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ARM: hw_breakpoint: add support for multiple watchpoints

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ARM debug architecture 7.1 mandates that the DFAR is updated on a
watchpoint debug exception to contain the faulting virtual address
of the memory access. This allows us to determine which watchpoints
have fired and therefore report useful information to userspace.

This patch adds support for using the DFAR in the watchpoint handler,
which allows us to support multiple watchpoints on CPUs implementing
the new debug architecture.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon
2011-08-02 16:16:57 +01:00
parent c512de955f
commit 6f26aa05c9
2 changed files with 67 additions and 36 deletions
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1
arch/arm/include/asm/hw_breakpoint.h
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@@ -58,6 +58,7 @@ static inline void decode_ctrl_reg(u32 reg,
/* Watchpoints */
#define ARM_BREAKPOINT_LOAD 1
#define ARM_BREAKPOINT_STORE 2
#define ARM_FSR_ACCESS_MASK (1 << 11)
/* Privilege Levels */
#define ARM_BREAKPOINT_PRIV 1