bellard | e88de09 | 2005-02-07 12:35:39 +0000 | [diff] [blame] | 1 | #ifndef QEMU_H |
| 2 | #define QEMU_H |
bellard | 31e31b8 | 2003-02-18 22:55:36 +0000 | [diff] [blame] | 3 | |
Timothy E Baldwin | 4d330ce | 2016-05-12 18:47:46 +0100 | [diff] [blame] | 4 | #include "hostdep.h" |
bellard | 6180a18 | 2003-09-30 21:04:53 +0000 | [diff] [blame] | 5 | #include "cpu.h" |
Paolo Bonzini | 63c9155 | 2016-03-15 13:18:37 +0100 | [diff] [blame] | 6 | #include "exec/exec-all.h" |
Paolo Bonzini | f08b617 | 2014-03-28 19:42:10 +0100 | [diff] [blame] | 7 | #include "exec/cpu_ldst.h" |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 8 | |
balrog | 06177d3 | 2007-12-24 13:47:52 +0000 | [diff] [blame] | 9 | #undef DEBUG_REMAP |
| 10 | #ifdef DEBUG_REMAP |
balrog | 06177d3 | 2007-12-24 13:47:52 +0000 | [diff] [blame] | 11 | #endif /* DEBUG_REMAP */ |
| 12 | |
Paolo Bonzini | 022c62c | 2012-12-17 18:19:49 +0100 | [diff] [blame] | 13 | #include "exec/user/abitypes.h" |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 14 | |
Paolo Bonzini | 022c62c | 2012-12-17 18:19:49 +0100 | [diff] [blame] | 15 | #include "exec/user/thunk.h" |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 16 | #include "syscall_defs.h" |
LluĂs Vilanova | 460c579 | 2016-02-01 19:38:42 +0100 | [diff] [blame] | 17 | #include "target_syscall.h" |
Paolo Bonzini | 022c62c | 2012-12-17 18:19:49 +0100 | [diff] [blame] | 18 | #include "exec/gdbstub.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 19 | #include "qemu/queue.h" |
bellard | 66fb976 | 2003-03-23 01:06:05 +0000 | [diff] [blame] | 20 | |
pbrook | d597536 | 2008-06-07 20:50:51 +0000 | [diff] [blame] | 21 | #define THREAD __thread |
pbrook | d597536 | 2008-06-07 20:50:51 +0000 | [diff] [blame] | 22 | |
Peter Maydell | 1d48fdd | 2016-06-14 12:49:18 +0100 | [diff] [blame] | 23 | /* This is the size of the host kernel's sigset_t, needed where we make |
| 24 | * direct system calls that take a sigset_t pointer and a size. |
| 25 | */ |
| 26 | #define SIGSET_T_SIZE (_NSIG / 8) |
| 27 | |
bellard | 31e31b8 | 2003-02-18 22:55:36 +0000 | [diff] [blame] | 28 | /* This struct is used to hold certain information about the image. |
| 29 | * Basically, it replicates in user space what would be certain |
| 30 | * task_struct fields in the kernel |
| 31 | */ |
| 32 | struct image_info { |
Richard Henderson | 9955ffa | 2010-07-27 10:25:30 -0700 | [diff] [blame] | 33 | abi_ulong load_bias; |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 34 | abi_ulong load_addr; |
| 35 | abi_ulong start_code; |
| 36 | abi_ulong end_code; |
| 37 | abi_ulong start_data; |
| 38 | abi_ulong end_data; |
| 39 | abi_ulong start_brk; |
| 40 | abi_ulong brk; |
| 41 | abi_ulong start_mmap; |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 42 | abi_ulong start_stack; |
Paul Brook | 97374d3 | 2010-06-16 13:03:51 +0100 | [diff] [blame] | 43 | abi_ulong stack_limit; |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 44 | abi_ulong entry; |
| 45 | abi_ulong code_offset; |
| 46 | abi_ulong data_offset; |
Mika Westerberg | edf8e2a | 2009-04-07 09:57:11 +0300 | [diff] [blame] | 47 | abi_ulong saved_auxv; |
Alexander Graf | 125b0f5 | 2012-01-28 21:12:14 +0200 | [diff] [blame] | 48 | abi_ulong auxv_len; |
Mika Westerberg | edf8e2a | 2009-04-07 09:57:11 +0300 | [diff] [blame] | 49 | abi_ulong arg_start; |
| 50 | abi_ulong arg_end; |
Paul Brook | d8fd295 | 2012-03-30 18:02:50 +0100 | [diff] [blame] | 51 | uint32_t elf_flags; |
bellard | 31e31b8 | 2003-02-18 22:55:36 +0000 | [diff] [blame] | 52 | int personality; |
Mike Frysinger | 1af02e8 | 2011-02-07 01:05:50 -0500 | [diff] [blame] | 53 | #ifdef CONFIG_USE_FDPIC |
| 54 | abi_ulong loadmap_addr; |
| 55 | uint16_t nsegs; |
| 56 | void *loadsegs; |
| 57 | abi_ulong pt_dynamic_addr; |
| 58 | struct image_info *other_info; |
| 59 | #endif |
bellard | 31e31b8 | 2003-02-18 22:55:36 +0000 | [diff] [blame] | 60 | }; |
| 61 | |
bellard | b346ff4 | 2003-06-15 20:05:50 +0000 | [diff] [blame] | 62 | #ifdef TARGET_I386 |
bellard | 851e67a | 2003-03-29 16:53:14 +0000 | [diff] [blame] | 63 | /* Information about the current linux thread */ |
| 64 | struct vm86_saved_state { |
| 65 | uint32_t eax; /* return code */ |
| 66 | uint32_t ebx; |
| 67 | uint32_t ecx; |
| 68 | uint32_t edx; |
| 69 | uint32_t esi; |
| 70 | uint32_t edi; |
| 71 | uint32_t ebp; |
| 72 | uint32_t esp; |
| 73 | uint32_t eflags; |
| 74 | uint32_t eip; |
| 75 | uint16_t cs, ss, ds, es, fs, gs; |
| 76 | }; |
bellard | b346ff4 | 2003-06-15 20:05:50 +0000 | [diff] [blame] | 77 | #endif |
bellard | 851e67a | 2003-03-29 16:53:14 +0000 | [diff] [blame] | 78 | |
Peter Maydell | 848d72c | 2013-09-03 20:12:17 +0100 | [diff] [blame] | 79 | #if defined(TARGET_ARM) && defined(TARGET_ABI32) |
bellard | 28c4f36 | 2004-02-16 21:47:43 +0000 | [diff] [blame] | 80 | /* FPU emulator */ |
| 81 | #include "nwfpe/fpa11.h" |
bellard | 28c4f36 | 2004-02-16 21:47:43 +0000 | [diff] [blame] | 82 | #endif |
| 83 | |
pbrook | 624f797 | 2008-05-31 16:11:38 +0000 | [diff] [blame] | 84 | #define MAX_SIGQUEUE_SIZE 1024 |
| 85 | |
pbrook | 624f797 | 2008-05-31 16:11:38 +0000 | [diff] [blame] | 86 | struct emulated_sigtable { |
