f6dedecc37
This patch implements the oprofile backtrace generation for 32 bit applications running in the 64bit environment (compat mode). With this change it's possible to get backtrace for 32bits applications under the 64bits environment using oprofile's callgraph options. opcontrol --setup -c ... opreport -l -cg ... Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
140 lines
3.1 KiB
C
140 lines
3.1 KiB
C
/**
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* @file backtrace.c
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*
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* @remark Copyright 2002 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon
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* @author David Smith
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*/
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#include <linux/oprofile.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <asm/ptrace.h>
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#include <asm/uaccess.h>
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#include <asm/stacktrace.h>
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#include <linux/compat.h>
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static void backtrace_warning_symbol(void *data, char *msg,
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unsigned long symbol)
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{
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/* Ignore warnings */
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}
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static void backtrace_warning(void *data, char *msg)
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{
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/* Ignore warnings */
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}
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static int backtrace_stack(void *data, char *name)
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{
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/* Yes, we want all stacks */
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return 0;
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}
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static void backtrace_address(void *data, unsigned long addr, int reliable)
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{
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unsigned int *depth = data;
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if ((*depth)--)
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oprofile_add_trace(addr);
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}
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static struct stacktrace_ops backtrace_ops = {
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.warning = backtrace_warning,
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.warning_symbol = backtrace_warning_symbol,
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.stack = backtrace_stack,
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.address = backtrace_address,
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.walk_stack = print_context_stack,
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};
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#ifdef CONFIG_COMPAT
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static struct stack_frame_ia32 *
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dump_user_backtrace_32(struct stack_frame_ia32 *head)
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{
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struct stack_frame_ia32 bufhead[2];
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struct stack_frame_ia32 *fp;
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/* Also check accessibility of one struct frame_head beyond */
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if (!access_ok(VERIFY_READ, head, sizeof(bufhead)))
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return NULL;
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if (__copy_from_user_inatomic(bufhead, head, sizeof(bufhead)))
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return NULL;
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fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
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oprofile_add_trace(bufhead[0].return_address);
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/* frame pointers should strictly progress back up the stack
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* (towards higher addresses) */
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if (head >= fp)
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return NULL;
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return fp;
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}
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static inline int
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x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
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{
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struct stack_frame_ia32 *head;
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/* User process is 32-bit */
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if (!current || !test_thread_flag(TIF_IA32))
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return 0;
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head = (struct stack_frame_ia32 *) regs->bp;
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while (depth-- && head)
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head = dump_user_backtrace_32(head);
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return 1;
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}
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#else
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static inline int
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x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
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{
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return 0;
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}
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#endif /* CONFIG_COMPAT */
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static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
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{
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struct stack_frame bufhead[2];
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/* Also check accessibility of one struct stack_frame beyond */
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if (!access_ok(VERIFY_READ, head, sizeof(bufhead)))
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return NULL;
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if (__copy_from_user_inatomic(bufhead, head, sizeof(bufhead)))
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return NULL;
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oprofile_add_trace(bufhead[0].return_address);
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/* frame pointers should strictly progress back up the stack
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* (towards higher addresses) */
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if (head >= bufhead[0].next_frame)
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return NULL;
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return bufhead[0].next_frame;
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}
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void
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x86_backtrace(struct pt_regs * const regs, unsigned int depth)
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{
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struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
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if (!user_mode_vm(regs)) {
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unsigned long stack = kernel_stack_pointer(regs);
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if (depth)
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dump_trace(NULL, regs, (unsigned long *)stack, 0,
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&backtrace_ops, &depth);
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return;
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}
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if (x86_backtrace_32(regs, depth))
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return;
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while (depth-- && head)
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head = dump_user_backtrace(head);
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}
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