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| author | Ralf Baechle <ralf@linux-mips.org> | 2015-07-29 22:44:53 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-09-03 12:08:05 +0200 |
| commit | 40e084a506eba78310cd5e8ab700fd1226c6130a (patch) | |
| tree | a7d19eea2c8a72c78205f2403be2ea3cde24ce63 /arch/mips/include/asm/uprobes.h | |
| parent | MIPS: Set trap_no field in thread_struct on exception. (diff) | |
| download | linux-40e084a506eba78310cd5e8ab700fd1226c6130a.tar.xz linux-40e084a506eba78310cd5e8ab700fd1226c6130a.zip | |
MIPS: Add uprobes support.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/uprobes.h')
| -rw-r--r-- | arch/mips/include/asm/uprobes.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/mips/include/asm/uprobes.h b/arch/mips/include/asm/uprobes.h new file mode 100644 index 000000000000..34c325c674c4 --- /dev/null +++ b/arch/mips/include/asm/uprobes.h @@ -0,0 +1,58 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#ifndef __ASM_UPROBES_H +#define __ASM_UPROBES_H + +#include <linux/notifier.h> +#include <linux/types.h> + +#include <asm/break.h> +#include <asm/inst.h> + +/* + * We want this to be defined as union mips_instruction but that makes the + * generic code blow up. + */ +typedef u32 uprobe_opcode_t; + +/* + * Classic MIPS (note this implementation doesn't consider microMIPS yet) + * instructions are always 4 bytes but in order to deal with branches and + * their delay slots, we treat instructions as having 8 bytes maximum. + */ +#define MAX_UINSN_BYTES 8 +#define UPROBE_XOL_SLOT_BYTES 128 /* Max. cache line size */ + +#define UPROBE_BRK_UPROBE 0x000d000d /* break 13 */ +#define UPROBE_BRK_UPROBE_XOL 0x000e000d /* break 14 */ + +#define UPROBE_SWBP_INSN UPROBE_BRK_UPROBE +#define UPROBE_SWBP_INSN_SIZE 4 + +struct arch_uprobe { + unsigned long resume_epc; + u32 insn[2]; + u32 ixol[2]; + union mips_instruction orig_inst[MAX_UINSN_BYTES / 4]; +}; + +struct arch_uprobe_task { + unsigned long saved_trap_nr; +}; + +extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, + struct mm_struct *mm, unsigned long addr); +extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs); +extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs); +extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk); +extern int arch_uprobe_exception_notify(struct notifier_block *self, + unsigned long val, void *data); +extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, + struct pt_regs *regs); +extern unsigned long arch_uretprobe_hijack_return_addr( + unsigned long trampoline_vaddr, struct pt_regs *regs); + +#endif /* __ASM_UPROBES_H */ |