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3ae908c99e
Definition of CALLER_ADDR* through __builtin_return_address makes
compiler insert calls to __xtensa_libgcc_window_spill, which in turn
makes fast_syscall_spill_registers syscall that clobbers registers when
called from the kernel mode, leading to invalid opcode exceptions on
return to userspace.
Provide definition for CALLER_ADDR0 as MAKE_PC_FROM_RA(a0, a1) and in
case CONFIG_FRAME_POINTER is enabled extract CALLER_ADDR{1-3} from
stack.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
34 lines
863 B
C
34 lines
863 B
C
/*
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* arch/xtensa/include/asm/ftrace.h
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2013 Tensilica Inc.
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*/
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#ifndef _XTENSA_FTRACE_H
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#define _XTENSA_FTRACE_H
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#include <asm/processor.h>
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#define HAVE_ARCH_CALLER_ADDR
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#define CALLER_ADDR0 ({ unsigned long a0, a1; \
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__asm__ __volatile__ ( \
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"mov %0, a0\n" \
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"mov %1, a1\n" \
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: "=r"(a0), "=r"(a1) : : ); \
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MAKE_PC_FROM_RA(a0, a1); })
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#ifdef CONFIG_FRAME_POINTER
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extern unsigned long return_address(unsigned level);
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#define CALLER_ADDR1 return_address(1)
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#define CALLER_ADDR2 return_address(2)
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#define CALLER_ADDR3 return_address(3)
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#else
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#define CALLER_ADDR1 (0)
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#define CALLER_ADDR2 (0)
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#define CALLER_ADDR3 (0)
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#endif
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#endif /* _XTENSA_FTRACE_H */
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