562 lines
17 KiB
C
562 lines
17 KiB
C
/*
|
|
* Arm "Angel" semihosting syscalls
|
|
*
|
|
* Copyright (c) 2005, 2007 CodeSourcery.
|
|
* Written by Paul Brook.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <time.h>
|
|
|
|
#include "cpu.h"
|
|
#ifdef CONFIG_USER_ONLY
|
|
#include "qemu.h"
|
|
|
|
#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
|
|
#else
|
|
#include "qemu-common.h"
|
|
#include "exec/gdbstub.h"
|
|
#include "hw/arm/arm.h"
|
|
#endif
|
|
|
|
#define TARGET_SYS_OPEN 0x01
|
|
#define TARGET_SYS_CLOSE 0x02
|
|
#define TARGET_SYS_WRITEC 0x03
|
|
#define TARGET_SYS_WRITE0 0x04
|
|
#define TARGET_SYS_WRITE 0x05
|
|
#define TARGET_SYS_READ 0x06
|
|
#define TARGET_SYS_READC 0x07
|
|
#define TARGET_SYS_ISTTY 0x09
|
|
#define TARGET_SYS_SEEK 0x0a
|
|
#define TARGET_SYS_FLEN 0x0c
|
|
#define TARGET_SYS_TMPNAM 0x0d
|
|
#define TARGET_SYS_REMOVE 0x0e
|
|
#define TARGET_SYS_RENAME 0x0f
|
|
#define TARGET_SYS_CLOCK 0x10
|
|
#define TARGET_SYS_TIME 0x11
|
|
#define TARGET_SYS_SYSTEM 0x12
|
|
#define TARGET_SYS_ERRNO 0x13
|
|
#define TARGET_SYS_GET_CMDLINE 0x15
|
|
#define TARGET_SYS_HEAPINFO 0x16
|
|
#define TARGET_SYS_EXIT 0x18
|
|
|
|
#ifndef O_BINARY
|
|
#define O_BINARY 0
|
|
#endif
|
|
|
|
#define GDB_O_RDONLY 0x000
|
|
#define GDB_O_WRONLY 0x001
|
|
#define GDB_O_RDWR 0x002
|
|
#define GDB_O_APPEND 0x008
|
|
#define GDB_O_CREAT 0x200
|
|
#define GDB_O_TRUNC 0x400
|
|
#define GDB_O_BINARY 0
|
|
|
|
static int gdb_open_modeflags[12] = {
|
|
GDB_O_RDONLY,
|
|
GDB_O_RDONLY | GDB_O_BINARY,
|
|
GDB_O_RDWR,
|
|
GDB_O_RDWR | GDB_O_BINARY,
|
|
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
|
|
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
|
|
GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
|
|
GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
|
|
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
|
|
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY,
|
|
GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
|
|
GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY
|
|
};
|
|
|
|
static int open_modeflags[12] = {
|
|
O_RDONLY,
|
|
O_RDONLY | O_BINARY,
|
|
O_RDWR,
|
|
O_RDWR | O_BINARY,
|
|
O_WRONLY | O_CREAT | O_TRUNC,
|
|
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
|
|
O_RDWR | O_CREAT | O_TRUNC,
|
|
O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
|
|
O_WRONLY | O_CREAT | O_APPEND,
|
|
O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
|
|
O_RDWR | O_CREAT | O_APPEND,
|
|
O_RDWR | O_CREAT | O_APPEND | O_BINARY
|
|
};
|
|
|
|
#ifdef CONFIG_USER_ONLY
|
|
static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
|
|
{
|
|
if (code == (uint32_t)-1)
|
|
ts->swi_errno = errno;
|
|
return code;
|
|
}
|
|
#else
|
|
static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
|
|
{
|
|
return code;
|
|
}
|
|
|
|
#include "exec/softmmu-semi.h"
|
|
#endif
|
|
|
|
static target_ulong arm_semi_syscall_len;
|
|
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
static target_ulong syscall_err;
|
|
#endif
|
|
|
|
static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
|
|
{
|
|
ARMCPU *cpu = ARM_CPU(cs);
