root / target-arm / arm-semi.c @ 31a32289
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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 TARGET_SYS_OPEN 0x01 |
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#define TARGET_SYS_CLOSE 0x02 |
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#define TARGET_SYS_WRITEC 0x03 |
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#define TARGET_SYS_WRITE0 0x04 |
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#define TARGET_SYS_WRITE 0x05 |
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#define TARGET_SYS_READ 0x06 |
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#define TARGET_SYS_READC 0x07 |
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#define TARGET_SYS_ISTTY 0x09 |
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#define TARGET_SYS_SEEK 0x0a |
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#define TARGET_SYS_FLEN 0x0c |
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#define TARGET_SYS_TMPNAM 0x0d |
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#define TARGET_SYS_REMOVE 0x0e |
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#define TARGET_SYS_RENAME 0x0f |
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#define TARGET_SYS_CLOCK 0x10 |
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#define TARGET_SYS_TIME 0x11 |
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#define TARGET_SYS_SYSTEM 0x12 |
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#define TARGET_SYS_ERRNO 0x13 |
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#define TARGET_SYS_GET_CMDLINE 0x15 |
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#define TARGET_SYS_HEAPINFO 0x16 |
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#define TARGET_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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#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(CPUARMState *env, uint32_t code) |
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{
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return code;
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} |
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#include "softmmu-semi.h" |
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#endif
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static target_ulong arm_semi_syscall_len;
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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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static void arm_semi_cb(CPUARMState *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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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 TARGET_SYS_WRITE:
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case TARGET_SYS_READ:
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env->regs[0] = arm_semi_syscall_len - ret;
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break;
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case TARGET_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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static void arm_semi_flen_cb(CPUARMState *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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/* Read the input value from the argument block; fail the semihosting
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* call if the memory read fails.
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*/
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#define GET_ARG(n) do { \ |
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if (get_user_ual(arg ## n, args + (n) * 4)) { \ |
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return (uint32_t)-1; \ |
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} \ |
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} while (0) |
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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(CPUARMState *env) |
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{
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target_ulong args; |
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target_ulong arg0, arg1, arg2, arg3; |
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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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CPUARMState *ts = env; |
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#endif
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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 TARGET_SYS_OPEN:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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s = lock_user_string(arg0); |
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if (!s) {
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/* FIXME - should this error code be -TARGET_EFAULT ? */
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return (uint32_t)-1; |
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} |
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if (arg1 >= 12) { |
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unlock_user(s, arg0, 0);
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return (uint32_t)-1; |
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} |
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if (strcmp(s, ":tt") == 0) { |
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int result_fileno = arg1 < 4 ? STDIN_FILENO : STDOUT_FILENO; |
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unlock_user(s, arg0, 0);
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return result_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", arg0,
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(int)arg2+1, gdb_open_modeflags[arg1]); |
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ret = env->regs[0];
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} else {
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ret = set_swi_errno(ts, open(s, open_modeflags[arg1], 0644));
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} |
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unlock_user(s, arg0, 0);
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return ret;
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case TARGET_SYS_CLOSE:
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GET_ARG(0);
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if (use_gdb_syscalls()) {
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gdb_do_syscall(arm_semi_cb, "close,%x", arg0);
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return env->regs[0]; |
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} else {
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return set_swi_errno(ts, close(arg0));
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} |
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case TARGET_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 TARGET_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 TARGET_SYS_WRITE:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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len = arg2; |
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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", arg0, arg1, len);
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return env->regs[0]; |
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} else {
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s = lock_user(VERIFY_READ, arg1, len, 1);
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if (!s) {
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/* FIXME - should this error code be -TARGET_EFAULT ? */
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return (uint32_t)-1; |
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} |
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ret = set_swi_errno(ts, write(arg0, s, len)); |
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unlock_user(s, arg1, 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 TARGET_SYS_READ:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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len = arg2; |
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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", arg0, arg1, len);
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return env->regs[0]; |
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} else {
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s = lock_user(VERIFY_WRITE, arg1, len, 0);