| 87 | int pending; /* true if signal is pending */ |
Timothy E Baldwin | 907f5fd | 2016-05-27 15:51:52 +0100 | [diff] [blame] | 88 | target_siginfo_t info; |
pbrook | 624f797 | 2008-05-31 16:11:38 +0000 | [diff] [blame] | 89 | }; |
| 90 | |
bellard | 851e67a | 2003-03-29 16:53:14 +0000 | [diff] [blame] | 91 | /* NOTE: we force a big alignment so that the stack stored after is |
| 92 | aligned too */ |
| 93 | typedef struct TaskState { |
Mika Westerberg | edf8e2a | 2009-04-07 09:57:11 +0300 | [diff] [blame] | 94 | pid_t ts_tid; /* tid (or pid) of this task */ |
bellard | 28c4f36 | 2004-02-16 21:47:43 +0000 | [diff] [blame] | 95 | #ifdef TARGET_ARM |
Peter Maydell | 848d72c | 2013-09-03 20:12:17 +0100 | [diff] [blame] | 96 | # ifdef TARGET_ABI32 |
bellard | 28c4f36 | 2004-02-16 21:47:43 +0000 | [diff] [blame] | 97 | /* FPA state */ |
| 98 | FPA11 fpa; |
Peter Maydell | 848d72c | 2013-09-03 20:12:17 +0100 | [diff] [blame] | 99 | # endif |
bellard | a4f8197 | 2005-04-23 18:25:41 +0000 | [diff] [blame] | 100 | int swi_errno; |
bellard | 28c4f36 | 2004-02-16 21:47:43 +0000 | [diff] [blame] | 101 | #endif |
Guan Xuetao | d2fbca9 | 2011-04-12 16:27:03 +0800 | [diff] [blame] | 102 | #ifdef TARGET_UNICORE32 |
| 103 | int swi_errno; |
| 104 | #endif |
j_mayer | 84409dd | 2007-04-06 08:56:50 +0000 | [diff] [blame] | 105 | #if defined(TARGET_I386) && !defined(TARGET_X86_64) |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 106 | abi_ulong target_v86; |
bellard | 851e67a | 2003-03-29 16:53:14 +0000 | [diff] [blame] | 107 | struct vm86_saved_state vm86_saved_regs; |
bellard | b333af0 | 2003-05-14 21:48:51 +0000 | [diff] [blame] | 108 | struct target_vm86plus_struct vm86plus; |
bellard | 631271d | 2003-05-10 13:14:52 +0000 | [diff] [blame] | 109 | uint32_t v86flags; |
| 110 | uint32_t v86mask; |
bellard | b346ff4 | 2003-06-15 20:05:50 +0000 | [diff] [blame] | 111 | #endif |
pbrook | c276471 | 2009-03-07 15:24:59 +0000 | [diff] [blame] | 112 | abi_ulong child_tidptr; |
pbrook | e6e5906 | 2006-10-22 00:18:54 +0000 | [diff] [blame] | 113 | #ifdef TARGET_M68K |
| 114 | int sim_syscalls; |
Peter Maydell | 1ccd937 | 2013-07-16 18:44:55 +0100 | [diff] [blame] | 115 | abi_ulong tp_value; |
pbrook | e6e5906 | 2006-10-22 00:18:54 +0000 | [diff] [blame] | 116 | #endif |
Guan Xuetao | d2fbca9 | 2011-04-12 16:27:03 +0800 | [diff] [blame] | 117 | #if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32) |
pbrook | a87295e | 2007-05-26 15:09:38 +0000 | [diff] [blame] | 118 | /* Extra fields for semihosted binaries. */ |
Peter Maydell | d317091 | 2016-07-04 13:06:35 +0100 | [diff] [blame] | 119 | abi_ulong heap_base; |
| 120 | abi_ulong heap_limit; |
pbrook | a87295e | 2007-05-26 15:09:38 +0000 | [diff] [blame] | 121 | #endif |
Peter Maydell | d317091 | 2016-07-04 13:06:35 +0100 | [diff] [blame] | 122 | abi_ulong stack_base; |
bellard | 851e67a | 2003-03-29 16:53:14 +0000 | [diff] [blame] | 123 | int used; /* non zero if used */ |
pbrook | 978efd6 | 2006-06-17 18:30:42 +0000 | [diff] [blame] | 124 | struct image_info *info; |
Mika Westerberg | edf8e2a | 2009-04-07 09:57:11 +0300 | [diff] [blame] | 125 | struct linux_binprm *bprm; |
pbrook | 624f797 | 2008-05-31 16:11:38 +0000 | [diff] [blame] | 126 | |
Timothy E Baldwin | 655ed67 | 2016-05-27 15:51:53 +0100 | [diff] [blame] | 127 | struct emulated_sigtable sync_signal; |
pbrook | 624f797 | 2008-05-31 16:11:38 +0000 | [diff] [blame] | 128 | struct emulated_sigtable sigtab[TARGET_NSIG]; |
Peter Maydell | 3d3efba | 2016-05-27 15:51:49 +0100 | [diff] [blame] | 129 | /* This thread's signal mask, as requested by the guest program. |
| 130 | * The actual signal mask of this thread may differ: |
| 131 | * + we don't let SIGSEGV and SIGBUS be blocked while running guest code |
| 132 | * + sometimes we block all signals to avoid races |
| 133 | */ |
| 134 | sigset_t signal_mask; |
| 135 | /* The signal mask imposed by a guest sigsuspend syscall, if we are |
| 136 | * currently in the middle of such a syscall |
| 137 | */ |
| 138 | sigset_t sigsuspend_mask; |
| 139 | /* Nonzero if we're leaving a sigsuspend and sigsuspend_mask is valid. */ |
| 140 | int in_sigsuspend; |
| 141 | |
| 142 | /* Nonzero if process_pending_signals() needs to do something (either |
| 143 | * handle a pending signal or unblock signals). |
| 144 | * This flag is written from a signal handler so should be accessed via |
| 145 | * the atomic_read() and atomic_write() functions. (It is not accessed |
| 146 | * from multiple threads.) |
| 147 | */ |
| 148 | int signal_pending; |
| 149 | |
bellard | 851e67a | 2003-03-29 16:53:14 +0000 | [diff] [blame] | 150 | } __attribute__((aligned(16))) TaskState; |
| 151 | |
aurel32 | d088d66 | 2009-01-30 20:09:01 +0000 | [diff] [blame] | 152 | extern char *exec_path; |
pbrook | 624f797 | 2008-05-31 16:11:38 +0000 | [diff] [blame] | 153 | void init_task_state(TaskState *ts); |
Mika Westerberg | edf8e2a | 2009-04-07 09:57:11 +0300 | [diff] [blame] | 154 | void task_settid(TaskState *); |
| 155 | void stop_all_tasks(void); |
pbrook | c593722 | 2006-05-14 11:30:38 +0000 | [diff] [blame] | 156 | extern const char *qemu_uname_release; |
Paul Brook | 379f669 | 2009-07-17 12:48:08 +0100 | [diff] [blame] | 157 | extern unsigned long mmap_min_addr; |
