |
#ifdef CONFIG_USER_ONLY
|
| 461 |
/* Some C libraries assume the heap immediately follows .bss, so
|
| 462 |
allocate it using sbrk. */
|
| 463 |
if (!ts->heap_limit) {
|
| 464 |
abi_ulong ret; |
| 465 |
|
| 466 |
ts->heap_base = do_brk(0);
|
| 467 |
limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE; |
| 468 |
/* Try a big heap, and reduce the size if that fails. */
|
| 469 |
for (;;) {
|
| 470 |
ret = do_brk(limit); |
| 471 |
if (ret >= limit) {
|
| 472 |
break;
|
| 473 |
} |
| 474 |
limit = (ts->heap_base >> 1) + (limit >> 1); |
| 475 |
} |
| 476 |
ts->heap_limit = limit; |
| 477 |
} |
| 478 |
|
| 479 |
if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0))) |
| 480 |
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
| 481 |
return (uint32_t)-1; |
| 482 |
ptr[0] = tswap32(ts->heap_base);
|
| 483 |
ptr[1] = tswap32(ts->heap_limit);
|
| 484 |
ptr[2] = tswap32(ts->stack_base);
|
| 485 |
ptr[3] = tswap32(0); /* Stack limit. */ |
| 486 |
unlock_user(ptr, ARG(0), 16); |
| 487 |
#else
|
| 488 |
limit = ram_size; |
| 489 |
if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0))) |
| 490 |
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
| 491 |
return (uint32_t)-1; |
| 492 |
/* TODO: Make this use the limit of the loaded application. */
|
| 493 |
ptr[0] = tswap32(limit / 2); |
| 494 |
ptr[1] = tswap32(limit);
|
| 495 |
ptr[2] = tswap32(limit); /* Stack base */ |
| 496 |
ptr[3] = tswap32(0); /* Stack limit. */ |
| 497 |
unlock_user(ptr, ARG(0), 16); |
| 498 |
#endif
|
| 499 |
return 0; |
| 500 |
} |
| 501 |
case SYS_EXIT:
|
| 502 |
gdb_exit(env, 0);
|
| 503 |
exit(0);
|
| 504 |
default:
|
| 505 |
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
|
| 506 |
cpu_dump_state(env, stderr, fprintf, 0);
|
| 507 |
abort(); |
| 508 |
} |
| 509 |
} |