|
|
CPUARMState *env = &cpu->env;
|
|
#ifdef CONFIG_USER_ONLY
|
|
TaskState *ts = cs->opaque;
|
|
#endif
|
|
|
|
if (ret == (target_ulong)-1) {
|
|
#ifdef CONFIG_USER_ONLY
|
|
ts->swi_errno = err;
|
|
#else
|
|
syscall_err = err;
|
|
#endif
|
|
env->regs[0] = ret;
|
|
} else {
|
|
/* Fixup syscalls that use nonstardard return conventions. */
|
|
switch (env->regs[0]) {
|
|
case TARGET_SYS_WRITE:
|
|
case TARGET_SYS_READ:
|
|
env->regs[0] = arm_semi_syscall_len - ret;
|
|
break;
|
|
case TARGET_SYS_SEEK:
|
|
env->regs[0] = 0;
|
|
break;
|
|
default:
|
|
env->regs[0] = ret;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
|
|
{
|
|
ARMCPU *cpu = ARM_CPU(cs);
|
|
CPUARMState *env = &cpu->env;
|
|
/* The size is always stored in big-endian order, extract
|
|
the value. We assume the size always fit in 32 bits. */
|
|
uint32_t size;
|
|
cpu_memory_rw_debug(cs, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
|
|
env->regs[0] = be32_to_cpu(size);
|
|
#ifdef CONFIG_USER_ONLY
|
|
((TaskState *)cs->opaque)->swi_errno = err;
|
|
#else
|
|
syscall_err = err;
|
|
#endif
|
|
}
|
|
|
|
/* Read the input value from the argument block; fail the semihosting
|
|
* call if the memory read fails.
|
|
*/
|
|
#define GET_ARG(n) do { \
|
|
if (get_user_ual(arg ## n, args + (n) * 4)) { \
|
|
return (uint32_t)-1; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define SET_ARG(n, val) put_user_ual(val, args + (n) * 4)
|
|
uint32_t do_arm_semihosting(CPUARMState *env)
|
|
{
|
|
ARMCPU *cpu = arm_env_get_cpu(env);
|
|
CPUState *cs = CPU(cpu);
|
|
target_ulong args;
|
|
target_ulong arg0, arg1, arg2, arg3;
|
|
char * s;
|
|
int nr;
|
|
uint32_t ret;
|
|
uint32_t len;
|
|
#ifdef CONFIG_USER_ONLY
|
|
TaskState *ts = cs->opaque;
|
|
#else
|
|
CPUARMState *ts = env;
|
|
#endif
|
|
|
|
nr = env->regs[0];
|
|
args = env->regs[1];
|
|
switch (nr) {
|
|
case TARGET_SYS_OPEN:
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
GET_ARG(2);
|
|
s = lock_user_string(arg0);
|
|
if (!s) {
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
return (uint32_t)-1;
|
|
}
|
|
if (arg1 >= 12) {
|
|
unlock_user(s, arg0, 0);
|
|
return (uint32_t)-1;
|
|
}
|
|
if (strcmp(s, ":tt") == 0) {
|
|
int result_fileno = arg1 < 4 ? STDIN_FILENO : STDOUT_FILENO;
|
|
unlock_user(s, arg0, 0);
|
|
return result_fileno;
|
|
}
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", arg0,
|
|
(int)arg2+1, gdb_open_modeflags[arg1]);
|
|
ret = env->regs[0];
|
|
} else {
|
|
ret = set_swi_errno(ts, open(s, open_modeflags[arg1], 0644));
|
|
}
|
|
unlock_user(s, arg0, 0);
|
|
return ret;
|
|
case TARGET_SYS_CLOSE:
|
|
GET_ARG(0);
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_cb, "close,%x", arg0);
|
|
return env->regs[0];
|
|
} else {
|
|
return set_swi_errno(ts, close(arg0));
|
|
}
|
|
case TARGET_SYS_WRITEC:
|
|
{
|
|
char c;
|
|
|
|
if (get_user_u8(c, args))
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
return (uint32_t)-1;
|
|
/* Write to debug console. stderr is near enough. */
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
|
|
return env->regs[0];
|
|
} else {
|
|
return write(STDERR_FILENO, &c, 1);
