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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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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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#include "cpu.h" |
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#ifdef CONFIG_USER_ONLY
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#include "qemu.h" |
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#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024) |
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#else
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#include "vl.h" |
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#endif
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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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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(CPUState *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(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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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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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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#define ARG(n) tget32(args + (n) * 4) |
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#define SET_ARG(n, val) tput32(args + (n) * 4,val) |
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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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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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s = lock_user_string(ARG(0));
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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 = tget8(args);
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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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s = lock_user_string(args); |
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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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s = lock_user(ARG(1), len, 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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s = lock_user(ARG(1), len, 0); |
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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)); |
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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)); |
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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 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); |
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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(ARG(0), &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 SYS_TMPNAM:
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/* XXX: Not implemented. */
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return -1; |
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case SYS_REMOVE:
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if (use_gdb_syscalls()) {
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gdb_do_syscall(arm_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)+1); |
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ret = env->regs[0];
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} else {
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s = lock_user_string(ARG(0));
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ret = set_swi_errno(ts, remove(s)); |
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unlock_user(s, ARG(0), 0); |
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} |
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return ret;
|
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case SYS_RENAME:
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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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ARG(0), (int)ARG(1)+1, ARG(2), (int)ARG(3)+1); |
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return env->regs[0]; |
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} else {
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char *s2;
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s = lock_user_string(ARG(0));
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s2 = lock_user_string(ARG(2));
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ret = set_swi_errno(ts, rename(s, s2)); |
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unlock_user(s2, ARG(2), 0); |
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unlock_user(s, ARG(0), 0); |
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return ret;
|
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} |
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case SYS_CLOCK:
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return clock() / (CLOCKS_PER_SEC / 100); |
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case SYS_TIME:
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return set_swi_errno(ts, time(NULL)); |
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case SYS_SYSTEM:
|
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if (use_gdb_syscalls()) {
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gdb_do_syscall(arm_semi_cb, "system,%s", ARG(0), (int)ARG(1)+1); |
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return env->regs[0]; |
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} else {
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s = lock_user_string(ARG(0));
|
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ret = set_swi_errno(ts, system(s)); |
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unlock_user(s, ARG(0), 0); |
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} |
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case SYS_ERRNO:
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#ifdef CONFIG_USER_ONLY
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return ts->swi_errno;
|
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#else
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return syscall_err;
|
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#endif
|
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case SYS_GET_CMDLINE:
|
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#ifdef CONFIG_USER_ONLY
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/* Build a commandline from the original argv. */
|
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{
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char **arg = ts->info->host_argv;
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int len = ARG(1); |
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/* lock the buffer on the ARM side */
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char *cmdline_buffer = (char*)lock_user(ARG(0), len, 0); |
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|
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s = cmdline_buffer; |
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while (*arg && len > 2) { |
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int n = strlen(*arg);
|
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|
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if (s != cmdline_buffer) {
|
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*(s++) = ' ';
|
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len--; |
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} |
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if (n >= len)
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n = len - 1;
|
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memcpy(s, *arg, n); |
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s += n; |
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len -= n; |
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arg++; |
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} |
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/* Null terminate the string. */
|
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*s = 0;
|
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len = s - cmdline_buffer; |
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|
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/* Unlock the buffer on the ARM side. */
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unlock_user(cmdline_buffer, ARG(0), len);
|
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|
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/* Adjust the commandline length argument. */
|
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SET_ARG(1, len);
|
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|
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/* Return success if commandline fit into buffer. */
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return *arg ? -1 : 0; |
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} |
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#else
|
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return -1; |
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#endif
|
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case SYS_HEAPINFO:
|
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{
|
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uint32_t *ptr; |
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uint32_t limit; |
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|
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#ifdef CONFIG_USER_ONLY
|
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/* Some C libraries assume the heap immediately follows .bss, so
|
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allocate it using sbrk. */
|
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if (!ts->heap_limit) {
|
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long ret;
|
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|
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ts->heap_base = do_brk(0);
|
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limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE; |
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/* Try a big heap, and reduce the size if that fails. */
|
| 396 |
for (;;) {
|
| 397 |
ret = do_brk(limit); |
| 398 |
if (ret != -1) |
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break;
|
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limit = (ts->heap_base >> 1) + (limit >> 1); |
| 401 |
} |
| 402 |
ts->heap_limit = limit; |
| 403 |
} |
| 404 |
|
| 405 |
ptr = lock_user(ARG(0), 16, 0); |
| 406 |
ptr[0] = tswap32(ts->heap_base);
|
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ptr[1] = tswap32(ts->heap_limit);
|
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ptr[2] = tswap32(ts->stack_base);
|
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ptr[3] = tswap32(0); /* Stack limit. */ |
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unlock_user(ptr, ARG(0), 16); |
| 411 |
#else
|
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limit = ram_size; |
| 413 |
ptr = lock_user(ARG(0), 16, 0); |
| 414 |
/* TODO: Make this use the limit of the loaded application. */
|
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ptr[0] = tswap32(limit / 2); |
| 416 |
ptr[1] = tswap32(limit);
|
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ptr[2] = tswap32(limit); /* Stack base */ |
| 418 |
ptr[3] = tswap32(0); /* Stack limit. */ |
| 419 |
unlock_user(ptr, ARG(0), 16); |
| 420 |
#endif
|
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return 0; |
| 422 |
} |
| 423 |
case SYS_EXIT:
|
| 424 |
exit(0);
|
| 425 |
default:
|
| 426 |
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
|
| 427 |
cpu_dump_state(env, stderr, fprintf, 0);
|
| 428 |
abort(); |
| 429 |
} |
| 430 |
} |