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if (!s) {
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/* FIXME - should this error code be -TARGET_EFAULT ? */
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return (uint32_t)-1; |
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} |
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do {
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ret = set_swi_errno(ts, read(arg0, s, len)); |
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} while (ret == -1 && errno == EINTR); |
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unlock_user(s, arg1, 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 TARGET_SYS_READC:
|
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/* XXX: Read from debug console. Not implemented. */
|
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return 0; |
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case TARGET_SYS_ISTTY:
|
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GET_ARG(0);
|
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if (use_gdb_syscalls()) {
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gdb_do_syscall(arm_semi_cb, "isatty,%x", arg0);
|
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return env->regs[0]; |
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} else {
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return isatty(arg0);
|
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} |
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case TARGET_SYS_SEEK:
|
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GET_ARG(0);
|
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GET_ARG(1);
|
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if (use_gdb_syscalls()) {
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gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", arg0, arg1);
|
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return env->regs[0]; |
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} else {
|
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ret = set_swi_errno(ts, lseek(arg0, arg1, SEEK_SET)); |
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if (ret == (uint32_t)-1) |
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return -1; |
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return 0; |
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} |
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case TARGET_SYS_FLEN:
|
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GET_ARG(0);
|
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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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arg0, env->regs[13]-64); |
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return env->regs[0]; |
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} else {
|
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struct stat buf;
|
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ret = set_swi_errno(ts, fstat(arg0, &buf)); |
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if (ret == (uint32_t)-1) |
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return -1; |
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return buf.st_size;
|
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} |
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case TARGET_SYS_TMPNAM:
|
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/* XXX: Not implemented. */
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return -1; |
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case TARGET_SYS_REMOVE:
|
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GET_ARG(0);
|
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GET_ARG(1);
|
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if (use_gdb_syscalls()) {
|
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gdb_do_syscall(arm_semi_cb, "unlink,%s", arg0, (int)arg1+1); |
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ret = env->regs[0];
|
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} else {
|
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s = lock_user_string(arg0); |
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if (!s) {
|
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/* FIXME - should this error code be -TARGET_EFAULT ? */
|
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return (uint32_t)-1; |
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} |
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ret = set_swi_errno(ts, remove(s)); |
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unlock_user(s, arg0, 0);
|
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} |
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return ret;
|
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case TARGET_SYS_RENAME:
|
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GET_ARG(0);
|
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GET_ARG(1);
|
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GET_ARG(2);
|
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GET_ARG(3);
|
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if (use_gdb_syscalls()) {
|
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gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
|
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arg0, (int)arg1+1, arg2, (int)arg3+1); |
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return env->regs[0]; |
| 367 |
} else {
|
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char *s2;
|
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s = lock_user_string(arg0); |
| 370 |
s2 = lock_user_string(arg2); |
| 371 |
if (!s || !s2)
|
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/* FIXME - should this error code be -TARGET_EFAULT ? */
|
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ret = (uint32_t)-1;
|
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else
|
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ret = set_swi_errno(ts, rename(s, s2)); |
| 376 |
if (s2)
|
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unlock_user(s2, arg2, 0);
|
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if (s)
|
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unlock_user(s, arg0, 0);
|
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return ret;
|
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} |
| 382 |
case TARGET_SYS_CLOCK:
|
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return clock() / (CLOCKS_PER_SEC / 100); |
| 384 |
case TARGET_SYS_TIME:
|
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return set_swi_errno(ts, time(NULL)); |
| 386 |
case TARGET_SYS_SYSTEM:
|
| 387 |
GET_ARG(0);
|
| 388 |
GET_ARG(1);
|
| 389 |
if (use_gdb_syscalls()) {
|
| 390 |
gdb_do_syscall(arm_semi_cb, "system,%s", arg0, (int)arg1+1); |
| 391 |
return env->regs[0]; |
| 392 |
} else {
|
| 393 |
s = lock_user_string(arg0); |
| 394 |
if (!s) {
|
| 395 |
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
| 396 |
return (uint32_t)-1; |
| 397 |
} |
| 398 |
ret = set_swi_errno(ts, system(s)); |
| 399 |
unlock_user(s, arg0, 0);
|
| 400 |
return ret;
|
| 401 |
} |
| 402 |
case TARGET_SYS_ERRNO:
|
| 403 |
#ifdef CONFIG_USER_ONLY
|
| 404 |
return ts->swi_errno;
|
| 405 |
#else
|
| 406 |
return syscall_err;
|
| 407 |
#endif
|
| 408 |
case TARGET_SYS_GET_CMDLINE:
|
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{
|
| 410 |
/* Build a command-line from the original argv.
|
| 411 |
*
|
| 412 |
* The inputs are:
|
| 413 |
* * arg0, pointer to a buffer of at least the size
|
| 414 |
* specified in arg1.
|
| 415 |
* * arg1, size of the buffer pointed to by arg0 in
|
| 416 |
* bytes.
|
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*
|
| 418 |
* The outputs are:
|
| 419 |
* * arg0, pointer to null-terminated string of the
|
| 420 |
* command line.
|
| 421 |
* * arg1, length of the string pointed to by arg0.
|
| 422 |
*/
|
| 423 |
|
| 424 |
char *output_buffer;
|
| 425 |
size_t input_size; |
| 426 |
size_t output_size; |
| 427 |
int status = 0; |
| 428 |
GET_ARG(0);
|
| 429 |
GET_ARG(1);
|
| 430 |
input_size = arg1; |
| 431 |
/* Compute the size of the output string. */
|
| 432 |
#if !defined(CONFIG_USER_ONLY)
|
| 433 |
output_size = strlen(ts->boot_info->kernel_filename) |
| 434 |
+ 1 /* Separating space. */ |
| 435 |
+ strlen(ts->boot_info->kernel_cmdline) |
| 436 |
+ 1; /* Terminating null byte. */ |
| 437 |
#else
|
| 438 |
unsigned int i; |
| 439 |
|
| 440 |
output_size = ts->info->arg_end - ts->info->arg_start; |
| 441 |
if (!output_size) {
|
| 442 |
/* We special-case the "empty command line" case (argc==0).
