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ARM: kdgb: use <asm/opcodes.h> for data to be assembled as intruction

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The arch_kgdb_breakpoint() function uses an inline assembly directive
to assemble a specific instruction using .word. This means the linker
will not treat is as an instruction, and therefore incorrectly swap
the endian-ness if running BE8.

As noted, this code means that kgdb is really only usable on arm32
kernels, and should be made dependant on not being a thumb2 kernel
until fixed. However this is not something to be added to this patch.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
This commit is contained in:
Ben Dooks 2013-07-25 15:47:40 +01:00
parent 63328070ef
commit 5a8b93fc94
1 changed files with 2 additions and 1 deletions
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3
arch/arm/include/asm/kgdb.h
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@ -11,6 +11,7 @@
#define __ARM_KGDB_H__
#include <linux/ptrace.h>
#include <asm/opcodes.h>
/*
* GDB assumes that we're a user process being debugged, so
@ -41,7 +42,7 @@
static inline void arch_kgdb_breakpoint(void)
{
asm(".word 0xe7ffdeff");
asm(__inst_arm(0xe7ffdeff));
}
extern void kgdb_handle_bus_error(void);