qemu/linux-user/mips/target_syscall.h

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#ifndef MIPS_TARGET_SYSCALL_H
#define MIPS_TARGET_SYSCALL_H
/* this struct defines the way the registers are stored on the
stack during a system call. */
struct target_pt_regs {
/* Pad bytes for argument save space on the stack. */
abi_ulong pad0[6];
/* Saved main processor registers. */
abi_ulong regs[32];
/* Saved special registers. */
abi_ulong cp0_status;
abi_ulong lo;
abi_ulong hi;
abi_ulong cp0_badvaddr;
abi_ulong cp0_cause;
abi_ulong cp0_epc;
};
#define UNAME_MACHINE "mips"
#define UNAME_MINIMUM_RELEASE "2.6.32"
#define TARGET_CLONE_BACKWARDS
linux-user: Add strace support for printing arguments of syscalls used to lock and unlock memory 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>
2020-08-11 19:45:51 +03:00
#define TARGET_MCL_CURRENT 1
#define TARGET_MCL_FUTURE 2
#define TARGET_MCL_ONFAULT 4
#define TARGET_FORCE_SHMLBA
static inline abi_ulong target_shmlba(CPUMIPSState *env)
{
return 0x40000;
}
#endif /* MIPS_TARGET_SYSCALL_H */