bellard | 851e67a | 2003-03-29 16:53:14 +0000 | [diff] [blame] | 158 | |
pbrook | e5fe0c5 | 2006-06-11 13:32:59 +0000 | [diff] [blame] | 159 | /* ??? See if we can avoid exposing so much of the loader internals. */ |
pbrook | e5fe0c5 | 2006-06-11 13:32:59 +0000 | [diff] [blame] | 160 | |
Richard Henderson | 9955ffa | 2010-07-27 10:25:30 -0700 | [diff] [blame] | 161 | /* Read a good amount of data initially, to hopefully get all the |
| 162 | program headers loaded. */ |
| 163 | #define BPRM_BUF_SIZE 1024 |
| 164 | |
pbrook | e5fe0c5 | 2006-06-11 13:32:59 +0000 | [diff] [blame] | 165 | /* |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 166 | * This structure is used to hold the arguments that are |
pbrook | e5fe0c5 | 2006-06-11 13:32:59 +0000 | [diff] [blame] | 167 | * used when loading binaries. |
| 168 | */ |
| 169 | struct linux_binprm { |
Richard Henderson | 9955ffa | 2010-07-27 10:25:30 -0700 | [diff] [blame] | 170 | char buf[BPRM_BUF_SIZE] __attribute__((aligned)); |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 171 | abi_ulong p; |
pbrook | e5fe0c5 | 2006-06-11 13:32:59 +0000 | [diff] [blame] | 172 | int fd; |
| 173 | int e_uid, e_gid; |
| 174 | int argc, envc; |
| 175 | char **argv; |
| 176 | char **envp; |
| 177 | char * filename; /* Name of binary */ |
Andreas Färber | 9349b4f | 2012-03-14 01:38:32 +0100 | [diff] [blame] | 178 | int (*core_dump)(int, const CPUArchState *); /* coredump routine */ |
pbrook | e5fe0c5 | 2006-06-11 13:32:59 +0000 | [diff] [blame] | 179 | }; |
| 180 | |
| 181 | void do_init_thread(struct target_pt_regs *regs, struct image_info *infop); |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 182 | abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, |
| 183 | abi_ulong stringp, int push_ptr); |
Laurent Vivier | 03cfd8f | 2013-08-30 01:46:44 +0200 | [diff] [blame] | 184 | int loader_exec(int fdexec, const char *filename, char **argv, char **envp, |
Mika Westerberg | edf8e2a | 2009-04-07 09:57:11 +0300 | [diff] [blame] | 185 | struct target_pt_regs * regs, struct image_info *infop, |
| 186 | struct linux_binprm *); |
bellard | 31e31b8 | 2003-02-18 22:55:36 +0000 | [diff] [blame] | 187 | |
Will Newton | f0116c5 | 2014-01-09 09:10:50 +0000 | [diff] [blame] | 188 | int load_elf_binary(struct linux_binprm *bprm, struct image_info *info); |
| 189 | int load_flt_binary(struct linux_binprm *bprm, struct image_info *info); |
pbrook | e5fe0c5 | 2006-06-11 13:32:59 +0000 | [diff] [blame] | 190 | |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 191 | abi_long memcpy_to_target(abi_ulong dest, const void *src, |
| 192 | unsigned long len); |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 193 | void target_set_brk(abi_ulong new_brk); |
| 194 | abi_long do_brk(abi_ulong new_brk); |
bellard | 31e31b8 | 2003-02-18 22:55:36 +0000 | [diff] [blame] | 195 | void syscall_init(void); |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 196 | abi_long do_syscall(void *cpu_env, int num, abi_long arg1, |
| 197 | abi_long arg2, abi_long arg3, abi_long arg4, |
Peter Maydell | 5945cfc | 2011-06-16 17:37:13 +0100 | [diff] [blame] | 198 | abi_long arg5, abi_long arg6, abi_long arg7, |
| 199 | abi_long arg8); |
Stefan Weil | e5924d8 | 2010-09-23 21:28:03 +0200 | [diff] [blame] | 200 | void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2); |
Andreas Färber | a2247f8 | 2013-06-09 19:47:04 +0200 | [diff] [blame] | 201 | extern THREAD CPUState *thread_cpu; |
Andreas Färber | 9349b4f | 2012-03-14 01:38:32 +0100 | [diff] [blame] | 202 | void cpu_loop(CPUArchState *env); |
Peter Maydell | 7dcdaea | 2016-06-06 19:58:18 +0100 | [diff] [blame] | 203 | const char *target_strerror(int err); |
pbrook | a745ec6 | 2008-05-06 15:36:17 +0000 | [diff] [blame] | 204 | int get_osversion(void); |
Peter Maydell | 4a24a75 | 2013-09-03 20:12:20 +0100 | [diff] [blame] | 205 | void init_qemu_uname_release(void); |
pbrook | d597536 | 2008-06-07 20:50:51 +0000 | [diff] [blame] | 206 | void fork_start(void); |
| 207 | void fork_end(int child); |
bellard | 6977fbf | 2003-04-29 20:39:23 +0000 | [diff] [blame] | 208 | |
Meador Inge | dce1040 | 2012-07-26 16:50:01 +0000 | [diff] [blame] | 209 | /* Creates the initial guest address space in the host memory space using |
| 210 | * the given host start address hint and size. The guest_start parameter |
| 211 | * specifies the start address of the guest space. guest_base will be the |
| 212 | * difference between the host start address computed by this function and |
| 213 | * guest_start. If fixed is specified, then the mapped address space must |
| 214 | * start at host_start. The real start address of the mapped memory space is |
| 215 | * returned or -1 if there was an error. |
| 216 | */ |
| 217 | unsigned long init_guest_space(unsigned long host_start, |
| 218 | unsigned long host_size, |
| 219 | unsigned long guest_start, |
| 220 | bool fixed); |
| 221 | |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 222 | #include "qemu/log.h" |
bellard | 631271d | 2003-05-10 13:14:52 +0000 | [diff] [blame] | 223 | |
Timothy E Baldwin | 4d330ce | 2016-05-12 18:47:46 +0100 | [diff] [blame] | 224 | /* safe_syscall.S */ |
