diff options
| author | Masami Hiramatsu <mhiramat@redhat.com> | 2010-02-25 08:34:30 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-02-25 11:49:26 -0500 |
| commit | f007ea2685692bafb386820144cf73a14016fc7c (patch) | |
| tree | 7c0b5bab997c7f273221730686e262cd3f0c1984 /arch/x86/kernel/kprobes.c | |
| parent | 0f94eb634ef7af736dee5639aac1c2fe9635d089 (diff) | |
kprobes/x86: Cleanup save/restore registers
Introduce SAVE/RESOTRE_REGS_STRING for cleanup
kretprobe-trampoline asm code. These macros will be used for
emulating interruption.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Anders Kaseorg <andersk@ksplice.com>
Cc: Tim Abbott <tabbott@ksplice.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Mathieu Desnoyers <compudj@krystal.dyndns.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
LKML-Reference: <20100225133430.6725.83342.stgit@localhost6.localdomain6>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/kprobes.c')
| -rw-r--r-- | arch/x86/kernel/kprobes.c | 128 |
1 files changed, 67 insertions, 61 deletions
diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c index c69bb65006f3..4ae95befd0eb 100644 --- a/arch/x86/kernel/kprobes.c +++ b/arch/x86/kernel/kprobes.c | |||
| @@ -554,6 +554,69 @@ static int __kprobes kprobe_handler(struct pt_regs *regs) | |||
| 554 | return 0; | 554 | return 0; |
| 555 | } | 555 | } |
| 556 | 556 | ||
| 557 | #ifdef CONFIG_X86_64 | ||
| 558 | #define SAVE_REGS_STRING \ | ||
| 559 | /* Skip cs, ip, orig_ax. */ \ | ||
| 560 | " subq $24, %rsp\n" \ | ||
| 561 | " pushq %rdi\n" \ | ||
| 562 | " pushq %rsi\n" \ | ||
| 563 | " pushq %rdx\n" \ | ||
| 564 | " pushq %rcx\n" \ | ||
| 565 | " pushq %rax\n" \ | ||
| 566 | " pushq %r8\n" \ | ||
| 567 | " pushq %r9\n" \ | ||
| 568 | " pushq %r10\n" \ | ||
| 569 | " pushq %r11\n" \ | ||
| 570 | " pushq %rbx\n" \ | ||
| 571 | " pushq %rbp\n" \ | ||
| 572 | " pushq %r12\n" \ | ||
| 573 | " pushq %r13\n" \ | ||
| 574 | " pushq %r14\n" \ | ||
| 575 | " pushq %r15\n" | ||
| 576 | #define RESTORE_REGS_STRING \ | ||
| 577 | " popq %r15\n" \ | ||
| 578 | " popq %r14\n" \ | ||
| 579 | " popq %r13\n" \ | ||
| 580 | " popq %r12\n" \ | ||
| 581 | " popq %rbp\n" \ | ||
| 582 | " popq %rbx\n" \ | ||
| 583 | " popq %r11\n" \ | ||
| 584 | " popq %r10\n" \ | ||
| 585 | " popq %r9\n" \ | ||
| 586 | " popq %r8\n" \ | ||
| 587 | " popq %rax\n" \ | ||
| 588 | " popq %rcx\n" \ | ||
| 589 | " popq %rdx\n" \ | ||
| 590 | " popq %rsi\n" \ | ||
| 591 | " popq %rdi\n" \ | ||
| 592 | /* Skip orig_ax, ip, cs */ \ | ||
| 593 | " addq $24, %rsp\n" | ||
| 594 | #else | ||
| 595 | #define SAVE_REGS_STRING \ | ||
| 596 | /* Skip cs, ip, orig_ax and gs. */ \ | ||
| 597 | " subl $16, %esp\n" \ | ||
| 598 | " pushl %fs\n" \ | ||
| 599 | " pushl %ds\n" \ | ||
| 600 | " pushl %es\n" \ | ||
| 601 | " pushl %eax\n" \ | ||
| 602 | " pushl %ebp\n" \ | ||
| 603 | " pushl %edi\n" \ | ||
| 604 | " pushl %esi\n" \ | ||
| 605 | " pushl %edx\n" \ | ||
| 606 | " pushl %ecx\n" \ | ||
| 607 | " pushl %ebx\n" | ||
| 608 | #define RESTORE_REGS_STRING \ | ||
| 609 | " popl %ebx\n" \ | ||
| 610 | " popl %ecx\n" \ | ||
| 611 | " popl %edx\n" \ | ||
| 612 | " popl %esi\n" \ | ||
| 613 | " popl %edi\n" \ | ||
| 614 | " popl %ebp\n" \ | ||
| 615 | " popl %eax\n" \ | ||
| 616 | /* Skip ds, es, fs, gs, orig_ax, and ip. Note: don't pop cs here*/\ | ||
| 617 | " addl $24, %esp\n" | ||
| 618 | #endif | ||
| 619 | |||
| 557 | /* | 620 | /* |
| 558 | * When a retprobed function returns, this code saves registers and | 621 | * When a retprobed function returns, this code saves registers and |
