2014-06-08 18:57:23 +02:00
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/*
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* qemu bsd user mode definition
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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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2008-10-26 21:33:16 +01:00
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#ifndef QEMU_H
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#define QEMU_H
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#include "cpu.h"
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2014-03-28 19:42:10 +01:00
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#include "exec/cpu_ldst.h"
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2008-10-26 21:33:16 +01:00
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#undef DEBUG_REMAP
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#ifdef DEBUG_REMAP
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#endif /* DEBUG_REMAP */
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2012-12-17 18:19:49 +01:00
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#include "exec/user/abitypes.h"
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2008-10-26 21:33:16 +01:00
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2021-04-23 18:41:11 +02:00
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extern char **environ;
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2008-10-26 21:33:16 +01:00
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enum BSDType {
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target_freebsd,
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target_netbsd,
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target_openbsd,
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};
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2009-10-17 00:34:26 +02:00
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extern enum BSDType bsd_type;
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2008-10-26 21:33:16 +01:00
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#include "syscall_defs.h"
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2016-02-01 19:38:47 +01:00
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#include "target_syscall.h"
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2012-12-17 18:19:49 +01:00
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#include "exec/gdbstub.h"
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2008-10-26 21:33:16 +01:00
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2009-07-27 16:13:24 +02:00
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#if defined(CONFIG_USE_NPTL)
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2008-10-26 21:33:16 +01:00
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#define THREAD __thread
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#else
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#define THREAD
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#endif
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2021-04-24 03:50:53 +02:00
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/*
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* This struct is used to hold certain information about the image. Basically,
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* it replicates in user space what would be certain task_struct fields in the
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* kernel
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2008-10-26 21:33:16 +01:00
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*/
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struct image_info {
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abi_ulong load_addr;
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abi_ulong start_code;
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abi_ulong end_code;
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abi_ulong start_data;
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abi_ulong end_data;
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abi_ulong start_brk;
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abi_ulong brk;
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abi_ulong start_mmap;
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abi_ulong mmap;
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abi_ulong rss;
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abi_ulong start_stack;
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abi_ulong entry;
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abi_ulong code_offset;
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abi_ulong data_offset;
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};
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#define MAX_SIGQUEUE_SIZE 1024
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struct sigqueue {
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struct sigqueue *next;
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};
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struct emulated_sigtable {
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int pending; /* true if signal is pending */
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struct sigqueue *first;
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2021-04-24 03:50:53 +02:00
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/* in order to always have memory for the first signal, we put it here */
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struct sigqueue info;
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2008-10-26 21:33:16 +01:00
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};
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2021-04-24 03:50:53 +02:00
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/*
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* NOTE: we force a big alignment so that the stack stored after is aligned too
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*/
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2008-10-26 21:33:16 +01:00
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typedef struct TaskState {
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2017-07-12 12:52:15 +02:00
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pid_t ts_tid; /* tid (or pid) of this task */
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2008-10-26 21:33:16 +01:00
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struct TaskState *next;
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int used; /* non zero if used */
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struct image_info *info;
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struct emulated_sigtable sigtab[TARGET_NSIG];
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struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
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struct sigqueue *first_free; /* first free siginfo queue entry */
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int signal_pending; /* non zero if a signal may be pending */
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misc: Replace zero-length arrays with flexible array member (automatic)
Description copied from Linux kernel commit from Gustavo A. R. Silva
(see [3]):
--v-- description start --v--
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to
declare variable-length types such as these ones is a flexible
array member [1], introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler
warning in case the flexible array does not occur last in the
structure, which will help us prevent some kind of undefined
behavior bugs from being unadvertenly introduced [2] to the
Linux codebase from now on.
--^-- description end --^--
Do the similar housekeeping in the QEMU codebase (which uses
C99 since commit 7be41675f7cb).