| 225 | |
| 226 | /** |
| 227 | * safe_syscall: |
| 228 | * @int number: number of system call to make |
| 229 | * ...: arguments to the system call |
| 230 | * |
| 231 | * Call a system call if guest signal not pending. |
| 232 | * This has the same API as the libc syscall() function, except that it |
| 233 | * may return -1 with errno == TARGET_ERESTARTSYS if a signal was pending. |
| 234 | * |
| 235 | * Returns: the system call result, or -1 with an error code in errno |
| 236 | * (Errnos are host errnos; we rely on TARGET_ERESTARTSYS not clashing |
| 237 | * with any of the host errno values.) |
| 238 | */ |
| 239 | |
| 240 | /* A guide to using safe_syscall() to handle interactions between guest |
| 241 | * syscalls and guest signals: |
| 242 | * |
| 243 | * Guest syscalls come in two flavours: |
| 244 | * |
| 245 | * (1) Non-interruptible syscalls |
| 246 | * |
| 247 | * These are guest syscalls that never get interrupted by signals and |
| 248 | * so never return EINTR. They can be implemented straightforwardly in |
| 249 | * QEMU: just make sure that if the implementation code has to make any |
| 250 | * blocking calls that those calls are retried if they return EINTR. |
| 251 | * It's also OK to implement these with safe_syscall, though it will be |
| 252 | * a little less efficient if a signal is delivered at the 'wrong' moment. |
| 253 | * |
Peter Maydell | 3d3efba | 2016-05-27 15:51:49 +0100 | [diff] [blame] | 254 | * Some non-interruptible syscalls need to be handled using block_signals() |
| 255 | * to block signals for the duration of the syscall. This mainly applies |
| 256 | * to code which needs to modify the data structures used by the |
| 257 | * host_signal_handler() function and the functions it calls, including |
| 258 | * all syscalls which change the thread's signal mask. |
| 259 | * |
Timothy E Baldwin | 4d330ce | 2016-05-12 18:47:46 +0100 | [diff] [blame] | 260 | * (2) Interruptible syscalls |
| 261 | * |
| 262 | * These are guest syscalls that can be interrupted by signals and |
| 263 | * for which we need to either return EINTR or arrange for the guest |
| 264 | * syscall to be restarted. This category includes both syscalls which |
| 265 | * always restart (and in the kernel return -ERESTARTNOINTR), ones |
| 266 | * which only restart if there is no handler (kernel returns -ERESTARTNOHAND |
| 267 | * or -ERESTART_RESTARTBLOCK), and the most common kind which restart |
| 268 | * if the handler was registered with SA_RESTART (kernel returns |
| 269 | * -ERESTARTSYS). System calls which are only interruptible in some |
| 270 | * situations (like 'open') also need to be handled this way. |
| 271 | * |
| 272 | * Here it is important that the host syscall is made |
| 273 | * via this safe_syscall() function, and *not* via the host libc. |
| 274 | * If the host libc is used then the implementation will appear to work |
| 275 | * most of the time, but there will be a race condition where a |
| 276 | * signal could arrive just before we make the host syscall inside libc, |
| 277 | * and then then guest syscall will not correctly be interrupted. |
| 278 | * Instead the implementation of the guest syscall can use the safe_syscall |
| 279 | * function but otherwise just return the result or errno in the usual |
| 280 | * way; the main loop code will take care of restarting the syscall |
| 281 | * if appropriate. |
| 282 | * |
| 283 | * (If the implementation needs to make multiple host syscalls this is |
| 284 | * OK; any which might really block must be via safe_syscall(); for those |
| 285 | * which are only technically blocking (ie which we know in practice won't |
| 286 | * stay in the host kernel indefinitely) it's OK to use libc if necessary. |
| 287 | * You must be able to cope with backing out correctly if some safe_syscall |
| 288 | * you make in the implementation returns either -TARGET_ERESTARTSYS or |
| 289 | * EINTR though.) |
| 290 | * |
Peter Maydell | 3d3efba | 2016-05-27 15:51:49 +0100 | [diff] [blame] | 291 | * block_signals() cannot be used for interruptible syscalls. |
| 292 | * |
Timothy E Baldwin | 4d330ce | 2016-05-12 18:47:46 +0100 | [diff] [blame] | 293 | * |
| 294 | * How and why the safe_syscall implementation works: |
| 295 | * |
| 296 | * The basic setup is that we make the host syscall via a known |
| 297 | * section of host native assembly. If a signal occurs, our signal |
| 298 | * handler checks the interrupted host PC against the addresse of that |
| 299 | * known section. If the PC is before or at the address of the syscall |
| 300 | * instruction then we change the PC to point at a "return |
| 301 | * -TARGET_ERESTARTSYS" code path instead, and then exit the signal handler |
| 302 | * (causing the safe_syscall() call to immediately return that value). |
| 303 | * Then in the main.c loop if we see this magic return value we adjust |
| 304 | * the guest PC to wind it back to before the system call, and invoke |
| 305 | * the guest signal handler as usual. |
| 306 | * |
| 307 | * This winding-back will happen in two cases: |
| 308 | * (1) signal came in just before we took the host syscall (a race); |
