| /* |
| * 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 "gdbstub.h" |
| #include "hw/arm-misc.h" |
| #endif |
| |
| #define SYS_OPEN 0x01 |
| #define SYS_CLOSE 0x02 |
| #define SYS_WRITEC 0x03 |
| #define SYS_WRITE0 0x04 |
| #define SYS_WRITE 0x05 |
| #define SYS_READ 0x06 |
| #define SYS_READC 0x07 |
| #define SYS_ISTTY 0x09 |
| #define SYS_SEEK 0x0a |
| #define SYS_FLEN 0x0c |
| #define SYS_TMPNAM 0x0d |
| #define SYS_REMOVE 0x0e |
| #define SYS_RENAME 0x0f |
| #define SYS_CLOCK 0x10 |
| #define SYS_TIME 0x11 |
| #define SYS_SYSTEM 0x12 |
| #define SYS_ERRNO 0x13 |
| #define SYS_GET_CMDLINE 0x15 |
| #define SYS_HEAPINFO 0x16 |
| #define 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(CPUState *env, uint32_t code) |
| { |
| return code; |
| } |
| |
| #include "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 *env, target_ulong ret, target_ulong err) |
| { |
| #ifdef CONFIG_USER_ONLY |
| TaskState *ts = env->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 SYS_WRITE: |
| case SYS_READ: |
| env->regs[0] = arm_semi_syscall_len - ret; |
| break; |
| case SYS_SEEK: |
| env->regs[0] = 0; |
| break; |
| default: |
| env->regs[0] = ret; |
| break; |
| } |
| } |
| } |
| |
| static void arm_semi_flen_cb(CPUState *env, target_ulong ret, target_ulong err) |
| { |
| /* 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(env, env->regs[13]-64+32, (uint8_t *)&size, 4, 0); |
| env->regs[0] = be32_to_cpu(size); |
| #ifdef CONFIG_USER_ONLY |
| ((TaskState *)env->opaque)->swi_errno = err; |
| #else |
| syscall_err = err; |
| #endif |
| } |
| |
| #define ARG(n) \ |
| ({ \ |
| target_ulong __arg; \ |
| /* FIXME - handle get_user() failure */ \ |
| get_user_ual(__arg, args + (n) * 4); \ |
| __arg; \ |
| }) |
| #define SET_ARG(n, val) put_user_ual(val, args + (n) * 4) |
| uint32_t do_arm_semihosting(CPUState *env) |
| { |
| target_ulong args; |
| char * s; |
| int nr; |
| uint32_t ret; |
| uint32_t len; |
| #ifdef CONFIG_USER_ONLY |
| TaskState *ts = env->opaque; |
| #else |
| CPUState *ts = env; |
| #endif |
| |
| nr = env->regs[0]; |
| args = env->regs[1]; |
| switch (nr) { |
| case SYS_OPEN: |
| if (!(s = lock_user_string(ARG(0)))) |
| /* FIXME - should this error code be -TARGET_EFAULT ? */ |
| return (uint32_t)-1; |
| if (ARG(1) >= 12) |
| return (uint32_t)-1; |
| if (strcmp(s, ":tt") == 0) { |
| if (ARG(1) < 4) |
| return STDIN_FILENO; |
| else |
| return STDOUT_FILENO; |
| } |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", ARG(0), |
| (int)ARG(2)+1, gdb_open_modeflags[ARG(1)]); |
| return env->regs[0]; |
| } else { |
| ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644)); |
| } |
| unlock_user(s, ARG(0), 0); |
| return ret; |
| case SYS_CLOSE: |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(arm_semi_cb, "close,%x", ARG(0)); |
| return env->regs[0]; |
| } else { |
| return set_swi_errno(ts, close(ARG(0))); |
| } |
| case 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 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 SYS_WRITE: |
| len = ARG(2); |
| if (use_gdb_syscalls()) { |
| arm_semi_syscall_len = len; |
| gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len); |
| return env->regs[0]; |
| } else { |
| if (!(s = lock_user(VERIFY_READ, ARG(1), len, 1))) |
| /* FIXME - should this error code be -TARGET_EFAULT ? */ |
| return (uint32_t)-1; |
| ret = set_swi_errno(ts, write(ARG(0), s, len)); |
| unlock_user(s, ARG(1), 0); |
| if (ret == (uint32_t)-1) |
| return -1; |
| return len - ret; |
| } |
| case SYS_READ: |
| len = ARG(2); |
| if (use_gdb_syscalls()) { |
| arm_semi_syscall_len = len; |
| gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len); |
| return env->regs[0]; |
| } else { |
| if (!(s = lock_user(VERIFY_WRITE, ARG(1), len, 0))) |
| /* FIXME - should this error code be -TARGET_EFAULT ? */ |
| return (uint32_t)-1; |
| do |
| ret = set_swi_errno(ts, read(ARG(0), s, len)); |
| while (ret == -1 && errno == EINTR); |