All these instances of code were found with the help of the
following Coccinelle script:
@@
identifier s, m, a;
type t, T;
@@
struct s {
...
t m;
- T a[0];
+ T a[];
};
@@
identifier s, m, a;
type t, T;
@@
struct s {
...
t m;
- T a[0];
+ T a[];
} QEMU_PACKED;
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76497732932f
[3] https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=17642a2fbd2c1
Inspired-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-03-04 16:38:15 +01:00
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uint8_t stack[];
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2008-10-26 21:33:16 +01:00
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} __attribute__((aligned(16))) TaskState;
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void init_task_state(TaskState *ts);
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extern const char *qemu_uname_release;
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2009-09-27 21:30:51 +02:00
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extern unsigned long mmap_min_addr;
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2008-10-26 21:33:16 +01:00
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/*
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* MAX_ARG_PAGES defines the number of pages allocated for arguments
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* and envelope for the new program. 32 should suffice, this gives
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* a maximum env+arg of 128kB w/4KB pages!
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*/
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#define MAX_ARG_PAGES 32
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/*
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* This structure is used to hold the arguments that are
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* used when loading binaries.
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*/
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2021-04-29 18:04:28 +02:00
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struct bsd_binprm {
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2008-10-26 21:33:16 +01:00
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char buf[128];
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void *page[MAX_ARG_PAGES];
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abi_ulong p;
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int fd;
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int e_uid, e_gid;
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int argc, envc;
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char **argv;
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char **envp;
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2021-04-30 03:34:34 +02:00
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char *filename; /* (Given) Name of binary */
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char *fullpath; /* Full path of binary */
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2008-10-26 21:33:16 +01:00
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};
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void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
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abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
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2021-04-30 16:17:23 +02:00
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abi_ulong stringp);
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2021-04-24 03:45:20 +02:00
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int loader_exec(const char *filename, char **argv, char **envp,
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2021-04-30 02:45:13 +02:00
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struct target_pt_regs *regs, struct image_info *infop,
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struct bsd_binprm *bprm);
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2008-10-26 21:33:16 +01:00
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2021-04-29 18:04:28 +02:00
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int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
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2021-04-24 03:45:20 +02:00
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struct image_info *info);
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2021-04-29 18:04:28 +02:00
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int load_flt_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
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2021-04-24 03:45:20 +02:00
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struct image_info *info);
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2008-10-26 21:33:16 +01:00
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abi_long memcpy_to_target(abi_ulong dest, const void *src,
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unsigned long len);
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void target_set_brk(abi_ulong new_brk);
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abi_long do_brk(abi_ulong new_brk);
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void syscall_init(void);
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abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4,
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2009-10-17 00:34:26 +02:00
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abi_long arg5, abi_long arg6, abi_long arg7,
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abi_long arg8);
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2008-10-26 21:33:16 +01:00
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abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4,
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abi_long arg5, abi_long arg6);
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abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4,
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abi_long arg5, abi_long arg6);
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2010-09-23 21:28:03 +02:00
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void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
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2013-06-09 19:51:23 +02:00
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extern THREAD CPUState *thread_cpu;
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2012-03-14 01:38:32 +01:00
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void cpu_loop(CPUArchState *env);
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2008-10-26 21:33:16 +01:00
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char *target_strerror(int err);
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int get_osversion(void);
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void fork_start(void);
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void fork_end(int child);
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2012-12-17 18:20:00 +01:00
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#include "qemu/log.h"
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2008-10-26 21:33:16 +01:00
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/* strace.c */
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2014-06-08 18:57:23 +02:00
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struct syscallname {
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int nr;
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const char *name;
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const char *format;
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void (*call)(const struct syscallname *,
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abi_long, abi_long, abi_long,
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abi_long, abi_long, abi_long);
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void (*result)(const struct syscallname *, abi_long);
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};
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2008-10-26 21:33:16 +01:00
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void
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print_freebsd_syscall(int num,
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abi_long arg1, abi_long arg2, abi_long arg3,
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abi_long arg4, abi_long arg5, abi_long arg6);
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void print_freebsd_syscall_ret(int num, abi_long ret);
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void
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print_netbsd_syscall(int num,
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abi_long arg1, abi_long arg2, abi_long arg3,
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abi_long arg4, abi_long arg5, abi_long arg6);