|
|
}
|
|
}
|
|
case TARGET_SYS_WRITE0:
|
|
if (!(s = lock_user_string(args)))
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
return (uint32_t)-1;
|
|
len = strlen(s);
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
|
|
ret = env->regs[0];
|
|
} else {
|
|
ret = write(STDERR_FILENO, s, len);
|
|
}
|
|
unlock_user(s, args, 0);
|
|
return ret;
|
|
case TARGET_SYS_WRITE:
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
GET_ARG(2);
|
|
len = arg2;
|
|
if (use_gdb_syscalls()) {
|
|
arm_semi_syscall_len = len;
|
|
gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", arg0, arg1, len);
|
|
return env->regs[0];
|
|
} else {
|
|
s = lock_user(VERIFY_READ, arg1, len, 1);
|
|
if (!s) {
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
return (uint32_t)-1;
|
|
}
|
|
ret = set_swi_errno(ts, write(arg0, s, len));
|
|
unlock_user(s, arg1, 0);
|
|
if (ret == (uint32_t)-1)
|
|
return -1;
|
|
return len - ret;
|
|
}
|
|
case TARGET_SYS_READ:
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
GET_ARG(2);
|
|
len = arg2;
|
|
if (use_gdb_syscalls()) {
|
|
arm_semi_syscall_len = len;
|
|
gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", arg0, arg1, len);
|
|
return env->regs[0];
|
|
} else {
|
|
s = lock_user(VERIFY_WRITE, arg1, len, 0);
|
|
if (!s) {
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
return (uint32_t)-1;
|
|
}
|
|
do {
|
|
ret = set_swi_errno(ts, read(arg0, s, len));
|
|
} while (ret == -1 && errno == EINTR);
|
|
unlock_user(s, arg1, len);
|
|
if (ret == (uint32_t)-1)
|
|
return -1;
|
|
return len - ret;
|
|
}
|
|
case TARGET_SYS_READC:
|
|
/* XXX: Read from debug console. Not implemented. */
|
|
return 0;
|
|
case TARGET_SYS_ISTTY:
|
|
GET_ARG(0);
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_cb, "isatty,%x", arg0);
|
|
return env->regs[0];
|
|
} else {
|
|
return isatty(arg0);
|
|
}
|
|
case TARGET_SYS_SEEK:
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", arg0, arg1);
|
|
return env->regs[0];
|
|
} else {
|
|
ret = set_swi_errno(ts, lseek(arg0, arg1, SEEK_SET));
|
|
if (ret == (uint32_t)-1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
case TARGET_SYS_FLEN:
|
|
GET_ARG(0);
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
|
|
arg0, env->regs[13]-64);
|
|
return env->regs[0];
|
|
} else {
|
|
struct stat buf;
|
|
ret = set_swi_errno(ts, fstat(arg0, &buf));
|
|
if (ret == (uint32_t)-1)
|
|
return -1;
|
|
return buf.st_size;
|
|
}
|
|
case TARGET_SYS_TMPNAM:
|
|
/* XXX: Not implemented. */
|
|
return -1;
|
|
case TARGET_SYS_REMOVE:
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_cb, "unlink,%s", arg0, (int)arg1+1);
|
|
ret = env->regs[0];
|
|
} else {
|
|
s = lock_user_string(arg0);
|
|
if (!s) {
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
return (uint32_t)-1;
|
|
}
|
|
ret = set_swi_errno(ts, remove(s));
|
|
unlock_user(s, arg0, 0);
|
|
}
|
|
return ret;
|
|
case TARGET_SYS_RENAME:
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
GET_ARG(2);
|
|
GET_ARG(3);
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
|
|
arg0, (int)arg1+1, arg2, (int)arg3+1);
|
|
return env->regs[0];
