forked from luck/tmp_suning_uos_patched
3c88c692c2
Currently pt_regs on x86_32 has an oddity in that kernel regs (!user_mode(regs)) are short two entries (esp/ss). This means that any code trying to use them (typically: regs->sp) needs to jump through some unfortunate hoops. Change the entry code to fix this up and create a full pt_regs frame. This then simplifies various trampolines in ftrace and kprobes, the stack unwinder, ptrace, kdump and kgdb. Much thanks to Josh for help with the cleanups! Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __X86_KERNEL_KPROBES_COMMON_H
|
|
#define __X86_KERNEL_KPROBES_COMMON_H
|
|
|
|
/* Kprobes and Optprobes common header */
|
|
|
|
#include <asm/asm.h>
|
|
#include <asm/frame.h>
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
#define SAVE_REGS_STRING \
|
|
/* Skip cs, ip, orig_ax. */ \
|
|
" subq $24, %rsp\n" \
|
|
" pushq %rdi\n" \
|
|
" pushq %rsi\n" \
|
|
" pushq %rdx\n" \
|
|
" pushq %rcx\n" \
|
|
" pushq %rax\n" \
|
|
" pushq %r8\n" \
|
|
" pushq %r9\n" \
|
|
" pushq %r10\n" \
|
|
" pushq %r11\n" \
|
|
" pushq %rbx\n" \
|
|
" pushq %rbp\n" \
|
|
" pushq %r12\n" \
|
|
" pushq %r13\n" \
|
|
" pushq %r14\n" \
|
|
" pushq %r15\n" \
|
|
ENCODE_FRAME_POINTER
|
|
|
|
#define RESTORE_REGS_STRING \
|
|
" popq %r15\n" \
|
|
" popq %r14\n" \
|
|
" popq %r13\n" \
|
|
" popq %r12\n" \
|
|
" popq %rbp\n" \
|
|
" popq %rbx\n" \
|
|
" popq %r11\n" \
|
|
" popq %r10\n" \
|
|
" popq %r9\n" \
|
|
" popq %r8\n" \
|
|
" popq %rax\n" \
|
|
" popq %rcx\n" \
|
|
" popq %rdx\n" \
|
|
" popq %rsi\n" \
|
|
" popq %rdi\n" \
|
|
/* Skip orig_ax, ip, cs */ \
|
|
" addq $24, %rsp\n"
|
|
#else
|
|
|
|
#define SAVE_REGS_STRING \
|
|
/* Skip cs, ip, orig_ax and gs. */ \
|
|
" subl $4*4, %esp\n" \
|
|
" pushl %fs\n" \
|
|
" pushl %es\n" \
|
|
" pushl %ds\n" \
|
|
" pushl %eax\n" \
|
|
" pushl %ebp\n" \
|
|
" pushl %edi\n" \
|
|
" pushl %esi\n" \
|
|
" pushl %edx\n" \
|
|
" pushl %ecx\n" \
|
|
" pushl %ebx\n" \
|
|
ENCODE_FRAME_POINTER
|
|
|
|
#define RESTORE_REGS_STRING \
|
|
" popl %ebx\n" \
|
|
" popl %ecx\n" \
|
|
" popl %edx\n" \
|
|
" popl %esi\n" \
|
|
" popl %edi\n" \
|
|
" popl %ebp\n" \
|
|
" popl %eax\n" \
|
|
/* Skip ds, es, fs, gs, orig_ax, ip, and cs. */\
|
|
" addl $7*4, %esp\n"
|
|
#endif
|
|
|
|
/* Ensure if the instruction can be boostable */
|
|
extern int can_boost(struct insn *insn, void *orig_addr);
|
|
/* Recover instruction if given address is probed */
|
|
extern unsigned long recover_probed_instruction(kprobe_opcode_t *buf,
|
|
unsigned long addr);
|
|
/*
|
|
* Copy an instruction and adjust the displacement if the instruction
|
|
* uses the %rip-relative addressing mode.
|
|
*/
|
|
extern int __copy_instruction(u8 *dest, u8 *src, u8 *real, struct insn *insn);
|
|
|
|
/* Generate a relative-jump/call instruction */
|
|
extern void synthesize_reljump(void *dest, void *from, void *to);
|
|
extern void synthesize_relcall(void *dest, void *from, void *to);
|
|
|
|
#ifdef CONFIG_OPTPROBES
|
|
extern int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter);
|
|
extern unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr);
|
|
#else /* !CONFIG_OPTPROBES */
|
|
static inline int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr)
|
|
{
|
|
return addr;
|
|
}
|
|
#endif
|
|
|
|
#endif
|