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void print_netbsd_syscall_ret(int num, abi_long ret);
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void
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print_openbsd_syscall(int num,
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abi_long arg1, abi_long arg2, abi_long arg3,
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abi_long arg4, abi_long arg5, abi_long arg6);
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void print_openbsd_syscall_ret(int num, abi_long ret);
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extern int do_strace;
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/* signal.c */
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2012-03-14 01:38:32 +01:00
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void process_pending_signals(CPUArchState *cpu_env);
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2008-10-26 21:33:16 +01:00
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void signal_init(void);
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2012-03-14 01:38:32 +01:00
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long do_sigreturn(CPUArchState *env);
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long do_rt_sigreturn(CPUArchState *env);
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2008-10-26 21:33:16 +01:00
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abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
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/* mmap.c */
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int target_mprotect(abi_ulong start, abi_ulong len, int prot);
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abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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int flags, int fd, abi_ulong offset);
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int target_munmap(abi_ulong start, abi_ulong len);
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abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
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abi_ulong new_size, unsigned long flags,
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abi_ulong new_addr);
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int target_msync(abi_ulong start, abi_ulong len, int flags);
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extern unsigned long last_brk;
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void mmap_fork_start(void);
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void mmap_fork_end(int child);
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2009-08-01 12:29:42 +02:00
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/* main.c */
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extern unsigned long x86_stack_size;
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2008-10-26 21:33:16 +01:00
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/* user access */
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2021-02-12 19:48:39 +01:00
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#define VERIFY_READ PAGE_READ
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#define VERIFY_WRITE (PAGE_READ | PAGE_WRITE)
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2008-10-26 21:33:16 +01:00
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2021-02-12 19:48:39 +01:00
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static inline bool access_ok(int type, abi_ulong addr, abi_ulong size)
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2008-10-26 21:33:16 +01:00
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{
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2021-02-12 19:48:39 +01:00
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return page_check_range((target_ulong)addr, size, type) == 0;
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2008-10-26 21:33:16 +01:00
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}
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2021-04-24 03:50:53 +02:00
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/*
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* NOTE __get_user and __put_user use host pointers and don't check access.
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*
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* These are usually used to access struct data members once the struct has been
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* locked - usually with lock_user_struct().
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2008-10-26 21:33:16 +01:00
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*/
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#define __put_user(x, hptr)\
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({\
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int size = sizeof(*hptr);\
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2021-04-23 17:05:57 +02:00
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switch (size) {\
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2008-10-26 21:33:16 +01:00
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case 1:\
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*(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
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break;\
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case 2:\
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*(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
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break;\
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case 4:\
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*(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
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break;\
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case 8:\
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*(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
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break;\
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default:\
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abort();\
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2021-04-24 03:45:20 +02:00
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} \
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2008-10-26 21:33:16 +01:00
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0;\
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})
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#define __get_user(x, hptr) \
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({\
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int size = sizeof(*hptr);\
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2021-04-23 17:05:57 +02:00
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switch (size) {\
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2008-10-26 21:33:16 +01:00
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case 1:\
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x = (typeof(*hptr))*(uint8_t *)(hptr);\
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break;\
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case 2:\
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x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
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break;\
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case 4:\
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x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
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break;\
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case 8:\
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x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
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break;\
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default:\
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x = 0;\
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abort();\
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2021-04-24 03:45:20 +02:00
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} \
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2008-10-26 21:33:16 +01:00
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0;\
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})
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2021-04-24 03:50:53 +02:00
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/*
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* put_user()/get_user() take a guest address and check access
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*
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* These are usually used to access an atomic data type, such as an int, that
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* has been passed by address. These internally perform locking and unlocking
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* on the data type.
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2008-10-26 21:33:16 +01:00
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*/
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#define put_user(x, gaddr, target_type) \
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({ \
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|
|
|
abi_ulong __gaddr = (gaddr); \
|
|
|
|
target_type *__hptr; \
|
|
|
|
abi_long __ret; \
|
2021-04-24 03:53:36 +02:00
|
|
|
__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0); \
|
|
|
|
if (__hptr) { \
|
2008-10-26 21:33:16 +01:00
|
|
|
__ret = __put_user((x), __hptr); \
|
|
|
|
unlock_user(__hptr, __gaddr, sizeof(target_type)); \
|
|
|
|
} else \
|
|
|
|
__ret = -TARGET_EFAULT; \
|
|
|
|
__ret; \
|
|
|
|
})
|
|
|
|
|
|
|
|
#define get_user(x, gaddr, target_type) \
|
|
|
|
({ \
|
|
|
|
abi_ulong __gaddr = (gaddr); \
|
|
|
|
target_type *__hptr; \
|
|
|
|
abi_long __ret; \
|
2021-04-24 03:53:36 +02:00
|
|
|
__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1); \
|
|
|
|
if (__hptr) { \
|
2008-10-26 21:33:16 +01:00
|
|
|
__ret = __get_user((x), __hptr); \
|
|
|
|
unlock_user(__hptr, __gaddr, 0); \
|
|
|
|
} else { \
|
|
|
|
(x) = 0; \
|
|
|
|
__ret = -TARGET_EFAULT; \
|
|
|
|
} \
|
|
|
|
__ret; \
|
|
|
|
})
|
|
|
|
|
|
|
|
#define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
|
|
|
|
#define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
|
|
|
|
#define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
|
|
|
|
#define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
|
|
|
|
#define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
|
|
|
|
#define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
|
|
|
|
#define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
|
|
|
|
#define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
|
|
|
|
#define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t)
|
|
|
|
#define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t)
|
|
|
|
|
|
|
|
#define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
|
|
|
|
#define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
|
|
|
|
#define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
|
|
|
|
#define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
|
|
|
|
#define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
|
|
|
|
#define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
|
|
|
|
#define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
|
|
|
|
#define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
|
|
|
|
#define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t)
|
|
|
|
#define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t)
|
|
|
|
|
2021-04-24 03:50:53 +02:00
|
|
|
/*
|
|
|
|
* copy_from_user() and copy_to_user() are usually used to copy data
|
2008-10-26 21:33:16 +01:00
|
|
|
* buffers between the target and host. These internally perform
|
|
|
|
* locking/unlocking of the memory.
|
|
|
|
*/
|
|
|
|
abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
|
|
|
|
abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
|
|
|
|
|
2021-04-24 03:50:53 +02:00
|
|
|
/*
|
|
|
|
* Functions for accessing guest memory. The tget and tput functions
|
|
|
|
* read/write single values, byteswapping as necessary. The lock_user function
|
|
|
|
* gets a pointer to a contiguous area of guest memory, but does not perform
|
|
|
|
* any byteswapping. lock_user may return either a pointer to the guest
|
|
|
|
* memory, or a temporary buffer.
|
|
|
|
*/
|
2008-10-26 21:33:16 +01:00
|
|
|
|
2021-04-24 03:50:53 +02:00
|
|
|
/*
|
|
|
|
* Lock an area of guest memory into the host. If copy is true then the
|
|
|
|
* host area will have the same contents as the guest.
