forked from luck/tmp_suning_uos_patched
x86/asm: Create stack frames in rwsem functions
rwsem.S has several callable non-leaf functions which don't honor CONFIG_FRAME_POINTER, which can result in bad stack traces. Create stack frames for them when CONFIG_FRAME_POINTER is enabled. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Bernd Petrovitsch <bernd@petrovitsch.priv.at> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Chris J Arges <chris.j.arges@canonical.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michal Marek <mmarek@suse.cz> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Pedro Alves <palves@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/ad0932bbead975b15f9578e4f2cf2ee5961eb840.1453405861.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -15,6 +15,7 @@
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#include <linux/linkage.h>
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#include <asm/alternative-asm.h>
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#include <asm/frame.h>
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#define __ASM_HALF_REG(reg) __ASM_SEL(reg, e##reg)
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#define __ASM_HALF_SIZE(inst) __ASM_SEL(inst##w, inst##l)
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@ -84,24 +85,29 @@
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/* Fix up special calling conventions */
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ENTRY(call_rwsem_down_read_failed)
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FRAME_BEGIN
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save_common_regs
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__ASM_SIZE(push,) %__ASM_REG(dx)
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movq %rax,%rdi
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call rwsem_down_read_failed
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__ASM_SIZE(pop,) %__ASM_REG(dx)
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restore_common_regs
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FRAME_END
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ret
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ENDPROC(call_rwsem_down_read_failed)
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ENTRY(call_rwsem_down_write_failed)
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FRAME_BEGIN
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save_common_regs
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movq %rax,%rdi
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call rwsem_down_write_failed
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restore_common_regs
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FRAME_END
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ret
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ENDPROC(call_rwsem_down_write_failed)
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ENTRY(call_rwsem_wake)
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FRAME_BEGIN
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/* do nothing if still outstanding active readers */
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__ASM_HALF_SIZE(dec) %__ASM_HALF_REG(dx)
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jnz 1f
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@ -109,15 +115,18 @@ ENTRY(call_rwsem_wake)
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movq %rax,%rdi
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call rwsem_wake
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restore_common_regs
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1: ret
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1: FRAME_END
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ret
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ENDPROC(call_rwsem_wake)
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ENTRY(call_rwsem_downgrade_wake)
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FRAME_BEGIN
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save_common_regs
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__ASM_SIZE(push,) %__ASM_REG(dx)
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movq %rax,%rdi
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call rwsem_downgrade_wake
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__ASM_SIZE(pop,) %__ASM_REG(dx)
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restore_common_regs
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FRAME_END
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ret
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ENDPROC(call_rwsem_downgrade_wake)
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