diff options
Diffstat (limited to 'target-arm')
| -rw-r--r-- | target-arm/Makefile.objs | 1 | ||||
| -rw-r--r-- | target-arm/arm-semi.c | 509 |
2 files changed, 510 insertions, 0 deletions
diff --git a/target-arm/Makefile.objs b/target-arm/Makefile.objs new file mode 100644 index 0000000000..f5bb920266 --- /dev/null +++ b/target-arm/Makefile.objs @@ -0,0 +1 @@ +obj-y += arm-semi.o diff --git a/target-arm/arm-semi.c b/target-arm/arm-semi.c new file mode 100644 index 0000000000..88ca9bb1b7 --- /dev/null +++ b/target-arm/arm-semi.c @@ -0,0 +1,509 @@ +/* + * 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 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 "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(CPUARMState *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 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(CPUARMState *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(CPUARMState *env) +{ + target_ulong args; + char * s; + int nr; + uint32_t ret; + uint32_t len; +#ifdef CONFIG_USER_ONLY + TaskState *ts = env->opaque; +#else + CPUARMState *ts = env; +#endif + + nr = env->regs[0]; + args = env->regs[1]; + switch (nr) { + case TARGET_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 TARGET_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 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: + 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 TARGET_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 TARGET_SYS_READC: + /* XXX: Read from debug cosole. Not implemented. */ + return 0; + case TARGET_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 TARGET_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 TARGET_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 TARGET_SYS_TMPNAM: + /* XXX: Not implemented. */ + return -1; + case TARGET_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 TARGET_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 TARGET_SYS_CLOCK: + return clock() / (CLOCKS_PER_SEC / 100); + case TARGET_SYS_TIME: + return set_swi_errno(ts, time(NULL)); + case TARGET_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 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: + * * 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 TARGET_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 TARGET_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(); + } +} |