|
| 443 |
Just provide the terminating 0. */
|
| 444 |
output_size = 1;
|
| 445 |
} |
| 446 |
#endif
|
| 447 |
|
| 448 |
if (output_size > input_size) {
|
| 449 |
/* Not enough space to store command-line arguments. */
|
| 450 |
return -1; |
| 451 |
} |
| 452 |
|
| 453 |
/* Adjust the command-line length. */
|
| 454 |
if (SET_ARG(1, output_size - 1)) { |
| 455 |
/* Couldn't write back to argument block */
|
| 456 |
return -1; |
| 457 |
} |
| 458 |
|
| 459 |
/* Lock the buffer on the ARM side. */
|
| 460 |
output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
|
| 461 |
if (!output_buffer) {
|
| 462 |
return -1; |
| 463 |
} |
| 464 |
|
| 465 |
/* Copy the command-line arguments. */
|
| 466 |
#if !defined(CONFIG_USER_ONLY)
|
| 467 |
pstrcpy(output_buffer, output_size, ts->boot_info->kernel_filename); |
| 468 |
pstrcat(output_buffer, output_size, " ");
|
| 469 |
pstrcat(output_buffer, output_size, ts->boot_info->kernel_cmdline); |
| 470 |
#else
|
| 471 |
if (output_size == 1) { |
| 472 |
/* Empty command-line. */
|
| 473 |
output_buffer[0] = '\0'; |
| 474 |
goto out;
|
| 475 |
} |
| 476 |
|
| 477 |
if (copy_from_user(output_buffer, ts->info->arg_start,
|
| 478 |
output_size)) {
|
| 479 |
status = -1;
|
| 480 |
goto out;
|
| 481 |
} |
| 482 |
|
| 483 |
/* Separate arguments by white spaces. */
|
| 484 |
for (i = 0; i < output_size - 1; i++) { |
| 485 |
if (output_buffer[i] == 0) { |
| 486 |
output_buffer[i] = ' ';
|
| 487 |
} |
| 488 |
} |
| 489 |
out:
|
| 490 |
#endif
|
| 491 |
/* Unlock the buffer on the ARM side. */
|
| 492 |
unlock_user(output_buffer, arg0, output_size); |
| 493 |
|
| 494 |
return status;
|
| 495 |
} |
| 496 |
case TARGET_SYS_HEAPINFO:
|
| 497 |
{
|
| 498 |
uint32_t *ptr; |
| 499 |
uint32_t limit; |
| 500 |
GET_ARG(0);
|
| 501 |
|
| 502 |
#ifdef CONFIG_USER_ONLY
|
| 503 |
/* Some C libraries assume the heap immediately follows .bss, so
|
| 504 |
allocate it using sbrk. */
|
| 505 |
if (!ts->heap_limit) {
|
| 506 |
abi_ulong ret; |
| 507 |
|
| 508 |
ts->heap_base = do_brk(0);
|
| 509 |
limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE; |
| 510 |
/* Try a big heap, and reduce the size if that fails. */
|
| 511 |
for (;;) {
|
| 512 |
ret = do_brk(limit); |
| 513 |
if (ret >= limit) {
|
| 514 |
break;
|
| 515 |
} |
| 516 |
limit = (ts->heap_base >> 1) + (limit >> 1); |
| 517 |
} |
| 518 |
ts->heap_limit = limit; |
| 519 |
} |
| 520 |
|
| 521 |
ptr = lock_user(VERIFY_WRITE, arg0, 16, 0); |
| 522 |
if (!ptr) {
|
| 523 |
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
| 524 |
return (uint32_t)-1; |
| 525 |
} |
| 526 |
ptr[0] = tswap32(ts->heap_base);
|
| 527 |
ptr[1] = tswap32(ts->heap_limit);
|
| 528 |
ptr[2] = tswap32(ts->stack_base);
|
| 529 |
ptr[3] = tswap32(0); /* Stack limit. */ |
| 530 |
unlock_user(ptr, arg0, 16);
|
| 531 |
#else
|
| 532 |
limit = ram_size; |
| 533 |
ptr = lock_user(VERIFY_WRITE, arg0, 16, 0); |
| 534 |
if (!ptr) {
|
| 535 |
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
| 536 |
return (uint32_t)-1; |
| 537 |
} |
| 538 |
/* TODO: Make this use the limit of the loaded application. */
|
| 539 |
ptr[0] = tswap32(limit / 2); |
| 540 |
ptr[1] = tswap32(limit);
|
| 541 |
ptr[2] = tswap32(limit); /* Stack base */ |
| 542 |
ptr[3] = tswap32(0); /* Stack limit. */ |
| 543 |
unlock_user(ptr, arg0, 16);
|
| 544 |
#endif
|
| 545 |
return 0; |
| 546 |
} |
| 547 |
case TARGET_SYS_EXIT:
|
| 548 |
gdb_exit(env, 0);
|
| 549 |
exit(0);
|
| 550 |
default:
|
| 551 |
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
|
| 552 |
cpu_dump_state(env, stderr, fprintf, 0);
|
| 553 |
abort(); |
| 554 |
} |
| 555 |
} |