657 lines
20 KiB
C
657 lines
20 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 "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/semihost.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 "exec/gdbstub.h"
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#include "hw/arm/arm.h"
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#include "qemu/cutils.h"
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#endif
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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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#define TARGET_SYS_SYNCCACHE 0x19
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/* ADP_Stopped_ApplicationExit is used for exit(0),
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* anything else is implemented as exit(1) */
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#define ADP_Stopped_ApplicationExit (0x20026)
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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(CPUARMState *env, uint32_t code)
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{
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return code;
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}
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#include "exec/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 *cs, target_ulong ret, target_ulong err)
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{
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ARMCPU *cpu = ARM_CPU(cs);
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CPUARMState *env = &cpu->env;
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#ifdef CONFIG_USER_ONLY
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TaskState *ts = cs->opaque;
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#endif
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target_ulong reg0 = is_a64(env) ? env->xregs[0] : env->regs[0];
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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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reg0 = ret;
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} else {
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/* Fixup syscalls that use nonstardard return conventions. */
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switch (reg0) {
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case TARGET_SYS_WRITE:
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case TARGET_SYS_READ:
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reg0 = arm_semi_syscall_len - ret;
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break;
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case TARGET_SYS_SEEK:
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reg0 = 0;
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break;
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default:
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reg0 = ret;
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break;
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}
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}
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if (is_a64(env)) {
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env->xregs[0] = reg0;
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} else {
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env->regs[0] = reg0;
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}
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}
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static target_ulong arm_flen_buf(ARMCPU *cpu)
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{
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/* Return an address in target memory of 64 bytes where the remote
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* gdb should write its stat struct. (The format of this structure
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* is defined by GDB's remote protocol and is not target-specific.)
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* We put this on the guest's stack just below SP.
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*/
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CPUARMState *env = &cpu->env;
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target_ulong sp;
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if (is_a64(env)) {
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sp = env->xregs[31];
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} else {
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sp = env->regs[13];
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}
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return sp - 64;
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}
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static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
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{
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ARMCPU *cpu = ARM_CPU(cs);
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CPUARMState *env = &cpu->env;
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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(cs, arm_flen_buf(cpu) + 32, (uint8_t *)&size, 4, 0);
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size = be32_to_cpu(size);
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if (is_a64(env)) {
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env->xregs[0] = size;
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} else {
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env->regs[0] = size;
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}
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#ifdef CONFIG_USER_ONLY
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((TaskState *)cs->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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static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
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const char *fmt, ...)
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{
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va_list va;
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CPUARMState *env = &cpu->env;
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va_start(va, fmt);
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gdb_do_syscallv(cb, fmt, va);
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va_end(va);
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/* FIXME: we are implicitly relying on the syscall completing
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* before this point, which is not guaranteed. We should
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* put in an explicit synchronization between this and
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* the callback function.
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*/
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return is_a64(env) ? env->xregs[0] : env->regs[0];
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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 (is_a64(env)) { \
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if (get_user_u64(arg ## n, args + (n) * 8)) { \
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return -1; \
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} \
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} else { \
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if (get_user_u32(arg ## n, args + (n) * 4)) { \
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return -1; \
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} \
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} \
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} while (0)
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#define SET_ARG(n, val) \
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(is_a64(env) ? \
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put_user_u64(val, args + (n) * 8) : \
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put_user_u32(val, args + (n) * 4))
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target_ulong do_arm_semihosting(CPUARMState *env)
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{
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ARMCPU *cpu = arm_env_get_cpu(env);
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CPUState *cs = CPU(cpu);
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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 = cs->opaque;
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#else
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CPUARMState *ts = env;
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#endif
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if (is_a64(env)) {
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/* Note that the syscall number is in W0, not X0 */
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nr = env->xregs[0] & 0xffffffffU;
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args = env->xregs[1];
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} else {
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nr = env->regs[0];
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args = env->regs[1];
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}
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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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ret = arm_gdb_syscall(cpu, arm_semi_cb, "open,%s,%x,1a4", arg0,
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(int)arg2+1, gdb_open_modeflags[arg1]);
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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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return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", arg0);
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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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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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return arm_gdb_syscall(cpu, arm_semi_cb, "write,2,%x,1", args);
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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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return arm_gdb_syscall(cpu, arm_semi_cb, "write,2,%x,%x",
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args, len);
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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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return arm_gdb_syscall(cpu, arm_semi_cb, "write,%x,%x,%x",
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arg0, arg1, len);
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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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return arm_gdb_syscall(cpu, arm_semi_cb, "read,%x,%x,%x",
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arg0, arg1, len);
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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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return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", arg0);
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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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return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0",
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arg0, arg1);
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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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return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x",
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arg0, arm_flen_buf(cpu));
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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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ret = arm_gdb_syscall(cpu, arm_semi_cb, "unlink,%s",
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arg0, (int)arg1+1);
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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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return arm_gdb_syscall(cpu, arm_semi_cb, "rename,%s,%s",
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arg0, (int)arg1+1, arg2, (int)arg3+1);
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} else {
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char *s2;
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s = lock_user_string(arg0);
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s2 = lock_user_string(arg2);
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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, 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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}
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case TARGET_SYS_CLOCK:
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return clock() / (CLOCKS_PER_SEC / 100);
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case TARGET_SYS_TIME:
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return set_swi_errno(ts, time(NULL));
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case TARGET_SYS_SYSTEM:
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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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return arm_gdb_syscall(cpu, arm_semi_cb, "system,%s",
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arg0, (int)arg1+1);
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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, system(s));
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unlock_user(s, arg0, 0);
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return ret;
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}
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case TARGET_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 TARGET_SYS_GET_CMDLINE:
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{
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/* Build a command-line from the original argv.
