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ddabfa5c2e
Generic kernel code implements a weak version of set_orig_insn that
moves cached 'insn' from arch_uprobe to the original code location when
the trap is removed.
MIPS variant used arch_uprobe->orig_inst which was never initialised
properly, so this code only inserted a nop instead of the original
instruction. With that change orig_inst can also be safely removed.
Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Fixes: 40e084a506 ('MIPS: Add uprobes support.')
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14299/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef __ASM_UPROBES_H
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#define __ASM_UPROBES_H
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#include <linux/notifier.h>
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#include <linux/types.h>
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#include <asm/break.h>
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#include <asm/inst.h>
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/*
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* We want this to be defined as union mips_instruction but that makes the
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* generic code blow up.
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*/
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typedef u32 uprobe_opcode_t;
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/*
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* Classic MIPS (note this implementation doesn't consider microMIPS yet)
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* instructions are always 4 bytes but in order to deal with branches and
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* their delay slots, we treat instructions as having 8 bytes maximum.
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*/
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#define MAX_UINSN_BYTES 8
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#define UPROBE_XOL_SLOT_BYTES 128 /* Max. cache line size */
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#define UPROBE_BRK_UPROBE 0x000d000d /* break 13 */
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#define UPROBE_BRK_UPROBE_XOL 0x000e000d /* break 14 */
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#define UPROBE_SWBP_INSN UPROBE_BRK_UPROBE
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#define UPROBE_SWBP_INSN_SIZE 4
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struct arch_uprobe {
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unsigned long resume_epc;
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u32 insn[2];
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u32 ixol[2];
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};
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struct arch_uprobe_task {
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unsigned long saved_trap_nr;
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};
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extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup,
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struct mm_struct *mm, unsigned long addr);
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extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
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extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
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extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
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extern int arch_uprobe_exception_notify(struct notifier_block *self,
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unsigned long val, void *data);
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extern void arch_uprobe_abort_xol(struct arch_uprobe *aup,
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struct pt_regs *regs);
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extern unsigned long arch_uretprobe_hijack_return_addr(
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unsigned long trampoline_vaddr, struct pt_regs *regs);
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#endif /* __ASM_UPROBES_H */
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