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When userspace is interrupted at the start of a function, before we get a chance to complete the frame, unwind will miss one caller. X86 has a uprobe specific fixup for this, add bits to the generic unwinder to support this. Suggested-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/20251024145156.GM4068168@noisy.programming.kicks-ass.net
75 lines
1.3 KiB
C
75 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _ASM_UPROBES_H
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#define _ASM_UPROBES_H
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/*
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* User-space Probes (UProbes) for x86
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*
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* Copyright (C) IBM Corporation, 2008-2011
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* Authors:
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* Srikar Dronamraju
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* Jim Keniston
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*/
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#include <linux/notifier.h>
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typedef u8 uprobe_opcode_t;
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#define MAX_UINSN_BYTES 16
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#define UPROBE_XOL_SLOT_BYTES 128 /* to keep it cache aligned */
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#define UPROBE_SWBP_INSN 0xcc
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#define UPROBE_SWBP_INSN_SIZE 1
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enum {
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ARCH_UPROBE_FLAG_CAN_OPTIMIZE = 0,
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ARCH_UPROBE_FLAG_OPTIMIZE_FAIL = 1,
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};
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struct uprobe_xol_ops;
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struct arch_uprobe {
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union {
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u8 insn[MAX_UINSN_BYTES];
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u8 ixol[MAX_UINSN_BYTES];
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};
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const struct uprobe_xol_ops *ops;
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union {
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struct {
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s32 offs;
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u8 ilen;
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u8 opc1;
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} branch;
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struct {
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u8 fixups;
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u8 ilen;
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} defparam;
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struct {
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u8 reg_offset; /* to the start of pt_regs */
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u8 ilen;
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} push;
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};
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unsigned long flags;
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};
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struct arch_uprobe_task {
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#ifdef CONFIG_X86_64
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unsigned long saved_scratch_register;
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#endif
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unsigned int saved_trap_nr;
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unsigned int saved_tf;
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};
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#ifdef CONFIG_UPROBES
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extern bool is_uprobe_at_func_entry(struct pt_regs *regs);
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#else
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static bool is_uprobe_at_func_entry(struct pt_regs *regs)
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{
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return false;
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}
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#endif /* CONFIG_UPROBES */
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#endif /* _ASM_UPROBES_H */
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