| 559 | * calls trampoline_handler() runs, which calls the kretprobe's handler. | 622 | * calls trampoline_handler() runs, which calls the kretprobe's handler. |
| @@ -567,65 +630,16 @@ static void __used __kprobes kretprobe_trampoline_holder(void) | |||
| 567 | /* We don't bother saving the ss register */ | 630 | /* We don't bother saving the ss register */ |
| 568 | " pushq %rsp\n" | 631 | " pushq %rsp\n" |
| 569 | " pushfq\n" | 632 | " pushfq\n" |
| 570 | /* | 633 | SAVE_REGS_STRING |
| 571 | * Skip cs, ip, orig_ax. | ||
| 572 | * trampoline_handler() will plug in these values | ||
| 573 | */ | ||
| 574 | " subq $24, %rsp\n" | ||
| 575 | " pushq %rdi\n" | ||
| 576 | " pushq %rsi\n" | ||
| 577 | " pushq %rdx\n" | ||
| 578 | " pushq %rcx\n" | ||
| 579 | " pushq %rax\n" | ||
| 580 | " pushq %r8\n" | ||
| 581 | " pushq %r9\n" | ||
| 582 | " pushq %r10\n" | ||
| 583 | " pushq %r11\n" | ||
| 584 | " pushq %rbx\n" | ||
| 585 | " pushq %rbp\n" | ||
| 586 | " pushq %r12\n" | ||
| 587 | " pushq %r13\n" | ||
| 588 | " pushq %r14\n" | ||
| 589 | " pushq %r15\n" | ||
| 590 | " movq %rsp, %rdi\n" | 634 | " movq %rsp, %rdi\n" |
| 591 | " call trampoline_handler\n" | 635 | " call trampoline_handler\n" |
| 592 | /* Replace saved sp with true return address. */ | 636 | /* Replace saved sp with true return address. */ |
| 593 | " movq %rax, 152(%rsp)\n" | 637 | " movq %rax, 152(%rsp)\n" |
| 594 | " popq %r15\n" | 638 | RESTORE_REGS_STRING |
| 595 | " popq %r14\n" | ||
| 596 | " popq %r13\n" | ||
| 597 | " popq %r12\n" | ||
| 598 | " popq %rbp\n" | ||
| 599 | " popq %rbx\n" | ||
| 600 | " popq %r11\n" | ||
| 601 | " popq %r10\n" | ||
| 602 | " popq %r9\n" | ||
| 603 | " popq %r8\n" | ||
| 604 | " popq %rax\n" | ||
| 605 | " popq %rcx\n" | ||
| 606 | " popq %rdx\n" | ||
| 607 | " popq %rsi\n" | ||
| 608 | " popq %rdi\n" | ||
| 609 | /* Skip orig_ax, ip, cs */ | ||
| 610 | " addq $24, %rsp\n" | ||
| 611 | " popfq\n" | 639 | " popfq\n" |
| 612 | #else | 640 | #else |
| 613 | " pushf\n" | 641 | " pushf\n" |
| 614 | /* | 642 | SAVE_REGS_STRING |
| 615 | * Skip cs, ip, orig_ax and gs. | ||
| 616 | * trampoline_handler() will plug in these values | ||
| 617 | */ | ||
| 618 | " subl $16, %esp\n" | ||
| 619 | " pushl %fs\n" | ||
| 620 | " pushl %es\n" | ||
| 621 | " pushl %ds\n" | ||
| 622 | " pushl %eax\n" | ||
| 623 | " pushl %ebp\n" | ||
| 624 | " pushl %edi\n" | ||
| 625 | " pushl %esi\n" | ||
| 626 | " pushl %edx\n" | ||
| 627 | " pushl %ecx\n" | ||
| 628 | " pushl %ebx\n" | ||
| 629 | " movl %esp, %eax\n" | 643 | " movl %esp, %eax\n" |
| 630 | " call trampoline_handler\n" | 644 | " call trampoline_handler\n" |
| 631 | /* Move flags to cs */ | 645 | /* Move flags to cs */ |
| @@ -633,15 +647,7 @@ static void __used __kprobes kretprobe_trampoline_holder(void) | |||
| 633 | " movl %edx, 52(%esp)\n" | 647 | " movl %edx, 52(%esp)\n" |
| 634 | /* Replace saved flags with true return address. */ | 648 | /* Replace saved flags with true return address. */ |
| 635 | " movl %eax, 56(%esp)\n" | 649 | " movl %eax, 56(%esp)\n" |
| 636 | " popl %ebx\n" | 650 | RESTORE_REGS_STRING |
| 637 | " popl %ecx\n" | ||
| 638 | " popl %edx\n" | ||
| 639 | " popl %esi\n" | ||
| 640 | " popl %edi\n" | ||
| 641 | " popl %ebp\n" | ||
| 642 | " popl %eax\n" | ||
| 643 | /* Skip ds, es, fs, gs, orig_ax and ip */ | ||
| 644 | " addl $24, %esp\n" | ||
| 645 | " popf\n" | 651 | " popf\n" |
| 646 | #endif | 652 | #endif |
| 647 | " ret\n"); | 653 | " ret\n"); |