^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * @file backtrace.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * @remark Copyright 2002 OProfile authors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * @remark Read the file COPYING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * @author John Levon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * @author David Smith
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/oprofile.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/unwind.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static struct stack_frame_ia32 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) dump_user_backtrace_32(struct stack_frame_ia32 *head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* Also check accessibility of one struct frame_head beyond: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct stack_frame_ia32 bufhead[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct stack_frame_ia32 *fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) unsigned long bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (bytes != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) oprofile_add_trace(bufhead[0].return_address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /* frame pointers should strictly progress back up the stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * (towards higher addresses) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (head >= fp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct stack_frame_ia32 *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* User process is IA32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (!current || !test_thread_flag(TIF_IA32))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) head = (struct stack_frame_ia32 *) regs->bp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) while (depth-- && head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) head = dump_user_backtrace_32(head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #endif /* CONFIG_COMPAT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* Also check accessibility of one struct frame_head beyond: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct stack_frame bufhead[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) unsigned long bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (bytes != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) oprofile_add_trace(bufhead[0].return_address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /* frame pointers should strictly progress back up the stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * (towards higher addresses) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (head >= bufhead[0].next_frame)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return bufhead[0].next_frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) x86_backtrace(struct pt_regs * const regs, unsigned int depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (!user_mode(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) struct unwind_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (!depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) oprofile_add_trace(regs->ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (!--depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) for (unwind_start(&state, current, regs, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) !unwind_done(&state); unwind_next_frame(&state)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) addr = unwind_get_return_address(&state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (!addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) oprofile_add_trace(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (!--depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (x86_backtrace_32(regs, depth))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) while (depth-- && head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) head = dump_user_backtrace(head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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