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This patch implements strace argument printing functionality for following syscalls:
* mlock, munlock, mlockall, munlockall - lock and unlock memory
int mlock(const void *addr, size_t len)
int munlock(const void *addr, size_t len)
int mlockall(int flags)
int munlockall(void)
man page: https://man7.org/linux/man-pages/man2/mlock.2.html
Implementation notes:
Syscall mlockall() takes an argument that is composed of predefined values
which represent flags that determine the type of locking operation that is
to be performed. For that reason, a printing function "print_mlockall" was
stated in file "strace.list". This printing function uses an already existing
function "print_flags()" to print the "flags" argument. These flags are stated
inside an array "mlockall_flags" that contains values of type "struct flags".
These values are instantiated using an existing macro "FLAG_TARGET()" that
crates aproppriate target flag values based on those defined in files
'/target_syscall.h'. These target flag values were changed from
"TARGET_MLOCKALL_MCL*" to "TARGET_MCL_*" so that they can be aproppriately set
and recognised in "strace.c" with "FLAG_TARGET()". Value for "MCL_ONFAULT"
was added in this patch. This value was also added in "syscall.c" in function
"target_to_host_mlockall_arg()". Because this flag value was added in kernel
version 4.4, it is enwrapped in an #ifdef directive (both in "syscall.c" and
in "strace.c") as to support older kernel versions.
The other syscalls have only primitive argument types, so the
rest of the implementation was handled by stating an appropriate
printing format in file "strace.list". Syscall mlock2() is not implemented in
"syscall.c" and thus it's argument printing is not implemented in this patch.
Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200811164553.27713-4-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
#ifndef X86_64_TARGET_SYSCALL_H
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#define X86_64_TARGET_SYSCALL_H
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#define __USER_CS (0x33)
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#define __USER_DS (0x2B)
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struct target_pt_regs {
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abi_ulong r15;
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abi_ulong r14;
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abi_ulong r13;
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abi_ulong r12;
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abi_ulong rbp;
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abi_ulong rbx;
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/* arguments: non interrupts/non tracing syscalls only save up to here */
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abi_ulong r11;
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abi_ulong r10;
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abi_ulong r9;
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abi_ulong r8;
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abi_ulong rax;
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abi_ulong rcx;
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abi_ulong rdx;
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abi_ulong rsi;
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abi_ulong rdi;
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abi_ulong orig_rax;
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/* end of arguments */
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/* cpu exception frame or undefined */
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abi_ulong rip;
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abi_ulong cs;
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abi_ulong eflags;
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abi_ulong rsp;
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abi_ulong ss;
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/* top of stack page */
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};
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/* Maximum number of LDT entries supported. */
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#define TARGET_LDT_ENTRIES 8192
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/* The size of each LDT entry. */
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#define TARGET_LDT_ENTRY_SIZE 8
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#define TARGET_GDT_ENTRIES 16
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#define TARGET_GDT_ENTRY_TLS_ENTRIES 3
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#define TARGET_GDT_ENTRY_TLS_MIN 12
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#define TARGET_GDT_ENTRY_TLS_MAX 14
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#if 0 // Redefine this
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struct target_modify_ldt_ldt_s {
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unsigned int entry_number;
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abi_ulong base_addr;
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unsigned int limit;
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unsigned int seg_32bit:1;
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unsigned int contents:2;
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unsigned int read_exec_only:1;
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unsigned int limit_in_pages:1;
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unsigned int seg_not_present:1;
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unsigned int useable:1;
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unsigned int lm:1;
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};
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#else
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struct target_modify_ldt_ldt_s {
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unsigned int entry_number;
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abi_ulong base_addr;
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unsigned int limit;
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unsigned int flags;
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};
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#endif
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struct target_ipc64_perm
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{
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int key;
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uint32_t uid;
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uint32_t gid;
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uint32_t cuid;
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uint32_t cgid;
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unsigned short mode;
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unsigned short __pad1;
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unsigned short seq;
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unsigned short __pad2;
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abi_ulong __unused1;
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abi_ulong __unused2;
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};
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struct target_msqid64_ds {
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struct target_ipc64_perm msg_perm;
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unsigned int msg_stime; /* last msgsnd time */
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unsigned int msg_rtime; /* last msgrcv time */
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unsigned int msg_ctime; /* last change time */
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abi_ulong msg_cbytes; /* current number of bytes on queue */
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abi_ulong msg_qnum; /* number of messages in queue */
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abi_ulong msg_qbytes; /* max number of bytes on queue */
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unsigned int msg_lspid; /* pid of last msgsnd */
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unsigned int msg_lrpid; /* last receive pid */
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abi_ulong __unused4;
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abi_ulong __unused5;
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};
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#define UNAME_MACHINE "x86_64"
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#define UNAME_MINIMUM_RELEASE "2.6.32"
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#define TARGET_ARCH_SET_GS 0x1001
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#define TARGET_ARCH_SET_FS 0x1002
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#define TARGET_ARCH_GET_FS 0x1003
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#define TARGET_ARCH_GET_GS 0x1004
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#define TARGET_MINSIGSTKSZ 2048
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#define TARGET_MCL_CURRENT 1
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#define TARGET_MCL_FUTURE 2
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#define TARGET_MCL_ONFAULT 4
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#endif /* X86_64_TARGET_SYSCALL_H */
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