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*
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* The inputs are:
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* * arg0, pointer to a buffer of at least the size
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* specified in arg1.
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* * arg1, size of the buffer pointed to by arg0 in
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* bytes.
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*
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* The outputs are:
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|
* * arg0, pointer to null-terminated string of the
|
|
* command line.
|
|
* * arg1, length of the string pointed to by arg0.
|
|
*/
|
|
|
|
char *output_buffer;
|
|
size_t input_size;
|
|
size_t output_size;
|
|
int status = 0;
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
const char *cmdline;
|
|
#endif
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
input_size = arg1;
|
|
/* Compute the size of the output string. */
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
cmdline = semihosting_get_cmdline();
|
|
if (cmdline == NULL) {
|
|
cmdline = ""; /* Default to an empty line. */
|
|
}
|
|
output_size = strlen(cmdline) + 1; /* Count terminating 0. */
|
|
#else
|
|
unsigned int i;
|
|
|
|
output_size = ts->info->arg_end - ts->info->arg_start;
|
|
if (!output_size) {
|
|
/* We special-case the "empty command line" case (argc==0).
|
|
Just provide the terminating 0. */
|
|
output_size = 1;
|
|
}
|
|
#endif
|
|
|
|
if (output_size > input_size) {
|
|
/* Not enough space to store command-line arguments. */
|
|
return -1;
|
|
}
|
|
|
|
/* Adjust the command-line length. */
|
|
if (SET_ARG(1, output_size - 1)) {
|
|
/* Couldn't write back to argument block */
|
|
return -1;
|
|
}
|
|
|
|
/* Lock the buffer on the ARM side. */
|
|
output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
|
|
if (!output_buffer) {
|
|
return -1;
|
|
}
|
|
|
|
/* Copy the command-line arguments. */
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
pstrcpy(output_buffer, output_size, cmdline);
|
|
#else
|
|
if (output_size == 1) {
|
|
/* Empty command-line. */
|
|
output_buffer[0] = '\0';
|
|
goto out;
|
|
}
|
|
|
|
if (copy_from_user(output_buffer, ts->info->arg_start,
|
|
output_size)) {
|
|
status = -1;
|
|
goto out;
|
|
}
|
|
|
|
/* Separate arguments by white spaces. */
|
|
for (i = 0; i < output_size - 1; i++) {
|
|
if (output_buffer[i] == 0) {
|
|
output_buffer[i] = ' ';
|
|
}
|
|
}
|
|
out:
|
|
#endif
|
|
/* Unlock the buffer on the ARM side. */
|
|
unlock_user(output_buffer, arg0, output_size);
|
|
|
|
return status;
|
|
}
|
|
case TARGET_SYS_HEAPINFO:
|
|
{
|
|
target_ulong retvals[4];
|
|
target_ulong limit;
|
|
int i;
|
|
|
|
GET_ARG(0);
|
|
|
|
#ifdef CONFIG_USER_ONLY
|
|
/* Some C libraries assume the heap immediately follows .bss, so
|
|
allocate it using sbrk. */
|
|
if (!ts->heap_limit) {
|
|
abi_ulong ret;
|
|
|
|
ts->heap_base = do_brk(0);
|
|
limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
|
|
/* Try a big heap, and reduce the size if that fails. */
|
|
for (;;) {
|
|
ret = do_brk(limit);
|
|
if (ret >= limit) {
|
|
break;
|
|
}
|
|
limit = (ts->heap_base >> 1) + (limit >> 1);
|
|
}
|
|
ts->heap_limit = limit;
|
|
}
|
|
|
|
retvals[0] = ts->heap_base;
|
|
retvals[1] = ts->heap_limit;
|
|
retvals[2] = ts->stack_base;
|
|
retvals[3] = 0; /* Stack limit. */
|
|
#else
|
|
limit = ram_size;
|
|
/* TODO: Make this use the limit of the loaded application. */
|
|
retvals[0] = limit / 2;
|
|
retvals[1] = limit;
|
|
retvals[2] = limit; /* Stack base */
|
|
retvals[3] = 0; /* Stack limit. */
|
|
#endif
|
|
|
|
for (i = 0; i < ARRAY_SIZE(retvals); i++) {
|
|
bool fail;
|
|
|
|
if (is_a64(env)) {
|
|
fail = put_user_u64(retvals[i], arg0 + i * 8);
|
|
} else {
|
|
fail = put_user_u32(retvals[i], arg0 + i * 4);
|
|
}
|
|
|
|
if (fail) {
|
|
/* Couldn't write back to argument block */
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
case TARGET_SYS_EXIT:
|
|
if (is_a64(env)) {
|
|
/* The A64 version of this call takes a parameter block,
|
|
* so the application-exit type can return a subcode which
|
|
* is the exit status code from the application.
|
|
*/
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
|
|
if (arg0 == ADP_Stopped_ApplicationExit) {
|
|
ret = arg1;
|
|
} else {
|
|
ret = 1;
|
|
}
|
|
} else {
|
|
/* ARM specifies only Stopped_ApplicationExit as normal
|
|
* exit, everything else is considered an error */
|
|
ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
|
|
}
|
|
gdb_exit(env, ret);
|
|
exit(ret);
|
|
case TARGET_SYS_SYNCCACHE:
|
|
/* Clean the D-cache and invalidate the I-cache for the specified
|
|
* virtual address range. This is a nop for us since we don't
|
|
* implement caches. This is only present on A64.
|
|
*/
|
|
if (is_a64(env)) {
|
|
return 0;
|
|
}
|
|
/* fall through -- invalid for A32/T32 */
|
|
default:
|
|
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
|
|
cpu_dump_state(cs, stderr, fprintf, 0);
|
|
abort();
|
|
}
|
|
}
|