| 309 | * in this case we'll take the guest signal and have another go |
| 310 | * at the syscall afterwards, and this is indistinguishable for the |
| 311 | * guest from the timing having been different such that the guest |
| 312 | * signal really did win the race |
| 313 | * (2) signal came in while the host syscall was blocking, and the |
| 314 | * host kernel decided the syscall should be restarted; |
| 315 | * in this case we want to restart the guest syscall also, and so |
| 316 | * rewinding is the right thing. (Note that "restart" semantics mean |
| 317 | * "first call the signal handler, then reattempt the syscall".) |
| 318 | * The other situation to consider is when a signal came in while the |
| 319 | * host syscall was blocking, and the host kernel decided that the syscall |
| 320 | * should not be restarted; in this case QEMU's host signal handler will |
| 321 | * be invoked with the PC pointing just after the syscall instruction, |
| 322 | * with registers indicating an EINTR return; the special code in the |
| 323 | * handler will not kick in, and we will return EINTR to the guest as |
| 324 | * we should. |
| 325 | * |
| 326 | * Notice that we can leave the host kernel to make the decision for |
| 327 | * us about whether to do a restart of the syscall or not; we do not |
| 328 | * need to check SA_RESTART flags in QEMU or distinguish the various |
| 329 | * kinds of restartability. |
| 330 | */ |
| 331 | #ifdef HAVE_SAFE_SYSCALL |
| 332 | /* The core part of this function is implemented in assembly */ |
| 333 | extern long safe_syscall_base(int *pending, long number, ...); |
| 334 | |
| 335 | #define safe_syscall(...) \ |
| 336 | ({ \ |
| 337 | long ret_; \ |
| 338 | int *psp_ = &((TaskState *)thread_cpu->opaque)->signal_pending; \ |
| 339 | ret_ = safe_syscall_base(psp_, __VA_ARGS__); \ |
| 340 | if (is_error(ret_)) { \ |
| 341 | errno = -ret_; \ |
| 342 | ret_ = -1; \ |
| 343 | } \ |
| 344 | ret_; \ |
| 345 | }) |
| 346 | |
| 347 | #else |
| 348 | |
| 349 | /* Fallback for architectures which don't yet provide a safe-syscall assembly |
| 350 | * fragment; note that this is racy! |
| 351 | * This should go away when all host architectures have been updated. |
| 352 | */ |
| 353 | #define safe_syscall syscall |
| 354 | |
| 355 | #endif |
| 356 | |
Richard Henderson | a05c640 | 2012-09-15 11:34:20 -0700 | [diff] [blame] | 357 | /* syscall.c */ |
| 358 | int host_to_target_waitstatus(int status); |
| 359 | |
ths | b92c47c | 2007-11-01 00:07:38 +0000 | [diff] [blame] | 360 | /* strace.c */ |
| 361 | void print_syscall(int num, |
bellard | c16f9ed | 2007-11-11 17:23:29 +0000 | [diff] [blame] | 362 | abi_long arg1, abi_long arg2, abi_long arg3, |
| 363 | abi_long arg4, abi_long arg5, abi_long arg6); |
| 364 | void print_syscall_ret(int num, abi_long arg1); |
Peter Maydell | 0cb581d | 2016-07-18 18:12:24 +0100 | [diff] [blame] | 365 | /** |
| 366 | * print_taken_signal: |
| 367 | * @target_signum: target signal being taken |
| 368 | * @tinfo: target_siginfo_t which will be passed to the guest for the signal |
| 369 | * |
| 370 | * Print strace output indicating that this signal is being taken by the guest, |
| 371 | * in a format similar to: |
| 372 | * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} --- |
| 373 | */ |
| 374 | void print_taken_signal(int target_signum, const target_siginfo_t *tinfo); |
ths | b92c47c | 2007-11-01 00:07:38 +0000 | [diff] [blame] | 375 | extern int do_strace; |
| 376 | |
bellard | b346ff4 | 2003-06-15 20:05:50 +0000 | [diff] [blame] | 377 | /* signal.c */ |
Andreas Färber | 9349b4f | 2012-03-14 01:38:32 +0100 | [diff] [blame] | 378 | void process_pending_signals(CPUArchState *cpu_env); |
bellard | b346ff4 | 2003-06-15 20:05:50 +0000 | [diff] [blame] | 379 | void signal_init(void); |
Peter Maydell | 9d2803f | 2016-07-28 16:44:46 +0100 | [diff] [blame] | 380 | int queue_signal(CPUArchState *env, int sig, int si_type, |
| 381 | target_siginfo_t *info); |
Anthony Liguori | c227f09 | 2009-10-01 16:12:16 -0500 | [diff] [blame] | 382 | void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); |
| 383 | void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); |
pbrook | 4cb0596 | 2008-05-30 18:05:19 +0000 | [diff] [blame] | 384 | int target_to_host_signal(int sig); |
pbrook | 1d9d8b5 | 2009-04-16 15:17:02 +0000 | [diff] [blame] | 385 | int host_to_target_signal(int sig); |
Andreas Färber | 9349b4f | 2012-03-14 01:38:32 +0100 | [diff] [blame] | 386 | long do_sigreturn(CPUArchState *env); |
| 387 | long do_rt_sigreturn(CPUArchState *env); |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 388 | abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp); |
Alex Barcelo | 1c27592 | 2014-03-14 14:36:55 +0000 | [diff] [blame] | 389 | int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); |
Peter Maydell | 3d3efba | 2016-05-27 15:51:49 +0100 | [diff] [blame] | 390 | /** |
| 391 | * block_signals: block all signals while handling this guest syscall |
| 392 | * |
| 393 | * Block all signals, and arrange that the signal mask is returned to |
| 394 | * its correct value for the guest before we resume execution of guest code. |