| unlock_user(s, ARG(1), len); |
| if (ret == (uint32_t)-1) |
| return -1; |
| return len - ret; |
| } |
| case SYS_READC: |
| /* XXX: Read from debug cosole. Not implemented. */ |
| return 0; |
| case SYS_ISTTY: |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(arm_semi_cb, "isatty,%x", ARG(0)); |
| return env->regs[0]; |
| } else { |
| return isatty(ARG(0)); |
| } |
| case SYS_SEEK: |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", ARG(0), ARG(1)); |
| return env->regs[0]; |
| } else { |
| ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET)); |
| if (ret == (uint32_t)-1) |
| return -1; |
| return 0; |
| } |
| case SYS_FLEN: |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x", |
| ARG(0), env->regs[13]-64); |
| return env->regs[0]; |
| } else { |
| struct stat buf; |
| ret = set_swi_errno(ts, fstat(ARG(0), &buf)); |
| if (ret == (uint32_t)-1) |
| return -1; |
| return buf.st_size; |
| } |
| case SYS_TMPNAM: |
| /* XXX: Not implemented. */ |
| return -1; |
| case SYS_REMOVE: |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(arm_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)+1); |
| ret = env->regs[0]; |
| } else { |
| if (!(s = lock_user_string(ARG(0)))) |
| /* FIXME - should this error code be -TARGET_EFAULT ? */ |
| return (uint32_t)-1; |
| ret = set_swi_errno(ts, remove(s)); |
| unlock_user(s, ARG(0), 0); |
| } |
| return ret; |
| case SYS_RENAME: |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(arm_semi_cb, "rename,%s,%s", |
| ARG(0), (int)ARG(1)+1, ARG(2), (int)ARG(3)+1); |
| return env->regs[0]; |
| } else { |
| char *s2; |
| s = lock_user_string(ARG(0)); |
| s2 = lock_user_string(ARG(2)); |
| 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, ARG(2), 0); |
| if (s) |
| unlock_user(s, ARG(0), 0); |
| return ret; |
| } |
| case SYS_CLOCK: |
| return clock() / (CLOCKS_PER_SEC / 100); |
| case SYS_TIME: |
| return set_swi_errno(ts, time(NULL)); |
| case SYS_SYSTEM: |
| if (use_gdb_syscalls()) { |
| gdb_do_syscall(arm_semi_cb, "system,%s", ARG(0), (int)ARG(1)+1); |
| return env->regs[0]; |
| } else { |
| if (!(s = lock_user_string(ARG(0)))) |
| /* FIXME - should this error code be -TARGET_EFAULT ? */ |
| return (uint32_t)-1; |
| ret = set_swi_errno(ts, system(s)); |
| unlock_user(s, ARG(0), 0); |
| return ret; |
| } |
| case SYS_ERRNO: |
| #ifdef CONFIG_USER_ONLY |
| return ts->swi_errno; |
| #else |
| return syscall_err; |
| #endif |
| case SYS_GET_CMDLINE: |
| { |
| /* Build a command-line from the original argv. |
| * |
| * The inputs are: |
| * * ARG(0), pointer to a buffer of at least the size |
| * specified in ARG(1). |
| * * ARG(1), size of the buffer pointed to by ARG(0) in |
| * bytes. |
| * |
| * The outputs are: |
| * * ARG(0), pointer to null-terminated string of the |
| * command line. |
| * * ARG(1), length of the string pointed to by ARG(0). |
| */ |
| |
| char *output_buffer; |
| size_t input_size = ARG(1); |
| size_t output_size; |
| int status = 0; |
| |
| /* 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. */ |
| SET_ARG(1, output_size - 1); |
| |
| /* Lock the buffer on the ARM side. */ |
| output_buffer = lock_user(VERIFY_WRITE, ARG(0), 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, ARG(0), output_size); |
| |
| return status; |
| } |
| case SYS_HEAPINFO: |
| { |
| uint32_t *ptr; |
| uint32_t limit; |
| |
| #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; |
| } |
| |
| if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0))) |
| /* 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, ARG(0), 16); |
| #else |
| limit = ram_size; |
| if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0))) |
| /* 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, ARG(0), 16); |
| #endif |
| return 0; |
| } |
| case SYS_EXIT: |
| gdb_exit(env, 0); |
| exit(0); |
| default: |
| fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr); |
| cpu_dump_state(env, stderr, fprintf, 0); |
| abort(); |
| } |
| } |
