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yaml --- r: 3870 b: refs/heads/master c: fa0ebff h: refs/heads/master v: v3
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Richard Purdie
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Russell King
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Jun 28, 2005
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: adb2705a89e8b41abcf29c0ed86f4ce93ab36734 | ||
| refs/heads/master: fa0ebff62a8a25952a082641db0ed6b1cfc6c38c |
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Arm specific backtracing code for oprofile | ||
| * | ||
| * Copyright 2005 Openedhand Ltd. | ||
| * | ||
| * Author: Richard Purdie <rpurdie@openedhand.com> | ||
| * | ||
| * Based on i386 oprofile backtrace code by John Levon, David Smith | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| */ | ||
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| #include <linux/oprofile.h> | ||
| #include <linux/sched.h> | ||
| #include <linux/mm.h> | ||
| #include <asm/ptrace.h> | ||
| #include <asm/uaccess.h> | ||
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| /* | ||
| * The registers we're interested in are at the end of the variable | ||
| * length saved register structure. The fp points at the end of this | ||
| * structure so the address of this struct is: | ||
| * (struct frame_tail *)(xxx->fp)-1 | ||
| */ | ||
| struct frame_tail { | ||
| struct frame_tail *fp; | ||
| unsigned long sp; | ||
| unsigned long lr; | ||
| } __attribute__((packed)); | ||
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| #ifdef CONFIG_FRAME_POINTER | ||
| static struct frame_tail* kernel_backtrace(struct frame_tail *tail) | ||
| { | ||
| oprofile_add_trace(tail->lr); | ||
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| /* frame pointers should strictly progress back up the stack | ||
| * (towards higher addresses) */ | ||
| if (tail >= tail->fp) | ||
| return NULL; | ||
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| return tail->fp-1; | ||
| } | ||
| #endif | ||
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| static struct frame_tail* user_backtrace(struct frame_tail *tail) | ||
| { | ||
| struct frame_tail buftail; | ||
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| /* hardware pte might not be valid due to dirty/accessed bit emulation | ||
| * so we use copy_from_user and benefit from exception fixups */ | ||
| if (copy_from_user(&buftail, tail, sizeof(struct frame_tail))) | ||
| return NULL; | ||
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| oprofile_add_trace(buftail.lr); | ||
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| /* frame pointers should strictly progress back up the stack | ||
| * (towards higher addresses) */ | ||
| if (tail >= buftail.fp) | ||
| return NULL; | ||
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| return buftail.fp-1; | ||
| } | ||
|
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| /* Compare two addresses and see if they're on the same page */ | ||
| #define CMP_ADDR_EQUAL(x,y,offset) ((((unsigned long) x) >> PAGE_SHIFT) \ | ||
| == ((((unsigned long) y) + offset) >> PAGE_SHIFT)) | ||
|
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| /* check that the page(s) containing the frame tail are present */ | ||
| static int pages_present(struct frame_tail *tail) | ||
| { | ||
| struct mm_struct * mm = current->mm; | ||
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| if (!check_user_page_readable(mm, (unsigned long)tail)) | ||
| return 0; | ||
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| if (CMP_ADDR_EQUAL(tail, tail, 8)) | ||
| return 1; | ||
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| if (!check_user_page_readable(mm, ((unsigned long)tail) + 8)) | ||
| return 0; | ||
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| return 1; | ||
| } | ||
|
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| /* | ||
| * | | /\ Higher addresses | ||
| * | | | ||
| * --------------- stack base (address of current_thread_info) | ||
| * | thread info | | ||
| * . . | ||
| * | stack | | ||
| * --------------- saved regs->ARM_fp value if valid (frame_tail address) | ||
| * . . | ||
| * --------------- struct pt_regs stored on stack (struct pt_regs *) | ||
| * | | | ||
| * . . | ||
| * | | | ||
| * --------------- %esp | ||
| * | | | ||
| * | | \/ Lower addresses | ||
| * | ||
| * Thus, &pt_regs <-> stack base restricts the valid(ish) fp values | ||
| */ | ||
| static int valid_kernel_stack(struct frame_tail *tail, struct pt_regs *regs) | ||
| { | ||
| unsigned long tailaddr = (unsigned long)tail; | ||
| unsigned long stack = (unsigned long)regs; | ||
| unsigned long stack_base = (stack & ~(THREAD_SIZE - 1)) + THREAD_SIZE; | ||
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| return (tailaddr > stack) && (tailaddr < stack_base); | ||
| } | ||
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| void arm_backtrace(struct pt_regs const *regs, unsigned int depth) | ||
| { | ||
| struct frame_tail *tail; | ||
| unsigned long last_address = 0; | ||
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| tail = ((struct frame_tail *) regs->ARM_fp) - 1; | ||
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| if (!user_mode(regs)) { | ||
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| #ifdef CONFIG_FRAME_POINTER | ||
| while (depth-- && tail && valid_kernel_stack(tail, regs)) { | ||
| tail = kernel_backtrace(tail); | ||
| } | ||
| #endif | ||
| return; | ||
| } | ||
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| while (depth-- && tail && !((unsigned long) tail & 3)) { | ||
| if ((!CMP_ADDR_EQUAL(last_address, tail, 0) | ||
| || !CMP_ADDR_EQUAL(last_address, tail, 8)) | ||
| && !pages_present(tail)) | ||
| return; | ||
| last_address = (unsigned long) tail; | ||
| tail = user_backtrace(tail); | ||
| } | ||
| } | ||
|
|
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