| 395 | * If this function returns non-zero, then the caller should immediately |
| 396 | * return -TARGET_ERESTARTSYS to the main loop, which will take the pending |
| 397 | * signal and restart execution of the syscall. |
| 398 | * If block_signals() returns zero, then the caller can continue with |
| 399 | * emulation of the system call knowing that no signals can be taken |
| 400 | * (and therefore that no race conditions will result). |
| 401 | * This should only be called once, because if it is called a second time |
| 402 | * it will always return non-zero. (Think of it like a mutex that can't |
| 403 | * be recursively locked.) |
| 404 | * Signals will be unblocked again by process_pending_signals(). |
| 405 | * |
| 406 | * Return value: non-zero if there was a pending signal, zero if not. |
| 407 | */ |
| 408 | int block_signals(void); /* Returns non zero if signal pending */ |
bellard | b346ff4 | 2003-06-15 20:05:50 +0000 | [diff] [blame] | 409 | |
| 410 | #ifdef TARGET_I386 |
bellard | 631271d | 2003-05-10 13:14:52 +0000 | [diff] [blame] | 411 | /* vm86.c */ |
| 412 | void save_v86_state(CPUX86State *env); |
bellard | 447db21 | 2003-05-10 15:10:36 +0000 | [diff] [blame] | 413 | void handle_vm86_trap(CPUX86State *env, int trapno); |
bellard | 631271d | 2003-05-10 13:14:52 +0000 | [diff] [blame] | 414 | void handle_vm86_fault(CPUX86State *env); |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 415 | int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr); |
blueswir1 | 5bfb56b | 2007-10-05 17:01:51 +0000 | [diff] [blame] | 416 | #elif defined(TARGET_SPARC64) |
| 417 | void sparc64_set_context(CPUSPARCState *env); |
| 418 | void sparc64_get_context(CPUSPARCState *env); |
bellard | b346ff4 | 2003-06-15 20:05:50 +0000 | [diff] [blame] | 419 | #endif |
bellard | 631271d | 2003-05-10 13:14:52 +0000 | [diff] [blame] | 420 | |
bellard | 5493600 | 2003-05-13 00:25:15 +0000 | [diff] [blame] | 421 | /* mmap.c */ |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 422 | int target_mprotect(abi_ulong start, abi_ulong len, int prot); |
| 423 | abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, |
| 424 | int flags, int fd, abi_ulong offset); |
| 425 | int target_munmap(abi_ulong start, abi_ulong len); |
| 426 | abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, |
| 427 | abi_ulong new_size, unsigned long flags, |
| 428 | abi_ulong new_addr); |
| 429 | int target_msync(abi_ulong start, abi_ulong len, int flags); |
pbrook | 0776590 | 2008-05-31 16:33:53 +0000 | [diff] [blame] | 430 | extern unsigned long last_brk; |
Peter Maydell | 59e9d91 | 2012-03-08 14:40:33 +0000 | [diff] [blame] | 431 | extern abi_ulong mmap_next_start; |
Riku Voipio | 9ad197d | 2009-04-21 17:23:23 +0300 | [diff] [blame] | 432 | abi_ulong mmap_find_vma(abi_ulong, abi_ulong); |
pbrook | d597536 | 2008-06-07 20:50:51 +0000 | [diff] [blame] | 433 | void mmap_fork_start(void); |
| 434 | void mmap_fork_end(int child); |
bellard | 5493600 | 2003-05-13 00:25:15 +0000 | [diff] [blame] | 435 | |
blueswir1 | 440c7e8 | 2008-10-05 11:05:14 +0000 | [diff] [blame] | 436 | /* main.c */ |
Richard Henderson | 703e0e8 | 2010-03-19 14:21:13 -0700 | [diff] [blame] | 437 | extern unsigned long guest_stack_size; |
blueswir1 | 440c7e8 | 2008-10-05 11:05:14 +0000 | [diff] [blame] | 438 | |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 439 | /* user access */ |
| 440 | |
| 441 | #define VERIFY_READ 0 |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 442 | #define VERIFY_WRITE 1 /* implies read access */ |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 443 | |
bellard | dae3270 | 2007-11-14 10:51:00 +0000 | [diff] [blame] | 444 | static inline int access_ok(int type, abi_ulong addr, abi_ulong size) |
| 445 | { |
| 446 | return page_check_range((target_ulong)addr, size, |
| 447 | (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0; |
| 448 | } |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 449 | |
Richard Henderson | 658f2dc | 2013-01-04 16:39:31 -0800 | [diff] [blame] | 450 | /* NOTE __get_user and __put_user use host pointers and don't check access. |
| 451 | These are usually used to access struct data members once the struct has |
| 452 | been locked - usually with lock_user_struct. */ |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 453 | |
Richard Henderson | 658f2dc | 2013-01-04 16:39:31 -0800 | [diff] [blame] | 454 | /* Tricky points: |
| 455 | - Use __builtin_choose_expr to avoid type promotion from ?:, |
| 456 | - Invalid sizes result in a compile time error stemming from |
| 457 | the fact that abort has no parameters. |
| 458 | - It's easier to use the endian-specific unaligned load/store |
| 459 | functions than host-endian unaligned load/store plus tswapN. */ |
| 460 | |
| 461 | #define __put_user_e(x, hptr, e) \ |
| 462 | (__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p, \ |
| 463 | __builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p, \ |
| 464 | __builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p, \ |
| 465 | __builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort)))) \ |
Riku Voipio | a42267e | 2014-04-22 15:40:50 +0300 | [diff] [blame] | 466 | ((hptr), (x)), (void)0) |
