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sh: Setup the frame register in asm code

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In order to use DWARF unwinder info the frame register has to contain a
valid value. Whilst GCC takes care of this for C code, we have to do it
ourselves for assembly.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Matt Fleming
2009-08-02 22:33:26 +01:00
committed by Paul Mundt
parent bd353861c7
commit 0b930489b8
3 changed files with 14 additions and 0 deletions
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12
arch/sh/include/asm/entry-macros.S
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@@ -108,3 +108,15 @@
#else
# define PREF(x) nop
#endif
/*
* Macro for use within assembly. Because the DWARF unwinder
* needs to use the frame register to unwind the stack, we
* need to setup r14 with the value of the stack pointer as
* the return address is usually on the stack somewhere.
*/
.macro setup_frame_reg
#ifdef CONFIG_DWARF_UNWINDER
mov r15, r14
#endif
.endm