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49db46a67b
Sequences:
pushl_cfi %reg
CFI_REL_OFFSET reg, 0
and:
popl_cfi %reg
CFI_RESTORE reg
happen quite often. This patch adds macros which generate them.
No assembly changes (verified with objdump -dr vmlinux.o).
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1421017655-25561-1-git-send-email-dvlasenk@redhat.com
Link: http://lkml.kernel.org/r/2202eb90f175cf45d1b2d1c64dbb5676a8ad07ad.1424989793.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
75 lines
1.7 KiB
ArmAsm
75 lines
1.7 KiB
ArmAsm
/*
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* Save registers before calling assembly functions. This avoids
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* disturbance of register allocation in some inline assembly constructs.
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* Copyright 2001,2002 by Andi Kleen, SuSE Labs.
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* Added trace_hardirqs callers - Copyright 2007 Steven Rostedt, Red Hat, Inc.
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* Subject to the GNU public license, v.2. No warranty of any kind.
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*/
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#include <linux/linkage.h>
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#include <asm/dwarf2.h>
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#include <asm/calling.h>
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#include <asm/asm.h>
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/* rdi: arg1 ... normal C conventions. rax is saved/restored. */
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.macro THUNK name, func, put_ret_addr_in_rdi=0
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.globl \name
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\name:
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CFI_STARTPROC
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/* this one pushes 9 elems, the next one would be %rIP */
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pushq_cfi_reg rdi
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pushq_cfi_reg rsi
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pushq_cfi_reg rdx
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pushq_cfi_reg rcx
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pushq_cfi_reg rax
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pushq_cfi_reg r8
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pushq_cfi_reg r9
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pushq_cfi_reg r10
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pushq_cfi_reg r11
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.if \put_ret_addr_in_rdi
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/* 9*8(%rsp) is return addr on stack */
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movq_cfi_restore 9*8, rdi
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.endif
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call \func
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jmp restore
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CFI_ENDPROC
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_ASM_NOKPROBE(\name)
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.endm
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#ifdef CONFIG_TRACE_IRQFLAGS
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THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1
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THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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THUNK lockdep_sys_exit_thunk,lockdep_sys_exit
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#endif
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#ifdef CONFIG_PREEMPT
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THUNK ___preempt_schedule, preempt_schedule
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#ifdef CONFIG_CONTEXT_TRACKING
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THUNK ___preempt_schedule_context, preempt_schedule_context
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#endif
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#endif
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#if defined(CONFIG_TRACE_IRQFLAGS) \
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|| defined(CONFIG_DEBUG_LOCK_ALLOC) \
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|| defined(CONFIG_PREEMPT)
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CFI_STARTPROC
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CFI_ADJUST_CFA_OFFSET 9*8
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restore:
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popq_cfi_reg r11
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popq_cfi_reg r10
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popq_cfi_reg r9
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popq_cfi_reg r8
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popq_cfi_reg rax
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popq_cfi_reg rcx
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popq_cfi_reg rdx
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popq_cfi_reg rsi
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popq_cfi_reg rdi
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ret
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CFI_ENDPROC
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_ASM_NOKPROBE(restore)
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#endif
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