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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>
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
#ifndef XTENSA_TARGET_SYSCALL_H
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#define XTENSA_TARGET_SYSCALL_H
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#define UNAME_MACHINE "xtensa"
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#define UNAME_MINIMUM_RELEASE "3.19"
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#define TARGET_CLONE_BACKWARDS
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#define MMAP_SHIFT TARGET_PAGE_BITS
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typedef uint32_t xtensa_reg_t;
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typedef struct {
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} xtregs_opt_t; /* TODO */
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struct target_pt_regs {
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xtensa_reg_t pc; /* 4 */
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xtensa_reg_t ps; /* 8 */
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xtensa_reg_t depc; /* 12 */
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xtensa_reg_t exccause; /* 16 */
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xtensa_reg_t excvaddr; /* 20 */
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xtensa_reg_t debugcause; /* 24 */
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xtensa_reg_t wmask; /* 28 */
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xtensa_reg_t lbeg; /* 32 */
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xtensa_reg_t lend; /* 36 */
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xtensa_reg_t lcount; /* 40 */
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xtensa_reg_t sar; /* 44 */
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xtensa_reg_t windowbase; /* 48 */
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xtensa_reg_t windowstart; /* 52 */
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xtensa_reg_t syscall; /* 56 */
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xtensa_reg_t icountlevel; /* 60 */
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xtensa_reg_t scompare1; /* 64 */
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xtensa_reg_t threadptr; /* 68 */
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/* Additional configurable registers that are used by the compiler. */
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xtregs_opt_t xtregs_opt;
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/* Make sure the areg field is 16 bytes aligned. */
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int align[0] __attribute__ ((aligned(16)));
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/* current register frame.
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* Note: The ESF for kernel exceptions ends after 16 registers!
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*/
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xtensa_reg_t areg[16];
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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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#endif
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