|
|
} else {
|
|
char *s2;
|
|
s = lock_user_string(arg0);
|
|
s2 = lock_user_string(arg2);
|
|
if (!s || !s2)
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
ret = (uint32_t)-1;
|
|
else
|
|
ret = set_swi_errno(ts, rename(s, s2));
|
|
if (s2)
|
|
unlock_user(s2, arg2, 0);
|
|
if (s)
|
|
unlock_user(s, arg0, 0);
|
|
return ret;
|
|
}
|
|
case TARGET_SYS_CLOCK:
|
|
return clock() / (CLOCKS_PER_SEC / 100);
|
|
case TARGET_SYS_TIME:
|
|
return set_swi_errno(ts, time(NULL));
|
|
case TARGET_SYS_SYSTEM:
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
if (use_gdb_syscalls()) {
|
|
gdb_do_syscall(arm_semi_cb, "system,%s", arg0, (int)arg1+1);
|
|
return env->regs[0];
|
|
} else {
|
|
s = lock_user_string(arg0);
|
|
if (!s) {
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
return (uint32_t)-1;
|
|
}
|
|
ret = set_swi_errno(ts, system(s));
|
|
unlock_user(s, arg0, 0);
|
|
return ret;
|
|
}
|
|
case TARGET_SYS_ERRNO:
|
|
#ifdef CONFIG_USER_ONLY
|
|
return ts->swi_errno;
|
|
#else
|
|
return syscall_err;
|
|
#endif
|
|
case TARGET_SYS_GET_CMDLINE:
|
|
{
|
|
/* Build a command-line from the original argv.
|
|
*
|
|
* The inputs are:
|
|
* * arg0, pointer to a buffer of at least the size
|
|
* specified in arg1.
|
|
* * arg1, size of the buffer pointed to by arg0 in
|
|
* bytes.
|
|
*
|
|
* The outputs are:
|
|
* * 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;
|
|
GET_ARG(0);
|
|
GET_ARG(1);
|
|
input_size = arg1;
|
|
/* Compute the size of the output string. */
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
output_size = strlen(ts->boot_info->kernel_filename)
|
|
+ 1 /* Separating space. */
|
|
+ strlen(ts->boot_info->kernel_cmdline)
|
|
+ 1; /* Terminating null byte. */
|
|
#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, ts->boot_info->kernel_filename);
|
|
pstrcat(output_buffer, output_size, " ");
|
|
pstrcat(output_buffer, output_size, ts->boot_info->kernel_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:
|
|
{
|
|
uint32_t *ptr;
|
|
uint32_t limit;
|
|
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;
|
|
}
|
|
|
|
ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
|
|
if (!ptr) {
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
return (uint32_t)-1;
|
|
}
|
|
ptr[0] = tswap32(ts->heap_base);
|
|
ptr[1] = tswap32(ts->heap_limit);
|
|
ptr[2] = tswap32(ts->stack_base);
|
|
ptr[3] = tswap32(0); /* Stack limit. */
|
|
unlock_user(ptr, arg0, 16);
|
|
#else
|
|
limit = ram_size;
|
|
ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
|
|
if (!ptr) {
|
|
/* FIXME - should this error code be -TARGET_EFAULT ? */
|
|
return (uint32_t)-1;
|
|
}
|
|
/* TODO: Make this use the limit of the loaded application. */
|
|
ptr[0] = tswap32(limit / 2);
|
|
ptr[1] = tswap32(limit);
|
|
ptr[2] = tswap32(limit); /* Stack base */
|
|
ptr[3] = tswap32(0); /* Stack limit. */
|
|
unlock_user(ptr, arg0, 16);
|
|
#endif
|
|
return 0;
|
|
}
|
|
case TARGET_SYS_EXIT:
|
|
gdb_exit(env, 0);
|
|
exit(0);
|
|
default:
|
|
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
|
|
cpu_dump_state(cs, stderr, fprintf, 0);
|
|
abort();
|
|
}
|
|
}
|