469 lines
14 KiB
C
469 lines
14 KiB
C
/*
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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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#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 "qemu-common.h"
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#include "sysemu.h"
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#include "gdbstub.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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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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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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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) \
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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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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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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));
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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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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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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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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));
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if (s2)
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unlock_user(s2, ARG(2), 0);
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if (s)
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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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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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ret = set_swi_errno(ts, system(s));
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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_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(VERIFY_WRITE, ARG(0), len, 0);
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if (!cmdline_buffer)
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/* FIXME - should this error code be -TARGET_EFAULT ? */
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return (uint32_t)-1;
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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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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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/* Unlock the buffer on the ARM side. */
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unlock_user(cmdline_buffer, ARG(0), len);
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/* Adjust the commandline length argument. */
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SET_ARG(1, len);
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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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#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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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. */
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for (;;) {
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ret = do_brk(limit);
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if (ret != -1)
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break;
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limit = (ts->heap_base >> 1) + (limit >> 1);
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}
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ts->heap_limit = limit;
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}
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if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 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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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);
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#else
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limit = ram_size;
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if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 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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/* TODO: Make this use the limit of the loaded application. */
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ptr[0] = tswap32(limit / 2);
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ptr[1] = tswap32(limit);
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ptr[2] = tswap32(limit); /* Stack base */
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ptr[3] = tswap32(0); /* Stack limit. */
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unlock_user(ptr, ARG(0), 16);
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#endif
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return 0;
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}
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case SYS_EXIT:
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exit(0);
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default:
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fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
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cpu_dump_state(env, stderr, fprintf, 0);
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abort();
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}
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}
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