Richard Henderson | 658f2dc | 2013-01-04 16:39:31 -0800 | [diff] [blame] | 467 | |
| 468 | #define __get_user_e(x, hptr, e) \ |
Peter Maydell | 0bc8ce9 | 2013-01-31 12:50:40 +0000 | [diff] [blame] | 469 | ((x) = (typeof(*hptr))( \ |
Richard Henderson | 658f2dc | 2013-01-04 16:39:31 -0800 | [diff] [blame] | 470 | __builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p, \ |
| 471 | __builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p, \ |
| 472 | __builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p, \ |
| 473 | __builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort)))) \ |
Riku Voipio | a42267e | 2014-04-22 15:40:50 +0300 | [diff] [blame] | 474 | (hptr)), (void)0) |
Richard Henderson | 658f2dc | 2013-01-04 16:39:31 -0800 | [diff] [blame] | 475 | |
| 476 | #ifdef TARGET_WORDS_BIGENDIAN |
| 477 | # define __put_user(x, hptr) __put_user_e(x, hptr, be) |
| 478 | # define __get_user(x, hptr) __get_user_e(x, hptr, be) |
| 479 | #else |
| 480 | # define __put_user(x, hptr) __put_user_e(x, hptr, le) |
| 481 | # define __get_user(x, hptr) __get_user_e(x, hptr, le) |
| 482 | #endif |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 483 | |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 484 | /* put_user()/get_user() take a guest address and check access */ |
| 485 | /* These are usually used to access an atomic data type, such as an int, |
| 486 | * that has been passed by address. These internally perform locking |
| 487 | * and unlocking on the data type. |
| 488 | */ |
| 489 | #define put_user(x, gaddr, target_type) \ |
| 490 | ({ \ |
| 491 | abi_ulong __gaddr = (gaddr); \ |
| 492 | target_type *__hptr; \ |
Riku Voipio | a42267e | 2014-04-22 15:40:50 +0300 | [diff] [blame] | 493 | abi_long __ret = 0; \ |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 494 | if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \ |
Riku Voipio | a42267e | 2014-04-22 15:40:50 +0300 | [diff] [blame] | 495 | __put_user((x), __hptr); \ |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 496 | unlock_user(__hptr, __gaddr, sizeof(target_type)); \ |
| 497 | } else \ |
| 498 | __ret = -TARGET_EFAULT; \ |
| 499 | __ret; \ |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 500 | }) |
| 501 | |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 502 | #define get_user(x, gaddr, target_type) \ |
| 503 | ({ \ |
| 504 | abi_ulong __gaddr = (gaddr); \ |
| 505 | target_type *__hptr; \ |
Riku Voipio | a42267e | 2014-04-22 15:40:50 +0300 | [diff] [blame] | 506 | abi_long __ret = 0; \ |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 507 | if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \ |
Riku Voipio | a42267e | 2014-04-22 15:40:50 +0300 | [diff] [blame] | 508 | __get_user((x), __hptr); \ |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 509 | unlock_user(__hptr, __gaddr, 0); \ |
bellard | 2f61969 | 2007-11-16 10:46:05 +0000 | [diff] [blame] | 510 | } else { \ |
| 511 | /* avoid warning */ \ |
| 512 | (x) = 0; \ |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 513 | __ret = -TARGET_EFAULT; \ |
bellard | 2f61969 | 2007-11-16 10:46:05 +0000 | [diff] [blame] | 514 | } \ |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 515 | __ret; \ |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 516 | }) |
| 517 | |
bellard | 2f61969 | 2007-11-16 10:46:05 +0000 | [diff] [blame] | 518 | #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong) |
| 519 | #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long) |
| 520 | #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t) |
| 521 | #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t) |
| 522 | #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t) |
| 523 | #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t) |
| 524 | #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t) |
| 525 | #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t) |
| 526 | #define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t) |
| 527 | #define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t) |
| 528 | |
| 529 | #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong) |
| 530 | #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long) |
| 531 | #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t) |
| 532 | #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t) |
| 533 | #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t) |
| 534 | #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t) |
| 535 | #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t) |
| 536 | #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t) |
| 537 | #define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t) |
| 538 | #define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t) |
| 539 | |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 540 | /* copy_from_user() and copy_to_user() are usually used to copy data |
| 541 | * buffers between the target and host. These internally perform |
| 542 | * locking/unlocking of the memory. |
| 543 | */ |
| 544 | abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len); |
| 545 | abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len); |
