Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <sys/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <sys/syscall.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <sysdep/tls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #ifndef PTRACE_GET_THREAD_AREA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define PTRACE_GET_THREAD_AREA 25
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #ifndef PTRACE_SET_THREAD_AREA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define PTRACE_SET_THREAD_AREA 26
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /* Checks whether host supports TLS, and sets *tls_min according to the value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * valid on the host.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) void check_host_supports_tls(int *supports_tls, int *tls_min)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	/* Values for x86 and x86_64.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	for (i = 0; i < ARRAY_SIZE(val); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		user_desc_t info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		info.entry_number = val[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		if (syscall(__NR_get_thread_area, &info) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 			*tls_min = val[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 			*supports_tls = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 			if (errno == EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 			else if (errno == ENOSYS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 				*supports_tls = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	*supports_tls = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int os_set_thread_area(user_desc_t *info, int pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		     (unsigned long) info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		ret = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) int os_get_thread_area(user_desc_t *info, int pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		     (unsigned long) info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 		ret = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }