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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>
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
#ifndef TILEGX_TARGET_SYSCALL_H
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#define TILEGX_TARGET_SYSCALL_H
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#define UNAME_MACHINE "tilegx"
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#define UNAME_MINIMUM_RELEASE "3.19"
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#define MMAP_SHIFT TARGET_PAGE_BITS
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#define TILEGX_IS_ERRNO(ret) \
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((ret) > 0xfffffffffffff000ULL) /* errno is 0 -- 4096 */
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typedef uint64_t tilegx_reg_t;
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struct target_pt_regs {
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union {
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/* Saved main processor registers; 56..63 are special. */
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tilegx_reg_t regs[56];
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struct {
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tilegx_reg_t __regs[53];
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tilegx_reg_t tp; /* aliases regs[TREG_TP] */
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tilegx_reg_t sp; /* aliases regs[TREG_SP] */
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tilegx_reg_t lr; /* aliases regs[TREG_LR] */
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};
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};
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/* Saved special registers. */
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tilegx_reg_t pc; /* stored in EX_CONTEXT_K_0 */
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tilegx_reg_t ex1; /* stored in EX_CONTEXT_K_1 (PL and ICS bit) */
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tilegx_reg_t faultnum; /* fault number (INT_SWINT_1 for syscall) */
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tilegx_reg_t orig_r0; /* r0 at syscall entry, else zero */
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tilegx_reg_t flags; /* flags (see below) */
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tilegx_reg_t cmpexch; /* value of CMPEXCH_VALUE SPR at interrupt */
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tilegx_reg_t pad[2];
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};
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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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/* For faultnum */
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#define TARGET_INT_SWINT_1 14
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#endif
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