^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Kernel and userspace stack tracing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2001 - 2013 Tensilica Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2015 Cadence Design Systems Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/export.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/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #if IS_ENABLED(CONFIG_OPROFILE) || IS_ENABLED(CONFIG_PERF_EVENTS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /* Address of common_exception_return, used to check the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * transition from kernel to user space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) extern int common_exception_return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) void xtensa_backtrace_user(struct pt_regs *regs, unsigned int depth,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int (*ufn)(struct stackframe *frame, void *data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) unsigned long windowstart = regs->windowstart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned long windowbase = regs->windowbase;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) unsigned long a0 = regs->areg[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned long a1 = regs->areg[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) unsigned long pc = regs->pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct stackframe frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (!depth--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) frame.pc = pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) frame.sp = a1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (pc == 0 || pc >= TASK_SIZE || ufn(&frame, data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (IS_ENABLED(CONFIG_USER_ABI_CALL0_ONLY) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) (IS_ENABLED(CONFIG_USER_ABI_CALL0_PROBE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) !(regs->ps & PS_WOE_MASK)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /* Two steps:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * 1. Look through the register window for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * previous PCs in the call trace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * 2. Look on the stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /* Step 1. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /* Rotate WINDOWSTART to move the bit corresponding to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * the current window to the bit #0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) windowstart = (windowstart << WSBITS | windowstart) >> windowbase;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /* Look for bits that are set, they correspond to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * valid windows.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) for (index = WSBITS - 1; (index > 0) && depth; depth--, index--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (windowstart & (1 << index)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* Get the PC from a0 and a1. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) pc = MAKE_PC_FROM_RA(a0, pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /* Read a0 and a1 from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * corresponding position in AREGs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) a0 = regs->areg[index * 4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) a1 = regs->areg[index * 4 + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) frame.pc = pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) frame.sp = a1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (pc == 0 || pc >= TASK_SIZE || ufn(&frame, data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /* Step 2. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /* We are done with the register window, we need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * look through the stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (!depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* Start from the a1 register. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /* a1 = regs->areg[1]; */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) while (a0 != 0 && depth--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) pc = MAKE_PC_FROM_RA(a0, pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* Check if the region is OK to access. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (!access_ok(&SPILL_SLOT(a1, 0), 8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* Copy a1, a0 from user space stack frame. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (__get_user(a0, &SPILL_SLOT(a1, 0)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) __get_user(a1, &SPILL_SLOT(a1, 1)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) frame.pc = pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) frame.sp = a1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (pc == 0 || pc >= TASK_SIZE || ufn(&frame, data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) EXPORT_SYMBOL(xtensa_backtrace_user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) void xtensa_backtrace_kernel(struct pt_regs *regs, unsigned int depth,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int (*kfn)(struct stackframe *frame, void *data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) int (*ufn)(struct stackframe *frame, void *data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) unsigned long pc = regs->depc > VALID_DOUBLE_EXCEPTION_ADDRESS ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) regs->depc : regs->pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) unsigned long sp_start, sp_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) unsigned long a0 = regs->areg[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) unsigned long a1 = regs->areg[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) sp_start = a1 & ~(THREAD_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) sp_end = sp_start + THREAD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /* Spill the register window to the stack first. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) spill_registers();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /* Read the stack frames one by one and create the PC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * from the a0 and a1 registers saved there.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) while (a1 > sp_start && a1 < sp_end && depth--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct stackframe frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) frame.pc = pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) frame.sp = a1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (kernel_text_address(pc) && kfn(&frame, data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (pc == (unsigned long)&common_exception_return) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) regs = (struct pt_regs *)a1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (user_mode(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (ufn == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) xtensa_backtrace_user(regs, depth, ufn, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) a0 = regs->areg[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) a1 = regs->areg[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) sp_start = a1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) pc = MAKE_PC_FROM_RA(a0, pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) a0 = SPILL_SLOT(a1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) a1 = SPILL_SLOT(a1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) EXPORT_SYMBOL(xtensa_backtrace_kernel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) void walk_stackframe(unsigned long *sp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) int (*fn)(struct stackframe *frame, void *data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) unsigned long a0, a1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) unsigned long sp_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) a1 = (unsigned long)sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) sp_end = ALIGN(a1, THREAD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) spill_registers();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) while (a1 < sp_end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct stackframe frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) sp = (unsigned long *)a1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) a0 = SPILL_SLOT(a1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) a1 = SPILL_SLOT(a1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (a1 <= (unsigned long)sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) frame.pc = MAKE_PC_FROM_RA(a0, a1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) frame.sp = a1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (fn(&frame, data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) #ifdef CONFIG_STACKTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) struct stack_trace_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) struct stack_trace *trace;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) unsigned skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static int stack_trace_cb(struct stackframe *frame, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct stack_trace_data *trace_data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) struct stack_trace *trace = trace_data->trace;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (trace_data->skip) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) --trace_data->skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (!kernel_text_address(frame->pc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) trace->entries[trace->nr_entries++] = frame->pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return trace->nr_entries >= trace->max_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) void save_stack_trace_tsk(struct task_struct *task, struct stack_trace *trace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct stack_trace_data trace_data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) .trace = trace,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) .skip = trace->skip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) walk_stackframe(stack_pointer(task), stack_trace_cb, &trace_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) void save_stack_trace(struct stack_trace *trace)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) save_stack_trace_tsk(current, trace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) EXPORT_SYMBOL_GPL(save_stack_trace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) #ifdef CONFIG_FRAME_POINTER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) struct return_addr_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) unsigned skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static int return_address_cb(struct stackframe *frame, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) struct return_addr_data *r = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (r->skip) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) --r->skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (!kernel_text_address(frame->pc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) r->addr = frame->pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * level == 0 is for the return address from the caller of this function,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * not from this function itself.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) unsigned long return_address(unsigned level)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) struct return_addr_data r = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) .skip = level,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) walk_stackframe(stack_pointer(NULL), return_address_cb, &r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) return r.addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) EXPORT_SYMBOL(return_address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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