Commit 768877be authored by Max Filippov's avatar Max Filippov
Browse files

selftests/seccomp: add xtensa support 



Xtensa syscall number can be obtained and changed through the
struct user_pt_regs. Syscall return value register is fixed relatively
to the current register window in the user_pt_regs, so it needs a bit of
special treatment.

Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
parent da94a40f

tools/testing/selftests/seccomp/seccomp_bpf.c

+15 −1
Original line number Diff line number Diff line
@@ -122,6 +122,8 @@ struct seccomp_data { 
#  define __NR_seccomp 358

# elif defined(__s390__)

#  define __NR_seccomp 348

# elif defined(__xtensa__)

#  define __NR_seccomp 337

# else

#  warning "seccomp syscall number unknown for this architecture"

#  define __NR_seccomp 0xffff
@@ -1622,6 +1624,14 @@ TEST_F(TRACE_poke, getpid_runs_normally) 
# define SYSCALL_SYSCALL_NUM regs[4]

# define SYSCALL_RET	regs[2]

# define SYSCALL_NUM_RET_SHARE_REG

#elif defined(__xtensa__)

# define ARCH_REGS	struct user_pt_regs

# define SYSCALL_NUM	syscall

/*

 * On xtensa syscall return value is in the register

 * a2 of the current window which is not fixed.

 */

#define SYSCALL_RET(reg) a[(reg).windowbase * 4 + 2]

#else

# error "Do not know how to find your architecture's registers and syscalls"

#endif
@@ -1693,7 +1703,8 @@ void change_syscall(struct __test_metadata *_metadata, 
	EXPECT_EQ(0, ret) {}



#if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \

	defined(__s390__) || defined(__hppa__) || defined(__riscv)

	defined(__s390__) || defined(__hppa__) || defined(__riscv) || \

	defined(__xtensa__)

	{

		regs.SYSCALL_NUM = syscall;

	}
@@ -1736,6 +1747,9 @@ void change_syscall(struct __test_metadata *_metadata, 
	if (syscall == -1)

#ifdef SYSCALL_NUM_RET_SHARE_REG

		TH_LOG("Can't modify syscall return on this architecture");



#elif defined(__xtensa__)

		regs.SYSCALL_RET(regs) = result;

#else

		regs.SYSCALL_RET = result;

#endif