|
|
|
|
*/
|
|
|
|
static inline void *lock_user(int type, abi_ulong guest_addr, long len,
|
|
|
|
int copy)
|
2008-10-26 21:33:16 +01:00
|
|
|
{
|
2021-04-24 03:55:03 +02:00
|
|
|
if (!access_ok(type, guest_addr, len)) {
|
2008-10-26 21:33:16 +01:00
|
|
|
return NULL;
|
2021-04-24 03:55:03 +02:00
|
|
|
}
|
2008-10-26 21:33:16 +01:00
|
|
|
#ifdef DEBUG_REMAP
|
|
|
|
{
|
|
|
|
void *addr;
|
2016-04-05 15:09:03 +02:00
|
|
|
addr = g_malloc(len);
|
2021-04-24 03:55:03 +02:00
|
|
|
if (copy) {
|
2021-02-12 19:48:43 +01:00
|
|
|
memcpy(addr, g2h_untagged(guest_addr), len);
|
2021-04-24 03:55:03 +02:00
|
|
|
} else {
|
2008-10-26 21:33:16 +01:00
|
|
|
memset(addr, 0, len);
|
2021-04-24 03:55:03 +02:00
|
|
|
}
|
2008-10-26 21:33:16 +01:00
|
|
|
return addr;
|
|
|
|
}
|
|
|
|
#else
|
2021-02-12 19:48:43 +01:00
|
|
|
return g2h_untagged(guest_addr);
|
2008-10-26 21:33:16 +01:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2021-04-24 03:50:53 +02:00
|
|
|
/*
|
|
|
|
* Unlock an area of guest memory. The first LEN bytes must be flushed back to
|
|
|
|
* guest memory. host_ptr = NULL is explicitly allowed and does nothing.
|
|
|
|
*/
|
2008-10-26 21:33:16 +01:00
|
|
|
static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
|
|
|
|
long len)
|
|
|
|
{
|
|
|
|
|
|
|
|
#ifdef DEBUG_REMAP
|
2021-04-24 03:55:03 +02:00
|
|
|
if (!host_ptr) {
|
2008-10-26 21:33:16 +01:00
|
|
|
return;
|
2021-04-24 03:55:03 +02:00
|
|
|
}
|
|
|
|
if (host_ptr == g2h_untagged(guest_addr)) {
|
2008-10-26 21:33:16 +01:00
|
|
|
return;
|
2021-04-24 03:55:03 +02:00
|
|
|
}
|
|
|
|
if (len > 0) {
|
2021-02-12 19:48:43 +01:00
|
|
|
memcpy(g2h_untagged(guest_addr), host_ptr, len);
|
2021-04-24 03:55:03 +02:00
|
|
|
}
|
2016-04-05 15:09:03 +02:00
|
|
|
g_free(host_ptr);
|
2008-10-26 21:33:16 +01:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2021-04-24 03:50:53 +02:00
|
|
|
/*
|
|
|
|
* Return the length of a string in target memory or -TARGET_EFAULT if access
|
|
|
|
* error.
|
|
|
|
*/
|
2008-10-26 21:33:16 +01:00
|
|
|
abi_long target_strlen(abi_ulong gaddr);
|
|
|
|
|
|
|
|
/* Like lock_user but for null terminated strings. */
|
|
|
|
static inline void *lock_user_string(abi_ulong guest_addr)
|
|
|
|
{
|
|
|
|
abi_long len;
|
|
|
|
len = target_strlen(guest_addr);
|
2021-04-24 03:55:03 +02:00
|
|
|
if (len < 0) {
|
2008-10-26 21:33:16 +01:00
|
|
|
return NULL;
|
2021-04-24 03:55:03 +02:00
|
|
|
}
|
2008-10-26 21:33:16 +01:00
|
|
|
return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
|
|
|
|
}
|
|
|
|
|
2013-09-12 19:57:41 +02:00
|
|
|
/* Helper macros for locking/unlocking a target struct. */
|
2008-10-26 21:33:16 +01:00
|
|
|
#define lock_user_struct(type, host_ptr, guest_addr, copy) \
|
|
|
|
(host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
|
|
|
|
#define unlock_user_struct(host_ptr, guest_addr, copy) \
|
|
|
|
unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
|
|
|
|
|
2009-07-27 16:13:24 +02:00
|
|
|
#if defined(CONFIG_USE_NPTL)
|
2008-10-26 21:33:16 +01:00
|
|
|
#include <pthread.h>
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#endif /* QEMU_H */
|