| 546 | |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 547 | /* Functions for accessing guest memory. The tget and tput functions |
Stefan Weil | 6f20f55 | 2013-09-12 19:57:15 +0200 | [diff] [blame] | 548 | read/write single values, byteswapping as necessary. The lock_user function |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 549 | gets a pointer to a contiguous area of guest memory, but does not perform |
Stefan Weil | 6f20f55 | 2013-09-12 19:57:15 +0200 | [diff] [blame] | 550 | any byteswapping. lock_user may return either a pointer to the guest |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 551 | memory, or a temporary buffer. */ |
| 552 | |
| 553 | /* Lock an area of guest memory into the host. If copy is true then the |
| 554 | host area will have the same contents as the guest. */ |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 555 | static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy) |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 556 | { |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 557 | if (!access_ok(type, guest_addr, len)) |
| 558 | return NULL; |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 559 | #ifdef DEBUG_REMAP |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 560 | { |
| 561 | void *addr; |
Md Haris Iqbal | 38e826d | 2016-03-24 00:02:03 +0530 | [diff] [blame] | 562 | addr = g_malloc(len); |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 563 | if (copy) |
| 564 | memcpy(addr, g2h(guest_addr), len); |
| 565 | else |
| 566 | memset(addr, 0, len); |
| 567 | return addr; |
| 568 | } |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 569 | #else |
| 570 | return g2h(guest_addr); |
| 571 | #endif |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 572 | } |
| 573 | |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 574 | /* Unlock an area of guest memory. The first LEN bytes must be |
ths | 1235fc0 | 2008-06-03 19:51:57 +0000 | [diff] [blame] | 575 | flushed back to guest memory. host_ptr = NULL is explicitly |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 576 | allowed and does nothing. */ |
| 577 | static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 578 | long len) |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 579 | { |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 580 | |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 581 | #ifdef DEBUG_REMAP |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 582 | if (!host_ptr) |
| 583 | return; |
| 584 | if (host_ptr == g2h(guest_addr)) |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 585 | return; |
| 586 | if (len > 0) |
balrog | 06177d3 | 2007-12-24 13:47:52 +0000 | [diff] [blame] | 587 | memcpy(g2h(guest_addr), host_ptr, len); |
Md Haris Iqbal | 38e826d | 2016-03-24 00:02:03 +0530 | [diff] [blame] | 588 | g_free(host_ptr); |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 589 | #endif |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 590 | } |
| 591 | |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 592 | /* Return the length of a string in target memory or -TARGET_EFAULT if |
| 593 | access error. */ |
| 594 | abi_long target_strlen(abi_ulong gaddr); |
bellard | edf779f | 2004-02-22 13:40:13 +0000 | [diff] [blame] | 595 | |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 596 | /* Like lock_user but for null terminated strings. */ |
blueswir1 | 992f48a | 2007-10-14 16:27:31 +0000 | [diff] [blame] | 597 | static inline void *lock_user_string(abi_ulong guest_addr) |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 598 | { |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 599 | abi_long len; |
| 600 | len = target_strlen(guest_addr); |
| 601 | if (len < 0) |
| 602 | return NULL; |
| 603 | return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1); |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 604 | } |
| 605 | |
Stefan Weil | 41d1af4 | 2013-09-12 19:57:41 +0200 | [diff] [blame] | 606 | /* Helper macros for locking/unlocking a target struct. */ |
bellard | 579a97f | 2007-11-11 14:26:47 +0000 | [diff] [blame] | 607 | #define lock_user_struct(type, host_ptr, guest_addr, copy) \ |
| 608 | (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy)) |
| 609 | #define unlock_user_struct(host_ptr, guest_addr, copy) \ |
pbrook | 53a5960 | 2006-03-25 19:31:22 +0000 | [diff] [blame] | 610 | unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0) |
| 611 | |
pbrook | c8a706f | 2008-06-02 16:16:42 +0000 | [diff] [blame] | 612 | #include <pthread.h> |
pbrook | c8a706f | 2008-06-02 16:16:42 +0000 | [diff] [blame] | 613 | |
Peter Maydell | dfeab06 | 2013-07-16 18:44:52 +0100 | [diff] [blame] | 614 | /* Include target-specific struct and function definitions; |
| 615 | * they may need access to the target-independent structures |
| 616 | * above, so include them last. |
| 617 | */ |
| 618 | #include "target_cpu.h" |
| 619 | #include "target_signal.h" |
Petar Jovanovic | 55a2b16 | 2013-10-30 14:46:31 +0100 | [diff] [blame] | 620 | #include "target_structs.h" |
Peter Maydell | dfeab06 | 2013-07-16 18:44:52 +0100 | [diff] [blame] | 621 | |
bellard | e88de09 | 2005-02-07 12:35:39 +0000 | [diff] [blame] | 622 | #endif /* QEMU_H */ |